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›› 2012, Vol. 12 ›› Issue (5): 834-838.

• 生化工程专栏 • 上一篇    下一篇

生活污水处理中胞外聚合物对膜污染的影响

马兴冠 纪文娟 孙俊平 薛向欣 杨合 傅金祥   

  1. 沈阳建筑大学市政与环境工程学院 沈阳建筑大学市政与环境工程学院 沈阳建筑大学市政与环境工程学院 东北大学材料与冶金学院 东北大学材料与冶金学院 沈阳建筑大学市政与环境工程学院
  • 收稿日期:2012-08-07 修回日期:2012-09-18 出版日期:2012-10-20 发布日期:2012-10-20
  • 通讯作者: 纪文娟

Effect of Extracellular Polymeric Substances on Membrane Fouling during Domestic Wastewater Treatment

MA Xing-guan JI Wen-juan SUN Jun-ping XUE Xiang-xin YANG He FU Jin-xiang   

  1. School of Municipal and Environmental Engineering, Shenyang Jianzhu University School of Municipal and Environmental Engineering, Shenyang Jianzhu University School of Municipal and Environmental Engineering, Shenyang Jianzhu University School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University School of Municipal and Environmental Engineering, Shenyang Jianzhu University
  • Received:2012-08-07 Revised:2012-09-18 Online:2012-10-20 Published:2012-10-20
  • Contact: JI Wen-juan

摘要: 采用模拟生活污水,在室温下研究了蛋白质、多糖、蛋白质/多糖浓度比(P/P)及胞外聚合物(EPS)浓度对膜污染的影响,建立了影响因素与膜压差(Dp)的二项式非线性回归方程. 结果表明,蛋白质和P/P对Dp有很大影响,其相关系数R2分别为0.5367和0.4298,原因是蛋白质很容易在膜表面上沉积且形成二次吸附,造成膜孔变小和堵塞. EPS浓度对Dp的影响较小,R2为0.1185. 多糖浓度对Dp的影响无明显的规律性是因为模拟的生活污水中的多糖浓度高和其沉积或物理吸附作用. 实验得出蛋白质是影响膜污染的最主要因素,可通过改变蛋白质与膜之间的相互作用,降低蛋白质在膜吸附层的沉积.

关键词: 胞外聚合物, 膜压差, 蛋白质, 多糖

Abstract: The effects of concentrations of protein and polysaccharide, concentration ratio of protein to polysaccharide (P/P) and total quantity of extracellular polymeric substances (EPS) on membrane fouling of a membrane bioreactor were studied by simulating domestic wastewater at room temperature. The relationships between these parameters and transmembrane pressure (Dp) were described by establishing binomial nonlinear regression equation and corresponding related coefficient (R2). The results showed that the concentration of protein and P/P exhibit obvious direct proportion to Dp with the higher value of R2 being 0.5367 and 0.4298, respectively. As a hydrophobe, protein is prone to sediment on the membrane surface, forming secondary adsorption and increasing Dp. There is no obvious relation between polysaccharide concentration and Dp, which may be ascribed to the high concentration of polysaccharide in simulative domestic wastewater and its sediment as well as physical adsorption. Based on the present result, the protein is taken as the most significant factor for the fouling, changing the interaction between protein and membrane can alleviate it.

Key words: extracellular polymeric substance, transmembrane pressur, protein, polysaccharide

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