Abstract
To mitigate the effects of climate change, the emission of greenhouse gases (GHG) should be reduced. In the near future, an increased use of biomass for energy production will be prescribed by law in the European Union (EU) to achieve the target of emission reduction. One possibility to use biomass energetically is its transformation into biogas. The most widely grown crop for this purpose is maize. Although, the increased use of maize as biogas feedstock, due to generous subsidies, is linked to several ecological and (socio)economic problems. The most important are soil erosion, depletion and compaction, high demand and subsequent leaching of fertilizers/biocides, heavy workload, and competition for land between food and energy production. In contrast, the use of second-generation perennial energy crops (PECs) as biogas feedstock can be an auspicious approach to improve the environmental footprint of biomass production. Therefore, we evaluated and compared the biochemical methane potential (BMP) of five different perennial species (cup plant, virginia mallow, tall wheatgrass, giant knotweed, reed canary grass) and a wild plant mix (composite of 25 in parts perennial plants) on three different sites in West-Germany. In terms of methane production per area, tall wheatgrass and reed canary grass exceeded the productivity of maize under favorable conditions. Hence, we recommend both species as biogas feedstock for Central Europe or comparable climates. Additionally, other species might be suitable for biomethanation from an overall perspective, to enhance (agro)biodiversity in rural areas.
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Abbreviations
- 2G:
-
Second generation
- %:
-
Percent per weight
- ADF:
-
Acid detergent fiber
- ADL:
-
Acid detergent lignin
- AEC:
-
Annual energy crops
- amsl:
-
Above mean sea level
- BMP:
-
Biochemical methane potential
- c.v.:
-
Cultivated variety
- DLR:
-
Agricultural Service Center, Rhineland-Palatinate (Dienstleistungszentrum ländlicher Raum)
- EU:
-
European Union
- FM:
-
Fresh matter
- GHG:
-
Greenhouse gas
- ha:
-
Hectare = 100 m ∙ 100 m = 10,000 m2
- NDF:
-
Neutral detergent fiber
- PEC:
-
Perennial energy crops
- t:
-
Tons (= 1 Mg = 1000 kg)
- TS:
-
Total solids
- VS:
-
Volatile solids
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Acknowledgements
The authors would like to thank Sebastian Thielen, Otto Lang, and Dr. Martin Armbruster for the opportunity to take samples from the field trials of the DLR. We would also like to express gratitude to Anaïs Noo and Bénédicte De Vos for their valuable support conducting the BMP measurements.
Funding
This work has been financially supported by the Ministry of Education, Science, Youth & Culture Rhineland-Palatinate, Germany, within the Research Initiative: Trier Centre of Sustainable Studies (TriCSS), 04/2013 – 12/2016, University of Trier.
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Schmidt, A., Lemaigre, S., Delfosse, P. et al. Biochemical methane potential (BMP) of six perennial energy crops cultivated at three different locations in W-Germany. Biomass Conv. Bioref. 8, 873–888 (2018). https://doi.org/10.1007/s13399-018-0338-2
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DOI: https://doi.org/10.1007/s13399-018-0338-2