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Project #4622

Understanding the Source and Fate of Polymer-Derived Nitrosamine Precursors

$531,456
Completed
Principal Investigator
Paul
Westerhoff
Research Manager
Dr. Djanette Khiari
Contractor
Arizona State University
Disinfection Byproducts (DBPs)
Advanced Treatment
Emerging Disinfection Byproducts
Treatment
Final Report

Abstract

This project investigated how cationic polymers contribute to NDMA formation, and identified actionable information that water agencies can implement to reduce cationic polymer-derived NDMA formation. The project focused primarily on polyDADMAC, because it is the most commonly used cationic polymer to improve coagulation, particle settling, and filterability at U.S. drinking water facilities. Polyamine, used by fewer utilities, can also form NDMA, and was a secondary research focus. Published in 2019.