EPA Stage 2 Disinfection Compliance with Aqualog

This application note describes the use of the Aqualog for monitoring regulated Dissolved Organic Matter (DOM) and disinfection by-product issues for drinking water treatment. The Aqualog was used to simultaneously measure the UV-VIS absorbance spectrum and fluorescence excitation emission matrix (EEM) and monitor DOM pertaining to EPA Stage 2 Disinfection By-product Rule (DBPR2) compliance [1] in a typical surface water source drinking water treatment plant (defined as Subpart H) . The method enabled near real-time monitoring of the EPA regulated parameters of Total Dissolved Organic Carbon
(TOC), absorbance at 254 nm (UVA) and the Specific UV Absorbance (SUVA-TOC) as well as the Simulated  Distribution System Trihalomethane (THM) Formation Potential (SDS-THMFP). The parameters were reported as a function of compliance rules associated with required %  removals of TOC (as a function of alkalinity) and predicted  maximum contaminant levels (MCL) of THMs. The single instrument method, which is compatible with continuous flow monitoring or grab sampling, provides a rapid (2-3  minute) and precise indicator of drinking water disinfectant treatability without the need for separate UV photometric
and TOC meter measurements or independent THM determinations.

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