engleski

APPLICATION OF THE DESIGN OF EXPERIMENT FOR CORROSION PREDICTION IN MICROBREWERY

The aim of this research was to show the applicability of the design of experiment (DOE) in the chemical, biotechnological and food industry. As a model experiment we present an optimization of the corrosion effects occurring in the stainless-steel coatings in the microbrewery tanks. For this purpose different concentrations of heavy metal ions (Al, Cu, Fe, Mo and Sn) were monitored in the water after rinsing of laboratory brewery vessel. Rinsing process was optimized considering the time of rinsing and the concentration of HNO3 acid in the solution prepared for the rinsing of brewery vessel. Experiment design, rinsing optimization and system prediction was made by using computer program Design Expert (version 7, State-Ease Company, USA). Optimization conditions were determined (optimal rinsing time and concentration of HNO3 acid in the solution prepared for vessel rinsing) using two criteria: minimum concentration of HNO3 allowed for satisfying vessel rinsing (according to the brewery sanitation protocol) and maximum concentration of HNO3 allowed (according to the Water Act NN 107/95, 150/05). The results of model prediction were tested by additional experiments, and very good agreement was found between modeled and experimental results. In addition, calculated optimized values satisfied the criteria of brewery sanitation so therefore they can be used in the brewery sanitation. Based on our results, we can recommend the DOE approach as a cost reductive and effective tool for optimization of complex systems such are occurring in different chemical, biotechnological and food industries.

design of experiment; brewery; optimization

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