直流脉冲电磁场灭活循环水中大肠杆菌的研究  

Inactivation of Escherichia Coli in Recycle Water System by Pulsed Direct Current Magnetic Field

作　　者：李梅[1] 蒋波 于德爽[3] 

机构地区：[1]河南科技大学化工与制药学院,河南洛阳471003 [2]镇江市给排水管理处,江苏镇江212002 [3]青岛大学环境科学与工程系,山东青岛266071

出　　处：《中国给水排水》2007年第15期58-61,共4页China Water & Wastewater

基　　金：国家自然科学基金资助项目(59838300)

摘　　要：采用脉冲磁场对循环水系统进行杀菌试验，考察了影响杀菌效果的因素。结果表明，脉冲磁场对大肠杆菌具有良好的灭活作用，杀菌率随磁感应强度的增加和处理时间的延长而提高，且随着水温、脉冲频率和菌群初始浓度的提高而提高。当磁感应强度〉600mT、处理时间〉45min、脉冲频率为50～60kHz时，杀菌率〉90％。磁场对菌体的灭活是由于其对细胞膜造成了不可修复的破坏，导致细胞质溶出，从而使细胞丧失正常的生理功能。A sterilization experiment in the recycle water system was carried out by pulsed magnetic field, and the factors influencing the sterilization effect were investigated. The results show that pulsed magnetic field has a favorable lethal effect on E. coli. The sterilization rate increases when magnetic field intensity is enhanced and the treatment time is prolonged. The sterilization rate increases also with increasing the water temperature, the pulse frequency and the initial bacterial concentration. When the magnetic intensity is above 600 mT, the treatment time is over 45 min and the pulse frequency is 50 to 60 kHz, the sterilization rate is above 90%. The sterilization of bacteria can be summarized as follows： ① the magnetic field damages the cell membrane beyond repair; ② the cytoplasm is dissolved; ③ the cell loses its physiological function.

关 键 词：大肠杆菌 脉冲磁场 存活率 细胞膜 

分 类 号：TQ085[化学工程]