Sphaerotilus natans Gram 1000x
Sphaerotilus natans Lebendpräparat 100X
Sphaerotilus natans Lebendpräparat 400X
Sphaerotilus natans Lebendpräparat 400X
Sphaerotilus natans
Sewage fungus occurs in running water with heavy organic loads and in heavily loaded wastewater treatment plants for the food, paper and petrochemical industries. Very rare in municipal sewage plants with nutrient elimination. If present in large numbers it is very ISV-relevant.
Morphology:
| Filament position: | projecting out of flake |
| Branching: | untrue |
| Movement: | none |
| Growth habit: | straight / slightly curved |
| Aufwuchs: | absent |
| Constrictions: | clearly visible |
| Sheath: | present |
| Transverse walls: | visible |
| Cell form: | rod-shaped |
| Length of filaments: | > 200 µm |
| Filament diameter: | 1.0 – 1.5 µm |
| Gram staining: | negative |
| Neisser staining: | negative |
Factors promoting growth:
- high concentrations of easily degradable carbohydrates, fatty acids or alcohol (e.g. agribusiness), decaying sewage
- impact load with organic substance
- lack of oxygen
- high C/N/P ratio
- fully mixed activation tanks
- sludge load > 0.15 kg BSB5 / kg TS * d
Countermeasures:
- reduction of sludge load
- improvement of oxygen supply and eradication of N and P deficit
- addition of FeCl3 and FeSO4