Development, laboratory and pilot testing of an innovative single sludge step-feed anoxic–aerobic nitrogen removal process
Bibliographic record
Abstract
A single-sludge step-feed anoxic–aerobic process (SSFAOP), characterized by enhanced nitrogen reduction performance, long solids retention time (SRT), and short aerobic hydraulic retention time (HRT), was designed to optimize nitrification and denitrification processes for ammonia and nitrogen removal. The favorable conditions for nitrifying bacteria were provided by using influent flow splitting and step feeding. The relative predominance of nitrifying bacteria resulted in an increase of nitrification rate and decrease of nitrification time. In addition, the SSFAOP process design and operation were optimized by computer simulation and laboratory testing. The optimum operating parameters were determined through laboratory and pilot testing by evaluating the effects of temperature, pH, and dissolved oxygen (DO) on ammonia reduction efficiencies and treatment performance. The laboratory and pilot testing results demonstrated that the SSFAOP was a cost-effective process for nitrogen reduction. It is, therefore, feasible to implement industrial full-scale applications in wastewater treatment plants.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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 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".