Impacts of conductive materials on microbial community during syntrophic propionate oxidization for biomethane recovery
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Propionate is one of the most important intermediates in anaerobic digestion, and its degradation requires a syntrophic partnership between propionate‐oxidizing bacteria and hydrogenotrophic methanogens. Anaerobic digestion efficiency can be improved by direct interspecies electron transfer (DIET) through conductive materials. This study aimed to investigate the effects of DIET on syntrophic propionate oxidization under room temperature (20°C) and reveal the syntrophic partners. Firstly, conventional anaerobic consortium and conductive material‐enriched consortium were tested for DIET under high H 2 partial pressure. The latter supplemented with granular activated carbon (GAC) can mitigate H 2 inhibition through DIET. Secondly, a DIET consortium was enriched for testing GAC and magnetite, both showed DIET facilitation. Microbial communities in GAC‐ and magnetite‐supplemented reactors were similar. Syntrophic propionate‐oxidizing bacteria, for example , Smithella (3.9%–9.9%) and a genus from the family Syntrophaceae (1.9%–3.6%) and methanogens Methanobacterium (30.3%–75.2%), Methanolinea (8.5%–25.2%), Methanosaeta (11.4%–36.7%), and Candidatus Methanofastidiosum (3.6%–6.6%), were predominant. Functional genes for cell mobility and membrane transport (3.3% and 9.5% in control reactor) increased with GAC (3.7% and 11.1%, respectively) and magnetite (3.7% and 10.9%, respectively) addition. Syntrophic propionate‐oxidizing bacteria and methanogenesis partners were revealed by co‐occurrence network, for example , Methanobacterium with Smithella , Syntrophobacter , Dechloromonas, and Trichococcus , signifying the importance of the syntrophic partnership in DIET environment. Practitioner points DIET improved syntrophic propionate oxidization under room temperature condition (20°C). Microbial communities were similar for GAC‐ and magnetite‐supplemented reactors, different with control reactor. Syntrophic propionate‐oxidizing bacteria and methanogenesis partners were revealed by co‐occurrence network. Methanobacterium and Smithella , Syntrophobacter , Dechloromonas, and Trichococcus were correlated.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it