Evaluation and biologic treatment of an urban effluent

The water consumption increases at high speed under the effect of the demographic growth and the agricultural and industrial development. This water consumption involves a significant and increasing quantity of wastewater. These untreated rejections generally are poured in receiving environment (lake, river, sea, etc.), causing harmful effects on the environment. This study aims to evaluate quantitatively and qualitatively urban water of the commune of Zeralda situated at the west (30 km) of Algiers. This water is rejected without treatment in the sea. This study has been to investigate in a first time to the parameters of pollution which influence the biological treatment of water. Among these parameters, we have determinate, pH, water–air temperature, MES, COD, BOD5, turbidity, conductivity, etc. The results of the analysis of physical and chemical parameters of pollution showed that their content exceed widely the standards of rejection [1–2]. In a second time, we have tested a biological treatment by language. This study is based on the analysis of organic matter and nutritive substances in the aqueous phase. The obtained results showed an important increase + 3 of the dissolved oxygen and 97, 94.5 and 79.2% for turbidity, NH4 and PO4 − respectively. After the obtained results this effluent can be treated, recycled and developed what constitutes an adequate solution to cure the problems of pollution, it will be able thus to safeguard the quality of the natural environment.

During this study we have tested a biologic treatment for an urban wastewater. The evaluation of the polluting load has lead to determinate the physical and chemical parameters which influence the biological treatment. The results of the analyses of the chemical parameters of pollution permitted us to note that these urban waters passed the permissible standards. The treatment applied to this effluent decreased the load of the pollution parameters extensively. The biologic treatment applied to these waters permitted to decrease the polluting load of which the retention of elimination of the pollution parameters reached 100% for the MES and 97% for the turbidity. The obtained results suggest us that the effluent is suitable to this type of treatment. This technique can be used and recommended in the urban wastewater treatment and exploited in the urban zones. The biologic treatment applied to this effluent can be used because of its composition is essentially organic and biodegradable. This process of treatment will be able to decrease the pollution thus, to protect the environment and to maintain the quality of the receiving environment (sea).