Nitrate removal from groundwater in Casablanca region (Morocco) by electrocoagulation
2020
Amarine, Mohammed | Lekhlif, Brahim | Mliji, El Mostafa | Echaabi, Jamal
In this work, the denitrification of nitrate-contaminated groundwater by electrocoagulation (EC) method using aluminum electrodes has been studied for the production of drinking water. Tests were carried out on four samples collected from the Casablanca-Settat region. EC was investigated for a fixed applied voltage (30 V), the submerged surface area of each electrode plate (33.75 cm²) and the inter-electrode distance (1.8 cm). The results obtained showed that the nitrate removal efficiency reached values between 88.48% and 94.1% after 120 min for the various studied groundwater samples. Also, these results showed that sulfates are removed equally with nitrates during electrocoagulation treatment and that their removal efficiencies ranged from 58.24% to 97.86% for all studied samples after 120 min depending on the initial chloride concentration. The bacterial charge has been completely eliminated by electrocoagulation for most of the bacteria present in the treated water. Finally, X-ray diffraction was used to characterize the sludge formed by aluminum electrodes during the EC process.
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