浸出(土壤学)
修正案
环境化学
土壤水分
环境修复
化学
壤土
土壤污染
环境科学
堆浸法
污染
环境工程
土壤科学
尾矿
生态学
生物
政治学
法学
物理化学
作者
Pengjie Hu,Yang Bingfan,Changxun Dong,Like Chen,Xueying Cao,Jie Zhao,Longhua Wu,Yongming Luo,Peter Christie
出处
期刊:Chemosphere
[Elsevier]
日期:2014-09-29
卷期号:117: 532-537
被引量:84
标识
DOI:10.1016/j.chemosphere.2014.08.081
摘要
The efficiency of heavy metal removal from soil by EDTA leaching was assessed in a column leaching experiment at the laboratory scale and field heap leaching at the pilot scale using a sandy loam sierozem agricultural soil contaminated with Cd, Cu, Pb, and Zn. Soil amendment and aging were conducted to recover leaching soils. The percentages of Cd, Cu, Pb, and Zn removed by column leaching were 90%, 88%, 90%, and 67%, respectively, when 3.9 bed volumes of 50mM EDTA were used. At the pilot scale, on-site metal removal efficiencies using the selected leaching procedure were 80%, 69%, 73% and 62% for Cd, Cu, Pb and Zn, respectively. EDTA leaching decreased soil CEC, total P, total K and available K concentrations but increased organic matter and total Kjeldahl N concentrations. The subsequent amendment and soil aging further reduced the DTPA-extractable heavy metals in the leached soils. Growth of the first crop of pak choi in the leached soil was inhibited but the second crop grew well after the soil was aged for one year and the concentrations of Cd and Pb in the edible parts were below the Chinese statutory limits. The results demonstrate the potential feasibility of the field leaching technique using EDTA combined with subsequent amendment and soil aging for the remediation of heavy metal-contaminated agricultural soils.
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