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Mitigation of greenhouse gas emissions by anaerobic digestion of cattle slurry [An article from: Agriculture, Ecosystems and Environment]
Book Details
PublisherElsevier
ISBN / ASINB000RR52NQ
ISBN-13978B000RR52N5
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Biogas treatment of animal manures is an upcoming technology because it is a way of producing renewable energy (biogas). However, little is known about effects of this management strategy on greenhouse gas (GHG) emissions during fermentation, storage, and field application of the substrates compared to untreated slurries. In this study, we compared cattle slurry and cattle slurry with potato starch as additive during the process of fermentation, during storage and after field application. The addition of potato starch strongly enhanced CH"4 production from 4230l CH"4 m^-^3 to 8625l CH"4 m^-^3 in the fermenter at a hydraulic retention time (HRT) of 29 days. Extending the HRT to 56 days had only a small effect on the CH"4 production. Methane emissions from stored slurry depended on storage temperature and were highest from unfermented slurry followed by the slurry/starch mixture. Gas emissions from untreated and fermented slurry during storage were further analyzed in a pilot-scale experiment with different levels of covering such as straw cover, a wooden lid and no cover. Emissions of greenhouse gases (CH"4, N"2O, NH"3) were in the range of 14.3-17.1kg CO"2 eq.m^-^3 during winter (100 day storage period) and 40.5-90.5kg CO"2 eq.m^-^3 during summer (140 day storage period). A straw cover reduced NH"3 losses, but not overall GHG emissions, whereas a solid cover reduced CH"4 and NH"3 emissions. After field application, there were no significant differences between slurry types in GHG emissions (4.15-8.12kg CO"2 eq.m^-^3a^-^1). GHG emissions from slurry stores were more important than emissions after field application. Co-digestion of slurry with additives such as starch has a large potential to substitute fossil energy by biogas. On a biogas plant, slurry stores should be covered gas-tight in order to eliminate GHG emissions and collect CH"4 for electricity production.
Description:
Biogas treatment of animal manures is an upcoming technology because it is a way of producing renewable energy (biogas). However, little is known about effects of this management strategy on greenhouse gas (GHG) emissions during fermentation, storage, and field application of the substrates compared to untreated slurries. In this study, we compared cattle slurry and cattle slurry with potato starch as additive during the process of fermentation, during storage and after field application. The addition of potato starch strongly enhanced CH"4 production from 4230l CH"4 m^-^3 to 8625l CH"4 m^-^3 in the fermenter at a hydraulic retention time (HRT) of 29 days. Extending the HRT to 56 days had only a small effect on the CH"4 production. Methane emissions from stored slurry depended on storage temperature and were highest from unfermented slurry followed by the slurry/starch mixture. Gas emissions from untreated and fermented slurry during storage were further analyzed in a pilot-scale experiment with different levels of covering such as straw cover, a wooden lid and no cover. Emissions of greenhouse gases (CH"4, N"2O, NH"3) were in the range of 14.3-17.1kg CO"2 eq.m^-^3 during winter (100 day storage period) and 40.5-90.5kg CO"2 eq.m^-^3 during summer (140 day storage period). A straw cover reduced NH"3 losses, but not overall GHG emissions, whereas a solid cover reduced CH"4 and NH"3 emissions. After field application, there were no significant differences between slurry types in GHG emissions (4.15-8.12kg CO"2 eq.m^-^3a^-^1). GHG emissions from slurry stores were more important than emissions after field application. Co-digestion of slurry with additives such as starch has a large potential to substitute fossil energy by biogas. On a biogas plant, slurry stores should be covered gas-tight in order to eliminate GHG emissions and collect CH"4 for electricity production.
