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Open AccessArticle

Semi-Continuous Anaerobic Digestion of Orange Peel Waste: Effect of Activated Carbon Addition and Alkaline Pretreatment on the Process

1
Dipartimento di Ingegneria Civile, Università Mediterranea di Reggio Calabria, dell’Energia, dell’Ambiente e dei Materiali, Reggio Calabria IT 89122, Italy
2
Department of Environmental Engineering, Democritus University of Thrace, GR 67100 Xanthi, Greece
*
Authors to whom correspondence should be addressed.
Sustainability 2019, 11(12), 3386; https://doi.org/10.3390/su11123386
Received: 17 May 2019 / Revised: 7 June 2019 / Accepted: 13 June 2019 / Published: 19 June 2019
(This article belongs to the Special Issue Advances in Biorefining of Biowaste)
The valorization of orange peel waste (OPW) is sought worldwide mainly via anaerobic digestion. A common problem encountered during the biological treatment is the seasonality of its production and the presence of d-Limonene. The latter is a typical anti-microbial compound. This work aims to evaluate the effect of the use of granular activated carbon (GAC) combined with alkaline pretreatment to enhance methane generation during semi-continuous anaerobic digestion of OPW. The experimental design consisted of two groups of experiments, A and B. Experiment A was designed to verify the maximum OPW loading and to assess the effect of pH and nutrients on the process. Experiment B was designed to study the effect of alkaline pretreatment alone and of alkaline pretreatment aided by biochar addition to the process. Apart from the methane yields, the d-Limonene contents were measured in all experiments. The preliminary results showed that OPW alkaline pretreatment after the addition of a moderate amount of GAC can render anaerobic digestion of OPW sustainable as long as the organic loading does not exceed 2 gVS·L−1·day−1 and nutrients are supplemented. The experiment in which GAC was added after alkaline pretreatment resulted in the highest methane yield and reactor stability. View Full-Text
Keywords: alkaline pretreatment; anaerobic digestion; d-Limonene; granular activated carbon; orange peel waste alkaline pretreatment; anaerobic digestion; d-Limonene; granular activated carbon; orange peel waste
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Calabrò, P.S.; Fazzino, F.; Folino, A.; Paone, E.; Komilis, D. Semi-Continuous Anaerobic Digestion of Orange Peel Waste: Effect of Activated Carbon Addition and Alkaline Pretreatment on the Process. Sustainability 2019, 11, 3386.

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