- Primary treatment, Secondary treatment or Biological treatment, BOD (biochemical oxygen demand), activated sludge, anaerobic sludge digesters, biogas,Ganga Action Plan
Shaalaa.com | Microbes In Human Welfare Part 2
Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) it.
Explain the process of sewage water treatment before it can be discharged into natural water bodies. Why is this treatment essential?