Effect of cleanup of spiked sludge on corn growth biosorption and metal leaching
Bibliographic record
Abstract
A chemical leaching process was used for the cleanup of two municipal biosolids (MOS and BES) spiked with Cd, Cu, Zn or their mixture prior to agricultural use. Non-cleaned, cleaned and washed biosolids were compared as soil amendments for corn cultivation in greenhouse. Corn growth, biosorption and metal leaching were measured. Results showed that biosolid amendments tend to produce more aerial biomass. Cleanup and washing of BES biosolid significantly increased total biomass of roots and stalks, respectively. Regarding biosorption of metals, Cd accumulated in roots (0.06–1.13 mg kg−1) and leaves (0.06–0.63 mg kg−1), but not in seeds nor in stalks. Larger amounts of Cu were detected in roots (10.7–18.2 mg kg−1), stalks (1.29–3.78 mg kg−1) and leaves (6.77–20.2 mg kg−1). However, Zn was more accumulated in roots (17.9–74.9 mg kg−1), stalks (6.15–17.1 mg kg−1) and leaves (47.9–90.1 mg kg−1). Whereas Cd and Cu decreased in the order roots > leaves > stalks, Zn decreased from leaves > roots > stalks. Cleanup and washing of MOS and BES biosolids significantly lowered biosorption of Cd (up to 84%), Cu (up to 38%), Zn (up to 63%), and other metals. Concentrations in leachate draining into outlet water varied over time, but on average were moderately low. Significant amounts of metal leached from MOS biosolid. The effects of cleanup and washing of both biosolids on biosorption and leaching depended on the initial metallic charge and the biosolid type.
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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 | 0.001 | 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 | 0.000 |
| 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".