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Article

Improving Anaerobic Digestion of Sewage Sludge by Hydrogen Addition: Analysis of Microbial Populations and Process Performance

Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of Leon, Av. de Portugal 41, 24009 Leon, Spain
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Energies 2019, 12(7), 1228; https://doi.org/10.3390/en12071228
Received: 5 March 2019 / Revised: 22 March 2019 / Accepted: 26 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Sustainable Hydrogen Production, Storage and Utilization)
The effect of hydrogen pulse addition on digestion performance of sewage sludge was evaluated as a means for studying the increase in efficiency of methane production. Microbial communities were also evaluated to get an insight of the changes caused by the operational modifications of the digester. An energy evaluation of this alternative was performed considering the theoretical process of coupling bioelectrochemical systems (BES) for the treatment of wastewater along with hydrogen production and the subsequent anaerobic digestion. The addition of hydrogen to sewage sludge digestion resulted in an increase of 12% in biogas production over the control (1353 mL CH4 d−1 at an injection flow rate of 1938 mL H2 d−1). The liquid phase of the sludge reactor and the H2 supplemented one did not show significant differences, thus indicating that the application of hydrogen as the co-substrate was not detrimental. High-throughput sequencing analysis showed slight changes in archaeal relative abundance after hydrogen addition, whereas eubacterial community structure and composition revealed noteworthy shifts. The mass and energy balance indicated that the amount of hydrogen obtained from a hypothetical BES can be assimilated in the sludge digester, improving biogas production, but this configuration was not capable of covering all energy needs under the proposed scenario. View Full-Text
Keywords: sludge digestion; hydrogen addition; microbial community analysis; energy performance sludge digestion; hydrogen addition; microbial community analysis; energy performance
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MDPI and ACS Style

Martínez, E.J.; Sotres, A.; Arenas, C.B.; Blanco, D.; Martínez, O.; Gómez, X. Improving Anaerobic Digestion of Sewage Sludge by Hydrogen Addition: Analysis of Microbial Populations and Process Performance. Energies 2019, 12, 1228. https://doi.org/10.3390/en12071228

AMA Style

Martínez EJ, Sotres A, Arenas CB, Blanco D, Martínez O, Gómez X. Improving Anaerobic Digestion of Sewage Sludge by Hydrogen Addition: Analysis of Microbial Populations and Process Performance. Energies. 2019; 12(7):1228. https://doi.org/10.3390/en12071228

Chicago/Turabian Style

Martínez, Elia J., Ana Sotres, Cristián B. Arenas, Daniel Blanco, Olegario Martínez, and Xiomar Gómez. 2019. "Improving Anaerobic Digestion of Sewage Sludge by Hydrogen Addition: Analysis of Microbial Populations and Process Performance" Energies 12, no. 7: 1228. https://doi.org/10.3390/en12071228

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