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Review of Groundwater Nitrate Pollution from Municipal Landfill Leachates: Implications for Environmental and Human Health and Leachate Treatment Technologies

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Abstract

Inadequate management of solid waste stands out as a primary cause of environmental contamination, leading to a decline in groundwater quality in the vicinity of landfill sites. Though landfills are required by federal regulation to have liners formed by plastic or clayey layers, these liners tend to have leaks, which can result in landfill leachate percolation into the soil and aquifers, contaminating nearby water sources and further damaging ecosystems. Currently, the elevated nitrate (NO3) concentration in groundwater spurred by landfill leachates is becoming a growing global concern. Various regions across the world present groundwater NO3 concentrations exceeding the threshold limit (50 mg/L) of WHO for drinking purpose. In this scenario, it is requisite to consider and develop highly efficient and affordable solutions for the long-term management of groundwater resources. Therefore, a bibliographical review was conducted in this paper by searching literature in Web of Science, ScienceDirect, Google Scholar, SpringerLink, PubMed, and Scopus to analyze NO3 pollution in groundwater caused by landfill leachates and explore the impacts of landfills and NO3 pollution on the environment and human health. In addition, this review also presents an overview of the leachate treatment technologies to remove nitrogenous compounds, particularly NO3. This review entails a worldwide appraisal of groundwater NO3 pollution to comprehend the human health risks and aid in optimizing groundwater quality. A resulting framework developed in this review provides an improved grasp of the link between inadequate landfill management and adverse environmental and health outcomes and urged all stakeholders to address the issue of solid waste to ensure environmental and human health. Overall, the results emphasize the need for immediate action and collaborative efforts to mitigate these impacts and ensure the long-term sustainability of waste management practices.

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(Source: Published literature from ScienceDirect from the year 2004 to 2023)

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Data Availability

Data for this review were compiled from multiple sources, including studies published in national and international journals and reports published by the government and non-government institutions spanning the period from 2004 to 2023.

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Acknowledgements

The authors thank the constructive comments from the editors and anonymous reviewers.

Funding

Financial support has been received from the National Natural Science Foundation of China (42072286 and 41761144059), the National Key Research and Development Program of China (2023YFC3706901) and the Qinchuangyuan “Scientist + Engineer” Team Development Program of the Shaanxi Provincial Department of Science and Technology (2022KXJ-005).

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Contributions

Misbah Fida contributed to data collection, data analysis, and original draft preparation. Peiyue Li contributed to detail review, supervision, data analysis, and revisions. S.M, Khorshed Alam, Yuanhang Wang, Abel Nsabimana, and Pratap Sundar Shrestha contributed to reviewing and editing of the manuscript.

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Correspondence to Peiyue Li.

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The authors have not declared any conflicts of interest.

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Fida, M., Li, P., Alam, S.M.K. et al. Review of Groundwater Nitrate Pollution from Municipal Landfill Leachates: Implications for Environmental and Human Health and Leachate Treatment Technologies. Expo Health (2024). https://doi.org/10.1007/s12403-023-00624-2

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  • DOI: https://doi.org/10.1007/s12403-023-00624-2

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