Municipal & Industrial wastewater treatment plants generally use mechanical screening as the first step in the wastewater treatment process (pretreatment), Mechanical screens remove larger solids from wastewater in order to protect the equipment in the treatment stages that follow.
The type of screen most suitable for a particular application relates specifically to the size and type of solids in the wastewater. For example, sticky solids may require the use of a drum screen, while larger solids may just require a standard screw screen.