期刊
JOURNAL OF FOOD ENGINEERING
卷 120, 期 -, 页码 100-109出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jfoodeng.2013.07.020
关键词
UV light; Taylor-Couette unit; Mixing; Escherichia coli; Opaque liquids; Apple cider; Carrot juice; Soy milk; Model solutions
资金
- Agriculture and Agri-Food Canada (AAFC) through the Risk Mitigation Initiative
The pilot-scale Taylor-Couette UV unit was tested at turbulent vortices (TV), transitional (TRA) and Couette-Poisuille (CP) flow conditions to treat apple cider (pH 3.65, alpha = 17.41 cm(-1)), carrot juice (pH 6.31, alpha = 52.69 cm(-1)) and soy milk (pH 7.04, alpha = 162.01 cm(-1)) for inactivation of Escherichia coli ATCC 8739. The germicidal effectiveness of Taylor-Couette unit was dependent on Taylor and Reynolds numbers and flow regimes formed in the annulus. From all studied flow regimes the CP flow resulted in the lowest microbial inactivation. For instance at the flow rate of 1500 ml/min and rotation of 0 rpm the UV decimal reduction dose in apple cider was of 13.15 +/- 0.45 mJ/cm(2). On the contrary the superior E. coli inactivation was achieved at the TV flow (1500 mL/min, 200 rpm,), characterised by the least UV decimal reduction dose of 4.57 +/- 0.35 mJ/cm(2). Obtained results indicate that Taylor-Couette UV unit provided efficient mixing conditions capable of overcoming the low penetration of UV photons in opaque liquids. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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