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Article

Performance of a Full-Scale Biogas Plant Operation in Greece and Its Impact on the Circular Economy

1
Department of Environmental Engineering, Democritus University of Thrace, 67132 Xanthi, Greece
2
Department of Civil Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3074; https://doi.org/10.3390/w12113074
Received: 23 September 2020 / Revised: 22 October 2020 / Accepted: 27 October 2020 / Published: 2 November 2020
Biogas plants have been started to expand recently in Greece and their positive contribution to the economy is evident. A typical case study is presented which focuses on the long-term monitoring (lasting for one year) of a 500 kW mesophilic biogas plant consisting of an one-stage digester. The main feedstock used was cow manure, supplemented occasionally with chicken manure, corn silage, wheat/ray silage, glycerine, cheese whey, molasses and olive mill wastewater. The mixture of the feedstocks was adjusted based on their availability, cost and biochemical methane potential. The organic loading rate (OLR) varied at 3.42 ± 0.23 kg COD m−3 day−1 (or 2.74 ± 0.18 kg VS m−3 day−1) and resulted in a stable performance in terms of specific biogas production rate (1.27 ± 0.12 m3 m−3 day−1), biogas yield (0.46 ± 0.05 m3 kg−1 VS, 55 ± 1.3% in methane) and electricity production rate (12687 ± 1140 kWh day−1). There were no problems of foaming, nor was there a need for trace metal addition. The digestate was used by the neighboring farmers who observed an improvement in their crop yield. The profit estimates per feedstock indicate that chicken manure is superior to the other feedstocks, while molasses, silages and glycerin result in less profit due to the long distance of the biogas plant from their production source. Finally, the greenhouse gas emissions due to the digestate storage in the open air seem to be minor (0.81% of the methane consumed). View Full-Text
Keywords: biogas plant; full-scale; co-digestion; manure; desulfurization; monitoring; digestate; sustainability; circular economy biogas plant; full-scale; co-digestion; manure; desulfurization; monitoring; digestate; sustainability; circular economy
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MDPI and ACS Style

Spyridonidis, A.; Vasiliadou, I.A.; Akratos, C.S.; Stamatelatou, Κ. Performance of a Full-Scale Biogas Plant Operation in Greece and Its Impact on the Circular Economy. Water 2020, 12, 3074. https://doi.org/10.3390/w12113074

AMA Style

Spyridonidis A, Vasiliadou IA, Akratos CS, Stamatelatou Κ. Performance of a Full-Scale Biogas Plant Operation in Greece and Its Impact on the Circular Economy. Water. 2020; 12(11):3074. https://doi.org/10.3390/w12113074

Chicago/Turabian Style

Spyridonidis, Apostolos; Vasiliadou, Ioanna A.; Akratos, Christos S.; Stamatelatou, Κaterina. 2020. "Performance of a Full-Scale Biogas Plant Operation in Greece and Its Impact on the Circular Economy" Water 12, no. 11: 3074. https://doi.org/10.3390/w12113074

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