UASB反应器对芳香族化合物反硝化降解特性研究_全向春

第2卷第12期环境工程学报Vol.2,No.122008年12月ChineseJournalofEnvironmentalEngineeringDec.2008UASB反应器对芳香族化合物反硝化降解特性研究全向春王文燕杨志峰何孟常(北京师范大学环境学院水环境模拟国家重点实验室,北京100875)摘要以苯、联苯和萘为模型化合物,研究了上流式厌氧污泥床反应器(UASB)在反硝化连续流运行条件下对含上述污染物废水的处理效果,并以葡萄糖为补充碳源,考察了COD/NO-3-N(简称C/N)比对有机物反硝化降解特性的影响。研究结果表明,当进水COD浓度约为900mg/L,苯、联苯和萘总浓度约为60mg/L,NO-3-N为20～60mg/L时,UASB反应器能够在硝酸盐还原条件下稳定去除废水中有机污染物,其中COD平均去除率可达到85%,苯、萘和联苯平均去除率分别为90%、81%和71%。3种芳香烃反硝化降解速率顺序为苯>萘>联苯。C/N比对苯的降解影响不十分显著,在C/N为5～30范围内,苯的去除率稳定在87%～92%;萘和联苯去除率受C/N影响较大,在C/N比为15时萘和联苯的去除率均达到最大,分别为82%和77%。关键词反硝化UASB反应器降解苯萘联苯中图分类号X703.1文献标识码A文章编号1673-9108(2008)12-1589-05BiodegradationofaromatichydrocarbonsinanUASBreactorunderdenitrifyingconditionsQuanXiangchunWangWenyanYangZhifengHeMengchang(StateKeyLaboratoryofWaterEnvironmentalSimulation,SchoolofEnvironment,BeijingNormalUniversity,Beijing100875)AbstractWithbenzene,naphthaleneandbiphenylasmodelaromatichydrocarbons,treatmentofwastewatercontainingabovearomatichydrocarbonswasstudiedinanupflowanaerobicsludgebed(UASB)reac-toroperatedundercontinuousmodeanddenitrifyingconditions,andtheinfluenceofCOD/NO-3-N(C/N)ratioontheremovaloforganicpollutantswasalsoinvestigatedwithglucoseasthesupplementedcarbonsource.Re-sultsshowedthattheUASBreactorcoulddegradethesearomatichydrocarbonseffectively,withinfluentCODconcentrationatabout900mg/L,totalconcentrationofbenzene,naphthaleneandbiphenylatabout60mg/L,andinfluentNO-3-Nconcentrationranged20～60mg/L.TheaverageremovalrateofCODwas85%,andthatofbenzene,naphthaleneandbiphenylwas90%,81%and71%,respectively.Biodegradationabilityofthethreearomatichydrocarbonsfollowedtheorder:benzene>naphthalene>biphenyl.C/Nratiodidnothaveobvi-ouseffectsontheremovalofbenzene,87%～92%removalefficiencywasachievedforbenzenewithC/Nranged5～30.However,theremovalofnaphthaleneandbiphenylwasgreatlyinfluencedbyC/Nratio,thehighestre-movalrateof82%and77%wasachievedatC/N=15.Degradationofthethreearomatichydrocarbonsfollowedtheorder:benzene>naphthalene>biphenyl.Keywordsdenitrification;UASBreactor;degradation;benzene;naphthalene;bi