Superfine air bubble generation method and device and sterilization device using same

Abstract

The present invention provides a method and a device forming superfine bubbles retainable for a long period of time and a water treating device applying it for sterilizing and disinfecting facilities for sewage treating water. A water sterilizing and disinfecting vessel 1, a low-pressure container 2 and a superfine bubble forming device 3 are provided. The sewage treating water is charged to the water sterilizing and disinfecting vessel 1 and the treated water is discharged from a sewage re-generating water discharge pipe. Fine bubbles are formed by a fine bubble forming device 3 to be charged to the low pressure container 2. The fine bubbles charged to the low-pressure container 2 are pressurized and compressed by a booster pump 4 to become superfine bubbles, by rapidly reducing their volume, retainable for a long period of time. The superfine bubbles are charged to the sterilizing and disinfecting vessel 1 to perform sterilization by an oxidation reaction by an pressure wave accompanying disintegration of the superfine bubbles 15 and a hydroxyl free radical. The sterilizing effect is enhanced by gradually destroying of the superfine bubbles of which parts are retained for a long period of time.

Description

technical field [0001] The invention relates to a device for purifying, sterilizing and disinfecting tap water, sewer water, river water, lake water and industrial waste water, as well as a sterilizing and disinfecting equipment. Background technique [0002] There is Non-Patent Document 1 as a document showing the use and effect of fine air bubbles for purification, sterilization, and disinfection. In addition, there is Non-Patent Document 2 as a document showing the effect of sterilization with ozone water. [0003] First, based on the description in Non-Patent Document 1, the definitions of fine air bubbles and ultrafine air bubbles described in this specification are shown. The microbubbles are bubbles called microbubbles (microbubbles) having a diameter of about 50 micrometers or less. Generally, bubbles of this size shrink in the liquid by the gas in the bubbles dissolving into the surrounding fluid, and finally completely dissolve in about 2 minutes. On the other h...

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Problems solved by technology

[0012] In the prior art described in Non-Patent Document 2, considering the decomposition of ozone, it is necessary to increase the capacity of the equipment, and the economical efficiency of equipment construction is reduced.

In addition, when the equipment is in operation, the sterilization and disinfection of sewage treatment water uses ozone, which generates a high cost, and the ozone in the liquid is easy to decompose, and the concentration drops in a short time

For this reason, it is necessary to supply a large amount of ozone for a long period of time for sterilization and disinfection, and there is a problem of lowering economical efficiency.

[0013] In addition, in the sterilization and disinfection equipment using fine air bubbles and ultra-fine air bubbles, if the inflowing treatment water flow rate and the air bubble supply volume are not properly controlled, depending on the excessive or insufficient supply of air bubbles, the economic efficiency will be reduced. , in insufficient occasions, the bactericidal performance decreases, and there is a problem that the reliability of the sterilizing and disinfection equipment decreases

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