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.
Highlights
Biogas needs to become a major contributor to green energy production if the EU is to meet its target of 55% of gross final energy consumption being provided by renewable energy by 2050 [1,2]
Since the storage temperature was relatively low during this period, it was assumed that the storage of whole beets from November to February may only have had a relatively limited effect on the results of the storage trial
This study shows that energy and losses vary at at different depths due to to thethe movement of of
Summary
Biogas needs to become a major contributor to green energy production if the EU is to meet its target of 55% of gross final energy consumption being provided by renewable energy by 2050 [1,2]and if the Danish government is to meet its goal of 100% of energy consumption being provided by renewable energy [3]. Wind power will probably provide 60%–80% of total electricity consumption, including transport uses such as plug-in vehicles, in a Danish non-fossil energy scenario [4]. The Danish government has set a 40% target for the use of animal manure in biogas production by 2020, whereas in 2012 just 7%–8% of animal manure was used for biogas production [6]. This means that animal manure use for anaerobic digestion (AD) has to increase about tenfold [7,8]. The energy content of animal manure is low due to its high water content, and its organic matter is not digestible, co-digestion with digestible organic biomass is required if biogas production is to be profitable [9,10]
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