Question

What is sludge? Explain how itis treated.

Answer 1

Explanation:

consisting of parts that are positioned together closely or in a tidy way, using very little space:

compact soil/sand

a compact camera/bag

Answer 2

Answer:

Semi-solid wastes like feces that settle down at the bottom during wastewatertreatment are called sludge. Thesludge is removed using a scrapper and then transferred to a separate tank where it is decomposed by the anaerobic bacteria to produce biogas. This biogas is used as fuel for cooking, heating, etc.