Journal
BIORESOURCE TECHNOLOGY
Volume 265, Issue -, Pages 568-572Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.05.100
Keywords
Biogas; Cocoa waste; Bio-energy; Methane; Agricultural residues
Funding
- grant SENESCYT Convocatoria Abierta 2014
- INER, Ecuador
- Research Foundation Flanders (FWO-Vlaanderen)
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The aim of this work was to evaluate the bioenergy potential of cocoa residue via anaerobic digestion. Batch and fed-batch lab-scale reactors were operated under low and high solids conditions. In the batch tests, 59 +/- 4% of Chemical Oxygen Demand (COD) was recovered as methane. This corresponded with an average methane yield of 174 (wet) and 193 (dry) L kg(-1) volatile solids fed, whereas a series of fed-batch reactors produced 70 +/- 24 (wet) and 107 +/- 39 (dry) L CH4 kg(-1) volatile solids fed during stable conditions. A case study was developed for canton Balao (Ecuador) based on our experimental data, operational estimates and available cocoa waste in the area. Annually, 8341 MWh could be produced, meeting 88% of the current electricity demand in Balao. This case study proves the potential for cocoa waste as a source of renewable energy in rural areas.
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