Examples of sludges with good settling properties
(click to get higher resolution image):
Examples of bulking sludge
(click to get higher resolution image):
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Bulking |
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Bulking
of activated sludge is usually caused by an excessive growth of
filamentous bacteria. These bacteria belong to the normal sludge
population. They have to compete with the flocforming bacteria for the
nutrients supplied with the influent. However, the size of the filamentous
population will strongly increase if the filamentous species can consume a
large portion of the available substrate. Bulking sludge occurs if the
Sludge Volume Index exceeds the value of 150 ml/g. Bulking will result in
a deterioration of the settling and the dewatering characteristics of
activated sludge. Since 1975, many successful bulking sludge control
methods and strategies have been developed |
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Examples of sludges with good settling properties (click to get higher resolution image): |
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Examples of bulking sludge (click to get higher resolution image): |
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