Treatmentofcok省略lmhybridsystem

AV8il日bleonlin6st(2X()7)153一159JOURNALOFENVIRONMENTALSCIENCESISSN1001一0742CN11一2629ZX·ac·cn1丫eatmentofcokePlantwastewaterbySNDifxedbioiflmhybridsystemQlRong,YANGuKn,YUZhao一xiang’DePa咖entofhCemis似OTn廖nUivesr奴hSanghaiZ记及理,夕2,hCina.E一amil:瓦na一r@hoamti乙eomRceeivde23eFburayrZX()6:ervised26AirPl20()6;aceePted8MayZX()6AbstarctInthisartiele,eokePlantwastewaterwastreatedbyasimultaneousniitrfyinganddeniitrfying(SND)ifxedbioiflmhyibrdsystem.TheresultsshowedthatsuiatblePar别旧etersofhtesystemwereimP0rtantofrthePeorfrmaneeofthebio一degradationsystem.Theehemiealoxygendemand(COD)remova】eiffeieneyinihtssystemwassatisafetory,higherthan94%,andammonianiotrgenwasihgherhtan95%.TheeiffuentCODeoneentrationeouldmeethtedisehagrestandard,exeePtforveyrfewsituations.Theersultsshowedhtatasuiffcientearbonsoucrewasimportantformiaknganllnonianitorgeneoncentartionmeethtedisehagrestandadr.ThenhteTNermovaleiffeieneyinhtissystemeanbeboruhgthigherhtan94%.Dissofvedoxygen(DO)15veyrimPortanttohtepeformraneeofhteSNDbi-odegradationsysetm,andhtesuiabtleDO15about3.5一om幼二atthefoerPartoferaeto.rInaddition,thepeirbnnaneeofhtesystemwasalmostnotaffeeedtbyPHValue.hTeersultsshowthatthesystem15feasibletoetrateokePlantwastewate.reKywodrs:eokeP]antwastewater:SNDflxedbioiflm:anunoinainotrgen;COD:carbonsoucreIntmdUeitonCokePlantwastewaetr15aikndofytPiealindusitralwasetwater,which15diiffeulttobiodegrade.InPraetiealindusytr,hteeomPositionandhteamountofeokePlantwasetwaetrgeradyviaresformonefaetoyrtoanohter,dePendingonhtequalityofarweoal,theoPerationPa-rarneetrs,and50on.BeeauseofhtePerseneeoferfractoyrandbiologieallyinhibiotyrogranieeomPounds,suchasPAHsandhigharnrooinaeonetnt(StamoudisandLuhty,1980:Luhtyetal.,1983:Grady,1990:V几netal.,1991),eokePlantwastewaetr15veyrharlllfultohumanhealht.AtPersent,domesiteeokePlantwasetwaetrsaermainlyetraetdbyeonvenitoniaacitvaetdsludgesystem.hTissysetm15unsaitsacfotyrinermovinghigheoneentrationofammonianiotrgenanderafretoyreomPounds,beeausehteniitrfyingbaeteiraaerdiiffeultotIiveinasusPendedgrowthsystem.AimedathtisProblem,manyreseaerhersitredotimPorvehteeracotrsutretuer(Zhangeral.,1998:Lietal.,2001:Jiang,1993:Suottnetal·,1999),devisenewteehnologiealPoreess(Shu,1990),eulitvaeteiffeientbaeteira(Hongetal.,1999:Hyungseok,1999)and50on,tomeethtedisehargesantdards.InthePastdecades,exetnsivewokrhaddemonstratedhtatbiologiealniotrgenermvoalPoreesswasaneffeeitvemehtodforhteetratmentofeokePlantwastewaet.rhTeer-aetionofbiologiealniotrgenermovalincludedniitrifeaitonanddeniitrifeaiton,whiehweeraceomPlishedbyniitrfyinganddeniitrfyingbacteira,爬sPecitvely.Usuallyhteniitr-fyingbacteiraweerbelievedasaeorbiemieorogranisms,whilehtedeniitrfyingwasanaerobie.50,inPverioussutd-*Co能spondingauhto.rE一mial:[e-mail]自i.deu.en.ies,hteniotrgenermovalProeesswasalwaysearriedoutinmoer一than一twoseParaeteraeotrs,suehasanoxie/aeorbie(A/O)systemandanaerobica/noxic阳eorbie(A/A/O)sys-etm.Inereentyears,manystudieshaddemonstraetdhtePhenomenonofnon一assi而lation1055ofniotrgen(Hongetal.,1999).Someerseaerhersalsofoundhtat,inasPeeialenviornment,deniitrifeiatoneouldalsobeachievedinaeorbieeondition,i.e.,aeorbiedeniitrifciaton(oKngandLi,2004:ChirstineandSabine,1998;Robertsoneral.,1988).hTemainevideneewashte1055oftotalnitrogen(TN).oneofhtePorblemsinbiologiealniotrgenermovalofcokePlantwastewater15htelackofcabronersouere,whiehactsaselectrondonorindeniitrifeation.TheunvaailableogranieearbonsincokePlantwastewaetrfuhrtererdueetheraitoofogranieearbontonitrogen.Moerover,alkalinity15neededinaeorbieeractortoeomPensatehtealkalinityeonsumPitonbyniitrifeation.Simulatneousniitrfyinganddeniitrfying(SND)phenomenonweererPoertdinsomeerseacrhereently.InhtePoreess,niitrfyinganddeniitrfyingeraeotrsweerifnishedinoneeracot.robviously,diffe-rentmieroenviornmentsweerneededtoinoeulatedifferentbaeteira.TheonlywaywasbyeonotrllinghteoPerationalParameterstemPorallyorsPaitally.hTesequeneingbateheracotrwasoneexamPleforSND:inwhiehaerobieandanaerobieconditionsweerkePtaceodringtemPoralshcedules(uYetal.,1997).hTePersentsutdiesonSNDweermostlyfoeusedonsequeneingbaetheraeto.rButinhteeractors,thePartielesizeofsludgewastoosmallandeasilybePenetratedbydissolvedoxygen(DO).HighDOeouldinhibithtedeniitrfyingPoreess,whiehwouldersultinbadPeformrance·QlRongeral.Vol.19hTeobjeeitveofihtssutdywasotinvestigaethtefea-sibiliytofSNDPocressviadiffeernt而eorevniornmentssPaitally.Inodrertoinsuerhteeretntiontimeofnitrobac-teira,andehnaneehtebioiflmabiliyttoersisthteshock,Pacikngmeidaweerused.onhtebasisofhteeharacetrsofhteSNDsysetm,hteograniePollutantsandniotrgenermovalaretsweersutdied.hTemajorinfluenitalacftorsweeralsoinvesitgaetd,andhteoPitmumoPearitonaleon-diitonsweerseleeetd.NO3一NandKN(NH3一Nandogranie一N).IMaetiralsandmehtdosExPiermenstweereondueetdtostudyhtedegradationeiffeieneyofhteSNDifxed一bioiflmhybirdsysetm.hTeflowsheet15showninFig.l.hTedimensionsofthemianeraeotrwas18X()mmx50()mmx750mm,andhteeffeetivevolu们。ewas18X()rnrnXSX()rnrnX500mm.Theaearotrsweerarrangedonlyne