Catalysing water treatments: A Comprehensive Examination of sludge, its treatment and Energy Valorisation SolutionsZakaria Boularbah, Wafae El Khoumsi, Rqia Bourziza and Youness El FellahE3S Web Conf., 502 (2024) 04006DOI: https://doi.org/10.1051/e3sconf/202450204006