Abstract：
A review of the characterization and functions of extracellular polymeric substances (EPS) of microbial aggregates in biological wastewater treatment systems is presented in this paper. EPS represent the complex high-molecular-weight mixture of polymers excreted by microorganisms generated from cell lysis as well as adsorbed inorganic and organic matter from wastewater. EPS exhibit a three-dimensional, gel-like, highly hydrated matrix that facilitates microbial attachment, embedding, and immobilization. EPS play multiple roles in containments removal, and the main components of EPS crucially influence the properties of microbial aggregates, such as adsorption ability, stability, and formation capacity. Moreover, EPS are important to sludge bioflocculation, settleability, and dewatering properties and could be used as carbon and energy sources in wastewater treatment. However, due to the complex structure of EPS, related knowledge is incomplete, and further research is necessary to understand fully the precise roles in biological treatment processes.
摘要：
本文综述了生物废水处理系统中微生物聚集体的胞外聚合物（EPS）的表征和功能。EPS代表由细胞裂解产生的微生物以及废水中吸附的无机和有机物质排泄的聚合物的复杂高分子量混合物。EPS表现出三维，凝胶状,促进微生物附着的高度水合基质，嵌入,和固定。EPS在容器清除中起着多重作用，EPS的主要成分对微生物聚集体的性质有重要影响，如吸附能力，稳定性,和形成能力。此外，EPS对污泥生物絮凝很重要，沉降性，和脱水性能，可用作废水处理中的碳源和能源。然而,由于EPS结构复杂，相关知识不完整，和进一步的研究是必要的，以充分了解在生物处理过程中的确切作用。
