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Successful operation of the activated sludge process relies heavily
on the ability to effectively separate mixed liquor into return
activated sludge (RAS) and a high quality final effluent. Solids
separation efficiency is dictated in large part by the relative
population of floc-forming and filamentous microorganisms present
in the activated sludge. During normal operation, mixed liquor will
be composed primarily of floc-formers with relatively low levels of
filamentous organisms. Some population of filamentous organisms is
necessary to promote the formation of larger flocs and prevent
development of a "pin-floc" condition, which often results in high
effluent turbidities (Jenkins, 2004). However, when conditions
favoring the growth of filaments over floc-formers occur, a
condition commonly referred to as filamentous "bulking" may occur.
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