电镀废水处理站DTCR辅助氢氧化物沉淀工艺改造_王本洋

54　　　给水排水　Vol.37　No.6　2011电镀废水处理站DTCR辅助氢氧化物沉淀工艺改造王本洋　简　丽(中国航空规划建设发展有限公司第二设计研究院,北京　100120)　　摘要　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。关键词　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,