氰化物污染地下水异位处理工艺研究与工程实践

Research and Engineering Practice of Ex-situ Treatment Process of Cyanide Contaminated Groundwater

以天津某氰化物污染场地产生的含氰废水为研究对象,采用过氧化氢氧化法和碱性氯化法联合使用的方式,考察过氧化氢氧化法使用过程中催化剂Cu^(2+)浓度、pH、过氧化氢用量对含氰废水氰化物去除率的影响,同时考察碱性氯化法使用过程中次氯酸钠用量对含氰废水氰化物去除率的影响。结果表明:在过氧化氢投加量为1.5%、p H为9、过氧化氢与硫酸铜用量比例为10∶1、次氯酸钠投加量为2.0%的反应条件下,过氧化氢氧化法和碱性氯化法联合工艺可使初始浓度234 mg/L的含氰废水降低至0.13 mg/L,满足0.20 mg/L的治理目标。

The cyanide-containing wastewater produced in a cyanide-contaminated site in Tianjin was taken as the research object.The hydrogen peroxide oxidation combined with alkali chlorination was adopt,to investigate the impact of Cu2+concentration of catalyst,pH and hydrogen peroxide dosage on the removal rate of cyanide from cyanide-containing wastewater in the process of hydrogen peroxide oxidation.Meanwhile,the influence of sodium hypochlorite dosage on the removal rate of cyanide from cyanide-containing wastewater in alkali chlorination process was investigated.The results showed that under the reaction conditions that the dosage of hydrogen peroxide was 1.5%,pH was 9,the dosage ratio of hydrogen peroxide to copper sulfate was 10∶1,and the dosage of sodium hypochlorite was 2.0%,the combined process of hydrogen peroxide oxidation and alkali chlorination could reduce the initial concentration of cyanide-containing wastewater from 234 mg/L to 0.13 mg/L,which could meet the treatment target of 0.2 mg/L.