Why do we prefer to call secondary waste water treatment as biological treatment?

Options

A. Vessel
B. Settling tank
C. Clarifler
D. Aeration tank

Answer

D

Explanation

Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/decant mode the other is aerating and filling