Regulations in the United States: requirements and guidance for ultraviolet disinfection of drinking water
Bibliographic record
Abstract
In July 2003, the US Environmental Protection Agency (USEPA) published a proposed regulation, the Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR), which included requirements pertaining to ultraviolet (UV) disinfection. In addition the USEPA released the proposed UV Disinfection Guidance Manual (UVDGM) that provides implementation guidelines for UV disinfection. Since July 2003, USEPA has revised several elements, which are also described. This paper summarizes proposed regulatory requirements in the United States (US) that pertain to disinfection of drinking water using UV light and the recommendations in USEPA's UVDGM. Although this paper does not provide the detailed UVDGM recommendations, it highlights important elements of the proposed regulation and guidance, including required UV doses, UV facility design and operation, and UV reactor validation. The US regulations and guidance do not directly affect the implementation of UV facilities in other countries; however, the information provided in this paper provides a different perspective for worldwide facilities and regulatory agencies to consider. Key words: ultraviolet, disinfection, regulations, guidance, UV facility design, validation, UV dose.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.014 | 0.017 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.007 | 0.004 |
| Insufficient payload (model declined to judge) | 0.009 | 0.007 |
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 source (direct Gemma or distilled Codex), 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".