胞外聚合物调控污水微生物聚集体结构功能及表面特性的研究进展

胞外聚合物(extracellular polymeric substance, EPS)是污水处理系统内微生物聚集体的重要组成部分,其组分及含量与微生物聚集体的结构、功能和表面特性息息相关。基于已有研究成果,系统综述了EPS在维持微生物聚集体结构组成、强化其功能活性中发挥的作用,进一步从EPS对微生物聚集体的传质性能、亲/疏水性、物化稳定性、流变性能和脱水性能的调控作用,探究了EPS影响微生物聚集体功能活性的行为机理,旨在为改善污水生物聚集体的聚集性能、提高泥水分离效率、强化水处理能力提供理论基础和科学依据。

REVIEW OF ROLES OF EXTRACELLULAR POLYMERIC SUBSTANCES （EPS） IN MEDIATING THE STRUCTURE,FUNCTION AND SURFACE PROPERTIES OF MICROBIAL AGGREGATES IN WASTEWATER TREATMENT SYSTEMS

As one of the most important components of microbial aggregates, the compositions and contents of extracellular polymeric substances(EPS) are closely related to the structure, functional activities and surface properties of microbial aggregates. Based on the existed research findings, the roles of EPS in maintaining the structural composition and strengthening the functional activities of microbial aggregates were systematically reviewed in this article. The modulating effects of EPS on the mass transfer performance, hydrophilia/hydrophobicity, physiochemical stability, rheological property and dewaterability of microbial aggregates are further summarized to explore the potential mechanisms involved in the influences of EPS on their functions. This article can provide a theoretical and scientific basis for improving the aggregation properties of microbial aggregates, the slurry separation efficiency and sewage treatment capacity.