Operation of three parallel AN/AO processes to enrich denitrifying phosphorus removing bacteria for low strength wastewater treatment.
Three parallel anaerobic-anoxic/anaerobic-aerobic (AN/AO) processes were developed to enrich denitrifying phosphorus removal bacteria (DPB) for low strength wastewater treatment. The main body of the parallel AN/AO process consists of an AN (anaerobic-anoxic) process and an AO (anaerobic-aerobic) process. In the AO process, the common phosphorus accumulating organisms (PAOs) was dominate, while in the AN process, DPB was dominate. The volume of anaerobic zone(V(ana)):anoxic zone(V(ano)): aerobic zone (V(aer)) for the parallel AN/AO process is 1:1:1 in contrast with a V(ana):V(aer) and V(ano):V(aer) of 1:2 and 1:4 for a traditional biological nutrient removal process (BNR). Process 3 excels in the 3 processes on the basis of COD, TN and TP removal. For 4 month operation, the effluent COD concentration of process 3 did not exceed 60 mg/L; the effluent TN concentration of process 3 was lower than 15 mg/L; and the effluent TP concentration of process 3 was lower than 1 mg/L.
Xia
Si-Qing
SQ
State Key Lab of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. siqingxia@mail.tongji.edu.cn
Liu
Hong-Bo
HB
D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D010758:Phosphorus / Q000378:metabolism*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014877:Water Pollution, Chemical / Q000517:prevention & control*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D010758:Phosphorus