化学沉淀-微滤-络合-超滤处理高浓度含镍废水

中国环境科学2016，36(4)：1106-1111ChinaEnvironmentalScience化学沉淀一微滤一络合一超滤处理高浓度含镍废水张学俊，曾坚贤，张鹏，申少华，易良刚，田俊，李敏(湖南科技大学化学化工学院湖南湘潭411201)摘要：在pH=9下，镍离子浓度为5562．71mg／L的镍废水经充分沉淀后，以0．5Inn孔径陶瓷膜微滤处理，发现浓缩时膜通量∽先快速降低，经缓慢下降后，再较快降低，镍截留系数(RNj)接近l，当体积浓缩因子(VCF)从1增大到lO时，截留液镍浓度(从5562．71mg／L浓缩至55507．76rngrL，渗透液镍浓度(Cp)913．26mWL．以陶瓷膜渗透液为料液，以聚乙烯亚胺为络合剂，考察聚合物与金属质量比(，m)、pH值、温度和操作压力对恒容超滤i和的影响，并研究超滤浓缩过程．结果表明』i随rp／m或pH增大而增大，随温度升高而略下降，与操作压力无关随温度或操作压力增大而增大，随pH增大而增大至不变，，m对，影响甚微．超滤浓缩时，控制=7和pH=9，当VCF从1增大到3O时仅下降9．76％，G从13．26mg／L增大至396．64mg／L，约O．04mg／L，镍离子被浓缩，超滤渗透液可直接排放．关键词：陶瓷膜；微滤；络合；超滤；镍离子中图分类号：X703．5文献标识码：A文章编号：1000—6923(2016)04—1106—06TreatmentofwastewatercontaininghighconcentrationnickelionswithpreeipRation·-microfitration··complexation—ultrafiltrationprocesses．ZHANGXuejun，ZENGJian-xiarl’，ZHANGPeng，SHENShao—hua，YILiang-gang，TIANJun，LIMin(CollegeofChemistryandChemicalEngineering，HunanUniversi够ofScienceandTechnology,Xiangtan411201，China)．ChinaEnvironmentalScience，2016，36(4)：1106~1l1lAbstract：Thewastewatercontaininghighconcentration(5562．71mg／L)ofnickelionwasfirstcompletelyprecipitatedatpH9．andsubsequentlytreatedbyaceramicmicrofiltrationmembranewithaporediameterof0．5p,m．Duringtheconcentrationprocess，themembraneflux∽droppedsignificantlyattheinitialstage，thendeclinedslowly,andfinallydecreasedatarapidrateagain．Thenickelrejectioncoeficient(RNi)wasfoundtobeapprox．1．Whenthevolumeconcentrationfactor(VCF)increasedfromlto10，thenickelconcentrationintheretentate(coincreasedfrom5562．71to55507．76mg／L，whereasthenickelconcentrationinthepermeate(CD)remainednearlyconstantatapprox．13．26mg／L．Then，thecomp|exation-ultrafiltrationprocesswasstudiedusingthepermeationfluidfromthemicrofiltrationprocessasthefeedsolution．Poly(ethyleneimine)Wasemployedasthecomplexingagent．Theefectsofthepolymer／metalmassratio(，D／瑚)，pH，temperatureandoperatingpressureonRNiandJwereinvestigated．Further，theprocessofultrafiltrationconcentrationwasstudied．TheresultsshowedthatRNiincreasedwithincreasing，morpHanddecreasedslightlywithtemperature，andthattheoperatingpressu