NEET2011ZoologyMicrobes in Human WelfareActual
Secondary sewage treatment is mainly a
Options
- Amechanical process
- Bchemical process
- Cbiological process
- Dphysical process
Correct answer
C. biological process
Step-by-step solution
In secondary or biological treatment of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of organic matter occurs by one of the three methods-water hyacinth pod, trickling filter method and activated sludge method. After decomposition the treated water is sterilized through chlorination.