Rectangular Clarifier – Envirex® Chain & Scraper


Evoqua – Rectangular Clarifier – Envirex® Chain & Scraper system provides maximum sludge concentrations and floating solid removal. The system is comprised of light-weight components, which makes installation easy and simplifies maintenance.  Flights mounted on two parallel strands of metallic or non-metallic chain scrape the settled solids along the tank floor to sludge hoppers. On the return run, the flights can skim the surface and concentrate the floating material at a scum removal device. Applications include:

  • Water Treatment Plants
    • Chemical sludge removal
    • Pre-sedimentation
  • Wastewater Treatment Plants
    • Primary & secondary clarification
    • DAF thickeners
  • Industrial Treatment
    • Clarification
    • Oil/water separation




Video: Rehab Solutions

Technical Sales Manager, Dennis Kaiser, describes Evoqua’s retrofit/rehab solutions for chain and scrapers, including several new components designed for easy installation, replacement and long life.


Chain and Scraper Components


  • Channel Flights
  • Sigma Plus Flights
  • Diamond Flights
  • Flight Extensions

Collector Chains and Tools

Drive Chains



  • Metallic and Non-Metallic FRP Headshafts
  • Full Tank Width Shafts (live or static)
  • Stub Shafts


Return tracks and supports

Wear Items

  • Wear Strips – UHMW Polyethylene
    • Standard with convex washers
    • Floor – C-Style Wear Strip (optional)
    • Return Tracks – C-Style Wear Strip (optional)
  • Wear Shoes – UHMW Polyethylene (optional polyurethane)

Cross collectors

  • Chain and Flight
  • Screw Conveyor
    • Torque Tube Drive
    • Chain Drive

Scum Skimming

  • Scum Pipes
    • Lever Operated – Manual
    • Worm Gear – Manual or Motorized
    • Rack and Pinion – Manual or Motorized
  • Power Skimmers – with or without Steel Trough
  • Helical Skimmers – with or without Steel Trough
  • Surface Skimmers

System Monitoring

  • Flight and Sprocket Monitoring

Product Assistance

Please describe the products or service needs in the short form below and our technical assistants will work closely with you to ensure you have all necessary parts shipped instantly. You can also call our experts at 800-366-7867.

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