超声辐照_活性污泥联合处理焦化废水_宁平

超声辐照-活性污泥联合处理焦化废水宁平,徐金球,黄东宾,马晓利,徐晓军,李子燕(昆明理工大学环境科学与工程学院,昆明650093,E-mailningping58@sina.com)摘要:选取昆明焦化制气厂的实际焦化废水为处理对象,用水质模型对超声辐照-活性污泥法处理焦化废水中有机物的降解进行了研究.实验结果表明,焦化废水初始浓度、曝气方式和声能密度对焦化废水中CODCr的降解效果影响显著.对初始浓度为807mg/L的实际焦化废水,选择空气作为曝气气体,向废水中曝气而不超声时,废水中CODCr降解率仅为4.5%;在声能强度为119.4kW/m2条件下,超声时其降解率可达65%;采用超声辐照-活性污泥法联合处理焦化废水CODCr,与单独采用活性污泥法相比,废水的CODCr降解率可由单独采用活性污泥法的45%提高至81%;经超声波预处理后的废水,加活性污泥后,其耗氧速率有明显的降低,说明经超声波预处理后的焦化废水对生物无毒性.关键词:焦化废水;超声辐照;水质模型;活性污泥法中图分类号:X784文献标识码:A文章编号:0250-3301(2003)03-05-0065基金项目:国家教育部优秀年轻教师基金资助项目(2000E0061)作者简介:宁平(1958～),男,博士后,教授,博士生导师,主要从事环境污染控制技术研究.收稿日期:2002-05-31;修订日期:2002-07-12TreatmentofCarbonizationEffluentbytheUltrasonicRadiationandAc-tivatedSludgeProcessNingPing,XuJinqiu,HuangDongbin,MaXiaoli,XuXiaojun,LiZiyan(TheSchoolofEnvironmentalScienceandEngineering,KunmingUniversityofScienceandTechnology,Kunmimg650093,China)Abstract:Thepaperdealswiththedegradationoforganicpollutantsbytheultrasonicirradiation-activatedsludgepro-cess.ThetreatmentoftherealcokingwastewaterofKunmingcokemaking-gasplantwasstudiedwiththewaterqualitymodel.Usingtheultrasonicirradiation-activatedsludgeprocesstheorganicpollutantsintherealcokingwastewatercanbedegradedeffectively.Theinfluencefactorsoftheultrasonicdegradationeffectsuchasinitialconcentration,aeratedgasandultrasonicdensitywereinvestigatedandmechanismwasexplored.Theresultshowsthattheultrasonicdegrada-tioneffectwashighwiththedecreaseofinitialconcentrationoftheCODCr,thepresenceofaeratedgasandtheincreaseofultrasonicdensity.AttheinitialCODCrconcentrationof807mg/L,whenairactedasaeratedgasandonlyairitself(noultrasound)wasexertedonthewastewater,thedegradationrateoftheCODCrwillbe4.5%.However,whentheultrasoundoftheintensityof119.4kW/m2wasexertedonthewastewater,thedegradationrateoftheCODCrwillbe65%.Comparedwiththeactivatedsludgeprocessalone,thecombinationoftheultrasonicirradiationandactivatedsludgeprocesscanincreasethedegradationrateoftheCODCrfrom45%to81%.Theoxygenconsumptionrateofthecarbonizationeffluentobviouslydecreasedinthepresenceo