A field-scale, in-situ, slurry-phase bioremediation demonstration was conducted at the French Ltd. Superfund Site in Crosby, Texas. As part of this study, several aeration technologies were compared, based on reliability, organic chemical emissions levels, mixing, and oxygenation characteristics. An economic and technical comparison was drawn between these technologies and several high-purity oxygen-based technologies, including Praxair's (formerly, Union Carbide Industrial Gases) Mixflo™ system. Based on cost and air emissions, the Mixflo™ system was selected, and a field-scale system was designed for the French Ltd. Site. This system is currently operating.

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The behaviour of acid, neutral and alkali feedwater contaminants, which may be present in the AGR's (Advanced Gas Cooled Reactor) boilers has been examined in a test loop operating at 14.5 MPa. It has been found that deposition occurred at all contamination levels tested (1.5 μg kg-1 to 3200 μg kg-1 sodium) and could be attributed to two processes: a chemisorption reaction occurring between the steam and the dry tube walls, and at higher contamination levels, a gross deposition mechanism in the region of final dryout which experimental evidence suggests was associated with liquid film dryout.

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