摘要
为探索利用天然矿物进行高砷煤矿区AMD污染水体底质污染释放的原位控制,以高砷煤矿区AMD污染湖泊底质为研究对象,添加不同比例的碳酸钙和磷矿粉后,分别对AMD污染底质进行7 d的连续浸提试验,并测定浸提液中p H、Eh、EC、SO2-4、Mn、Zn、Cu、As等特征指标浓度,评价2种天然矿物组分对AMD污染底质的污染释放控制效果。结果表明:碳酸钙、磷矿粉的添加可显著地提高污染底质的p H,并显著降低污染底质的氧化还原电位以及Mn、Cu、Zn离子的溶出,但浸提液EC和SO2-4却有不同程度的升高,且碳酸钙处理后浸提液EC和SO2-4的增幅显著低于磷矿粉处理;磷矿粉处理对底质中As离子的溶出有明显的抑制效果,而碳酸钙处理的效果则不明显,因此磷矿粉可作为高砷煤矿地区酸性废水污染湖库底质二次污染防治的理想材料。
To evaluate the effects of calcium carbonate and phosphorus tailing on pollution control of AMD - contaminated sediment, we chose lake sediments as object, setting eight different adding pro- portions among 0 -10% for the two minerals, and measured main characteristics such as pH, EC, Eh and concentrations of SO4^2-, Mn, Zn, Cu and As after seven days＇ continuous leaching test for contaminated sediments. The results showed that calcium carbonate and phosphorus tailing could sig- nificantly improve pH value of contaminated sediment and reduce EC and lower concentrations of Mn, Zn, and Cu,but in the solution EC and S042- had a rise in different degree where the growing rate of EC and SO4^2- with carbonate treatment was lower than that with phosphorus tailing treatment. In addition, phosphorus tailing could remarkably inhibit the dissolution of As, while the calcium car- bonate＇s inhibition for As release was not so obvious. It could be concluded that phosphorus tailing could be the ideal material to treat AMD contamination in high -arsenic coal mine area.
出处
《环保科技》
2015年第1期1-5,共5页
Environmental Protection and Technology
基金
国家自然科学基金面上项目"高氟高砷煤矿区水环境复合污染生态毒性效应及其机理研究"(No.20977020)
贵州省重大科技专项"黔中水利枢纽重大关键技术应用研究"(黔科合重大专项字[2012]6009-7号)
关键词
AMD
污染底质
碳酸钙
磷矿粉
污染控制
acid mine drainage （AMD）
contaminated sediment
calcium carbonate
phosphorustailing
pollution control
