Sponsor Area

Microbes In Human Welfare

Question
CBSEENBI12002478

Secondary sewage treatment is mainly a 

  • mechanical process

  • chemical process

  • biological process

  • physical process

Solution

C.

biological process

In secondary or biologicial treatement of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of oragnic 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.