不同回流率下的循环流化床脱氮性能研究崔玉波

＊崔玉波(,116600)　刘洪波(,300072)白春学(,116600)　一种新型的生物脱氮工艺———生物循环流化床(CFBBR)用于脱氮和除碳。系统由缺氧床(升流床)和好氧床(降流床)及其连接装置构成。进水由缺氧床底部进入,同来自好氧床的硝化液一起,在缺氧床内完成脱氮和除碳。研究了不同进水负荷,硝化液回流率200%～600%下的系统性能。从技术和经济角度考虑,400%硝化液回流率为最佳。最短水力停留时间2.5h(缺氧床0.8h,好氧床1.7h)和400%硝化液回流率下,TN和CODCr去除率和出水浓度分别为88%、95%和3.5mgL、16mgL。系统VSS低于1gL,硝化率和反硝化率分别为0.026～0.1g(g·d)和0.016～0.074g(g·d)。　生物循环流化床　硝化　反硝化　回流率　　　　　　　　＊(205189)0　,2070[1]。A2O、UCT、Phoredox。。Henze-,[2]。,。,,,、、[3],。、。1　1.1　试验装置1。,[4]。,,。,,2:,。:3.8cm,1.03m,1　1.2L;1.905cm,1.52m,0.43L。5.08cm,1.62m,3.3L。、21。2,。3,19%,0.16m。1,25%,60。、。,,,。,7　　　200712256DOI:10.13205/j.hjgc.2007.06.027。,,。2,。1.2　试验材料。、、。:1000kgm3,1720kgm3,2560kgm3,61%,0.3～1.0mm,0.67mm,2.53kg。NaCH3COO、NH4Cl、KH2PO4。NiCl·6H2O0.3mgL;CoCl2·6H2O0.3mgL;CuCl·2H2O0.8mgL;ZnCl20.5mgL;MnCl2·4H2O5mgL;FeCl3·6H2O3mgL;(NH4)6Mo7O24·4H2O0.8mgL;H3BO30.5mgL;MgSO4·7H2O140mgL;CaCl2·H2O60mgL。1.3　试验方案及运行参数,1,25～28℃。1　(L·h-1)%CODCr(mg·L-1)NH+4-N(mg·L-1)PO3-4-P(mg·L-1)HRTh0.520024727.45.023.266.69.91200256255.3430029627.45.41.633.34.940029825.85.281.520029226.2274.831.5400280275.121.092.23.360027227.85.5220033028.95.4140032737.35.480.821.652.56003827.85.351.4　试验启动1L。MLSS3420mgL,MLVSS2704mgL。。24h,0.5L,,0.5Lh。(HLR)2.44m3(m3·d),2,25～28℃[5]。15,CODCr,20,,82mgL,25mgL。20d,,。VSS,、12.3mgg9.71mgg,4521mgL4207mgL。24,NH+4-N7～15mgL,NH+4-N2mgL,NO-3-N0.9mgL,NO-2-N0.24mgL;、。NH+4-N,NH+4-N,,NH+4-N。24,36,。28,NH+4-N8mgL15mgL。NO-3-N,NO-2-N,、。、,42,NH+4-N,15mgL27mgL,NO-3-NNH+4-N,NH+4-NNO-3-N,TN64%。1,,。2　2.1　氮去除率与硝化液回流率之间的关系2TN。。-,NH+4-NNO-3-NNO-2-N,NO-3-NNO-2-N。、,(η)(r):η=r(r+1)。2,,400%。,NH+4-N0～0.7mgL,97%,NH+4-N。3NO-x-N(NO-3-NNO-2-N)8　　　2007122562　TN。,NO-2-N0.017～0.038mgL。NO-x-NNO-3-N。3　NO-x-N2.2　硝化率、反硝化率及系统的VSS,::[QinR(CA-NO-x-N-CO-NO-x-N)-　　QinCA-NO-x-N]VSSA:[Qin(1+R)(CO-NH+4-N-CA-NH+4-N)]VSSO　Qin———,Lh;R———,%;CA-NO-x-N———NO-x-N,mgL;CO-NO-x-N———NO-x-N,mgL;VSSO———VSS,mgL;CO-NH+4-N———NH+4-N,mgL;CA-NH+4-N———NH+4-N,mgL;VSSA———VSS,mgL。。45、、VSS。,VSS,。VSS,。,0.026～0.1g(g·d),0.016～0.074g(g·d)。4　VSS5　VSS2.3　有机物的去除6CODCr。,CODCr250～340mgL,,95%,。6　CODCr3　,。,,TN,400%TN。,,DO,。,DO0.3mgL(,),ORP,,200%～600%。2,400%600%TN,9　　　200712256400%,,TN。,,400%。3,,NO-3-N,。200%～400%,NO-3-N,400%～600%,NO-3-N,(5mgL)。400%。。0.5～1m,。,,0.009～0.31g(g·d)。25℃,0.2～0.4g(g·d)[6]。。,0.09～0.19g(g·d)[7-8],。,0.026～0.1g(g·d)0.016～0.074g(g·d),,。40gL。,。,VSS0.43～0.9gL,。HRT2.5hCN,HRT14。,。McCarty,,NO-3-N3.7mgmg[9]。Shimizu,,5.6mgmg[10-11]。,,。Verstraete,,NO-3-NCODCr∶ρ(NO-3-N)=10[12]。,CODCrρ(TN)5～10。,25～30mgLTNCODCr125～300mgL。6,CODCr250～340mgL,95%。CODCrρ(TN)9～12,,。,CN。4　(1),,。(2),,,400%。CODCr。(3)2.5h,,。(4),,。[1]　ShimizuT,TamboN,KudoK,etc.Ananaerobicfluidizedpelletbedbioreactorprocessforsimultaneousremovaloforganic,nitrogenousandphosphorussubstances.Wat.Res.,1994,28(9):1943-1952.[2]　HenzeM,HarremoesP.Chemical-biologicalnutrientremoval-theHYPROconceptHahnHHandKluteR.ChemicalWaterandWasterwaterTreatment.Berlin:Springer,1990:499-510.[3]　,NakhlaG,ZhuJ..,2005,21(1):93-95.[4]　ZhuJ,ZhengY,DimitreGK,etc.Bassi.(gas-)liquid-solidcirculatingfluidizedbedsandtheirpotentialapplicationstobioreactorengineering.Can.J.Chem.Eng.,2000,78:82-94.[5]　,NakhlaG,ZhuJ.-.,2005,10:37-40.[6]　NuttSG,MelcerH,PriesJH.Two-stagebiologicalfluidizedbedtreatmentofcokeplantwastewaterfornitrogencontrol.JournalWPCF,1984,56(7):851-857.[7]　CooperPF,WilliamsSC.High-ratenitrificationinabiologicalfluidizedbed.WaterSci.Tech.,1990,22(12):431-442.[8]　GreenMK,HardyPJ.Thedevelopmentofahigh-ratenitrificationfluidizedbedprocess.Wat.Pollut.Control,1985,84(1):44-50.[9]　McCartyL,BeckL,AmantPS.BiologicaldenitrificationofwastewaterbyadditionoforganicmaterialsPurdueUniversity.Proceedingofthe24thIndustrialWasteConference.1969:1271.[10]　ShimizuT,FurukiT,WakaiT,etc.MetaboliccharacteristicsofdenitrificationbyParacoccusdenitrificans.JFerm.Technol.,1972,56:20-213.[11]　ShimizuT,SakamotoY,WakaiT,etc.KineticstudyofdenitrificationbyParacoccusdenitrificans.JFerm.Technol.,1972,56:20-213.[12]　VerstraeteW,vanVaerenberghE.AerobicactivatedsludgeSchonborn,W..Biotechnology.Germany:VCH,Weinheim,1986:43-112.　　116600　　E-mail　[e-mail]2007-05-1410　　　200712256NOVELCIRCULATINGFLUIDIZEDBEDBIOREACTORFORNITROGENREMOVALUNDERDIFFERENTNITRIFIEDLIQUIDRECIRCULATIONRATESCuiYubo　LiuHongbo　BaiChunxue(7)…………………………………………………………………………………………………………………………………………Abstract　Anewbiologicalnitrogenremovalprocess———Thecirculatingfluidizedbedbioreactor(CFBBR)isdevelopedforsimultaneousremovalofnitrogenandorganicmatter.Thissystemiscomposedofanaerobicbed,aerobicbedandconnectingdevice.Influentandnitrifiedliquidfromaerobicbedenteranaerobicbedfromthebottomoftheanaerobicbed,completingtheremovalofnitrogenandorganicmatter.Thesystemperformanceundertheconditionsofdifferentinflowloadingsandnitrifiedliquidrecirculationratesrangingfrom200%to600%wasexamined.Fromtechnicalandeconomicpointofview,theoptimumnitrifiedliquidrecyclerateis400%.Withashortesttotalretentiontimeof2.5h(0.8hintheanaerobicbedand1.7hintheaerobicbed)andanitrifiedliquidrecirculationrateof400%basedontheinfluentflowrate,theaverageremovalefficienciesandeffluentconcentrationsoftotalnitrogenandsolu