FeSO4和PFS对膜生物反应器运行及膜污染特性的影响  

Effect of FeSO4 and PFS on membrane bioreactor operation and membrane fouling characteristics

作　　者：胡环 晏晓敏 舒月红[1] 李来胜[1] HU Huan;YAN Xiaomin;SHU Yuehong;LI Laisheng(School of Environment,South China Normal University,Guangzhou 511400,China)

机构地区：[1]华南师范大学环境学院,广州511400

出　　处：《环境工程学报》2020年第12期3363-3371,共9页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07202004)。

摘　　要：采用一体浸没式膜生物反应器(MBR)处理模拟生活污水,考察了在投加不同铁盐絮凝剂(FeSO4和PFS)条件下反应器的运行效率及膜污染特性。进出水水质分析结果表明:铁盐絮凝剂的投加可明显提高MBR的除磷效率,反应器总磷的平均去除率由20.23%分别提高至74.29%和81.09%,对COD和氨氮的去除率没有明显的影响;污泥沉降得到改善,SVI明显降低,使泥饼层更加疏松,易于清洗。同时通过对不同絮凝剂条件下污泥混合液胞外聚合物以及膜上污染物的三维荧光分析,发现絮凝剂的加入能明显减少胞外聚合物中的多糖浓度以及膜上污染物质的结构类型,且主要减少了胡敏酸类物质对膜的污染。这对于提高出水水质,减缓膜污染具有重要意义。以上结果可为FeSO4和PFS在MBR中的应用提供参考。An integrated submerged membrane bioreactor(MBR)was used to treat simulated domestic sewage,and the operating efficiency and membrane fouling characteristics of the reactor under the conditions of adding different iron salt flocculants(FeSO4 and PFS)were investigated.Quality of the influent and effluent showed that the addition of the iron salt flocculant significantly improved the phosphorus removal efficiency by MBR,and the average removal rate of total phosphorus by MBR increased from 20.23%to 74.29%and 81.09%,respectively,while had no significant impact on the removal of COD and NH3-N.Activated sludge settlement was improved,the SVI was significantly reduced,which resulted in looser and easy-cleaning cake layer on membrane.Three-dimensional fluorescence analysis on the extracellular polymer of the sludge and the membrane pollutants under different flocculant conditions showed that the dosing of flocculants could significantly reduce the polysaccharide concentration in extracellular polymers and the structure type of pollutants on the membrane,and mainly reduced the pollution effects of humic acids on the membrane.It is of great significance for improving effluent quality and relieving transmembrane pollution.The result can provide reference for application of FeSO4 and PFS in MBR.

关 键 词：膜生物反应器 絮凝剂 除磷 膜污染 

分 类 号：X703[环境科学与工程—环境工程]