AI Article Synopsis
- The study investigated how trace elements enhance anaerobic digestion, focusing on their effects on microbial communities.
- The addition of iron (Fe), molybdenum (Mo), selenium (Se), and manganese (Mn) led to significant increases in methane production and reductions in volatile fatty acids (VFAs).
- Trace elements influenced the composition and diversity of microbial communities, increasing the presence of beneficial archaea (Methanosaeta) while revealing a complex relationship between bacterial and archaeal diversity related to methane yields.
Article Abstract
Although trace elements are known to aid anaerobic digestion, their mechanism of action is still unclear. High-throughput sequencing was used to reveal the mechanism by which adding trace elements affects microbial communities and their action. The results showed that the highest methane yields, with addition of Fe, Mo, Se and Mn were 289.2, 289.6, 285.3, 293.0mL/g volatile solids (VS), respectively. The addition of Fe, Mo, Se and Mn significantly (P<0.05) reduced the level of volatile fatty acids (VFAs). The dominant bacteria and archaea were Bacteroidetes and Methanosaeta, respectively. Compared with the proportion of Methanosaeta in the control group, treatment with added trace elements increased Methanosaeta by as much as 12.4%. Microbial community analysis indicated that adding trace elements changed the composition and diversity of archaea and bacteria. Methane yield was positively correlated with bacterial diversity and negatively correlated with archaeal diversity for most treatments.
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| http://dx.doi.org/10.1016/j.biortech.2017.04.071 | DOI Listing |
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