Nocardioforme Actinomyceten Gram 1000X
Nocardioforme Actinomyceten Neisser 1000X
Nocardioforme Actinomyceten Lebendpräparat 400X
Nocardioforme Actinomyceten Lebendpräparat 100X
Nocardioforme Actinomyceten Kristallviolett 100X
Nocardioforme Actinomyceten Gram 1000X
Nocardioform Actinomycetes
One of the main causes of scum and foam.
Morphology:
| Filament position: | projecting out of flake or free in aqueous phase |
| Branching: | true branches |
| Movement: | none |
| Growth habit: | bent filaments, antler-like |
| growth: | none |
| Constrictions: | none |
| Sheath: | none |
| Transverse walls: | not identifiable |
| Cell form: | not identifiable |
| Length of filaments: | < 200 µm |
| Filament diameter: | 0.5 – 0.7 µm |
| Gram staining: | positive blue |
| Neisser staining: | mostly negative |
Factors promoting growth:
- high sludge load (0.1 – 0.7 kg BSB5 / kg TS * d), if hydrophobic substances, nonpolar hydrocarbons or surface-active substances are all present
- in presence of easily degradable substrates in inflow they may grow in the low load range (0.07 – 0.15 kg BSB{1>5<1}b / kg TS * d) even without tensides or hydrophobic hydrocarbons
- surface-active substances in inflow
- hydrophobic substrates in inflow (greases, oils and tensides)
- old sludge at tank surface (dead zones and/or impeded surface run-off)
Countermeasures:
- scum drainage and separate scum treatment
- optimisation of fat separation e.g. by addition of PLUSPAC FD 1465 before the ventilated sand and grease trap
- addition of UTOFLOC