Résumé:
The water of the Bouhamden Dam is one of the most valuable resources for
drinking water and irrigation in the Guelma region. However, the quality of these
resources is constantly deteriorating in view of the numerous sources of pollution,
which is why it is important to treat and control the quality of this water.
Our study consisted in assessing the effectiveness of chlorination disinfection by
determining the physico-chemical and microbiological characteristics in a first step,
then the break point in a second step, to determine the optimal dose of chlorine required
for disinfection of these waters.
The disinfection tests carried out with sodium hypochlorite (NaClO) have shown
that these waters are very consuming of chlorine, because of their strong composition in
organic and mineral matter. Residual chlorine was completely absent in raw water.
After treatment, the obtained values are: 0.085 mg/l and 0.1 mg/l for the contact times
T1=60 min and T2=120 min respectively.
The determination of total and faecal coliforms revealed a total absence of
pathogenic germs.
The results obtained after the various tests conform to the national standards and
those recommended by the WHO.
Finally, we can say that the water of the Bouhamden Dam after chlorine
treatment meets the standards of potability required by the Algerian and international
standard according to the WHO is therefore of good quality on the physicochemical and
microbiological level.
All the results clearly demonstrate that the chlorination of surfaces water process
can be used as an effective tool in the elimination of pathogenic microorganisms.
