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1、环境科学研究第19卷第1期ResearchofEnvironmentalSciencesVol.19,No.1,2006光电催化氧化处理高含氯采油废水的研究3李桂英,安太成,陈嘉鑫,陈繁忠,傅家谟,盛国英,叶恒鹏(中国科学院广州地球化学研究所有机地球化学国家重点实验室广东省环境资源利用与保护重点实验室,广东广州510640)摘要:以高压汞灯为光源,考察了在光催化、电氧化、光电催化及光电催化PH2O2体系中降解实际油田采油废水的效率.研究了实际高含氯采油废水在TiO2悬浮态光电催化反应器中的降解动力学.结果表明,在
2、相同的槽电压和反应时间下,光电催化体系降解有机污染物的效率均高于电化学氧化和光催化,而且在电氧化和光电催化氧化体系中均检测到有一定量的活性氯产生,从而可以提高有机污染物的降解效率.光电催化PH2O2体系中由于在紫外光的照射下H2O2分解为大量的·OH从而使得降解效率在短时间内大大提高.同时详细研究了采油废水的初始ρ(CODCr),槽电压和溶液pH等对光电催化降解的影响.关键词:光电催化;光催化;采油废水;水处理;CODCr中图分类号:X7411031文献标识码:A文章编号:1001-6929(2006)01-00
3、30-05PhotoelectrocatalyticDegradationofOilfieldWastewaterwithHighContentofChlorineLIGui2ying,ANTai2cheng,CHENJia2xin,CHENFan2zhong,FUJia2mo,SHENGGuo2ying,YEHeng2peng(StateKeyLaboratoryofOrganicGeochemistry,GuangdongKeyLaboratoryofEnvironmentalResourcesUtiliza
4、tionandProtection,GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China)Abstract:ThephotoelectrocatalyticdegradationofoilfieldwastewatercontaininghighcontentofchlorinewasstudiedinTiO2aqueoussuspensions.Theeffectofdifferentdegradation
5、technologies,suchasphotocatalysis,electro-oxidation,photoelectrocatalysisandphotoelectrocatalysisPH2O2,ontheCODCrremovalefficiencyofoilfieldwastewaterwascompared.TheresultsshowedthatCODCrremovalefficiencyofphotoelectrocatalysiswasmuchhigherthanphotocatalysisa
6、ndelectro2oxidationalone.Itisalsointerestingtonotethatacertainamountofactivechlorinewasproducedandhadanobviousenhancementeffectonbothelectro2oxidationandphotoelectrocatalyticdegradationofoilfieldwastewater.TheCODCrremovalefficiencyofphotoelectrocatalysisPH2O2
7、wasthehighest,andmuchoforganicpollutantswerecompletelymineralizedinashortperiodinthatH2O2caneasilyproduce·OHradicalunderUVirradiation.Theeffectsofvariousoperatingconditions,suchasinitialconcentrationofwastewater,appliedcellvoltageandinitialpH,werealsoinvestig
8、atedindetail.ItwasshownthatthedegradationefficiencyofoilfieldwastewaterwouldbecomparativelylowwheninitialconcentrationofCODCristoohighortoolow,andthatthedegradationefficiencyincreasedwith
