微生物本身对超滤膜污染的影响因素研究  

Impact factors on ultrafiltration membrane fouling by microbial particles

作　　者：高伟[1] 梁恒[2] 李圭白[1,2] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [2]城市水资源开发利用(北方)国家工程研究中心,哈尔滨150090

出　　处：《给水排水》2013年第5期115-119,共5页Water & Wastewater Engineering

基　　金：佛山市院市合作项目(2011BY100291);禅城区产学研项目(2011B1031)

摘　　要：为了研究微生物本身对超滤膜污染的影响因素及其污染的可逆性,系统考察了进水浓度、pH、离子强度、钙离子浓度等溶液组成对微生物本身造成超滤膜污染的影响,并分析了膜污染层分布对膜比通量下降的贡献度。结果表明,随着进水浓度的升高,膜的可逆和不可逆污染明显加重,当微生物浓度超过50 mg/L时开始出现不可逆膜污染;钙离子的存在可能是通过架桥作用增大了微生物在膜表面的沉积,从而形成不可逆污染层,进而加重膜污染;碱性条件(pH为10)会加重浓差极化层对膜比通量下降的贡献,而酸性条件(pH为4)则加重不可逆污染层的贡献;离子强度的增大通过对可逆污染层的控制减缓了膜污染,但其对不可逆污染层的控制不利。To systematically study the impact factors on ultrafiltration （UF） membrane fouling by microbial particles, the effects of feed concentration, pH,ionic strength and Ca2＋ concentration on initial UF membrane fouling were investigated, and the reversibility of membrane fouling under various conditions was also analyzed. It was found that both reversible and irreversible fouling in- creased while increasing the feed concentration and irreversible fouling appeared when feed concen- tration exceeded 50 mg/L. Calcium might bring more severe irreversible fouling by bridging effect; the alkaline environment （pH=10） increased concentration polarization effect, while the acid environment （pH=4） increased irreversible fouling layer. Increasing ionic strength could slow down the membrane fouling rate, but it would have detrimental influence on the irreversible fouling layer.

关 键 词：微生物 超滤膜 生物污染 可逆性溶液环境 

分 类 号：O646.23[理学—物理化学]