Investigating clogging failure mechanisms of leachate extraction wells in landfills
Bibliographic record
Abstract
To help reduce leachate heads in lined and unlined landfills, vertical leachate abstraction wells are commonly used. The effectiveness of vertical wells in landfills is, however, often perceived to be poor and to deteriorate over time. To investigate possible reasons for this, a downwell closed-circuit television (CCTV) survey of 25 leachate wells was carried out. Observations revealed significant corrosion of steel well screens, although only within the permanently unsaturated zone. Within the saturated parts of the well, corrosion of the screen and clogging did not occur. No biological fouling was observed in any of the wells examined. Exhumation and examination of three steel well screens from a landfill demonstrated significant screen corrosion in the unsaturated zone, with up to a 6 mm loss in section. Within the saturated zone, the gravel pack from each well showed no evidence of biological clogging, but there was some invasion of the gravel by intermediate cover material in two wells that had been developed.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".