Hazen-Adams Model for Developing Algae Treatment Options


  • Ben Stanford - Hazen and Sawyer
  • Craig Adams - Utah State University

The Hazen-Adams model allows utilities to estimate the amount of cyanotoxins that will be removed during oxidation by ozone, permanganate, chlorine, chlorine dioxide, or chloramine at their facility.

A collaborative effort with Hazen and Sawyer, Utah State University, and the American Water Works Association (AWWA) has developed a spreadsheet tool to assess removal of extracellular cyanotoxins by chlorine, ozone, chlorine dioxide, and potassium permanganate.

This calculator reflects the best available information on cyanotoxin oxidation from the peer-reviewed literature. The tool can be used to develop a preliminary assessment of either existing treatment process effectiveness or to consider treatment alternatives.

The calculator is available for free on the AWWA website.

For more information on the other tools we have developed to assist utilities in algae monitoring, please visit our Algae and Cyanotoxins Resources.

For additional information, please contact the co-author at bstanford@hazenandsawyer.com.

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