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Utilization of Food and Agricultural Residues for a Flexible Biogas Production: Process Stability and Effects on Needed Biogas Storage Capacities

1
Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, Austria
2
Department of Sustainable Agricultural Systems, Institute of Agricultural Engineering, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
3
Bavarian State Research Center for Agriculture, Central Department for Quality Assurance and Analytics, 85354 Freising, Germany
*
Author to whom correspondence should be addressed.
This research was conducted in equal part by Ervin Saracevic and Susanne Frühauf.
Energies 2019, 12(14), 2678; https://doi.org/10.3390/en12142678
Received: 14 June 2019 / Revised: 5 July 2019 / Accepted: 7 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Production and Utilization of Biogas)
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Abstract

Biogas plants can contribute to future energy systems’ stability through flexible power generation. To provide power flexibly, a demand-oriented biogas supply is necessary, which may be ensured by applying flexible feeding strategies. In this study, the impacts of applying three different feeding strategies (1x, 3x and 9x feeding per day) on the biogas and methane production and process stability parameters were determined for a biogas plant with a focus on waste treatment. Two feedstocks that differed in (1) high fat and (2) higher carbohydrate content were investigated during semi-continuous fermentation tests. Measurements of the short chain fatty acids concentration, pH value, TVA/TIC ratio and total ammonium and ammonia content along with a molecular biology analysis were conducted to assess the effects on process stability. The results show that flexible biogas production can be obtained without negative impacts on the process performance and that production peaks in biogas and methane can be significantly shifted to another time by changing feeding intervals. Implementing the fermentation tests’ results into a biogas plant simulation model and an assessment of power generation scenarios focusing on peak-time power generation revealed a considerable reduction potential for the needed biogas storage capacity of up to 73.7%. View Full-Text
Keywords: Semi-continuous fermentation; Anaerobic digestion; Food waste; Biogas; Process simulation; Biogas storage Semi-continuous fermentation; Anaerobic digestion; Food waste; Biogas; Process simulation; Biogas storage
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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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Saracevic, E.; Frühauf, S.; Miltner, A.; Karnpakdee, K.; Munk, B.; Lebuhn, M.; Wlcek, B.; Leber, J.; Lizasoain, J.; Friedl, A.; Gronauer, A.; Bauer, A. Utilization of Food and Agricultural Residues for a Flexible Biogas Production: Process Stability and Effects on Needed Biogas Storage Capacities. Energies 2019, 12, 2678.

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