Journal
ENERGIES
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/en14112990
Keywords
microbial lignin degradation; gut microbiome; Enterobacter hormaechei KA3; biogas production; microbial community
Categories
Funding
- Fundamental Research Funds for the Central Universities [lzujbky-2020-29]
- Natural Science Foundation of Gansu Province [20JR10RA620]
- National Natural Science Foundation [3187008]
- Gansu Province major science and technology projects [17ZD2WA017]
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An efficient ligninolytic strain Enterobacter hormaechei KA3 was isolated from the gut microbiomes of lignin-feeding insects, showing better lignin-degrading ability for corn straw and significantly improved methane yield in anaerobic digestion. This study provides a new microbial resource for lignin degradation with practical applications.
Lignin-feeding insect gut is a natural ligninolytic microbial bank for the sustainable conversion of crop straw to biogas. However, limited studies have been done on highly efficient microbes. Here, an efficient ligninolytic strain Enterobacter hormaechei KA3 was isolated from the gut microbiomes of lignin-feeding Hypomeces squamosus Fabricius, and its effects on lignin degradation and anaerobic digestion were investigated. No research has been reported. Results showed that strain KA3 had better lignin-degrading ability for corn straw with a higher lignin-degrading rate (32.05%) and lignin peroxidase activity (585.2 U/L). Furthermore, the highest cumulative biogas yield (59.19 L/kg-VS) and methane yield (14.76 L/kg-VS) were obtained for KA3 inoculation, which increased by 20% and 31%, respectively, compared to CK. Higher removal rates of COD, TS, and vs. of 41.6%, 43.11%, and 66.59% were also found. Moreover, microbial community diversity increased as digestion time prolonged in TG, and bacteria were more diverse than archaea. The dominant genus taxon, for methanogens, was Methanosate in TG, while in CK was Methanosarcina. For bacteria, dominant taxa were similar for all groups, which were Solibacillus and Clostridium. Therefore, strain KA3 improved the methane conversion of the substrate. This study could provide a new microbial resource and practical application base for lignin degradation.
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