Treatment of 1,4-Dioxane in Stockton, CA

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In the early 1990’s, the volatile organic compounds (VOCs) tetrachloroethylene (PCE) and trichloroethylene (TCE) were discovered in the vicinity of several city water supply wells near the city of Stockton, California. An aggressive, hydraulic containment/water reinjection system was installed to contain the plume and protect the quality of the drinking water. For several years, a treatment system consisting of granular-activated carbon and air stripping was used to remove VOCs from the reinjected water.

Recently, however, the contaminant 1,4-dioxane was also discovered in the plume. 1,4-Dioxane is commonly used as a stabilizer in chlorinated solvents, and therefore, is often present in VOC plumes. In particular, 1,4-dioxane contamination is commonly found at sites contaminated with 1,1,1-trichloroethane (TCA), a solvent that contains up to 15% 1,4-dioxane.

A semi-volatile contaminant with low volatility and low affinity for carbon materials, 1,4-dioxane resists removal from water by carbon or air stripping. The consulting engineer for the project, Dudek and Associates, Inc., contacted Trojan Technologies for a treatment solution to remove this emerging contaminant. Trojan worked closely with the engineers to provide an optimized, low-energy ultraviolet light (UV) advanced oxidation system to destroy the 1,4-dioxane.

The Trojan Solution

Trojan provided a pressurized, multi-lamp TrojanUVPhox™ reactor system to treat the 1,4-dioxane by UV-oxidation, a process that combines UV light and hydrogen peroxide. To optimize the UV treatment system during the design phase, Trojan performed testing on groundwater collected at the site to determine its water quality parameters. The resulting TrojanUVPhox™ system, including UV reactor and hydrogen peroxide delivery system, was installed in the summer of 2001. That system is currently operating at full capacity.

Trojan, through its subsidiary US Peroxide, delivers hydrogen peroxide to the site in Stockton. Tank levels are monitored remotely and deliveries are sheduled according to need. The 1,100 gallon storage tank and twin metering pumps (one primary, one back-up) deliver peroxide to the water stream.

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