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Worcester' ` . . - <br /> C11 <br /> Telephone: (MEI) 74CF-5280L Facsimile: (SUE[) 3C[Z-4694- <br /> CASE STUDY: CUSTOM-BUILT OZONE NJECTION SYSTEM <br /> Background <br /> An ARCE Systems ozone spargzng system,was recently installed <br /> at a site in Central California. This custom designed umt was <br /> constructed to deliver 30 pounds of ozone per day at an injection �y V <br /> pressure of 55 pszg The system is treating BTEX and the <br /> gasoline additive MTBE as part of a groundwater remediation <br /> program The ozone generator is housed within a NEMA 4X z <br /> enclosure, and includes automatic solenoid valves for 15 <br /> injection points, a PLC controller, and a remote telemetry system <br /> with an mternet-based interface 30-1h/day ozone generator at the Site. <br /> The ozone injection system includes the ARCE Systems HC series ozone generator,a high-pressure <br /> oxygen concentrator,and integrated controls.The ozone generator is piped to the injection points using <br /> Teflon tubing that is buried within a PVC carrier pipe The carrier pipe protects the tubes while <br /> allowmg access of repaus or replacement are necessary The turnkey ozone generating system was <br /> installed and operating within two days of arriving at the site <br /> Results <br /> • The HC Series Ozone Generator shown above was installed at a gasoline release site in January of <br /> 2002 A total of fifteen ozone spargung wells were installed throughout the source area and within the <br /> soluble phase plume Ozone was injected at a depth of 20 feet below the static water table elevation. <br /> The wells were cycled on and off—ozone was injected into a well for several hours and then the <br /> solenoid valve was closed.Thus pulsing operation created a mixing effect within the groundwater <br /> plume and enhanced the destruction of MTBE and BTEX.The site reached the cleanup objectives in <br /> less than five months, and a"monutoring only"phase is being implemented <br /> Sample WrES= BTEX <br /> Location 01/11/02 05/03/02 Reduction 01111102 05/03/02 Reduction <br /> MW-101 8,567 245 971% 3,684 36 990% <br /> MW-102 9,129 58 994% 3,265 21 994% <br /> MW-103 4,300 75 983% 1,102 90 992% <br /> MW-104 4,257 32 999% 1,326 23 998% <br /> MW-105 763 13 998% 301 59 980% <br /> MW-106 367 36 990% 159 20 987% <br /> MW-107 1,328 38 997% 571 14 998% <br /> MW-108 3,894 450 884% 1,679 2 7 998% <br /> r <br />