In order to preserve the environment, various treatment processes of wastewater discharges are used. Anaerobic digestion is part and allows among other things the production of sludge. The use of sewage sludge in semi arid, characterized by a binding climate, anthropozoogenic pressure and erosion, more increasingly important, is a solution for the restoration of degraded forest lands. In this study, the effect of an intake of composts from urban sewage sludge on soil quality has been studied in-situ soils degraded in semi arid area. The research followed in this work methodology is the first to evaluate the effectiveness of contribution of compost over time on the restoration of the physico-chemical quality of forest soils, then to evaluate the effectiveness of compost quality depending on the state of disturbance of the ecosystem to restore the chemical quality of these soils. Our results show a significant effect of sewage sludge on soil's physical and chemical characters that have been processed. This effect was delivered by the holding capacity increase, ammonium ions, inorganic phosphorus, total nitrogen, the carbon and the organic matter in these soils. This research is to show that sewage sludge are rich in easily mineralizable organic matter and are supposed to be the most suitable for the restoration of soil most impacted by the antropozoogene action. These contributions would quickly revitalize these soils by labile resource inputs.
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