IMPROVING BIOENERGY PRODUCTION FROM ANAEROBIC CO-DIGESTION OF PAPER WASTE AND CHICKEN MANURE USING COCONUT SHELL BIOCHAR - Ofon, Utibe A.; Ndubuisi-Nnaji, U. U.; Udofia, G. E.; Fatunla, O. K.; Shaibu, S. E. (FUDMA JOURNAL OF SCIENCES, 2024)