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Evaluating the potential of treated municipal wastewater reuse in irrigation and groundwater recharge; 5-year contaminant transport modeling

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Abstract

The use of treated municipal wastewater in agricultural irrigation has become commonplace throughout the world for many years. So far, numerous research has been accomplished on the harms and benefits behind this work. This study was carried out in two parts to investigate the following issues: First, calculating 14 irrigation indices to ensure the appropriateness of using treated municipal wastewater in agricultural land irrigation, and second, conducting soil column experiments along with numerical modeling to predict contaminant transport in soil using HYDRUS-1D software and to investigate the possibility of using treated municipal wastewater in irrigation without harming groundwater resources. The results revealed that although most indices display the suitability of Wastewater for irrigation, some show the opposite. Accordingly, four indices of Magnesium Hazard (mean = 53.3%), Kelly’s Ratio (mean = 1.06 \(\mathrm{meq}/\mathrm{L}\)), Corrosivity Ratio (mean = 2.3), and Total Hardness (mean = 245.8 \(\mathrm{mg}/\mathrm{L}\)) are higher than the allowable limit of irrigation standards. Hence, wastewater reuse can cause problems concerning the physicochemical and microbial properties of soil as well as crop production. Finally, hydraulic conductivity (\(K\)= 252.73 \(\mathrm{cm}/\mathrm{day}\)), porosity (\(\Phi \) = 38%), saturated soil water content (\({\theta }_{s}\) = 0.27), bulk density (\({\rho }_{b}\) = 1.81 \(g/{\mathrm{cm}}^{3}\)), and longitudinal dispersivity (\({D}_{l}\) = 14.81 \(\mathrm{m}\)) were given as input data to the model. The transport modeling determined that heavy metals’ mobility in the soil is as follows \(\mathrm{Ti}>\mathrm{Mn}>\mathrm{Al}>\mathrm{Sb}>\mathrm{Sn}>\mathrm{Fe}=\mathrm{V}>\mathrm{Zr}>\mathrm{Co}\). Thus, \(\mathrm{Ti}\) and \(\mathrm{Co}\) have the highest and lowest mobility, respectively. As a result, it can be said that \(\mathrm{Ti}\) has the highest possibility of leaching and contaminating groundwater in the long run due to its high mobility.

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The authors did not receive support from any organization for the submitted work.

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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by NA and MN. The first draft of the manuscript was written by NA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to N. Amiri.

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The authors have no relevant financial or non-financial interests to disclose.

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All authors made substantial contributions to the conception, design, data interpretation, and all the steps involved in this work.

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Editorial responsibility: Q. Aguilar-Virgen.

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Amiri, N., Nakhaei, M. Evaluating the potential of treated municipal wastewater reuse in irrigation and groundwater recharge; 5-year contaminant transport modeling. Int. J. Environ. Sci. Technol. 21, 577–602 (2024). https://doi.org/10.1007/s13762-023-05293-x

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  • DOI: https://doi.org/10.1007/s13762-023-05293-x

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