聚羟肟酸捕集剂处理含铜废水的研究

On Treatment of Wastewater Containing Copper by Chelating Agent of Polyhydroxamic Acid

研究了聚羟肟酸捕集剂对水中Cu^(2+)的螯合去除功能,考察了pH值、捕集剂加入量、处理时间对去除率的影响.结果表明:在pH=5.5～6,聚羟肟酸用量为Cu^(2+)质量的3.4倍,处理时间为50min时,Cu^(2+)的去除率达99.73%,处理后的废水达到了国家《污水综合排放标准》.该法与碱中和法所得Cu^(2+)沉淀相比,其铜离子的浸出量仅为后者的1/315.故聚羟肟酸处理含Cu^(2+)废水具有更好的环境安全性.对聚羟肟酸捕集剂与Cu^(2+)的螫合去除机理进行了初步探讨.

The ability of a polyhydroxamic acid chelating agent for removal of Cu^2＋from wastewater was studied. The efficiencies of pH and dosage of chelating agent ,as well as the treatment time were investigated. The results showed that： 99.73% of Cu^2＋can be removed by polyhydroxamic acid at pH = 5.5- 6.0,when the dose of polyhydroxamic acid was 3.4 times of that of Cu^2＋in 50min. After the treatment, the wastewater can reach the Integrated Wastewater Discharge National Standard. The amount of dissolved Cu^2＋from sediments by polyhydroxamic acid was 1/315 of that from sediments by alkali neutralization. So, using polyhydroxamic acid as the chelating agent for the treatment of Cu^2＋ in treatment was found to have higher security of environment The mechanism of chelating between polyhydroxamic and Cu^2＋ was also discussed.