A2O工艺缺氧生物磷去除

ChineseJ．Chem．Eng．，13(4)516—521(2005)AnoxicBiologicalPhosphorusUptakeinA20Process丰WANGXiaolian(王晓莲)，WANGShuying(T淑莹)andPENGYongzhen(彭永臻)”KeyLaboratoryofBeijingWaterEnvironmentRecovery，BeijingUniversityofTechnology,Beijing100022，ChinaAbstractAlab-scaleanaerobic—anoxic-oxicfA20)processusedtotreatasyntheticbrewagewastewaterwasinvestigated．Theobjectivesofthestudyweretoidentifytheexistenceofdenitrifyingphosphorusremovingbacteria(DPB)，evaluatethecontributionofDPBtobiologicalnutrientremovalandenhancethedenitrifyingphosphorusremovalinA20bioreactors．SludgeanalysisconfirmedthattheaverageanoxicPuptakeaccountedforapproximately70％thetotalamountofPuptake，andtheratioofanoxicPuptakeratetoaerobicPuptakeratewas69％．Inaddition．nitrateconcentrationintheanoxicphaseanddi&rentorganicsubstrateintroducedintotheanaerobicphasehadsignificanteffectontheanoxicPuptake．ComparedwithconventionalA'Z0processes．goodremoralefficienciesofCOD，phosphorus，ammoniaandtotalnitrogen(92．3％，95．5％，96％and79．5％，respectively)couldbeachievedintheanoxicPuptakesystem．andaerationenergyconsumptionwassaved25％．Bycontrollingthenitraterecirculationflowintheanoxiczone，anoxicPuptakecouldbeenhanced，whichsolvedthecompetitionfororganicsubstratesamongpoly-PorganismsanddenitrifiersSuccessfullyundertheCODlimitingconditions．Therefore，inwastewatertreatmentplantsthecontrolsystemshouldbeappliedaccordingtothepracticalsituationtooptimizetheoperation．KeywordsA20process，nitrogenandphosphorusremoval，denitrifyingphosphorusremovingbacteria，nitraterecirculationflow1INTRoDUCTIoNPhosphorusandnitrogenremovalfromwastewa-terisaneffectiveapproachforpreventionofeutroph—icationinclosedwatersystems，andbiologicalnutri—entremovalfBNR)processeshaveprovedtobethemosteconomicalmeanstoremovenitrogenandphos—phorus．TheBNRsystemsdevelopedincludethese—quencingbatchreactor(SBR)，theUniversityofCapeTown(UCT)system，theBaxdenphoprocessandtheanaerobic—anoxic．oxic(A20)system，etc．InanA2Osystem，whichwasdesignedtoen—hancebiologicalphosphorusremoval．theanaerobicphaseoccurredbe