Influence of aeration intensity on the performance of A/0-type sequencing batch MBR system treating azo dye wastewater  

作　　者：Xinhua WANG Jingmei LI Xiufen LI Guocheng DU 

机构地区：[1]Laboratory of Environmental Biotechnology,School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China [2]Key Laboratory of Industrial Biotechnology,Ministry of Education,Jiangnan University,Wuxi 214122,China

出　　处：《Frontiers of Environmental Science & Engineering》2011年第4期615-622,共8页环境科学与工程前沿（英文）

基　　金：This research was supported by the National Natural Science Foundation of China(Grant No.50678073);the Tai-Lake Water Specific Program of Jiangsu Province(No.BS2007125);the Scientifically and Technologically Supported Program of Jiangsu Province(No.BE2009636).

摘　　要：Among the numerous parameters affecting the membrane bioreactor(MBR)performance,the aeration intensity is one of the most important factors.In the present investigation,an anoxic/aerobic-type(A/O-type)sequencing batch MBR system,added anoxic process as a pretreatment to improve the biodegradability of azo dye wastewater,was investigated under different aeration intensities and the impact of the aeration intensity on effluent quantity,sludge properties,extracellular polymeric substances(EPS)amount generated as well as the change of permeation flux were examined.Neither lower nor higher aeration intensities could improve A/O-type sequencing batch MBR performances.The results showed 0.15 m^(3)·h^(-1)aeration intensity was promising for treatment of azo dye wastewater under the conditions examined.Under this aeration intensity,chemical oxygen demand(COD),ammonium nitrogen and color removal as well as membrane flux amounted to 97.8%,96.5%,98.7%and 6.21 L·m^(-2)·h^(-1),respectively.The effluent quality,with 25.0 mg·L^(-1)COD,0.84 mg·L^(-1)ammonium nitrogen and 8 chroma,could directly meet the reuse standard in China.In the meantime,the sludge relative hydrophobicity,the bound EPS,soluble EPS and EPS amounts contained in the membrane fouling layer were 70.3%,52.0 mg·g^(-1)VSS,38.8 mg·g^(-1)VSS and 90.8 mg·g^(-1)VSS,respectively,which showed close relationships to both pollutant removals and membrane flux.

关 键 词：batch membrane bioreactor azo dye aeration intensity extracellular polymeric substances sludge properties 

分 类 号：X70[环境科学与工程—环境工程]