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Municipal solid waste (MSW) leachate contains high levels of heavy metals such as lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), zinc (Zn), manganese (Mn), arsenic (As), silver (Ag), and nickel (Ni). These heavy metal ions significantly threaten public health as they can infiltrate the aquifer beneath the landfill. Developing a landfill liner that can effectively prevent the transport of these heavy metals in solid waste landfills from MSW is crucial. The search for strongly adsorbing materials with high treatment efficiency continues for landfill liners. The study focuses on using Calcium Carbide Residue (CCR), an industrial byproduct of the acetylene industry, as a liner amendment with black cotton soil (BCS). Leachate was collected from a working landfill in Vilholi, MH, India. Different mixture ratios of CCR were prepared and analyzed to determine the optimum heavy metal retention efficiency. CCR was added sequentially in ratios of 2, 4, 6, and 8% to BCS mixed with leachate. The study found that the ideal concentration for heavy metal absorption was an 8% CCR ratio in BCS, which exhibited higher efficiency for removing Zn, Pb, Cu, and Cd. Batch testing showed that adsorption was pH dependent, with maximum adsorption occurring between pH 5 and 7. The absorption behavior was studied using ESEM and ICP-AES, and the results showed effectiveness of CCR in removal of heavy metals.

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Black Cotton Soil Amended with Calcium Carbide Residue as a Stabilizing Agent to Retain Heavy Metals

  • 会议论文

  • 发表日期：

    2025年

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  • Khushi Gill,
  • Mahesh Endait,
  • Swati Patil

摘要

Municipal solid waste (MSW) leachate contains high levels of heavy metals such as lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), zinc (Zn), manganese (Mn), arsenic (As), silver (Ag), and nickel (Ni). These heavy metal ions significantly threaten public health as they can infiltrate the aquifer beneath the landfill. Developing a landfill liner that can effectively prevent the transport of these heavy metals in solid waste landfills from MSW is crucial. The search for strongly adsorbing materials with high treatment efficiency continues for landfill liners. The study focuses on using Calcium Carbide Residue (CCR), an industrial byproduct of the acetylene industry, as a liner amendment with black cotton soil (BCS). Leachate was collected from a working landfill in Vilholi, MH, India. Different mixture ratios of CCR were prepared and analyzed to determine the optimum heavy metal retention efficiency. CCR was added sequentially in ratios of 2, 4, 6, and 8% to BCS mixed with leachate. The study found that the ideal concentration for heavy metal absorption was an 8% CCR ratio in BCS, which exhibited higher efficiency for removing Zn, Pb, Cu, and Cd. Batch testing showed that adsorption was pH dependent, with maximum adsorption occurring between pH 5 and 7. The absorption behavior was studied using ESEM and ICP-AES, and the results showed effectiveness of CCR in removal of heavy metals.