• Simple, chemical-free nutrient recovery
    CLEARAS Water Recovery delivers leading-edge biological wastewater treatment solutions that cost-effectively transform waste to value.

  • Cost-effectively meet regulation
    The Advanced Biological Nutrient Recovery (ABNR) system achieves ultra low-level nutrient results for best-in-class water recovery.

  • Reliable and proven
    The Advanced Biological Nutrient Recovery (ABNR) system has been proven in 45+ pilots across the U.S. with full scale commercial installation underway at the 4,000,000 gallon per day South Davis Sewer District

News & Resources

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    Find out more about Clearas Water

  • Roberts, WI - Case Study

    The Village of Roberts has decided to move forward with a full-scale installation of Advanced Biological Nutrient Recovery. In this case study, we will discuss the evaluation and implementation process.
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    Thursday, August 23, 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...


CLEARAS Advanced Biological Nutrient Recovery (ABNR™) system is a chemical-free and biologically-based wastewater treatment technology for municipal and industrial point source dischargers. The proprietary technology leverages a zero-waste process to effectively remove nitrogen, phosphorus and other harmful nutrients – converting these assets to maximize cost recovery for our customers.

The ABNR system is very similar to the well-known activated sludge process in the sense that it takes advantage of aerobic micro-organisms but an activated algae stream is returned back into the cycle to continue the systems’ process. This eliminates the need for chemical addition and reduces hauling costs. The system incorporates a flexible and modular/scalable design to seamlessly integrate 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 ultra low-level nutrient results, CLEARAS ABNR™ recovers phosphorus, nitrogen and other constituents to near non-detect levels from influent to effluent for our municipal and industrial clients.

About Clearas

Founded in 2008, CLEARAS Water Recovery provides leading-edge natural wastewater treatment solutions that transform waste into value – delivering unique cost recovery opportunities for our customers. Our team of engineers, innovators and problem solvers are experienced in both startup and Fortune 500 companies. We design, build, and operate our next-generation Advanced Biological Nutrient Recovery (ABNR) solutions that deliver simple and chemical-free biological wastewater treatment solutions that achieve ultra low-level nutrient results for best-in-class water quality 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.