Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch  

回流污泥预浓缩强化新型氧化沟系统生物除磷的研究(英文)

作　　者：刘巍 杨殿海 徐立 贾川 卢文建 BOSIRE Omosa Isaiah 沈昌明 

机构地区：[1]State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Sciences and Engi-neering,Tongji University [2]UNEP-TONGJI Institute of Environment for Sustainable Development,College of Environmental Sciences and Engineering,Tongji University

出　　处：《Chinese Journal of Chemical Engineering》2012年第4期747-753,共7页中国化学工程学报（英文版）

基　　金：Supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2008ZX07316)

摘　　要：A pilot-scale,pre-anoxic-anaerobic oxidation ditch was used in this study to treat municipal wastewater with limited carbon source.A novel return activated sludge(RAS) pre-concentration tank was adopted for improv-ing the phosphorus removal efficiency and the effects of RAS pre-concentration ratio were studied.Under the opti-mal operational condition,the suspended total phosphorus(STP) and the total phosphorus(TP) removal efficiencies were around 58.9% and 63.9% respectively and the effluent-P was lower than 0.8 mg·L-1.The reason is that with the optimal RAS pre-concentration ratio,nitrate is completely removed with endogenous carbon source and the secondary phosphorus release is strictly restrained in the pre-anoxic tank.Therefore,the anaerobic phosphorus release and the carbon source uptake by phosphorus accumulation organisms(PAOs) in the sludge,which are ex-tremely important to the phosphorus removal process,can be fully satisfied.Furthermore,the oxidation-reduction potential is proved to be suitable for controlling the RAS pre-concentration ratio due to influent fluctuation and varied conditions.The novel modified system is also beneficial for PAO accumulation.A pilot-scale,pre-anoxic-anaerobic oxidation ditch was used in this study to treat municipal wastewater with limited carbon source.A novel return activated sludge（RAS） pre-concentration tank was adopted for improv-ing the phosphorus removal efficiency and the effects of RAS pre-concentration ratio were studied.Under the opti-mal operational condition,the suspended total phosphorus（STP） and the total phosphorus（TP） removal efficiencies were around 58.9% and 63.9% respectively and the effluent-P was lower than 0.8 mg·L-1.The reason is that with the optimal RAS pre-concentration ratio,nitrate is completely removed with endogenous carbon source and the secondary phosphorus release is strictly restrained in the pre-anoxic tank.Therefore,the anaerobic phosphorus release and the carbon source uptake by phosphorus accumulation organisms（PAOs） in the sludge,which are ex-tremely important to the phosphorus removal process,can be fully satisfied.Furthermore,the oxidation-reduction potential is proved to be suitable for controlling the RAS pre-concentration ratio due to influent fluctuation and varied conditions.The novel modified system is also beneficial for PAO accumulation.

关 键 词：denitrifying phosphorus removal NITRATE oxidation ditch phosphorus return activated sludge pre-concentration secondary phosphorus release 

分 类 号：X703[环境科学与工程—环境工程]