Grit Removal Practice Questions for Level 4 · Expert

1. Question 1

   After an impeller replacement, a vortex grit unit runs above its specified rotation range. Grit capture falls, but organic content in the collected grit also falls. Downstream channel deposits increase. Which plan best restores performance without trading one problem for another?

   1. Increase grit-pump time and leave rotation unchanged
   2. Slow the unit below range to maximize settling
   3. Increase wash water until downstream deposits fall
   4. Return to range and verify both outputs
   Show the answer

   Answer: D. Return to range and verify both outputs

   Returning to the designed operating range addresses the changed separation conditions, while paired checks confirm that capture improves without excessive organics.

2. Question 2

   Grit carryover rises during wet weather. The vortex unit holds its target water level, but the inlet channel velocity doubles and the grit pump removes mostly organic material. A second channel can split peak flow. Which trial best tests the hydraulic cause?

   1. Split peak flow and compare grit capture and organics
   2. Run the grit pump continuously through the storm
   3. Lower the vortex water level below its operating range
   4. Increase wash water until the removed material is clean
   Show the answer

   Answer: A. Split peak flow and compare grit capture and organics

Operator Master has 2 Level 4 · Expert grit removal questions, free.

• Plant Operations35 questions
• Solids Handling11 questions
• Biological Treatment9 questions
• Disinfection7 questions
• Laboratory7 questions
• Math and Calculations5 questions
• Pumps and Hydraulics5 questions
• Safety4 questions
• Secondary Clarification3 questions
• Headworks and Screening2 questions
• Primary Treatment2 questions
• Regulations and Compliance2 questions