JP2000325984A - Aeration treatment method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a highly efficient aeration treatment of pumped-up water containing an org. compd. without being affected by hardness components, turbidity and concn. of pumped-up water. SOLUTION: An aeration treatment apparatus A is equipped with a casing having at least one aeration chamber 5 having an opening part 7 provided to the center part of the side wall 2 thereof, a centrifugal rotary plate 11 having a plurality of blades arranged in opposed relation to the opening part provided to the center part of the side wall 2 of the aeration chamber of the casing, a drive means 22 for rotationally driving the centrifugal rotary plate through a rotary shaft 12 and an injection pipe 27 injecting water charged in the aeration chamber of the casing through the opening part toward the center part of the centrifugal rotary plate. The water injected by the injection pipe is finely pulverized by the centrifugal force caused by the rotation of the centrifugal rotary plate to be brought into contact with air sucked from the opening part to be subjected to aeration treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration method for performing aeration treatment after pumping well water or groundwater contaminated with volatile organic compounds after pumping, and aeration treatment of industrial wastewater containing volatile organic compounds. Related to the device.

[0002]

2. Description of the Related Art In recent years, pollution of well water and groundwater by volatile organic compounds, particularly organic chlorine compounds such as trichloroethylene and tetrachloroethylene, has become a social problem.

[0003] On the other hand, various purification techniques for removing or detoxifying contaminants are described in, for example, "Operation Standards for Investigation and Countermeasures for Soil and Groundwater Pollution" edited by the Water Quality Conservation Bureau of the Environment Agency. Have been studied, and demonstration tests and the like have been extensively conducted for practical use at the same time as practical use. Among them, the pumping aeration method has a good track record because it can be handled by the conventional technology and is simple. The exhaust gas after the aeration treatment is generally subjected to a purification treatment using activated carbon or the like.

[0004] As a device for performing aeration treatment, a tower-type aeration treatment device using a packed tower or a multi-stage shelf tower, and an air blowing-type aeration treatment device for blowing air into a tank are used in chemical plants and exhaust gas treatment. There are many uses. Further, as disclosed in Japanese Patent Application Laid-Open No. 2-75391, there has been proposed a device that uses both an air blowing mechanism for blowing air and ultraviolet irradiation.

[0005]

By the way, any of the conventionally known aeration methods or apparatuses perform the aeration process by flooding or bubbling a liquid film to increase the vaporization of contaminants. In order to treat with high efficiency, in the case of a tower type, it is necessary to have a high packed bed or multiple stages, and in the case of an air blowing type, it is necessary to have a multi-tank structure, so that the tower height becomes high, There was a problem that the installation area became large. To solve this problem, JP-A-5-92181 discloses that a tower is divided into a plurality of towers,
It is disclosed that the height of the tower is reduced by devising aeration treatment. However, with this proposal, the installation area increases, and the size of the apparatus cannot be reduced.

In addition, pumped groundwater and the like vary in hardness component, turbidity, and pollutant concentration depending on the pumping location and depth, so that aeration treatment becomes unstable, and in some cases, is blocked by sludge or sand contained in the pumped water. There is also a problem that the wastewater sludge treatment is required in the previous process.

Further, the aeration processing apparatus is often installed in a residential area, in which case, for example, Japanese Patent Application Laid-Open No. 9-9456.
It is necessary to take noise countermeasures as disclosed in Japanese Patent No. In addition, the area of the site is often limited, and the size of the device is required to be reduced, and it is also required that the aeration processing device can be easily moved or mounted on a vehicle. However,
Conventionally known aeration apparatuses have large tower heights and installation areas as described above, and thus have problems such as increased noise control costs, installation costs, moving costs, maintenance costs, and the like.

[0008] The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a highly efficient method without being affected by hardness components such as pumped water containing volatile organic compounds, turbidity and concentration. It is an object of the present invention to provide an aeration treatment method capable of performing aeration treatment, and at the same time, to provide an aeration treatment device suitable for carrying out this method and capable of reducing the size of the device.

[0009]

Means for Solving the Problems To solve the above-mentioned problems, the invention according to claim 1 is an aeration treatment method for aerating water containing a volatile organic compound. A centrifugal wheel with wings is arranged. Then, while rotating the centrifugal rotating disk, the water is injected toward the center of the centrifugal rotating disk, and fine particles are formed by centrifugal force generated by the rotation of the centrifugal rotating disk. In this aeration treatment method, since water such as pumped water containing volatile organic compounds is atomized by centrifugal force and aerated with suction air, it is not affected by hardness components such as pumped water, turbidity and concentration. Thus, the aeration process is performed with high efficiency.

According to a second aspect of the present invention, as an aeration apparatus for aerating water containing a volatile organic compound, at least one aeration chamber is provided, and an opening is provided at the center of the side wall of the aeration chamber. A casing, a centrifugal rotating disk having a plurality of blades disposed at the center of the casing in the aeration chamber so as to face the opening, and driving means for rotating the centrifugal rotating disk via a rotating shaft; An injection pipe that is inserted into the aeration chamber of the casing through the opening and injects the water toward the center of the centrifugal wheel; Then, the aeration process is performed by bringing the air into contact with the air sucked from the opening. In this configuration, since the water injected by the injection pipe is surely atomized by the centrifugal force generated by the rotation of the centrifugal rotating disk and is aerated with the suction air, high-efficiency aeration processing is ensured with a relatively simple configuration. be able to.

Each of the inventions according to claims 3 and 4 provides a preferable specific structure for enhancing the atomization of water by the centrifugal rotating disk of the aeration treatment apparatus according to claim 2. That is, in the case of the invention according to claim 3, the centrifugal wheel is
A main plate fixed to the rotating shaft, a sub-plate having a central opening corresponding to the opening, and a central opening disposed between and parallel to the main plate and the sub-plate and similar to the sub-plate; One or more dispersing plates are provided, and a plurality of blades are respectively curved at predetermined intervals in the circumferential direction and radially between the dispersing plates and the main plate or the auxiliary plate and between adjacent dispersing plates. And is provided so as to extend. In this configuration,
As the water injected by the injection pipe is atomized by the centrifugal force generated by the rotation of the centrifugal rotating disk, the injected water is centrifugally rotated through a number of passages that are subdivided into a main plate, sub-plates, dispersion plates, and blades. The particles are dispersed substantially uniformly over the entire circumference in the width direction (axial direction) of the board and are atomized, whereby the atomization is enhanced.

Further, in the case of the invention according to claim 4, the centrifugal rotating disk includes a main plate fixed to a rotating shaft, and a sub-plate having a central opening corresponding to the opening, and the main plate and the sub-plate. A plurality of wings are provided at predetermined intervals in the circumferential direction and curved in the radial direction between the wings, and a ridge extending in the wing length direction is provided on the surface of each wing in the wing width direction. Are formed at predetermined intervals. With this configuration, when the water injected by the injection pipe is atomized by centrifugal force due to the rotation of the centrifugal rotating disk, the injected water passes through the passage formed by the main plate, the sub plate, and the wings on the wing surface of the wing surface. As a result, the fluid passes while being rectified in the width direction (axial direction) of the centrifugal rotary disk, and is thus dispersed substantially uniformly over the entire circumference in the axial direction to become fine particles.

According to a fifth aspect of the present invention, in the aeration processing apparatus according to the third or fourth aspect, the distal end of the injection pipe is inserted into the centrifugal rotary disc through the central opening of the sub-plate, and the insertion portion is provided. Is provided with a plurality of injection holes along the axial direction of the centrifugal turntable. In this configuration, water is substantially uniformly dispersed and injected over the entire width direction of the centrifugal rotary disk from a plurality of injection holes at the tip of the injection pipe inserted into the centrifugal rotary disk. In addition, the atomization of the injection water can be further reduced.

According to a sixth aspect of the present invention, in the driving means, the peripheral speed of the centrifugal rotary disc is provided so as to be adjustable in accordance with the concentration of the volatile organic compound contained in the liquid. In this configuration, the peripheral speed of the centrifugal wheel is changed and adjusted according to the concentration of the volatile organic compound contained in the liquid, and the gas-liquid ratio is changed accordingly, thereby enabling economical aeration.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an aeration treatment apparatus A according to a first embodiment of the present invention. The aeration treatment apparatus A is for performing aeration treatment after pumping groundwater or the like containing a volatile organic compound. A cylindrical casing 1 is provided.

The casing 1 is composed of two parts which can be separated on a horizontal plane passing through the central axis, and the interior thereof is axially divided by two partition walls 2 and 3 into a suction chamber 4, an aeration chamber 5 and a discharge chamber 6. It is divided into. A suction opening 7 communicating the suction chamber 4 and the aeration chamber 5 is provided at a central portion of the partition 2 which is an inlet side wall of the aeration chamber 5, and a partition 3 which is an outlet side wall of the aeration chamber 5 is provided. A discharge opening 8 communicating the aeration chamber 5 and the discharge chamber 6 is provided at the center.

In the center of the aeration chamber 5, a suction opening 7 is provided.
A centrifugal rotating disk 11 is disposed opposite to the rotating shaft 12, and the centrifugal rotating disk 11 rotates integrally with the rotating shaft 12. As shown in detail in FIGS. 2 and 3, the centrifugal rotating disk 11 includes a main plate 13 fixed to a rotating shaft 12 and a sub-plate 15 having a center opening 14 corresponding to the suction opening 7.
And a plurality (three in the figure) of dispersing plates 17, 17,... Disposed between the main plate 13 and the sub-plate 15 in parallel with them and having the same central opening 16 as the sub-plate 15. Prepared,
Between the dispersing plate 17 and the main plate 13 or the sub plate 15 and between the adjacent dispersing plates 17, 17, a plurality of flat blades 18, 1 each extending in a radially arcuately curved shape.
Are provided at predetermined intervals in the circumferential direction, and the blades 18, 18,... Adjacent to each other in the direction of the rotary shaft 12 are out of phase in the circumferential direction and Are arranged in a zigzag pattern when viewed two-dimensionally from the outside.

A ring-shaped collar 19 is provided around the center opening 14 of the sub-plate 15.
9 is a cylindrical member 20 attached to the suction opening 7 of the partition 2
Is rotatably fitted on the outer peripheral surface of the.

The material of the centrifugal rotary disk 11 is not particularly limited, but a material having a large specific strength is suitable for reducing the consumption of driving energy, and a material having high corrosion resistance and abrasion resistance is preferred. Considering this, light alloys and reinforced plastics are preferred.

The rotary shaft 12 extends through the inside of the casing 1 along the central axis of the casing 1, and is rotatably mounted on the left and right side walls 1a, 1b of the casing 1 via packing seals 21, respectively. Supported. A driving means 22 is connected to one end of the rotating shaft 12 so as to transmit power. Although not shown in detail in the figure, the driving unit 22 includes an actuator such as an electric motor and a speed-reduction mechanism capable of multi-speed or continuous speed change, and according to the concentration of the volatile organic compound contained in the water to be aerated. The rotational speed or the peripheral speed of the centrifugal rotating disk 11 is provided so as to be changeable and adjustable.

On the other hand, an air suction port 26 for introducing air into the suction chamber 4 is provided in the side wall 1a of the casing 1, and an injection port for injecting pumped water containing a volatile organic compound. A pipe 27 passes through the suction chamber 4 of the casing 1 and is inserted into the aeration chamber 5 through the suction opening 7 of the partition wall 2. The distal end of the injection pipe 27 is moved from the center opening 14 of the sub-plate 15 of the centrifugal
Are provided in the inserted portion along the axial direction of the centrifugal rotating disk 11 (in the figure, four injection holes 28, one more than the number of the dispersion plates 17). Have been.

The peripheral wall 1c of the casing 1 is provided with a purified water discharge port 31 for discharging purified water aerated from a lower portion in the aeration chamber 5, and the side wall 1b of the casing 1 is provided with a purified water discharge port 31. An aeration gas discharge port 32 for discharging the aeration gas from the discharge chamber 6 is provided. Although not shown, the aeration gas discharge port 32 is connected to a known exhaust gas treatment device such as an activated carbon adsorption tower via a gas pipe so that the discharged aeration gas is purified and released to the atmosphere. Has become.

Reference numeral 36 denotes an installation member for the casing 1;
Reference numeral denotes a mist eliminator provided in the discharge chamber 6 near the aeration gas discharge port 32, for capturing accompanying mist in the aeration gas passing through the discharge chamber 6.

Next, the operation of the aeration processing apparatus A will be described. When performing the aeration processing using the apparatus A, the centrifugal rotating disk 11 is rotated by the driving means 22 via the rotary shaft 12 while the volatile organic compound is used. The pumped water containing the compound is injected through the injection pipe 27 toward the center of the centrifugal wheel 11. Then, the water is scattered radially around the centrifugal rotating disk 11 in the aeration chamber 5 by the centrifugal force generated by the rotation of the centrifugal rotating disk 11 to be atomized into fine particles, and is aerated through the suction opening 7 from the suction chamber 4 side. By contacting the air sucked into the chamber 5, the volatile organic compound contained in the liquid is aerated. And the purified water that has been aerated is purified water outlet 3
While the aerated gas mixed with the air is discharged from the casing 1 to the outside of the casing 1, the aerated gas flows into the discharge chamber 6 through the discharge opening 8, and the entrained mist is captured by the mist eliminator 37 in the discharge chamber 6. , From the aeration gas discharge port 32 to the exhaust gas treatment device.

According to such aeration treatment, since the pumped water containing the volatile organic compound is atomized by centrifugal force and aerated with the suction air, it is affected by the hardness component, turbidity and concentration of the pumped water. Thus, the aeration process can be performed with high efficiency. In addition, the centrifugal force increases the efficiency of the aeration process, so the size and weight of the device can be reduced. As a result, the installation area can be reduced, and moving and mounting on a vehicle can be simplified. In addition, noise reduction costs, installation costs, maintenance costs, and the like can be reduced. At the same time, the washing effect by the water injection from the injection pipe 27 is added, the clogging by the sludge or sand contained in the liquid does not occur, and the stable aeration treatment can be performed without the necessity of the sand discharge sludge treatment in the previous process. it can.

In addition, the centrifugal turntable 11 has a main plate 13
, The sub-plate 15, the dispersion plate 17, and the blades 18, so that water is injected through the injection pipe 27 in the width direction (axial direction) of the centrifugal rotating disk 11. The particles are substantially uniformly dispersed over the circumference to be finely divided, and the fineness of the fine particles, and hence the efficiency of the aeration treatment, can be improved. In addition, the tip of the injection tube 27 is
5 is inserted into the centrifugal rotating disk 11 through the central opening 14 of the centrifugal rotating disk 11 and has a plurality of injection holes 28, 28,. Since the water injected from each injection hole 28 of the injection pipe 27 can be dispersed substantially uniformly throughout the width of the centrifugal rotary plate 11, the efficiency of the aeration process can be further enhanced.

Further, since the driving means 22 for rotating the centrifugal rotating disk 11 is provided so as to be able to change and adjust the rotation speed or the peripheral speed of the centrifugal rotating disk 11, the concentration of the volatile organic compound contained in the injection water is adjusted. , The gas-liquid ratio can be changed by changing the peripheral speed, and economical aeration can be ensured. In this case, the peripheral speed of the centrifugal rotary disc 11 is 20 m
If it is less than / m, the liquid is not sufficiently atomized and the aeration efficiency is lowered. On the other hand, if it is more than 50 m / s, the drive energy is excessively consumed, so that the range of 20 to 50 m / s is preferable. More preferably, it is 30 to 40 m / s, which makes the liquid fine particles 50 to 100 microns.

Table 1 below shows the results of concentration measurement in experiments in which aeration was performed using the aeration apparatus A.
In this experiment, trichlorethylene was added at 0.455 mg /
l A centrifugal rotary plate 1 with a diameter of 450 mm incorporated in a casing 1 with a diameter of 900 mm and a width of 700 mm containing raw water
Water was injected toward 1, air at 900 Nm ³ / hr was suctioned, and aeration was performed at a gas-liquid ratio of G / L = 100, 150, 200. The water temperature was 20 ° C and the air temperature was 17 ° C.

[0029]

[Table 1] From the experimental results in Table 1, according to the aeration apparatus A according to the first embodiment of the present invention, the concentration of trichloroethylene, which is a volatile organic compound, in purified water is about 10 minutes longer than that in raw water. It can be seen that the ratio can be reduced to 1 or less, and the reduction rate increases as the gas-liquid ratio increases.

In the first embodiment, the blades 18 of the centrifugal rotary disk 11 are arranged such that the blades 18 adjacent to each other in the direction of the rotary shaft 12 are shifted in phase in the circumferential direction so as to be flat from the outside of the centrifugal rotary disk 11. However, the arrangement of the wings 18 is not particularly limited to this. When the gas and liquid simultaneously pass through the centrifugal rotating disk 11, the gravitational difference between the gas and liquid due to the centrifugal force is generated. Any form may be used as long as it prevents drifting and does not hinder gas-liquid centrifugal scattering. In addition, the number of the dispersion plates 17 is increased in proportion to the increase in the number of the distribution plates, so that the aeration efficiency is improved.
May be set in the range of 1 to 4 sheets depending on the interval between them.

FIG. 4 shows an aeration processing apparatus B according to a second embodiment of the present invention. The aeration processing apparatus B includes a cylindrical casing 41, and the inside of the casing 41 includes four partition walls 42. , 43, 44, 45 are axially partitioned into a primary discharge chamber 46, a primary aeration chamber 47, an intake chamber 48, a secondary aeration chamber 49, and a secondary discharge chamber 50.

At the center of the partition 43, which is the inlet side wall of the primary aeration chamber 47, there is provided a primary suction opening 51 communicating the suction chamber 48 and the primary aeration chamber 47.
A primary discharge opening 52 that connects the primary aeration chamber 47 and the primary discharge chamber 46 is provided at the center of the partition 42 that is the outlet side wall of the primary aeration chamber 47. Similarly, a secondary suction opening 53 communicating the suction chamber 48 and the secondary aeration chamber 49 is provided at the center of the partition wall 44, which is an inlet side wall of the secondary aeration chamber 49.
Is provided, and a secondary discharge opening 54 that connects the secondary aeration chamber 49 and the secondary discharge chamber 50 is provided at the center of the partition wall 45 that is the outlet side wall of the secondary aeration chamber 49. I have.

Centrifugal rotating disks 55, 55 are disposed at the center portions of the primary and secondary aeration chambers 47, 49 so as to face the suction openings 51, 53, respectively. Are integrally rotated about a rotation shaft 56. Each centrifugal rotating disk 55 has a main plate 61 fixed to a rotating shaft 56 and a sub-plate 63 having a central opening 62 corresponding to the suction opening 51 or 53, similarly to the centrifugal rotating disk 11 in the first embodiment. A plurality of dispersion plates 65 and 6 disposed between the main plate 61 and the sub-plate 63 in parallel with them and having the same central opening 64 as the sub-plate 63.
, And the dispersion plate 65 and the main plate 61 or the sub plate 6
A plurality of wings (not shown) are provided at predetermined intervals in the circumferential direction and curved in the radial direction, and are provided between the dispersion plates 65 and 65 adjacent to each other.

The rotating shaft 56 is connected to the casing 41.
Extend through the inside of the casing 41 along the central axis of the casing 41, and the left and right side walls 41a, 41 of the casing 41.
1b are rotatably supported via packing seals 71, respectively. Although not shown, a drive means including an actuator such as an electric motor and a deceleration mechanism capable of multi-speed or continuous speed change is connected to one end of the rotary shaft 12 so as to transmit power.

On the other hand, the peripheral wall portion 41c of the casing 41
Is provided with an air suction port 76 for introducing air into the suction chamber 48, and an injection pipe 77 for injecting pumped water containing a volatile organic compound is provided in the casing 4.
, The primary suction opening 5 of the partition wall 43
1 is inserted into the primary aeration chamber 47, and an injection pipe 78 for injecting the primary purified water is also provided in the casing 4.
1 through the suction chamber 48, and the secondary suction opening 5 of the partition wall 44.
3 is inserted into the secondary aeration chamber 49. The tip of each of the injection pipes 77 and 78 is inserted from the center opening 62 of the sub-plate 63 of the centrifugal rotary disk 55 to the inside of the centrifugal rotary disk 55, and the centrifugal rotary disk 55 is inserted into the inserted portion. It has a plurality of injection holes (not shown) along the axial direction.

The primary wall of the casing 41 has a primary purified water discharge port 81 for discharging primary purified water from the lower part of the primary aeration chamber 47 and a lower part of the secondary aeration chamber 49. A secondary purified water discharge port 82 for discharging the secondary purified water that has been more secondary aerated is provided.
The primary purified water discharged from the primary purified water discharge port 81 is stored in a primary purified water tank (not shown), and is then injected into the secondary aeration chamber 49 through the injection pipe 78 by a pump. .

Furthermore, the left and right side walls 4 of the casing 41
1a and 41b have primary or secondary discharge chambers 46 and 5, respectively.
Aeration gas discharge port 83 for discharging aeration gas from 0,
84 are provided. These aeration gas discharge ports 83, 8
Although not shown, 4 is connected to a known exhaust gas treatment device such as an activated carbon adsorption tower via a gas pipe, and purifies exhausted aerated gas and discharges it to the atmosphere. 86 and 87 are primary or secondary discharge chambers 4 respectively.
The mist eliminator is provided near the aeration gas discharge ports 83 and 84 in the insides 6 and 50.

In the aeration treatment apparatus B of the second embodiment, similarly to the aeration treatment apparatus A of the first embodiment, the pumping water containing the volatile organic compound is supplied to the centrifugal rotary disk 5.
Since the particles are atomized by the centrifugal force generated by the rotation of No. 5 and aerated by being brought into contact with the suction air, the aerated process can be performed with high efficiency without being affected by the hardness component, turbidity, concentration, etc. of the pumped water. In particular, the aeration apparatus B of the second embodiment
In the case of, the pumped water is subjected to primary aeration treatment in the primary aeration chamber 47,
After the primary purified water is once discharged from the primary purified water discharge port 81 and stored in the primary purified water tank, it is further discharged to the secondary aeration chamber 49.
Since the secondary aeration process is performed in the inside, the aeration efficiency can be further improved.

Table 2 below shows the results of concentration measurement in experiments in which aeration was performed using the aeration apparatus B.
In this experiment, 1,1,1-trichloroethane was added at 0.1%.
8 mg / l, 0.24 mg / l of trichlorethylene,
Raw water containing 0.44 mg / l of tetrachloroethylene is injected into the primary aeration chamber 47 of the casing 41 having a diameter of 1200 mm and a width of 1100 mm to perform primary aeration, and then the primary purified water is injected into the secondary aeration chamber 49. Secondary aeration was performed. The water temperature was 16 ° C and the air temperature was 12 ° C.

[0040]

[Table 2] From the experimental results in Table 2, according to the aeration apparatus B according to the second embodiment of the present invention, the volatile organic compound 1,
The concentration of 1,1-trichloroethane, trichloroethylene and tetrachloroethylene in the primary purified water can be reduced to about 1/10 compared to that in the raw water, and the concentration in the secondary purified water can be reduced in the primary purified water. It can be seen that this can be further reduced to about one tenth.

The aeration apparatus of the present invention is not limited to the first and second embodiments, but includes various other forms. For example, in each of the above-described embodiments, the centrifugal rotating disks 11 and 55 are configured by the main plates 13 and 61, the auxiliary plates 15 and 63, the dispersion plates 17 and 65, and the plurality of blades 18. Is also good.

That is, as shown in FIGS. 5 and 6, a plurality of wide wings 93 are provided between the main plate 91 and the sub-plate 92 at predetermined intervals in the circumferential direction and curved in the radial direction to extend. And A plurality of (four in the figure) rectangular ridges 96, 96,... Extending in the wing length direction are formed on the surface of each of the wings 93 at predetermined intervals between both sides in the width direction and an intermediate position.

In the case of this configuration, when the pumped water injected toward the center of the centrifugal rotary disk is atomized by the centrifugal force generated by the rotation of the centrifugal rotary disk, the injected water uses the main plate 91 and the sub-plate 9
The passage constituted by the wings 93 and the wings 93 is formed into a ridge 9 on the surface of the wings 93.
By being rectified and passed in the width direction (axial direction) of the centrifugal rotary disk by 6, the particles are substantially uniformly dispersed and atomized over the entire circumference in the axial direction, so that the atomization can be increased. The ridge formed on the surface of the wing 93 may be a ridge 97 having a triangular cross section as shown in FIG. 7 or a ridge 98 having a corrugated shape as shown in FIG. Good.

Further, in the aeration processing apparatus A according to the first embodiment, one aeration chamber 5 is formed in the casing 1, and the suction chamber 4 and the discharge chamber 6 are formed on both sides thereof. In the aeration processing apparatus B according to the embodiment, the casing 4
Although two aeration chambers 47 and 49, discharge chambers 46 and 50, and one suction chamber 48 are formed in 1, the form of the casing in the aeration processing apparatus of the present invention is not limited to these. Although various combinations can be adopted, it is sufficient that at least one aeration chamber is provided in the casing. Further, the rotating shaft for rotating the centrifugal rotating shaft may be arranged not only horizontally but also vertically.

Further, in each of the above-described embodiments, a case has been described in which aeration treatment is performed on pumped water such as groundwater containing a volatile organic compound in the aeration treatment devices A and B. However, the present invention is not limited to pumping and is not limited to pumping. Needless to say, the present invention can be applied to fields such as aeration treatment of various aqueous solutions and oxidation treatment steps in factories.

[0046]

As described above, according to the aeration method of the present invention, water such as pumped water containing a volatile organic compound is atomized by centrifugal force generated by rotation of a centrifugal rotating disk and aerated with suction air. Therefore, the aeration process can be performed with high efficiency without being affected by hardness components such as water pumping, turbidity and concentration.

Further, according to the aeration apparatus of the present invention, it is possible to secure high-efficiency aeration processing with a relatively simple configuration and to reduce the size and weight of the apparatus, thereby reducing the installation area. If possible, it can be easily moved and mounted. At the same time, multiple operations and unitization can be performed, and the degree of freedom is excellent, and further, there is an effect that noise reduction costs, installation costs, maintenance costs, and the like can be reduced.

In particular, according to the third and fourth aspects of the present invention, since the injected water is dispersed substantially uniformly over the entire circumference in the width direction of the centrifugal rotating disk to form fine particles, the fine particles can be enhanced. In addition, the efficiency of the aeration process can be further improved.

According to the fifth aspect of the present invention, water is substantially uniformly dispersed and injected over the entire width direction of the centrifugal rotating disk from the plurality of injection holes at the tip of the injection pipe inserted into the centrifugal rotating disk. Combined with the configuration of the centrifugal rotary disc, the atomization of the injection water can be further reduced, and the efficiency of the aeration process can be further improved.

Further, in the invention according to the sixth aspect, the gas-liquid ratio can be changed by changing and adjusting the peripheral speed of the centrifugal rotary disk in accordance with the concentration of the volatile organic compound contained in the liquid. Also, it is possible to perform an effective aeration process.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an aeration processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a centrifugal wheel of the aeration apparatus.

FIG. 3 is an enlarged sectional view taken along line XX of FIG. 2;

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 5 is a longitudinal sectional view of a part of a centrifugal wheel according to another embodiment.

FIG. 6 is a perspective view of a wing of the centrifugal wheel.

FIG. 7 is a perspective view showing another embodiment of the wing.

FIG. 8 is a perspective view showing another form of the wing.

[Explanation of symbols]

 A, B Aeration treatment device 1, 41 Casing 5 Aeration chamber 7 Suction opening 11, 55 Centrifugal rotary plate 12, 56 Rotating shaft 13, 61, 91 Main plate 14, 16, 62, 64 Central opening 15, 63, 92 Sub Plate 17, 65 Dispersion plate 18, 93 Blade 22 Drive means 27, 77, 78 Injection tube 28 Injection hole 47 Primary aeration chamber 49 Secondary aeration chamber 51 Primary suction opening 53 Secondary suction opening 96, 97, 98 Ridge Department

Claims (6)

[Claims] An aeration treatment method for aeration treatment of water containing a volatile organic compound, wherein a centrifugal rotating disk having a plurality of blades is arranged at a central portion in an aeration chamber, and the centrifugal rotating disk is rotated. An aeration treatment method comprising: injecting the water toward a central portion of a centrifugal rotating disk; forming fine particles by centrifugal force generated by the rotation of the centrifugal rotating disk; 2. An aeration treatment apparatus for aeration treatment of water containing a volatile organic compound, comprising: a casing having at least one aeration chamber and having an opening in a center of a side wall of the aeration chamber; A centrifugal rotating disk having a plurality of blades arranged in the center of the casing in the aeration chamber so as to face the opening; driving means for rotating the centrifugal rotating disk via a rotating shaft; Inserted into the aeration chamber of the casing,
An injection pipe for injecting the water toward the center of the centrifugal rotary disk, wherein the water injected by the injection pipe is atomized by centrifugal force generated by rotation of the centrifugal rotary disk, and brought into contact with air sucked from the opening. An aeration treatment apparatus characterized in that it is configured to perform an aeration treatment by using an aeration method. 3. The centrifugal rotating disk is disposed in parallel with a main plate fixed to a rotating shaft, a sub-plate having a central opening corresponding to the opening, and between the main plate and the sub-plate. And one or more dispersing plates having a central opening similar to that of the sub-distributing plate, and a plurality of blades are formed between the dispersing plate and the main plate or the sub-distributing plate and between adjacent dispersing plates. The aeration processing apparatus according to claim 2, wherein the aeration processing apparatus is provided so as to extend at predetermined intervals in the direction and curved in the radial direction. 4. The centrifugal rotating disk includes a main plate fixed to a rotating shaft and a sub plate having a central opening corresponding to the opening, and a plurality of blades are provided between the main plate and the sub plate. A plurality of ridges extending in the blade length direction are formed at predetermined intervals in the blade width direction on the surface of each of the wings. The aeration apparatus according to claim 2. 5. The distal end of the injection tube is inserted into the centrifugal rotating disk through the central opening of the sub-plate, and a plurality of injection holes are formed in the inserted portion along the axial direction of the centrifugal rotating disk. The aeration apparatus according to claim 3, wherein the apparatus comprises: 6. The method according to claim 2, wherein the driving means is provided so as to be able to change and adjust the peripheral speed of the centrifugal rotating disk in accordance with the concentration of the volatile organic compound contained in the liquid. The aeration treatment device according to claim 1.