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Surface electron-polarized biochar-enhanced anaerobic digestion mechanism revealed by metagenomic binning strategy.
- Source :
-
Chemical Engineering Journal . Sep2023, Vol. 471, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- [Display omitted] • Pigeon manure biochar with electron poor/rich regions on the surface. • Biochar (5 g/L) can significantly increase cumulative methane production. • Adding biochar facilitated the enrichment of methanogenic archaea. • Metagenomes reveal synergistic mechanisms between functional microbes. Inefficient electron transfer is a key bottleneck for anaerobic digestion (AD), which often leads to system instability. Here, we propose for the first time a new strategy to solve the problem by adding surface electron-polarized biochar to enhance methanogenesis by providing electrons to methanogens through surface electron-poor/rich regions. Pyrolysis conversion of pigeon manure to conductive materials (CM) containing electron-poor/rich regions is realized. Different levels of CM (2.5, 5 and 7.5 g/L) are used to enhance methane production from pig manure and rice straw co-digestion systems. It is found that the addition of 5 g/L CM results in the highest cumulative CH 4 production (187.4 ± 8.0 mL/g VS substrate), 35.4% higher (P < 0.05) than the control (0 g/L). Methanogenic archaea are enriched. Synergistic metabolic mechanisms between the functional microorganism bin.CM52.160 (cellulose degradation) and bin.CM03.101 (methane production) are revealed by the metagenomic binning strategy. A large number of potentially unculturable electroactive microorganisms have been identified. This work provides important insights into the construction of micro-electric fields on material surfaces and offers a practical approach to improving AD performance. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ANAEROBIC digestion
*METAGENOMICS
*RICE straw
*BIOCHAR
*CHARGE exchange
Subjects
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 471
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 169789787
- Full Text :
- https://doi.org/10.1016/j.cej.2023.144474