CEDENCO Project

A complete system of TWS, installed at Cedenco premises, Gisborne to treat the waste water.

Cedenco Foods is a food ingredient processing and marketing company with factory operations in Gisborne, New Zealand. Whilst remaining independent of any food retail manufacturer the Cedenco Group is now 100% owned by USA food processor SK Foods.

Cedenco produces and exports vegetable and fruit powders; aseptic paste, purees and dice; UHT purees; frozen purees; and Individually Quick Frozen (IQF) products to customers in countries including Australia, Japan, Asia, the Middle East, North America and Europe. These products include sweetcorn, pumpkin, tomato, peas, onions, celery,

apples, pears, kiwifruit, broccoli, capsicum and carrots. Certified by Bio-Gro New Zealand as an organic producer, Cedenco produces organic products specific to individual customer requirements.

Gisborne and Echuca both have a mild, sunny climate and fertile soils which enable the supply of a wide range of process-grade fruit and vegetable crops.

Cedenco Foods in Gisborne, New Zealand, operates four key processes producing:

 Powder - sweetcorn, pumpkin and tomato

 Aseptic Paste - tomato, apple, onion and kiwifruit

 UHT Puree - sweet corn, pumpkin, celery, green peas, carrots, onion and broccoli

 Frozen Puree - sweetcorn and pumpkin

 IQF - Individually Quick Frozen (IQF) sweetcorn, peas, celery, onion, capsicums and broccoli ingredients

Problem

Waste that has been produced by tomato, sweet corn, onion and pumpkin etc filled in to a clarifier. And this contains so much waste that shouldn’t be exposed to normal/drinking water. There is a guidelines by City council for the waste disposal which they are unable to maintain. Technical water Systems is trying to solve

Cedenco’s problem with the developed system. A system has been installed and is under trial.

According to Technical Water Systems, the system is working and is giving excellent results. TWS wanted us to visit the plant and the system to have a look and experience. So Aprof Subhas Mukopadhyay and I visited cedenco waste water treatment plant with a few objectives such as:

1. To visit the Cedenco plant and to have a look of the installed system, 2. to see the operation of magnetic circle and the complete TWS system, 3. to collect some samples from every input point and output point.

Main system consists of two magnetic circles and two types of scuds (filters). Even though the installation is almost complete, the complete system is not in operation. Only one magnetic circle was connected to the main clarifier. The use of magnetic circle is shown with the help of block diagram 1. The waste water is passed through the magnetic circle taken at some depth of the clarifier and discharged at top. It was not possible to collect all the samples that we wanted. Samples had been collected from the top of the clarifier and the sludge point at 3.

Figures 4.17 to 4.23 show different pictures taken there.

Magnetic Circle-1 Magnetic Circle-2

Main Control box

Electromagnets that are used by TWS

Cooling system for electromagnetic heads

Figure 4.18: one of the magnetic circles for the generation of magnetic field used by Technical Water Systems and the cooling system

Figure 4.19: Sweet corn and tomato stock

Fi Figure 4.21: Top view of the main

clarifie gure 4.20: main clarifier

Figure 4.23: tomato water tank some of the water gone through the

Magnetic treatment Figure 4.22: 2nd TWS system for

leaning only tomato waste water c

Description of the samples

Two samples had been collected from at point – 1. At the moment of collection magnetic circle wasn’t working so we have decided to collect one sample (SAMPLE- 1) at 11.30am and one (SAMPLE-2) at 12.00pm. Another sample was collected at point – 3(SAMPLE-3) which is bottom of the clarifier. And another treatment plant was working on cleaning only tomato water. So another two samples had been collected at input (SAMPLE-4) to the magnetic circle and output (SAMPLE-5) of the magnetic circle. All the samples have passed to testing laboratory to test for the total Fe, Ca, Mg and sulphate on the supernatant, and the oil and grease on the supernatant plus solids.

Results

The results obtained from Central Environmental Laboratory are given below. Table 4.8: CEDENCO Test results

Sample PH Calcium (g/m3) Iron (g/m3) Magnesium (g/m3) Sulphate (g/m3 SO4) Fats, Oils and Greases (g/m3) SAMPLE-1 6.36 14.6 0.817 5.02 19.8 SAMPLE-2 7.59 14.4 1.24 5.06 19 SAMPLE-3 3.63 18.7 15.5 8.6 21.9 3800 SAMPLE-4 6.44 10.8 5.76 1.26 6 SAMPLE-5 3.99 11 5.86 1.27 5.19

We see from the results we can see that sample-2 has higher iron content than sample- 1. This may be due to fact that magnetic circle wasn’t working so the iron content in the clarifier had gone up slightly. And the magnesium, calcium and sulphate content remained all most same all the time as the magnetic field has very little effect. Since the sample-3 has been collected from the bottom of the clarifier so all the wastes (heavy particles) have gone down to the bottom so sample-3 has a very high concentration of calcium, Iron, magnesium and sulphate. Sample – 4 and sample – 5 have almost same amount of everything because even though tomato (sample – 4) goes through the magnetic circle once afterwards it get mixed with normal water. PH value of Sample – 1 has gone up from 6.36 to 7.59 (Sample – 2) after half and hour. Ph value of bottom of the clarifier was 3.63. So it was more acidic at the bottom. Sample – 5 is more acidic than sample – 4. Overall sample – 3 had a very high Fats, Oils and Greases concentration.