营养液加热消毒机的设计与灭菌性能试验

Design and disinfection performance test of a heating installation for nutrient solution from closed system

设计了一种专用于营养液消毒的加热消毒机，可以自动实现排液流量1m^3／h、营养液由室温加热至85℃、保温滞留0～3min的任务。杀菌试验结果表明本机对番茄萎蔫病病原菌、黄瓜枯萎病病原菌、番茄细菌性青枯病病原菌都有较好的杀灭效果；同时性能稳定、可靠。在杀灭营养液中的这3类病原菌时（起始病原菌浓度为3．9×10^5～8．3×10^5cfu／mL），75℃／90s的杀菌组合，可以达到100％的杀菌效果。

A heating sterilized machine was designed, which was specially used for disinfection of nutrient solution from closed system. The following tasks were automatically realized： 1 m^3/h treatment flow quantity, nutrient solution temperature to be heated up to 85-86℃ from circumstance temperature and time of 0-3 min to keep water at this high temperature. Tests showed that this machine had better killing effect for tomato wilting germs, cucumber withered germs and tomato bacteria green withered germs. And disinfection performance of this installation was stable and reliable. It was inferred that when the equipment was applied to kill these three pathogens （starting concentration is 3.9×10^5-8.3×10^5 cfu/mL） in nutrient solution, 75℃/90s could meet the demand of 100%sterilization rate.