Impact of margins on groundwater quality in the province of Taza, Morocco
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Abstract An extensive examination of water derived from six groundwater wells within the Oued Amlil region, Taza province, reveals a profound influence on groundwater quality due to the adjacency of five expansive contemporary olive-pressing mills. Moreover, the presence of retention and evaporation basins for margines serves as a localized source of potential pollution, significantly impacting the quality of the groundwater. The comprehensive analysis underscores heightened levels of specific elements: Polyphenols (3.2 mg/L), electrical conductivity EC (6.8 mS/cm), chemical oxygen demand CDO (96.00 mg O2/L), chlorides ????????−(95 mg/L), potassium ???? +(99 mg/L), and sodium ????????+(55 mg/L), indicative of margines-induced pollution. To delve into the hydrogeochemical mechanisms underlying groundwater pollution, Principal Component Analysis (PCA) was employed on the physicochemical data of the water samples. This sophisticated statistical methodology unveils significant associations between the pollution levels of the wells, predominantly attributed to margines, and their spatial proximity to the neighboring extensive oil mills. Notably, the outcomes of the physicochemical analyses exhibit discernible increments in pollutant chemical elements downstream of oil mills H1, H2, H3, H4, and H5, highlighting direct wastewater discharge from these industrial facilities into the environment. This aligns with the polyphenol measurements at the S1 control station in the Innaouene River, a tributary of the Oued Amlil aquifer. Furthermore, it becomes evident that pollution levels vary across wells, contingent upon individual well positioning and distance from the pollution source's current draining line.

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