进料负荷调控培养好氧颗粒污泥的试验研究
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2020-04-03 16:48:36
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第28卷第5期2007年5月环境科学ENVIR0NMENTALSCIENCEVo1.28.No.5May,2007进料负荷调控培养好氧颗粒污泥的试验研究史晓慧,刘芳,刘虹,竺建荣(1.北京师范大学环境学院,北京100875;2.北京师范大学水环境模拟国家重点实验室,北京100875)摘要:采用厌好氧交替的SBR反应器,以进料负荷(即进水浓度)作为主要控制参数,研究了好氧颗粒污泥的关键培养技术.结果表明,在30min的较长污泥沉降时间下,通过进料COD0~900mg·L的负荷调控,可以有效控制反应器内污泥生长.初始接种污泥的沉降性能对颗粒污泥产生很重要,SVI值保持在20~50mg·L才能有助于颗粒污泥形成和培养.应用“空曝”这种强力负荷调控方式可大大改善污泥沉降性能,并促进颗粒污泥的形成.通过进料减负荷运行可很好实现污泥的“完全颗粒化”培养.颗粒化转变出现在进料浓度COD4O0—500mg·L‘。,污泥浓度约8~10g·L~.“完全颗粒化”污泥的性能优异,粒径约1.0mm,SVI值25—35mg·L~,最大沉降速率60m·h~.污泥颗粒过程的发生可能决定于SBR的独特间歇式运行,即基质浓度的贫富交替,减负荷运行可强化基质贫富交替并增大颗粒化过程的驱动力.关键词:好氧颗粒污泥;进料负荷;关键培养技术;污泥沉降性能中图分类号:X703.1文献标识码:A文章编号:0250.3301(2007)05.1026.07InvestigationofAerobicGranularSludgeCultivationbyFeedLoadingasaControlStrategySHIXiao-hui,LIUFang,LIUHong~,ZHUJian—rong(1.SchoolofEnvironment,BeringNormalUniversity,Beijing100875,China;2.StateKeyLaboratoryofWaterEnvironmentSimulation,SchoolofEnvironment,BeringNormalUniversity,Bering100875,China)Abstract:Thekeycultivationstrategyforaerobicgranularsludgecultivationwasinvestigatedusingfeedloadingcontrolasamainoperationalparameterinanaerobic/anaerobicSBRsystem.TheresultsshowedthatthefeedloadingbyinfluentCOD0~9O0mg‘Lcouldefectivelycontrolthegrowthofsludge.Thesettlingcharacteristicofinoculatedsludgewasimportantforaerobicgranulesformation,anditsSVI20~50mg·L‘。wasfavourabletogranulationdevelopmentprocess.Pureaerationwithoutsubstratefeedingcangreatlyimprovethesettleabilityofsludge,andstimulatethegranulationprocess.Theactivatedsludgewithgoodsettleabilitycouldbeconvertedtocompletelyaerobicgranularsludgethroughreducingoperationalloadinginacertaincondition.Thegranulationprocessoccu~edinCODfeeding4O0—500mg‘L~,andsludgeconcentration8~10g‘L‘。.Thedevelopedgranuleswereapproximately1.0mmindiameter,SVI25—35mg‘L~,settlingvelocity60m·h.TheauthorsproposedthatgranulationformationprocesswasattributedtoauniqueoperationalmodeinSBRsystem,i.e.thefamine。feastalternationofsubstrateinreactor.Thecontrolstrategyoforganicloadingbyreducingsubstratecouldenhancethevariationoffamine。feastinsubstrate,andm
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