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Energies 2016, 9(5), 368; doi:10.3390/en9050368

Assessment of the Variability of Biogas Production from Sugar Beet Silage as Affected by Movement and Loss of the Produced Alcohols and Organic Acids

1
Institute of Chemical Engineering, Biotechnology and Environmental Technology, Faculty of Engineering, University of Southern Denmark, Campusvej 55, Odense M 5230, Denmark
2
Danish Technological Institute, Agro Food Park 15, Skejby, Aarhus N 8200, Denmark
3
HedeDanmark, Jens Juuls Vej 16, Viby 8260, Denmark
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas E. Amidon
Received: 4 February 2016 / Revised: 19 April 2016 / Accepted: 3 May 2016 / Published: 16 May 2016
(This article belongs to the Collection Bioenergy and Biofuel)
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Abstract

The biochemical methane potential and composition of sugar beet pulp silage were investigated using samples taken from six different depths in both open and closed silos (height 3.6 m). The biochemical methane potential (BMP) of pulp silage in open silos ranged from 337 to 420 normal litre (NL) CH4/kg volatile solids (VS), while the BMP of pulp silage in closed silos varied between 411 and 451 NL CH4/kg VS. The biochemical methane potential peaked at a depth of 1.45 m with 420 NL CH4/kg VS for open silos and 451 NL CH4/kg VS for closed silos. The ethanol concentration and biochemical methane potential showed the same trend with depth throughout the silos. The energy loss correlated to the loss of volatile solids, and the depths described a linear relationship between them for both the open and closed silos (R2 = 0.997 for the open silo and R2 = 0.991 for the closed silo). The energy potentials and composition of beet pulp silage were highly stratified and there was a risk that the silage samples were not representative in investigations of biomass quality for energy production. View Full-Text
Keywords: anaerobic digestion; Beta vulgaris; ensiling; renewable energy; organic components; biomethanation anaerobic digestion; Beta vulgaris; ensiling; renewable energy; organic components; biomethanation
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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Heidarzadeh Vazifehkhoran, A.; Triolo, J.M.; Larsen, S.U.; Stefanek, K.; Sommer, S.G. Assessment of the Variability of Biogas Production from Sugar Beet Silage as Affected by Movement and Loss of the Produced Alcohols and Organic Acids. Energies 2016, 9, 368.

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