It is imperative for Algeria by virtue of its arid to semiarid climate to rationalizing the use of conventional water resources. That is why the agricultural reuse of byproducts is an alternative treatment expected to preserve the water resources, the environment and the promotion of the agricultural sector. The present work aims to search for the possibility of reusing treated wastewater and sludge resulting from the treatment plant of the city of Médéa in agriculture, through the analysis of physical, chemical and bacteriological on the samples, and the continuous monitoring of the evolution of several elements. The results showed that the treated water, despite its high salinity, can be reused for irrigation of some salt-tolerant species and on well-drained soil and leached. The sewage sludge, by the relatively low amount of organic matter it contains, is considered a fertilizer, more than organic amendment.

The sanitation system in Algeria requires a mastery of the functioning of the collection network and treatment using performance indicators that identify gaps and to develop solutions for better waste-water management. This work aims to identify the performance indicators that are chosen on the basis of the problems often encountered. The referred performances concern the problems related to clear parasites waters and some that highlight the phenomena of sedimentation-erosion in the net-work of Medea city. For the WWTP, we are interested in the plant hydraulic and treatment capacity, the bacterial metabolism, the treatment yield, the correlations between pollution parameters and the energy consumption. The results showed that the dilution rate of wastewater, which is caused by the clear parasites waters, requires significant care at the sewerage network. The imbalance into nutrients relating to bacterial metabolism can be an obstacle at the level of biological treatment. For high ratios TSS/COD and TSS/BOD 5 that translate a pollution at particulate character, a quantitative study would be required in particular to evaluate the influence of collection networks on the quality of domestic sewage. The high values of the electrical energy necessary for the elimination of recorded pollution require to perform a diagnostic analysis on the installation.

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