Evaluation on sterile effect of water treatment equipment of compound electromagnetic field

  Objective   To explore the sterile effect and possible mechanism of the water treatment equipment of compound electromagnetic field(equipment for short).

  Methods   Sterilization Test: The simulated water prepared with 8 099 of Escherichia coli(E.coli)were treated by the equipment for 60 s.During the treatment, the water samples were taken in 0, 15, 30, 45 and 60s and immediately incubated at 37℃ and 44.5℃ to deter mine the densities of E.coli.Continual Sterilization Test: Three kinds of water were made: (1)Tap water disposed with autoclave.(2)Dechloridizedtap water treated by the sterile state of the equipment for 3 min.(3)Dechloridizedtap water treated by the sterile state of the equipment for 3 min and colloidal pr ecipitation state of the equipment for 20 min.8 099 of E.coli Were added in these three kinds of water and stayed there for 3 h.During the treatment, the water samples were taken in 0, 0.5, 1, 2 and 3 h and incubated at 37℃ and 44.5℃ to determine the densities of E.coli.

  Results   (1) The sterile ratio of the simulated water sample was 100% in 30 s by the equipment.(2)The sterile ratio of the water sample readded bacteria was 100% in 60 min.

  Conclusion   The equipmenthas rapid and effective sterile effect and some continual sterile effect.