Dewatering Excess Sludges of Sanitary Sewage by Supersound and PAFC

This experiment adopted supersound and polymeric aluminum ferric chloride (PAFC) dewatering excess sludges. Firstly, aluminum chloride and ferric chloride were synthetized to a novel inorganic flocculant ——PAFC and the optimal molar ratio of A1 and Fe was 7:3. Secondly, PAFC singly dewatered excess sludges. The optimum technological conditionwas the optimum dosage of 120mg/L and pH of 8. As a result , the sludge water content decreased from 87.48% to 70.87%. Thirdly, supersound singly dewatered excess sludges. The optimum technological condition was the optimum power of 150W and time of 2.5min. Lastly, the combination of supersound and PAFC sludge dewatered excess sludges and moisture content was reduced to 70.01%.