In this study, pretreatment of banana pulp using eggshells in both calcined and un-calcined forms to examine the extent of hydrolysis was conducted. Reactor CO containing banana pulp and inoculum but with no eggshells added was used as the control, while reactors C1
, and C5
containing banana pulp and inoculum were spiked with 1, 3, 5, 7, and 9 g of un-calcined eggshells and calcined eggshells, for experiment 1 and 2, respectively. Anaerobic digestion was carried out at mesophilic temperature (35°C) for a period of 20 days. Digester C3
with 5 g of calcined eggshells gave the largest cumulative biogas yield of 2343 mL with 62% CH4
, follow. The least biogas yield of 10 mL was obtained in digester C5
with 9 g of calcined eggshells additive.
Key words: Anaerobic digestion, banana pulp hydrolysis biogas, eggshells.