Improvement of the soil clay at the liner of the landfill to reduce cracking using fiber and nano chemical materials

Authors

1 PHD Student, Faculty of Civil Engineering, Semnan University, Semnan, Iran

2 Assoc. Prof.

3 Department of Chemical Engineering, Laboratory of Nanotechnology, Quchan University of Technology, Iran

10.22034/ceej.2023.57284.2275

Abstract

Increasing waste production due to population growth, improper waste disposal in landfills and spread of pollution caused is one of the most important environmental problems in urban areas. By special layers and coatings in the body and bottom liner, the penetration of toxic and dangerous leachate of waste into the surroundings is prevented. The cracks in the bottom layers of the landfill and expansion over time increases the permeability of the liner and accelerates the entry of the leachate of waste into the soil and groundwater. Hence, it is very important to adopt appropriate measures to prevent the creation of a network of cracks and the expansion in the liner of the landfill.In this study, focusing on the properties of Mashhad landfill and using laboratory methods, it has been attempted to improve the liners by adding polypropylene composite materials, micro-silica and nano silica. The soil clay type 1 is related to the soil around 9 km from the main landfill of Mashhad, which is used as a clay depot for the Mashhad landfill. The soil clay type 2 is related to the soil of the main landfill of Mashhad. The soil clay type 3 as the selected soil is a combination of Montmorillonite (MMT) and kaolinite at a weight ratio of 3:1, respectively.

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