Multiple choice

Dried ______ is used as manure

  1. Sludge

  2. Waste water

  3. Bacteria

  4. Algae

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

Sludge is a semi-solid slurry and can be produced as sewage sludge from wastewater treatment processes or as a settled suspension obtained from conventional drinking water treatment and numerous other industrial processes.