INFLUENCE DE L'ENVIRONNEMENT SUR LA QUALITE DES EAUX DOMESTIQUES DE QUELQUES LOCALITES DE LA CUVETTE DE OUARGLA (SAHARA SEPTENTRIONAL EST ALGERIEN)

Abstract

The maintenance of the quality of drinking water from the exit of the treatment plant to the consumer's tap is a major concern of those responsible for the distribution of drinking water. The quality of domestic water of some points of domestic water in the basin of Ouargla, are studied over four campaigns spread over the months of February, March, April and May 2011. It appears that the free residual chlorine ranging from 0.1 mg/l to 0.6 mg/l, is sometimes not consistent with the standards following the campaigns, especially the 3rd. The pH values are neutral or slightly basic. The temperature of the spring water is between 25°C and 26.7°C, in the distribution network, it varies according to climatic variations. It ranges from 16.4°C in winter to 28.7°C in spring. The biochemical parameters which are considered as indicators of microbiological pollution, show a presence of ammonium exceeding the Algerian standards at some points. The hygienic characteristics of the water samples studied, reveal the existence of total germs at 22°C and 37°C in the distribution network. But, it is to be noted the absence of total and faecal coliforms, faecal streptococci and Clostridium sulphito-reducers