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LL;H VfL;AL ifIJLLETfN # fVA <br /> Oxygen Release Compound,ORC® <br /> Microbial Fouling <br /> Microbial Biofouling <br /> In highly oxygenated environments, microbes which can drive the bioremediation process will <br /> flourish. Consequently, microbial biomass will increase dramatically under the enriched <br /> conditions. The biological growth can clog well screens and packing that are designed to allow <br /> groundwater flow to pass through the well. <br /> The use of ORC in an Oxygen Barrier easily combats the problem of biofouling by generating <br /> a highly localized, elevated pH. Microbial growth is inhibited in these environments. The use <br /> of ORC does not raise pH levels throughout an entire treatment area which could jeopardize the <br /> success of bioremediation. pH is elevated and highly localized at the ORC source alone thus <br /> allowing microbes to thrive elsewhere in the treatment zone. <br /> Iron Fouling <br /> in oxygenated environments dissolved metals, such as iron, can oxidize and precipitate as <br /> hydroxides. The oxidized metals will deposit on the well casings and create blockages which <br /> inhibit the efficacy of oxygen distribution. This problem usually occurs when the soluble <br /> (ferrous) iron content of the treatment area is fairly high. Even in these cases, it is easily <br /> remedied by pretreatment technologies, such as the use of polyphosphates, or various cleaning <br /> methods, such as the use of hydrochloric acid, which remove the precipitates. <br /> Since ORC releases oxygen very slowly, the possibility of iron fouling is markedly reduced <br /> when compared to other oxygen delivery systems. The use of hydrogen peroxide, for example, <br /> would be difficult to use under high iron conditions. It should be noted that where oxygen <br /> induced fouling is severe, the general feasibility of using aerobic remediation methods would <br /> be in question. <br /> REC EN ES IS ---------------------------------------------------------------------------------- <br /> Bioremediation Products 27130A Paseo Espada, Ste 1407, San Juan Capistrano, CA 92675 <br /> Phone: 714-443-3136 Fax: 714-443-3140 <br />