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rMs Vicki McCartney Project No 8800401A 0201 <br /> . October 26, 2004 <br /> Page 9 <br /> Ozone Microsparging <br /> Ozone microsparging uses air stripping and oxidative decomposition to treat water <br /> contaminated with volatile organic compounds (VOCs) The reaction rapidly detoxifies <br /> groundwater containing VOCs to groundwater standards without producing harmful <br /> byproducts The reaction is produced with very low ozone concentrations compared to <br /> VOC concentrations in groundwater In the process, air and ozone are infected directly <br /> into groundwater through specially designed spargers to create microbubbles that have a <br /> very high surface area-to-volume ratio As the microbubbles rise within a column of <br /> groundwater, they extract or strip the VOCs from groundwater by partitioning from the <br /> aqueous to the gas phase Upon entering the microbubbles, the VOCs react with ozone <br /> in the gaseous state or in the aqueous thin layer surrounding the bubble to decompose <br /> VOCs are rapidly degraded with time In field tests, ozone microbubbles appeared <br /> effective m reducing MtBE concentrations to beyond 90% of original levels Because of <br /> the high solubility of ozone, over 10 times that of oxygen, the decomposed ozone leaves <br /> behind elevated dissolved oxygen, which has the added benefit of stimulating <br /> bioremediation <br />' cost $164,50000 <br /> Time Frame 3 years <br /> Advantages ➢ Rapidly decomposes VOCs and MtBE, and provides secondary benefit <br /> of supplying dissolved oxygen for stimulating bioremediation <br /> ➢ Reduction of volume and toxicity provide migration control from reduced <br />' source material <br /> Potential to meet remedial objectives and clean-up goals in a short <br /> period of time <br /> ➢ Does not pose a risk to the environment Ozone not consumed in <br /> remedial action decomposes to oxygen, which poses no threat in the <br /> atmosphere, and provides a secondary effect in the subsurface of <br />' enhancing biodegradation <br /> Disadvantages > Some disruption of station activities in order to install groundwater <br /> extraction system <br /> 1, <br />�4 N 1SacDP120041Pg188018800401A 4ad doc Shaw Environmental,Inc <br />