8. Vapor space tunnel pasteurizer corrosion completely eliminated with the use of a “non-oxidizing” biocide to control pasteurizer bacteria

B. ORNAY (1), D. Duff (2); (1) Nalco – An Ecolab Company, Woodstock, GA, U.S.A.; (2) BW Container Systems, Romeoville, IL, U.S.A.

Packaging (Bottles, Draft and Cans)
Thursday, October 8
1:45–3:30 p.m.
River Terrace 2

Thanks to utilization of the most recent technological innovations for reducing water usage in tunnel pasteurizers, total daily water consumption is now at record low levels. Minimal pasteurizer water turnover results in increased dosage rates of the conventional biocide treatment program consisting of chorine/bromine, which is widely used to control bacteria. This increase in the feed of chlorine/bromine is a direct result of a significant increase in organic load in low water consuming pasteurizers. This situation creates an environment consisting of elevated levels of haloamines, which condense and collect on the metal surfaces of the pasteurizer. Through the cycling of evaporation and condensation, elevated levels of chloride/bromide ions deposit on the surface. These highly corrosive ions penetrate the protective passivation layer of 304 stainless steel, not allowing it to repassivate. This leads to corrosion, which is not only unsightly but could diminish the integrity of the pasteurizer structure, thus reducing the life expectancy of a very expensive asset. The solution to this phenomenon, proven out recently at a regional U.S. brewery, is to move away from a conventional chlorine/bromine pasteurizer treatment program and switch to a “non-oxidizing” biocide treatment program. This presentation chronicles the issues observed while treating the pasteurizer with chlorine/bromine and the successful results after switching to the “non-oxidizing” biocide treatment program.

Brian Ornay is Nalco’s global beverage industry technical consultant, based out of Atlanta, GA. During his 14 year career at Nalco, he has been employed in field sales, marketing, and technical support. To complement his Nalco career, he worked for Anheuser-Busch InBev for 6 years in the Packaging Department of the Cartersville, GA, brewery. As part of Brian’s responsibilities during those 6 years, he was personally responsible for pasteurizer water and energy optimization projects. Brian holds a B.S. degree in chemical engineering from the University of Tennessee. Brian is a member of MBAA. Brian currently supports the Nalco sales force to ensure brewing best practices are being implemented and adhered to. As part of Brian’s role, he is the liaison between the Nalco sales force, local breweries and Nalco’s R&D Department. The focus of Brian’s role is water and energy reduction, ensuring product quality, and improving operational efficiency.

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