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from the bottom of the storage tank into a fluidized-bed <br /> bioreactor unit for treatment with subsequent discharge of <br /> post-treated water to the sanitary sewer under permit. Although <br /> we expect no free product, any such residual would remain within <br />' the storage tank pending collection for recycling as transmix. <br /> At such time as any free product was found to be present in <br /> insufficient quantity, or too highly degraded to permit <br /> recycling, emulsifier would be added to the storage tank. This <br />' would convert the free product into a colloidal material which <br /> would commingle with the water beneath and permit its treatment <br /> within the bioreactor . <br /> The primary component of the fluidized-bed system is the columnar <br /> reactor vessel which contains a consortium of non-pathogenic, <br /> hydrocarbon utilizing bacteria capable of thoroughly degrading <br /> ( i .e. mineralizing) fuel hydrocarbon contaminants to form the <br /> non-toxic end products of carbon dioxide, minerals, and water . <br /> These bacteria would be resident upon activated carbon, or <br />' similar material , which would serve as attachment substrate <br /> and encourage the development of the large biomass necessary <br /> for rapid degradation. Nutrients would be metered into the <br />' system to support biological growth; while the hydrocarbon <br /> contaminants within the extracted water would provide the <br /> bacteria the carbon necessary to meet their metabolic and energy <br /> requirements . The oxygen required for the aerobic process would <br /> be supplied by a small compressor, with influent water and the <br /> compressed air providing the force necessary to fluidize the <br /> treatment bed substrate. It is this fluidization process which <br />' makes the columnar bioreactor a particularly efficient and cost <br /> effective tool for remediation. An overview of the treatment <br /> system is attached hereto as Figure #A-1 . <br /> References <br /> Fetter, C.W . , 1988, Applied Hydrogeology, 2nd edition: <br /> Merrill Publishing Company, Columbus, OH, 592 p. <br /> Freeze, R.A. , and Cherry, J.A. , 1979 , Groundwater : <br /> Prentice-Hail , Inc . , Englewood Cliffs , NJ, 604 p. <br /> III . <br /> I <br />