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Role of extracellular polymeric substances (EPS) production in bioaggregation: application to wastewater treatment

机译：细胞外聚合物（EPS）生产在生物聚集中的作用：在废水处理中的应用

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摘要

This paper reviews the formation, structure, and stability of bioaggregates with an emphasis on the composition and distribution of extracellular polymeric substances (EPS) and their role in bioaggregation. Bioaggregation is ubiquitous in natural environment and is of great importance in biological wastewater treatment processes. It greatly influences the flocculability, settleability, and dewaterability for flocs and sludge retention and shear resistance for biofilms. The physico-chemical and microbial structures of bioaggregates are dependent on operational conditions as well as microbial diversity and spatial distribution. The formation of bioaggregates is mediated by the physico-chemical interactions as well as the microbial interactions such as EPS production and quorum sensing. EPS are composed of a mixture of macromolecules including proteins, polysaccharides, humic-like substances, and nucleic acids, which entrap the microbial cells in a three-dimensional matrix. The composition and physico-chemical characteristics of EPS have significant influence on the maintenance of the bioaggregate structure and the process performance of the wastewater treatment. However, the mechanisms of bioaggregation are still unclear and the conclusions on the role of EPS were mostly drawn from the established correlations and hypotheses. This paper expects to provide up-to-date knowledge on bioaggregation and insights for further studies and applications.
机译：本文综述了生物聚集体的形成，结构和稳定性，重点介绍了细胞外聚合物（EPS）的组成和分布及其在生物聚集中的作用。生物聚集在自然环境中无处不在，在生物废水处理过程中非常重要。它极大地影响了絮凝物的絮凝性，沉降性和脱水性以及生物膜的污泥保留和抗剪切性。生物聚集体的物理化学和微生物结构取决于操作条件以及微生物多样性和空间分布。生物聚集体的形成是由物理化学相互作用以及微生物相互作用（例如EPS产生和群体感应）介导的。 EPS由包含蛋白质，多糖，腐殖质和核酸的大分子混合物组成，这些微生物将微生物细胞包裹在三维矩阵中。 EPS的组成和理化特性对生物聚集体结构的维持和废水处理的工艺性能有重要影响。然而，生物聚集的机制仍不清楚，关于EPS作用的结论主要来自已建立的相关性和假设。本文期望提供有关生物聚集的最新知识和见解，以供进一步研究和应用。

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