Riduan, Ahmad, Rainiyati Rainiyati, Sarah Fiebrina Heraningsih, and Badariah Badariah. “Minimizing River Pollution by Batik Dye Wastewater Using Palm Oil Fuel Ash (POFA) As an Environmentally Friendly, Low-Cost Adsorbent Alternative”. Journal of Degraded and Mining Lands Management 10, no. 1 (October 1, 2022): 3981–3989. Accessed July 17, 2024. https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/1319.