点击次数：

论文类型：期刊论文

发表时间：2017-01-01

发表刊物：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录刊物：SCIE、PubMed

卷号：24

期号：1

页面范围：855-863

ISSN号：0944-1344

关键字：Direct interspecies electron transfer (DIET); Anaerobic digestion; Ethanol; Methane production; Syntrophy; Mathematical model

摘要：Recent studies have shown that direct interspecies electron transfer (DIET) plays an important part in contributing to methane production from anaerobic digestion. However, so far anaerobic digestion models that have been proposed only consider two pathways for methane production, namely, acetoclastic methanogenesis and hydrogenotrophic methanogenesis, via indirect interspecies hydrogen transfer, which lacks an effective way for incorporating DIET into this paradigm. In this work, a new mathematical model is specifically developed to describe DIET process in anaerobic digestion through introducing extracellular electron transfer as a new pathway for methane production, taking anaerobic transformation of ethanol to methane as an example. The developed model was able to successfully predict experimental data on methane dynamics under different experimental conditions, supporting the validity of the developed model. Modeling predictions clearly demonstrated that DIET plays an important role in contributing to overall methane production (up to 33 %) and conductive material (i.e., carbon cloth) addition would significantly promote DIET through increasing ethanol conversion rate and methane production rate. The model developed in this work will potentially enhance our current understanding on syntrophic metabolism via DIET.