Operator terms · Wastewater
What is grit removal?
Grit removal takes out the heavy sand, gravel, and small dense particles that come in with wastewater, early in preliminary treatment. Removing grit protects pumps and equipment from wear and keeps it from settling in tanks downstream. It is separated by slowing the flow so only the heavy grit drops out.
Last reviewed 2026-08-03
Why it comes first
Grit is abrasive and heavy. Taking it out early, in preliminary treatment, protects pumps and mechanical parts and stops it from filling up tanks later.
How it is separated
The flow is slowed just enough that dense grit settles while lighter organic solids stay suspended and carry on to treatment.
Common questions
- Why remove grit?
- It is abrasive and would wear pumps and equipment and settle in tanks.
- When is grit removed?
- Early, in preliminary treatment.
- How is grit separated?
- By slowing the flow so heavy grit settles and lighter solids move on.