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Advances in Environmental Research Volume 13, Number 1, March 2024 , pages 25-50 DOI: https://doi.org/10.12989/aer.2024.13.1.025 |
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Exploring the efficacy of nanoclay additives in mitigating leachate migration through the liner layers of Tabriz landfill |
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Mahdi Nikbakht, Fariba Behrooz Sarand,
Rouzbeh Dabiri and Masoud Hajialilue Bonab
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| Abstract | ||
| Landfills and the associated leachate present significant threats to both biological ecosystems and environmental resources, with uncontrolled leachate pollution posing the potential for severe environmental and human disasters. To address this concern, the use of liners has emerged as a crucial strategy for managing landfill leachate. This study focuses on assessing the effectiveness of integrating nanoclay additives, specifically Montmorillonite, in reducing the permeability of landfill liner layers. A comprehensive set of geotechnical tests, including sieve analysis, hydrometry, Atterberg limits, permeability, and chemical assessments (BOD and COD), was conducted on samples extracted from the core of the Tabriz landfill liner. The samples underwent testing within control groups and varying percentages of additives (3%, 6%, and 9%) over processing durations of 1, 7, and 14 days. A comparative analysis of the results was then performed. The findings indicate that increasing nanoclay percentages led to significant improvements in Atterberg limits (LL, PL, and PI), showing increments of 48%, 33%, and 45%, respectively. Furthermore, the permeability coefficient in the control sample exhibited a substantial decrease of 98% compared to the sample enhanced with 9% nanoclay. Additionally, the addition of nanoclay facilitated the absorption of Pb and As while reducing Bod and Cod in the soil.Collectively, these results underscore the effective role of nanoclay, particularly Montmorillonite, in enhancing the landfill liner system's ability to manage leachate. The implications of this study highlight the considerable potential of nanoclay additives as instrumental agents in addressing leachate-related concerns in landfill environments. | ||
| Key Words | ||
| geotechnics landfill; leachate; nanotechnology; soil permeability | ||
| Address | ||
| Mahdi Nikbakht, Fariba Behrooz Sarand and Rouzbeh Dabiri: Department of Civil Engineering, Islamic Azad University, Tabriz Branch, Tabriz 5157944533, Iran Masoud Hajialilue Bonab: Department of Civil Engineering, University of Tabriz, Tabriz5166616471, Iran | ||
