Flocs' refer to

Options

A. Masses of bacteria associated with fungal filaments to form a mesh-like structure
B. Primary sludge formed in the ETP
C. The remaining part of the sludge
D. ‘Biogases’ formed from the fermentation of organic wastes

Answer

A

Explanation

The primary effluent formed is passed into large aeration tank cohere it is constantly agitated mechanically and the air is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form a mesh-like structure). These microbes consume the major part of the organic matter in the effluent.