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Journal of Geotechnical Engineering Original Research

Assessment of Clayey Soils and Bentonite to Use as Compacted Clay Liner for the Disposal of Municipal Solid Wastes at Lucknow City, India

  1. Kamal Nabh Tripathi
  2. Surendra Roy

Abstract

Dumping of municipal solid wastes in a pit without liner causes groundwater contamination. Use of locally available clayey soils will be a cost-effective landfill technique. Mixing of locally available soils with bentonite reduces the permeability. To develop the liner for the disposal of municipal solid wastes generated from Lucknow city, India, the soil samples were collected from three different locations as nearby the Sagar Institute, Barabanki district; near railway crossing, Bakshi Ka Talab, Lucknow district and from Gosaiganj, Lucknow district. Different geotechnical properties such as specific gravity, particle size, liquid limit, plastic limit, plasticity index, compaction characteristics, free swell ratio and permeability of all the three soil samples were analyzed to check their suitability as a liner material. These parameters were also determined for bentonite except free swell ratio. Free swell ratio of the Gosaiganj soil sample was found under high category of expansivity. The soil of this location has the highest specific gravity, plasticity index and free swell ratio. But no any soil met the criteria of permeability to be used as a liner material. Based on the geotechnical properties, the soil of Gosaiganj was selected to use as a liner material. To meet the criteria of permeability and others, this soil was mixed with bentonite in different proportions. Bentonite was mixed in the proportion of 0%, 10%, 20%, 30% and 40% with a soil and assessed for maximum dry density, optimum water content, permeability and free swell ratio. Bentonite at 40% with a soil met the required criteria of permeability and have the highest free swell ratio. Based on the present municipal solid waste generation in Lucknow city, the size of landfill has been designed. The amount of soil and bentonite required for the construction of liner for the landfill site has also been determined in this paper

Keywords

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