Advanced oxidative degradation of bisphenol A and bisphenol S
Bibliographic record
Abstract
In this study, the degradation of two emerging contaminants, bisphenol A (BPA) and bisphenol S (BPS), in spiked water and secondary treated waste water samples were investigated using four different oxidation methods: ultraviolet C (UVC) (254 nm), UVC/hydrogen peroxide (H 2 O 2 ), ozone (O 3 ) and ultraviolet A (UVA)/ozone (365 nm). Investigation of the effect of light intensity on the rate constants of UVC and UVC/hydrogen peroxide processes and identification of intermediates in the degradation process were conducted. The highest degradation rates were achieved for the UVA/ozone process with k values of 2·2 or 1·9 min −1 in secondary treated waste water (absorbance at 254 nm = 0·164 AU). Based on the results, the fate of BPA and BPS in municipal waste water as they move through the UV (254 nm) disinfection unit of a local waste water treatment plant in Calgary, Canada, was evaluated. It was concluded that in the UV disinfection unit, only 1% and 6% of BPA and BPS were degraded respectively. However, should 0·042 M hydrogen peroxide be added to the waste water stream entering the disinfection unit, 56% of BPA and 47% of BPS can be degraded. By implementation of ozone and UVA/ozone processes, degradation levels could exceed >95%.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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".