1 Laboratory of Water, Membrane and Biotechnologies of Environnement, Centre of Research and Water Technologies (CERTE) Technopark of Borj-Cedria Adress: BP 273; Soliman 8020; Tunisia Tel: +216 79412199 Fax: +216 79412802 GSM: +216 55641366.
2Georesources Laboratory Centre of Research and Water Technologies (CERTE) Technopark of Borj-Cedria Adress: BP 273; Soliman 8020
3Agency for the Protection and Development of the Coast 2, Rue Mohamed Rachid ridha Belvedere 1002 Tunis Tunisia.
Abstract – Nowadays, the problems of rejections constitute an increasingly important danger in the receiving medium. Indeed, water is increasingly affected by organic and mineral contamination and even by the micro-organisms of which some are pathogenic and thus dangerous for the ecosystem. In this context, this study aims to determine the physicochemical characterization (Chemical Oxygen Demand-COD, Total Suspended Solids-TSS, salinity and total nitrogen) and microbiological (mesophilic and thermophilic bacteria, bacteria sensitivity to antibiotics) of the sebkha Ben Ghayadha waters. The results showed COD of 4000 mgO2/L exceeding the limit fixed by the Tunisian standard TN 106.02 (1989) at 90 mgO2/L by the Environmental Protection for marine hydrological effluent discharge. However, all the TSS values were under 12 mg/L. Also, total nitrogen (TN) values ranged from 1.9 to 47.8 mg /L,rcorded at a depth of 2,3 and 4 meters, respectively. All the obtained results were consistent with TN 106.02 (1989). The bacteriological analysis based on faecal bacteria counts, showed that all the samples analyzed have loads of fecal bacteria lower than that fixed by TN 106.02 (1989). Bacteria isolated from the waters sebkha showed a high sensitivity to antibiotics suggesting a low virulence.