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Thursday, September 15 • 11:30am - 12:15pm
Corrosion Control - Real-time Monitoring and Optimization

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In April of 2014 the Central Utah Water Conservancy District’s Don A. Christiansen Regional WTP converted from a direct filtration plant to a conventional plant and switched from using Alum as its primary coagulant to Ferric Chloride. Due to the change in coagulant, and the ability to feed more coagulant in order to practice enhanced coagulation, the ability to adjust pH became necessary. - The plant’s raw water source is from a river that experiences large diurnal pH swings that make consistent control of saturation index difficult. Because of this, the Plant has taken a proactive and unique approach to pH adjustment and corrosion control. Saturation index is calculated in real-time by SCADA which provides a target pH for the Plant’s finished water. Sodium Hydroxide is fed to achieve a target pH based on a desired saturation index value and is controlled on a continuous basis via PID loop. Integrating saturation index into SCADA allows minute-to-minute tracking and alarming so that the operator is keenly aware of current values and trends. Also, benchtop testing was performed to validate the SI calculation and to determine the optimum SI setpoint.


Thursday September 15, 2016 11:30am - 12:15pm MDT
Entrada C

Attendees (6)