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By Edgar Berkey and Tiffany Zachry (Eds.)

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8 W/cm ) and air injection rates (500 and 1000 mL/min). First-order rate constants are listed for removal of the various contaminants using sonication alone, vapor stripping alone, and the combined sonication/vapor stripping system. The first-order rate constants are observed to be considerably larger for the combined system, as compared to using either sonication or vapor stripping alone. A plausible explanation for this behavior was described above. It is also worth noting that the same trends are observed for TCA and PCE as were reported previously for the CCI4 and TCE systems.

The reactor volume was 500 mL. Figure 14 shows the results of the residual concentration of TCA after a function of the number of residence times throughput through the reactor (well). Initially, the reactor was filled with artificial groundwater containing no contaminant; at the beginning of the run, the reactor was fed with two feed streams (one containing the uncontaminated groundwater; the other containing a saturated feed stream of the organic contaminant). The ratio of these two feed streams was determined by mass balance calculations to provide a nominal initial concentration of -50 mg/L.

These studies were conducted aerobically and anaerobically. Task 9. Develop Computer Simulation Model to Describe Combined InWell Sonication, In-Well Vapor Stripping, and Biodégradation Technical Objectives The technical objectives of the laboratory and modeling components of this project were to develop: 1. An understanding of the behavior of the combined sonication and in-well vapor stripping process, and 2. A predictive simulation model of the system that is tested ("validated") on the lab-scale system, used to design the field pilot system, and later used to interpret the operation of the field pilot system.

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