Aims

HDS sediment is a type of solid waste produced when the high-concentration mud method (HDS) is adopted to treat acid wastewater from copper mines. It can rationally utilize sediment resources by using phytoremediation, which plays a role in the ecological restoration of mines.

Methods

To reveal the effect of different phytoremediation on the heavy metal, enrichment capacity and microbial diversity of the HDS sediments of copper mines, in this experiment, the HDS sediments of a copper mine without phytoremediation were selected as the control group, while the sediments of black locust (Robinia pseudoacacia), slash pine (Pinus elliottii Engelmann) and Chinese white poplar (Populus tomentosa Carr.) were used as test groups to analyze the physical and chemical properties, heavy metal pollution and bioaccumulation capacity of HDS sediments under three phytoremediation.

Results

The results show that different phytoremediation can reduce the sediment's conductivity and adjust the sediment’s pH value to the range suitable for plant growth. The BCF_Shoot and BTF values of Chinese white poplar to Cd and Zn and slash pine to Pb were both greater than 1.

Conclusions

As discovered from the bioconcentration coefficient and biotransport coefficient results, Chinese white poplar is a Cd-enriched and Zn-enriched plant, while slash pine is a Pb-enriched plant.

中文翻译：

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不同植物修复铜矿HDS沉积物重金属污染的实验研究

 目标

HDS沉积物是采用高浓度泥浆法（HDS）处理铜矿酸性废水时产生的一种固体废物。利用植物修复技术可以合理利用底泥资源，对矿山生态恢复起到一定的作用。

 方法

为了揭示不同植物修复对铜矿HDS沉积物重金属、富集能力和微生物多样性的影响，本实验选取未经植物修复的铜矿HDS沉积物作为对照组，黑色素沉积物作为对照组。以刺槐、湿地松和毛白杨为试验组，分析3种植物修复下HDS沉积物的理化性质、重金属污染和生物富集能力。

 结果

结果表明，不同的植物修复可以降低沉积物的电导率，将沉积物的pH值调整到适合植物生长的范围。白杨对Cd、Zn和湿地松对Pb的_BCF和BTF值均大于1。

 结论

从生物富集系数和生物传输系数结果发现，白杨是富镉、富锌植物，而湿地松是富铅植物。