The Sterilization Effect of Solenoid Magnetic Field Direction on Heterotrophic Bacteria in Circulating Cooling Water

Abstract

Compared to the chemical treatment of industrial circulating cooling water in the field of industrial water treatment, electromagnetic pulse sterilization technology, an advanced technology, is widely used because of its special characteristics--low energy consumption, nonpoisonous and environmentally friendly. In order to get a better cooling water sterilization effect under the premise of not polluting the environment, some experiments about sterilization of heterotrophic bacteria in industrial circulating cooling water by low frequency square wave pulsed magnetic field were carried out. The comparison experiment on the sterilization effect of low frequency square wave pulsed magnetic field on heterotrophic bacteria in industrial circulating cooling water was carried out by change relative flow direction of solenoid magnetic field and water. The bacterial inhibiting effect was 7.22%∼20.35% higher when the direction of flow of water was in parallel with the magnetic field than in anti-parallel. This study analyzed this phenomenon from the perspective of the diamagnetism of the bacteria cells and the electric dipole moment of proteins. Since the bacterium cell membrane contains diamagnetic substances, when a bacterium cell moves in parallel with the magnetic field, it would be slowed down and stay longer in the field than moving in anti-parallel, so the bacterial inhibiting effect would be stronger. Results of this study have important guiding significance for future application of magnetic field sterilization.