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Effect of Biocide (NaOCl) in Industrial Cooling Water on Biofilm Formation and Metal Corrosion.  

강용호 (영남대학교 생물산업공학부)
박대규 (포항산업과학기술연구원)
Publication Information
Microbiology and Biotechnology Letters / v.30, no.1, 2002 , pp. 86-90 More about this Journal
Abstract
Cooling water sampled at Pohang Steel Company, Korea, was used to study the effect of biocide (NaOCl) on biofilm formation and metal corrosion. Planktonic microorganisms were killed in the presence of biocide (0.2％ NaOCl) within 1.5 h, but not sessile microorganisms in biofilms even after one week. Black color of biofilms, possibly due to the activity of sulfate reducing bacteria, were made with the natural cooling waters, while orange color of biofilms were formed when cooling waters were autoclaved or when 0.2％ NaOCl was added to the natural cooling waters. Microbially influenced corrosion rate in black color of biofilms was 2.3 fold higher than that in orange color of biofilms.
Keywords
Biocide; Biocorrosion; Biofilm; Biofouling; Cooling water;
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