胞外聚合物(EPS)对污水处理影响的研究进展

Research progress o fthe effects of extracellular polymeric substances(EPS)on wastewater treatment system

胞外聚合物(EPS)是污水处理厂生物处理单元常见的微生物副产物,它的赋存情况对污水处理厂不同单元的影响不同。基于已有研究成果,总结了EPS的定义,对其架构、组成及功能等进行了详细描述;分别综述了EPS在生物处理单元对微生物生长、颗粒污泥的形成、微生物聚集体的絮凝与沉降性能的影响,在深度处理单元对渗透膜通透性、催化剂传质等性能的影响,在污泥处理单元对污泥消化和脱水性能的影响,并对EPS在不同污水处理单元的行为机理进行了汇总与探索;最后对未来EPS在污水处理中的研究方向与研究内容进行了展望。

Extracellular polymeric substances(EPS)is a common microbial by-product of biological treatment process in wastewater treatment plants.Its occurrence has different effects on various processes of wastewater treatment system.Firstly,on the basis of previous studies,the definition of EPS was summarized,and the structure,compositions and functions of it was described in detail.Secondly,the effects of EPS on the growth of microorganisms,the formation of granular sludge,the flocculation and sedimentation performance of microbial aggregates in the biological treatment process,the permeability of the membrane and the mass transfer of the catalyst in the advanced treatment process,the impact of sludge digestion and dehydration performance in the sludge treatment process were reviewed.The behavior mechanisms of EPS in different wastewater treatment process were summarized and explored.Finally,the future research directions and contents of EPS in wastewater treatment were proposed.