电镀废水处理站DTCR辅助氢氧化物沉淀工艺改造王本洋

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54    Vol.37 No.6 2011DTCR王本洋 简 丽(, 100120)   某废水处理站改造前采用传统氢氧化物沉淀工艺处理高浓度含铬、氰镉电镀废水,运行不稳定,出水不能达标排放。工艺改造后增加了高分子重金属捕集沉淀剂DTCR辅助去除重金属,在含铬废水DTCR投加量为50mg/L、含氰镉废水DTCR投加量为10mg/L条件下,出水总铬、镉分别稳定在0.5mg/L、0.2mg/L以下,远低于《电镀污染物排放标准》(GB21900—2008)限值。 电镀废水 DTCR 沉淀 重金属 铬 氰镉ImprovementoftheDTCR-assistanthydroxideprecipitationprocessinelectroplatingwastewatertreatmentstationWangBenyang,JianLi(SecondDesignandResearchInstitute,ChinaAviationPlanningandConstructionDevelopmentCo.,Ltd.,Beijing100120,China)Abstract:Beforereconstructionproject,somewastewatertreatmentstationusedthetradition-alhydroxideprecipitationprocesstotreatelectroplatingwastewaterwhichcontaininghighconcen-trationchromiumandcadmiumcyanide,butthetreatmenteffectwasnotstableandeffluentcouldnotmeetthedischargestandards.Afterimprovement,thepolymerheavymetalchelatingagentDTCRwasusedtohelpheavymetalremoval.WhentheDTCRdosageforchromiumwastewaterandcadmiumcyanidewastewaterwere50mg/Land10mg/Lrespectively,thetotalchromium,cadmiumineffluentwerestabilizedbelow0.5mg/Land0.2mg/Lrespectively,whichwasfarbe-lowthestandardsofEmissionstandardofpollutantsforelectroplating(GB21900—2008).Keywords:Electroplatingwastewater;DTCR;Precipitation;Heavymetal;Chromium;Cad-miumcyanide  。2001,《》(GB8978—1996)。,,[1,2]。200881《》(GB21900—2008),,。1 1.1 ,8h,、、400m3/d。1。1 /m3/h15Cr6+60~100mg/L,pH4~510 CN-10~30mg/L,Cd2+2~4mg/L,pH8~918pH4~615pH8~91.2 ,DOI:10.13789/j.cnki.wwe1964.2011.06.008 Vol.37 No.6 201155   1。pH2~2.5Na2S2O5,Cr6+Cr3+,pH8.5~9,;NaClO,pH10~11CN-CNO-,,pH11.5~12Cd2+,。1 1.3 (1)1,,,4m×5m×4m,HRT4.5h。2(11),15m3/h,12m。(2)1,PVC,3m×1.5m×1.8m,2,HRT30min。(3)1,,PVC,2m×1.5m×1.5m,HRT15min。(4)1,,,HRT1h,0.4MPa,35%。(5)2,,,1.5m×3.5m,10m/h。(6)1,,,3m×5m×4m,HRT5h。2(11),10m3/h,12m。(7)1,,PVC,3m×1.5m×1.8m,2,HRT40min。(8)1,PVC,2m×1m×1.5m,HRT15min。(9)1,,,HRT1h,0.4MPa,35%。(10)2,,,1.2m×3m,10m/h。1.4 ,Cr6+50mg/L,Cd2+1mg/L,《》(GB8978—1996)。2005,,Cr6+100mg/L,Cd2+4mg/L,。200881《》(GB21900—2008),GB8978—19961.5mg/L1mg/L,0.1mg/L0.05mg/L,。2 280m2,,、、、。,,,[3~5]。(DTCR1)。DTCR,,,(TDC)。15min,1,15min;pH,NaOHpH,DTCR、PACPAM。3 ,Cr6+80~100mg/L,Cd2+3~4mg/L。,2mg/L,0.08mg/L。DTCR,,《》(GB21900—2008)。56    Vol.37 No.6 20113.1 pHDTCRDTCRpH5~13,pH。pH,,pH;pHDTCR,DTCRpH。3.1.1 pHDTCR2,,pH8.5~9,2mg/L,;pH9,Cr(OH)3,。DTCR,DTCR40mg/L,pH6~10,DTCR;pH7~9,pH,0.75mg/L。DTCR,DTCR,DTCR;pH7~7.5DTCR,,DTCR。2 pHDTCR3.1.2 pHDTCR3,,pH11.5,0.1mg/L;pH,,0.08mg/L,。DTCR,pH11,5mg/LDTCR,0.05mg/L,。3.2 DTCR3.2.1 DTCRpH7~7.5DTCR,3 pHDTCRDTCR4。0~40mg/L,DTCR;,,50mg/L,0.5mg/L,GB21900—2008。DTCR,0.2mg/L,,DTCR。4 DTCR3.2.2 DTCRpH11~11.5DTCR,DTCR5。10mg/L,0.02mg/L。4 ,pH7~8、DTCR50mg/L;pH11~12、DTCR10mg/L。, Vol.37 No.6 201157   5 DTCR2 GB21900—2008/mg/L60~1002~40.3~0.51/mg/L2~40.08~0.100~0.020.05,2。7.8,0.8,、7。,、3.5/m32.9/m3。DTCR,、4.2/m33.1/m3。、0.7/m30.2/m3,,。5 (1),DTCR,,。(2)DTCR,pH,、。(3),DTCR50mg/L,0.5mg/L;,DTCR10mg/L,0.02mg/L,、GB21900—2008。参考文献1 ,..:,20002 ,,,..,2003,23(4):33~353 ..,2005,6(9):83~854 ,,,.DTC(EDA).,2006,25(6):765~7675 ,,.DTCRCr3+,Cu2+,Ni2+.,2008,36(3):68~71  §:10012012:(010)62038278E-mail:janryjian@163.com:2011-01-05:2011-03-30创新理念 让科技发挥效益  ,,。1957,,,。、,,,,5~6h,。,,,,“+”。、,,、,,50%。,,,,,。2010,5(),,36000m3/d,,。(通讯员 张志军)

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