Question

which of the following steps in wastewater treatment is an example of biotechnology? bar screening is used to separate solid wastes from liquid wastes. chlorine is added to disinfect wastewater before it is released. primary clarifiers allow solids to settle at the bottom of tanks microorganisms are added to feed on solids in the wastewater.

Explanation:

Biotechnology involves using living organisms (like microorganisms) to perform tasks. Bar screening (mechanical separation), chlorine addition (chemical disinfection), and primary clarifiers (physical settling) don't use living organisms. Adding microorganisms to break down solids uses living organisms, fitting biotechnology.

Answer:

Microorganisms are added to feed on solids in the wastewater.