A reduced-complexity N-cycle model consortium of nitrifiers and denitrifiers used to study bioflocculation mechanisms in biological wastewater treatment.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| N-cycle bacterial consortium members — ontology label: Bacteria | NCBITaxon:2 · TaxonMech · TraitMech |
CROSS_FEEDER
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N/A |
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
Alginate-Entrapped Nitrifier Microcolony Formation
Alginate entrapment during oxic/anoxic reactor cycles produced stable nitrifier microcolonies, mostly composed of one species. Microcolonies persisted after alginate dissolution with retained N-cycle activity. The artificial retention matrix is not itself a demonstrated interspecies colonization-facilitation interaction.
Biological Processes:
- biofilm formation (GO:0042710 · PathwayMech)
Released nitrifier microcolonies provided building blocks incorporated into mixed denitrifier macroclusters after centrifugation and resuspension in calcium-rich HEPES-buffered medium. Release alone did not yield these macroclusters. PARTIAL - Calcium bridging is proposed; its contribution was not fully decoupled from centrifugation.
Evidence
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PMID:40536564 - SUPPORT (IN_VITRO)"Strong nitrifier microcolonies were formed during oxic/anoxic cycles in sequencing batch reactors, using alginate entrapment as a cell retention system."
Nitrifier-Denitrifier Macrocluster Formation
Mixed macroclusters containing nitrifier colonies and Azoarcus flocs appeared after centrifugation at 3000 g for 10 min and resuspension in calcium-rich HEPES-buffered medium, persisting for about 10 days under aerobic stirring. Release alone did not generate these structures. FISH preparation caused separate artefactual aggregation; the later suspended macroclusters were a real positive result. Calcium and centrifugation effects were not fully decoupled.
Biological Processes:
- biofilm formation (GO:0042710 · PathwayMech)
Evidence
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PMID:40536564 - SUPPORT (IN_VITRO)"After the release of these aggregates into suspension, macroclusters with flocs of the denitrifier were observed"
Bottom-Up Activated Sludge Floc Model
The nitrifier-microcolony/denitrifier-floc assembly provides a reduced bottom-up proof-of-concept model of activated-sludge flocs. It retains N-cycle function, but its use as a model is an interpretation of the same assembly, not a separate downstream biological event or proof of full-scale performance. The authors recommend operation that separates medium exchange from centrifugation when testing calcium effects.
Biological Processes:
- biofilm formation (GO:0042710 · PathwayMech)
Evidence
-
PMID:40536564 - SUPPORT (IN_VITRO)"a living model of a full-scale activated sludge floc can be built through the use of this bottom-up approach"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Which observations distinguish activity and causal mediation from inferred potential?
Preserve stable nitrifier microcolonies, real mixed macroclusters and retained nitrogen cycling. Separate FISH-induced artefacts from unstained suspension observations. Selectively test calcium/cation bridging without centrifugation and characterize matrix composition before claiming an isolated EPS mechanism or biotic facilitation. Remove the model-utility workflow arrow, not the positive physical assembly result.
Attaches to: ecological_interactions#Alginate-Entrapped Nitrifier Microcolony Formation, ecological_interactions#Nitrifier-Denitrifier Macrocluster Formation, ecological_interactions#Bottom-Up Activated Sludge Floc Model
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| oxic/anoxic sequencing batch reactor cycling | Oxic/anoxic cycles and alginate entrapment were used to produce nitrifier microcolonies and mixed aggregates. | N/A |
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Growth Media
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