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Water Pollution Quiz App Free Download & e-Book - 47

MCQ: 47

Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called

  1. primary sewage treatment
  2. secondary sewage treatment
  3. activated sludge treatment
  4. chlorination

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Water Pollution App (Android & iOS)

Water Pollution App (Android & iOS)

10th Grade Chemistry App (Android & iOS)

10th Grade Chemistry App (iOS & Android)

College Chemistry App (Android & iOS)

College Chemistry App (Android & iOS)

O Level Chemistry App (Android & iOS)

O Level Chemistry App (iOS & Android)