摘要
电镀废水中含有包括六价铬在内的多种重金属离子,采用了分类收集-预处理-铁/碳微电解-螯合沉淀的处理工艺,对电子元器件加工企业电镀车间产生的废水进行集中处理。通过对镀种情况分析、废水中重金属成分分析、重金属捕集剂(DTCR型)(固含量65%)投加量对处理效果的影响评定,确定处理方案。处理结果表明:最终pH值为8.5;当重金属捕集剂投加量为5 mL/L时,搅拌反应5 min,然后静置15 min。上清液中的残余铜(Ⅱ)、镍(Ⅱ)、锌(Ⅱ)和六价铬的质量浓度分别为0.24,0.34,1.20,0.16 mg/L,达到了《电镀污染物排放标准》(GB 21900—2008)中表2的限值要求。
Electroplating wastewater contains a variety of heavy metal ions including hexavalent chromium.A process of classified collection-pretreatment-iron/carbon micro-electrolysis and chelating precipitation was adopted to treat the wastewater from electroplating workshop of electronic components processing enterprises.The treatment scheme was determined by analyzing the plating conditions,analyzing the heavy metal components of wastewater and evaluating the influence of the amount of chelating precipitator(DTCR type)(solid content 65%)on the treatment effect.The processing results show that:The final pH value was 8.5;When the chelating precipitant dosage was 5 mL/L,Stir and react for 5 min,then let stand for 15 min.The concentrations of residual copper(Ⅱ),nickel(Ⅱ),zinc(Ⅱ)and hexavalent chromium in the supernatant were respectively0.24 mg/L,0.34 mg/L,1.20 mg/L and 0.16 mg/L.It has reached the limit requirements of Table 2 in(GB 21900—2008).
作者
余海宁
邵红艳
Yu Haining;Shao Hongyan(College of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550001,China;College of Mechanical Engineering Guiyang University,Guiyang 550005,China)
出处
《山东化工》
CAS
2022年第24期200-202,共3页
Shandong Chemical Industry
基金
2020年度基于产教深度融合培养喀斯特地区新型城镇化建设新工科人才实践平台建设(E-XTYR20200662)。
关键词
电镀废水
重金属
鳌合沉淀
排放标准
electroplating wastewater
heavy metals
chelation precipitation
emission standards
