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TECHNICAL REPORTS

Atmospheric Pollutants and Trace Gases

Biological Degradation and Greenhouse Gas Emissions during Pre-Storage of Liquid Animal Manure

^a Danish Institute of Agricultural Sciences, Department of Agricultural Engineering, Research Center Bygholm, P.O. Box 536, DK-8700 Horsens, Denmark
^b Biocentrum-DTU, The Technical University of Denmark, DK-2800 Lyngby, Denmark

^* Corresponding author (Henrikb.moller{at}agrsci.dk).

Received for publication December 2, 2002. Storage of manure makes a significant contribution to global methane (CH₄) emissions. Anaerobic digestion of pig and cattle manure in biogas reactors before outside storage might reduce the potential for CH₄ emissions. However, manure pre-stored at 15 to 20°C in buildings before anaerobic digestion may be a significant source of CH₄ and could reduce the potential CH₄ production in the biogas reactor. Degradation of energy-rich organic components in slurry and emissions of CH₄ and carbon dioxide (CO₂) from aerobic and anaerobic degradation processes during pre-storage were examined in the laboratory. Newly mixed slurry was added to vessels and stored at 15 and 20°C for 100 to 220 d. During storage, CH₄ and CO₂ emissions were measured with a dynamic chamber technique. The ratio of decomposition in the subsurface to that at the surface indicated that the aerobic surface processes contributed significantly to CO₂ emission. The measured CH₄ emission was used to calculate the methane conversion factor (MCF) in relation to storage time and temperature, and the total carbon-C emission was used to calculate the decrease in potential CH₄ production by anaerobic digestion following pre-storage. The results show substantial methane and carbon dioxide production from animal manure in an open fed-batch system kept at 15 to 20°C, even for short storage times, but the influence of temperature was not significant at storage times of <30 d. During long-term storage (90 d), a strong influence of temperature on the MCF value, especially for pig manure, was observed.

Abbreviations: MCF, methane conversion factor • VFA, volatile fatty acids • VS, volatile solids

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