Multiple choice

How much percentage of water is present in an activated sludge?

  1. 90

  2. 97

  3. 95

  4. 99

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Activated sludge typically contains about 97% water, with the remaining 3% being suspended solids and microorganisms. This high water content is characteristic of the biological flocculent material formed during the aeration stage of wastewater treatment.