水中安乃近高级氧化法去除及其产物的毒性评价
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2020-04-07 20:58:12
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中国环境科学2009,29(9):967-971ChinaEnviromnentalScience水中安乃近高级氧化法去除及其产物的毒性评价童君,熊振湖(天津城市建设学院环境与市政工程系,天津300384)摘要:在实验室规模下,利用uV、H2O2、UV/H2O2、Fenton和UV/Fenton等高级氧化技术降解安乃近并对其降解产物进行毒性评价.在对各参数(pH值、H2O2投加量、Fe投加量、光照时间)优化的基础上,用TOC去除率和降解率对降解效果进行评价.安乃近及其光催化降解中间产物在水溶液中的毒性通过其对普通小球藻的生长抑制作用评价,并以96h的半数效应浓度(EC50)表示.结果表明,UV/Fenton对安乃近的降解率最大(96%),最佳降解条件为pH3,Fe2+、H202浓度分别为2,140mg/L.初期降解产物的生物毒性比母体化合物大,其EC5(}达到最小值(13.65mg/L),随降解时间的延长,ECs0值逐渐增大,在180min为44.07mg/L,,J、球藻生长状况良好,表明含低浓度安乃近的水溶液经过UVen幻n法处理后对水中生物已不具有危害作用.关键词:安乃近;高级氧化法;毒性效应;普通小球藻中图分类号:X703.1文献标识码:A文章编号:1000—6923(2009)09-0967—05Degradationofdipyroneinwaterbyadvancedoxidationprocessesandevaluationofthetoxicityforthedegradationproducts.TONGJun,XIONGZhen—hu。(DepartmentofEnvironmentalandMunicipalEngineering,TianjinInstituteofUrbanConstruction,Tianjin300384,China).ChinaEnvironmentalScience,2009,29(9):967~971Abstract:DipyronewasdepredatedbyUV,H202,UV/I-I202,Fenton,UV/Fentonandotheradvancedoxidationprocessinthelaboratoryscale,andthetoxicityofthedegradationproductswasevaluated.Onthebasisofoptimizedparameters(pU,H202dosage,Fedosage,illuminationtime),thedegradationefectwasevaluatedusingremovaleffectofTOCanddegradationofdipyrone.ThetoxicityofdipyroneanditsphotocatalyticintemaediatesinaqueoussolutionwereassessedbythegrowthinhibitionofChlorellavulgarisandWasshowedbythe96hhalfefectofconcentration(EC5o).ThedegradationefectofUV/Fentonfordipyronewasmosteficient,theoptimizedparameterswerepH3,Fe2mg/LandH202140mg/L.BiologicaltestshowedthattheintermediateswereofmoretoxicitythanthematrixcompoundbecausetheEC50valuewasminimum(13.65rag/L)whenthereactiontimereached30min.WiththereactiontimeincreasedthevalueofECs0graduallyincreased,andreached44.07mg/Lat180min,andthechlorellaWasgrewwellingoodcondition,whichshowingthatphoto—Fentonreactionwasfitfordegradationoflowconcentrationsofdipyroneinaqueoussolutionandthetreatedwaterdidnthavebiologicaltoxicityforchlorella.Keywords:dipyrone;advancedoxidationprocesses;toxicologicalefect;Chlorellavulgaris近年来,由于药物和个人护理用品(PPCPs)的使用量激增,水
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