混凝_超滤工艺处理滦河水的中试研究_何文杰

混凝—超滤工艺处理滦河水的中试研究何文杰1,2,顾金辉1,康华3,李玥1,王胜江1,卜建伟4(1.天津城市建设学院环境与市政工程系,天津300384;2.天津市自来水集团有限公司,天津300040;3.哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090;4.西安建筑科技大学环境与市政工程学院,陕西西安710055)摘要:采用混凝—超滤工艺进行了处理滦河水的中试研究,考察了混凝剂投量和混凝反应时间对膜出水水质及跨膜压差的影响。结果表明,在三氯化铁投量为6mg/L、混凝反应时间为7.5min时,系统对污染物的去除效果较好,对CODMn的去除率为48.7%,膜出水的CODMn<2.0mg/L,浊度<0.1NTU;此时的跨膜压差相对较小且随运行时间增长缓慢。在高温、高藻期,预氯化有助于提高系统对有机物的去除率并可减缓膜污染;EFM清洗方式可使膜系统长时间在较低的跨膜压差下运行,是延缓膜污染的有效手段。关键词:超滤;混凝;预氯化;膜污染;EFM中图分类号:TU991.2文献标识码:C文章编号:1000-4602(2007)09-0073-04基金项目:天津市科技创新专项基金资助项目(05FZZDSH00500)Pilot-scaleStudyonCoagulation/UFforTreatingLuanRiverWaterHEWen-jie1,2,GUJin-hui1,KANGHua3,LIYue1,WANGSheng-jiang1,BUJian-wei4(1.DepartmentofEnvironmentalandMunicipalEngineering,TianjinInstituteofUrbanConstruc-tion,Tianjin300384,China;2.TianjinWaterworksGroupCo.Ltd.,Tianjin300040,China;3.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China;4.SchoolofEnvironmentalandMunicipalEngineering,Xi'anUniversityofArchitectureandTechnology,Xi'an710055,China)Abstract:Ahybridprocessofcoagulation/ultrafiltrationmembranefortreatmentofLuanRiverrawwaterwasinvestigatedinapilot-scaletest.TheeffectsofcoagulantdosageandcoagulationreactiontimeonthemembranefiltrationwaterqualityandTMPwerestudied.TheresultsshowthatwhenFeCl3dosageis6mg/Landcoagulationreactiontimeis7.5min,theprocessiseffectiveinremovalofpollu-tants,withCODMnremovalrateof48.7%,CODMnoflessthan2.0mg/Linthemembranefiltrationwaterandturbidityoflessthan0.1NTU.Atthesametime,theTMPisrelativelylowandincreasesslowly.Intheperiodofhightemperatureandalgae,prechlorinationcanincreasetheremovalrateoforganicmatterandreudcethemembranefouling.Thecleaningoperationwithenhancedfluxmaintenance(EFM)allowsthemembranetorunforlongtimeunderlowerTMPandisaneffectivemethodtoreducethemembranefouling.Keywords:ultrafiltration;coagulation;prechlorination;membranefouling;enhancedflux·73·第23卷第9期2007年5月中国给水排水CHINAWATER＆WASTEWATERVol.23No.9May2007maintenance对于微污染源水,单纯采用超滤膜处理,其出水水质难以达标,而将混凝作为超滤的预处理工艺可有效提高其对有机物的去除率并减缓膜污染[1]。笔者采