Evaporator Scaling at a Zero-effluent BCTMP Mill
Bibliographic record
Abstract
Over the last few decades, many pulp mills have implemented measures to reduce water consumption and maximize effluent reuse. With increasing closure of the effluent cycle, species can accumulate in the process streams and deposit in equipment and piping which negatively impacts the mill operations and product quality. This work focuses on scale formation in the evaporators of a zero-effluent bleached chemi-thermo-mechanical pulp (BCTMP) mill in Canada. The evaporators are used to concentrate the effluent and recover water for process use. In this work, the liquor-side scale deposits were characterized, and a mass balance study was carried out to identify the sources of scaling components in the streams to the evaporators. The third part of this work involved solubility experiments to determine the effects of temperature, degree of concentration, and pH on the solubility of the scaling components. The mass balance and solubility data provide information the mill can use to develop mitigation strategies.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".