Geng Zuohong, Hall Eric R
Department of Civil Engineering, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, Canada V6T 1Z4.
Water Res. 2007 Nov;41(19):4329-38. doi: 10.1016/j.watres.2007.07.007. Epub 2007 Jul 12.
The physical and biochemical properties of activated sludge mixed liquor, including floc size distribution, zeta potential, relative hydrophobicity, and bound and unbound (soluble) extracellular polymeric substances (EPS), were examined in this study to evaluate their relationship to membrane fouling. Mixed liquors from a membrane enhanced biological phosphorus removal (MEBPR) process and a conventional enhanced biological phosphorus removal (CEBPR) process were compared. It was found that the floc size distribution and the amount of soluble EPS in the mixed liquor were the most important properties that significantly influenced the fouling propensity of sludge. Contrary to the literature, the content of EPS bound in activated sludge flocs was not found to be directly associated with membrane fouling, and sludge surface properties such as zeta potential and relative hydrophobicity were not closely related to the observed differences in the fouling tendencies of the two types of sludge.
本研究考察了活性污泥混合液的物理和生化特性，包括絮体尺寸分布、zeta电位、相对疏水性以及结合态和游离态（可溶性）胞外聚合物（EPS），以评估它们与膜污染的关系。比较了膜生物强化除磷（MEBPR）工艺和传统强化生物除磷（CEBPR）工艺的混合液。结果发现，混合液中的絮体尺寸分布和可溶性EPS含量是显著影响污泥污染倾向的最重要特性。与文献报道相反，未发现活性污泥絮体中结合态EPS的含量与膜污染直接相关，并且污泥表面性质如zeta电位和相对疏水性与两种污泥在污染趋势上观察到的差异没有密切关系。
