Installation of a rebuilt 120 ft. Secondary Circular Clarifier with riser pipes

Clarifier Rebuilds and Retrofits

Rebuild and replace clarifier internals for long term performance

Rebuild and replace clarifier internals for long term performance

Application or technical questions?

Ask a Monroe Expert
Request Quote

If you plan to rebuild or retrofit a water or wastewater treatment clarifier, call Monroe Environmental. We specialize in the repair, retrofit, replacement and general upgrading of clarifiers. We recognize that up-time is critical; we’ve replaced whole systems in as little as 3 days — from empty tank to new internals installed and operating.

Why Rebuild or Retrofit Existing Clarifiers?

Rebuilding and replacing the internals of a concrete or steel tank clarifier is a quick, cost-effective solution versus constructing an entirely new system. The clarifier tanks often maintain a suitable operating condition while the skimmer arm, center well, drive assembly, and sludge rakes corrode and wear beyond an acceptable level.

The benefits of a Monroe Environmental Clarifier Rebuild are straightforward and simple:

  • Faster installations & reduced total cost
  • Minimal clarifier downtime
  • Improved performance  
  • Reduced future maintenance costs

These benefits are realized because we are often able to fully assemble clarifier equipment before it ships to the job site. In such a case, we inspect and test every bolt, weld, and panel to make sure that each component fits together perfectly before it is shipped to site and installed. This key step can be the difference between a few days of simple installation or weeks of fitting, engineering, and re-working equipment in the field. By reducing installation time, projects can often be completed ahead of schedule with minimal labor cost.

Circular Clarifier rebuild installation

Rebuild of a Secondary Clarifier for municipal wastewater treatment

Call or e-mail us and one of our Application Engineers will contact you to review the details.

Clarifier Rebuild Examples

Circular Clarifier: Chemical Manufacturing Plant

Condition of Clarifier before rebuild
Condition of Clarifier before rebuild
Condition of Clarifier before rebuild

Before: Existing 55 ft. diameter Scraper Clarifier at chemical manufacturing plant. Middle photo: New Clarifier internals completely assembled in Monroe shop. After: Installation of new internals as well as drive, bridge, and walkway.

Primary Clarifier: Municipal Wastewater Treatment

Primary Clarifier before rebuild
Condition of sludge rakes before rebuild
Rebuilt Primary Clarifier with new spiral scrapers ready to return to operation

Before (Photos 1 & 2): Upgrade of four 250 ft. Primary Clarifiers. The project included converting the sludge rakes to higher efficiency spiral scrapers and rehabilitating existing drive units, as well as replacing influent wells, column supports, weirs, baffles, and launders with a combination of mild, coated steel and non-corrosive stainless steel members. After (Photo 3): One of the Primary Clarifiers ready to return to operation.

Vertical Clarifier: Plating Company

Vertical Clarifier for plating company before rebuild
Condition of Vertical Clarifier before rebuild
Refurbished Vertical Clarifier ready to leave Monroe facility

Before (Photos 1 & 2): Vertical Clarifier rebuild for a plating company. After (Photo 3): Refurbished Vertical Clarifier leaving Monroe facility.

Secondary Clarifier: Municipal Wastewater Treatment

Assembly of 130 ft. clarifier rakes
Installation of Secondary Clarifier internals
Secondary Clarifier after rebuild

Before (Photo 1): Secondary Clarifier 130 ft. Clarifier rakes fully assembled in Monroe shop prior to shipment. Photo 2: Installation of rebuilt components at a 25 MGD WWTP. After (Photo 3): Secondary Clarifier ready to return to operation after just a three day installation.

Clarifier Rebuild Services

Resources & Literature

Recent Case Studies

Newsletter Subscription

Stay informed about air pollution control and water/wastewater treatment applications and solutions from Monroe Environmental. Subscribe to our newsletter.

Quality Standards