Møller Henrik B, Sommer Sven G, Ahring Birgitte K
Danish Institute of Agricultural Sciences, Department of Agricultural Engineering, Research Center Bygholm, P.O. Box 536, DK-8700 Horsens, Denmark.
J Environ Qual. 2004 Jan-Feb;33(1):27-36. doi: 10.2134/jeq2004.2700.
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 degrees 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 degrees 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 degrees 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.
粪便储存对全球甲烷（CH₄）排放有重大贡献。在露天储存之前，在沼气反应器中对猪粪和牛粪进行厌氧消化可能会降低CH₄排放的可能性。然而，在厌氧消化之前于建筑物内15至20摄氏度下预储存的粪便可能是CH₄的重要来源，并且可能会降低沼气反应器中潜在的CH₄产量。在实验室中研究了预储存期间浆液中富含能量的有机成分的降解以及好氧和厌氧降解过程中CH₄和二氧化碳（CO₂）的排放。将新混合的浆液添加到容器中，并在15和20摄氏度下储存100至220天。在储存期间，使用动态室技术测量CH₄和CO₂排放。地下分解与地表分解的比率表明，好氧表面过程对CO₂排放有显著贡献。测得的CH₄排放用于计算与储存时间和温度相关的甲烷转化因子（MCF），总碳-C排放用于计算预储存后厌氧消化潜在CH₄产量的减少量。结果表明，即使在短储存时间内，在15至20摄氏度的开放式分批饲养系统中，动物粪便也会产生大量的甲烷和二氧化碳，但在储存时间<30天时，温度的影响并不显著。在长期储存（90天）期间，观察到温度对MCF值有强烈影响，尤其是对猪粪而言。
