摘要
采用孔径90μm的尼龙筛网作为微网基材,建立动态膜生物反应器系统,用以处理模拟生活污水,并在不同容积负荷下运行3组动态膜生物反应器,研究反应器动态膜污染的特征与机理.结果表明:过大和过小的负荷均会增加膜污染,过小的曝气强度不能有效去除膜表面污染物,而过大的曝气强度会导致污泥絮体破坏,产生大量的胶体粒子和大分子有机物,使得膜通量下降;在较大曝气强度下,胶体粒子和溶解性有机物在膜表面及膜孔的沉积吸附是导致膜污染形成的根本原因.胞外聚合物含量和组成以及污泥黏度是影响动态膜生物反应器膜污染的主要因素.
Nylon screen mesh with mean pore size of 90 μm was used as filter cloth to develop a dynamic membrane bioreactor（DMBR） system for treating the synthetic municipal wastewater. The membrane fou-ling characteristics and mechanism in three parallel DMBRs operated under different aeration intensities was investigated. The results show that either small or large sludge load has negative influence on mem-brane permeability. The fouling cake layer can not be effectively removed with small aeration intensity. The large aeration intensity can result in a severe breakup of sludge floes to release vast colloidal and so-luble components and causes a rapid decrease of membrane permeability. The colloids and solutes are the key reasons for membrane fouling of DMBR with high aeration intensity. The content and composition of extracellular polymeric substances and the sludge viscosity have marked effect on the membrane fouling of dynamic membrane bioreactor.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2012年第5期596-600,共5页
Journal of Jiangsu University：Natural Science Edition
基金
江苏省自然科学基金资助项目(2010256)
关键词
动态膜生物反应器
污泥负荷
膜污染
胞外聚合物
污泥黏度
dynamic membrane bioreactor
sludge load
membrane fouling
extracellular polymericsubstances
sludge viscosity
