Effect of Weathered Coal on the Leaching Behavior of Lead-Contaminated Soil with Simulated Acid Rain

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• 作者：Jiahao Liu ; Hua Li ; Ruiping Wu ; Yuen Zhu ; Weiyu Shi
• 关键词：Weathered coal ; Solid waste ; Pb ; Acid rain ; Soil pollution
• 刊名：Water, Air, and Soil Pollution
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：227
• 期：10
• 全文大小：672 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Terrestrial Pollution
  Hydrogeology
  
• 出版者：Springer Netherlands
• ISSN：1573-2932
• 卷排序：227

文摘

Lead (Pb) has progressively become a widespread contaminant in the environment because of its intensive use and inherent stability. The contamination of Pb in agricultural soils is a major environmental problem. This paper considers the use of weathered coal humic acids for in situ remediation of Pb-contaminated soils. The effectiveness of acid rain on leaching in soil column was investigated. To determine the mobility and availability of Pb, we also investigated the soil pH and available soil Pb content from different depths in addition to the leachate pH and Pb concentrations at different times. Weathered coal has the potential to adjust the soil pH and leachate pH through metal-bridging mechanisms and deprotonation processes. We found that weathered coal humic acid and simulated acid rain significantly decreased the available surface soil Pb concentrations. The decrease in the available Pb concentrations in the surface layers of the soil was related to a significant increase in the available Pb concentrations in the middle layers of the soil. The application of weathered coal humic acid could reduce the Pb concentration of soil leachates. The removal of Pb was efficient, particularly at the 1000-mg-kg−1 Pb pollution level, with a maximum decrease of 85.8 %.