Reuse of Air for Return Activated Sludge Pumping in Submerged Membrane Bioreactors
Bibliographic record
Abstract
Abstract The reuse of air added for gas sparging to airlift return activated sludge (RAS) in a membrane bioreactor (MBR) was investigated. Numerical modeling suggests that the RAS conveyance requirements in an MBR could be met for systems with a treatment capacity of ≤3.8 · 106 L d−1, and potentially for larger MBRs, depending on the system design (i.e., U‐shaped rather than linear systems). Pilot scale validation confirmed that airlift could be used to meet the RAS conveyance requirements. Optimal conditions were obtained for pilot scale systems with square air collectors, intermediate/large air collector angles, greater depth of submergence and individual tubing to redirect the airlifted flow. Implementation of airlift RAS conveyance in small to intermediate size MBRs can results in a reduction of approximately 20 % in operating costs.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".