prasetyo joni. Preliminary Study on pH Optimization of Biogas Production Using POME, Palm Oil Mill Effluent. J. ilm. Teknik. Kimia [Internet]. 2021 Jan. 25 [cited 2024 Dec. 22];5(1):46-51. Available from: https://openjournal.unpam.ac.id/index.php/JITK/article/view/7453