Final answer:
The removal of large solids and other objectionable material from wastewater before it reaches pumps or equipment is known as pre-treatment in wastewater treatment plants.
Step-by-step explanation:
The subject of this question is Biology. Specifically, it pertains to the removal of large solids and other objectionable material from wastewater before it reaches pumps or other equipment that it may damage.
This process is known as pre-treatment in wastewater treatment plants. It usually involves the use of a mechanical screen, such as a bar screen, to physically remove large debris and prevent it from causing damage to pumps and equipment.