曝气强度对膜生物反应器中胞外聚合物组成及分布的影响

Effect of Aeration Intensity on the Components of Extracellular Polymeric Substances and Their Distribution in Membrane Bioreactor System

DOI：10.3969/j.issn.1673-1689.2015.09.004

中文关键词: 曝气强度 膜生物反应器 胞外聚合物

英文关键词: aeration intensity, membrane bioreactor, extracellular polymeric substances

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中文摘要:

以膜生物反应器处理模拟生活废水为研究体系，研究了曝气强度对系统比耗氧速率、胞外聚合物含量及分布的影响。结果表明，随着曝气强度增大，比耗氧速率增加，反应器内上清液胞外聚合物含量下降，污泥胞外聚合物含量则变化不大，且胞外聚合物组成均以多糖为主。然而，膜污染层中溶解态胞外聚合物及总胞外聚合物含量随曝气强度升高而增加，其组成以蛋白质为主。膜污染速率与污泥混合液溶解态胞外聚合物中蛋白质与多糖的比值呈正相关。

英文摘要:

In this study，the effect of aeration intensity on specific oxygen utilization rate (SOUR)，the content of extracellular polymeric substances (EPS) and their distribution during synthetic wastewater treating was investigated in membrane bioreactor (MBR) system. The results showed that SOUR was increased and the EPS content in the MBR supernatant dropped by increasing the aeration intensity，but it didn't change much in sludge. The EPS both in supernatant and sludge were dominated by polysaccharides. However，the EPS content in membrane fouling layer increased along with the aeration intensity and was mainly consisted of proteins. The membrane-fouling rate was in proportion to the proteins/polysaccharides ratio in soluble EPS of the mixed liquid.

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