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Jenfitch, LLC Announces JC 9450 ROS, a pre-coagulant aid, lowered TTHM's and HAA5's in Surface Water Treatment Systems
Walnut Creek, CA –November 5,- Jenfitch, LLC recently completed a 90 days study with a 10 mgd surface water treatment plant in Northern California. The goal of this was study was to evaluate the effects of using a new liquid oxygen-based pre-oxidant, JC 9450 ROS.
In April 2014, the management of a water treatment plant speculated that the organic loading from their shallow surface reservoir during the Summer months would be high and requiring constant monitoring of geosmin and 2-MIB. They had the option of using sodium hypochlorite as a pre-oxidant at 0.5 mg/l as free chlorine residual.They also had available ozone available in front of their filters.Their primary disinfectant was chloramine.Overall water quality was good with the exception of Total Organic Carbon (TOC) which was averaging between 3.8 mg/l to 6.6 mg/l and bromide (averaging 230 ppb to 320 ppb).Because the plant's goal was to maintain an ozone residual of 0.10 mg/l to 0.15 mg/l, they had to operate the ozone generators at 95% of rated capacity.The results were, during the Month of April, they had a bromate spike up to 18.0 ppb. They looked at increasing the dosage of sodium hypochlorite to lower the ozone demand in the settling basin. In the winter without sodium hypochlorite as a pre-oxidant, the plant' TTHM were averaging around 12 ppb. Using sodium hypochlorite and achieving a free chlorine residual of 0.5 mg/l, the TTHM's were in the 20ppb to 25ppb and climbing. The weirs going from the clarifier to the filters had a heavy thick biofilm that indicated the 0.5 mg/l chlorine residual was effective.
After several bench studies, the plant management decided to test a new liquid oxygen-based disinfectant, JC 9450 ROS, as a pre-coagulant aid. Within 48 hours, the operating condition improved. The Settled Water turbidity went from 0.44 NTU to 0.22 NTU. The UvA 254 in the Settled Water went from 0.046 to 0.028. We measured the TOC in the effluent, it went from 2.2 mg/l to 1.7 mg/l. After several weeks, the dosage was dropped by 50%. After a month, the dosage was again lowered. During this period, the neighboring water treatment plants on the same source water had Taste & Odor (T&O) complaints. Last year, this plant had over 15 complaints for T&O in July alone. This year, from July through November, they had no T&O complaints. The finish water TOC was less than 1.2 mg/l. TTHMs dropped to less than 9.0µl and HAA5s dropped to less than 1.0µl. The plate counts (HPC) in the Settling Basin went from greater than 100 CFU to non-detect during this study. This pre-treatment lowered the ozone demand in the system and lowered the total amount of chlorine used in the finish water to achieve 1.5 mg/l chlorine residual in the clearwell.
If you would like a complete report or more information on JC 9450 ROS, please call 925-289-3559 ext 102 or email: [email protected].
