Source Water Monitoring Improves Process Control

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Background

UV254 provides one of the best indicators of a waters potential to form disinfection by-products (DBPs) and should be monitored at treatment plants that are susceptible to elevated concentrations of organic matter in raw water. This is due to the fact that most naturally occurring organic matter (NOM), such as humic substances that are aromatic in nature, absorb strongly at 254 nm. These reactive organic compounds are known to be a major precursor of DBPs such as trihalomethanes (THMs) and halo acetic acids (HAAs). Organic concentration, specifically in surface water, can change quickly posing challenges for treatment plants. Implementing a source water monitoring strategy that includes UV254 has enabled many plants across Ireland to detect raw water organics events rapidly, optimize treatment processes and protect public health from DBPs.

Moving from Grab Sampling to Real-Time Analysis

Prior to installation of Real Tech’s UV254 analyzers, many of the drinking water plants measured turbidity and colour with supplemental grab sampling for organics in raw water. Rapid changes are often not captured or assessed adequately with grab sampling, therefore continuous organics monitoring that would produce data at a greater frequency was essential. The UV254 analyzers provide various benefits to the treatment plants including raw water event monitoring and aiding with control of the coagulation process to enhance or optimize organics removal. Reducing the concentration of organics helps to limit DBP formation and increases disinfection efficiency, particularly for UV disinfection systems. In addition to event detection and improving plant efficiencies, UV254 data is also collected from numerous facilities across Ireland to observe and capture longer term trends in raw water organics concentration that will allow the utilities to anticipate and plan for future treatment needs.

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