Plasma and pulsed electric field combined sterilization device and method

Abstract

The invention discloses a plasma and pulsed electric field combined sterilization device and method. The device comprises a plasma sterilization device and a pulsed electric field device, wherein theplasma sterilization device is used for performing uniform discharge on a bacteria carrying liquid to produce active substances for sterilization, and the bacteria carrying liquid treated by plasma isobtained; the pulsed electric field device is connected with the plasma sterilization device and used for producing transmembrane voltage for inner and outer sides of spores of the bacteria carryingliquid treated by plasma under the action of an electric field, so that the spores are killed after the transmembrane voltage is accumulated to a preset threshold, and the finally sterilized bacteriacarrying liquid is obtained. The device combines the plasma sterilization device and the pulsed electric field device for use, plasma treatment and pulsed electric field killing are adopted sequentially, so that the sterilization effect is far better than independent action of plasma and the pulsed electric field, and treatment efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of water body sterilization, in particular to a plasma and pulse electric field combined sterilization device and method. Background technique [0002] At present, there are many plasma methods for killing bacterial pathogens in water. Many researchers in related technologies have proposed methods of using plasma or pulsed electric fields to kill bacteria in water, but most of the methods are aimed at bacteria with weak resistance such as Escherichia coli. . The water content of the spores in the highly resistant bacteria is extremely low, and the outer membrane structure is complex, resulting in unsatisfactory effects of pulsed electric field or plasma treatment alone, and the effect is not good. [0003] When the plasma acts alone in the liquid, it will first react with water to generate active substances, and then transmit the active substances to the cell surface through liquid diffusion, which greatly ...

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Problems solved by technology

[0002] At present, there are many plasma methods for killing bacterial pathogens in water. Many researchers in related technologies have proposed methods of using plasma or pulsed electric fields to kill bacteria in water, but most of the methods are aimed at bacteria with weak resistance such as Escherichia coli.

The water content of spores in bacteria with strong resistance is extremely low, and the structure of the outer membrane is complex, resulting in unsatisfactory effects of pulsed electric field or plasma treatment alone, and the effect is not good.

[0003] When the plasma acts alone in the liquid, it will first react with water to produce active substances, and then transmit the active substances to the cell surface through liquid diffusion, which greatly weakens the treatment effect of the plasma

However, spores have a special outer surface structure, and it is more difficult for active substances to enter, making the bactericidal effect very unsatisfactory.

It is better to treat weakly resistant bacteria such as Escherichia coli in the liquid by the pulsed electric field alone. When dealing with bacteria such as spores, it is difficult to polarize due to its low water content, so it cannot produce enough transmembrane Voltage destroys cells

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