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Primary or secondary treatment

Exercise and reference answers

Items
  1. Item
    Filtering debris
    Category
    Primary
  2. Item
    Settling grit
    Category
    Primary
  3. Item
    Primary sludge
    Category
    Primary
  4. Item
    Aeration tanks
    Category
    Secondary
  5. Item
    Microbial flocs
    Category
    Secondary
  6. Item
    Activated sludge
    Category
    Secondary
Categories
  1. Item
    Primary
  2. Item
    Secondary
Instructions
Tap each step into the stage it belongs to.

Explanation

_Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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