Biogas production from the organic fraction of municipal solid waste is enhanced by nickel addition in a two-stage system compared with a conventional digester
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The stability of conventional single-stage anaerobic digestion has limitations and requires strategies to enhance biogas production, including two-stage anaerobic digestion (TSAD) and trace metals addition (Ni2+). This research was focused on determining the effect of the supplementation of different concentrations of Ni2+ on a TSAD compared with a conventional process. In the first stage (hydrogen-producing reactor), the Ni2+ concentrations evaluated were 0, 0.1, and 0.5 mg Ni2+/gVSinoculum. The acidogenic effluents were fed in the second stage to produce CH4-rich biogas. The results showed that it was possible to increase the CH4-productivity and the specific methane production by 72% and 105%, respectively, by operating in TSAD compared with the conventional anaerobic digester. The Ni2+ addition improved the stability of the first and second stages, allowing higher biogas production. The microbial communities’ composition at the phylum level changed in each stage.
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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 | 0.000 | 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