The State Engineering Research Center for Municipal Pollution Control under the College of Environmental Science and Engineering, Tongji University, 200092 Shanghai, PR China.
Carbohydr Polym. 2013 Jan 30;92(1):510-5. doi: 10.1016/j.carbpol.2012.09.055. Epub 2012 Oct 2.
Extracellular polymeric substances (EPSs) originating from the metabolism or lysis of microorganisms play important roles in biological wastewater treatment. It is necessary to understand the correlation between EPSs and the reactor operation and sludge-retention time (SRT) of the activated-sludge process to gain efficient operational strategies. Laboratory-scale completely mixed activated-sludge processes were used to grow the activated sludge with starch or glucose. Two modes of reactor operation, the S-mode and B-mode, were investigated. The results showed that polysaccharides and proteins were the main constituents in the EPSs. The percentage of polysaccharides (PSs) and proteins (PNs) in the loosely bound EPSs (LB-EPSs) and tightly bound EPSs (TB-EPSs) were 18-90% and 18-85%, respectively. The LB-EPS content was related to the operation modes and SRT. The LB-EPS contents in B-mode were triple that of S-mode, and the LB-EPS yield of sludge decreased at an increased SRT. The polysaccharides and proteins in the LB- and TB-EPSs were both dependent on the operation modes and SRT.
胞外聚合物（EPSs）来源于微生物的代谢或裂解，在生物废水处理中发挥着重要作用。有必要了解 EPSs 与反应器操作和活性污泥工艺的污泥停留时间（SRT）之间的相关性，以获得有效的操作策略。利用实验室规模的完全混合活性污泥工艺培养以淀粉或葡萄糖为底物的活性污泥。研究了两种反应器操作模式，即 S 模式和 B 模式。结果表明，多糖和蛋白质是 EPSs 的主要成分。松散结合 EPS（LB-EPS）和紧密结合 EPS（TB-EPS）中多糖（PSs）和蛋白质（PNs）的百分比分别为 18-90%和 18-85%。LB-EPS 含量与操作模式和 SRT 有关。B 模式下的 LB-EPS 含量是 S 模式的三倍，随着 SRT 的增加，污泥的 LB-EPS 产率下降。LB-和 TB-EPS 中的多糖和蛋白质都依赖于操作模式和 SRT。
