Reference Library

Potential cause: High SRT

High Sludge Retention Time (SRT) Values: SRT is a calculation of the theoretical time the average microbe remains in a biological wastewater treatment process. There are two recognized filamentous bacteria morphotypes that are correlated with elevated SRT values. Note that low food to microorganism ratio (low F/M) often but does not always accompany high SRT.

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Tetrads

Diameter:
N/A
Dimensions
N/A
Tetrads Cropped 1000x phase Contrast
Tetrads Cropped 1000x phase Contrast
Shape:
N/A
Septa:
N/A
Sulfur Granules:
N/A
Sheath:
N/A
Branching:
N/A

Description

Groupings of four cell clustered together. Associated with organic acid substrate, commonly favoring higher SRT (sludge retention time) values.

Type 1851 Filament Morphotype

Diameter:
.8-1 µm
Dimensions
0.8 x 1.4 µm
type 1851-like filaments cropped from 1000x phase contrast
type 1851-like filaments cropped from 1000x phase contrast
Shape:
Rectangles
Septa:
Yes - often difficult to see
Sulfur Granules:
No
Sheath:
Yes
Branching:
Yes

Description

Often forms "bundles/twisted ropes". Often has attached growth.

Filament Type 0041/0675 Morphotype

Diameter:
1.0-2.2 µm
Dimensions
1.0-2.0 x 2.0-3.0 µm
Shape:
Square
Septa:
Yes - Visible
Sulfur Granules:
No
Sheath:
Yes
Branching:
Yes

Description

“Grainy” appearance. Often has attached growth.

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Ryan Hennessy Wastewater Microbiology
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