Collimated beam tests: their limitations for assessing wastewater disinfectability by UV, and a proposal for an additional evaluation parameter
Why this work is in the frame
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Bibliographic record
Abstract
This study examines the effects of the liquid matrix on the disinfectability of waters and wastewaters by ultraviolet (UV) light. Collimated beam (CB) curves, which are routinely used to assess disinfectability, and to provide the average fluence (in microjoules per square centimetre) necessary to reach a target effluent microbial count, eliminate the effect of UV transmission (UVT), using the Morowitz equation. However, this calculation has the consequence of masking the differences between samples of differing UVT, which may indeed require the same average UV fluence to reach the target, but require considerably different energy input and number of lamps in the full-scale system. An additional parameter, called herein an "energy factor'', is proposed in addition to the CB curve to evaluate disinfectability. The energy factor is the applied UV energy per unit volume divided by the average fluence experienced by the microbes in the liquid matrix. Synthetic data and actual CB curves from various types of samples are used to assess the effects of UVT, the depth of sample in the petri dish, the slope of the CB curve, the target microbial count, and, finally, the original microbial count on the energy factor. Key words: ultraviolet disinfection, collimated beam, energy factor.
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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 | 0.002 | 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 | 0.001 |
| 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 it