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Open AccessFeature PaperArticle

Landfill Pollution Plume Survey in the Moroccan Tadla Using Spontaneous Potential

1
Laboratory Mediterranean Environment and Agro-Hydrosystem Modelling (UMR 1114 EMMAH), Hydrogeology Department, Avignon University, 84000 Avignon, France
2
Laboratory in Applied and Marine Geosciences, Geotechnics and Georisk (LR3G) Faculty of Science Tetouan, Abdelmalek Essaâdi University, 93002 Tetouan, Morocco
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National Research Institute of Agricultural Research (INRA), CRRAR, URECRN, 1000 Rabat, Morocco
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Laboratory of Geoscience, Water and Environment, (LG2E-CERNE2D), Department of Earth Sciences, Faculty of Sciences, Mohammed V University of Rabat, 1014 RP Rabat, Morocco
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Yakirevich
Water 2021, 13(7), 910; https://doi.org/10.3390/w13070910
Received: 14 February 2021 / Revised: 8 March 2021 / Accepted: 12 March 2021 / Published: 26 March 2021
(This article belongs to the Special Issue Modeling and Prediction of Groundwater Contaminant Plumes)
In many parts of the world, the impact of open landfills on soils, biosphere, and groundwater has become a major concern. These landfills frequently generate pollution plumes, the contours of which can be delineated by non-intrusive geophysical measurements, but in arid environments, the high soils resistivity is usually an obstacle, which results in the low number of studies that have been carried out there. In addition, such prospecting using geophysical techniques do not provide information on the intensity of the processes occurring in the water table. This study was carried out on an uncontrolled landfill in the arid Tadla plain, Morocco’s main agricultural region. A survey based on geo-referenced spontaneous potential measurements was combined with measurements of anoxic conditions (Eh-pH and O2 equilibrating partial pressure) in the groundwater and leachates, in order to highlight a pollution plume and its geometry. The range of spontaneous potential measurement is wide, reaching 155 mV. Ponds of leachate with high electrical conductivity (20 to 40 mS cm−1) form within the landfill, and present very reducing conditions down to sulphate reduction and methanisation. The plume is slowly but continuously supplied with these highly reducing and organic carbon-rich leachates from the landfill. Its direction is towards N-NW, stable throughout the season, and consistent with local knowledge of groundwater flow. The fast flow of the water table suggests pollution over long distances that should be monitored in the future. The results obtained are spatially contrasting and stable, and show that such techniques can be used on a resistive medium of arid environments. View Full-Text
Keywords: self-potential; redox potential; leachate plume; landfill; Tadla; Morocco self-potential; redox potential; leachate plume; landfill; Tadla; Morocco
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MDPI and ACS Style

El Mouine, Y.; El Hamdi, A.; Morarech, M.; Kacimi, I.; Touzani, M.; Mohsine, I.; Tiouiouine, A.; Ouardi, J.; Zouahri, A.; Yachou, H.; Dakak, H. Landfill Pollution Plume Survey in the Moroccan Tadla Using Spontaneous Potential. Water 2021, 13, 910. https://doi.org/10.3390/w13070910

AMA Style

El Mouine Y, El Hamdi A, Morarech M, Kacimi I, Touzani M, Mohsine I, Tiouiouine A, Ouardi J, Zouahri A, Yachou H, Dakak H. Landfill Pollution Plume Survey in the Moroccan Tadla Using Spontaneous Potential. Water. 2021; 13(7):910. https://doi.org/10.3390/w13070910

Chicago/Turabian Style

El Mouine, Yousra; El Hamdi, Amal; Morarech, Moad; Kacimi, Ilias; Touzani, Meryem; Mohsine, Ismail; Tiouiouine, Abdessamad; Ouardi, Jamila; Zouahri, Abdelmajid; Yachou, Hasna; Dakak, Houria. 2021. "Landfill Pollution Plume Survey in the Moroccan Tadla Using Spontaneous Potential" Water 13, no. 7: 910. https://doi.org/10.3390/w13070910

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