The Poly(3‐Hydroxybutyrate) Production From the Mixed Culture With the Leachate Obtained From Wastewater Sludge Pretreated by the Electrochemical Process
Why this work is in the frame
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Bibliographic record
Abstract
Polyhydroxyalkanoates (PHAs) are biodegradable plastics with great environmental and application value, yet high production costs, mainly from carbon sources, hinder their large-scale use. In sludge dewatering by electrochemical treatment followed by press filtration, leachate with rich organic matter is produced and considered a cheap carbon source. This study converted the leachate to volatile fatty acids (VFAs) under anaerobic fermentation at 35°C and pH 5.5. The PHA was produced from a PHA-producing mixed culture acclimated from wastewater sludge. The VFAs were fed to the mixed culture. The highest PHA content was 42% (g/g VSS). The PHA contains 55% of polyhydroxybutyrate (PHB) and 45% of polyhydroxyvalerate (PHV). When the VFAs were generated from the leachate of the sludge treated with the electrochemical process, the PHA content dropped to 17%. With the treatment of the VFAs or leachate, the PHA content was increased. The highest PHA content was up to 35% (g/g VSS). In addition, co-fermentation of VFAs and acetic acid for PHA production has also shown improvement in PHA accumulation. The study provides an alternative method for PHA production and managing the leachate produced from the electrochemical process for sludge dewatering.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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