Secondary sewage treatment is mainly due to
Correct answer: B. Biological processes
- A. Mechanical processes
- B. Biological processes
- C. Physical processes
- D. Chemical processes
Explanation
This is usually done with the help of microorganisms(bacteria), hence it is called biological treatment. The microorganisms feed on the organic matter present in the wastewater thereby reducing the organic load of the wastewater and purifying the water.
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