碱性条件下UV_Fe_EDTA_H_2O_2预处理皮革废水_周作明

PretreatmentoftannerywastewaterbyUV/Fe-EDTA/H2O2processunderalkalineconditionsZhouZuoming，DongMeixia，LiTianpeng，JingGuohua（DepartmentofEnvironmentalEngineering，HuaqiaoUniversity，Xiamen361021，China）碱性条件下UV/Fe-EDTA/H2O2预处理皮革废水周作明，董梅霞，李天鹏，荆国华（华侨大学环境工程系，福建厦门361021）［摘要］采用UV/Fe-EDTA/H2O2体系预处理皮革废水，考察了初始pH、反应时间、H2O2和Fe-EDTA投量对COD去除率的影响，测定了处理过程中B/C变化，同时与UV/Fenton法进行了比较。结果表明：UV/Fenton法的最佳工艺条件为FeSO425mmol/L、H2O2300mmol/L、pH=5。加入EDTA后，反应的最佳初始pH碱移，UV/Fe-EDTA/H2O2体系于pH为8.0时，反应10minCOD去除率可达51.9%，而pH为5.0时UV/Fenton体系处理10min后COD去除率仅37.9%。对比降解效果，UV单独作用效果不理想，60min后COD去除率仅25%。引入UV后，Fenton法处理效果提高，60min后COD去除率由37.0%提高至59.3%，加入EDTA后最终COD去除率与UV/Fenton法接近。经光照处理的废水B/C呈先降后升趋势，经UV/Fenton处理后，原水B/C由0.3提高至0.35，经UV/Fe-EDTA/H2O2处理的废水最终B/C略有降低。［关键词］光氧化技术；皮革废水；可生化性［中图分类号］X703.1［文献标识码］A［文章编号］1005-829X（2009）09-0058-05Abstract：AnadvancedoxidationprocessapplyingEDTAinUV/Fentonsystemhasbeenusedfordegradingthepollutantscontainedintannerywastewater.TheeffectofinitialpH，H2O2andFe-EDTAdosageareinvestigatedandthebiodegradabilitychangesofthepretreatmentsystemofUV/FentonandUV/Fe-EDTA/H2O2arecompared.Theresultsshowthatthebestconditionsareasfollows：FeSO425mmol/L，H2O2300mmol/L，pH=5.AfteraddingEDTA，thebestinitialpHmovestowardsalkaline.WhenthepHis8.0，UV/Fe-EDTA/H2O2reactsfor10min，theCODremovalratecanreach51.9%，whilethepHis5.0，afterbeingtreatedbyUV/Fentonprocessfor10min，theCODremovalrateisonly37.9%.Variousdegradingefficienciesarecompared.TheresultsshowthatwhenUVisusedalone，theresultisnotsogood.After60min，theCODremovalrateisonlyaround25%.AfterintroducingUV，thetreatmentefficiencyofFentonprocessisobviouslyimproved：in60minincreasingfrom37%to59.3%.AfteraddingEDTA，thefinalCODremovalrateissimilartotheefficiencyofUV/Fentonprocess.TheradiatedwastewaterB/Cappearsincreasingfirstthendecreasingafterwards.AfterbeingtreatedbyUV/Fentonprocess，therawwaterimprovesfrom0.3to0.35.AfterbeingtreatedbyUV/Fe-EDTA/H2O2，itdeclinesalittle.Keywords：photooxidationprocess；tannerywastewater；biodegradability［基金项目］福建省科技计划重大基金项目（2005HZ03-3）；福建省自然科学基金项目（