Siregar , Hari Ananda Syahputra, and Rafael remit Winardi. “Effectiveness of Acid-Activated Oil Palm Fiber and Quartz Sand Adsorbents in Reducing Wastewater Pollutant Parameters”. RESWARA: Jurnal Riset Ilmu Teknik 4, no. 3 (July 17, 2026): 420–433. Accessed October 22, 2026. https://journal.kalibra.or.id/index.php/reswara/article/view/662.