电流强度对电化学产氢自养反硝化脱氮效率的影响周欲飞

、、。。。。、。NO3--N[1]。1/2O2+H2O+2e-→2OH-e0=0.401V12H2O+2e-→2OH-+H2e0=-0.828V22NO3-+5H2→N2+4H2O+2OH-3C+2H2O→CO2+4H++4e-4。。30℃、pH7.5、NO3--N30mg·L-1、HRT10h。7mA160mA。11.130mg·L-1MgSO4·7H2O23mg·L-1、MgCl2·6H2O158mg·L-1、K2HPO4·3H2O8.5mg·L-1、KHCO313mg·L-1、CaCl2·2H2O20mg·L-1、FeSO4·7H2O1mg·L-1。1.21。100mm270mm2.3L。85PPI、500g·m-2、2.5mm、Φ270mm×330mm。1300mm、10mm。。。。31002930℃、pH7.5、NO3--N30mg·L-1、HRT10h0～160mA。0～100mANO3--NNO2--N06.86mg·L-11.80mg·L-1。X703.1A1000-3770(2010)09-0038-0042009-11-02“”[e-mail]36920109TECHNOLOGYOFWATERTREATMENTVol.36No.9Sep.,201038DOI:10.16796/j.cnki.1000-3770.2010.09.0101.310.45μm1h。pH、NO3--N、NO2--N、TN。pHpHS-3CNO3--NNO2--NN-(1-)TN。[2]。1.4。20dC/N1。。30mA、30℃、pH7.5NO3--N。。22.12.1.1NO3--NNO3--N、NO3--N2。2NO3--N。7mA3.4%。NO3--N84mA68%65%NO3--N10mg·L-19.4mg·L-1。110mA84.5%NO3--N4.6mg·L-1。NO3--N3。3R20.9564。NO3--N。Mellor[3]。。Park[4]NO3--N。NO3--N3NO3--NFig.3CorrelationbetweencurrentintensityandNO3--Nremovalefficiency020406080100120020406080100
mA1Fig.1Theexperimentalset-up
2NO3--NFig.2Effectofcurrentonnitrateremoval0204060801001201401601804812162024283236
/mA
NO-N/mgL020406080100 39。2110mA。110mANO3--N。“”[5]NO3--N。[6]NO3--N。2.1.2TNTN4。4TN。30%80mATN20%145mATN71%。24NO3--NTN35mANO3--NTNNO2--N。TNNO2--NNO2--N。NO2--NTN。2.1.3NO2--NNO2--NNO2--N。5。5NO2--N10mANO2--N。NO2--N100mA6.86mg·L-1。100mANO2--N。0～20mANO2--N1mg·L-1。NO3--N15%。4NO3--N→NO2--N→NO→N2O→N2。NO2--NNO3-N21。NO3--NNO2--N。20～100mANO3-NNO3--N。。NO2--N。。NO3--NNO2--NNO2--NNO。2NO3--NNO2--NNO2--N[7]。NO2--N100mA。NO2--N。NO2--N160mA1mg·L-1。NO3--N。NO3--NTN。020406080100120140160180012345678
/mA
NO-N/mgL5NO2--NFig.5Effectofcurrentintensityonnitriteconcentrationoftheeffluent4TNFig.4EffectofcurrentintensityonTNremoval0204060801001201401601800510152025303540
/mA
TN/mgL020406080100 36940NO3--N。NO2--N。2.2。。CO2pH6。CO2、[8]。。330℃、pH7.5、NO3--N30mg·L-1、HRT10h0～100mANO3--N100mA160mANO3--N84.5%60.4%。NO3--NTN35mA。。[1],,,.-[J].,2008,31(2):83-87.[2],.[M].4.,2002.[3]MellorRB,RonnenbergJ,CampbellWH,etal.Reductionofnitrateandnitriteinwaterbyimmobilizedenzymes[J].Nature,1992,355:717-719.[4]ParkHI,KimDK,ChoiYJ,etal.Nitratereductionusinganelectrodeasdirectelectrondonorinabiogfilm-electrodereactor[J].ProcessBiochemistry,2005,40:3383-3388.[5]ZhouMH,FuWJ,GuHY,etal.Nitrateremovalfromgroundwaterbyanovelthree-dimensionalelectrodebiofilmreactor[J].ElectrochimicaActa,2007(52)6052-6059.[6],,,.[J].,2004,24(5):519-523.[7]RivettMO,BussSR,MorganP,etal.Nitrateattenuationingroundwater:Areviewofbiogeochemicalcontrollingprocesses[J].WaterResearch,2008,42(16):4215-4232.[8],.[M].:,2006.0204060801001201401600123456789
pHmA6pHFig.6CorrelationbetweencurrentintensityandpHnearbyanodeEFFECTOFCURRENTINTENSITYONTHENITROGENREMOVINGBYELECTROCHEMICALHYDROGENAUTOTROPHICDENITRIFICATIONPROCESSZhouYufei,ZhaoGuozhi,TianGuangming,LiWenhong（CollegeofEnvironmentalandResourceSciences,ZhejiangUniversity,Hangzhou310029,China）Abstract:Thecurrentintensityeffectonelectrochemicalhydrogenautotrophicdenitrificationwasinvestigated,whenthetemperaturewas30℃,thepHwas7.5,thenitrateconcentrationoftheinfluentwas30mg·L-1,theHRTwas10h.Theresultsshowedthat,whenthecurrentintensitybetween0mAand100mA,therewasapositivelinearcorrelationbetweenthecurrentintensityandNO3--Nremovalefficiency.Withthecurrentincrease,thenitriteconcentrationoftheeffluentfirstincreasedandthendecreased.Buthighcurrentintensitycouldinhibitedenitrificationefficiency.Keywords：currentintensity;electrochemicalhydrogenautotrophic;denitrification!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!41