The microbial characterization of a hydroponic treatment step for domestic wastewater — towards an expanded view on the plant–microbial hydroecology
Bibliographic record
Abstract
The aim of this study was to explore the microbial composition in the hydroponic step of a pilot plant for treatment of domestic wastewater under temperate climate conditions. The pilot plant was designed for nitrogen removal and operated at constant conditions. The microbial composition was investigated over a period of 6 months using fluorescence in situ hybridization (FISH) to identify key microbial groups. Nitrification rate measurements confirmed the presence and activity of aerobic nitrifying populations. The FISH analysis demonstrated that Proteobacteria, followed by Nitrospirae and Planctomycetes, represented the three most abundant bacterial groups. Interestingly, further FISH studies suggested the presence of one other bacterial group associated with ammonium-oxidizing processes: anaerobic ammonium-oxidizing bacteria within the Planctomycetales. This suggests that the nitrogen turnover in hydroponics systems may be attributed to more complex processes than previous models based only on those performed by aerobic ammonium-oxidizing bacteria.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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".