Anaerobic Co-Digestion of Palm Oil Empty Bunches Residue (EFB) Results of Acid Hydrolysis and Enzyme Hydrolysis with Food Waste
Tsaabitah Alyaa Hisaanah, Irnia Nurika, Sri Suhartini

Brawijaya University

Abstract

Technological developments, economic growth, and population growth influence Indonesia^s high energy demands. However, this energy fulfillment primarily uses fossil fuels, negatively impacting the environment. Indonesia is rich in oil palm empty bunches (OPEFBs) and food (FW) as biomass resources for bioethanol (via fermentation) and biogas (via anaerobic digestion (AD) in mono- or co-digestion system). During bioethanol production, solid residues were mostly generated from the hydrolysis step, which is currently still underutilized. This study aimed to evaluate methane and electrical potential from anaerobic co-digestion (ACoD) of OPEFBs and hydrolysis residues with FW. The biochemical methane potential (BMP) test was carried out at 37oC for 28 days, with samples of untreated and treated OPEFBs, acid and enzyme hydrolysis residues, and FW 50:50 and 70:30 ratios. The characteristics of all tested samples showed good potential as biogas feedstocks. The highest specific methane potential (SMP) value was obtained from ACoD of acid hydrolysis residue with FW at a 50:50 ratio, giving the value of 0.403 m3 CH4/kg VS and electrical potential of 1120.421 kWh. The findings demonstrated that ACoD of residual OPEFBs from acid hydrolysis (during bioethanol fermentation) was highly potential to be investigated further. This approach may create integrated biorefinery in bioethanol production.

Keywords: Anaerobic co-digestion- Food waste- Hydrolysis residues- Oil palm empty fruit bunchesst Try to Submit This Sample Abstract

Topic: Renewable energy and biorefinery