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This article in JEQ

  1. Vol. 33 No. 1, p. 27-36
     
    Received: Dec 2, 2002
    Published: Jan, 2004


    * Corresponding author(s): Henrikb.moller@agrsci.dk
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doi:10.2134/jeq2004.2700

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

  1. Henrik B. Møller *a,
  2. Sven G. Sommera and
  3. Birgitte K. Ahringb
  1. 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

Abstract

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.

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