Arief Rahman, Mulyadi Abdul Wahid, and Sapriyadi. “COD REMOVAL PERFORMANCE USING COMBINATION OF SPENT COFFEE GROUNDS ACTIVATED CARBON AND RIVER SAND AS FILTRATION MEDIA IN TOFU INDUSTRIAL WASTEWATER”. Indonesian Journal of Environmental Sustainability 3, no. 1 (June 30, 2025): 26–31. Accessed July 6, 2025. https://journal.ar-raniry.ac.id/IJES/article/view/7663.