期刊
WASTE MANAGEMENT
卷 71, 期 -, 页码 749-756出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2017.04.005
关键词
Food waste; Anaerobic digestion; Methanogenic pathway; Radioactive isotope labelling; Ammonia inhibition
资金
- European Union 7th Framework programme [241334]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/K026216/1]
- Engineering and Physical Sciences Research Council [EP/K026216/1] Funding Source: researchfish
- EPSRC [EP/K026216/1] Funding Source: UKRI
Ammonia concentration is one of the key factors influencing the methanogenic community composition and dominant methanogenic pathway in anaerobic digesters. This study adopted a radiolabelling technique using [2-C-14] acetate to investigate the relationship between total ammonia nitrogen (TAN) and the methanogenic pathway. The radiolabelling experiments determined the ratio of (CO2)-C-14 and (CH4)-C-14 in the biogas which was used to quantitatively determine the percentage of CH4 derived from acetoclastic and syntrophic acetate oxidation routes, respectively. This technique was performed on a selection of mesophilic digesters representing samples of low to high TAN concentrations (0.2-11.1 g kg(-1) wet weight). In high TAN digesters, the ratio between (CO2)-C-14 and (CH4)-C-14 was in the range 2.1-3.0; indicating 68-75% of methane was produced via the hydrogenotrophic route; whereas in low ammonia samples the ratio was 0.1-0.3, indicating 9-23% of methane was produced by the hydrogenotrophic route. These findings have been confirmed further by phylogenetic studies. (C) 2017 The Authors. Published by Elsevier Ltd.
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