Orthophosphate and Residence Time Impacts in Chloraminated Model Distribution Systems
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
ABSTRACT The combined effects of orthophosphate addition and residence time on chloramine stability, biofilm development, and nitrification potential in drinking water distribution systems (DWDSs) remain unexplored. Most previous studies examined orthophosphate dose under fixed residence time conditions, leaving a gap in understanding how water age modifies these impacts. This study evaluated the effects of orthophosphate and residence time (6/12 days) on monochloramine decay, biofilm growth, and nitrification potential using bench‐scale systems. At the 12‐day residence time, chloramine decay, biofilm growth, and nitrite accumulation were significantly greater, with orthophosphate amplifying these effects. Biofilm metabolic activity initially increased with orthophosphate before converging with the control, while bulk water metabolic activity remained higher. Genetic profiling revealed microbial community shifts under extended residence time and orthophosphate. These findings demonstrate that orthophosphate, when combined with longer residence times, can accelerate microbial activity and nitrification, highlighting the need to manage both factors to safeguard water quality.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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