The treatment of high strength wastewater containing high concentrations of ammonium in a staged anaerobic and aerobic membrane bioreactor
Bibliographic record
Abstract
In this paper, a staged anaerobic and aerobic membrane bioreactor was constructed and used to study the treatment of high strength wastewater containing high concentrations of ammonium. The membrane module was submerged in the aerobic zone (upper part) of the bioreactor and was operated under an alternating suction mode and air backwash mode. Air backwash and aeration around the membrane module served as the cleaning mechanism for the membrane; this resulted in the steady operation of the reactor at the flux of 514 L m 2 h 1 for 120200 h without any additional cleaning. The efficiencies of the chemical oxygen demand (COD) removal were >99% for up to 10.08 g COD L 1 d 1 of the volumetric loading rate. Between 60 and 80% of COD was anaerobically biodegraded in the anaerobic zone (lower part) of the reactor and converted to methane that could serve as a carbon source for the denitrification in the upper part of the reactor. The intermittent aeration resulted in simultaneous nitrification and denitrification in the aerobic zone of the reactor. The capacity of the ammonium removal reached 0.5 g NH 4 + -N L 1 d 1 . Between 84 and 94% of the total oxidized nitrogen converted from the oxidization of ammonium was denitrified. Key words: air backwash membrane bioreactor (MBR), high strength wastewater, anaerobic and aerobic treatment, ammonium removal, methanotrophic denitrification.
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How this classification was reachedexpand
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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".