Anaerobic co-digestion of coffee husks and microalgal biomass after thermal hydrolysis.
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Date
2018
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Abstract
Residual coffee husks after seed processing may be better profited if bioconverted into energy through anaerobic
digestion. This process may be improved by implementing a pretreatment step and by co-digesting the coffee
husks with a more liquid biomass. In this context, this study aimed at evaluating the anaerobic co-digestion of
coffee husks with microalgal biomass. For this, both substrates were pretreated separately and in a mixture for
attaining 15% of total solids (TS), which was demonstrated to be the minimum solid content for pretreatment of
coffee husks. The results showed that the anaerobic co-digestion presented a synergistic effect, leading to 17%
higher methane yield compared to the theoretical value of both substrates biodegraded separately. Furthermore,
thermal hydrolysis pretreatment increased coffee husks anaerobic biodegradability. For co-digestion trials, the
highest values were reached for pretreatment at 120 °C for 60 min, which led to 196 mLCH4/gVS and maximum
methane production rate of 0.38 d−1.
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Keywords
Anaerobic co-digestion, Lignocellulosic biomass, Biorefinery, Biogas
Citation
PASSOS, F. et al. Anaerobic co-digestion of coffee husks and microalgal biomass after thermal hydrolysis. Bioresource Technology, v. 253, p. 49-54, 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0960852417322162>. Acesso em: 05 abr. 2018.