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Water Pollution MCQ App Download & e-Book - 47

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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 MCQ App (iOS & Android)

Water Pollution MCQ App

Water Pollution MCQ App (Android & iOS)

10th Grade Chemistry MCQ App

A level Chemistry MCQ App (Android & iOS)

A level Chemistry MCQ App

9th Grade Chemistry MCQ App (Android & iOS)

9th Grade Chemistry MCQ App