污泥浓度对MBR混合液特性及膜污染的影响  

Influence of MLSS on Mixed Liquor Characteristics and Membrane Fouling in Membrane Bioreactor

作　　者：陆继来[1] 刘舒华[2] 张敏健[1] 齐菲[2] 张雨[3] 吴海锁[1] 

机构地区：[1]江苏省环境科学研究院,江苏南京210036 [2]南京工业大学环境学院,江苏南京211800 [3]包头市排水产业有限责任公司,内蒙古包头014030

出　　处：《中国给水排水》2014年第9期92-95,共4页China Water & Wastewater

基　　金：江苏省环保科技项目(201291);国家水体污染控制与治理科技重大专项(2012ZX07101-003);江苏省太湖治理科研项目(TH2012204);江苏省自然科学基金资助项目(BK2011032)

摘　　要：研究了污泥浓度对MBR混合液特性及膜污染的影响。试验条件下,提高污泥浓度则对COD的去除率升高,但对TN、TP的去除率反而降低;在低污泥浓度条件下,微生物会分泌更多的溶解性微生物产物,从而加速膜污染过程,对于污泥浓度分别为4 000、7 000、10 000 mg/L的MBR,膜污染周期分别为10、13和16 d;随着污泥负荷的提高,混合液中胞外聚合物(EPS)含量增加,污泥沉降性恶化;周期性的排泥方式有助于降低反应器内的EPS含量,且有利于对TN和TP的去除。The effect of MLSS on mixed liquor characteristics and membrane fouling in membrane bioreactor was investigated. The results showed that the COD removal rate increased and the TN and TP removal rates decreased as MLSS content was increased. Microorganisms secreted more soluble microbial products under low sludge concentration, accelerating the process of membrane fouling. The periods of membrane fouling were 10 d, 13 d and 16 d for MBR with MLSS of 4 000 mg/L, 7 000 mg/L and 10 000 mg/L, respectively. The content of EPS increased and SVI deteriorated as the sludge loading increased. Periodic sludge discharge helped to reduce EPS in the reactor and improve the removal rate of TN and TP.

关 键 词：污泥浓度 膜生物反应器 混合液特性 微生物代谢产物 膜污染 

分 类 号：X703[环境科学与工程—环境工程]