Wednesday 8:30 AM
[Presentation PDF]

Room: Sapphire

Controlling Cyanotoxins by Oxidation Processes: Mechanisms, Kinetics and Implications for Water Treatment

Cyanobacteria (blue-green algae) are ubiquitous in many surfaces waters used for drinking water resources. A few genera of cyanobacteria can produce several kinds of toxins called cyanotoxins. Several countries have set drinking water standards for cyanotoxins. While conventional water treatment processes are effective for removal of cyanobacteria cells, they are ineffective for removal of extracellular cyanotoxins. Oxidation processes provide an option to remove those dissolved forms of cyanotoxins. The objectives of this presentation are (1) to discuss the effectiveness of water treatment oxidants on several types of cyanotoxins, and (2) consequently, to suggest a general guideline for water utilities to select treatment chemicals for controlling cyanotoxins. Oxidants included in the presentation are chlorine, chloramine, chlorine dioxide, permanganate and ozone. Oxidation mechanisms, reaction kinetics and the impact of operating parameters such as pH and temperature on the oxidation processes will be included in the presentation.

Moderator:  Brian Hackman


Amos Au - Carus Corporation

Dr. Amos Au is the Water Technology Development Manager with Carus Corporation.  He received his Ph.D. degree in Environmental Engineering from The Johns Hopkins University. He has more than 20 years of experience in water and wastewater treatment processes, particularly in oxidation, coagulation, filtration and disinfection processes.  

He serves as a member in several AWWA committees.