Syaichurrozi, Iqbal, et al. “Effect of Alum Dose in the Coagulation Process for Decreasing the Pollutant in the Palm Oil Mill Effluent: Experimental and Kinetic Analysis”. Eksergi, vol. 19, no. 3, Nov. 2022, pp. 91-96, doi:10.31315/e.v19i3.7405.