Chemical and biological flocculation process to treat municipal sewage and analysis of biological function.
The pilot-scale experimental apparatus and the procedure of the chemical and biological flocculation process to verify the feasibility in treating Shanghai municipal sewage were introduced in this paper. In addition, the biological function of the process was discussed. The results of optimal running showed that in the reaction tank, the concentration of mixed liquor suspended solid(MLSS) was 2 g/L, hydraulic retention time(HRT) was 35 min, dosage of liquid polyaluminium chloride(PAC) was 60 mg/L, and the concentration of polyacrylamide(PAM) was 0.5 mg/L. The effluent average concentrations of COD(Cr), TP, SS and BOD5 were 50 mg/L, 0.62 mg/L, 18 mg/L, and 17 mg/L, respectively. These were better than the designed demand. In addition, the existence of biological degradation in this system was proven by several methods. The removal efficiencies of the chemical and biological flocculation process were 20% higher than that of the chemical flocculation process above at the same coagulant dosage. The treatment process under different situations was evaluated on a pilot-scale experiment, and the results provided magnificent parameters and optimal condition for future operation of the plant.
Xia
Si-qing
SQ
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. siqingxia@mail.tongji.edu.cn
Yang
Dian-hai
DH
Xu
Bin
B
Zhao
Jian-fu
JF
D000180:Acrylic Resins; D000536:Aluminum Hydroxide; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002681:China; D005427:Flocculation; D010100:Oxygen / Q000378:metabolism; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D000099166:Polyacrylamides
D000180:Acrylic Resins; D000536:Aluminum Hydroxide; D010100:Oxygen; D012722:Sewage; D000099166:Polyacrylamides; C016213:aluminum oxychloride