Biofilm Minutes - Once-through cooling systems

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In large industrial cooling water systems (CWS), in particular once through cooling systems (OTC), biological growth on surfaces, a phenomenon usually known as "biofouling", causes a number of issues. For these reasons, chemical treatments (biocides) are commonly applied, to prevent and limit such microbiological proliferation. In the OTC of this large power plant, chlorine dioxide dosage was fine tuned to achieve the best efficiency, reducing at the same time as much as possible the corrosion of the old heat exchangers - caused both by bacteria (microbially influenced corrosion, MIC) and by the oxidizing chemical.

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