Water Waste Water Treatment

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WATER AND

WASTEWATER

TREATMENT

www.balmoraltanks.com

Rainwater harvesting systems Wastewater treatment plant Technical data Information

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Wastewater treatment plant

3

Septic tanks 9

Balmoral Continuous Aeration Plant (CAP) 15

Balmoral HydroClearTM ₂₁

Balmoral Sequential Batch Reactor (SBR) 29

Balmoral rainwater harvesting systems

37

Home-HarvestTM_{rainwater system} ₄₄

Garden-HarvestTM_{rainwater system} ₄₆

Water storage

49

Above ground water storage 55

Underground water storage 56

Balmoral Hydrostack emergency water storage 57

Balmoral Tanks Ltd

59

Balmoral Group 61

HEAD OFFICE AND FACTORIES

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W ast ew ate r tre atm en tp lan t

Reference should be made to the following guidance notes

• Environment Agency Pollution Prevention Guidelines PPG4

WASTEWATER

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Mains and off-mains drainage

The majority of houses in the UK are linked to the public sewerage system; you pull the plug, flush the toilet, pay the monthly bill and have little more to worry about. This is mains drainage.

In rural areas many homes and villages are self-contained, ie, the wastewater flows to a cesspool, septic tank or treatment plant. This has no connection to the public sewerage system and is known as off-mains.

If you’re off-mains what are your options?

If you seek a solution to your off-mains wastewater disposal, one of the three following options will be required:

Q Septic tank

Q Package wastewater treatment plant

Q Cesspool

Septic tank

Solids and liquids separate in a septic tank with the liquids receiving minimum biological treatment. The liquid in the centre of the tank is discharged via an outlet before passing through a soakaway system which must be installed to national standards.

The solids that gather at the bottom of the tank must be emptied regularly to prevent overflow and potential soakaway damage.

Package wastewater treatment plant

So-called because these products bring together all the requirements to treat wastewater to a high standard within a single pre-fabricated system. Generally consisting of a two or three chamber treatment process, effluent is treated aerobically, ie, using oxygen, to such a standard that it is usually acceptable to discharge directly into watercourse. Package treatment plants require an electrical connection and should be emptied regularly dependent on usage and capacity.

Cesspool

This is a single watertight underground chamber which simply stores raw sewage for collection. Usually constructed in GRP, concrete or brick these can be very large and must be emptied regularly to avoid overflowing.

Unless there is absolutely no other solution - where the ground

Choosing the right sewage

treatment and disposal method for

your site is essential to ensure

value for money, effective

long-term performance, protection of

public health and the environment,

and compliance with relevant

legislation*

Septic tank

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Which one is for you?

Now that you have identified the requirement for a

wastewater treatment system, how do you know which one is correct for your property?

As the final effluent will be discharged into the ground via a soakaway, raised mound, reed bed or watercourse, a full assessment should be undertaken by a qualified engineer. This will normally include geographic research in terms of water table height, a site visit and a percolation test. Combined, these factors will determine the type of system that best meets your criteria.

Contact local Building Control (BC) office and environmental regulator for selection of discharge type1

Public Sewer

discharge Soakaway discharge

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Consent to discharge

Where effluent will be discharged to a watercourse and depending on the volume, consent must be granted by your local environment agency before you begin your installation. If you do not obtain such a “licence” you may be liable to prosecution.

Your agency will be happy to advise you on the level of effluent treatment required in the area and this information will help you determine which type of wastewater treatment plant should be installed. You will then be required to complete and submit a Consent to Discharge application form including a fee to the appropriate agency.

Consent to discharge criteria is normally expressed in permitted milligrams per litre for the following factors:

Q Biochemical Oxygen Demand (BOD)

Q Suspended Solids (SS)

Q Ammonia (NH3)

Confirm acceptance to adopt discharge with local water company provider

Discuss BC approval for septic tank2

discharge through soakaway system (subject to site assessment) Perform site assessment for gravity or pumped discharge to public sewer point Perform site assessment for soakaway suitability, including percolation test

Submit plans with details of proposed system to BC for final approval

Size system for population requirement and submit plans to BC for final approval

Si te un su ita bl e fo rs oa ka w ay

1_{Balmoral Tanks Sales will be able to offer further independent advice where}

multiple options exist

2_{In some circumstances a Package Treatment Plant may be required - select}

Balmoral Hydroclear, CAP or SBR

Pollution of the environment is a

criminal offence and compliance

with one or more Guidance Note is

not a defence to such offences. It

is recommended that you check

the references to other sources of

guidance to ensure they are still

current*

* Source: EA PPG4 Surface/open water discharge Obtain approval from environmental regulator for discharge authorisation -Consent Licence Registration (CLR) Perform site assessment and using CLR, select Balmoral Hydroclear, CAP or SBR to suit effluent quality and population requirement

Submit plans with details of proposed system to BC for final approval

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Will you need planning permission?

You should contact your local authority to determine whether or not planning permission is required before you begin the project. Quite often, in new build situations particularly, this approval will form part of the overall permission but be sure to have this clarified in every case.

Installation

It is recommended that wastewater treatment plants shouldn’t be sited any nearer than 25m from an inhabitated building although some local authorities may allow installation considerably closer. For single house installations 15m is generally considered as a reasonable distance though agreement should always be sought from your local authority before installation.

The plant should not be installed close to a driveway or road or indeed anywhere else where there is a risk of it being

subjected to additional superimposed loadings.

Access should be maintained for the desludging tanker, these can normally achieve a reach of approximately 20m. The installation must be carried out by suitably qualified personnel and special care is required when installing in adverse conditions such rocky substrata or where the water table runs high, for example.

Any proposals for non-mains

sewerage systems must take

account of the requirements of

Building Regulations and should

be discussed with the local

planning authority at an early

stage and well before any

planning application is made*

Sewage treatment is an ongoing

process and the micro-organisms

must stay healthy for the system

to work. You should desludge the

system regularly to prevent the

build up of sludge and solids so

that sewage flows freely through

the unit*

Commissioning, maintenance and

after sales support

We would always recommend that your wastewater treatment plant is commissioned, ie, installation check and initial activation, by a Balmoral approved engineer. We would also recommend that you undertake an annual maintenance programme to ensure your plant continues to operate at its full potential. We will be very happy to help you initiate this, if requested, when your plant is commissioned.

In any case, you should inspect your wastewater plant monthly to ensure the effluent is flowing freely. Desludging intervals are dependent upon the tank’s capacity and further information on this is provided in the product-specific sections.

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Se pti c ta nk s

SEPTIC TANKS

Q Impact resistant body moulded in one-piece polyethylene Q Wide base and lifting eyes

Q Adjustable invert depth

Q Fully sized, two stage separation treatment chambers Q Integral venting pipework

Q Wide range to suit population requirements Q BBA Accredited (Cert. no. 94/3021)

Key benefits

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A septic tank is designed to provide what is known as primary treatment to crude wastewater produced in a normal domestic environment. It retains solids and allows them to settle out, where they can be partially broken down by biological action so that only the remaining liquor is left to flow down the outlet drain. This liquor (normally called effluent) is then

sufficiently treated to soak into the ground in an underground soakaway system.

How does it work?

Balmoral septic tanks are designed in accordance with British Standard Code of Practice BS6297 and are based on a two chamber design (4 and 5) with a long flow path which ensures a high degree of settlement (6), thus providing a low level of suspended solids suitable for discharge (7) into an underground soakaway system.

Design features

Q The tanks have a flat base for stability during transportation and storage prior to installation Q The tanks have Ø50mm moulded-in lifting eyes for

use during handling and installation (To be used only when the tank is empty)

Q The inlet and outlet pipework is specially designed to disperse any noxious or inflammable gases into the atmosphere through the drainage ventilation Q The standard septic tank is designed to cater for drain invert depths of 770mm. The neck can be reduced to suit shallower invert depth

Q The inlet pipe can be rotated by 180° to line up with the drainage lines from almost any direction Q The system of baffles ensure that no crude solids escape into the outlet drain, avoiding premature blocking of the soakaway system

Q A fully lockable pedestrian duty manhole cover is supplied as standard to comply with statutory regulations

Q A safety grille can also be supplied as an optional item to fit across the access shaft as an additional safety feature

Q Balmoral septic tanks are tested and approved by the British Board of Agrément (Cert. no. 94/3021)

4 5 6 7 3 1 2 1 110mm Inlet 2 Rodding access

3 Pedestrian duty manhole cover 4 Settlement chamber 5 Cylindrical baffle 6 Settlement 7 110mm Outlet

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12 Inlet _Outlet Reduced invert cut line Ø760mm Nominal access Ground level Ø1275 Ø1840 24 00 77 0 89 0

BST27

Specifications Population served 1-4 Max hydraulic load(l/day) 800 Organic load(g BOD5/day) n/a

NH3(g/per day) n/a

Total capacity(litres) 2700 Diameter(mm) 1840 Height(mm) 2400 Empty plant weight(kg) 197 Energy usage(kWh/day) 0 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BST27-WLID-NN Accreditation BBA (Cert No. 94/3021) Inlet _Outlet Reduced invert cut line Ø760mm Nominal access Ground level Ø1275 Ø2045 26 40 77 0 89 0

BST38

Specifications Population served 5-10 Max hydraulic load(I/day) 2000 Organic load(g BOD5/day) n/a

NH3(g/day) n/a

Total capacity(litres) 3800 Diameter(mm) 2045 Height(mm) 2640 Empty plant weight(kg) 240 Energy usage(kWh/day) 0 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BST38-WLID-NN Accreditation BBA

(Cert No. 94/3021)

Balmoral septic tanks

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Inlet Outlet Reduced invert cut line Ø760mm Nominal access Ground level Ø1275 Ø2165 27 70 77 0 89 0

BST45

Specifications Population served 11-14 Max hydraulic load(l/day) 2800 Organic load(g BOD5/day) n/a

NH3(g/day) n/a

Total capacity(litres) 4500 Diameter(mm) 2165 Height(mm) 2770 Empty plant weight(kg) 275 Energy usage(kWh/day) 0 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BST45-WLID-NN Accreditation BBA (Cert No. 94/3021) Inlet _Outlet Reduced invert cut line Ø760mm Nominal access Ground level 30 05 77 0 89 0

BST60

Specifications Population served 15-22 Max hydraulic load(I/day) 4400 Organic load(g BOD5/day) n/a

NH3(g/day) n/a

Total capacity(litres) 6000 Diameter(mm) 2365 Height(mm) 3005 Empty plant weight(kg) 335 Energy usage(kWh/day) 0 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BST60-WLID-NN Accreditation BBA

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Ba lm ora lC AP

BALMORAL CAP

Continuous Aeration Plant

Q Impact resistant body moulded in one-piece polyethylene Q Wide base for stability and ease of handling and storage Q Sturdy lifting eyes for easy handling and installation Q Achieves Royal Commission standards for effluent quality

under normal domestic conditions

Q Powered by a small, near silent air compressor Q Corrosion resistant

Q The Balmoral CAP is tested and approved by the Irish Agrément Board (Cert. no. 02/0148)

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The Balmoral CAP is a biological aeration type treatment plant designed to produce a moderate quality of final effluent in addition to overcoming several of the common problems associated with small packaged domestic wastewater treatment units.

Common problems which can occur are:

Q “Fixed film” types, which have a “media” matrix, can suffer from media blockage because of excessive bacteria growth. Replacement/ maintenance of the media material may be required at regular intervals

Q Mechanical/electrical components within the tanks are difficult to maintain and can be a safety risk Q The liquor is not spread evenly over the available

bacteria preventing an adequate oxygen supply

The Balmoral CAP overcomes these problems because:

Q There is no “fixed” media within the CAP to become blocked - it operates on the “activated sludge” principal whereby the bacteria floats in suspension in the reactor vessel and forms an “active soup” of “mixed liquor”

Q All functions within the tank are operated by air power generated by a small compressor contained in the neck of the tank, allowing maintenance to be carried out safely and easily

Q The bacteria receives a high quality air supply and is completely mixed and aerated by the high volume fine bubble diffuser

How does it work?

Crude wastewater enters the main outer chamber (1) where the initial settlement takes place, with the heaviest solids sinking and the floating matter rising. The liquor from the main section is transferred to the central chamber (2) where it is continuously aerated by the fine bubble diffuser (4) which encourages bacteria to provide the second stage of treatment. The mid section of this treated effluent is then removed from the chamber through a calming pipe (5) which allows a further brief settlement before discharge (6).

The air compressor (7) runs continuously. It is contained within the neck of the tank and is accessible for maintenance if required. Easy access is available to both chambers for desludging which is an annual operation.

BALMORAL CAP

Continuous Aeration Plant

4 5 6 7 3 1 2

1 Primary settlement tank 2 Reactor vessel 3 Transfer pipe 4 Fine bubble diffuser 5 Calming pipe 6 Outlet pipe 7 Air compressor

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18 Inlet _Outlet Reduced invert cut line Ø760mm Nominal access Ground level Ø1275 Ø2045 26 40 77 0 89 0

CAP6

_{Specifications} Population served 1-6 Max hydraulic load(l/day) 1200 Organic load(g BOD5/day) 360

NH3(g/per day) 48

Total capacity(litres) 3800 Diameter(mm) 2045 Height(mm) 2640 Empty plant weight(kg) 250 Energy usage(kWh/day) 1.4 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BCAP-6-NN Pump version BCAP-6-NN-WPUMP Accreditation IAB(Cert No. 02/0148)

Inlet Outlet Ø760mm Nominal access Ground level Ø1275 Ø2045 23 70 50 0 62 0

CAP6

NH3(g/per day) 48

Total capacity(litres) 3800 Diameter(mm) 2045 Height(mm) 2370 Empty plant weight(kg) 250 Energy usage(kWh/day) 1.4 Inlet invert(mm) 500 Outlet invert(mm) 620 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BCAP-6-NN-LINV Pump version BCAP-6-NN-WPUMP-LINV Accreditation IAB(Cert No. 02/0148)

Low

invert

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Inlet _Outlet Reduced invert cut line Ø760mm Nominal access Ground level Ø1275 Ø2365 30 05 77 0 89 0

CAP12

NH3(g/per day) 96

Total capacity(litres) 6000 Diameter(mm) 2365 Height(mm) 3005 Empty plant weight(kg) 345 Energy usage(kWh/day) 1.8 Inlet invert(mm) 770 Outlet invert(mm) 890 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BCAP-12-NN Pump version BCAP-12-NN-WPUMP Accreditation IAB(Cert No. 02/0148)

Inlet _Outlet Ø760mm Nominal access Ground level 27 35 50 0 62 0

CAP12

NH3(g/per day) 96

Total capacity(litres) 6000 Diameter(mm) 2365 Height(mm) 2735 Empty plant weight(kg) 345 Energy usage(kWh/day) 1.8 Inlet invert(mm) 500 Outlet invert(mm) 620 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BCAP-12-NN-LINV Pump version BCAP-12-NN-WPUMP-LINV

Low

invert

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Ba lm ora l Hy dro Cle ar_TM

BALMORAL

HYDROCLEAR

Q Market leading pollutant removal level of 97% Q 24 month service period reduces operating costs Q 6-50 pop options

Q Cost effective installation Q Virtually silent operation

Q Carries full CE accreditation to BS EN12566-3

Key benefits

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An aerated biological system, the HydroClear benefits from a moving bed biological reactor, or MBBR, at its core. A new process in the package wastewater market, MBBR technology embraces the benefits of common fixed film media processes without suffering their common downfalls.

Overgrowth of bacteria leading to ‘channelling’ is an issue with common process designs such as submerged aerated filters (SAF), rotating biological contactors (RBC) or trickling filter (TF) designs.

How does it work?

The Balmoral HydroClear system incorporates a full size three chamber design, ie, primary settlement, aeration chamber and final settlement.

Within the primary settlement chamber, large solids are removed by settlement and flotation. An accumulation forms at the base of the tank and is removed annually or biennially by desludging.

The clarified water then passes to the biological reactor where it is treated to remove the dissolved constituents. Mobile media elements support large bacterial

populations within the reaction chamber while induced air promotes complete mixing ensuring that full treatment is achieved.

Unlike conventional media beds, MBBR systems are self cleaning and unable to become blocked through

channelling. Media interactions produce a sloughing effect that removes excess bacteria thus ensuring continuous re-growth, optimising overall reactor efficiency.

Design features

Q Class-leading performance The HydroClear produces an astonishing market leading pollutant removal level of 97%. Carrying full CE accreditation to BS EN12566-3, final values are achieved for BOD, SS and NH4-N of 10:13:6mg/l respectively.

Q Lower operating costs With its unprecedented 24-month service period and enhanced capacities the HydroClear can dramatically reduce long term operating costs. This is achieved through the inherent reliability of the simple but effective design rather than using complex systems that require frequent maintenance and desludging to achieve optimum performance. Q Easy installation Further benefits are realised from the

outset with optimised design characteristics meaning the 6-pop model can be installed using a 2.5-tonne mini-digger rather than the 7 or 12-tonne machines required for traditional plants. These design values are reflected across the entire HydroClear range resulting in simple, cost effective installation with minimal damage to the surrounding area.

Q Power failure default Even if the power fails the HydroClear will continue performing as a septic tank to ensure continued environmental protection.

Q Silence is golden High performance diaphragm blowers are used across the full range of HydroClears providing virtually silent operation.

Q Odour minimisation Hermetically sealed and market leading performance means the HydroClear effectively combats odour production.

BALMORAL HYDROCLEAR

1 110-160mm inlet depending on model

2 Primary settlement chamber 3 Aeration chamber 4 Final settlement chamber 5 110-160mm outlet depending

on model 6 160mm capped lid:

desludge point 7 Electrical isolator switch 8 Air compressor with warning

system (240V)

9 760mm manway lid: bolted down and sealed 10 160mm capped lid: desludge point 11 Bio media 12 Bubble diffuser 2 ₃ 5 1 6 7 8 9 10 11 12 4

TM

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24 Ø760mm Ø760mm Access to air compressor 3400 Max width 1250 24 50 Outlet 10 50 Inlet 10 00 Ground level Specifications Population served 1-6 Max hydraulic load(l/day) 1200 Organic load(g BOD5/day) 360

NH3(g/per day) 48

Total capacity(litres) 4440 Length(mm) 3400 Width(mm) 1250 Height(mm) 2450 Empty plant weight(kg) 450

Energy usage(kWh/day) 1.8 Inlet invert(mm) 1000 Outlet invert(mm) 1050 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BHYD-6 Accreditation CE(BS EN 12566-3)

HC

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4500 Max width 1400 Ø760mm Ø760mm 24 50 Desludging point (160mm) Desludging point (160mm) Inlet 10 00 Ground level Outlet 10 50 Access to air compressor Specifications Population served 7-12 Max hydraulic load(l/day) 2400 Organic load(g BOD5/day) 720

NH3(g/per day) 96

HC

12

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5680 Max width 1400 Ø760mm Ø760mm 24 50 Desludging point (160mm) Desludging point (160mm) Inlet 10 00 Ground level Outlet 10 50 Access to air compressor Specifications Population served 13-20 Max hydraulic load(l/day) 4000 Organic load(g BOD5/day) 1200

NH3(g/per day) 160

HC

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4500 600 min distance between tanks

9600 min overall length

24 50 Desludging point (160mm) Desludging point (160mm) Inlet 10 00 Ground level 10 50 4500 Max width 1400 Ø760mm Ø760mm

Primary tank Aeration/final settlement tank

Desludging point (160mm) Rodding point Outlet 10 50 Access to air compressor Specifications Population served 21-30 Max hydraulic load(l/day) 6000 Organic load(g BOD5/day) 1800

NH3(g/per day) 240

Total capacity(litres) 11410

Overall length(mm) 9600 (minimum) Width(mm) 1400

Height(mm) 2450

HC

30

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26 4500 600 min distance between tanks Max width 1400 24 50 Desludging point (160mm) Desludging point (160mm) Desludging point(160mm) Inlet 10 00 Ground level 10 50 10 50 Ø760mm Ø760mm Primary tank 5680 10780 min overall length

Aeration/final settlement tank

Rodding point Access to air compressor Outlet Specifications Population served 31-40 Max hydraulic load(l/day) 8000 Organic load(g BOD5/day) 2400

NH3(g/per day) 320

Height(mm) 2450 Empty plant weight(kg) 1190

HC

40

5680 600 min distance between tanks Max width 1400 24 50 Desludging point (160mm) Desludging point (160mm) Desludging point (160mm) Inlet _Outlet 10 00 Ground level 10 50 10 50 Ø760mm Ø760mm Ø760mm Primary tank 4500 14780 min overall length

Aeration tank Final settlement tank

600 min distance between

tanks 3400

Rodding point Rodding point

Access to air compressor 10 50 Specifications Population served 41-50 Max hydraulic load(l/day) 10000 Organic load(g BOD5/day) 3000

NH3(g/per day) 400

HC

50

Balmoral HydroClear

TM

Note: The HC40 can be installed in line or side by side as conditions dictate

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Desludging intervals

A number of products on the market state 12-month desludging intervals, similar to the HydroClear 6-pop. However, the primary settlement capacities of some of these products could be smaller than the HC6 by as much as 66%. Unless accounted for by special process design this can result in desludging being required three times more frequently than the HydroClear. Similar circumstances may also be found in ranges above 6 pop.

Using the Balmoral sludge gauge, end-users can accurately measure sludge build up. Where reduced loadings exist, the HydroClear can operate safely with longer desludging intervals in comparison to similar sized products.

Servicing

The Balmoral HydroClear has been specifically designed to operate round a 24-month service interval; one of the longest available in the market.

The simplicity of the system also gives the end-user an option to service their plant using accredited engineers or perform a self service using Balmoral supplied kits. Either choice means paying less in service costs over the product’s lifetime.

Operating cost calculator

Visit balmoralhydroclear.com to compare the life cycle costs of alternative products with the Balmoral HydroClear.

Balmoral HydroClear 6-pop

Comparable treatment plant

10 year maintenance costs

End of year one £ £

Two-yearly service by owner NR 200 Annual engineer service Two-yearly desludge NR 200 Annual desludge Total first year cost 0 400 Total first year cost

End of year two

Two-yearly service by owner (service kit) 50 200 Annual engineer service Two-yearly desludge 200 200 Annual desludge

Cumulative two year costs 250 800 Cumulative two year costs

End of year three

Two-yearly service by owner 0 200 Annual engineer service Two-yearly desludge 0 200 Annual desludge

Cumulative three year costs 250 1200 Cumulative three year costs

End of year four

Two-yearly service by owner 50 200 Annual engineer service Two-yearly desludge 200 200 Annual desludge

Cumulative four year costs 500 1600 Cumulative four year costs Cumulative six year costs 750 2400 Cumulative six year costs Cumulative eight year costs 1000 3200 Cumulative eight year costs

Cumulative ten year costs 1250 4000 Cumulative ten year costs

4,000 3,500 3,000 2,500 2,000 1,500 1,000 500 Cu m ul at iv e se rv ic in g co st s( £)

Life cycle costs: HydroClear v Comparable treatment plant

Balmoral HydroClear

Compara

bletrea

tment p

lant

It has been assumed that the desludge interval for the HydroClear will be twice as long as the comparable product and

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Ba lm ora lS BR

BALMORAL SBR

Sequential Batch Reactor

Q Controlled batching of water treatment provides unrivalled effluent quality

Q Bespoke designs available to meet specific flow and load requirements

Q Completely separate control kiosk houses a modern PLC control system

Q No high voltage electrics within the tanks providing a safe design Q Internal venting pipework

Q Tested and approved by the BBA (Cert. no. 01/3786) and Irish Agrément Board (Cert. no. 02/0150)

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The Balmoral Sequential Batch Reactor (SBR) combines the efficiency of activated sludge aeration with batch treatment to provide exceptional effluent quality even under extreme loadings.

In common with all Balmoral products, no compromise is made with regard to quality or design and the advanced technology and materials used in the manufacture of the SBR will ensure a lifetime of reliable service with the very minimum of maintenance. The Balmoral SBR has been designed and built by Balmoral Tanks in association with the University of Abertay, Dundee, Waste Water Technology Centre, who acted as external consultants. The university carried out an in-depth test programme during which the SBR was tested and evaluated alongside a leading competitors model.

The aim of the development programme was to design a unit which was not only very robust and reliable but which would provide outstanding effluent quality without the need for expensive “add on” equipment and would also overcome technical problems - (such as peak surges through the bio-zone), which most current designs have failed to adequately address. The final report from the WWTC confirms that the Balmoral SBR out-performs its rivals in almost every respect and that it has the capability to meet even the most onerous effluent requirement.

How does it work?

Crude wastewater enters the Primary Settlement Tank (PST) (2) where gross solids settle out and the supernatant liquor remaining near the surface can be drawn off. Substantial “buffer” storage volume is provided in the PST to cope with even the most extreme peak flow loadings (3).

A set volume (or batch) of the liquor is transferred to the Reactor Vessel (RV) by an “air-lift” pump (4) where it is mixed and aerated by a powerful air bubble diffuser (5) for a period of 4 hours. During this aeration cycle efficient oxygen transfer cultures a dense “soup” of bacteria (the active sludge) which feeds on the sewage liquor thereby removing most of the organic pollutants. After aeration, the bubble diffuser is switched off and there is a settling period during which the dense activated sludge sinks to the bottom of the RV leaving behind the clarified effluent, (7) which is then discharged into the drain by a second “air-lift” pump (9).

All functions within the tanks are operated by air

BALMORAL SBR

Sequential Batch Reactor

1 110-160mm inlet depending on model 2 Primary settlement chamber 3 Buffer storage of 2/3 daily flow 4 Air lift pump

5 Bubble diffuser 6 Activated sludge storage 7 Clarified effluent

8 Batch cycle volume of 1/3 daily flow 9 Second air lift pump

10 110-160mm outlet depending on model 11 Desludge point

12 600mm manway lid: bolted down and sealed

Design features

Q Unrivalled effluent quality

Q Reduces main pollutants including ammonia by 96% Q Batching system eliminates peak surges

Q Controlled by an integrated programmable control unit Q Automatic “holiday mode” aeration cycle

Q Powered by an air compressor

Q Safe - no 240 volt electrics within tanks

Q Very robust - one piece moulded polyethylene body Q Reliable - all components easily accessible

2 3 5 1 6 7 10 9 12 8 11

Settled sludge level Minimum level

Maximum level Fill

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32 Inlet _Outlet Ø760mm Control kiosk Service duct (Ø110mm) Ground level Ø1275 Ø2045 30 05 11 30 12 40 Desludging point 62 0

SBR6

NH3(g/per day) 48

Total capacity(litres) 3800 Diameter(mm) 2045 Height(mm) 3005 Empty plant weight(kg) 352 Energy usage(kWh/day) 2.16 Inlet invert(mm) 1130 Outlet invert(mm) 1240 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BSBR6

Accreditation BBA(Cert No. 01/3786)

IAB(Cert No. 02/0150)

Inlet _Outlet Ø760mm Control kiosk Service duct (Ø110mm) Ground level Ø1275 Ø2365 31 75 97 5 10 85 Desludging point 62 0

SBR12

NH3(g/per day) 96

Total capacity(litres) 6000 Diameter(mm) 2365 Height(mm) 3175 Empty plant weight(kg) 439 Energy usage(kWh/day) 2.16 Inlet invert(mm) 975 Outlet invert(mm) 1085 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 12 months Product code BSBR12

Balmoral Sequential Batch Reactor

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Inlet

Ø760mm Control

kiosk

Rodding point Rodding point Ø760mm

Ground level Ø1275 300 Ø2365 37 Ø1275 Ø2365 30 05 93 2 Outlet

97

7

Fall between tanks approx 1 in 40mm

Specifications

Population served 13-18 Max hydraulic load(l/day) 3600 Organic load(g BOD5/day) 1080

NH3(g/per day) 144

Overall length(mm) 5030 (minimum) Width(mm) Ø2365

Energy usage(kWh/day) 13.3 Inlet invert(mm) 932 Outlet invert(mm) 977 Pipework fitting(mm) Ø110 Lid size(mm) Ø760 Desludging interval 6 months Product code BSBR18

SB

R1

8

Inlet Ø760mm Control kiosk

Rodding point Rodding point Ø760mm

Ground level Ø1275 300 Ø2365 37 Ø1275 Ø2365 30 05 93 2 Outlet

97

7

Fall between tanks approx 1 in 40mm

Specifications

Population served 19-24 Max hydraulic load(l/day) 4800 Organic load(g BOD5/day) 1440

NH3(g/per day) 192

Height(mm) 3005

SB

R2

4

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Rodding point Rodding point Ø760mm Ground level 370 275 Ø1275 Ø2365 3050 Outlet Inlet

97

7

Control kiosk

Fall between tanks approx 1 in 40mm 28 24 30 05 89 8 Pedestrian duty manhole cover 34 Specifications Population served 24-36 Max hydraulic load(l/day) 7200 Organic load(g BOD5/day) 2160

NH3(g/per day) 288

SB

R3

6

Rodding point

Pedestrian duty

manhole cover Pedestrian dutymanhole cover

Ground level

303

59 3050

Control kiosk Fall between tanks approx 1 in 40mm 28 24 92 1 10 30 Rodding point 3050 Inlet _Outlet Specifications Population served 37-48 Max hydraulic load(l/day) 9600 Organic load(g BOD5/day) 2880

NH3(g/per day) 384

SB

R4

8

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SBR+

Balmoral Tanks also designs and manufactures wastewater treatment plants for larger commercial and domestic applications. Please contact Balmoral Tanks to discuss your project requirements.

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Ba lm ora lra in w ate r ha rv est in g sy ste m s

BALMORAL

RAINWATER

HARVESTING

SYSTEMS

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Harvest around 50% of your water needs

The chart above shows the breakdown of water use in a typical household.

The Balmoral Home-Harvest and Garden-Harvest rainwater systems make it easy for you to gather and reuse this rainwater.

Save on your water costs

By recycling your rainwater, a Balmoral rainwater harvesting system can help save up to 50% of your metered water costs. Meters are provided free of charge from most water

companies so the sooner you fit a Balmoral system the sooner you start saving.

Balmoral rainwater harvesting systems

Balmoral rainwater harvesting systems reduce the demand for mains water provision. Many springs and rivers are naturally fed by groundwater and are important for wetlands and their ecosystems. More than 25% of groundwater sources are at risk because of abstraction pressures.

By gathering and recycling rainwater, Balmoral’s harvesting systems reduce the volume of discharged rainwater and contribute to reduced flood risks. The loading on combined sewer overflows is also lowered resulting in improved river water quality.

Balmoral offers two kinds of rainwater harvesting tanks for home and garden purposes:

Balmoral Home-Harvest Rainwater SystemTM_{- page 44}

Designed for easy installation and reliable operation, each system provides the highest quality non-potable rainwater for toilet flushing, washing machines, garden irrigation and vehicle washing purposes.

Balmoral Garden-Harvest Rainwater SystemTM_{- page 46}

An easy to install, high performance and economic solution for the keen gardener providing free water, even during hosepipe bans, all year round.

Personal washing 33.3% Dishwashing 7.7% Direct heating systems 0.1%

Toilets 33.3% (harvestable) Gardens 6.1% (harvestable) Clothes washing 14% (harvestable) Car washing 0.7% (harvestable)

Miscellaneous 13.1% Gardens 6.1% (harvestable) Toilets 33.3% (harvestable) Car washing 0.7% (harvestable) Clothes washing 14% (harvestable) Total 45.8% harvestable Source: Environment Agency

Balmoral Home-Harvest Rainwater SystemTM

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40

What size of tank do you need?

The size of a rainwater holding tank must match the demand for water with its availability as closely as possible. The tank size chosen must be a balance between budget, storage capacity and the need to enable an overflow at least twice a year to flush out floating debris. The Environment Agency publication ‘Harvesting rainwater for domestic uses: an information guide’ provides an authoritative and independent means of calculating the optimum size of tank for household water use and suggests that 5% of the annual rainwater supply, or of the annual rainwater demand, is used to determine the optimum size of tank, using the lower figure of the two.

What is your annual rainwater supply?

Tank size (litres) = Catchment area m2 _{x Drainage coefficient x Filter efficiency x Annual rainfall mm x 5%}

Example 130m2 _x _0.8 _x _0.9 _x _1125mm _{x 5%}

= 5,265 litres

Annual rainfall

This can vary dramatically over a relatively small area, so a reading (in mm) within 10 miles of the property is preferable. The local Environment Agency or the Met Office can supply rainfall data or you can use the regional guide figures we have provided in the table below. In the ‘annual rainwater supply example’ above we have used the average figure for the UK.

Region Average rainfall (mm)

UK 1125 S England 781 N England 944 Wales 1433 Scotland 1520 NI 1111

EIRE E 875 (Source: Irish Met service) EIRE W 1125

5% is a constant percentage factor Catchment area

Is the width and length of your roof in m2_{. Remember}

you do not have to collect water from the entire roof. This can help to reduce installation costs.

Drainage coefficient

It is difficult to collect every drop of rain that falls on your roof. Light rainfall will only wet your roof and then evaporate and heavy rainfall can overflow gutters. A drainage coefficient is used to adjust the tank size calculation to allow for this.

Roof type Drainage coefficient

Pitched roof tiles 0.75-0.9 Flat roof smooth tiles 0.5 Flat roof with gravel layer 0.4

Filter efficiency

During initial rainfall some rainwater will skim over the filter, clearing away any debris. During heavy flow some rainfall will also bypass the filter to overflow ensuring that the filter is not overloaded. 90% of rainfall is caught, therefore the Balmoral filter coefficient is 0.9.

Average usage

On average, each person in the UK uses around 150 litres of water every day and 45.8% of this total could be rainwater instead of mains water.

What is your annual rainwater demand?

Tank size (litres) = Average usage x people in household x days/year x % harvestable x 5%

Example = 150 litres x 4 x 365 x 45.8% x 5%

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Rainwater supply

What is the right tank for you?

Balmoral produces four tanks for domestic use so all you need to do is select the tank that best suits your needs. To help you we have calculated the correct size of tank for you based on your annual rainwater supply and your annual rainwater demand. Select the tank size from either table and if they indicate different tank sizes then you should choose the smaller of the two. These tables have been produced using the average annual rainfall for the region and assumes a pitched roof with a conservative drainage coefficient of 0.8. If your roof area is beyond the capacity of our largest tank or if the number of people indicates a smaller tank than your roof area will collect, then this is acceptable as it will mean that the tank will overflow more often, flushing out any floating debris.

Tank size calculator

Calculate the size of tank required using the ‘Rainwater supply’ and ‘Rainwater demand’ tables below then select the smaller of the two tank sizes.

Roof size m2 Region 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 South England North England Wales Scotland Northern Ireland ROI East ROI West BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 BS T-27 BS T-38 BS T-45 BS T-60 Number of people Region 1 2 3 4 5 6+ Tank T-27 T-38 T-60 Rainwater demand

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42

The ultimate underground

rainwater harvesting tank

Balmoral rainwater tanks are produced in four sizes, ie, 2728, 3800, 4546 and 6000 litres, and are rotationally moulded in tough polyethylene which offers a very high level of impact resistance.

Design features

Q High impact strength at low temperatures

Q Stress free mouldings provides extra strength

Q Leak proof, single piece moulding

Q Lightweight, easy to handle

Q Corrosion resistant

Q Low maintenance

Q UV protected

Q Recyclable

By recycling your rainwater,

a Balmoral rainwater

harvesting system can help

save up to 50% of your

metered water costs

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How does it work?

Home-Harvest system

Please read in conjunction with the illustration on page 44.

A wall-mounted pump (1) draws water from the system to provide clean water for refilling a toilet cistern or for using with a washing machine. The guided suction line (4) allows the pump to provide the cleanest possible water from the tank.

Garden-Harvest system

Please read in conjunction with the illustrations on page 46.

A submersible pump (1) mounted within the rainwater harvesting system is connected to a garden water tap. A timer switch (6) allows the user to set specific periods of use. When this period expires the pump will switch off automatically.

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44

Balmoral

Home-Harvest

Rainwater System

TM

Pump control unit

Located inside the house Easy access to all electro-mechanical parts No pump in the tank Simpler installation

Auto mains water backup No loss of service. Does not refill tank from mains so less pipework and wasted water Fully insulated cover Quiet operation

10 litre break tank with air gap Meets water regulations

Filter assembly

Lift out 0.2mm stainless steel filter Improved water quality Self cleaning filter Low maintenance

Located within tank Saves space. Easier installation and access Overflow skimmer with U-bend overflow Improved water quality

90% water yield Saves more water

Calmed inlet

Minimises disturbance of settled matter Improved water quality

Guided suction pipe

Unique precision guided system Improved water quality ensures that water is taken only

from the cleanest part of the tank

Additional filter on suction inlet Improved water quality Precisely locates the tank Minimises wasted water low level sensor

Telescopic turret

Adjustable height Minimises installation depth.

Allows a neat flush finish with the ground

1 2 3 4 5 1 2 4 5 3 2 5 1 4 C B A E C

D 1 Pump control unit_{2 Filter assembly}

3 Calmed inlet 4 Guided suction pipe 5 Telescopic turret A Mains bypass connection B Appliance connection C Suction line

D Inlet E Inlet overflow External pipework A, B, C, D and E are not supplied as part of the tank package

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Inlet Inlet overflow Reduced invert cut line Ø760mm Ground level Footprint Ø Diameter Ø H ei gh t

Guided suction intake c/w one-way valve and filter

Minimum water level sensor controls

automatic mains back-up Calmed inlet

Filter assembly

84

0

90

0

Balmoral Home-Harvest Rainwater Tank

Specifications BST-27-HH BST-38-HH BST-45-HH BST-60-HH Population served 1 2 3 4+ Capacity(litres) 2700 3800 4546 6000 Diameter(mm) Ø1840 Ø2045 Ø2165 Ø2365 Height(mm) 2400 2640 2770 3005 Footprint(mm) Ø1275 Ø1275 Ø1275 Ø1275

Empty plant weight(kg) 190 230 260 310

Energy usage*(kWh/day) 0.25 0.25 0.25 0.25

Inlet invert(mm) 840 840 840 840

Inlet overflow(mm) 900 900 900 900

Pipework fitting(mm) Ø110 Ø110 Ø110 Ø110

Lid size(mm) Ø760 Ø760 Ø760 Ø760

Filter checking interval 2 months 2 months 2 months 2 months Product code BST-27-HH BST-38-HH BST-45-HH BST-60-HH

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46

Balmoral

Garden-Harvest

Rainwater System

TM

Submersible pump

Pump located in tank Self contained easy installation High power pump High flow over long hose length Remote On/Off switch Convenient and simple operation

Filter assembly

Lift out 0.2mm stainless steel filter Improved water quality Self cleaning filter Low maintenance

Located within tank Saves space. Easier installation and access Overflow skimmer with U-bend overflow Improved water quality

90% water yield Saves more water

Calmed inlet

Minimises disturbance of settled matter Improved water quality

Telescopic turret

Adjustable height Minimises installation depth.

Allows a neat flush finish with the ground

1 2 3 4 1 2 4 3 2 5 1 4 C B A 6 1 Submersible pump 2 Filter assembly 3 Calmed inlet 4 Guided suction pipe 5 Telescopic turret 6 IP rated switch A Mains bypass connection B Appliance connection C Suction line

External pipework A, B and C are not supplied as part of the tank package

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Inlet Inlet overflow Reduced invert cut line Ø760mm Ground level Footprint Ø Diameter Ø H ei gh t 1 ” delivery hose Stainless steel submersible pump

c/w float valve Calmed inlet

Filter assembly 84 0 90 0 1 4

Balmoral Garden-Harvest Rainwater Tank

Specifications BST-27-GH BST-38-GH BST-45-GH BST-60-GH Population served 1 2 3 4+ Capacity(litres) 2700 3800 4546 6000 Diameter(mm) Ø1840 Ø2045 Ø2165 Ø2365 Height(mm) 2400 2640 2770 3005 Footprint(mm) Ø1275 Ø1275 Ø1275 Ø1275

Empty plant weight(kg) 180 220 250 300

Energy usage*(kWh/day) 1 1 1 1

Inlet invert(mm) 840 840 840 840

Inlet overflow(mm) 900 900 900 900

Pipework fitting(mm) Ø110 Ø110 Ø110 Ø110

Lid size(mm) Ø760 Ø760 Ø760 Ø760

Filter checking interval 12 months 12 months 12 months 12 months Product code BST-27-GH BST-38-GH BST-45-GH BST-60-GH

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W ate r sto ra ge

WATER STORAGE

Reference should be made to the following

• WRAS Water Regulations Guide ISBN 0-9539708-0-9

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Potable and non-potable

water storage tanks

Balmoral’s rotationally moulded water tanks comply fully with United Kingdom water regulations.

The tanks are suitable for many applications and are provided with moulded-in areas for different types of fittings to be attached as required. The above ground tanks can be used for mains supplied potable water. The underground models should only be specified for non-mains supplied water or indirect mains supplied water.

Tank features

Q Suitable for agricultural, commercial and domestic use Q 500mm diameter access points

Q Moulded in features to accept inlets, volume indicators, etc Q UV stabilised material

Q Corrosion resistant

Q Lightweight, one-piece construction

Domestic water storage

To reduce the risk of water contamination in domestic situations, Balmoral water tanks must be installed in accordance with UK water regulations with particular reference being paid to Water Regulations Advisory Scheme (WRAS) Water Regulations Guide.

For private water supplies, advice should be sought from the relevant authority on the correct type of installation should the water supply be subject to local controls.

Installation of a Balmoral water storage tank for domestic purposes must follow WRAS guidelines to reduce the risk of water contamination and provide a hygienic water supply. This may require additional fittings (see page 52) conforming to Schedule 2, section 7, paragraph 16 of the WRAS Water Regulations Guide (previously referred to as Byelaw 30 and Byelaw 60).

These additional fittings should only be fitted when tanks are for indoor use. If in doubt, refer to WRAS Water Regulations Guide or contact your local authority.

Underground water storage Above ground water storage

Agricultural and commercial

water storage

Balmoral water storage tanks are widely used in the agricultural and commercial sectors as a cost-effective solution for mains supplied and non-mains supplied water storage. Typical uses for water storage tanks in these sectors include rainwater harvesting, fire-fighting systems, cleaning systems, water bowsers, sanitation and domestic facilities.

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52

Balmoral G16.13 kit

A Balmoral water storage tank G16.13 kit contains the following items:

Tank fittings for up to 1” inlet

a 3/4” warning pipe b 1 1/2” screened breather c 2” overflow d 2” tank connector • Instruction leaflet or

Tank fittings for over 1” inlet

a 3/4” warning pipe b 1 1/2” screened breather c 2 x 2” overflows d 2 x 2” tank connectors • Instruction leaflet

UK water regulations

Water regulations, “The Water Supply (Water Fittings) Regulations 1999” in England and Wales and “The Water Byelaws 2000, Scotland”, replaced the previous regional Water Byelaws which were seen to be outmoded, restrictive and out of step with the rest of the world in terms of water

management and health and safety.

Fundamentally, the Water Byelaws 2000, Scotland, mirror the regulations adopted for England and Wales as do those which apply in Northern Ireland.

To assist in a greater understanding of the regulations, the Water Regulations Advisory Scheme (WRAS) published its Water Regulations Guide early in 2001.

Guidance summary

The following guidance is a summary aimed at providing an initial assessment of the contamination risk and the design measures required to remain regulation compliant. At the outset the water suppliers’ consent must be obtained before work starts on any proposed installation. Failure to do so could result in criminal prosecution.

The regulations classify water quality into five categories. They range from Fluid Category 1, classed as “wholesome” water (straight from the tap as supplied by the water undertaker) to Fluid Category 5, fluid representing a serious health hazard (grey water recycling cisterns, abattoir supplies, etc).

Under the old Byelaws classification, Fluid Category 1 was termed “water for domestic purposes” or “potable water”. With five Fluid Categories the appropriate safeguards to be selected for a given application may seem a bit daunting, however the Information and Guidance Note document (IGN No. 9-04-04) entitled “Cold Water Storage Cisterns – Design Recommendations for Mains Supply Inlets” acts as a quick guide to simplify the choices.

Inlet level (Inlet not supplied)

a warning pipe c/d overflow level

b breather

Inlet level (Inlet not supplied)

a warning pipe c/d overflow level b breather

Location of G16.13 kit

Horizontal tank Vertical tank

Optional fittings

a 3/4” Warning pipe breather

b 1 1/2” screened breather

c 2” overflow

d 2” tank connector

Any cold water storage cistern or tank together with its fittings requires to be constructed of materials conforming to regulation requirements. Balmoral tanks are compliant with the WRAS Regulator’s Performance Specifications.

Certain basic design parameters are applicable:

a The overflow pipe, inclusive of any insect screen, if fitted, shall be capable of draining the maximum inlet flow without compromising the inlet air gap

b For cisterns of less than 1000 litres actual capacity the overflow/warning pipe diameter shall not be less than 19mm and to ensure air gap compliance is recommended to be sized at twice the diameter of the inlet pipe.

Cisterns greater than 1000 litres actual capacity require both an overflow and a warning pipe/warning device. The minimum recommended warning pipe diameter is 25mm with the overflow sized at twice that of the inlet diameter. (Or the equivalent diameter sized at twice the summation of inlet pipe bore areas for tanks with multiple inlets).

Most cisterns store wholesome water used in part, at least, for domestic purposes irrespective of other downstream system uses. Given those circumstances the cistern must then comply with Clause G16.13 of the Government Guidance as depicted in Figure 1.

Figure 1

Float valve

Screened air inlet Sleeve for vent pipe Securely fixed access cover

Straight or dipped entry to warning pipe

Warning pipe and/or overflow screen Insulation against frost and undue warming

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Fluid Categories 1-4

A simplified yet no less compliant approach to cistern design and application is to consider only the implications required to meet either Fluid Category 4 or 5 requirements.

Any cistern encompassing cistern design features, advised in Figure 1, and incorporating a Type AF Air Gap on its inlet/s will encompass fully the backflow protection requirements necessary for Fluid Categories 1-4 with little or no penalty in lost storage capacity.

The general thinking behind this recommended approach is that it’s better to be safe than sorry. It is considered there are greater inherent risks associated with larger and more complex water supply systems when limited information may be available.

This design approach, which covers approximately 90% of all cistern installations, provides for greater uniformity of application throughout the water supply industry. Figure 2 sets out the relative positions of a cistern’s inlet device relative to its warning pipe, overflow and normal top water level for a Type AF air gap requirement.

Figure 2

Figures 3-5 illustrate, for various cistern capacities, the

recommended plumbing arrangements compliant with providing Type AF Air Gap protection applicable for cisterns installed in domestic and commercial applications.

Figure 3: Cistern < 1000 litres

Figure 4: Cistern 1000-5000 litres

Figure 5: Cisterns > 5000 litres

INLET

Overflow

25mm minimum Air gap 2 x inlet dia

25mm minimum

Warning pipe

NORMAL TOP WATER LEVEL CRITICAL WATER LEVEL

SHUT OFF LEVEL

Air gap 2 x inlet dia 25mm minimum

Warning pipe/ overflow

SHUT OFF LEVEL

Air gap 2 x inlet dia 25mm minimum

25mm minimum

Overflow pipe Warning pipe

SHUT OFF LEVEL

Air gap 2 x inlet dia Level at which audible or

visible alarm is activated

50mm minimum between invert of overflow pipe and shut off level

Overflow pipe

Balmoral tanks are compliant

with the WRAS Regulator’s

Performance Specifications

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Fluid Category 5

The Regulations advise that a Type AB Air Gap must protect mains water supplies to any cistern installation providing storage for applications defined as a Fluid Category 5.

For closed top cisterns, Type AB Air Gap protection is required incorporating the use of a Weir Spill Slot in the cistern sidewall to act as the emergency overflow. Figure 6 advises the basic cistern configuration to meet this requirement.

Figure 6: Similar to old Type A Air Gap

The specific design details of a Type AB Air Gap is identified in BSEN 13077: 2003 “Devices to prevent pollution by backflow of potable water – Air gap with non circular overflow (unrestricted) – Family A, type B”.

It is acceptable to have the slot opening screened provided the size of the slot is increased in proportion to the obstruction imposed by the installation of the screening material.

Summary

Most cistern applications, whether domestic, commercial or industrial, can be accommodated by the adoption of Type AF Air Gap protection to the mains inlet supply.

Cistern applications, which in part at least require the stored water to supply an industrial process, laboratory, etc, can be accommodated by adopting Type AB Air Gap protection to the mains inlet supply.

Additional information on determining the classification of a fluid category is obtained from the WRAS IGN publication number 9-04-04.

54

Air gap 2 x inlet dia

Head over weir Weir spill slot

unscreened

Overflow pipe Warning pipe 25mm minimum

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Capacity(Litres) 1250 Length(mm) 1800 Width(mm) 1320 Height(mm) 915 Product code BWST-LP1250

LP1250

Capacity(Litres) 1365 Length(mm) 1300 Width(mm) 1300 Height(mm) 1320 Product code BWST-V1365 Capacity(Litres) 1800 Length(mm) 1400 Width(mm) 1400 Height(mm) 1500 Product code BWST-V1800 Capacity(Litres) 2600 Length(mm) 1580 Width(mm) 1580 Height(mm) 1665 Product code BWST-V2600 Capacity(Litres) 3500 Length(mm) 2800 Width(mm) 1700 Capacity(Litres) 3635 Length(mm) 1800 Width(mm) 1800

Above ground tank for mains supplied and

non-mains supplied potable water storage

V1365

Above ground tank for mains supplied andnon-mains supplied potable water storage

V1800

V2600

H3500

V3635

Balmoral water storage tanks

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56 Capacity(Litres) 5455 Length(mm) 2000 Width(mm) 2000 Height(mm) 2100 Product code BWST-V5455 Capacity(Litres) 7270 Length(mm) 2085 Width(mm) 2085 Height(mm) 2426 Product code BWST-V7270 Capacity(Litres) 10000 Length(mm) 2330 Width(mm) 2330 Height(mm) 2920 Product code BWST-V10000 Capacity(Litres) 1370 Length(mm) 1900 Width(mm) 1150 Height(mm) 1969

Product code BWST-UG1370-B1

Capacity(Litres) 2410 Length(mm) 2350 Width(mm) 1350 Height(mm) 2171

Capacity(Litres) 3090 Length(mm) 3200 Width(mm) 1350 Height(mm) 2171

V5455

V7270

V10000

UG1370

Underground tank for non-mains suppliedor indirect mains supplied water storage

UG2410

Underground tank for non-mains supplied

or indirect mains supplied water storage

UG3090

Underground tank for non-mains suppliedor indirect mains supplied water storage

Balmoral water storage tanks

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The tanks are rotationally moulded in black polyethylene material and incorporate the following features:

Q Unique stackable design for safe, economical storage

Q High level of security and anti-vandalism features

Q Integral plinth

Q Elevated hygiene characteristics, including guards to protect taps

Q Drainage system capable of draining tank fully after cleaning

Q Manufactured from WRAS approved materials Q Low maintenance

Q Forklift slots and lifting eyes for ease of handling

Balmoral

Hydrostack

The Balmoral Hydrostack has been specifically designed for the supply of water in emergency situations. These tanks are ideally suited for use in situations such as water shortages due to summer droughts, burst water pipes or Water Authority maintenance periods where supply is temporarily “cut-off”.

Ø600mm rotomoulded lid Ø1584 R792 517 Integral plinth Tank 18 95 77 9 55 5 17 40 Specifications Capacity(Litres) 1150 Diameter(mm) 1584 Height(mm) 1895 Plinth height(mm) 779 Lid(mm) Ø600

Tank colour Black

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Ba

lm

ora

BALMORAL TANKS

www.balmoraltanks.com

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Balmoral Group

Balmoral Group Holdings Ltd is a privately owned business headquartered in Aberdeen, UK, and has been providing solutions to the civil and environmental, building and energy sectors since 1980.

The enterprise has been built upon research, development and technical innovation. It is this commitment to progress that has helped the company achieve its status as a market leader in its chosen fields of operation.

The company has, for a number of years, successfully operated manufacturing processes at Balmoral Park which are approved and strictly regulated by the Scottish Environment Protection Agency under Part B of the Environmental Protection Act 1990.

Quality Assurance

Balmoral Tanks Ltd is certified to BS EN ISO 9001. The company’s QA manuals are available for examination by all clients.

The Balmoral name has become a

brand in its own right, synonymous

with product development,

technical excellence and

manufacturing efficiency.

Balmoral Tanks Ltd

Balmoral Tanks Ltd, a division of Balmoral Group Holdings Ltd, is a leading European engineering design and manufacturing company.

As a result of significant investment in people and plant, the company produces what is believed to be the most comprehensive range of tank products available from a single source in the EU.

Civil engineering, wastewater treatment, drainage, fuel oil containment, bulk liquid and potable water storage sectors are all key sectors for the company.

Visit balmoraltanks.com for a comprehensive overview of the company and its products.

Other Balmoral Tanks products Q Wastewater treatment plant

Q Rainwater harvesting systems

Q Bulk liquid storage

Q Chemical storage

Q Potable/non-potable water storage

Q Fuel oil storage and dispensing

Q Trade moulding

Q GRP sectional water storage

Q Steel sectional water storage

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HEAD OFFICE AND FACTORIES

Balmoral Park, Loirston, Aberdeen AB12 3GY, Scotland Tel +44 (0)1224 859000 Fax +44 (0)1224 859123 Email tanks@balmoral.co.uk www.balmoraltanks.com