Effect of pre- and post- UV disinfection conditions on photoreactivation of fecal coliforms from a physiochemical wastewater effluent
Bibliographic record
Abstract
Decreasing photoreactivation after wastewater UV disinfection can lead to considerable savings in capital and operating costs.Objectives of this study were to determine pre-and post-UV irradiation conditions able to decrease fecal coliform photoreactivation in a wastewater effluent from the Montreal Wastewater Treatment Plant.Results of the study indicated that delaying exposure to photoreactivating light for three hours suppressed photoreactivation at UV doses of 10 and 20 mJ/cm 2 .At least 440 lux of visible light was needed to initiate photoreactivation, and 700 lux or greater for maximum effect.Additional experiments showed that photoreactivation was significantly decreased when visible light (400-800 nm) was simultaneously applied prior and during UV irradiation.This was more obvious for winter samples, where photoreactivation was decreased by nearly 50 %.Moreover, the effect of pre-illumination with visible light was maintained for at least 30 minutes.Finally, summer populations were more sensitive to inactivation and less able to photoreactivate than winter populations.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".