MediumBotanySewage treatment
+4 / -1
What are flocs?
A
Masses of anaerobic bacteria
B
Masses of aerobic fungi and anaerobic bacteria
C
Masses of anaerobic bacteria and fungi
D
Masses of aerobic bacteria associated with fungal filaments
Explanation
Secondary treatment or Biological treatment: The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments) to form mesh like structures. While growing, these microbes consume the major part of the organic matter in the effluent. This significantly reduces the BOD (biochemical oxygen demand) of the effluent.
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