Phosphorus adsorption by naturally-occurring materials and industrial by-products
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Bibliographic record
Abstract
Low cost and effective phosphorus adsorbents are required for the treatment of small or decentralized wastewater systems. The goal of this study was to examine phosphorus adsorption on different low-cost media. Bone char and oven dried alum sludge had the highest Freundlich adsorption constants (K d ) of 1.031 and 0.484, respectively. Maximum adsorption density from the Langmuir isotherm plot was 0.674 mg P g –1 for oven dried alum sludge and 1.787 for air dried alum sludge. pH levels at equilibrium were close to 7 for various dried alum sludge. Experiments conducted at 16 g/L of adsorbent on secondary municipal wastewater showed that all types of dried alum sludge and bone char were the most effective adsorbents of phosphorus. pH levels for oven and air dried sludge were in the range of 6.5–7, whereas the blast furnace slag and cement kiln dust exceeded a pH of 9. Consequently further work was recommended for water plant residuals.Key words: phosphorus, adsorption, Freundlich, Langmuir, alum residual.
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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 | 0.000 |
| 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