Arnesya Ramadhani, Sonya Hakim Raharjo and Retno Dwi Nyamiati 2023. Utilization of Fly Ash and Zeolite to Reduce Chemical Oxygen Demand (COD) in Domestic Waste at the Al Ihya Ulumaddin Islamic Boarding School Cilacap. Formosa Journal of Applied Sciences. 2, 3 (Mar. 2023), 303–312. DOI:https://doi.org/10.55927/fjas.v2i3.3347.