剩余污泥中胞外聚合物（EPS）组分的特性及其对生物絮凝性的影响。
Characteristics of extracellular polymeric substances (EPS) fractions from excess sludges and their effects on bioflocculability.
作者信息
Yu Guang-Hui, He Pin-Jing, Shao Li-Ming
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
出版信息
Bioresour Technol. 2009 Jul;100(13):3193-8. doi: 10.1016/j.biortech.2009.02.009. Epub 2009 Mar 9.
Extracellular polymeric substances (EPS) of biological origin are ubiquitous in excess sludges and can be applied as an underlying bioflocculant, owing to their high content of macromolecules and cations. However, low flocculating activity limits the feasibility of their practical applications. This study provides a novel EPS fractionation approach to improve their flocculability by extracting an active EPS fraction and removing the others with low flocculability. The results showed that for two excess sludges (called sludge A and sludge B), the tightly bound EPS (TB-EPS) fraction possessed a high flocculating rate to kaolin suspension compared with the other EPS fractions [i.e., supernatant, slime, and loosely bound EPS (LB-EPS) fraction] (>54.1+/-1.4% vs <7.8+/-1.6%). High bioflocculability of TB-EPS fraction could be attributable to high contents of macromolecules (330-1200 kDa) and trivalent cations (Fe(3+) and Al(3+)). Further investigation reveals that the TB-EPS fraction caused aggregation of particles by bridging and sweep flocculation.
生物源胞外聚合物（EPS）在剩余污泥中普遍存在，由于其大分子和阳离子含量高，可作为潜在的生物絮凝剂。然而，低絮凝活性限制了其实际应用的可行性。本研究提供了一种新颖的EPS分级方法来提高其絮凝性，即提取活性EPS级分并去除其他低絮凝性的级分。结果表明，对于两种剩余污泥（称为污泥A和污泥B），与其他EPS级分[即上清液、黏液和松散结合EPS（LB-EPS）级分]相比，紧密结合EPS（TB-EPS）级分对高岭土悬浮液具有较高的絮凝率（>54.1±1.4%对<7.8±1.6%）。TB-EPS级分的高生物絮凝性可归因于大分子（330 - 1200 kDa）和三价阳离子（Fe(3+)和Al(3+)）的高含量。进一步研究表明，TB-EPS级分通过桥连和卷扫絮凝导致颗粒聚集。
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