7ae5a085_Lesson_8__Filamentous_Bacteria__Effect_of_Problem
[Name of Problem] Rising sludge [Cause of Problem] Denitrification in secondary clarifer releases poorly soluble N2 gas, which attaches to activated sludge flocs and floats them to the secondary clarifier surface. [Effect of Problem] 
A scum of activated sludge forms on the surface of the secondary clarifier.
Lesson 8: Filamentous Bacteria
Effect of Problem