沉淀中和共沉淀处理CODCr测定废液

沉淀-中和-共沉淀处理CODCr测定废液李富祥,程岩!(辽东学院城市建设学院,辽宁丹东118003):利用重铬酸钾法分析COD废液中Ag+Hg2+Cr3+的含量很高,研究采用∀沉淀-中和-共沉淀#法处理CODCr测定废液,经处理后Ag+由1235.2mg/L降低为0.011mg/L,Hg2+由1634.7mg/L降为0.024mg/L,Cr3+由255.1mg/L降为0.082mg/L,结果表明经处理后的废液达到国家规定的污染物排放标准的要求,可直接排放此外,该方法还可对银汞等金属进行回收利用,具有较好的环境效益和经济效益:沉淀∃中和∃共沉淀;CODCr测定废液;回收利用:X703.1:A:1673-4939(2009)04-0302-04COD,CODCODCr,,,,,,CODCrAg+Hg2+[1-3],,3∀--#CODCr,,,,11.1废液的组成CODCrCODCl-GB11914-89CODCr,CODCr300mg/L,K2Cr2O7COD,20mL,0.4gHgSO4,30mLH2SO4(0.3gAg2SO4),10mL0.2500mol/LK2Cr2O7,90mL,17.5mL0.1mol/LFe(NH4)2(SO4)2,165mL,H2SO43.35mol/L,CODCr11CODCrAg+Hg2+Cr3+Fe3+K+(g)0.2080.2700.0430.0980.034(mg/L)1260.61636.4260.6593.6206.11.2废液的危害,Cr3+,pH,Cr6+Ag+,第16卷第4期辽东学院学报(自然科学版)Vo.l16No.42009年12月JournalofEasternLiaoningUniversity(NaturalScience)Dec.2009!:(40871019):2009-10-30:(1977∃),,,,,,:,Hg2+,,,,CODCr22.1仪器和试剂:UV1102-,Z-8000,PHS-3BpH,HH%S21-8,LG50B,AG204:NaClNa2CO3NaOHH2SO4Na2S%9H2OFeSO4%7H2O()2.2工艺流程∀∃∃#CODCr,12.3分析方法[4],,,,,pH33.1银的处理和回收利用3.1.1,NaCl,:Na++Cl-+Ag+=AgCl&+Na+(1)[2],NaCl2~550∋~70∋2,98%NaCl260∋,,AgCl98.8%,1.65gAgCl3.1.2[3],AgClH2SO4-Ag2SO4,Ag2SO4CODCr,CODCr,22CODCrCODCr(mg/L)(mg/L)(mg/L)(%)(%)100103.298.13.2-1.9200204.2203.02.11.5300291.9303.3-2.71.1400390.4394.8-2.4-1.3500514.5491.52.9-1.72,Ag2SO4CODCr,Ag2SO4,,CODCr%303%第4期李富祥,程岩:沉淀-中和-共沉淀处理CODCr测定废液3.2Cr3+和Fe3+的处理(,,,H2SO43.35mol/L,(NaOH),475g/LNa2SO4,20∋,Na2SO4194g/L,Na2SO4%10H2O,,Cr(OH)3Fe(OH)3,(2.5Cr3+Fe3+Cr(OH)3Fe(OH)3Fe(OH)3Cr(OH)3pH2.15.0,pH3.26.0;HgOpH7.5,Hg2+Cr3+Fe3+,pH7.0,Na2CO3(150g/L),pH5.0,20%NaOHpH7.0,Cr3+Fe3+Cr(OH)3Fe(OH)3,Cr3+Fe3+97.4%96.7%,)Cr3+Fe3+6.63mg/L18.7mg/L(Cr3+Fe3+)Cr(∗)Fe(∗),,3.3Hg2+的处理及回收利用3.3.1Hg2+)Na2S,Hg2+HgS,HgS,,HgSFeSHg2+Hg2+)Na2S,pH9,HgS,7%FeSO4,S2-FeS,HgS,)Cr3+Fe3+Cr2S3Fe2S3,H2SO4,,HgS,Hg2+99%,1.12gHgS3.3.2Hg2+[4][5],HgS,20%NaOHHgOHgO,H2SO4HgSO43.4处理前后废液成分的比较,,Ag+Hg2+Cr3+Fe3+,∗33(mg/L)∗(mg/L)(mg/L)Ag+1235.20.0110.5Hg2+1634.70.0240.05Cr3+255.10.0821.5Fe3+566.40.243--pH--8-96-9:(GB8978-1996),,44.1结论(1)∀∃∃#CODCr,,,,(2)NaCl,,,Ag2SO4CODCr,CODCr(3)Na2CO3NaOHpH7,Cr3+Fe3+Cr(OH)3Fe(OH)3,97.4%96.7%(4)Hg2+,Hg2+HgSFeS,HgSHgO%304%辽东学院学报(自然科学版)第16卷HgSO44.2建议(1),,(,,;((2)(Cr(OH)3Fe(OH)3,,Cr(OH)3Fe(OH)3pH,Cr(OH)3(3)+Cr3+,Cr3+,;,(:[1]陈丽娜.垃圾渗滤液中COD测定废液里银的回收及利用[J].环保科技,2008,14(4):47-48.[2]刘宏,陈庆邦.从测定CODCr后的含银废液中回收银的试验[J].广东工业大学学报,1999,16(2):52-55.[3]王俊荣.CODCr测定废液中银的回收和利用[J].工业用水与废水,2005,36(3):16-18.[4]国家环保总局,水和废水监测分析方法−编委会.水和废水监测分析方法(第4版)[M].北京:中国环境科学出版社,2002.[5]张泉泓,徐洪波.废液中汞的回收和利用[J].辽宁化工,1997,26(2):90.[6]姚淑霞,霸书红.废液中CODCr的治理与应用[J].中国环境管理干部学院学报,2004,14(2):27-29.(:王漓江)TreatingWasteLiquidofCODCrTestwithSedimentation-neutralization-coprecipitationMethodLIFu-xiang,CHENGYan(CollegeofUrbanConstruction,EasternLiaoningUniversity,Dandong118003,China)Abstrac:tThereishighAg+,Hg2+andCr3+contentinthewasteliquidofCODCrtes.tAftertreatingthewasteliquidwithsedimentation-neutralization-coprecipitationmethod,Ag+contentreducedfrom1235.2mg/Lto0.011mg/L,thatofHg2+from1634.7mg/Lto0.024mg/L,andthatofCr3+from255.1mg/Lto0.082mg/L.Thetreatedliquidmeetsthedemandofthenation-specifiedpollutantdischargestandardsandcanbedischargeddirectly.Inaddition,bythismethod,silverandmercurycanberecycledandreused;therefore,thismethodhasbetterenvironmentalbenefitandeconomicbenefi.tKeywords:sedimentation-neutralization-coprecipitation;wasteliquidofCODCrtests;recycling(上接第280页)AchievingAll-respectHarmoniousandSustainedDevelopmentofEasternLiaoningUniversityGuidedbytheScientificOutlookonDevelopmentLISheng-hu(EasternLiaoningUniversity,Dandong118001,China)Abstrac:tEasternLiaoningUniversityhasbeenfoundedforsixyearssince2003.Inthissixyears,theCPCcommitteeoftheuniversitypersistsonthesocialistschool-runningdirectionandworksundertheguidanceoftheScientificOutlookonDevelopmen.tTheuniversityhasscoredremarkableachievementsonreform,developmen,teducation,Partyconstruction,politicalwork,administrationandsocialservice.Keywords:theScientificOutlookonDevelopmen;tEasternLiaoningUniversity;school-runningmechanism;educationalreform%305%第4期李富祥,程岩:沉淀-中和-共沉淀处理CODCr测定废液