Capers as a natural coagulant: a sustainable approach to wastewater treatment and sludge valorization via vitrification. - Kouniba, Salma; Zourif, Ali; Aqdim, Sara; Boudad, Lahcen; Taibi, M.'Hamed; Bouari, Abdeslam El; EL Guendouzi, Mohamed (Environmental Science & Pollution Research, 2025)