Heavy metal uptake and leaching from polluted soil using permeable barrier in DTPA-assisted phytoextraction

Heavy metal uptake and leaching from polluted soil using permeable barrier in DTPA-assisted phytoextraction
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DTPA 辅助植物提取中使用渗透屏障从污染土壤中吸收和浸出重金属

DOI:
10.1007/s11356-014-3751-5
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发表时间:
2015-04
影响因子:
5.8
通讯作者:
Lian Duo
Lian Duo
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Shulan Zhao;Zhiping Shen;Lian Duo

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污水污泥在农业上的应用是处理这类废物的一种替代技术。但不合理施入SS会导致土壤中重金属的过量积累。通过土柱试验,研究了不同施用量(0、10、20 mg/kg−-1土)下SS处理土壤中黑麦草对重金属的有效性。为了防止DTPA辅助植物提取过程中金属的淋失,在处理土壤下设置了水平渗透屏障,并对其效果进行了评估。结果表明,DTPA的添加显著增加了土壤对金属的吸收。常年故障排除和金属浸出。可渗透屏障增加了植物地上部的金属浓度,并有效地减少了处理土壤中金属的淋失。SS处理土壤中的重金属可以通过收割逐渐被去除。一年中常年多次使用,每次收获前几天添加低剂量的DTPA。
Application of sewage sludge (SS) in agriculture is an alternative technique of disposing this waste. But unreasonable application of SS leads to excessive accumulation of heavy metals in soils. A column experiment was conducted to test the availability of heavy metals toLolium perennegrown in SS-treated soils following diethylene triamine penta acetic acid (DTPA) application at rates of 0, 10 and 20 mmol kg−1soil. In order to prevent metal leaching in DTPA-assisted phytoextraction process, a horizontal permeable barrier was placed below the treated soil, and its effectiveness was also assessed. Results showed that DTPA addition significantly increased metal uptake byL. perenneshoots and metal leaching. Permeable barriers increased metal concentrations in plant shoots and effectively decreased metal leaching from the treated soil. Heavy metals in SS-treated soils could be gradually removed by harvestingL. perennemany times in 1 year and adding low dosage of DTPA days before each harvest.
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