Riduan, Ahmad, Rainiyati Rainiyati, Sarah Fiebrina Heraningsih, and Badariah Badariah. 2022. “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 (1). Malang, Indonesia:3981-89. https://doi.org/10.15243/jdmlm.2022.101.3981.