次氯酸钠氧化脱除废水中氨氮的研究张胜利

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,,(,610031),。,[1]。,(NaClO),(DBPs)[2],。[3]NaClOADC,。[4],NaClO。[1]NaClO,:2008-12-09;:2009-01-16:,,,。100mg/L,、pH。,、、pH。,,,,,。:;;;;pH;:X703:A:%1009-2455(2009)03-0023-04Removalofammonia-nitrogenfromwastewaterbysodiumhypochloriteoxidizationZHANGSheng-li,LIUDan,CAOChen(SchoolofEnvironmentalScienceandEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Comparedwithtraditionalchlorineseriesoxidants,sodiumhypochloritecannotonlyavoidtheleakageofchlorine,butcanfurtherreducethedisinfectionbyproductsaswell,therefore,itisanappropriatechlorineoxidantforNH3-Nremoval.Withsimulantammonia-nitrogenwastewaterwhosemassconcentrationwas100mg/Lasthestudyobject,theeffectsofmassratioofchlorinetoammonia-nitrogen,reactiontime,pHvalueandsomeotherfactorsonsodiumhypochloriteremovingammonia-nitrogenweresystematicallystudiedthroughorthogonaltestandsingle-factortest.Theresultsshowedthat,theinfluencedegreeoftheabovefactorspresentedthefollowingdescendingorder:massratioofchlorinetoammonia-nitrogen,reactiontime,pHvalue.Besides,theeffectofphenolonammonia-nitrogenremovalundertwodifferentammonia-nitrogenconcentrationswasalsoinvestigated,itwasfoundthat,theremovalrateofammonia-nitrogenunderthetwoconditionsdecreasedwiththeincreasingofthephenolconcentration,andtheinfluencedegreeofphenolonammonia-nitrogenwithlowconcentrationwasgreaterthanthatwithhighconcentration.Keywords:sodiumhypochlorite;ammonia-nitrogen;massratioofchlorinetoammonia-nitrogen;reactiontime;pHvalue;phenolINDUSTRIALWATER&WASTEWATERVol.40No.3Jun.,2009·23·INDUSTRIALWATER&WASTEWATERVol.40No.3Jun.,2009。、pH,,。1,、(NH2Cl)、(NHCl2)(NCl3)。NCl3pH<5.5,,10-7mol/L,,NCl3[4]。[5-6]:NaClO+H2O→HClO+NaOH(1)NH3+HClO→NH2Cl+H2O(2)NH2Cl+HClO→NHCl2+H2O(3)NHCl2+H2O→NOH+2Cl-+2H+(4)NHCl2+NOH→N2↑+HClO+H++Cl-(5):2NH3+3NaClO→N2↑+3H2O+3NaCl(6),,。22.1FA2004N,pHS-3C,722S,78HW-1。(6.36%)、、NH4Cl、H2SO4、Na2S2O3。2.2(NH3-N),,pHpHS-3C。2.32.3.1100mg/L。,(A)、(B)pH(C),L9(33)。,1。,,、pH,,,。2.3.2,,(Cl2)1.5∶1(7.6∶1),、、、,7.6mg。,,。33.1,2。2,,:A>B>C,>>pH。3.23.2.1,pH7~9,30min,1Tab.1FactorsandlevelsoforthogonaltestAB/minC11.510421.620831.730122Tab.2OrthogonaltestresultABC/%111141.74212266.22313367.80421267.17522367.49623174.48731365.26832182.43933287.83K158.5958.0666.22K269.7172.0573.74K378.5176.7066.85R19.9218.647.52·24·,,:,12。12,:①0.96,,,83.0mg。②1.76,,,28.24mg。,,:1∶1,(2)NH2Cl,NH2Cl。,NH2Cl,,,。1∶1,NH2ClNHCl2。NHCl2,,。1.76,;,,NH2Cl、NHCl2NCl3,,。3.2.2,pH7~9,0.72、1.451.76,,3。3,,10min,39.6%、59.2%88.8%。,,1.76。3.2.1,3,NH2ClNHCl2。,NH2Cl,,1.76,100%。3.2.3pH,30min,1.35,pH,4。4,pH,,,pH7~9。pH10,,,,,。1Fig.1Effectofmassratioofchlorinetoammonia-nitrogenonremovalrateofammonia-nitrogen0.20.61.01.41.82.2100806040200/%2Fig.2Effectofmassratioofchlorinetoammonia-nitrogenonresidualchlorine0.20.61.01.41.82.2100806040200m()/mg3Fig.3Effectofreactiontimeonremovalrateofammonia-nitrogenunderdifferentCl2∶Nmoleratioconditions102030405060/min100806040200/%0.721.451.764pHFig.4EffectofpHvalueonremovalrateofammonia-nitrogen56789101112pH56555453525150/%·25·INDUSTRIALWATER&WASTEWATERVol.40No.3Jun.,2009,pH9,,pH,,pH。,pH,50.95%~55.7%,。pH,pH,。3.3,pH7~9,30min,100mg/L2400mg/L2.3mL5.0mL,,5。5,,,。100mg/L,0mg/L100mg/L,69.39%30.0%;,2400mg/L,0mg/L100mg/L,44.82%37.9%。:,,,,。,,,。4(1):>>pH。(2),、pH。:,,,;,。,。,NH2ClNHCl2。NH2Cl,,,100%。pH5~11,。pH,。(3),,。:[1].[J].,2007,32(12):97-99.[2],,.[J].,2005,36(6):14-16.[3],,.ADC[J].,2006,(11):35-36.[4],,.[J].,2007,26(3):25-28.[5]WhiteGC.TheHandbookofChlorination[M].NewYork:VanNostrandReinhold,1986.[6]Metcalf,Eddy.WastewaterEngineering:TreatmentandReuse[M].NewYork:MeGraw-HillBookCo,2003.:(1976-),,,,,,()028-87600615()zsl123124@yahoo.com.cn。5Fig.5Effectofphenolonremovalrateofammonia-nitrogenunderdifferentammonia-nitrogenconcentrations20406080100ρ()/(mg·L-1)80706050403020/%  ρ()=100mg/Lρ()=2400mg/L·26·

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