生活污水处理中胞外聚合物对膜污染的影响  

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

作　　者：马兴冠[1,2] 纪文娟[2] 孙俊平[2] 薛向欣[1] 杨合[1] 傅金祥[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110003 [2]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《过程工程学报》2012年第5期834-838,共5页The Chinese Journal of Process Engineering

基　　金：国家水体污染控制与治理重大科技专项基金资助项目(编号:2012ZX07505-002-02;2012ZX07505-004-01;2012ZX07208-012-05;2009ZX07208-002-005);住房和城乡建设部科技发展基金资助项目(编号:2011-k6-13)

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(Δp)的二项式非线性回归方程.结果表明,蛋白质和P/P对Δp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Δp的影响较小,R2为0.1185.多糖浓度对Δp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.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 （Ap） 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 Ap 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 Ap. There is no obvious relation between polysaccharide concentration and △p, 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.

关 键 词：胞外聚合物 膜压差 蛋白质 多糖 

分 类 号：X703[环境科学与工程—环境工程]