柠檬酸盐强化UVFenton-生物法处理乳化油废水

中国环境科学2011,31(3)：367~370ChinaEnvironmentalScience柠檬酸盐强化UV/Fenton-生物法处理乳化油废水李继*,吕小梅,张萍(哈尔滨工业大学深圳研究生院环境科学与工程研究中心,广东深圳518055)摘要：以乳化油配水为对象,研究了柠檬酸盐扩大UV/Fenton工艺的适用pH值范围与强化出水可生化性及与活性污泥法联用的效果.结果表明,柠檬酸盐可将UV/Fenton法的适用pH值范围扩大至4~8,且能提高UV/Fenton处理出水的可生化性.UV/Fenton处理后,原水BOD5/COD由0.02提高到0.32,投加1.0mmol/L柠檬酸钠后提高至0.53.UV/Fenton处理与经1.0mmol/L柠檬酸钠强化UV/Fenton处理出水经8h生物处理,COD去除率分别为78.7%,96.0%.柠檬酸钠浓度从0增加至1.0mmol/L时,经UV/Fenton处理过的出水再经生物处理出水的COD由293mg/L降低至48mg/L;继续增大时,COD基本保持不变.柠檬酸钠强化UV/Fenton处理可扩大pH值范围,改善废水的可生化性.关键词：乳化油废水；UV/Fenton；柠檬酸盐；可生化性；生物处理中图分类号：X703.1文献标识码：A文章编号：1000-6923(2011)03-0367-04EmulsionwastewatertreatmentbycitrateenhancedUV/Fentonandcombinedwithbiologicaltreatment.LIJi*,LVXiao-mei,ZHANGPing(EnvironmentalScienceandEngineeringResearchCenter,HarbinInstituteofTechnologyShenzhenGraduateSchool,Shenzhen518055,China).ChinaEnvironmentalScience,2011,31(3)：367~370Abstract：IntheUV/Fentonprocess(UFP)treatingartificialemulsionwastewater,theeffectsofcitrateadditionontheapplicablepHrangeandeffluentbiodegradabilityweresystematicallyinvestigated.InthecitrateenhancedUV/Fentonprocess(CE-UFP),theapplicablepHrangewasbroadenedto4~8.WhenCE-UFPwascarriedoutunder1.0mMinitialcitrateconcentration,theeffluentBOD/CODratioincreasedto0.53,whichismuchhigherthanthatof0.32withnocitrateaddition.WhentheeffluentofCE-UFPandUFPwerefurtherseparatelytreatedwith8-hourbiologicaltreatment,therespectiveCODremovalefficiencieswere78.7.0%and96.0%.When0~1.0mMcitratewasdosedatCE-UFPstage,theeffluentCODaftersubsequentbiologicaltreatmentmaydecreasefrom293mg/Lto48mg/L,whilenofurtherdecreasewasobservedwithhighercitratedosage.AlltheseresultsclearlyindicatecitratecanbroadentheapplicablepHrangeofUFPandenhancethebiodegradability.Keywords：emulsionwastewater；UV/Fenton；citrate；biodegradability；biologicaltreatmentUV/Fenton技术由于氧化能力强,在难生物降解污染物的处理方面得到了较为广泛的应用[1-4].但是单独用于达标处理时,药剂消耗量较大,因此通常与其他处理工艺[5]组合,以提高处理效率、降低物耗和能耗.其中,UV/Fenton-生物法的成本相对较低,故应用较多[6-8].对于中性或碱性废水,还需在UV/Fenton反应前后反复调节pH值,增加了药剂费用.此外,UV/Fenton处理出水如果可生化性不高,会影响生物法处理效果.为解决以上问题,一些学