次氯酸钠氧化脱除化学镀镍废水中的氨氮

37120191EnvironmentalEngineeringVol．37No．1Jan．2019*12121.4100822.518055、。NaClO、、pHNaClO1800mg/L30minpH6.0～7.010～30℃。91%15mg/LGB21900—2008《》2。。NaClODOI10.13205/j．hjgc．201901018ＲESEAＲCHONＲEMOVALOFAMMONIANITＲOGENINELECTＲOLESSNICKELPLATINGWASTEWATEＲBYNaClOOXIDATIONJIAXiao-ling12KEShui-zhou1ZHUJia21.CollegeofCivilEngineeringHunanUniversityChangsha410082China2.CollegeofArchitectureandEnvironmentalEngineeringShenzhenPolytechnicShenzhen518055ChinaAbstractInviewofhighammonianitrogenconcentrationinelectrolessnickelplatingwastewaterandtreatmentdifficultiesNaClOoxidationmethodwasusedtoremovetheresidualammonianitrogeninthewastewatertakingthepre-treatedactualelectrolessnickelplatingwastewaterasthetestobject．TheeffectsoftheNaClOsolution’sdosagereactiontimeinitialpHvalueandreactiontemperatureontheremovalefficiencyofammonianitrogenwerestudied．TheresultsshowedthatthesuitablereactionconditionswereasfollowsthedosageofNaClOsolutionwas1800mg/Lthereactiontimewas30mintheinitialpHwas6.0～7.0andthereactiontemperaturewas10℃～30℃．Underthisconditiontheremovalrateofammonianitrogeninthewastewaterwasover91%andtheresidualammonianitrogenconcentrationwaslowerthan15mg/LwhichmettherequirementsinTable2ofGB21900—2008EmissionStandardofPollutantsforElectroplatingaboutammonianitrogendischarge．TheresultsshowedthatNaClOoxidationasanadvancedtreatmentmethodwashighlyefficientandfeasibleinremovingammonianitrogenfromelectrolessnickelplatingwastewater．KeywordselectrolessnickelplatingwastewaterammonianitrogenNaClOoxidationadvancedtreatment*51478274JSKF20150901115155532。2018－03－3001。、pH2。、、、。、3。8、COD、、、37。GB21900—2008《》4。56。。GB21900—2008215mg/L。8mg/L。。7。8。、ADC、9-13＜50mg/L＞200mg/L。14。。GB21900—2008215mg/LNaClO、、pH。11.1、、、、、、ρ＜0.08mg/L、ρSS＜20mg/Lρ100～120mg/L。120mg/LpH6.0～7.0200mL。1.2NaClO8%、98%、NaOH。SQPIKACOLOＲSQUIDTHD-0515SHZ-BpH3210SET-2pHT6。1.3NH3－N。pHpH3210SET-2pH。1.4。200mLpHNaClO300r/min。2。22.1NaClO25～27℃pH=2.030min300r/min。200mLpH2.0400～4000mg/LNaClO30minNaClO1。—●——□—。1NaClOFig．1EffectofNaClOsolutiondosageonammoniaremoval1NaClO。NaClO400mg/L90.3mg/L24.50%。7。1800mg/L14.1mg/L88.21%。NaClO2000mg/L4913.8mg/L96.81%。NaClO。5mg/L。NaClO3600mg/L1mg/L99.33%。2NH3+3NaCIO→N2↑+3H2O+3NaCl11NaClO1g7.6g91L0.12g0.912gNaClO912mg/L。NaClO912mg/L60%COD10%。。9。2.225～27℃200mLpH=2.0300r/min168018002000mg/LNaClO10min。3NaClO2。—●—1680mg/L—□—1800mg/L—◆—2000mg/L。2Fig．2Effectofreactiontimeonammonianitrogenremoval2NaClO。810min25mg/L。20min17.012.04.0mg/L3NaClO。pH1030min、。30minNaClO168018002000mg/L18.714.13.8mg/L。NaClO1800mg/L14.1mg/LGB21900—2008215mg/L。2.3pH25～27℃200mLpH300r/minNaClO1800mg/L30minpH3。pHpHpH4。—●——□—。3pHFig．3EffectofinitialpHonammoniaremoval4pHFig．4ChangesinpHbeforeandafterthereaction3pH。pH5937NaClO。NaClOHClONaClO+H2O→HClO+NaOH2pH2.0NaClOCl2pH9.0ClO－15。NaClO。pH1.5NaClOCl2。7.1mg/L。4pH2.0HClO。pH1.5～3.094.06%79.35%。pHNaClO16。pH3.0～7.0pH92.73%。NaClOHClONH3NH+4HClO173NH+4NH3+H+3pHNH3NH3－NN2。pH7.0NaClOClO－。4NaClOpHpH。pH2.0～6.0pH。NH3+HClO→NH2Cl+H2O4NH2Cl+HClO→NHCl2+H2O5NHCl2+H2O→NOH+2Cl－+2H+6NHCl2+NOH→N2↑+HClO+H++Cl－76H+pHNaClONaOHpH。pH6.0～7.0pH6.0～9.0pH2.0pH8.2pHpH6.0～7.0pHpH9.69.0pH2.0。3pH6.0～7.010mg/L92%pH2.088.21%。pH6.0～7.0。2.4200mLpH6.0～7.0300r/minNaClO1800mg/L30min。5。—●——□—。5Fig．5Effectofreactiontemperatureonammonianitrogenremoval5。10℃13.2mg/L88.96%。15～30℃10mg/L91%。1783NaClO→NaClO3+2NaCl886%。35℃＞15mg/L。10～30℃15.0mg/L。10～30℃、。2.54NaClO1800mg/L30minpH6.0～7.010～69130℃。100200300400500mL6。100mL500mL。GB21900—20082。—●——□—。6Fig．6Effectofwaterquantityonammonianitrogenremoval310～30℃。NaClO1800mg/L30minpH6.0～7.0300r/min10～30℃10mg/L91%GB21900—20082。、、。1．D．2012．2．Fenton－J．201737661-65．3．D．2015．4．J．20143320891-895．5．J．2008261142-143155．6．D．2005．7．J．20071297-99147．8．J．200940323-26．9．J．2014335214-216．10．J．2008863-6578．11．J．2013239-42107．12．ADCJ．20061135-36．13．－Fe2+/NaClOJ．20144115-6．14．OＲPJ．201748515-1840．15．J．2006828-30．16DrosteＲonaldL．TheoryandpracticeofwaterandwastewatertreatmentM．NewYorkJWiley199744．17BenefieldLDJudkinsJFWeandBL．ProcesschemistryforwaterandwastewatertreatmentM．NewJerseyPrentice—Hall．EnglewoodCliffs1982102．1992－。[e-mail]1964－。[e-mail]79