School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2013 Jan;128:586-92. doi: 10.1016/j.biortech.2012.11.005. Epub 2012 Nov 9.
In order to obtain a better understanding of the relationship between sludge characteristics and the cake formation in membrane bioreactors (MBRs), the characteristics of cake sludge and bulk sludge were investigated and compared. Based on the extended Derjaguin-Landau-Verwey-Overbeek (extended DLVO) theory, the aggregation abilities of cake sludge and bulk sludge were also evaluated. It is observed that cake sludge showed worse aggregation ability than bulk sludge. Further analysis indicated that small flocs, colloids, loosely bound extracellular polymeric substances (LB-EPS), hydrophobicity and negative charge played important role in cake formation and sludge aggregation. Cake sludge with worse aggregation had higher distribution spread index (DSI), more colloids and LB-EPS, higher hydrophobicity and more negative charge. The results indicated that sludge aggregation might reflect membrane fouling potential of sludge.
为了更好地理解污泥特性与膜生物反应器（MBR）中泥饼形成之间的关系，研究并比较了泥饼和混合污泥的特性。基于扩展的德热那广义-朗道-维尔威-奥弗贝克（extended DLVO）理论，评估了泥饼和混合污泥的聚集能力。结果表明，泥饼的聚集能力比混合污泥差。进一步的分析表明，小絮体、胶体、松散结合的胞外聚合物（LB-EPS）、疏水性和负电荷在泥饼形成和污泥聚集中起重要作用。聚集能力较差的泥饼具有更高的分布扩散指数（DSI）、更多的胶体和 LB-EPS、更高的疏水性和更多的负电荷。结果表明，污泥聚集可能反映了污泥的膜污染潜力。
