Rest methane potential in digestates from farm scale biogas production plants
Biogas plants at farm scale level digesting agricultural waste i.e.manure,represent an important approach to both produce fossil free energy and to reduce GHG emissions from the agriculture.In these processes a high degree of degradation of added substrates is essential in order to reach high methane yield and to minimize risk for methane leakage from the digestate produced.Insufficient degradation of organic matter leads to more degradable matter in the digestate storage tank.The aim of this study was to further investigate the relationship between the rest methane potential (RMP) in the digestate and the efficiency of the biogas plant.To highlight this question the RMP were determined for digestates from 11 Swedish biogas plants.The gas production in the digester was also determined,expressed as volumetric gas production and specific methane production,and used as a measure of the efficiency of the biogas plant.The result showed RMP values from 48 to 145 mL CH4 * g VS-1 and a positive correlation between RMP and the volumetric gas production was found.Furthermore,relating the rest methane potential to the specific methane potential (RMP/SMP) showed a positive correlation with the organic loading rate.Overall the results showed that measurement of rest methane potential can be a useful tool for evaluation of both the degradation efficiency in biogas plants as well as the risk for GHG emissions during digestate storage.
Rest methane potential agricultural waste anaerobic digestion
K.Ahlberg-Eliasson A.Schnürer S.Bergstr(o)m Nilsson
Swedish Rural Economy and Agricultural Society, Box 5007, SE-514 05 L(a)nghem, Sweden Department of Molecular Sciences, BioCenter, Swedish University of Agricultural Sciences, Box 7025,
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
447-450
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）