城市剩余污泥改良铁尾矿砂过程中重金属含量的变化研究

Study on Change of Heavy Metal Content in Process of Improving Iron Tailings Using Municipal Sludge

为了探索城市污泥对铁尾矿砂的改良作用,本文将铁尾矿砂与城市污泥按不同的比例混合,作为改良基质用于盆栽植物,分析改良土壤中的重金属Pb、Cu、Cd、Cr的总量和形态的变化。结果表明,城市污泥对铁尾矿砂具有一定的改良作用,当铁尾矿砂与城市污泥的质量比为7∶3时,供试植物小白菜的生长情况良好。4种金属的总量随着植物生长时间的增加而降低,其中Cr总量变化最大,Cd总量变化最小。该结果可为剩余污泥安全应用于铁尾矿的生态修复提供理论依据。

In this experiment, iron ore tail and municipal sludge were mixed in different proportions as improved substrates for Chinese cabbage, the total amount and morphological changes of Pb, Cu, Cd, Cr in the soil were analyzed. The results showed that the municipal sludge has a certain improvement effect on the iron tailing sand. When the mass ratio of iron tailings to municipal sludge was 7:3, the growth of Chinese cabbage was good. The total amount of 4 kinds of metals decreased with the increase of plant growth time, among which the total amount of Cr was the largest and the total Cd was the least.