分段进水AO工艺的一些关系式赵剑强

4　11环境工程学报Vol.4,No.11201011ChineseJournalofEnvironmentalEngineeringNov.2010A/O赵剑强　胡　博　陈　莹(,710064)　　A/O,。,A/O、,。,,,,,。　A/O　　　　X703.1　　　A　　　1673-9108(2010)11-2532-05Somerelationequationsforstep-feedanoxic/oxicprocessZhaoJianqiang　HuBo　ChenYing(SchoolofEnvironmentalScienceandEngineering,Chang'anUniversity,Xi'an710064,China)Abstract　Oneofthemainobjectivesofthestep-feedanoxic/oxic(A/O)processistomakefulluseoftheCODofinfluentasanorganiccarbonsourcefordenitrification,andthereforeadesignmethodthatmakestheor-ganiccarbonamountmatchthenitrateamountfordenitrificationintheanoxicreactorhasbeenacceptedfordis-tributinginfluentflowrateforeachstep.Accordingtothisdesignmethod,theparameterssuchasthetotalnitro-genremovalefficiency(TNRE)andthevolumeorhydraulicretentiontime(HRT)ofthereactorshavecertainreg-ularrelationshipswiththefactorssuchasthesludgereturnratio,theinfluentCOD/Nratio,etc.Theserelation-shipsdirectlyreflecttheeffectofthefactorsontheTNREandthedesignofthereactor.Thispaperdeducedtheserelationequations,analyzedtheeffectofthefactorsontheTNRE,andproposedseveralapproachesforim-provingtheTNRE.Therelationequationsofvolumesamongtheanoxicreactorsortheoxicreactorswereshowedwhenthereactorsweredesignedundertheconditionsofequalvolumetricload,andtherelationequationsofHRTsamongtheanoxicreactorsortheoxicreactorswereshowedwhenthereactorsweredesignedunderthecon-ditionsofequalspecificloadofnitrateorTKN.Keywords　step-feedanoxic/oxicprocess;coefficientofinfluentflowratedistribution;totalnitrogenre-movalefficiency;relationequation:2009-11-02;:2010-03-04:(1963～),,,,。E-mail:[e-mail]　　A/O(A/O)[1]。、、、,[2～5]。,A/O,。[1]。[6,7]。,A/O、,A/O,A/O、。,11:A/O、。1　1.1　nA/Or1,r2,r3,r4…ri…rn,CODm,1gCODα,,0,ii,i+1,,[7]:r1+r2+r3+r4+......+rn=1;(1)r1r2=r2r3=r3r4=......=rn-1rn=mα(2)r1ri=(mα)i-1(3),nA/Oi:ri=(m/α)n-i∑nn=1(m/α)n-1=(m/α)n-i1+m/α+(m/α)2+......+(m/α)n-1(i=1,2,3......n)(4),rmα。,n=4,(4)1。1.2　,,,,,,A/O():η=1-rn1+R(5):η;R。rn1　4Fig.1　RelationsbetweenthecoefficientsofinfluentflowratedistributionandCOD/N-ratioofinfluentin4step-feed(4)(5),:η=1-11+R×11+m/α+(m/α)2+……+(m/α)n-1(6),,:RQrnQρCOD/m(1+R)Qr1QρCOD=1α;:rnRr1(1+R)=mα(7):Q;ρCODCOD。r1rn(3)(7):　R1+R=(mα)n:R=(m/α)n1-(m/α)n(8)RRm。(8),m≥α,,,。mα,,,RRm,COD;Rm,,(R1+Rrnm-r1α)QρCOD,,。,:(1)m≥α,(6),R;(2)mα,RRm,25334(6),R;R≥Rm,(8)(6):η=1+(m/α)n-11+m/α+(m/α)2+......+(m/α)n-1=mα(9),mα,R≥Rm,R,,。,4,α=7mgCOD/mgNO-3-N[7],(6)(9)2。2　4Fig.2　Relationsamongtotalnitrogenremovalefficiency,returnsludgeratioandCOD/N-ratioofinfluentin4step-feed1.3　,、α,,,((8)2)。α[8]。60%[9,10],40%,α4.2(3gCOD/gN)[11]。3α(4.2)4。32,α,。2　2.1　(r1+R)Q,(r1+r2+R)Q,(r1+r2+r3+R)Q,……,(r1+r2+r33　α=4.24Fig.3　Relationsamongtotalnitrogenremovalefficiency,returnsludgeratioandCOD/N-ratioofinfluentin4step-feedforα=4.2+......+rn+R)Q。,ρN,1～nrnQρNR/(1+R),r1QρN,r2QρN,……,rn-1QρN,,PNO,(Va):Vai=rnQρNR/[(1+R)PNO]　(i=1)ri-1QρN/PNO　　　　(i≠1)(10),r(2)(3),:Va2Va3=Va3Va4=......=Van-1Van=mα(11)Va1Vai=(αm)n+1-iR1+R　(i≠1)(12)2.2　。,,,(COD)。,。r1QρN,r2QρN,r3QρN,……,rnQρN。,PN,(VO):VOi=riQρN/PN(13)253411:A/O,,。r(2)(3),:VO1VO2=VO2VO3=VO3VO4=......=VOn-1VOn=mα(14)VO1VOi=(mα)i-1(15),1(n=4)。:VOi=(m/α)n-i1+m/α+(m/α)2+......+(m/α)n-1×QρNPN(16)2.3　2.3.1　污泥浓度的沿程变化0,,ρR,(ρSi):ρSi=RρRr1+r2+......+ri+R(17),,AO。2.3.2　污泥负荷的沿程变化、,(PSNOi)(PSNi):i:PSNOi=r1+r2+......+ri+RRρRPNO(18)i:PSNi=r1+r2+......+ri+RRρRPN(19),AO。3　3.1　2.1,,(PSNO),(17),:Vai=rnQρN(r1+R)/[PSNOρR(1+R)]　(i=1)ri-1QρN(r1+r2+……+ri+R)/(PSNORρR)　　　　　　　(i≠1)(20)(HRT):tai=rnρN/[PSNOρR(1+R)]　(i=1)ri-1ρN/(PSNORρR)　　(i≠1)(21)r(2)(3),HRT:ta2ta3=ta3ta4=......=tan-1tan=mα(22)ta1tai=(αm)n+1-iR1+R(23)3.2　2.2,,(PSN),(17),:VOi=riQρN(r1+r2+......+ri+R)/(PSNRρR)(24):tOi=riρNPSNRρR(25),,HRT。r(2)(3),HRT:tO1tO2=tO2tO3=tO3tO4=......tOn-1tOn=mα(26)tO1tOi=(mα)i-1(27)HRT1(n=4)。4　　,A/O,,mα,mα,。25354、,。、。,,。[1]GögǜnE.,ArtanN.,OrhonD.,etal.Evaluationofni-trogenremovalbystepfeedinginlargetreatmentplants.WaterScienceandTechnology,1996,34(1～2):253-260[2]JohnsonB.R.,GoodwinS.,DaiggerG.T.,etal.Acomparisonbetweenthetheoryandrealityoffull-scalestep-feednutrientremovalsystems.WaterScienceandTechnol-ogy,2005,52(10-11):587-596[3],..,2003,19(4):32-36[4],,,.A/O.,2006,19(3):66-71[5],,,..,2008,29(8):2227-2234[6],,,..,2006,22(21):1-5[7],,,.A/O.,2009,3(1):90-92[8],,,..,2006,26(3):293-297[9],,..,2001,28(4):88-91[10]TurkO.,MavinicD.S.Maintainingnitritebuild-upinasystemacclimatedtofreeammonia.WaterResearch,1989,23(11):1383-1388[11]VanBenthumW.A.J.,DerissenB.P.,VanLoos-drechtM.C.M.,etal.Nitrogenremovalusingnitrifyingbiofilmgrowthanddenitrifyingsuspendedgrowthinabio-filmairliftsuspensionreactorcoupledwithachemostat.WaterResearch,1998,32(7):2009-20182536