Bacterial Selectivity in the Colonization of Surface Materials from Groundwater and Purified Water Systems 901423

A variety of metals and surface modification techniques were evaluated for corrosion and biofilm resistivity. Coupons in a modified Robbins' Spool device contacted water in a parallel-flow manifold test bed. System water was obtained from a water well with a chronic history of fouling and corrosion. Several surface types resisted corrosion; however, no metal or surface modification prevented attachment of bacteria as revealed by epifluorescence microscopy or classical culturing techniques. Different surfaces did result in modified bacterial consortia. In a separate series of experiments, stainless steel coupons and Teflon™ in laminar flow cells were exposed to multi-cartridge purified water exceeding 17 megohms resistivity. These coupons were heavily colonized with bacteria in 30 days. However, coupons in static stirred reactors charged with the same water demonstrated little colonization.


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