JP4868307B2 - Water purification system and water purification method - Google Patents

Description

The present invention relates to purification of water quality in general water areas such as rivers, ponds, lakes, and brackish water areas, and more particularly to a system and method for purifying water quality by increasing the amount of dissolved oxygen in the water area .

In the conventional improvement of water quality, air is generally guided to the bottom of the water with an air supply pipe, and bubbles are sent into the water from the discharge port provided in the air supply pipe to increase dissolved oxygen concentration in the water, thereby performing aerobic biological purification. The method to make is taken.
JP-A-11-342396 Japanese Patent Laid-Open No. 2003-080283 JP 2005-246351 A JP 2005-262200 A

However, in the above-mentioned method, since most of the bubbles blown out from the discharge port have a diameter of about 1 mm, the rising speed of the bubbles is high, and the deaeration advances rather than the bubbles staying in the water area and becoming dissolved oxygen. The effect is low. In addition, since the air bubbles blown out from the discharge port rise almost vertically, it is not possible to purify a wide range of water areas, and it is also one idea to increase the discharge port. This will increase the cost burden.

As a countermeasure for solving the above problem, it is conceivable to send the air that has been sent in to the water after being refined. As means for refining the air, the air is self-sucked by pumping water to the unit (aspirator effect), and the self-sucked air is made fine and ejected into the water. However, when this unit is installed at a depth of 10 m or more, it is impossible to suck the air guided by the conduit from the water surface as it is, and the purpose is achieved by pumping the air with a compressor. This method requires equipment and power costs in addition to air pressure.

The present invention is intended to solve such a conventional problem and aims to purify water quality by increasing the amount of dissolved oxygen in the water area, and further to improve the environment by the growth of aerobic bacteria. It is intended.

The water purification system of the present invention which attempts to solve the above-mentioned conventional problems produces fine bubble-containing water containing fine bubbles in a pressurized state of 200 nm to 5 μm in size, and uses the fine bubble-containing water as bottom water. The amount of dissolved oxygen in the water area is increased by releasing it into the water in the layer, thereby purifying the water quality and improving the environment.

  The invention according to claim 1 is provided with a water intake pump 4, a water storage tank 6, a fine bubble-containing water production device 8, and a water supply pump 10 on a floating structure such as a fence or on the land, a water intake, A water pipe 12 and a discharge port 14 are installed in the water, and at least a water intake pump 4 for taking water in the water area, a water storage tank 6 for storing the taken water, and fine bubbles for containing fine bubbles in the water An air compressor (gas compressor) 16 constituting the water-containing water production apparatus 8, a compressed gas storage tank 18 for storing gas compressed by the air compressor, and a compressed gas stored in the compressed gas storage tank 18 are controlled. A means for containing fine bubbles in water comprising a regulator (pressure reducing valve) 22 for sending air to the foam outlet 20, a foam outlet 20 for sending fine bubbles into the taken water, and water containing fine bubbles The A water pump 10 that supplies water to the bottom water layer of the water area, a water supply pipe 12 that guides the water containing fine bubbles to the bottom water layer of the water area, and water that contains fine bubbles formed in the discharge port 14 is submerged in the bottom water layer of the water area. The compressed gas stored in the compressed gas storage tank 18, which stores the gas compressed by the air compressor, is controlled by a regulator (pressure reducing valve) 22, and the taken water is stored. By supplying air to the foam outlet 20 arranged in the bottom layer of the water storage tank 6, a craze is generated in the polymer resin film arranged as a gas permeable material in the gas transmission part of the foam outlet 20. Fine bubbles containing fine bubbles in a pressurized state of 200 nm to 5 μm size, which is obtained by forcibly permeating the compressed gas into the taken-in water under the control of the permeation amount in the breathable film. A water purification system that discharges contained water in a bottom layer of a water area.

In the present invention, the means for causing water to contain fine bubbles is that a gas permeable material is constituted by a gas permeable film formed by forming a craze on a polymer resin film, and the compressed gas filled in the gas storage section is ventilated. By forcibly permeating the porous film, fine bubbles in a compressed state with a compressed gas size of 200 nm to 5 μm are gradually released into water under the control of the permeation amount by the breathable film.

As a discharge means for releasing water containing fine bubbles in a pressurized state into the water in the bottom water layer, an existing water pump and water pipe are used. In the present invention, the water pipe is used for air supply. The fine bubbles in a pressurized state of 200 nm to 5 μm size contained in the water containing fine bubbles are not used, and the bubbles do not coalesce. There is no need to specify the material of the water pipe with the purpose of preventing lifting as in the conventional case, and when attaching the weight to the water pipe, when the water pipe is enforced on the bottom of the water without generating a cavity, Therefore, the enforcement cost is set low.

  In the first aspect of the present invention, means for causing water to contain fine bubbles includes at least an air compressor (a gas compressor), a compressed gas storage tank for storing a gas compressed by the air compressor, and the compressed gas. It is comprised by the foam outlet 20 which discharge | releases the compressed gas with which the storage tank was filled in the state of a fine bubble to water. The gas permeation transition at the foam outlet 20 is determined by arranging an air permeable film formed by forming a craze on a polymer resin film as a gas permeable material in a gas permeable portion provided at the foam outlet 20. Under the control of the permeation amount in the film, the compressed gas is gradually released little by little, so that the compressed air is filled in the compressed gas storage tank by the air compressor without always operating the air compressor. The air compressor is activated as necessary by sensing the pressure reduction in the compressed gas storage tank using the above, etc., and a certain amount of compressed gas is filled in the compressed gas storage tank, and the air compressor is stationary.

  The invention described in claim 2 is provided with a water intake pump 4, a water storage tank 6, a fine bubble-containing water production device 8, and a water supply pump 10 on a floating structure such as a fence or on the land, a water intake, A water pipe 12 and a discharge port 14 are installed in the water, and at least a water intake pump 4 for taking water in the water area, a water storage tank 6 for storing the taken water, and fine bubbles for containing fine bubbles in the water Means for containing fine bubbles in water comprising an air compressor (gas compressor) 16 constituting the water-containing production apparatus 8 and a foam outlet 20 for sending fine bubbles into the taken water; A water pump 10 that feeds the contained water to the bottom water layer of the water area, a water feed pipe 12 that guides the water containing the fine bubbles to the bottom water layer of the water area, and water containing fine bubbles constituted by the discharge port 14 is the bottom water of the water area. Release hand released into water in the bed The gas permeable portion of the foam outlet 20 is sent to the foam outlet 20 disposed in the bottom layer of the water storage tank 6 in which the taken-in water is stored. 200 nm to which the compressed gas is forcibly permeated into the taken-in water under the control of the permeation amount in a breathable film formed as a gas permeable material and formed by crazing the polymer resin film. The water purification system is characterized in that fine bubble-containing water containing fine bubbles in a pressurized state having a size of 5 μm is discharged from the bottom layer of the water area.

The compressed gas generated by the air compressor as the pressurized gas is reduced in pressure through a regulator (pressure reducing valve), and is fine in a pressurized state of 200 nm to 5 μm size under the control of the permeation amount by the breathable film. Bubbles are gradually released into the water.

The fine bubble-containing water used in the present invention is fine bubble-containing water containing fine bubbles in a pressurized state of 200 nm to 5 μm, and the fine bubbles in a pressurized state of this size In particular, since the fine shape is maintained without coalescence of the bubbles in the water pipe, the content of the fine bubbles is not reduced even when the water pipe is used for long distance transfer.

In the conventional water containing fine bubbles, even if the contained bubbles are fine bubbles with a diameter of about 0.01 mm at the minimum, many of the bubbles generated at the same time have a size larger than that, Bubbles coalesced in the water pipe and become a large bubble and are frequently released into the water area, sometimes staying in the water pipe, and the long distance transfer of water containing fine bubbles has not been done efficiently .

In the present invention, by containing bubbles in a pressurized state of 200 nm to 5 μm in water, the bubbles are dissolved and mixed in water, and the coalescence of the bubbles is prevented, thereby preventing the fine bubbles in the water containing fine bubbles. A long-distance transfer of water containing fine bubbles without bubbles being reduced is performed.

The fine bubbles in a pressurized state of 200 nm to 5 μm size are dissolved or mixed in water in the state of fine bubbles in water, and have the property of staying in water while drifting. By releasing water containing fine bubbles in a pressurized state into the bottom water layer, the total dissolved oxygen concentration from a wide range of water bottom to the water surface can be gradually increased over a long period of time. Water quality purification can be performed steadily and efficiently in a natural manner without causing a sudden change in water quality.

Embodiments of the present invention will be described with reference to the drawings. Of course, the present invention is not limited to the following embodiments.

The fine bubble-containing water production unit of the water purification system of the present invention is installed on a floating structure such as a dredge on the water, or, as shown in FIG. 1, on the land, a water intake pump 4, a water storage tank 6, and a fine bubble-containing water A water production device 8 and a water supply pump 10 are installed, and a water intake port, a water supply pipe 12, and a discharge port 14 are installed in the water , and at least water intake pump 4 for taking water is taken in. A water storage tank 6 for storing fresh water, and a fine bubble-containing water production apparatus 8 for containing fine bubbles in a pressurized state in the stored water. The fine bubble-containing water production apparatus 8 is stored in an air compressor ( gas compressor) 16, a tank 18 for storing gas compressed by the air compressor, and a compressed gas storage tank 18 as shown in FIG. And a regulator (pressure reducing valve) 22 for controlling the compressed gas to be supplied to the foam outlet 20 and the foam outlet 20, and adding to the water taken into the storage tank 6 by the fine bubble-containing water production apparatus 8. Contains fine bubbles in pressure. The discharge means for releasing the water containing fine bubbles in a pressurized state into the water in the bottom water layer is a water feed pump 10 for feeding the water containing the fine bubbles to the bottom water layer, and the water containing the fine bubbles in the bottom water layer. The water pipe 12 is provided with a plurality of outlets 14 for discharging the water containing fine bubbles in a pressurized state into the water in the bottom water layer. This is a system for purifying water quality by increasing the amount of dissolved oxygen.

Means for containing fine bubbles in water, a gas storage portion compressed gas is filled as a gas under pressure, gas permeation unit having a gas permeable material which releases compressed gas filled in the gas storage unit And the gas permeable material is constituted by a breathable film formed by forming a craze on a polymer resin film, and the compressed gas filled in the gas storage section is permeated by the breathable film. Under the control of the amount, fine bubbles in a pressurized state of 200 nm to 5 μm are gradually released into water by forcibly permeating.

Water containing fine bubbles in a pressurized state having a size of 200 nm to 5 μm is transferred to a water pipe using a water pump. The water pipe is a derivative for guiding water containing fine bubbles in a pressurized state of 200 nm to 5 μm size to the bottom water layer , and a plurality of discharge holes are provided in the portion provided in the bottom water layer. The water containing fine bubbles in a pressurized state of 200 nm to 5 μm in size is released into the water in the bottom water layer, so that the dissolved oxygen amount in the water area is increased and the water quality can be purified. .

[Microbubble generator]
As shown in FIG. 2, a fine bubble generator 8 that generates fine bubbles in a pressurized state of about 200 nm to 5 μm in water includes an air compressor (air compressor) 16, a compressed air storage tank 18, and bubbles. It is comprised from the spout 20. Air compressed by an air compressor (air compressor) 16 is stored in the compressed air storage tank 18 is fed Regyureta through (pressure reducing valve) 22 to the bubble ejection port 20.

<Bubble spout>
Compressed air stored in the compressed air storage tank 18 is a fine void (communication) constituting a craze generated in a polymer resin film, which is mounted as a gas permeable material at a foam outlet 20 as shown in FIG. The hole is expanded and forced to permeate. On the other hand, the compressed air gradually becomes fine bubbles while the permeation amount is limited by the fine voids of the void, and dissolves in water or is mixed to produce fine bubble-containing water enriched in dissolved oxygen concentration.

<Pressurized fine bubbles>
The fact that the pressurized fine bubbles are easily fused into the liquid is expressed by the following equation.
w = kP
In this equation, w is the mass of the gas dissolved in the liquid, P is the pressure of the gas, and k is a proportionality constant. From this, it can be seen that the mass of the dissolved gas is directly proportional to the pressure of the gas. That is, when a gas is dissolved in a liquid, the more the gas that is in contact with the liquid is, the more gas is dissolved in the liquid.

The pressurized fine bubbles used in the present invention are fine bubbles in a pressurized state of about 200 nm to 5 μm, and even those that can be visually observed are small in buoyancy and rise while drifting in water. Therefore, when it rises, it is released into the atmosphere without causing overflow in the water area. On the other hand , if the bubbles are in a nano-sized pressurized state that is so fine as to be invisible, the dissolved oxygen amount in the water area is stabilized in a rich state by being dissolved or mixed in water and staying in water.

<Bubble size>
The size of the foam used in the present invention is gradually dissolved into water or mixed into water while the permeation amount is limited by the fine voids (communication holes) constituting the craze generated in the polymer resin film. It is a small bubble whose diameter is as small as 200 nm to 5 μm, and it is easy to increase the amount of oxygen contained in the water. You can also. In addition, it has an action of gently stirring water in water and a sterilizing action.

<Foam components>
The foam component used in the present invention, for example, compresses air and forcibly permeates the permeation material to generate fine bubbles, so that components such as nitrogen and oxygen present in the air are the main components. However, since purified carbon dioxide, oxygen, or the like can be used alone or in combination, water quality suitable for the situation can be improved.

<Material of polymer resin film>
The polymer resin used as the material of the polymer resin film is not particularly limited as long as it is a thermoplastic resin capable of forming a film or a sheet. Examples of such thermoplastic resins include polyolefins, polyesters, polyamides, styrene resins, polycarbonates, halogen-containing thermoplastic resins, and nitrile resins.

Among these thermoplastic resins, it is preferable to use polyolefins, polyesters, styrene resins, and halogen-containing thermoplastic resins from the viewpoints of moldability to films and sheets and economy. These thermoplastic resins may be used alone, combined and used as a composition, or may be blended with another polymer resin, and two or more types of resins may be multilayered. It may be used.

<Craze> The craze generated by crazing the polymer resin film is basically the same as that disclosed in Japanese Patent No. 315658, and the molecular orientation of the polymer resin film is The width is generally 0.5 to 100 μm, preferably 1 to 50 μm, approximately parallel to the direction. The ratio of the number of crazes penetrating in the thickness direction of the film is 10% or more, preferably 20% or more, particularly preferably 40% or more, and penetrating with respect to the number of all crazes. When the ratio is less than the above range, it is difficult to obtain sufficient air permeability.

The craze is formed in a direction substantially parallel to the direction of molecular orientation because the craze is formed by pulling in a direction perpendicular to the direction of molecular chain orientation, and the craze is formed in a direction perpendicular to the direction of molecular chain orientation. This is because it is difficult to form. The craze mentioned here includes a surface craze appearing on the surface of the polymer resin film and an internal craze generated inside, and refers to a region having a fine crack-like pattern.

This craze is composed of molecular bundles (fibrils) and voids, and the gas permeability of various gases is generated in this portion.

<Craze gas permeation performance>
Although the gas permeation performance of the craze varies depending on the type of resin used, for example, when a homopolymer of polyvinylidene fluoride is used, the gas permeability of oxygen and nitrogen gas is generally 0.3 to 100,000 × 10 ⁴ cm ^3. / M ² · 24 hr · atm in the range of moisture permeability, generally 10 to 100,000 × 10 ⁴ g / m ² · 24 hr, and tensile strength in general 5 to 50 MPa, preferably 6 -50 MPa, particularly preferably in the range of 7.5-50 MPa.

Schematic explaining the structure of the water purification system of this invention. Schematic explaining the structure of the fine bubble containing water manufacturing apparatus.

Explanation of symbols

2 Water quality purification system 4 Water intake pump 6 Water storage tank 8 Water production equipment containing fine bubbles 10 Water pump 12 Water supply pipe 14 Discharge port 16 Air compressor ( gas compressor)
18 Compressed gas storage tank 20 Foam outlet 22 Regulator (pressure reducing valve)

Claims (2)

  A water intake pump 4, a water storage tank 6, a fine bubble-containing water production device 8, and a water supply pump 10 are installed on a floating structure such as a dredger or land, and a water intake, a water supply pipe 12, and a discharge port 14 are placed underwater. And at least an intake pump 4 for taking water in the water area, a water storage tank 6 for storing the taken water, and an air constituting the fine bubble-containing water production apparatus 8 for containing fine bubbles in the water. A compressor (gas compressor) 16, a compressed gas storage tank 18 that stores gas compressed by an air compressor, and a regulator that controls the compressed gas stored in the compressed gas storage tank 18 and sends it to the foam outlet 20. (Pressure reducing valve) 22 and means for containing fine bubbles in water composed of a foam jet 20 for sending fine bubbles into the taken water, and water containing fine bubbles is sent to the bottom water layer of the water area. Sending It comprises a pump 10, a water supply pipe 12 that guides water containing fine bubbles to the bottom water layer of the water area, and a discharge means that discharges water containing fine air bubbles into the water in the bottom water layer of the water area. The compressed gas filled in the compressed gas storage tank 18 for storing the gas compressed by the air compressor is controlled by the regulator (pressure reducing valve) 22 and is supplied to the bubble outlet 20, whereby the bubble outlet The compressed gas is forcibly permeated into the taken-in water under the control of the amount of permeation in a breathable film formed as a gas permeable material in a gas permeable portion of 20 and formed by craze formation on a polymer resin film. A water purification system characterized in that fine bubble-containing water containing fine bubbles in a pressurized state of 200 nm to 5 μm in size is discharged from the bottom layer of the water area.   A water intake pump 4, a water storage tank 6, a fine bubble-containing water production device 8, and a water supply pump 10 are installed on a floating structure such as a dredger or land, and a water intake, a water supply pipe 12, and a discharge port 14 are placed underwater. And at least an intake pump 4 for taking water in the water area, a water storage tank 6 for storing the taken water, and an air constituting the fine bubble-containing water production apparatus 8 for containing fine bubbles in the water. Means for containing fine bubbles in water consisting of a compressor (gas compressor) 16 and a foam outlet 20 for sending fine bubbles into the taken water, and water containing fine bubbles to the bottom water layer of the water area A water pump 10 that feeds water, a water supply pipe 12 that guides the water containing fine bubbles to the bottom water layer of the water area, and a discharge that discharges water containing fine bubbles formed in the discharge port 14 into the water in the bottom water layer of the water area. Consists of air conditioning A gas permeable film formed by craze formation on a polymer resin film disposed as a gas permeable material in the gas permeable portion of the foam jet port 20 by sending the gas compressed by the lesser to the foam jet port 20 Under control of the amount of permeation in the water, the compressed gas is forcibly permeated into the taken-in water, and the fine bubble-containing water containing fine bubbles in a pressurized state of 200 nm to 5 μm size is used as water in the water area. A water purification system characterized by being discharged in the bottom layer.

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