• Biological & Sustainable
    Enhanced nutrient recovery wastewater treatment solution that outperforms chemical options

  • Modular & Scalable
    Enhanced nutrient recovery wastewater treatment solution designed to grow with customer needs

  • Competitive Economics
    Enhanced nutrient recovery wastewater treatment solution with competitive economics at ENR levels


CLEARAS Advanced Biological Nutrient Recovery (ABNR™) system is a controlled and continuous flow environment that leverages a facility’s existing microbiology – algae and other biological organisms – to recover excess phosphorus, nitrogen and other high-profile contaminants in wastewater.

An extension of the activated sludge process, our patented ABNR system is a bolt-on and modular solution that scales as your needs grow – seamlessly integrating into your existing wastewater treatment infrastructure.

To learn more about the ABNR™ process, view our overview video.

  • Phosphorus and Nitrogen Recovery to Near Non-Detect Levels
  • Multi-constituent Remediation
  • Competitive Total Cost of Ownership
  • Modular and Scalable Design
  • Sustainable, Biological and Chemical-free

How It Performs

Achieving lower levels than any other solutions, CLEARAS ABNR™ recovers both phosphorus and nitrogen to near non-detect levels from influent to effluent for our municipal and industrial clients.

About Clearas

Founded in 2008, CLEARAS Water Recovery is a team of engineers, innovators and problem solvers experienced in both startup and Fortune 500 companies. We design, build, and operate next-generation ABNR solutions that deliver the highest quality wastewater treatment to our partner-clients at the lowest total cost of ownership. We are dedicated to ensuring that our partner-clients succeed, and are backed by a network of strategic advisers that provide expertise in engineering, biological processes, and systems management.

News / Resources

  • Recent News

    Beaver Dam has agreed to reduce the phosphorous output of its wastewater plant through new technology, settling a three-year dispute with the Wisconsin Department of Natural Resources. Last week, the Common Council approved spending up to $50,000 on a facility study to help reduce phosphorous flowing into the Beaver Dam River. They also approved a letter of intent to work with Clearas Water Recovery based in Missoula, Montana. Follow the link to read more...
  • Upcoming Event

    Tuesday, February 6, 2018 to Wednesday, February 7, 2018
  • Industry Article

    Clearas is featured in the Summer, 2016 edition of Influents, the official publication of the Water Environment Association of Ontario. The article, which appears on pages 61-63, and is titled Nutrient Reduction Through Use of an Advanced Biological Nutrient Recovery Process, describes how the...