DO及絮凝剂对移动床膜生物反应器运行效果影响的研究何亚婷

····℃℃DOI:10.14029/j.cnki.issn1004-0935.2018.06.006FireSafetyJournalSimulationResearchonPoolFireCharacteristicsofLargeStorageTanksZHANGRi-peng1,21.SinopecQingdaoResearchInstituteofSafetyEngineering,ShandongQingdao266071,China2.StateKeyLaboratoryofSafetyandControlforChemicals,ShandongQingdao266071,ChinaAbstract:Inordertostudythefirecharacteristicsoflargestoragetanksinanall-roundway,thefirecharacteristicsof5000m3dieseltankwerestudiedbynumericalsimulation.Theresearchfocusedontheheatreleaserate,thethermalradiationintensity,thetoptemperatureofthetankandtheflametemperature.Thesimulationresultsshowedthat:theheatreleaserateofthefirequicklyreachedthestablestate,andthestabilityvaluewasabout772MW.Fortheplanewiththeheightlessthan8m,thethermalradiationintensityincreasedgraduallyandthendecreasedwiththeincreaseofdistance;Fortheplanewiththeheightgreaterthanorequalto12m,thethermalradiationintensitydecreasedwiththeincreaseofdistance;Thetanktopwalltemperaturereachedthehighestlevelafter3min,about740;Alongtheaxisoftheflamecenter,theflametemperatureincreasedgraduallyatfirst,andthengraduallydecreasedwiththeincreaseofheight.Keywords:numericalsimulation;heatreleaserate;temperature;thermalradiationintensityStudyontheEffectofDOandFlocculantonMovingBedBiofilmReactorHEYa-ting,WANGZhuoLiaoningNorthernEnvironmentalProtectionCo.,Ltd.,LiaoningShenyang113001,ChinaAbstract:Themovingbedbiofilmreactor(MBBR)isanefficienttechnologyforwastewatertreatmentandreuse.Ithasmanyadvantages,suchasgoodtreatingeffect,stableoperation,flexiblecontrolandsmallfloorspace.Soithasbeenwidelyusedinthefieldofsewagetreatmentandreuse.Inthispaper,theimpactofDOandadditionofPAFConMBBRreactorwasstudied.TheresultsshowedthattheaverageconcentrationsofCODineffluentsfromPAFC-MBBRandcommonMBBRwere9.72mg/Land15.66mg/L,respectivelywhenDOwas3.5mg/L.DOhadagreaterinfluenceontheremovalofNH4+-N.WhenDOwas3.5mg/L,theremovalrateofNH4+-Nwasthehighest,morethan85%.Underthesamedissolvedoxygen,theCODremovalefficiencyofPAFC-MBBRwashigherthanthatofordinaryMBBR,andtheadditionofPAFCreducedtheeffectoflowerdissolvedoxygenontheremovalofNH4+-N,whichwasbeneficialtotheremovalofNH4+-N.Keywords:movingbedbiofilmreactor;dissolvedoxygen;denitrification