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Bioventing Technology Wer �age Page 1 of 5 <br /> A Biological Remediation Technology <br /> Bioventing <br /> ► f o M. <br /> Bioventing, Cometabolic Bioventing <br /> During bioventing the oxygen concentration in the <br /> soil gas is increased by injecting air into the <br /> contaminated zone through drilled wells. In a few <br /> cases some air extraction wells may be used to <br /> control vapor migration. In contrast to soil vapor <br /> as - now, a•�v awl extraction, bioventing uses low airflow rates to <br /> provide only enough oxygen to sustain microbial <br /> activity. Oxygen is most commonly supplied by <br /> ,4 directing air flow through residual contamination in <br /> x x soil. In addition to degradation of adsorbed fuel <br /> residuals, volatile compounds are biodegraded as <br /> t vapors move slowly through biologically active soil. <br /> * Gaseous substrates can be added with the air to <br /> promote cometabolic degradation of recalcitrant <br /> „ q compounds. <br /> Status: Conventional for bioventing; emerging for <br /> cometabolic bioventing. <br /> Technology Contaminants Media Location Treatment Secondary <br /> Site Process <br /> Nonhalogenated <br /> VOC (including Vadose <br /> Bioventing gasoline and JP-4) Soil JZone In Situ NA <br /> Nonhalogenated <br /> SVOC (including <br /> diesel fuel, JP-5 <br /> and other heavy Vadose <br /> Bioventing fuels) Soil Zone In Situ NA <br /> Bioventing, dose <br /> Cometabolic Halogenated VOC IS;::12ne In Situ NA <br /> Conventional bioventing techniques are used primarily to treat aerobically biodegradable <br /> compounds such as nonhalogenated volatile organic compounds (VOCs) and semivolatile <br /> organic compounds (SVOCs). Compounds that have been successfully remediated include <br /> petroleum hydrocarbons, nonchlorinated solvents, some pesticides, and wood preservatives. <br /> http://enviro.nfesc.navy.mil/erb/restoration/technologies/remed/bio/bio-06.asp 6/17/2004 <br />