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Energies 2019, 12(3), 530; https://doi.org/10.3390/en12030530

Seed Pretreatment for Increased Hydrogen Production Using Mixed-Culture Systems with Advantages over Pure-Culture Systems

1
Institut National de la Recherche Scientifique, Centre—Eau Terre Environnement, 490, Rue de la Couronne, Québec, QC G1K 9A9, Canada
2
Department of Civil Engineering and Water Engineering, Pavilion Adrien-Pouliot, Université Laval, 1065, avenue de la Médecine, Quebec, QC G1V 0A6, Canada
3
National Institute of Technology Warangal, Warangal 506004, India
4
Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, ON M3J 1P3, Canada
5
Centre de Recherche Industrielle du Québec (CRIQ), Québec, QC G1P 4C7, Canada
*
Author to whom correspondence should be addressed.
Received: 13 December 2018 / Revised: 29 January 2019 / Accepted: 31 January 2019 / Published: 7 February 2019
(This article belongs to the Special Issue Sustainable Hydrogen Production, Storage and Utilization)
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Abstract

Hydrogen is an important source of energy and is considered as the future energy carrier post-petroleum era. Nowadays hydrogen production through various methods is being explored and developed to minimize the production costs. Biological hydrogen production has remained an attractive option, highly economical despite low yields. The mixed-culture systems use undefined microbial consortia unlike pure-cultures that use defined microbial species for hydrogen production. This review summarizes mixed-culture system pretreatments such as heat, chemical (acid, alkali), microwave, ultrasound, aeration, and electric current, amongst others, and their combinations to improve the hydrogen yields. The literature representation of pretreatments in mixed-culture systems is as follows: 45–50% heat-treatment, 15–20% chemical, 5–10% microwave, 10–15% combined and 10–15% other treatment. In comparison to pure-culture mixed-culture offers several advantages, such as technical feasibility, minimum inoculum steps, minimum media supplements, ease of operation, and the fact it works on a wide spectrum of low-cost easily available organic wastes for valorization in hydrogen production. In comparison to pure-culture, mixed-culture can eliminate media sterilization (4 h), incubation step (18–36 h), media supplements cost ($4–6 for bioconversion of 1 kg crude glycerol (CG)) and around 10–15 Millijoule (MJ) of energy can be decreased for the single run. View Full-Text
Keywords: chemical; fermentation; hydrogen; heat; microwave; mixed-culture; nanoparticle; organic-wastes; ultrasound chemical; fermentation; hydrogen; heat; microwave; mixed-culture; nanoparticle; organic-wastes; ultrasound
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pachapur, V.L.; Kutty, P.; Pachapur, P.; Brar, S.K.; Le Bihan, Y.; Galvez-Cloutier, R.; Buelna, G. Seed Pretreatment for Increased Hydrogen Production Using Mixed-Culture Systems with Advantages over Pure-Culture Systems. Energies 2019, 12, 530.

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