Operator drill: Primary treatment

10 questions · Untimed · Every option explained

Wastewater characteristics, bar screens, grit removal, primary clarifiers, scum, sludge pumping and flow equalization. Ten questions from our primary treatment bank, with an explanation for every option.

Line drawing of a wastewater headworks with a mechanical bar screen lifting rags from a channel, a screenings bin and an aerated grit chamber with a grit screw

Before you start

Most questions have four options and one best answer; true/false questions have two.
Check each answer to see why every option is right or wrong before moving on. Checked answers cannot be changed.

Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.