沉淀-中和-共沉淀处理COD_(Cr)测定废液

Treating Waste Liquid of COD_(Cr) Test with Sedimentation-neutralization-coprecipitation Method

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1235.2 mg/L降低为0.011 mg/L,Hg2+由1634.7 mg/L降为0.024 mg/L,Cr3+由255.1 mg/L降为0.082 mg/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。

There is high Ag^＋,Hg^2＋ and Cr^3＋ content in the waste liquid of CODCr test.After treating the waste liquid with sedimentation-neutralization-coprecipitation method,Ag＋ content reduced from 1 235.2 mg/L to 0.011mg/L,that of Hg^2＋ from 1 634.7mg/L to 0.024 mg/L,and that of Cr^3＋ from 255.1 mg/L to 0.082 mg/L.The treated liquid meets the demand of the nation-specified pollutant discharge standards and can be discharged directly.In addition,by this method,silver and mercury can be recycled and reused;therefore,this method has better environmental benefit and economic benefit.