Singh J P, Ghaly A E
Department of Process Engineering and Applied Science, Dalhousie University, P.O. Box 1000, Halifax, NS, Canada.
Bioprocess Biosyst Eng. 2006 Oct;29(4):269-81. doi: 10.1007/s00449-006-0076-x. Epub 2006 Aug 30.
The effectiveness of coil UV reactor series for the online sterilization of cheese whey was compared to those of the single conventional and coil reactors at various flow rates (5-70 mL/min). The residence time varied from 168 to 12 min and from 48 to 24 min for the single and the series reactors, respectively. Hundred percent destruction efficiency could not be achieved in the single reactors whereas in the coil reactor series the destruction efficiency reached 100% at the flow rates of 35 and 40 mL/min. The rate of microbial destruction was described by polynomial equation for the single coil reactor and by exponential equations for the single conventional reactor and the coil reactor series. The temperature of the effluent decreased with the increase in flow rate in all the reactors. The maximum effluent temperatures in the single conventional reactor, single coil reactor and coil reactor series were 45.8, 46.1, and 36.4 degrees C (Deltat = 20.8, 21.1, 11.4 degrees C), respectively. The flow in all the reactors was laminar (R ( e ) = 1.39-20.10) and the Dean number was in the range of 1.09-15.41 in the coil reactors. Visual observation revealed less fouling on the UV lamps of coil reactors than on that of the conventional reactor due to the impact of Dean flow. The total operating time during which 100% destruction efficiency is achieved prior to the advent of fouling was 240 min in the coil reactor series compared to only 45 min in the conventional reactor.
将盘管式紫外线反应器系列用于奶酪乳清在线杀菌的效果，与单个传统反应器和盘管式反应器在不同流速（5 - 70毫升/分钟）下的杀菌效果进行了比较。单个反应器的停留时间为168至12分钟，而串联反应器的停留时间分别为48至24分钟。单个反应器无法实现100%的破坏效率，而在盘管式反应器系列中，在流速为35和40毫升/分钟时破坏效率达到了100%。单个盘管式反应器的微生物破坏速率用多项式方程描述，单个传统反应器和盘管式反应器系列的微生物破坏速率用指数方程描述。在所有反应器中，流出物的温度随流速增加而降低。单个传统反应器、单个盘管式反应器和盘管式反应器系列中的最高流出物温度分别为45.8、46.1和36.4摄氏度（Δt = 20.8、21.1、11.4摄氏度）。所有反应器中的流动均为层流（Re = 1.39 - 20.10），盘管式反应器中的迪恩数范围为1.09 - 15.41。肉眼观察发现，由于迪恩流的影响，盘管式反应器紫外线灯上的污垢比传统反应器的少。盘管式反应器系列在结垢出现之前达到100%破坏效率的总运行时间为240分钟，而传统反应器仅为45分钟。
