Résumé:
This work aimed to analyze the physical and chemical parameters of the seawater under the
influence of wastewater discharges coming from the wastewater treatment plant located near
the Crique of Salamandre, on the one hand, and wastewater discharges in the beach of Stidia,
on the other hand. The measurements were carried out using a portable multi-parameter probe
and allowed to give an opinion on the quality of the sampled seawater by comparing it with
reference seawater. Of the four sites chosen for sampling, only two were selected (Stidia
beach and Crique of Salamandre) since other targeted beaches were closed due to the sanitary
situation (Covid-19). Stidia beach was used as a reference site due to the fact that the spills
were low in this location. Water samples were taken during the months of March and July
2020. Five physical and chemical parameters were analyzed, namely temperature and
dissolved oxygen, measured in situ, salinity, conductivity and hydrogen potential which have
been determined in the laboratory. The results of the study show that the seawater sampled at
the Crique of Salamandre is affected by daily discharges from the wastewater treatment plant
(STEP), whose treatment seems to be insufficient. In a concern for the protection of the
Crique of Salamandre and the ecosystems established in it, the STEP of Mostaganem should
improve its treatment efficiency.
