Aquatic Toxicity and Environmental Impact of Leachate Discharges from a Municipal Landfill
Bibliographic record
Abstract
Abstract The final leachate from a municipal landfill, using a wetland tertiary treatment system, and water in the receiving environment were chemically characterized and evaluated for acute and sublethal aquatic toxicity. In addition, the effects of leachate discharges on the benthic macroinvertebrate community were determined. Samples were not acutely toxic to rainbow trout (Oncorhynchus mykiss), Daphnia magna and Vibrio fischeri. There was no detrimental effect on the survival and reproduction of Ceriodaphnia dubia, although a slight effect on reproduction was detected in river water at the control station (700 m upstream). Moderate toxicity to Selenastrum capricornutum was detected at the control and at station #2 (40 m from the outfall). Ames tests revealed no mutagenic or cyto-toxic effects in the final leachate or in river water downstream. Benthic macroinvertebrate sampling revealed that the leachate discharge had a localized impact on community structure near the outfall, but by 50 m downstream, the conditions were approaching those upstream of the discharge point.
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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 | 0.003 | 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 | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.062 | 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; both teacher heads agree on what is shown here.
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".