Biological treatment of an urban sewage and analyses of sediments

In the aim to preserve the environment, different processes treatment of the residuary waters are possible and necessary. The present work is a contribution to the preservation of the environment, industrial and urban wastewaters. Indeed the majority of the urban regions had not station of purification and their residuary waters are directly poured in sea and rivers. To mitigate this problem rejected water can be treated and could thereafter be valorised and used in different domains. We are interested a first time to analyze an urban effluent which is directly poured in the sea. The takings away were carried out on site and analyzes chemical and physical parameters such as: the temperature, turbidity, conductivity, the pH and oxygen dissolved were carried out in situ. The M.E.S and the M.V.S, the B.O.D, the C.O.D, the nitrates and the ortho phosphates were analyzed in the laboratory [1]. The results of the analyses showed that the content of the physical and chemical parameters of pollution widely exceeded the standards of rejection. We applied to this effluent a biological treatment. We analyzed organic matter and nutritive substances in the aqueous phase and the phase sediments. The assessment of sedimentation, variation of the MS and the height of the sediments, the %H and the qualitative evaluation of the deposits such as Fe, Cu, Zn, Mn, Pb, Cd [2]. This work has been done several seasons in order to see the climatologic effect on the treatment. According to the results obtained this effluent can be treated and developed what constitutes an adequate solution to improve quality of the receiving environment and to cure the problems of pollution