搜索
3210201110ENVIRONMENTALSCIENCEVol．32No．10Oct．2011-200237-．DO3.5～4.3mg/L、DO0.9～1.1mg/L2、HRT、C/N．3C/NC/N=3∶11∶1HRT+10+5h、8+4h、6+3h、4+2hC/N=3∶1HRT+=10+5h1∶2、1∶1、2∶12HRT+=10+5h1∶1C/N2∶1、3∶1、5∶1、10∶1．C/N5∶11∶1HRT10h5hCOD、254、37.248.2mg/LCOD、48、9.314.8mg/L．、、．-X703.1A0250-3301201110-2986-072010-11-182011-03-05510081241975～E-mailxrchen@ecust．edu．cnEffectiveNitrogenRemovalinLowC/NWastewaterwithCombinedAerobic-LowDOBiofilmTreatmentProcessCHENXiu-rongAIQi-fengXUWen-luWUMin-linSchoolofResourceandEnvironmentalEngineeringEastChinaUniversityofScienceandTechnologyShanghai200237ChinaAbstractThemunicipalwastewaterinChinaischaracterizedbylowratioofcarbontonitrogenwhichisthekeyrestrictivefactorforeffectivebiologicalremovalofnitrogen．Inthisstudytheaerobic-lowDObiofilmprocesswasusedforthenitrogenremovalofmunicipalwastewater．Bymeansofadjustinginflowratiosofaerobicsectiontolow-DOsectionhydraulicretentiontimeHRTandinflowratioofcarbontonitrogenC/Ntheperformancesofnitrificationinaerobicbiofilmsectionanddenitrificationinlow-DOsectioncouldbeimprovedthegoodperformanceofnitrogenremovalwasachieved．Inordertoinsurethegoodeffluentqualityespeciallyforammonianitrogenandtotalnitrogenindexesthenitrificationanddenitrificationcouldbemadeupinaerobicandlow-DObiofilmsectionrespectivelyduetothecoexistenceofaerobicandanoxiczoneinbiofilm．Therewere3stagesfortheresearchprocess．InthefirststagetheoriginalC/Ninflowratiosofaerobicsectiontolow-DOsectionwerechosenas3∶1and1∶1respectivelythentheeffectsofvariousHRTaerobicsection+lowDOsectionvaluessuchas10+5h8+4h6+3h4+2htonitrogenremovalwereanalyzed．AccordingtotheconclusioninthefirststagetheoriginalC/Nwaskeptat3∶1HRTaerobicsection+lowDOsectionwas10+5h．Thentheeffectsofvariousinflowratiostonitrogenremovalwerestudiedinthesecondstage．InthethirdstagewhenHRTaerobicsection+lowDOsectionwas10+5handinflowratiowas1∶1theoriginalC/Nwereadjustedfrom2∶13∶15∶1to10∶1.ToconcludetheoptimalparametersfornitrogenremovalinthebiofilmsystemwereasfollowsoriginalC/N=51inflowratioofaerobictolow-DOsection=1∶1HRTofaerobicandlow-DOsectionswere10hand5hrespectively．AsaresultCODammonianitrogenandtotalnitrogencouldberemovedfrom254mg/Lto48mg/L37.2mg/Lto9.3mg/Land48.2mg/Lto14.8mg/Lrespectively．Keywordsmunicipalwastewaterlowratioofcarbontonitrogenaerobic-lowDObiofilmprocessinflowratio、1SHARON2SND34．CANON5-OLAND．DOI:10.13227/j.hjkx.2011.10.03110-67、8～15．、16．、．-17．、HRTCODTNC/N．11.1、、、、EDTA-Na1．1COD100～500mg/LC/N2∶1～10∶1．1Table1Waterqualityindexes/℃25±2/mg·L－130.0～40.0pH7.0～7.7/mg·L－140.0～50.0CaCO3/mg·L－1220/mg·L－11.0～4.0COD/mg·L－1100～500/mg·L－10.0～1.01.2Φ240mm×1000mm、．150mm150mm、、．700mm50%0.032m3．50mm310mm13．1．2DO3.5～4.3mg/LDO0.9～1.1mg/L．2C/N3∶1C/NHRT、-HRT、2∶1～10∶1C/N-1.2.3.4.5.6.7.8.9.10.1Fig．1SchematicdiagramoftestinstallationC/N．2.1HRTC/N3∶1789232HRTC/N3∶1．1∶1．50%HRTHRTHRT．HRT15、12、96h30d．10d20dHRT-2．2HRT-Table2Substratesremovalperformancesinaerobic-lowDOlevelbiofilmwithvariousHRTCOD/mg·L－1NH+4-N/mg·L－1NO－2-N/mg·L－1NO－3-N/mg·L－1TN/mg·L－1/%/%/%101554670.337.60.897.90.61.11.723.549.637.430.2Ⅰ51034160.219.99.850.80.91.612.63.942.424.941.3151554173.537.69.873.90.61.61.73.949.624.949.781635765.038.51.097.50.50.81.524.747.835.924.9Ⅱ41134560.220.712.738.60.71.813.14.342.628.333.6121634572.438.512.767.00.51.81.54.347.828.340.861666560.837.91.695.80.41.31.621.448.541.215.1Ⅲ31175553.020.912.540.20.92.511.55.843.232.425.091665566.937.912.567.00.42.51.65.848.532.433.241505861.336.51.994.90.61.91.820.146.942.210.0Ⅳ21106739.120.612.141.31.36.811.07.242.535.716.061506755.336.512.166.80.66.81.87.246.935.723.92．．HRT15h6h、7.1%20.2%、25.3%25.9%COD9.0%、21.1%18.2%HRTCOD．HRT．COD∶TN＞218．HRTCODCOD．DODO．HRT．DO190.2～0.4mg/L1.2～1.5mg/LDO0.9～1.1mg/L．HRT2hHRT4hHRT．2.2C/N3∶1HRT10h3.2L/hpH7.0～7.725℃±2℃．1∶2、1∶12∶19.6、6.44.8L/hHRT3.3、56.7h．1∶12.1HRT15h．2.2.1．-889210-．．COD、、、、2．2Fig．2Low-DOfilterperformancesatvariousinflowratios2COD、、、．1∶2COD、518.0、107.5237.1mg/h．HRTHRT．HRT．HRT3.3hHRT6.7h．1∶2HRT3.3h77.8mg/h．SRT20HRT3.3h．1∶22∶1．421．2.0g/gMLSS/．43、、+．+/2/．＞0+．、+2∶1→1∶11∶1→1∶2．、、2/+－=－/3．3Table3Organicnitrogentransformationamountinlow-DObiofilmwithvariousinflowratios/L·h－1/mg·L－1/L·h－1/mg·L－1/mg·h－1//mg·h－1+-/mg·h－1∶=1∶23.210.36.49.03.2×10.3+6.4×9.0=90.651.890.6－51.8=38.8∶=1∶13.29.03.29.73.2×9.0+3.2×9.7=59.83.859.8－3.8=56.0∶=2∶13.210.51.69.23.2×10.5+1.6×4.2=40.341.740.3+41.7=82.01∶2、1∶12∶13+38.8、56.0、82.0mg/h．+．989232HRT、．22、．HRT、HRT+．/HRT2．HRT/．/2/．2.2.2-41∶2HRT3.3h20.8mg/LCOD2∶11∶1．HRT3.3h．COD．COD、1∶1．2.3C/N4-Table4Substratesremovalperformancesinaerobic-lowDOlevelbiofilmwithvariousinflowratios∶/L·h－1/mg·L－1/mg·L－1/%CODNH+4-NTNCODNH+4-NTNCODNH+4-NTN2∶14.815537.147.4386.932.875.381.430.61∶16.415537.649.6419.824.972.473.949.71∶29.615737.447.35318.320.866.351.156.01∶1HRT15hHRT10hHRT5h．DO0.9～1.1mg/LDO3.5～4.3mg/L25℃±2℃pH7.0～7.7．CODC/N2∶1、3∶1、5∶110∶1．1∶1C/N1.9∶1、2.5∶1、4.0∶17.8∶1．2.3.1C/NC/NCOD34．0～10h10～15hCOD．3C/NCODC/NCOD．COD3C/NCODFig．3CODremovalperformancesatvariousinflowC/NratiosCODCODDO23COD24CODCOD、099210-4C/NTNFig．4TNremovalperformancesatvariousinflowC/NratiosCODCODCODCOD．CODC/NCOD．DO