Determination of Free Available Chlorine in Denitrified Wastewater Effluent
2006
Matta, Richard L.
The DPD and amperometric methods for determining free available chlorine were compared in a study of chlorine demand in a denitrified (unchlorinated) wastewater. The DPD method was found to be more precise than the amperometric method. Chlorine demand of denitrified wastewater from the Kanapaha Water Reclamation Facility (KWRF) was found to increase with increase in chlorine dose. Total chlorine demand was found to increase with time when dose was constant. These results support previous work at the KWRF which found increased chlorine demand with chlorine dose. Synthetic (laboratory prepared) water was spiked with ammonium chloride at various concentrations to determine the effect of chloramines on the free chlorine measurement. The interference of chloramines, particularly monochloramine, on the free available chlorine residual measurements made using the DPD method was significant. The amperometric method showed no such interference.
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