Preliminary investigation into factors affecting controlled struvite crystallization at the bench scale
Why this work is in the frame
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Bibliographic record
Abstract
A preliminary investigation of factors affecting controlled struvite crystallization was conducted in bench-scale studies using a new crystallization reactor design, operating under a range of reactor and feed strength conditions. In 21 different experiments, it was found that the bench-scale reactor functioned well in terms of achieving good particle classification, although its performance was somewhat restricted in terms of P removal. Reactor operation was generally somewhat compromised because of scale effects. As a preliminary to further (ongoing) pilot-scale investigations, it was found that, for a given set of operating and feed strength conditions, there was a specific value of pH (pH lim ) beyond which the reactor would not operate effectively. The pH value is an important operating parameter in struvite crystallization, and the mode of pH operation plays a major role in determining struvite crystal quality. When operated at pH values exceeding pH lim , poor quality (i.e., dendritic) crystals were produced and reactor plugging often occurred. A qualitative assessment of temperature effects on crystallization reactions suggested that low temperatures may indeed favour struvite crystal growth. Reactor seeding was not found to be a factor of any particular importance since, once struvite crystallization reactions were underway, the reactor appeared to be "self-seeding". Key words: Crystallization, phosphorus removal, struvite, environmental sustainability, bench-scale studies, phosphorus recovery.
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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 | 0.001 | 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