Contribution à l’étude du réseau de distribution de l’eau potable : Cas de la ville de Ghardaia

Abstract

This work concerns the bacteriological quality of the water of distribution of the region of Ghardaia city. This study is made for purpose of the surveillance and the conservation of the bacteriological quality of the water since the feed of station of municipality of Ghardaia up to various points of distribution network. For every sample, we were interested in the analysis of the residual chlorine and in the search and in the enumeration of the total and faecal coliformes, feacal Streptococci, and especially the resistance of bacteria in the disinfectant (chlorine). Samples were taken in 2 districts, 3 points in every one, and a sample of feed before chlorination. Analyses showed the presence of some species of bacteria in the water which resisted the concentration of the chlorine lower than 1 mg/l: the enterobacter cloacae, Citrobacter criticizes, Provencia stratum, who can cause infections, but the concentration of the latter is low. Thus according to the standards of the WHO the water is drinkable, and ready to be consumed.