焦化废水外排水的TiO_2光催化氧化深度处理及有机物组分分析_肖俊霞

焦化废水外排水的TiO2光催化氧化深度处理及有机物组分分析肖俊霞,吴贤格肇庆学院化学化工学院,广东肇庆526061摘要:采用TiO2光催化氧化法对焦化废水外排水进行深度处理,考察反应时间,TiO2投加量及废水初始pH对TOC降解的影响,通过GCPMS技术对处理前后废水中的有机物组分进行定性分析,解析废水在TiO2光催化氧化过程中有机物的降解规律.结果表明:在反应时间为3h,TiO2投加量为4gPL,以及不调节废水pH的条件下,焦化废水外排水经TiO2光催化氧化深度处理后TOC的去除率为53140%,有机物种类由66种降为23种;TiO2光催化氧化法对除多环芳烃外的其他有机物均有较好的去除效果;不同种类有机物在TiO2光催化氧化过程中的降解速率为石油烃>醇、酸、醛等有机物>酚>苯系物>含氮杂环有机物>多环芳烃.关键词:焦化废水;TiO2光催化氧化法;深度处理;有机物中图分类号:X703文献标志码:A文章编号:1001-6929(2009)09-1049-07TiO2PhotocatalyticOxidationTreatmentandAnalysisofOrganicPollutantComponentsofDischargeWastewaterfromCokingWastewaterTreatmentStationXIAOJun-xia,WUXian-geSchoolofChemistryandChemicalEngineering,ZhaoqingUniversity,Zhaoqing526061,ChinaAbstract:TiO2photocatalyticoxidationwasusedtoperformtheadvancedtreatmentofdischargewastewaterfromacokingwastewatertreatmentstation.Theeffectsofreactiontime,TiO2dosageandinitialpHonTOCremovalrateofwastewaterweretested.TheGCPMStechniquewasusedtogiveaqualitativeanalysisofwastewaterbeforeandaftertreatment.ThedegradationregularityofwastewaterduringtheTiO2photocatalyticoxidationprocesswasanalyzed.Theresultshowedthatundertheconditionsofreactiontime3h,TiO2concentration4gPLandunadjustedwastewaterpH,theTOCremovalrateofthewastewaterwas53140%.Additionally,thenumberofspeciesoforganicmatterwasreducedfrom66to23inthewastewaterafterbeingtreatedbyTiO2photocatalyticoxidation.TiO2photocatalyticoxidationhadbetterremovalefficiencyfororganicpollutantswiththeexceptionofPAHs.DuringtheprocessofTiO2photocatalyticoxidation,thedegradationratesofdifferentorganicpollutantswereasfollows:petroleumhydrocarbon>alcohol,acid,aldehydeandotherorganicpollutants>phenols>benzenederivatives>nitrogenheterocycliccompounds>PAHs.Keywords:cokingwastewater;TiO2photocatalyticoxidationtechnology;advancedtreatment;organicpollutants收稿日期:2008-12-29修订日期:2009-03-19基金项目:广东省自然科学基金项目(8452606101000739)作者简介:肖俊霞(1978-),女,湖北天门人,讲师,博士,主要从事水处理高级氧化技术研究,xiaojunxia1103@163.com.焦化废水是煤高温干馏、煤气净化、副产品回收与精制过程中产生的工业有机废水,具有污染物浓度高、组分复杂、毒性大等特点,除了含有氨、氰、硫氰根、氟化物等无机污染物外,还含有酚、油、胺、萘、吡啶、喹啉、蒽等杂环及多