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CHEMICAL CHARACTERISATION OF PHOSPHATE INDUSTRY EFFLUENTS AND THEIR IMPACT ON QUALITY OF SEA WATER

Congress: 2008
Author(s): OUCHAH Lahoucine MANDI Laila; OUZZANI Naaila
OUCHAH étudiant chercheure inscrit en doctorat MANDI professeur de la faculté smlalia marrakech OUZZANI professeur de la faculté smlalia marrakech

Keyword(s): PHOSPHATES? DISSOULVED PHOSPHORUS
AbstractThe activity of transformation of phosphates constitutes the dominant industrial activity in Safi city and region. 3 phosphates industries are localised at 10 Km from Safi City and are extended on 135 ha . This industry transform 6,1 millions tonnes a year of natural phosphate to phosphoric acid and fertilisers. The liquid pollutants are composed essentially by phosphor - gyps, as product of acidic attack on phosphate rock (1,6 - to 1,7 tonne par Tonne of phosphoric acid). The phosphor-gypsy is mixed to sea water and discharged in the surrounding sea. The total volume discharged is around 920 000 M3/day. In addition to the phosphates, this effluent throws heavy metals and other pollutants. The aim of this work is to carry out investigations on the effluent of the phosphate industry in order to have a complete characterisation previous to any choice of treatment systems. Recent investigations done on the effluent of the Phosphates industry situated in Safi at 150km far from Marrakech City show that this effluent present an acidic PH, very high conductivity value and very high load of minerals such as Na ( 25,8-28.8) , Cl-( 19- 21,3 g/l) and Ca++ ( 0.8 -1.3 g/l). As the cooling and cleaning water used in this industry is principally originated from the sea, the main characteristics are very near from those of sea water. Even though the industry discharge high quantities of phosphor-gypsy, phosphate are principally under particulate forms . phosphates (PO4) exceed 30 to 421 mg P/l and total phosphorus 1.37 to 1.54 g P/l. The particulate forms of phosphates settled quickly in the surrounding area of the effluent discharge.
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