DEFLUORURATION DES EAUX SOUTERRAINES DU SUD ALGERIEN PAR LA CHAUX ET LE SULFATE D'ALUMINIUM

Abstract

In the south of Algeria, according to some epidemiological investigations, a problem of health known under the name of endemic fluorosis puts extensively in the oriental zone. It emanates essentially of the ingestion of the excessive quantities of fluoride by the slant of the drinking water. Face to the rarefaction of the resources in alimentary waters of good quality, the treatment of the waters with a great content of fluoride will becomes a necessity of more in addition. In this objective, our choice is carried on the chemical precipitation by lime and the coagulation-flocculation by aluminium sulphate in reason of their efficiency and of the simplicity of their stake in work. This work was achieved on the water of four wells of the south of Algeria. The experimentation aimed to define the quantities of lime and aluminium sulphate to put in work in function of the vestigial content of the water in fluoride, then to control the quality of the water treated by the two products. Finally, a comparison between the results obtained by the two processes allowed us to conclude that the defluoridation by chemical precipitation by lime is the process of choice for many waters of northern Sahara.