好氧颗粒污泥溶解氧传递孙贺江

　60　6　　　　　　　　　　　　Vol.60　No.6　20096　　CIESC　Journal　　　June　2009孙贺江1,张云霞1,2,季　民1,王秀朵2,李　超1,郭淑琴2,何　乐1(1,300072;2,300051):,,。,DO,0.45×10-9m2·s-1;,0.10gO2·(gMLSS)-1·h-1,0.65mg·L-1。,DO,DO,,,(1.5mm),DO4.0mg·L-1,,r/R0.49～0.65,DO0;(0.5mm),,,1,;,DO,,、。:;;;:X703.1　　　　　　:A:0438-1157(2009)06-1540-06OxygentransferinaerobicgranularsludgeSUNHejiang1,ZHANGYunxia1,2,JIMin1,WANGXiuduo2,LIChao1,GUOShuqin2,HELe1(1SchoolofEnvironmentalScienceandEngineering,TianjinUniversity,Tianjin300072,China;2TianjinMunicipalEngineeringDesignInstitute,Tianjin300051,China)Abstract:Oxygentransferislimitedinaerobicgranulesbycompactmicrobialspatialstructure.Aerobicgranulesweresupposedtobespherical,andkineticparameterswerecalculatedthroughtests.Asimplifiedequationofmassbalanceforsteady-statediffusionofoxygenwassetupandverified.Effectivediffusivitywas0.45×10-9m2·s-1,throughdissolvedoxygen(DO)changeofdeactivatedgranularsludge.Oxygenspecificconsumptionrateandoxygenhalfsaturationcoefficientwere0.10gO2·(gMLSS)-1·h-1and0.65mg·L-1throughbeakertestundertheconditionofCOD400mg·L-1andNH4-N100mg·L-1.Thehighertheoxygenconcentrationandconcentrationgradient,thestrongerandthefurtheroxygencouldpenetrate.Whentheradiusofgranularsludgewasmorethan1.5mm,oxygencouldnotpenetrate,despiteoxygenconcentrationwas4.0mg·L-1.Whenr/Rwasbetween0.49and0.65,theconcentrationgradientbecamezero.Whentheradiuswasverysmall(lessthan0.5mm),oxygencouldfullypenetrateintogranules.Atthesametime,Thielemoduluswasverysmallandeffectivenessfactorwasnearto1,oxygendiffusionlimitationcouldbeneglected.Effectivenessfactorwaslargerwiththeincreaseofoxygenconcentration,whichmadeoxygenlimitationless.Keywords:aerobicgranularsludge;oxygentransfer;Thielemodulus;effectivenessfactor　　2008-10-23,2009-02-26。:(1976—),,,。　　　Receiveddate:2008-10-23.Correspondingauthor:SUNHejiang,associateprofessor.E-mail:[e-mail]　　,、,,[1-6],。Martijn[7],。Paul[8]Su[9],,;Su[9],。,DO,DO,。,,。1　1.1　SBR,,0.20m3,0.35m,2.0m。SBRPLC,30min、180min、30～10min、10min,250～230min,50%。,,2,SBR,1.5mm,,SVI50～70ml·g-1,2000mg·L-1。1.2　1.2.1　氧扩散系数　DeDO,BOD、。25℃。。,,,。Paul[8]5:40mmol·L-1CuSO4·5H2O24h;40mmol·L-1HgCl224h;50g·L-14h;24h;80℃15min。,。,,BOD,2h,。1000～1300r·min-1。DO。1.2.2　氧比消耗速率和氧半饱和常数　,,,:COD400mg·L-1,100mg·L-1。DO,COD、、,。1.2.3　氧传质动力学实验　,COD400mg·L-1,pH7.5,25℃。DO,DO,,105。,。2　2.1　Crank's[9-10](1),。Cb=αCb01+α1+∑∞n=161+αexp-Deq2nt/R29+9α+q2nα2(1)　CbDO,mg·L-1;Cb0DO,mg·L-1;DeDO,m2·min-1;t,min;R,mm;α();qn(2)。tanqn=3qn3+αq2n(2)Pu[11],n≥2。(1),lnCb1+αCb0α-1=ln61+α9+9α+q21α2-Deq21R2t(3)　q1(2)。α=2.33,(2),q1=3.465。(3),,·1541·　6　　:De=23.334×10-9m2·min-1=0.3889×10-9m2·s-1,1.50mm25℃De=2.50×10-9m2·s-1,Ananta[10]6mm,α=2.76,q1=3.424,2.50×10-11～1.0×10-9m2·s-1,。2.2　,DODO1。1　DODOFig.1　ChangeofDOconcentrationunderdifferentinitialDO　1,DO,,,DO0.2～0.3mg·L-1,DO0.3mg·L-1,[gO2·(gMLSS)-1·h-1],0,0.10gO2·(gMLSS)-1·h-1[2.64gO2·(gMLSS)-1·d-1]。DO1.0～4.0mg·L-1,。Su[9],dDO/dtt,0.027gO2·(gMLSS)-1·h-1[0.65gO2·(gMLSS)-1·d-1]。Ananta[10]0.019～0.027gO2·(gMLSS)-1·h-1[0.45～0.66gO2·(gMLSS)-1·d-1],Su。Gapes[12],0.52gO2·(gMLSS)-1·h-1[12.48gO2·(gMLSS)-1·d-1],0.43gO2·(gMLSS)-1·h-1[10.32gO2·(gMLSS)-1·d-1]。,,,DO2mg·L-1,,,,,。2.3　,,0,,DO。Monod(4),。rN=rN,maxDODO+KO,A(4)　rN,μg·(gMLSS)-1·h-1;rN,max,μg·(gMLSS)-1·h-1;KO,A,mg·L-1。2(0.9204),KO,A0.65mg·L-1。[13],2～3mmKO,A1.08mg·L-1,1.6μg·(gMLSS)-1·h-1。Munch[14],KO,A0.3～2.0mg·L-1,。KO,A,。2　DOFig.2　NitrificationrateatdifferentDOconcentration[rN,max=1.577μg·(gMLSS)-1·h-1,KO,A=0.65mg·L-1]　2.4　:(1);(2)·1542·　　　　　60　;(3);(4),、;(5),;(6)Monod;(7)(DO)。DO,,DO。,4πr2DedCGdRr+dr-4πr2DedCGdrr=v4πr2dr(5)　r,mm;CGDO,mg·L-1;v,mg·L-1·min-1;De,mm2·s-1。Monod()(5)Ded2CGdr2+2rdCGdr=kCGXKO,A+CG(6)　X,mg·L-1;k,gO2·(gMLSS)-1·d-1;KO,A,mg·L-1。:(1)CGm,Re,:r=Re,CG=CGm;(2)DO(r=Ri),DO,:r=Ri,dCGdr=0,CG=0。2.5　DOMatlab,Runge-Kutta(6),DODO。3,DO0.5mg·L-1,0.5mmDO,r=0DO0.007mg·L-1;0.7mm1.5mm,DO,0.596mm0.521mm,39.7%34%,DO0。DO2.0mg·L-1,0.7mm,r=0DO0.07mg·L-1;1.5mm,DO,0.778mm,52%。3　DOFig.3　ChangeofDOinrelationtodimensionlessradiuswithdifferentradius　4,,DO。(0.5mm),DO(0.5mg·L-14.0mg·L-1),DO(4.85mg·L-1·mm-117.18mg·L-1·mm-1)。1.5mm,DO,,。DO0.5mg·L-1,DO5.56mg·L-1·mm-1,r/R0.65,DO0;DO2.0mg·L-1,DO15.62mg·L-1·mm-1,r/R0.56,DO0;DO4.0mg·L-1,DO23.95mg·L-1·mm-1,r/R0.49,DO0。,(1.5mm),DO4.0mg·L-1,,r/R0.49～0.65,DO0,DO0。2.6　Δt,DODO。DO,·1543·　6　　:。DO。,5,。2.7　η(),Gonzalez[15],Su[9]。,;η。,DO,η[9]=Re3kXDeKO,A(7)η=3ReDeKO,A+CGkXCGdCGdrr=Re(8)　dCGdrDO,mg·L-1·mm-1。6,≤1,η1,,Su[9]Chen[16]。η,,,η,,;,η1,,,。,,DO,η,DO,,。6　DOηFig.6　Effectivefactor(η)asafunctionofThielemodulus()atdifferentDOongranulesurface　3　　(1),0.45×10-9m2·s-1;,(COD400mg·L-1,100mg·L-1),0.10gO2·(gMLSS)-1·h-1[2.64gO2·(gMLSS)-1·d-1],KO,A0.65mg·L-1。(2),DO,。,DO,DO,,,·1544·　　　　　60　(1.5mm),DO4.0mg·L-1,,r/R0.49～0.65,DO0。(3),η1,,。,DO,η,DO,,。References[1]　HuangYufeng(),ZhangLili(),HaoWei(),CaiWeimin().CultivationandremovalefficiencyofaerobicgranularsludgeinSBR.ChinaWater&Wastewater(),2005,21(2):53-55[2]　ShiXiaohui(),LiuFang(),LiuHong(),ZhuJianrong().Investigationofaerobicgranularsludgecultivationbyfeedloadingasacontrolstrategy.EnvironmentalScience(),2007,28(5):1026-1032[3]　ChiuZC,ChenM