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Physicochemical And Metal Water Quality And Sediments Moulouya And The Dam Hassan Ii Downstream Of The Abandoned Mine Zeida, High Moulouya (morocco).

Congress: 2015
Author(s):
AbstractThe lead-mining districts of Upper Moulouya in eastern Morocco, including the Zeida, Aouli Mibladen and mines, was one of the largest lead-deposit Morocco. Zeida mining center, as is the case for Aouli and Mibladen is abandoned since 1985 without rehabilitation or monitoring impact on the environment. To assess the impact of the abandoned mine Zeida environmental, physicochemical and metal water quality and sediments Moulouya and the dam Hassan II downstream of the abandoned mine Zeida were studied. Monitoring physicochemical parameters of surface water samples was realized. Of surface water samples and sediments were collected along the Oued Moulouya from the mine to the Hassan II dam downstream to fifteen kilometers. These samples were analyzed. The results show that the pH of surface water is neutral to slightly alkaline (7.2 to 8.7) in the different stations of the study area, the values of the measured conductivity showed a maximum 1456μs / cm recorded in the dry season the values of conductivity and Eh those recorded respectively a maximum of 1456 microseconds / cm and de173mv at stations located near the mine. Water infiltrated in the mining waste, rich in carbonate minerals, and located on both banks of the river Moulouya, are still average physico-chemical quality. These alkaline and loaded with suspended matter waters require treatment for drinking water production. Moreover, monitoring of metal pollution in the water filtered samples taken showed overall values concentration trace metals (ETM) very low. Moreover contents ETM Pb, Cu and As are very high in sediments from all stations near the mine and downstream maximum 11 200 ppm Pb is registered in the vicinity of verses tailings treatment. The levels are normal cutter for Zn. The trace metals contents in sediments of Moulouya at the mine Zeida far exceeding the normal levels of these elements in river sediments. The results of the study helped identify the source of contamination of water and sediment from the Dam and Moulouya Hassan II in Upper Moulouya it comes to mining source in particular tailings treatment abandoned without rehabilitation regarded as the main source of pollution in remarkably ETM for sediments, the latter constituting a significant reserve of pollutants. Keywords: water, sediments, mine tailings, metal trace elements, river Moulouya, Dam Hassan II mine Zeida, High Moulouya.
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