A2O工艺中反硝化除磷及过量曝气对生物除磷的影响

568Vol.56No.820058JournalofChemicalIndustryandEngineering(China)August2005==================A2O1,1,2,1(1,100022;2,150090):,,“”,.,--(A2O).,A2O,PHB,,71.3%,25%.COD200mg·L-1400mg·L-1,COD、,10mg·L-10.30mg·L-1.,,,,,.:A2O;;;:X703.1:A:0438-1157(2005)08-1565-06AnoxicbioIogicaIphosphorusremovaIandeffectofexcessiveaerationonbioIogicaIphosphorusremovaIinA2OprocessWANGXiaoIian1,WANGShuying1,MAYong2,PENGYongzhen1(1SchoolofEnvironmentalandEnergyEngineering,BeijingUniversityofTechnology,Beijing100022,China;2SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,Heilongjiang,China)Abstract:Apilot-scalenutrientremovalactivatedsludgesystem,basedontheA2Oconfiguration,wasusedtotreatbrewerywastewater.Intheexperiment,theexistenceofdenitrifyingphosphorusremovingbacteria(DPB)andthecontributionofDPBtophosphorusremovalwasobserved.ThetestsshowedtheaveragetotalamountofanoxicPuptakeaccountedfor70%ofthetotalamountofPuptakeofthesystematsteadystate,oxygenrequirementcouldbedecreasedsignificantly(about25%).DenitrifyingphosphateremovalresolvedthecompetitionfororganicsubstratesbetweenPoly-Porganismsanddenitrifiersunderlowerorganicloading.Effluenttotal-Pconcentrationcouldachievelessthan0.30mg·L-1andaverageeffluenttotal-Nwaslessthan10mg·L-1.Itisclearlydemonstratedthatthephosphorusuptakealmoststoppedinanover-aeratedsystem,thereleasedphosphoruscouldnotbetakenupfullyagain.Consequently,incompletephosphorusuptakeledtotemporaryreductionofbiologicalphosphorousremovalefficiency.Ittookaboutthetimeofonesludgeagetoeliminatethatdisturbance.Keywords:A2Oprocess;anoxicbiologicalphosphorusremoval;excessiveaeration;biologicalnitrogenandphosphorusremoval2004-07-05,2004-08-31.:.:(1977-),,.:(20377003),(2003AA601010)(H020620010120).Receiveddate:2004-07-05.Correspondingauthor:PENGYongzhen.Foundationitem:supportedbytheNationalNaturalScienceFoundationofChina(20377003),theNationalHighTechnologyDevelopmentProgramofChina(2003AA601010)andtheProjectofBeijingScienceandTechnologyCommittee(H020620010120).、,.,,.A2O、、,、(PAO)、、,,,,,,.A2O,(DPB)[1～3],,PHB,,,,,.,,COD50%,30%50%,,.A2O,A2O,,,“”,、,.11.1A2/O1.,8,,,、,4.51L,:::1:1.5:2.5:5.,25L.1,,,.,.、,、.21℃,:150L·d-1,HRT8.5h,SRT12d,MLSS3000mg·L-1,0.5,2.5,DO2～3mg·L-1.Fig.1SchematicdiagramofA2Oprocess1-feedtank;2-peristalicpump;3-pre-anoxic;4-anaerobic;5-anoxic;6-aerobic;7-settler;8-airpump;9-airflowmeter;10-stirrerQin-influent;QR-internationalrecirculationflow;Qr-returnsludgeflow;Qw-wastedsludgeflow1.2,COD,NaHCO3NaOHpH.:(3～3.4ml·L-1),(0.1～0.30g·L-1),KH2PO4(0.02～0.07g·L-1),NaHCO3(0.05～0.15g·L-1),MgSO4·7H2O(0.05g·L-1),CaCl2·2H2O(0.01g·L-1),1.Table1CharacteristicsofinfluentwastewaterParametersMin/MaxAverageCODCr/mg·L-1180-460342.8BOD5/mg·L-1122.4-226.8175.46NH+4-N/mg·L-136.6-55.845.44TN/mg·L-143.3-63.848.56PO3-4-P/mg·L-16.18-9.157.65alkalinity/mg·L-1350-400380,TCOD、SCOD、NH+4-N、NO-3-N、NO-2-N、TN、PO3-4-P、pH、TP、、DO、·6651·56ORP、MLSS、MLVSS,.DO、ORP、pHWTW-pH/OXi340i.,.2.Table2RuncyclesofexperimentsRuncycleScenarioⅠ/(0-40d)accumulationofPAOsⅡ/(40-80d)anoxicphosphorusuptake2/(80-106d)excessiveaeration22.1A2O,,(PAO),,.2A2O、、.,,40,22.5%60%,2,4079.5%100%,95%,5.6～8.9mg·L-1,0.30mg·L-1.,,,,1.28,WarangkanaPunrattanasin[4].Fig.2PremovalinA2Oprocess●influ.;▲anae.efflu.;*anox.efflu.;sys.efflu.3A2O.3,,Fig.3RatioofPremovaltoanoxicPremoval20%65%(40),,71.3%.,22.2mg·L-1,8.2mg·L-1.,,,DO,,,25%(DO,0.42m3·h-10.32m3·h-1),.,,,,.[5],20%～40%,,40%.4A2O.,6.7mgP·gMLSS-1·h-1,4.62mgP·(gMLSS)-1·h-1,2.08mgP·(gMLSS)-1·h-1,PHB,.,A2O,,PHB,DPB,PHB,,,,Mond,,·7651·8:A2O,PHB,,,PHB,.,(),,0,,,.Fig.4PreleaseandPuptakecharacteristicofsludge2.25A2O、,,.,36.6～55.8mg·L-1,45.44mg·L-1;TN7.6～10.8mg·L-1,9.2mg·L-1;79.9%;1～2mg·L-1,,Yuan[6],Yuan,1～3mg·L-1,COD,,COD,..2.3COD6Ⅰ～ⅡCOD,,COD,COD.,COD182～460mg·L-1,342.8mg·L-1;COD9.6～37.4mg·L-1,26.5mg·L-1;COD87.6%～97.35%,92.3%;,,CODFig.5NremovalinA2Oprocessinflu.;□efflu.;▲PremovalFig.6CODremovalinA2Oprocess□influ.;*anae.;●anox.;efflu.;▲tot.CODremoval;Δanae.CODremovalPHB,COD47.4～118mg·L-1,COD66.6%～85.8%,75.8%;COD9.5%,,COD,PHB“”,.2.4,,,COD300mg·L-17.32mg·L-1.7,80～84DO,,,0.37mg·L-15.7mg·L-1,95%25.7%.,DO2～3mg·L-1,,13,0.89mg·L-1,·8651·5687.15%,.,,31.49mg·L-1.Brdjanovic[7],,,,,,,DO,,PHB,PAO,PHB0,PAO,,,PAOPHB.,,,,PHB,,PHBNADH+,,.PHB,,,PAOPHB,,.Fig.7EffectofexcessiveaerationonPremoval□influ.;▲efflu.;DO;●anae.;ΔPremoval,,,,,,,,:,,DO2～3mg·L-1,PHB;,PHB,PHB,,.,,,DO(4～6mg·L-1),DO,.3,A2/O,.(1)A2/O、,92.3%、79.5%95.5%,26.5mg·L-1、9.2mg·L-10.32mg·L-1.,1.28.(2)A2/O,71.3%.,,“”,25%.(3),6.7mgP·(gMLSS)-1·h-1,4.62mgP·(gMLSS)-1·h-1,2.08mgP·(gMLSS)-1·h-1,PHB.(4),.References[1]GerakdMStevens,JamesLBarnard,BarryRabinowitz.Optimizingbiologicalnutrientremovalinanoxiczones.WaterScience&Technology,1999,39(6):113-118[2]BortoneG,SaltarelliR,AlonsoV,SormR,WannerJ,TilcheA.Biologicalanoxicphosphorusremoval-the·9651·8:A2ODEPHANOXprocess.WaterScience&Technology,1996,34(1):119-128[3]KubaT,VanLoosdrechtMCM,HeijnenJJ.PhosphorusandnitrogenremovalwithminimalCODrequirementbyintegrationofnitrificationinatwo-sludgesystem.WaterResearch.1996,30(7):1702-1710[4]WarangkanaPunrattanasi