次氯酸钠氧化法脱除二级生化出水中氨氮的中试研究顾庆龙

3212200712ENVIRONMENTALSCIENCEANDMANAGEMENTVol.32No.12Dec.2007:2007-07-10:(1968-),,,。:1673-1212(2007)12-0097-04顾庆龙(,200135)　:用间歇和连续运行的方法对CODcr和NH3-N浓度分别约为200mg/L和30mg/L的二级生化出水进行了次氯酸钠氧化脱氮中试研究,考察了pH值、次氯酸钠溶液投加量和反应时间等工艺条件对脱氮效果的影响和中试工艺连续运行的稳定性。结果表明,次氯酸钠氧化脱氮的最适工艺条件是pH=7.5～8.5、次氯酸钠溶液(含有效氯10%)投加量为0.5%(v/v)、反应时间30min。处理量为9.6m3/d的中试装置在上述优化条件下连续运行15d,处理水氨氮全部达到排放标准。:氨氮;次氯酸钠;氧化;二级生化出水:X703.1:AThePilottrialofAmmonianitrogenRemovalfromSecondaryTreatmentEffluentbySodiumHypochloriteOxidationGuQinglong(ShanghaiPudongNewAreaEnvironmentalProtectionandMonitoringStation,Shanghai200135,China)Abstract:Asecondarytreatmenteffluent,whichCODcrvalueandNH3-Nconcentrationwereabout200mg/Land30mg/L,respectively,wasoxidizedbysodiumhypochloriteinapilotsettoremoveammonianitrogen.TheeffectofpH,sodiumhypo-chloritesolutiondosageandreactiontimeontheammonianitrogenremovalefficiencyandtheoperationalstabilityoftheoxidationprocesswereevaluated.TheresultsshowedthattheoptimalpH,sodiumhypochloritesolutiondosageandreactiontimeforsodiumhypochloriteoxidizingammonianitrogenwere7.5～8.5,0.5%(v/v)and30min,respectively.Thepilotsetwhichtreatmentcapacitywas9.6m3/doperatedunderaboveoptimalconditionsfor15days,andtheammonianitrogenconcentrationinthetrea-tedwastewaterallwerelowerthen15mg/L(localeffluentqualitylimit).Keywords:ammonianitrogen;sodiumhypochlorite;oxidation;secondarytreatment　　,。,。,,,。,。,。,,7.6。,,。。,pH、,。1　1.1　1.1.1　废水,(1)。,,,,15～30mg/L(·97·3212200712·Vol.32No.12Dec.2007,,30mg/L,15～30mg/L)。1.1.2　次氯酸钠,10%。1.2　1.2.1　间歇试验方法1200L,,pH,,,[1]。1-(100L);2-(100L);3-(100L);4-(200L);5-(200L);6-;7-;8-;9-pH1　1.2.2　连续试验方法1,,,15～30mg/L。,,pHpH。,,。2　2.1　pH[2]:1.5NaOCl+1.5H2O※1.5HOCl+1.5NaOH(1)NH3+HOCl※NH2Cl+H2O(2)NH2Cl+HOCl※NHCl2+H2O(3)0.5NHCl2+0.5H2O※0.5NOH+Cl-+H+(4)0.5NHCl2+0.5NOH※0.5N2+0.5HOCl+0.5H++0.5Cl-(5):NH3+1.5NaOCl※0.5N2+1.5H2O+1.5NaCl(6),NH3(NH+4)[3]。pH,:NH+4NH3+H+(7)Ka=[NH3][H+][NH+4]=5.62×10-10(8),NH3(9):NH3,%=[NH3]×100[NH3]+[NH+4]=1001+[NH+4]/[NH3]=1001+[H+]/Ka(9),pH,[H+],NH3,。,[2]:OCl-+H2O+2e-※Cl-+2OH-(E0=0.90V)(10)Nernst[4]E=E0-2.303RTnFlog[Cl-][OH-]2[OCl-](11),pH[OH-],E,pH,。,pH,pH,2。2　pH:reactionconditions:NaOCldosage=0.6%(v/v),reaction=60min。·98·3212200712·Vol.32No.12Dec.20072,pH8.0,,pH7.5～8.5。2.2　,,,。,,,,,3。3　　:reactionconditions:reactiontime=60min,pH=7.8～8.4。3,,0.5%(v/v)15mg/L(),。(6),1mg8mg(95.4%[2]),76mg(0.063mL)10%。NH3-N=30mg/L,NH3-N10mg/L,NH3-N=20mg/L。20mg/L1.26mL/L0.13%(v/v),0.2%(v/v),5%(3)。(CODcr=150～200mg/L),,。,,。,COD20%～30%。2.3　,。,pH,pH,,,4。4　4,,,30min,,3。,30min。,4,30mg/L,0.5%(v/v),=10～11mg/L,。2.4　,15,,5。5　:runningconditions:NaOCldosage=0.5%(v/v),pH=7.8～8.4,HRT=30min。,0.5%(v/v),pH=7.8～8.4HRT=30min,,,,。(下转第147页)·99·3212200712·Vol.32No.12Dec.2007ug,mg,。。1,,。1　min2468101418220.3540.3550.3550.3550.3540.3540.3550.3543　,0.03μg/L0.19μg/L,0.83%5.81%。。4　,2。,,50ug,,GB7466-87。2　mg/L%0.0150.011-26.70.0100.013+30.0　　0.1490.138-7.40.1670.169+1.2　　0.2400.223-7.10.8370.816-2.5()0.9450.958+1.4　　:[1]国家环境保护局《水和废水监测分析方法》编委会.水和废水监测分析方法(第3版)[M].北京:中国环境科学出版社,1989:359-361.(上接第99页)3　0.5%(v/v)(10%),,3.5/,300,。,,、,,,,。　　:[1]国家环保局.水和废水监测分析方法(第3版)[M].北京:中国环境科学出版社,1989:252-260.[2]MetcalfEddy.WastewaterEngineering:TreatmentandReuse(4rded.)[M].NewYork:MeGraw-HillBookCo.,2003,519:1235-1238.[3]BenefieldLD,JudkinsJF,WeandBL.Processchem-istryforwaterandwastewatertreatment[M].NewJersey:Pren-tice-Hall,EnglewoodCliffs,1982:102.[4]RonaldLD.Theoryandpracticeofwaterandwastewatertreatment[M].NewYork,J.WileyCo.,1997:44.·147·