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MAR-30-2000 16 35 CAMBRIA 510 420 9170 P 02/10 A HIPOxIlm ADVANCED OXIDATION TECHNOLOGIC FOR THE DESTRUCTIVE REMOVAL OF MTBE FROM GROUNDWATER Jacquelin Buratovich-Collins, P E - CDM Engineers & Constructors Inc Reid H Bowman, Ph.D Chemist-Applied Process Technology, Inc, ABSTRACT Pilot tests of Applied Process Technology Inc 's (Applied) line-pressure advanced oxidation process, HIPOx, were completed on groundwater at fuel terminals in Nevada and Southern California. The HiPOx process oxidizes volatile organic chemicals using a combination of ozone and peroxide. Ozone is injected at line pressure of 30 to 40 prig resulting in very rapid and stoichiometric utilization of the ozone in reacting with peroxide to form hydroxyl radicals for the destruction of MTBE Pilot testing provided design parameters and operating costs for full-scale HiPOx system at both sites. As a direct result of the pilot testing, a 30-gpm HiPOx unit was installed and is currently in operation as a wellhead pretreatment of MTBE at an existing remediation system at the Nevada site BACKGROUND MTBE is a gasoline additive used to improve octane ratings and reduce emissions of pollutants into the atmosphere, Recently, MTBE pollution has been discovered to be • widespread in groundwater, even without any mandatory testing requirements for the contaminant Due to the high solubility of MTBE and its potential to rapidly migrate off-site, pump and treat methods for hydraulic control are often required in remedial action schemes In the late 1980s, mobile petroleum products were discovered on the water table at the Nevada site, extending from a petroleum pipeline terminal and railyard area to a gravel pit more than one mile away Dissolved petroleum compounds and chlorinated solvents were also detected in groundwater in the area of the mobile petroleum To protect human health and the quality of the nearby Truckee River, a municipal drinking water supply source, the U.S. Environmental Protection Agency, in conjunction with the Nevada Division of Environmental Protection, issued a removal order requiring cleanup activities at what is now referred to as the Nevada Solvent/Fuel Site (Site) In compliance with the removal order, an investigation was completed and a Removal Action Plan for the Site published in 1992 (Simon Hydro-Search Inc., 1992). The Site is located in the Truckee Meadows, one of the north-trending alluvial-filled bedrock basins in northwestern Nevada, The Truckee River, which originates at Lake Tahoe in the Sierra Nevada Mountains, is the primary surface water feature in the Truckee Meadows and supplies the majority of the drinking water for the Reno metropolitan area Dewatering of a gravel quarry, approximately 1-mile from the term inallrailyard, is the predominant hydraulic r reature affecting me snaiiow groundwater flow in the area of the Site • Page 1