Biological phosphorus removal in sequencing batch reactor with single-stage oxic process.
The performance of biological phosphorus removal (BPR) in a sequencing batch reactor (SBR) with single-stage oxic process was investigated using simulated municipal wastewater. The experimental results showed that BPR could be achieved in a SBR without anaerobic phase, which was conventionally considered as a key phase for BPR. Phosphorus (P) concentration 0.22-1.79 mg L(-1) in effluent can be obtained after 4h aeration when P concentration in influent was about 15-20 mg L(-1), the dissolved oxygen (DO) was controlled at 3+/-0.2 mg L(-1) during aerobic phase and pH was maintained 7+/-0.1, which indicated the efficiencies of P removal were achieved 90% above. Experimental results also showed that P was mainly stored in the form of intracellular storage of polyphosphate (poly-P), and about 207.235 mg phosphates have been removed by the discharge of rich-phosphorus sludge for each SBR cycle. However, the energy storage poly-beta-hydroxyalkanoates (PHA) was almost kept constant at a low level (5-6 mg L(-1)) during the process. Those results showed that phosphate could be transformed to poly-P with single-stage oxic process without PHA accumulation, and BPR could be realized in net phosphate removal.
Wang
Dong-Bo
DB
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
Li
Xiao-Ming
XM
Yang
Qi
Q
Zeng
Guang-Ming
GM
Liao
De-Xiang
DX
Zhang
Jie
J
D000091:Acetobacter; D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors; D002952:Citric Acid Cycle; D010710:Phosphates / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D019904:Polymethyl Methacrylate; D011122:Polyphosphates / Q000302:isolation & purification*; D012722:Sewage
D010710:Phosphates; D011122:Polyphosphates; D012722:Sewage; D010758:Phosphorus; D019904:Polymethyl Methacrylate