CA water purification project installs online THM instrument for chlorine monitoring

Oct. 9, 2015
Padre Dam Municipal Water District has installed the THM-100 online trihalomethane monitor from Aqua Metrology Systems to provide real-time data and a various of benefits for the utility.

Oct. 9, 2015 -- Padre Dam Municipal Water District in Santee, Calif., has installed the THM-100 online trihalomethane (THM) monitor from Aqua Metrology Systems (AMS), a provider of online and offline analytical instrumentation for the detection of water contaminants, to provide real-time data on disinfection byproduct (DBP) formation, aid the utility in evaluating its innovative free chlorine disinfection strategy, and ensure the safety of potable reuse water being used produced at its Advanced Water Purification Demonstration Project (AWPDP).

Padre Dam imports 100 percent of its drinking water supply from the Sacramento Bay Delta and Colorado River. Drought conditions and imported water supply challenges have highlighted the need for Padre Dam to explore new possible water sources capable of ensuring a safe and reliable drinking water supply. As a result, the AWPDP began operations in April 2015 at the Roy Stover Water Recycling Facility to evaluate the treatment strategy needed to meet the requirements for potable reuse from recycled water. Once full-scale, it will provide 2,000 to 3,000 acre feet per year -- 20 to 25 percent of Padre Dams drinking water.

The AWPDP, using a 100,000-gallon-per-day pilot facility, includes the feasibility testing of the addition of free chlorine, ultrafiltration, reverse osmosis, and advanced oxidation. Free chlorine is a unique application for water recycling facilities and, as such, it is important to test and verify the quality of the potable reuse water created through advanced treatment. The THM-100 monitor is being used to demonstrate the free chlorine strategy and its ability to provide high-quality potable reuse water while limiting the formation of harmful DBPs.

"The THM-100 online monitor provides us with immediate and accurate daily reports on THM levels. Monitoring the real-time formation of THMs helps us to ensure we are meeting the pathogen removal requirements for potable reuse," said Al Lau, Director of Engineering, Padre Dam Municipal Water District. "The online monitor continuously measures the THM levels of the permeate water from the reverse osmosis system. Manually collected samples are analyzed alongside the samples taken automatically by the monitor in its online mode."

See also:

"CA district breaks ground on advanced water purification demonstration project"

"AZ wastewater reclamation department improves THM monitoring with online THM analyzer"

About AMS

Aqua Metrology Systems Ltd. is a provider of online and offline analytical instrumentation for the detection of water contaminants, specifically disinfection by-products and trace metals, across municipal and industrial sectors. The company believes that high-frequency data is essential for effective process control and optimization. As a result, its technical solutions are designed to provide reliable and repeatable information on water quality contaminants through continuous, real-time monitoring. For more information, visit


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