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1、CONDITIONSANDMECHANISMSAFFECTINGSIMULTANEOUSNITRIFICATIONANDDENITRIFICATIONINAPASVEEROXIDATIONDITCHAbstractSimultaneousnitrificationanddenitrificationinaPasveeroxidationditchwasstudied.Thepurposewastoevaluatetheperformancesofbothnitrificationanddenitrificaioninoxidationditches,andt
2、opursuesomepossibleapproachestoenhancenitrogenremoval.Almostcompletenitrificationwasobservedundernormalconditions,butwhenDO＜1.0mg/land/orT＜4℃,nitrificationwasprofoundlyaffected.Alsobecauseoflowtemperature,transientnitriteaccumulationappearedontwooccasions.Itwasconcludedthatfornitri
3、ficationtherewasastrongcapacitytoabsorbshocknitrogenloading.However,denitrificationwasunstableandpoor;Theaverageefficiencyofnitrogenremovelwasonly45%duringastudyperiodofalmost10months.Thebottlenecktodenitrificationwasattributedtothelackofstableanoxiczonesandcarboncompoundsavailable
4、todenitrifiers.Severaltechnicalapproachesarestronglyproposedtoimprovedenitrification.Keywords:Nitrification,denitrification,Pasveeroxidationditch,anoxiczones,flocs,mixedliquor,dilutionfactor,fibrouscarriers,contacts,contacttank.NOMENCLATUREDO:Dissolveoxygen（mg/l）,T:Temperrature（℃）,
5、p.e.:Populationequivalent,SS:Suspendedsolid（mg/l）,MLSS:Mixedliquorsuspendedsolid（mg/l）,MLVSS:Mixedliquorvolatilesuspendedsolids（mg/l）,COD:Chemicaloxygendemand（mg/l）,BOD5:5-daybiochemicaloxygendemand,HRT:Hydraulicretentiontime（h）,SRT:Solidsretentiontime（days）,Kj-N:TotalKjeldahlnitro
6、gen（mgN/l）,TN:Totalnitrogen（mg/l）,SVI:Sludgevolumeindex（ml/g）,SV%:Specificvolumeofsludgesettlementfor30min（%）INTRODUTIONTheoxidationditchprocessisaneconomicandefficienttechniqueofbiologicalwastewater-treatment.Incontrollingeutrophication,oxidationditcharecompetitivewithotheractivat
7、ed-sludgeprocesses.ThoughthePasveeroxidizethefirstdesignspeculationoftheditchandcancarryonatthesametimeindidingnothopetomakenitricturnrespondtoturntorespondwithanti-nitric,oxidizethespecialstructureofditchandhandlethecharacteristicsoftheprocesstohasalreadyletthisbecomerealistic.Inf
8、act,itismanytooxidizethedi
