某尾矿废弃地土壤重金属污染调查与治理研究

Investigation on the Soil Heavy Metal Contamination of a Abandoned Tailing Land and Its Soil Remediation

在取样分析的基础上,对葫芦岛钼矿区废弃尾矿库及其周边地区的土壤重金属污染状况和土壤肥力质量状况进行了评价,并以此为依据开展了研究区的土壤改良和植物修复研究。评价结果表明:废弃尾矿库及其周边土壤重金属污染严重,前者以Pb,Zn污染为主,后者以Cd,Zn污染为主;废弃尾矿库土壤非常贫瘠,附近耕地土壤则氮、磷不足。通过试验发现:施用经过堆肥化处理的城市污泥,可以改良被污染土壤;高羊茅、早熟禾、黑麦草以及沙棘可以作为先锋植物品种应用于研究区的植物修复工程中。

The soil heavy metal contamination and soil fertility of the abandoned tailing reservoir and its vicinity in Huludao molybdenum mine area were evaluated based on sampling, and on this basis, the research on the related soil improvement and phytoremediation were carried out. The results show that the soil heavy metal contamination of the areas under study is serious, with the tailings land contaminated mainly by Pb and Zn and its vicinity by Cd and Zn. The soil of the abandoned tailing reservoir is very lean and the arable land in the vicinity lacks nitrogen and phosphorus. It is found through test that the municipal sludge treated by composting can be used to improve the contaminated soil, and Festuca arundinaceaL. , Poa pratensisL. , Lolium perenneL as well as Hippophae rhamnoides L. can be used in the phytoremediation project as pioneer plant species.