Due to increased environmental regulations on total residual oxidant (TRO), a power plant in the Southeastern United States was searching for a better online process analyzer to monitor TRO in cooling water and wastewater discharge. This power plant uses sodium hypochlorite as biocide to control biological growth in cooling tower. With abundant natural organic matter and trace ammonia in the water, free chlorine generated from sodium hypochlorite converts to chloramines, trihalomethanes (THMs), and haloacetic acids (HAAs). TRO represents all oxidant species including free chlorine, chloramine, and hypochlorite (even bromine and chlorine dioxide for sites that uses these biocides).
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