JP2011104534A - Microbubble generator, bubble micronizing material used for the generator, and gas/liquid reaction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generator causing no, or hardly causing clogging of the bubble micronizing material of the microbubble generator, and a gas/liquid reaction apparatus equipped therewith. <P>SOLUTION: A chromaticity removing device which is the gas/liquid reaction apparatus includes the microbubble generator (1) discharging a bubble mixed liquid containing the microbubbles. A buffer coil (17) micronizing bubbles by passing the bubble mixed liquid is provided in a flow path (122) of the bubble mixed liquid. In the buffer coil (17), flexible or elastic bristles (171) are disposed in a dense state fixing the outer peripheral edge inwardly in a spiral frame body (170), tips of the bristles (171) abutting or overlapped are free ends, and deformed by the pressure of a gas/liquid mixed flow. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fine bubble generator, a bubble refining material used for the generator, and a gas-liquid reaction apparatus. More specifically, the distribution of the bubble particle size formed by the fine bubble generator can be kept within the required range, and clogging of the discharge part due to suspended solids (SS) in the liquid to be treated has been prevented. About things.

  In the wastewater treatment apparatus, ozone gas is used for the purpose of removing chromaticity components that could not be removed by biological treatment in the liquid to be treated, for example. Specifically, the ozone gas is dissolved in the liquid to be treated under pressure and then released to atmospheric pressure, thereby generating extremely fine bubbles of ozone gas. The chromaticity component can be removed by dissolving it.

  As a generator that generates extremely fine bubbles used for such processing, there is a fine bubble generator described in Patent Document 1, for example. This generator gives a swirl force to the flowing water by passing water through a water-permeable hole that runs obliquely with respect to the pipe line in the body of the fountain nozzle, and inserts the tip of the fountain nozzle into the water inlet of the pipe body. By spouting the flowing water vigorously in the vicinity of the water inlet provided with a suction gap, air is taken into the flowing water, thereby generating large bubbles, which are ruptured by the shearing force of the flowing swirling water, and further It produces small microbubbles.

JP2007-117799A

However, the fine bubble generator described in Patent Document 1 has the following problems.
That is, since ozone gas is harmful to the human body and has an adverse effect on the environment, it is necessary to prevent the ozone gas itself from being released into the atmosphere by changing it to oxygen in the liquid to be treated as much as possible. For that purpose, it is necessary to make ozone gas into fine bubbles and slow the ascent rate in the processing liquid. However, if the swirl force is given to the flowing water and it is simply released to the atmospheric pressure, it is formed by the fine bubble generator. The bubble particle size distribution is wide, the particle size varies, and is distributed in the range of several micrometers (μm) to several tens of micrometers.

  Bubbles with a particle size of several tens of micrometers have a relatively high ascent rate, so they can easily rise to the liquid surface of the liquid to be treated in the ozone gas reaction tank in a short time, and ozone gas is released from the liquid surface to the atmosphere. There is a risk of adverse effects on the environment. In order to prevent this, it is necessary to suppress the particle diameter of the ozone gas bubbles to 10 micrometers or less.

  The inventors of the present invention have conducted research to stably supply fine bubbles, and on the discharge side of the fine bubble generator, a cotton lump, a mesh having a fine mesh, a liquid-permeable / breathable nonwoven fabric, etc. When the material to be refined is placed and the gas-liquid mixture is passed through them, the bubbles that have passed through the cell refinement material have a narrow distribution range of the bubble particle size and tend to be biased toward the finer, ozone gas treatment It was found that bubbles having a particle size necessary for the production can be stably obtained.

However, it was found that suspended substances are dispersed in the water to be treated, and suspended substances accumulate when the gas-liquid mixture containing suspended substances passes through the refined material, causing the refined material to become clogged.
When the micronized material becomes clogged, it is necessary to stop the chromaticity component removing device (decoloring device) and clean or replace the bubble micronized material. This results in a decrease in processing efficiency.

(Object of the present invention)
An object of the present invention is to provide a fine bubble generator in which the fine bubble generating material of the fine bubble generator does not clog or hardly cause clogging due to suspended substances, a bubble refiner used in the generator, and a fine bubble generator. Another object is to provide a gas-liquid reactor.

Means taken by the present invention to solve the above problems are as follows.
(1) The present invention
Introducing a gas-dissolved liquid in which a gas is dissolved in a liquid to be treated by a gas-liquid mixing means into a casing, and includes fine bubbles generated through a throttle portion that restricts a flow path area provided in the casing A fine bubble generator for discharging a bubble mixture,
A bubble refining material is provided in the flow path of the bubble mixed solution to allow the bubble mixed solution to pass therethrough, and the bubble refining material includes flexible and elastic hair and / or fibers. The hair and / or fiber having flexibility or elasticity are arranged in a dense state from the outer peripheral edge inward, and the tips that contact or overlap are deformed by the pressure of the gas-liquid mixed flow. The free end,
It is a fine bubble generator.

(2) The present invention
A bubble refining material constituting the fine bubble generator of (1),
Flexible or elastic hairs and / or fibers are densely arranged inward from the outer periphery, and the flexible or elastic hairs and / or fibers are fixed at the outer periphery and abut or overlap. The tip is a free end that is deformed by the pressure of the gas-liquid mixed flow,
It is a bubble refining material.

(3) The present invention
Flexible or elastic hairs and / or fibers are fixed to a spiral frame that can be accommodated in the flow path,
It is a bubble refining material as described in said (2).

(4) The present invention
A treatment tank for storing the liquid to be treated;
A gas-liquid mixing pump that sucks the liquid to be processed from the processing tank and mixes it with the reaction gas;
A pressurized tank to which the gas-liquid mixture is sent from the gas-liquid mixing pump;
The fine bubble generator of the above (1), wherein a gas-liquid mixture is sent from a pressurized tank, and a bubble mixture containing fine bubbles of the reaction gas is sent to the treatment tank;
With
It is a gas-liquid reactor.

  The “flexible or elastic hair and / or fiber” can be directly fixed to the inner wall of the flow channel, or can be fixed to a spiral frame or an annular frame that can be accommodated in the flow channel.

Examples of the gas-liquid reactor include, but are not limited to, an aeration treatment device and a chromaticity removal device in wastewater treatment, a deodorization device for equipment, a sterilization device for treated water, and the like.
In addition, the bubble generator of the present invention can use, for example, a reaction gas such as oxygen, nitrogen, carbon dioxide, ozone, etc., and can generate extremely fine reaction gas bubbles of the order of micrometers in the liquid to be treated. It can be used for various gas-liquid reactors.

  For example, if oxygen is dissolved in water to generate fine oxygen gas bubbles in the water, high-concentration oxygen water can be produced. If this is used, it is effective for aeration of activated sludge treatment. When high-concentration oxygen water is used in the aeration tank, the effect of activating microorganisms in the activated sludge is greatly increased even in a shallow tank where sufficient dissolution efficiency cannot be obtained with an air diffuser.

  Similarly, if fine nitrogen gas bubbles are generated in the water, deoxygenated water (reduced oxygen reduction) can be created, which can be used to prevent oxidation of foods and to reduce corrosion inside pipes. effective. Similarly, by generating fine carbon dioxide gas bubbles in water, high-concentration carbonated water can be produced. Furthermore, when ozone gas bubbles are generated in water, a high-concentration ozone aqueous solution can be produced, which is highly effective for deodorization, sterilization, decolorization, and the like.

(Function)
The operation of the fine bubble generator and gas-liquid reactor according to the present invention will be described. Here, a gas-liquid reaction apparatus is a chromaticity component removal apparatus in wastewater treatment, and an example using ozone gas as a reaction gas will be described. In addition, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later, but the reference numerals are the same as the reference numerals described in the claims. It is only for the purpose of facilitating understanding of the contents, and the meaning of each component is not limited to the above-described parts.

The gas-liquid mixing pump (320) sucks water to be treated such as raw water containing chromaticity components from the reaction tank (31), mixes ozone gas with the water to be treated, and sends it to the pressurized tank (322).
In the pressurized tank (322), ozone gas is dissolved in the pressurized liquid to be treated to form an aqueous ozone solution, and the aqueous ozone solution is sent to the fine bubble generator (1). The aqueous ozone solution sent to the fine bubble generator (1) passes through the throttle unit (13). Thereby, the ozone aqueous solution is depressurized and returned to the atmospheric pressure. At that time, fine bubbles are generated to become a bubble mixture. The bubble mixed solution passes through the bubble refining material (17), and then is sent to the reaction tank (31) to be mixed with the remaining liquid to be processed. In the chromaticity component removing device (3), the chromaticity component in the liquid to be treated comes into contact with the ozone gas and is removed by repeating the process.

  When the air bubble mixture passes through the air bubble refining material (17), the air bubbles having a large diameter are ruptured and broken by the dense hair (171) to become extremely fine air bubbles. These fine bubbles stay in the liquid in the reaction tank (31) for a long time because the ascending speed in the bubble mixed liquid mixed with the liquid to be treated is relatively slow. It is removed by contact and is thereby decolorized. In the reaction tank (31), ozone undergoes a chemical change to oxygen and is released from the liquid surface into the atmosphere. For this reason, an exhaust ozone decomposing apparatus is unnecessary or a small one is sufficient.

  In addition, suspended solids in the liquid to be treated may entangle with the dense hair (171) when passing through the bubble refining material (17) and cause clogging, but the dense hair (171 ) Bends and deforms toward the downstream side due to the pressure of the flow of the bubble mixture, and at that time, the entangled suspended matter separates from the dense hair (171), and as a result, the bubbles are ruptured and refined Clogging is prevented while maintaining the function to perform.

  According to the present invention, since the contact area between the liquid to be treated and the bubbles is increased by making the bubbles into fine bubbles using the fine bubble generator, the distribution of the formed bubble particle diameter can be kept within a required range. The liquid reaction efficiency is improved. This eliminates the need for excessive injection of a reaction gas such as ozone, and increases the effects of sterilization and decolorization even with a small amount. In addition, since the bubble refining material does not cause or is unlikely to cause clogging of the discharge part due to suspended solids (SS) in the liquid to be treated, for example, the chromaticity component removing device etc. is stopped as in the past. Further, it is possible to prevent the efficiency of the wastewater treatment from being reduced by stopping the subsequent processing, such as cleaning or replacing the bubble refining material.

The structure of the fine bubble generator which concerns on this invention is shown, (a) is explanatory drawing which showed the external appearance, (b) is explanatory drawing which showed the AA cross section. The perspective view which shows the structure of the buffer coil which is a bubble refinement | miniaturization material which concerns on this invention. Explanatory drawing which shows the structure of the chromaticity component removal apparatus which concerns on this invention. The perspective view which shows the structure of other embodiment of the bubble refinement | miniaturization material which concerns on this invention. Explanatory drawing which shows an example of the magnitude | size of the fine bubble produced | generated by the fine bubble generator. In the wastewater treatment in pig farms, it shows the ability to produce high-concentration oxygen water with a gas-liquid reactor in which only the reaction gas used is replaced with oxygen, with the same configuration as the chromaticity component removal device, (a) is a gas-liquid reactor (B) is a graph which shows the time of a gas-liquid reaction device stop.

  The present invention will be described in detail based on embodiments shown in the drawings.

  As shown in FIG. 1, the fine bubble generator 1 has a casing 10 having an inlet 110 on one end side and an outlet 120 on the other end side. The casing 10 includes an introduction side member 11 having an introduction port 110 and a discharge side member 12 having a discharge port 120, and an orifice 13 is sandwiched between the introduction side member 11 and the discharge side member 12. The introduction side member 11 and the discharge side member 12 are coupled by being fastened by a coupling tool 14 with the orifice 13 being sandwiched therebetween.

  Reference numeral 100 denotes an O-ring for watertightness of the contact surface between the introduction side member 11 and the discharge side member 12. Further, an O-ring 130 for watertightness is interposed between the introduction side member 11 and the orifice 13, and an O-ring 131 for watertightness is also interposed between the discharge side member 12 and the orifice 13. I'm allowed.

  A female screw part 111 is formed at the introduction port 110 of the introduction member 11, and a whirling chamber 112 is formed following the female screw part 111. Inside the whirling chamber 112, spiral plate-like whirling blades 15 are housed. The whirling blade 15 is fastened and fixed so as to be sandwiched between the end wall of the whirling chamber 112 by a fixture 16 screwed into the female threaded portion 111. In the center of the fixture 16, a water passage hole 160 that is a hexagonal hole and also serves as a wrench hole is formed.

  In addition, a throttle channel 113 is connected to the whirling chamber 112. The throttle channel 113 is formed so as to communicate with the orifice 13 and the diameter gradually decreases as the orifice 13 is approached. The orifice 13 has a small diameter on the introduction side member 11 side and a large diameter on the discharge side member 12 side, and the gas-liquid mixture passing through the orifice 13 is released to atmospheric pressure on the discharge side member 12 side.

  The discharge side member 12 has a bubble generation chamber 121 that generates bubbles when the gas-liquid mixture that has passed through the orifice 13 returns to atmospheric pressure, and the bubble generation chamber 121 has a bubble diameter larger than that of the bubble generation chamber 121. A chemical conversion chamber 122 is provided continuously. The bubble miniaturization chamber 122 is connected to the discharge port 120, and a female screw part 123 is formed in the discharge port 120.

In the bubble miniaturization chamber 122, a buffer coil 17 which is a bubble miniaturization material is accommodated.
As shown in FIGS. 1 and 2, the buffer coil 17 has a spiral frame 170 made of stainless steel. In the present embodiment, the number of turns of the spiral frame 170 is 3.5, but is not limited to this and can be set as appropriate.

  The spiral frame 170 is made of a synthetic resin having flexibility or elasticity (in this embodiment, a fluorine-based resin (PFA) that is not easily deteriorated by ozone gas is used, but it is appropriately selected according to the characteristics of the reaction gas. A large number of bristles 171 are arranged in a dense state so as to converge toward the center from the outer peripheral edge of the row of hairs, and the outer peripheral edge is sandwiched and crimped to the inner peripheral portion of the spiral frame 170 on both sides in the thickness direction. Is fixed. The tips of the dense bristles 171 are in contact with each other or overlap each other, and are free ends that can be bent and deformed by the pressure of the bubble mixed liquid that is a gas-liquid mixed flow.

  The buffer coil 17 is fastened and fixed by a fixing tool 18 screwed into the female screw portion 123 so as to sandwich the spiral frame body 170 between the end walls of the bubble miniaturization chamber 122. At the center of the fixture 18, a water passage hole 180 having a hexagonal hole shape also serving as a wrench hole is formed.

In addition, although the said introduction side member 11 and the discharge | emission side member 12 which were shown in FIG. 1 are the two members screwed together, respectively, in the said description, each is demonstrated as an integrated object.
The orifice 13 can be replaced with another orifice by releasing the tightening by the connector 14 and separating the introduction side member 11 and the discharge side member 12. As a result, the flow rate of the gas-liquid mixture passing through the orifice can be adjusted.

FIG. 3 shows a chromaticity component removing device 3 that removes the chromaticity component of raw water in wastewater treatment and is a gas-liquid reaction device. The chromaticity component removing apparatus 3 includes a raw water tank 30, an ozone reaction tank 31, an apparatus main body 32, and a treated water tank 33.
The apparatus main body 32 sucks raw water that is the liquid to be treated in the ozone reaction tank 31, mixes ozone gas supplied from an ozonizer 321 that is an ozone gas generator with raw water, and creates a gas-liquid mixed liquid. A gas-liquid mixing pump 320 for sending to a certain mixing tank 322 is provided.

  The mixing tank 322 pressurizes the gas-liquid mixture sent from the gas-liquid mixing pump 320 and dissolves ozone gas at a high concentration to produce an ozone aqueous solution that is a gas-dissolved liquid. The discharge side of the mixing tank 322 is connected to the inlet 110 of the fine bubble generator 1 by a pipe 118 (see FIG. 1B). A pipe 124 connected to the outlet 120 of the fine bubble generator 1 is introduced into the ozone reaction tank 31. The chromaticity component removing apparatus 3 performs a decoloring process while circulating the liquid to be processed in the ozone reaction tank 31.

Further, a lower limit liquid level sensor 300 is provided inside the raw water tank 30, and an upper limit liquid level sensor 330 is provided inside the treated water tank 33. When the lower limit liquid level sensor 300 senses the liquid level, the raw water is supplied to the raw water tank 30, and when the upper limit liquid level sensor 330 senses the liquid level, the treated liquid is discharged from the treated water tank 33 to the outside.
The chromaticity component removing device 3 operates when the lower limit liquid level sensor 300 is ON and the upper limit liquid level sensor 330 is OFF, and the lower limit liquid level sensor 300 is OFF or the upper limit liquid level sensor 330 is ON. Is controlled to stop.

(Function)
With reference to FIG. 1 thru | or FIG. 3 and FIG. 5, the effect | action of the chromaticity component removal apparatus 3 is demonstrated.
The gas-liquid mixing pump 320 sucks raw water (drainage) containing chromaticity components and the like from the ozone gas reaction tank 31, mixes the ozone gas sent from the ozonizer 321 with the raw water, and sends it to the mixing tank 322.
In the mixing tank 322, ozone gas is dissolved in the pressurized gas-liquid mixture to form an ozone aqueous solution, which is sent to the fine bubble generator 1. The aqueous ozone solution sent to the fine bubble generator 1 is sent into the whirling chamber 112, swirled by the swirling blades 15, turned into a swirling flow, passes through the throttle channel 11, and heads toward the orifice 13.

  The aqueous ozone solution that has passed through the orifice 13 is depressurized and released to atmospheric pressure. At that time, fine bubbles are generated to become a bubble mixture. After passing through the buffer coil 17, the bubble mixture is sent to the ozone reaction tank 31 and mixed with the remaining raw water (or a mixture of the raw water and the bubble mixture). By repeating the above process by the chromaticity component removing device 3, the chromaticity component in the raw water comes into contact with the ozone gas and is removed.

When the bubble mixture passes through the buffer coil 17, bubbles having large diameters are ruptured and split by the dense bristles 171 and the average diameter is as extremely small as about 10 micrometers as shown in FIG. Bubbles.
In FIG. 5, the length of the scale appearing at the center is 0.1 mm (100 micrometers). As can be seen from the scale, each bubble dispersed in the liquid is about 10 micrometers at the largest and about 1 to 2 micrometers at the smaller one. Is generally averaged.

  Such a fine bubble stays in the liquid in the ozone reaction tank 31 for a long time because the ascending speed in the raw water or the mixed liquid of the raw water and the bubble mixed liquid is relatively slow. The pigment component is removed by contact with ozone gas, whereby it is efficiently decolorized. In the ozone reaction tank 31, ozone undergoes a chemical change to oxygen and is released from the liquid surface to the atmosphere. For this reason, an exhaust ozone decomposing apparatus is unnecessary or a small one is sufficient.

  Further, suspended substances in the raw water may get entangled with the dense hair 171 when passing through the buffer coil 17 and cause clogging. However, the dense hair 171 is bent by the pressure at which the air bubble mixture flows. In this case, the entangled floating substance is detached from the dense hair 171 and, as a result, the function of rupturing and miniaturizing the bubbles is maintained, and clogging is prevented. .

  The buffer ring 19 shown in FIG. 4 has an annular frame 190 made of stainless steel. In the annular frame 190, a large number of flexible or elastic synthetic resin bristles 191 are arranged so as to converge from the outer peripheral edge of the hair row toward the center, and the outer peripheral edge is the annular frame 190. The inner periphery of each of the two is sandwiched between both sides in the thickness direction and fixed by being crimped. The tips of the dense bristles 191 are in contact with or overlap each other, and are free ends that can be bent and deformed by the pressure of the gas-liquid mixed flow.

  The buffer ring 19 is fixed inside the bubble miniaturization chamber 122 by various fixing means, or a plurality of the buffer rings 19 are arranged at a required interval. The operation of the buffer ring 19 is substantially the same as that of the buffer coil 17, and thus the description thereof is omitted.

Referring to FIG. 6, in wastewater treatment at a pig farm, high-concentration oxygen water is generated by a gas-liquid reactor (not shown) in which only the reactive gas used is replaced with oxygen in the same configuration as the chromaticity component removing device 3. Explain the ability.
In this embodiment, the gas-liquid reactor is used in the same manner as described in FIG. 3, and an aeration tank (both not shown) is provided between the oxygen reaction tank (corresponding to the ozone reaction tank 31 in FIG. 3) and the treated water tank. ) Was disposed to perform wastewater treatment, and the dissolved oxygen concentration of the liquid to be treated in the oxygen reaction tank was measured.
The dissolved oxygen concentration was measured using two sensors (DO1, DO2) to ensure the data.

As can be seen from the graph of FIG. 6A, the dissolved oxygen concentration in the liquid to be treated rose to a substantially saturated state about 10 minutes after the start of operation of the gas-liquid reactor.
As can be seen from the graph of FIG. 6 (b), when the operation of the gas-liquid reactor is stopped from the state where the dissolved oxygen concentration is saturated, the dissolved oxygen concentration in the liquid to be treated is rapidly reduced to about 30. After minutes, the value was very close to 0 (zero).
Thus, by using a gas-liquid reaction apparatus, the dissolved oxygen concentration in water can be saturated in a short time operation, and aeration treatment in activated sludge treatment can be performed more effectively.

  The terms and expressions used in this specification are merely explanatory and are not limiting at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 10 Casing 100 O-ring 11 Introduction side member 110 Introduction port 111 Female thread part 112 Whirling chamber 113 Constriction flow path 118 Pipe 12 Discharge side member 120 Discharge port 121 Bubble generation chamber 122 Bubble refinement chamber 123 Female screw part 124 Piping 13 Orifice 130, 131 O-ring 14 Connecting tool 15 Whirling blade 16 Fixing tool 160 Water flow hole 17 Buffer coil 170 Spiral frame 171 Hair 18 Fixing tool 180 Water flow hole 3 Chromaticity component removing device 30 Raw water tank 300 For lower limit Liquid level sensor 31 Ozone reaction tank 32 Main body 320 Gas-liquid mixing pump 321 Ozonizer 322 Mixing tank 33 Treated water tank 330 Upper limit liquid level sensor 19 Buffering 190 Annular frame 191 Hair

Claims (4)

The gas-liquid mixing means (320, 322) introduces a gas-dissolved liquid in which a gas is dissolved in the liquid to be treated into the casing (10), and restricts the flow path area provided in the casing (10) ( 13) a fine bubble generator for discharging a bubble mixture containing fine bubbles generated through
A bubble refining material (17) is provided in the flow path (122) of the bubble mixed solution to allow the bubble mixed solution to pass therethrough, and the bubble refining material (17) is flexible or The elastic bristles (171) and / or fibers are densely arranged inward from the outer periphery, and the flexible or elastic bristles (171) and / or fibers are fixed at the outer periphery and abut Or the overlapping tip is a free end that is deformed by the pressure of the gas-liquid mixed flow,
Fine bubble generator. A bubble refining material (17) constituting the fine bubble generator according to claim 1,
Flexible or elastic hair (171) and / or fibers are densely arranged inward from the outer periphery, and flexible or elastic hair (171) and / or fibers are fixed at the outer periphery The abutting or overlapping tip is a free end deformed by the pressure of the gas-liquid mixed flow,
Bubble refining material. Flexible or elastic hair (171) and / or fibers are fixed to a spiral frame (170) that can be accommodated in the flow path (122).
The bubble refining material according to claim 2. A treatment tank (31) for containing the liquid to be treated;
A gas-liquid mixing pump (320) that sucks the liquid to be treated from the treatment tank (31) and mixes it with the reaction gas;
A pressurized tank (322) to which the gas-liquid mixed liquid is sent from the gas-liquid mixing pump (320);
The fine bubble generator according to claim 1, wherein the gas-liquid mixture is sent from the pressurized tank (322) and the bubble mixture containing the fine bubbles of the reaction gas is sent to the treatment tank (31).
With
Gas-liquid reactor.