Type 1863

Mainly found in municipal sewage plants with a high sludge load. There are a few organisms that are morphologically similar but physiologically different to Type 1863. Type 1863 has no influence on the sludge volume index, but can cause foam.

Morphology

Filament position:	on the flake or free in the water
Branching:	none
Movement:	none
Growth habit:	curved to irregularly wound
Aufwuchs:	absent
Constrictions:	clearly identifiable
Sheath:	absent
Transverse walls:	clearly identifiable
Cell form:	spherical or oval
Length of filaments:	< 150 µm
Filament diameter:	0.5 – 0.8 µm
Gram staining:	negative
Neisser staining:	negative

Factors promoting growth:

high sludge load > 0.2 kg BSB₅/ kg TS * d
insufficient oxygen supply

Countermeasures:

reducing the sludge load
addition of ferrous precipitants (FERRACLAR CLASSIC, FERRAPLUS, FERRAL FD 1600, Contisolf, Contisolf Winter)

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