However the sludge agricultural valorization, which was the oldest mode and the more used for the treatment and valorization of sludge issued from wastewater treatment plant, may no longer meet the health and environmental requirements dictated by legislation (AMIR) [3]. The future of this outlet was seriously called in question whereas the sludge volume produced was brought to increase. This report implies the search for other alternatives making it possible to pack the range of the existing solutions.