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©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(China)October2008A/O,,,(,100022):A/O,,3:,,,A/O,,,:;;;;:X70311:A:0438-1157(2008)10-2608-08Establishmentandapplicationofinfluentflowdistributionexpertsysteminstep2feedA/OprocessWANGWei,WANGShuying,SUNYanan,PENGYongzhen(KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentalRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022,China)Abstract:Inthestep2feedanoxic/oxic(A/O)process,influentflowdistributionratioisacrucialcontrolparameter,whichpromisessteadyoperationofthesystemanddominatesthisprocess1Threedifferentinfluentflowdistributionmethodsproposedinthispaperinclude:(i)sameF/Mratiotonitrifiers;(ii)optimalcoefficientand(iii)voluminousinfluentattheendofsystem1Basedonthedistributionmethodspresentedabove,atechnicallyfeasibleandeconomicallyfavorableexpertcontrolsystemofflowdistributionwasestablishedonthebasisofthedataobtainedfromapilot2scaledomesticwastewatertreatmentsystem1Therelatedinformationfromliteratureandtheknowledgeofhumanexpertsacquiredthroughyearsofexperiencewerealsoincorporated1Thesuggestedinfluentflowdistributionmethoddefinedbyexpertsystemisdirectlydecidedbyinfluentloadingandrawwastewatercharacteristics,aswellaseffluentquality1Finally,theapplicationofthisexpertsystemwasillustratedbyusingonedaysdatafromarealplant,whichrepresentsthetypicalchangesofinfluentflowsandwastewatercharacteristics.Keywords:wastewater;biologicalnitrogenremoval;step2feed;influentflowdistribution;expertsystem2008-02-25,2008-07-03::(1979),,:(2006AA06Z319);2;(20060005002)Receiveddate:2008-02-25.Correspondingauthor:Prof.PENGYongzhen.E-mail:pyz@bjut1edu1cnFoundationitem:supportedbytheHigh2techResearchandDevelopmentProgramofChina(2006AA06Z319),ScientificResearchBaseandScientificInnovationPlatformofBeijingMunicipalEducationCommission,andtheDoctoralProgramFoundationofInstitutionsofHigherEducationofChina(20060005002).©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(A/O),,,;,,[125],,,,,,,,[628]A/O,,A/O,,,,,,1A/O111A/OA/O1,1,1r1Q,1,r1QNO-x2N,2,2r2Q,,rnQNOx2NCOD1123:,,,111211A/O,,(MLSS),F/M(/)F/MF/M,,F/M,,rnr1=r+r1r+r1++ri++rn(i=2,3,,n)(1)rii(i=2,3,,n),r,r1++ri++rn=1r,,F/M,,1A/OFig11Configurationandmassbalancediagramofstep2feedA/OprocessQtotalinfluentflowrate;rifractionofinfluentflowfedtostepi;rreturnedactivatedsludgerecycleratio;S0influentCODconcentration,mgL-1;A0influentTKNconcentration,mgL-1;Neeffluentnitrateconcentration,mgL-1906210:A/O©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(SiNi)S0A0Si=rir1+r2++ri+rS0(2)Ni=ri-1r1+r2++ri+rA0(3)i(4)ri=A0S0ri-1(i=2,3,,n)(4),,NO-32N,BOD5COD,CODCr[mgCODCr(mgNO-32N)-1],(SRT)(4),,,,,A0S0,riri-1,riri-1=A0S0=opt,optCODCr/TKN,opt1,;CODCr/TKN,opt1,11213,,,,,,,,,,,,,,,,,,22112320L,4,1323,90L5,,4212CODCr235280mgL-1,NH+42N4455mgL-1,BOD5110150mgL-1,NO-32N01051142mgL-1,NO-22N01080119mgL-1,,213CODCrNH+42NNO-22NNO-32NMLSS2Fig12Schematicdiagramofpolit2scalestep2feednitrogenremovalprocessD1D4anoxiczoneofthefirsttothefourthstage;Nijthejaerobiczoneoftheistage016259©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[9],TNmultiN/C3000,NH+42NNO-x2NWTWTresConNH+42NNO-x2N;DOWTW340i3A/O311,,A/O,,,,[7,10],,,,,,,,,,312A/OA/O:(1);(2);(3)1mgL-1,,5mgL-1,,,,A/O,3,1mgL-1,,1mgL-1,,,C/N,,C/N,,,;C/N,,,,TN,,,1mgL-1,,,,DO,,F/M,,,1mgL-1,5mgL-15mgL-1,,,C/N,,,,,,C/N,F/M,,,,,5mgL-1,,,,SS,SS,,SS,,(),SS,,,,;,MLSS116210:A/O©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(4),,21:3003:30,5(a)1512mgL-1,7118mgL-1,TN26137mgL-1,TN56115%,5(b),21:30,617mgL-1,5mgL-1,,C/N,,619mgL-1,1512mgL-1;4151mgL-1,TN24126mgL-1,TN59114%,,A/O,TN,,,,7104(6):(1)COD280mgL-1,40mgL-1,C/N=7;(2)COD360mgL-1,90mgL-1,C/N=4;(3)COD360mgL-1,40mgL-1,C/N=9;(4)COD540mgL-1,60mgL-1,C/N=9:,C/N,,C/NC/N=7,opt=110,0125012501250125;316210:A/O©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=4,opt=1175,01096011701290151;C/N=9,opt=0178,01350127012101167(a)4173mgL-1,14156mgL-1,TN22167mgL-1,TN58167%7(a),14156mgL-1,:,7(b),22h,5mgL-1,C/N,7(b),,,(19:30)(22:00)2h,6178mgL-114156mgL-1,,2107mgL-1,TN16148mgL-1,TN68149%,,TN9182%6Fig16Characteristicsofinfluentflowwastewater5(1)3A/O,,C/N,,,7,Fig17Comparisonofeffluentqualityofsystemwithandwithoutexpertcontrolsystem,(2),,,,A/OReferences[1]GÊgnE,ArtanN,OrhonD,etal1Evaluationofnitrogenremovalbystepfeedinginlargetreatmentplants1Wat1Sci1Tech1,1996,34(1/2):2532260[2]LarreaL,LarreaA,AyesaE,etal1Developmentandverificationofdesignandoperationcriteriaforthestepfeedprocesswithnitrogenremoval1Wat1Sci1Tech1,2001,43(1):2612268[3]deBallilloC,CarrioL,MahoneyK,etal1Practicalconsiderationsfordesignofastep2feedbiologi