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97397 PERFORMANCE OF HYDROGEN PEROXIDE AS A COOLING WATER BIOCIDE AND ITS COMPATIBILITY WITH OTHER COOLING WATER INHIBITORS

Product Number: 51300-97397-SG
ISBN: 97397 1997 CP
Author: Michael F. Coughlin, Lyle Steimel
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Hydrogen peroxide has been evaluated in a pilot cooling tower system as an alternative to continuous chlorination and intermittent dosing with non-oxidizing biocides. Hydrogen peroxide demand in the cooling system was considerably higher than predicted based on its vapor pressure and spontaneous decomposition in alkaline waters. This might be explained by the selection of peroxidase and catrdase positive organisms in the cooling water which decompose hydrogen peroxide to water and oxygen. Although continuous feed of 2 to 3 ppm of hydrogen peroxide failed to control the bulk water bacterial population, it did suppress the growth of sessile organisms. Hydrogen peroxide was found to be corrosive toward mild steel and copper. However the effect could be adequately controlled through the use of proprietary corrosion inhibitors. Deposit control agents selected for their ability to with stand oxidation by hydrogen peroxide were highly successful in maintaining a low rate of scale formation. Based on these observations and the environmentally friendly nature of hydrogen peroxide, its use as an alternative cooling water biocide should be further explored. Keywords: hydrogen peroxide, corrosion, deposition, planktonic, biofilm, ultraviolet light, glutaraldehyde, tetrakishydroxymethyl phosphonium chloride
Hydrogen peroxide has been evaluated in a pilot cooling tower system as an alternative to continuous chlorination and intermittent dosing with non-oxidizing biocides. Hydrogen peroxide demand in the cooling system was considerably higher than predicted based on its vapor pressure and spontaneous decomposition in alkaline waters. This might be explained by the selection of peroxidase and catrdase positive organisms in the cooling water which decompose hydrogen peroxide to water and oxygen. Although continuous feed of 2 to 3 ppm of hydrogen peroxide failed to control the bulk water bacterial population, it did suppress the growth of sessile organisms. Hydrogen peroxide was found to be corrosive toward mild steel and copper. However the effect could be adequately controlled through the use of proprietary corrosion inhibitors. Deposit control agents selected for their ability to with stand oxidation by hydrogen peroxide were highly successful in maintaining a low rate of scale formation. Based on these observations and the environmentally friendly nature of hydrogen peroxide, its use as an alternative cooling water biocide should be further explored. Keywords: hydrogen peroxide, corrosion, deposition, planktonic, biofilm, ultraviolet light, glutaraldehyde, tetrakishydroxymethyl phosphonium chloride
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