Aerobic and Anaerobic Naphthenic Acid Biodegradation by Indigenous Tailings Pond Microorganisms
Bibliographic record
Abstract
Surface mining of bitumen extraction from Alberta’s oil sands generates large volumes of oil sands process-affected water (OSPW) that is stored in tailings ponds. Naphthenic acids (NAs) are toxic, corrosive, and complex, cyclic carboxylic acids that accumulate in tailings ponds over time and must be removed for effective reclamation. This work has examined microbial NA biodegradation under aerobic and anaerobic conditions as a possible approach for reclamation. Phosphate stimulation of oxic OSPW resulted in growth of algae (Scenedesmus, Chlorella) and bacteria (Porphyrobacter, Planctomyces) capable of biodegrading low molecular weight NAs resulting in small decreases in acute toxicity. Several new NA-biodegrading bacteria were isolated from OSPW and identified. Additionally, this work has now shown that NA can be biodegraded under nitrate-, iron-, sulfate-reducing and methanogenic conditions and has identified microbial community members likely contributing to NA biodegradation. These findings show that the use of microorganisms for NA remediation may be possible.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 | 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".