Hydrogen production by dark fermentation process from pig manure, cocoa mucilage, and coffee mucilage
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2020-05-26
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gruplac
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Abstract
The aim of this study was the evaluation of the influence of temperature, initial organic load, and C/N ratio in the biochemical
hydrogen potential (BHP) by dark fermentation (DF) of mixtures composed of residual biomass derived from the Colombian
agro-industry (pig manure, cocoa mucilage, and coffee mucilage) to contribute to residue management and the development of a
bio-based economy in Colombia. A Box-Behnken experimental design was constructed, where the variables were as follows:
three initial organic loads (2, 5, and 8 g COD/l), three C/N ratios (25, 35, and 45), and three different coffee and cocoa initial COD
ratios (coffee mucilage (CFM):cocoa mucilage (CCM)) (1:3, 2:2, and 3:1). The experiments were carried out at thermophilic
environments of 55 °C and 45 °C. Sludge from an anaerobic digester pretreated by thermal shock was used as an inoculum. The
results of the experimental designs were used (one per temperature) to model the system mathematically. Also, a mathematical
model MARS (multivariate adaptive regression splines) was used as an alternative method to corroborate the optimal points
obtained. In both models, it was evidenced that at 55 °C and 45 °C, the best mixing conditions indicated a C/N ratio of 45 and the
lowest CFM:CCM with a value close to 1:3. Likewise, it was evidenced that at the temperature of 55 °C, the optimum organic
load is 8 g COD/l, while 45 °C is 2 g COD/l. Moreover, it was determined that CFM:CCM has less influence than the other
independent variables studied, a factor that favors the country’s scope, due to the availability of these two substrates is not
permanent throughout the year
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Rangel, C.J., Hernández, M.A., Mosquera, J.D. et al. Hydrogen production by dark fermentation process from pig manure, cocoa mucilage, and coffee mucilage. Biomass Conv. Bioref. (2020). https://doi.org/10.1007/s13399-020-00618-z
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Atribución-NoComercial-SinDerivadas 2.5 Colombia