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Article

A Citrus Peel Waste Biorefinery for Ethanol and Methane Production

by
Maria Patsalou
,
Charis G. Samanides
,
Eleni Protopapa
,
Stella Stavrinou
,
Ioannis Vyrides
and
Michalis Koutinas
*
Department of Environmental Science & Technology, Cyprus University of Technology, 30 Archbishop Kyprianou Str., 3036 Limassol, Cyprus
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(13), 2451; https://doi.org/10.3390/molecules24132451
Submission received: 1 June 2019 / Revised: 28 June 2019 / Accepted: 3 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Efficient Technology for the Pretreatment of Biomass II)
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Abstract

This paper deals with the development of a citrus peel waste (CPW) biorefinery that employs low environmental impact technologies for production of ethanol and methane. Three major yeasts were compared for ethanol production in batch fermentations using CPW pretreated through acid hydrolysis and a combination of acid and enzyme hydrolysis. The most efficient conditions for production of CPW-based hydrolyzates included processing at 116 °C for 10 min. Pichia kudriavzevii KVMP10 achieved the highest ethanol production that reached 30.7 g L−1 in fermentations conducted at elevated temperatures (42 °C). A zero-waste biorefinery was introduced by using solid biorefinery residues in repeated batch anaerobic digestion fermentations achieving methane formation of 342 mL gVS−1 (volatile solids). Methane production applying untreated and dried CPW reached a similar level (339–356 mL gVS−1) to the use of the side stream, demonstrating that the developed bioprocess constitutes an advanced alternative to energy intensive methods for biofuel production.
Keywords: bioethanol; biomethane; citrus peel waste; biorefinery; biorefinery residues bioethanol; biomethane; citrus peel waste; biorefinery; biorefinery residues
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MDPI and ACS Style

Patsalou, M.; Samanides, C.G.; Protopapa, E.; Stavrinou, S.; Vyrides, I.; Koutinas, M. A Citrus Peel Waste Biorefinery for Ethanol and Methane Production. Molecules 2019, 24, 2451. https://doi.org/10.3390/molecules24132451

AMA Style

Patsalou M, Samanides CG, Protopapa E, Stavrinou S, Vyrides I, Koutinas M. A Citrus Peel Waste Biorefinery for Ethanol and Methane Production. Molecules. 2019; 24(13):2451. https://doi.org/10.3390/molecules24132451

Chicago/Turabian Style

Patsalou, Maria, Charis G. Samanides, Eleni Protopapa, Stella Stavrinou, Ioannis Vyrides, and Michalis Koutinas. 2019. "A Citrus Peel Waste Biorefinery for Ethanol and Methane Production" Molecules 24, no. 13: 2451. https://doi.org/10.3390/molecules24132451

APA Style

Patsalou, M., Samanides, C. G., Protopapa, E., Stavrinou, S., Vyrides, I., & Koutinas, M. (2019). A Citrus Peel Waste Biorefinery for Ethanol and Methane Production. Molecules, 24(13), 2451. https://doi.org/10.3390/molecules24132451

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