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Lead (Pb) is one of the hazardous contaminants produced by the effluents from various industries, such as, tannery, battery storage, ore-smelter, electroplating etc. and municipal soild waste affecting adversely in the environment. Such industrial effluents when processed through common effluent treatment plants (CETP) generate metal precipitated sludge and other higher lead conjugated industrial solid wastes migrate considerable amounts of lead in soil and sub-surface water environment. So, there is being a big challenge to develop proper methodologies for remediation of such industrial pollution. In this context, better practicing with locally available clay soil as a lowcost sustainable barrier would be imperative below the landfills to increase further the retardation of the contaminant through engineering barriers. In the present study, a series of batch adsorption tests has been conducted with a moderately plastic (LL 41% and PI 17%) locally available silty clay soil (clay 26%, silt 74%) with low hydraulic conductivity (3.1 × 10–9 m/s). Batch study was carried out in the laboratory to examine its attenuation potential using Pb2+ spiked solution of 15 mg/L initial concentration. Experimental results demonstrated that after two hours of contact time nearly 67% equilibration adsorption (qe 125 mg/Kg) was attained for soil dosage of 80 g/L. From earlier studies, Indian sandy loam soil (clay 39.5%, fines content (< 75 micron) 56.7%, pH 7.65, CEC 30 meq/100 g, organic carbon 0.55%) had demonstrated that equilibrium removal 62% on equilibrium soil dosage 100 g/L and initial concentration 90 mg/L. Also, experimental data were found to well fit with pseudo second order kinetic model and Langmuir–Freundlich isotherm model. Thus, the soil examined in the present study may be used as a sustainable low-cost liner material in any type of lead (Pb) conjugated protective waste containment structures (e.g. as a landfill liner or for CETP sludge containment etc.) of higher service life with leaching concentration up to 15 mg/L.

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Assessment of Attenuation Potential of a Fine-Grained Indian Clay Soil for Lead (Pb2+) Removal with Performing Batch Study and Kinetic-Isotherm Modelling

  • 会议论文

  • 发表日期：

    2026年

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  • Gouranga Mondal,
  • Ramendu Bikas Sahu,
  • Somnath Mukherjee

摘要

Lead (Pb) is one of the hazardous contaminants produced by the effluents from various industries, such as, tannery, battery storage, ore-smelter, electroplating etc. and municipal soild waste affecting adversely in the environment. Such industrial effluents when processed through common effluent treatment plants (CETP) generate metal precipitated sludge and other higher lead conjugated industrial solid wastes migrate considerable amounts of lead in soil and sub-surface water environment. So, there is being a big challenge to develop proper methodologies for remediation of such industrial pollution. In this context, better practicing with locally available clay soil as a lowcost sustainable barrier would be imperative below the landfills to increase further the retardation of the contaminant through engineering barriers. In the present study, a series of batch adsorption tests has been conducted with a moderately plastic (LL 41% and PI 17%) locally available silty clay soil (clay 26%, silt 74%) with low hydraulic conductivity (3.1 × 10–9 m/s). Batch study was carried out in the laboratory to examine its attenuation potential using Pb2+ spiked solution of 15 mg/L initial concentration. Experimental results demonstrated that after two hours of contact time nearly 67% equilibration adsorption (qe 125 mg/Kg) was attained for soil dosage of 80 g/L. From earlier studies, Indian sandy loam soil (clay 39.5%, fines content (< 75 micron) 56.7%, pH 7.65, CEC 30 meq/100 g, organic carbon 0.55%) had demonstrated that equilibrium removal 62% on equilibrium soil dosage 100 g/L and initial concentration 90 mg/L. Also, experimental data were found to well fit with pseudo second order kinetic model and Langmuir–Freundlich isotherm model. Thus, the soil examined in the present study may be used as a sustainable low-cost liner material in any type of lead (Pb) conjugated protective waste containment structures (e.g. as a landfill liner or for CETP sludge containment etc.) of higher service life with leaching concentration up to 15 mg/L.