UV_NaClO高级氧化法降解再生水中磺胺甲恶唑

DOI:10.3785/j.issn.1008-973X.2019.01.021UV/NaClO高级氧化法降解再生水中磺胺甲恶唑杨海燕，叶桂洪，陈义华，李翼(北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室，中−荷污水处理技术研发中心，北京100044)摘要：为了提高再生水水质，采用UV/NaClO高级氧化法降解水中的磺胺甲恶唑（SMX），对比各种降解方法对SMX的去除效果，研究影响UV/NaClO降解SMX的因素，考察消毒副产物三氯甲烷（CHCl3）的产生情况，研究SMX在实际再生水中的去除效果.研究表明，UV/NaClO降解SMX的速率常数是单独UV、单独NaClO、UV/H2O23种处理方法的3.9、60、2.5倍，降解的最佳pH为3~8；NaClO投量会影响去除效果，在SMX初始浓度为1μmol/L，pH为7.4的条件下，最佳投量为0.1mmol/L；污水厂二级出水和水环境中普遍存在的腐殖酸会与SMX竞争活性自由基和光子，降低了SMX去除率；与单独NaClO处理相比，利用UV/NaClO工艺能够明显减少水中三氯甲烷的产生；SMX在实验室超滤机过滤后的自来水中的降解速率是在实际再生水中的6.8倍.关键词：UV/NaClO；磺胺甲恶唑（SMX）；降解速率；三氯甲烷（CHCl3）；再生水中图分类号：X703文献标志码：A文章编号：1008−973X（2019）01−0186−07DegradationofsulfamethoxazoleinreclaimedwaterbyUV/NaClOadvancedoxidationprocessYANGHai-yan,YEGui-hong,CHENYi-hua,LIYi(Sino-DutchR&DCenterforFutureWastewaterTreatmentTechnologies,KeyLaboratoryofUrbanStormwaterSystemandWaterEnvironment,MinistryofEducation,BeijingUniversityofCivilEngineeringandArchitecture,Beijing100044,China)Abstract:TheUV/NaClOadvancedoxidationprocesswasappliedtodegradesulfamethoxazole(SMX)inordertoimprovereclaimedwaterquality.TheeffectsofvariousdegradationprocessesonSMXremovalwerecompared.ThefactorsinfluencingthedecayofSMXbyUV/NaClOprocessandtheformationofdisinfectionby-productstrichloromethane(CHCl3)wereanalyzed.TheperformanceoftheUV/NaClOprocessfordegradingSMXinrealreclaimedwaterwasanalyzed.ResultsshowthatthedegradationrateconstantsofSMXinUV/NaClOprocesswasrespectively3.9,60and2.5timesfasterthanthemethodofUV,chlorinationaloneandUV/H2O2andthedegradationconductedbetteratpH3~8.TherateofSMXdegradationpeakedatoxidantdosageof0.1mmol/Lattheconditionsof1μmol/LSMXandpH7.4.Humicacid(HA)prevailinginsecondaryeffluentofwastewatertreatmentplantandwaterenvironmentdecreasedtheSMXdegradationbycompetingphotonsandactiveradicalswithtargetcontaminant.ThelessformationoftrichloromethanewasobservedinUV/NaClOprocesscomparedwithchlorinationalone.Thedegradationratesobservedinlaboratorylevelwas6.8timesthanthatinrealreclaimedwater.Keywords:UV/NaClO;sulfamethoxazole(SMX);degradationra