IMPROVING BIOENERGY PRODUCTION FROM ANAEROBIC CO-DIGESTION OF PAPER WASTE AND CHICKEN MANURE USING COCONUT SHELL BIOCHAR. FJS [Internet]. 2024 Dec. 31 [cited 2025 Sep. 12];8(6):107-13. Available from: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/2869