胞外聚合物EPS对活性污泥沉降性能的影响研究  

Effect of extracellular polymeric substances(EPS) on sedimentation of activated sludge

作　　者：周健[1] 龙腾锐[1] 苗利利[1] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045

出　　处：《环境科学学报》2004年第4期613-618,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重点项目(59838300);重庆市应用基础研究项目(7279)

摘　　要：对污泥负荷Ns、溶解氧(DO)对活性污泥中胞外聚合物EPS的组分、含量及污泥沉降性能的影响进行了研究;并对EPS对污泥沉降性能影响的作用机理进行了探讨.试验结果表明:负荷对EPS影响高度显著,而DO对EPS影响较小;EPS与污泥沉降性能SVI相关性高;随着负荷降低,EPS含量增加,SVI增加.同时正交试验结果表明:污泥中EPS的含量高低主要由负荷决定,并得出Ns、DO对EPS及SVI的影响模式.此外,根据有关试验结果分析了在低负荷时易发生污泥膨胀的原因.The effect of loading rate(Ns)and dissolved oxygen(DO)on composition, content of extracellular polymeric substances(EPS) and　sedimentation performance of activated sludge were studied. Results showed that Ns significantly affected EPS and, and the effect of DO on EPS was negligible. As Ns reducing, the content of EPS and SVI increased and they were significantly correlated each other. On the other hand, results of orthogonal experiment indicated that the factor controlling the content of EPS was Ns, and the mode of Ns and DO affecting EPS and SVI was deduced. In addition, according to experiment results, the causes of sludge bulking at low loading rate could be as follows: the EPS was more,moreover a part of EPS might be the nutriment of filamentous bacteria and promoted filamentous bacteria increase.

关 键 词：胞外聚合物 EPS 活性污泥 沉降性能 DO 生物絮体 

分 类 号：X703[环境科学与工程—环境工程]