하수처리장에서 탈수여액의 총부하량 저감에 관한 연구

Abstract

In this study, poly-aluminum chloride (PAC) was investigated as a candidate phosphorous removal agent in order to reduce the total load capacity of sludge at a full-scale sewage treatment plant. higher doses of PAC resulted in increased phosphorus removal but an excessive amount of PAC increased the concentration of suspended solids in the effluent. Therefore, maintaining an optimum dose of PAC is crucial for the successful operation of the sludge dewatering process, enabling greater phosphorus without increasing the concentration of suspended solids in the effluent. A study of the dewatering during their daily operation between 9:00 and 21:00 showed that a high concentration of desorbed filtrate flows affect the quality of the effluent at night. PAC was added to the sludge to ensure stable water quality management and a statutory discharge water quality. the Optimum PAC dose was found through lab-scale testing and implementation at a full-scale sewage treatment plant, where a 1,000 mg/L dose of PAC was found to increase the TP removal efficiency of the system by 9.2%. Therefore the total loading capacity of the sludge can be reduced by optimizing the PAC dose. based on the experimental results at full scale, the application of PAC was found to be an alternative solution for improving the water quality at both new and existing sewage treatment plants.