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Tytuł:
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Novel thermodynamic early warning method for anaerobic digestion failure of energy crops.
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Autorzy:
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Xiao F; Laboratory of Biomass Bio-chemical Conversion, GuangZhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Li Y; Laboratory of Biomass Bio-chemical Conversion, GuangZhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China.
Sun Y; Laboratory of Biomass Bio-chemical Conversion, GuangZhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China. Electronic address: .
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Źródło:
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Bioresource technology [Bioresour Technol] 2020 Aug; Vol. 310, pp. 123440. Date of Electronic Publication: 2020 Apr 24.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991-
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MeSH Terms:
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Bioreactors*
Fatty Acids, Volatile*
Anaerobiosis ; Biofuels ; Methane ; Thermodynamics
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Contributed Indexing:
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Keywords: Early warning; Energy crop; Gibbs free energy; Thermodynamics
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Substance Nomenclature:
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0 (Biofuels)
0 (Fatty Acids, Volatile)
OP0UW79H66 (Methane)
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Entry Date(s):
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Date Created: 20200504 Date Completed: 20200525 Latest Revision: 20200525
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Update Code:
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20240105
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DOI:
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10.1016/j.biortech.2020.123440
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PMID:
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32361203
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To investigate whether thermodynamic calculations of anaerobic digestion processes can be applied to the early warning for unstable anaerobic digestion, a group of semi-continuous digesters fed with an energy crop (Hybrid Pennisetum) were operated via a step-wise increase in the organic load rates until overload occurred. Traditional early warning indicators, such as biogas production and content, pH, alkalinity, and volatile fatty acids as well as the methane/carbon dioxide (CH 4 /CO 2 ) and volatile fatty acid/alkalinity ratios, were regularly monitored during the process. The Gibbs free energy changes (ΔG) of the methanogenesis phases of valerate, butyrate, and propionate were calculated based on Nernst and Van't Hoff equations. The results demonstrate that ΔG of the three syntrophic methanogenesis phases can be used as an early warning indicator for unstable anaerobic digestion, indicating anaerobic digestion failure (ceased biogas production) up to 21 days in advance, that is, 1-8 days earlier than some other indicators.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
