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TECHNICAL BULLETIN # IVA <br /> Oxygen Release Com ound ORC® <br /> p <br /> Microbial Fouling <br /> Microbial i <br /> ng <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 /> REG EN ES IS ---------------------------------------------------------------------------------- <br /> �loremedlation Products 27130A Paseo Espada, Ste 1407, San Juan Capistrano, CA 92675 <br /> Phone 714-443-3136 Fax 714-443-3140 <br />