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《驯化污泥系统论文：驯化污泥系统处理双酚a废水过程中污泥有机毒性分布规律研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、驯化污泥系统论文：驯化污泥系统处理双酚A废水过程中污泥有机毒性分布规律研究【中文摘要】剩余污泥的土地利用已经成为其重要的资源化方向,然而污泥的毒性积累已成为对后续资源化利用的最关键限制因素,基于这一问题,本试验在小试规模下,以处理疏水性毒性有机物双酚A(BPA)的活性污泥系统为对象,考察污泥有机毒性的形成过程及空间分布特性,为源头或后续消减有机毒性的资源化处理与处置提供理论指导。本试验用2.5mg/L的BPA模拟废水对SBR活性污泥系统驯化处理,随后驯化污泥运行阶段对BPA浓度分别为5mg/L.7.5m
2、g/L.20mg/L40mg/L的模拟废水进行处理,同时监测各阶段浓度梯度出水COD,水相与泥相(外层胞外多聚物(EPS)和内层EPS+胞内)BPA浓度及毒性的变化趋势；单个周期内,水相COD、水泥两相BPA浓度及毒性随反应时间的变化趋势；探讨了空白组灭活污泥、空白组未灭活污泥和对照组未灭活污泥三种污泥对BPA吸附降解路径及毒性变化趋势。研究表明,驯化污泥对含BPA废水去除效果比未驯化污泥好,且经驯化的污泥所能承受的BPA废水浓度更高,主要体现为快速吸附后降解去除；在BPA降解过程中,外层EPS区域(占
3、泥相体积百分数22.27%)没有BPA及毒性的积累;在驯化与运行过程中,驯化污泥内层EPS+胞内区域没有BPA残留,但毒性不断积累,这是因为BPA毒性降解产物或者BPA诱导微生物细胞分泌的毒性物质,滞留在内层EPS+胞内而引起。吸附与降解均可造成显著毒性,在每个运行周期末,对照组污泥系统毒性积累主要为有毒降解产物引起。【英文摘要】Landutilizationofexcesssludgehasbecomeavitalwayofresourcerecovery.However,thetoxicityofs
4、ludgehasbecomethemostcriticalrestrictionforsubsequentreuse.Baseonthisissue,Laboratory-scalebatchexperimentswereconductedtoinvestigatetheformationprocessandspatialdistributioncharacteristicsoforganictoxicityinacclimatedsludgetreatingthehydrophobictoxicorg
5、anic(BPA).toprovidetheoreticalbasisforthereductionoforganictoxicityinsituorsubsequentdisposal.ThereactorwasoperatedinasSBR.acclimatedwithsyntheticwastewatercontaining2.5mg/LBPA.TheinfluentconcentrationofBPAwas5mg/L.7.5mg/L.20mg/Land40mg/Lrespectively.The
6、effluentCOD.concentrationofBPAinwaterandsolidphases(outerEPSandinnerEPS+intracellular)andorganictoxicitywereanalyzedineverystage.TheeffectofretentiontimeoneffluentCOD.concentrationofBPAinwaterandsolidphases(outerEPSandinnerEPS+intracellular)andorganictox
7、icityinasinglecyclewerealsoanalyzed.Inaddition,thevariationoftoxicitycausedbyadsorptionordegradationinunacclimatedinactivatedsludge,unacclimatedactivatedsludgeandacclimatedactivatedsludgewereanalyzed.TheresultshowedthatBPAremovalefficiencyofacclimatedact
8、ivatedsludgeisbetterthanthatofunacclimatedactivatedsludge.TheremovalprocessofBPAintheactivatedsludgesystemwascharacterizedbyaquickadsorptionontheactivatedsludgeandsubsequentbiodegradation.Intheprocessofbiodegradation.noacc
