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Secondary sewage treatment is mainly a
Option: 1
Chemical process
Option: 2
Biological process
Option: 3
Physical process
Option: 4
Mechanical process
Answers (1)
- The primary effluent is passed into large aeration tanks where 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 mesh-like structures).
- While growing, these microbes consume the major part of the organic matter in the effluent.
- Hence, the correct option is (b).
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