三价铁对藻菌共生体在养殖废水处理中膜污染的影响  

Effect of Fe^(3+)on Membrane Fouling in Microalgae-Bacteria Consortia for Swine Wastewater Treatment

作　　者：孙晨 高梦嘉 陈姝灿 丁梓尧 罗娜 王锌针 熊川懿 田茂芝 李昆[1] SUN Chen;GAO Meng-jia;CHEN Shu-can;DING Zi-yao;LUO Na;WANG Xin-zhen;XIONG Chuan-yi;TIAN Mao-zhi;LI Kun(Key Laboratory of Poyang Lake Environment and Resources Utilization,School of Resource&Environment,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学资源与环境学院、鄱阳湖环境与资源利用教育部重点实验室,江西南昌330031

出　　处：《中国给水排水》2023年第17期18-25,共8页China Water & Wastewater

基　　金：江西省自然科学基金资助面上项目(20212BAB203035);国家自然科学基金资助项目(51768043);江西省研究生创新专项资金资助项目(YC2021-S128)。

摘　　要：将电场预处理与藻菌共生-膜耦合技术用于畜禽养殖废水处理可实现对碳、氮、磷的高效去除,但膜污染是制约其应用的主要因素之一。基于电场预处理残留铁离子对藻菌共生体膜污染的影响展开研究,通过在藻菌共生体及其分泌的胞外聚合物(EPS)拆分的各组分中加入铁离子使其浓度分别达到15、40、60、150 mg/L,分析铁离子与EPS各组分相互作用对膜污染的贡献和作用机制。结果表明,铁离子对膜污染的影响存在临界点,当铁离子浓度低于临界点时膜污染减轻,反之则膜污染加剧,推测铁离子浓度临界值在40~60 mg/L之间。造成膜污染的是EPS的主要成分酪氨酸类蛋白质,且对膜污染贡献组分最大的是溶解性微生物产物(SMP),SMP与铁离子的结合能力强于其他组分,是EPS膜污染的主要贡献者。铁离子的加入对SMP、微生物絮体(MFR)的完全堵塞模型拟合度影响最大,其拟合R2值变化高达0.3241和0.3711。而在松散附着型胞外聚合物(LBEPS)、紧密结合型胞外聚合物(TB-EPS)中则是对完全堵塞和标准堵塞影响最大,同时也对膜面污染物的分布产生了影响。The application of electric field pretreatment and microalgae-bacteria consortiamembrane coupling technology in swine wastewater treatment can achieve efficient removal of carbon,nitrogen and phosphorus,but membrane fouling is one of the main problems restricting its application.Based on the effect of residual iron ions in electric field pretreatment on membrane fouling,iron ions were added to the components of microalgae-bacteria consortia and their secreted extracellular polymeric substances(EPS)to reach the concentrations of 15 mg/L,40 mg/L,60 mg/L and 150 mg/L,respectively and the contribution and mechanism of the interaction between iron ions and EPS components to membrane fouling were studied.The results showed that there was a critical point for the effect of iron ions on membrane fouling.When the iron ion concentration was lower than the critical point,the membrane fouling was reduced,and vice versa.It was speculated that the critical value of iron ion concentration should be between 40 mg/L and 60 mg/L.The reason for membrane fouling was the main component of EPS,tyrosine proteins,and the largest contributor to membrane fouling was soluble microbial products(SMP).The binding ability of SMP to iron ions was stronger than other components,which was the main contributor to EPS membrane fouling.The addition of iron ions had the greatest influence on the fitting degree of the complete clogging model of SMP and microbial flocs(MFR),and the fitting R^(2) values were 0.3241 and 0.3711.For loosely bound extracellular polymer(LB-EPS)and tightly bound extracellular polymer(TB-EPS),it had the greatest influence on complete blockage and standard blockage models,and also affected the distribution of pollutants on the membrane surface.

关 键 词：铁离子 藻菌共生体 膜污染 胞外聚合物 畜禽养殖废水 

分 类 号：TU992[建筑科学—市政工程]