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Thermal Treatment of Municipal Sewage Sludge Aiming at Marketable P Fertilisers

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Figure

Fig. 1Schematic of the experimental set-up for thermochemical trials including lab-scale rotary furnace (quartz glass reactor; L:200 mm,D:150 mm), PTFE-tube for off-gas cooling and condensation of heavy metals, washing flasks for heavy metals rejection and wetscrubbers (NaOH, 5%) for HCl- and SO2-removal.
Table 1Composition of different sewage sludge ashes and a residue from gasification of sewage sludge (‘‘aqua regia’’ digests[microwave], measured with ICP-OES) and limit values of two European Fertiliser Ordinances.
Fig. 3Influence of the temperature on the removal of Zn from the threebasic ashes.
Fig. 5Influence of the retention time on the removal of Zn from the threebasic ashes.

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