Side-Stream Comparison of Peracetic Acid and Chlorine as Hypochlorite for Disinfection of Municipal Wastewater Effluent at a Full-Scale Treatment Facility, Ontario, Canada
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Peracetic acid (PAA) has been used as a municipal wastewater disinfectant for over 2 decades, but information about its virucidal performance is limited. Here, we report on a 2 year study of virus disinfection with PAA and chlorine as hypochlorite (NaClO) in a secondary wastewater treatment plant. During year 1, we conducted a side-stream comparison of PAA dosed at 4 mg/L (minus a demand of about 10%) and NaClO at 7.3 mg/L against indigenous enteroviruses and noroviruses, as well as coliphages and Escherichia coli, while assessing PAA fish toxicity under flow-through conditions. During year 1, PAA and NaClO produced poor median log10 reductions (LRs) against enteroviruses and noroviruses, although NaClO LRs were significantly higher. PAA and NaClO performed better against coliphages, but differences were not significant. Against E. coli, PAA and NaClO performed well. 96 hour toxicity testing was done only during year 1, revealing that PAA residual was lethal to rainbow trout only prior to quenching. The PAA dose was reduced to 3 mg/L (minus a demand of about 10%) during year 2 when we enumerated only coliphages and E. coli. F+ male-specific coliphage LRs significantly dropped from 1.2 to 0.5, while E. coli LR remained unchanged. To ensure protection of aquatic life, an interim 0.27 mg/L PAA residual discharge limit was derived.
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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 | 0.000 | 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 | 0.000 |
| 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