一体化改性膜生物反应器处理城市污水的效果  

Integrated Modified Membrane Bioreactor for Municipal Wastewater Treatment

作　　者：魏永[1] 陈雪丹[1] 董良飞[1] 

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《中国给水排水》2014年第1期6-9,共4页China Water & Wastewater

基　　金：常州市社会发展科技支撑课题(CE20115017);常州大学校级基金资助项目(ZMF1102083)

摘　　要：利用亲水性的纳米TiO2对强疏水性的聚偏氟乙烯膜进行改性以减缓膜污染,并应用于膜生物反应器(MBR)。原水来自常州市某城市污水厂,经加装改性和未改性膜组件的MBR处理后出水水质均能达到GB 18918—2002中的一级A标准。尽管进水COD浓度不稳定,但两套膜组件对COD的去除率均保持在85%以上,改性膜组件对COD的平均去除率更高,可达94%;对SS的去除率几乎能达到100%;在对TN和TP的去除上,改性膜组件略有优势,但不明显,这是因为N、P的去除主要依靠微生物的降解作用,膜的分离作用不大。在运行一段时间后,两套膜组件的膜通量均有所下降,经在线反冲洗及化学清洗后,通量均有所恢复,分别为73%和78%。对比处理出水水质及抗污染能力,改性膜组件均优于未改性膜组件。Strongly hydrophobic polyvinylidene fluoride （PVDF） membrane was modified by hydrophilie nanometer TiO2 to alleviate membrane fouling in MBR. The raw wastewater was taken from a wastewater treatment plant in Changzhou City. After being treated by MBRs with modified or unmodified membrane modules, the respective effluent quality met the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002 ）. Although the influent COD concentration was unstable, the removal rates of COD by the unmodified and modified membrane modules were 〉 85% and 〉94% , respectively. The SS removal rate was almost 100%. The mod- ified membrane module had a slight but non-significant advantage over the unmodified membrane module in TN and TP removal because N and P removal relied mainly on microbial degradation while the membrane separation technology seldom contributed to N and P removal. The membrane fluxes of the two sets of membrane modules both declined after a period of operation time, and recovered by 73% and 78% , respectively, after the online backwashing and chemical cleaning. Both in terms of the effluent quality and membrane antifouling ability, the modified membrane module was better than the unmodified module.

关 键 词：膜生物反应器 TIO2 改性 膜通量 

分 类 号：X703[环境科学与工程—环境工程]