期刊
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
卷 49, 期 3, 页码 365-377出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10256016.2013.805758
关键词
anaerobic digestion; biogas; carbon-13; methane; methanogenesis; pathways; stable isotope tracer techniques; syntrophic acetate oxidation
资金
- Bavarian State Research Center for Agriculture
Between 2008 and 2010 various batch experiments were carried out to study the stable carbon isotopic composition of biogas (CH4 and CO2) produced from (i) pure sludge and (ii) sludge including maize. From the evolution of the natural isotopic signature, a temporal change of methanogenic pathways could be detected for the treatment with maize showing that a dominance in acetotrophic methanogenesis was replaced by a mixture of hydrogenotrophic and acetotrophic methanogenesis. For pure sludge, hydrogenotrophic methanogenesis was the dominant or probably exclusive pathway. Experiments with isotopically labelled acetate (99% (CH3COONa)-C-13 and 99% (CH3COONa)-C-13) indicated a significant contribution of syntrophic acetate oxidation (SAO) for all the investigated treatments. In the case of pure sludge, experiments from 2008 showed that acetate was almost entirely oxidised to CO2, i.e. acetotrophic methanogenesis was negligible. However, in 2010, the sludge showed a clear dominance in acetotrophic methanogenesis with a minor contribution by SAO indicating a significant change in the metabolic character. Our results indicate that SAO during anaerobic degradation of maize might be a significant process that needs to be considered in biogas research.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据