Impact of GAC Treatment and Disinfection Strategy on DBP Formation and Overall Toxicity in Drinking Water
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Associated Project
Project 5140: The Impact of Pre-Chlorination and GAC Treatment on DBP Formation and Overall Toxicity in Drinking WaterWater systems that cannot meet U.S. Environmental Protection Agency (EPA) Stage 1 and 2 Disinfectants and Disinfection Byproducts Rules (D/DBPRs) requirements through lower-cost options (like enhanced coagulation, softening, or pH optimization) may need additional treatment. While granular activated carbon (GAC) is effective at removing total organic carbon—the main precursor for disinfection byproducts (DBPs)—it can also shift DBP formation toward more toxic species, even as it reduces overall DBP mass.
The Water Research Foundation (WRF) project 5140, Impact of GAC Treatment and Disinfection Strategy on DBP Formation and Overall Toxicity in Drinking Water, builds on WRF project 4560, GAC Control of Regulated and Emerging DBPs of Health Concern, to evaluate the impact of GAC treatment with and without prechlorination on DBP formation and the corresponding toxicity in drinking water.
Join us for a webcast on this research where presenters will discuss:
- A new approach for evaluating cytotoxicity from both known (regulated and unregulated) and unknown DBPs.
- The impact of GAC treatment, with and without prechlorination, on DBP formation and toxicity, including effectiveness even at higher total organic carbon breakthrough.
- Why GAC followed by chlorination is a more reliable strategy than free chlorine followed by chloramines for reducing DBP-associated toxicity while maintaining compliance.
- How high-throughput toxicogenomics assays can be applied to assess DNA and oxidative stress under different treatment and disinfection conditions.
- How these findings on DBP toxicity are relevant to the EPA’s ongoing review of the Microbial and Disinfection Byproduct Rules (M/DBPRs).