JP2003225690A - Water cleaning method and apparatus using fine air bubble and carbon fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for industrially cleaning sewage of rivers, ponds, dams, lakes, sewer, industrial waste water, living waste water, etc. <P>SOLUTION: The method comprises immersing strands and/or structure bodies of carbonaceous fibers and carbon fibers in water and diffusing fine air bubbles over the entire surface by using air diffusion pipes arranged over the entire surface on the bottom of a water tank in treating the water in the water tank, in which the average diameter of the fine air bubbles is preferably 1 to 5 mm. The water treatment apparatus of an industrial scale is arranged with the air diffusion pipes 19 having a plurality of pores over the entire surface of the bottom of the water tank, is arranged with the strands 14 and/or structure bodies in the water tank and has at least a raw water inflow port 21 and a treated water outflow port 22. More preferably the air diffusion pipes are membranes having slit pores and the strands and/or structure bodies are attached to fiber loading units 20 which are arranged in the treated water tank as shown in Figure 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial scale method and apparatus for purifying sewage such as rivers, ponds, dams, lakes, sewage, industrial wastewater and domestic wastewater. More specifically, in the water treatment in the water tank, the carbonaceous fiber and the carbon fiber as a biofilm carrier are immersed in the sewage that has flown into or injected into the water tank, and fine bubbles are generated by using an air diffuser arranged at the bottom of the water tank. BO in waste water by aeration
The present invention relates to an industrial scale water treatment method for removing pollutants such as D and SS components. In addition, an air diffuser having a large number of holes that diffuses the sewage that has flowed into or injected into the water tank is entirely arranged at the bottom of the water tank, and carbonaceous fibers and carbon fibers as biofilm carriers are installed in the water tank on an industrial scale. Regarding a processing device. Further, a specific air diffusing pipe is installed at the bottom of the water tank so that it diffuses completely into the sewage that has flowed into or injected into the water tank, and the carbonaceous fiber and the fiber mounting unit independent of the water tank to which the carbon fiber is attached Industrial scale water treatment equipment located at.

[0002]

2. Description of the Related Art Conventionally, an industrial scale method for purifying polluted water such as rivers, ponds, lakes, marshes, sewage, factory drainage, domestic drainage, etc., is to put the polluted water in a water tank and blow air to aerate the bubbles. And water are brought into contact with each other, and the water is vigorously swirled and stirred to keep the dissolved oxygen concentration in water uniform and at a predetermined amount, thereby aerobic bacteria and microorganisms are propagated and proliferated in water to produce BOD and COD components. And then the treated water is transferred to a separate settling tank and S
There is an activated sludge method in which suspended solids such as S components are allowed to settle to separate treated water with a clear supernatant. Further, while maintaining the dissolved oxygen concentration in the water at a predetermined amount by aerating the air in the water tank containing the sewage, a synthetic resin composed of nylon, polyvinylidene chloride, polyacrylonitrile, etc. arranged in the water as a biofilm carrier. A fibrous substance alone or a tissue body composed of a knitted or non-woven fabric thereof is immersed, and bacteria, aerobic bacteria, microorganisms or micro organisms are propagated and propagated on the carrier surface to consume nutrients in water and BOD,
There is a biofilm contact oxidation method in which purified water is prepared by treating treated water with a reduced COD component and then advancing it to a separately settling tank to sediment and separate the SS component that is a suspended substance.

Particularly, in recent years, regarding the biofilm catalytic oxidation method,
JP-A-8-266184, JP-A-8-29019
No. 1, JP-A-10-239767, JP-A No. 1
1-90472, carbonaceous fibers or carbon fibers are effective as a biofilm carrier used for water purification, and these carbonaceous fibers or carbon fiber strands or woven fabrics, knits, strings, A rope or a tissue body processed into a more specific form is placed in water, and in particular, by rocking, more aerobic bacteria and microorganisms are fixed on the fiber to remove BOD, COD, SS components, etc. in water. It is known that water can be reduced to purify water.

According to the above-mentioned publication, carbonaceous fibers and carbon fibers obtained from starting materials such as acrylic fibers, pitch and mesophase pitch, phenolic fibers and cellulose fibers are more microbial than films and fibers made from synthetic resins. Is described as a fairly effective biofilm carrier as it is faster and adheres more.

[0005]

However, the known activated sludge method and the known biofilm catalytic oxidation method using fibers made of synthetic resin in the known water treatment tanks use BO in wastewater in a single water treatment tank.
Although it has the effect of reducing the D and COD components, it is difficult to sufficiently remove the SS component in the water treatment tank. This is because in the activated sludge method, sludge floating in water becomes the SS component,
Also, in the catalytic oxidation method using synthetic fibers, aerobic bacteria and microorganisms attached to the fibers are easily separated and become SS components. Therefore, a settling tank is installed separately from the water treatment tank to take out clean water by sedimentation and separation, but there is a problem that the economic burden on the land area and equipment used is large, and it takes time for water treatment. It was On the other hand, in the catalytic oxidation method using carbonaceous fibers and carbon fibers as the biofilm carrier, aerobic bacteria and microorganisms adhere to the fibers as described above, and in particular, the constituent monofilaments become disjointed. The sludge adheres well in the state of rocking in water and almost no peeling occurs, so SS components in water can be effectively removed, and a sedimentation tank is not necessary or an auxiliary small sedimentation tank is sufficient. There are features. In these industrial methods, as aeration performed in order to maintain a high dissolved oxygen amount in the wastewater in order to rapidly grow and fix aerobic bacteria and microorganisms on the fiber, a water tank containing the fiber and wastewater,
A method in which a large amount of large air bubbles are ejected from a number of air outlets provided in several places to aerate, and the part in which the fibers are immersed and the part to be aerated are separated, and first aeration is performed to increase the dissolved oxygen concentration in water. Then, a swirling flow method is performed in which the waste water is brought into contact with the dipped fibers. However, the method of aerating a large amount of large bubbles ejected from air outlets provided at several locations not only enormously consumes power for aeration, but also causes the fibers to be cut due to intense movement of water due to aeration. However, there has been a problem that twisting or entanglement occurs and the fixing efficiency of aerobic bacteria and microorganisms is extremely poor. In addition, the swirling flow method for separating the fiber-immersed portion and the aerated portion has a problem in that the equipment is large and is economically disadvantageous as compared with the method in which it is performed in one water tank. Further, in the industrial catalytic oxidation method using carbon fiber or carbon fiber as a biofilm carrier, the fiber to which a large amount of sludge of aerobic bacteria or microorganisms, which has increased over time, is fixed, is used as a new carbon fiber or Replacing with carbon fiber is necessary for stable reduction of SS component, but the fiber to which sludge of aerobic bacteria and microorganisms has adhered is extremely affected by the fact that the weight of the fiber after being taken out from the water tank is hydrated. Since it is heavy, there is a problem that the replacement work requires a lot of labor and a long time.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to treat wastewater such as rivers, ponds, lakes, seas, sewage, industrial wastewater and domestic wastewater with carbon fibers and / or strands of carbon fibers. Using the tissue as a biofilm carrier, the water treatment is carried out by catalytic oxidation in a size of an industrial scale performed in a single water tank having a water tank volume of 10 m ³ or more, and sludge of aerobic bacteria or microorganisms is treated with strands of the fiber or / Another object of the present invention is to provide a method and an apparatus for economically and efficiently removing BOD and SS components by fixing them uniformly on the tissue without using a sedimentation tank. Another object of the present invention is to provide a device suitable for easily taking out a plurality of the fibers to which sludge of aerobic bacteria or microorganisms has adhered from a water tank on an industrial scale and quickly replacing the fibers with new fibers.

[0007]

Means for Solving the Problems As a result of intensive investigations by the present inventors in order to achieve the above-mentioned object, the carbonaceous fibers, strands of carbon fibers, woven fabrics, knitted fabrics, strings, ropes and more special forms were processed. In the conventional method which is carried out on an industrial scale using a single water tank having a water tank volume of 10 m ³ or more for immersing a tissue body in the water tank and aerating, the aeration causes uneven distribution of sewage in the water tank, and a plurality of water tanks are installed by swirling. Since many strands of fibers and tissues are twisted or twisted, the constituent single fibers cannot be oscillated in a disjointed state and the effect of sludge sticking to the fibers is reduced, and the amount of sticking is unevenly distributed or excessive. There was a phenomenon that the adhered part of the sludge appeared and the sludge peeled from there.
Therefore, the strands of fibers and / or tissue and sewage are put in a water tank, and an air diffuser is placed over the bottom of the water tank to disperse fine bubbles, particularly bubbles of a specific size, for water treatment. However, without twisting or twisting with a plurality of said fibers, the single fibers oscillate in a disjointed state and the sludge is fixed relatively evenly and uniformly, and the fixed sludge does not drop off,
It has been found that the OD and SS components can be greatly reduced, and further, the dissolved oxygen concentration in water can be quickly and effectively increased with less power consumption due to the fine bubbles. Also,
An air diffusing tube having a plurality of holes was placed all over the bottom of the water tank, and the carbonaceous fibers and strands of carbon fibers and / or water in the vicinity thereof and water in the vicinity thereof were arranged to be finely moved by fine bubbles generated from the air diffusing tube. A device including a water treatment tank is a device that can stably reduce BOD and SS components in water over a long period of time. Especially, when a membrane-type air diffuser with slit holes is used, specific uniform fine bubbles are generated. It was found that the device is more effective because it can diffuse air. Further, in the above-mentioned apparatus, the water treatment apparatus in which a plurality of carbonaceous fibers and strands of carbon fibers and / or a plurality of tissue bodies are attached to an independent fiber mounting unit allows sludge of aerobic bacteria and microorganisms to be relatively evenly distributed on the fibers. Not only does it stick, but SS components can be stable and extremely reduced for a long time,
Further, the present invention has been found to be an apparatus having extremely easy operability because the fiber to which the sludge is fixed can be exchanged with a new carbonaceous fiber and a new carbon fiber for each fiber mounting unit.

That is, according to the present invention, in the water treatment in the water tank, the carbonaceous fibers and the strands of carbon fibers and / or the structure are immersed, and fine air bubbles are entirely overlaid by using an air diffuser arranged at the bottom of the water tank. The aquarium volume that diffuses is 10
It consists of an industrial scale water treatment method using a single water tank of m ³ or more.

The fine bubbles have an average diameter of 1 to 5 mm.

According to the present invention, an air diffuser having a plurality of holes is entirely arranged at the bottom of the water tank, and carbonaceous fibers and carbon fiber strands and / or tissue bodies are arranged in the water tank. It is an industrial-scale water treatment device using a single water tank having an outlet water tank volume of 10 m ³ or more.

In the water treatment apparatus, the air diffuser is a membrane having a plurality of slit holes, and the carbonaceous fibers and carbon fiber strands and / or tissue bodies are attached to the fiber mounting unit. .

The fiber mounting unit is characterized in that the carbonaceous fibers and the strands of carbon fibers are mounted in a horizontal direction with respect to the water surface.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The practice of the present invention will be described in detail below.

Carbonaceous Fiber and Carbon Fiber The carbonaceous fiber and carbon fiber used in the present invention include acrylic fiber, pitch, and mesoface pitch in an oxidizing gas atmosphere such as oxygen in a known furnace such as a heating furnace. Known oxides of polyacrylonitrile type (PAN type), pitch type, mesophase type, and phenol type, which are obtained by firing oxidized fiber obtained by oxidation using and a fiber using phenol resin in an inert gas at 600 ° C. or higher, A fiber having a specific gravity of 1.5 to 1.8, a diameter of 5 to 10 micrometers, a tensile strength of 500 MPa or more, and a tensile elastic modulus of 50 GPa or more. The carbonaceous fiber in the present invention has a carbon content of 75 to less than 90% by weight, and
The carbon fiber has a carbon content of 90% by weight or more.
In the following description, the carbonaceous fiber and the carbon fiber are collectively referred to as carbon fiber.

The carbon fiber strand in the present invention is
The microorganisms adhere to increase the weight, friction and wear between the single fibers caused by the movement of the bubbles and water caused by the movement of the carbon fibers, and the carbon fibers and the coated portion at the attachment site of the carbon fibers. In consideration of damage to the carbon fiber due to friction with the fixing material, abrasion, bending action, etc., it is preferable that the tensile strength is 800 MPa or more and the tensile elastic modulus is 80 GPa or more. In order to fix a large amount of microorganisms between the surface and the single fiber, it is preferable that the number of single fibers to be formed is 3,000 to 100,000. In the present invention, a strand having a larger number of constituent fibers by bundling strands having a smaller number of single fibers can also be used as the strand. If the number of those components is less than 3,000, it is not preferable because a large number of components have to be used to secure the amount to be attached to the water treatment tank, and the attachment work requires a lot of time and labor. . When the number is 100,000 or more, the gaps between the monofilaments constituting the carbon fiber strands become narrower and denser, so that the amount of aerobic bacteria or microorganisms fixed sludge relative to the amount of the carbon fibers used is the number of monofilament constituents. Is extremely smaller than that of small strands, and it becomes difficult for water to enter and leave the sludge, which causes anaerobic bacteria to grow and cause odor, which is not preferable. Further, it is desirable that the number of twists of the strand is as small as possible in order to cause the single fibers to oscillate in water. It is preferably 1.0 or less per 1 m of the length of the strand.

In the carbon fiber structure of the present invention, the number of constituent strands of the carbon fiber is 3,000 to 30,000.
A woven fabric, a knitted fabric, a string, a rope or a more special form processed by using 0 strands can be used, for example, a known structure described in JP-A-8-290191 can be used, but preferably, the carbon fiber is used for the trunk. Alternatively, it is a tissue body in which a plurality of strands of carbon fiber having a length of several to several tens of cm are attached to a branch having a different angle from the trunk by using a string or rope of synthetic fiber. The tissue is diffused over the entire surface using fine bubbles,
The constituent monofilaments of the carbon fibers attached in a branch shape are disjointed, and the microorganisms are evenly adhered to the carbon fibers attached to a plurality of them, so that the SS component can be reduced well.

Both the strands of the carbon fiber and the tissue of the present invention exhibit an excellent water treatment effect by aerating the fine air bubbles of the present invention over the entire surface, but the tissue is obtained by processing the strands. The processing cost is high because it is made, and the broken monofilament floats in the water when used for water treatment because it contains defects such as damage and cutting of the monofilament due to the processing, and a filter etc. is prepared for its removal. It is more preferable to use the strand on an industrial scale, considering that it must be done. In that case, it is effective to use the strands and the tissue having a similar shape to the tissue or a tissue partially processed with a synthetic fiber or the like in order to keep the single fibers constituting the strands apart. It is preferable because it exists.

Fine Bubbles The fine bubbles of the present invention are formed by sending air into a diffusing tube arranged in a water tank and blowing air into the water through fine holes on the surface of the diffusing tube. The shape of the fine bubbles differs depending on the shape of the hole of the diffuser tube, the shape of the slit, the movement of water, etc., but it does not necessarily have to be a true sphere.

The size of the fine bubbles is such that the bubbles rapidly increase the amount of dissolved oxygen in the water, move the water evenly and appropriately, and further retain the biofilm carrier of the carbon fiber even when the bubbles contact. It is preferable that the average diameter is 1 to 5 mm, which enables easy floating without doing. When it is 1 mm or less, the bubbles tend to be attached to and retained in the biofilm carrier and change into large bubbles when they float, and the appropriate movement of water due to the bubbles becomes poor, so that the fibers forming the fiber are easily separated. The fibers are unlikely to fall apart, so that the aerobic bacteria and microorganisms tend to be unevenly adhered. Further, when the average diameter is 5 mm or more, the floating from water becomes excessively fast and the contact time with water becomes short, so that it tends to be difficult to maintain a high amount of residual oxygen in water. More preferably, the sewage in the water tank can be uniformly moved and the dissolved oxygen concentration in the water can be rapidly increased to be stably maintained, and even if the biofilm carrier of the carbon fiber to be used does not stop on the carrier, it is easy. It is a fine bubble having an average diameter of 2 to 3 mm that can be floated on the surface. Further, it is desirable that the bubbles have as small a variation as possible with respect to the average diameter.

The sparge tube used in diffusing tube present invention a synthetic resin, ones and particle type which solidified with an adhesive or the like to have an air passage to a very small diameter of the particles made of ceramics or the like between the particles, but the slit type It is preferable that the shape is a rectangular shape, a disk shape, or a pipe shape that is easy to dispose evenly on the entire bottom surface of the water tank. More preferably, it is a slit type air diffuser having a function of forming a large number of fine bubbles, a disk-shaped one having a large number of concentric slits arranged therein, a rectangular one having a large number of slits arranged in parallel to its sides, It is possible to use a pipe-shaped product having slits in the pipe. Which air diffuser is used can be selected depending on the shape of the water tank, the strands of the carbon fiber to be installed, the tissue body, and the installation state, but the slit type air diffuser using a membrane having slit-like micropores has a small variation. It is preferable because bubbles can be formed. In particular, a disc-shaped air diffusing tube using a membrane having a slit as shown in FIG. 1 is preferable because it can form fine bubbles with little variation. The membrane is a thin plate having a thickness of 1 to 10 mm made of polyvinyl chloride or the like in addition to silicone rubber, nitrile rubber, polyethylene propylene rubber, etc., and has a slit or penetrating through it with a cutter, a laser, etc., and usually has a slit. Although it is in a closed state, when air pressure is applied to the air diffusing tube, the slit is opened and air is ejected to form uniform fine bubbles. The slit length of the slit type air diffusing tube is selected depending on the size of the fine bubbles to be used, the floating speed and the water depth at which the air diffusing tube is installed, but is preferably 0.1 to 1.5 mm, and particularly 0.4
.About.0.7 mm is preferable because fine bubbles having an average diameter of 2 to 3 mm can be formed. The gap between the slits in the length direction and the width direction of the slit of the air diffuser is 1
-5 mm is preferable from the viewpoints of shape retention with respect to air pressure, increasing the number of bubbles while preventing coalescence of fine bubbles, and the like.

Fiber Mounting Unit The fiber mounting unit of the present invention is made of metal, plastics,
It is composed of a three-dimensional frame made of a material such as fiber reinforced plastics, strands of carbon fiber attached to it, and a structure. The three-dimensional frame needs to be large enough to be mounted in the water tank to which it is applied. The shape of the three-dimensional frame can be variously selected, such as a cubic type or a cylindrical type so as to form a hexahedron, but a cubic type that can be uniformly installed in a water tank as shown in FIG. 2 is preferable. It is preferable that the carbon fiber is attached to the three-dimensional frame by fixing the both ends to the three-dimensional frame with the slack so that the fiber is vertical or horizontal and can be swung. In particular, when the carbon fiber strands are attached to the three-dimensional frame, it is more preferable to attach the strands in the horizontal direction with respect to the water surface rather than in the vertical direction because the strands are less likely to be twisted and twisted. In a water tank in which the fiber mounting unit is arranged in a water tank, compared with a case where the carbon fibers are directly fixed to the water tank, a large amount of microbial sludge is fixed to the new carbon fibers by water treatment for a long period of time. It is preferable that the work of exchanging with is reduced and the exchanging work can be performed in a short time.

Water Treatment Method and Apparatus The water treatment method and apparatus according to the present invention is a single water tank in which the carbon fibers and fine bubbles, preferably fine bubbles having an average diameter of 1 to 5 mm, are diffused over the entire surface and the volume of the water tank is 10 m ³ or more. An industrial-scale water treatment method to be carried out, which is an apparatus for carrying out this method, that is, a diffusing tube having a plurality of holes, preferably a membrane having slit holes, particularly a slit length of 1 to 1.
A slit type air diffusing tube having a size of 5 mm was placed on the entire bottom surface of the water tank, and the strands of carbon fiber and the tissue were directly mounted in the water tank, or the carbon fiber was installed in a fiber mounting unit and placed in the water tank. The water treatment device comprises a water tank having a raw water inlet and a treated water outlet.

In the method of the present invention, when the carbon fiber is a strand, the fiber direction can be made horizontal or vertical with respect to the water surface so that the single fibers constituting the fiber can be evenly separated. It is preferable because it can be shaken well with water so that aerobic bacteria and microorganisms can be fixed well.
In particular, when the strand is used, it is more preferable to mount the fibers in the horizontal direction because it is easy to uniformly disperse the single fibers. In this case, the carbon fiber is preferably in a slack state where it can be swung by the movement of water, not in a tense state. When the carbon fiber is a tissue, it is possible to arrange a cord or rope part corresponding to the trunk in a water tank as a longitudinal direction with respect to the water surface. It is preferable because the water flow locally generated by the floating causes the water to rock relatively evenly and uniformly and aerobic bacteria and microorganisms can be fixed on average.

The amount of the carbon fibers used in the method and apparatus of the present invention varies depending on the state of the carbon fibers installed in the water tank, but usually the amount of the carbon fibers is about 10 to 500 grams per cubic meter of water volume of the water tank. Is preferred. 10
When it is less than gram, it becomes difficult to stably purify BOD and SS components in the wastewater over a long period of time, and when it is more than 500 grams, a large amount of aerobic bacteria and microbial sludge adheres and water permeability tends to deteriorate. It is not preferable because it appears.

In the method and apparatus of the present invention, the air diffusing tube is installed so that the minimum gap of the air diffusing tube is 30 cm or less, and at least directly under the carbon fiber strands and / or tissue bodies arranged in a water tank. It is preferable to disperse them so that they are located as evenly as possible. In the present invention, disposing the diffuser tubes in this manner on the bottom surface of the water tank in this manner is defined as an overall arrangement, and
Emitting air bubbles into water from the diffuser arranged on the entire surface is defined as total air diffusion. When fine air bubbles are entirely diffused in the sewage in the water tank in which the strands of carbon fibers and / or the body of tissue are immersed with the air diffuser arranged over the entire surface, it is difficult for the fibers to be twisted or twisted. It is preferable because a high fixation efficiency of aerobic bacteria and microorganisms can be obtained. When the installation distance of the air diffuser exceeds 30 cm, the movement of water in the portion where the strands of carbon fiber or / and the tissue body are installed due to fine bubbles becomes slow, so that the single fiber constituting the carbon fiber is shaken. If the amount becomes insufficient, the fixation of aerobic bacteria and microorganisms tends to decrease. Further, when the air diffuser is arranged so as to be unevenly distributed on the bottom surface of the water treatment tank on which the carbon fibers are installed, the water in the tank is not only unbalanced but also the fibers are oscillated undesirably. It is not preferable because aerobic bacteria and microbial sludge do not adhere to the fibers evenly, and sludge drop-off and SS removal effects decrease.

The number of fine air bubbles applied in the present invention varies depending on the number of holes or slits provided in the air diffuser, the water depth installed in the water tank, the amount of air supplied, the pressure, etc. The value estimated from the average volume of the above, that is, 1 to 20 million pieces of sewage are supplied per second.

The floating speed of the fine bubbles is preferably 1 to 50 cm / sec because it requires the action of evenly stirring water by the bubbles and the action of rapidly increasing the amount of dissolved oxygen in water. When it is 1 cm / sec or less, the action of moving water becomes poor, so that the carbon fiber cannot be swung sufficiently, and thus it becomes difficult to supply sufficient dissolved oxygen and nutrients to the aerobic bacteria and microorganisms to be fixed. Breeding / proliferation declines and BOD
It is not preferable because the effect of reducing SS is reduced. Further, when it is 50 cm / sec or more, the contact time between the bubbles and water becomes short, and it becomes difficult to maintain the dissolved oxygen concentration in water high, which is not preferable. More preferably, the floating speed of the bubbles is 20 to 40 cm / sec.

The air pressure of the air diffuser applied to create the fine air bubbles of the present invention depends on the type of air diffuser, the size of the air bubbles,
Adjustment is performed in consideration of the hole of the air diffuser, the size and number of slits, the depth of water in which the air diffuser is arranged, and the like. When an air diffuser having the membrane slit is used, the slit length is usually 2 mm and the length direction of the slit. Diameter 50c provided in a concentric circle shape with an interval of 1 mm and with an interval of the concentric circles of 2 mm
When the m-type disk diffuser is placed at a water depth of 5 m, the air pressure is 49000 Pa (Pascal), which is the slit opening resistance of the disc diffuser membrane, usually 4900 to 5
About 53900 to 5400 Pa, which is the sum of 400 Pa, is preferable. About 980 for every 1m deeper than 5m
It is preferable to apply the air pressure added with 0 Pa.

The amount of air applied to the air diffuser is the capacity of the water treatment tank, the dissolved oxygen and BO in the treated water flowing into the water treatment tank.
It can be selected in consideration of the amount of D, the size / floating speed of the bubbles, the stirring action of water, the amount of microorganisms, the growth / proliferation rate, etc. Normally, the dissolved oxygen concentration in the water treatment tank is per liter of water. In order to obtain 3 to 8 mg, about 1 cubic meter / hour or more is preferable per 1 cubic meter of waste water to be treated.

In the water treatment apparatus of the present invention, the carbon fiber is arranged in a water tank, and an air diffuser having a plurality of holes, preferably a membrane having slit holes, particularly a slit length of 1 to 1 is used.
A water treatment device comprising a water tank having at least a raw water inlet and a treated water outlet, in which a slit-type air diffusing pipe having a size of 5 mm is entirely arranged at the bottom of the water tank.

The water tank is a container made of concrete, metal, plastics, fiber reinforced plastics and a combination thereof having side walls having a rectangular or circular bottom surface. The raw water inlet is provided on one side of the upper part or the lower part of the water tank, and the treated water outlet is provided on the facing side or near the center of the bottom part of the water tank, and the inflowing raw water is the carbon provided in the water tank. It is preferable to provide an inflow port and an outflow port at a position where the flow passes through the entire strand of fiber. The size of the tank is BOD, SS in raw water
It is selected according to the amount of components, the amount of inflow, the amount and installation method of the carbon fibers, the contact time between water and the carbon fibers, etc.

In the water treatment apparatus of the present invention, the fibers are 20 to 30 cm above the air diffusing tube in the water tank and 20 to 5 below the water surface.
The fiber mounting unit, which is mounted between a vertical or horizontal pipe, rod, etc. provided between 0 cm, or has the carbon fiber mounted so as to be in the position when installed in a water tank It is a water treatment device installed inside. In this case, when the carbon fiber is a strand, it is preferable to mount the carbon fiber in a slack state because aerobic bacteria and microbial sludge are evenly attached to the strand and a high SS removal effect can be obtained.

When the above-mentioned water treatment method and water treatment apparatus of the present invention are used, BOD and S which are pollutants in wastewater such as rivers, ponds, lakes, seas, sewage, industrial wastewater, domestic wastewater, etc.
Since the S component can be removed economically and extremely efficiently, a clean water environment can be secured.

[0034]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Unless otherwise specified,%
Means% by weight.

In the present invention, the average diameter of the fine bubbles is taken by photographing the bubbles continuously generated by the diffusing tube placed in water when the bubbles rise 20 cm from the diffusing tube.
Zero calipers were measured and determined.

Example 1 A disk type air diffusing tube shown in FIG. 1 (diameter 50 cm, polyethylene propylene membrane, slit length 2 mm, slit spacing in the circumferential direction and spacing between the circumferences of 1)
mm, having a slit within a radius of 5 to 24 cm from the center of the circle), as shown in FIGS. 4 and 5, 144 bottoms of the air diffuser tubes 19 are arranged at the bottom of the water tank without any gap so as to be in contact with each other. Width (short side) having (width 3 m, length 12 m)
A water tank with a concrete wall 15 of 4.0 m, length (long side) 14.0 m, and height 6 m (water height 5.25 m, water amount about 29
0 m ³ ) and a water treatment tank provided with a raw water supply adjusting tank 25 and a treated water discharge tank 26 each having an overflow type raw water inlet 21 and a treated water outlet 22 on both outer sides, and a carbon content of 95%. Strand 14 of carbon fiber (constituent number 12000, specific gravity 1.76, single fiber diameter 7 μm, tensile strength 3750 MPa, tensile elastic modulus 23)
5 GPa) is installed in a water treatment device (FIGS. 4 and 5) in which about 48 kg, which corresponds to about 165 g per 1 m ³ of water in the aquarium, is installed in the longitudinal direction with respect to the water surface. ) Is used for the BOD and S shown in Table 1.
Factory effluent (raw water) containing S component is continuously flowed at 25 m ³ / hour, and the contact time of the strand with water is about 7 hours and the passing time of the water treatment device is about 12 hours. Processed. As shown in FIG. 3, the fiber mounting unit has a structure in which the carbon fiber strands are attached to a three-dimensional frame having a skeleton made of a stainless material. As shown in FIG. 2, the three-dimensional frame having a skeleton made of stainless steel has pillars 5
And the long sides 8 and 10 of the top surface, the long sides 11 and 13 of the bottom surface and the short sides 6 and 7, and the stainless steel materials 9 and 1 passed in parallel with the long sides.
It is composed of 2 and the upper and lower surfaces are 5.2 from the bottom of the water tank.
Fixed to a height of 5 m and 25 cm, the short sides 6 and 7 (width) of each surface have a length of 1.0 m and long sides 8, 10 and 1
The length of 1, 13 (vertical) is 3.5 m, long side 8, 10, 1
Pipes having a diameter of 5 cm are used for the stainless steel materials 1 and 13 and the central stainless steel materials 9 and 12, and the height of the support column 5 is 5.25 m. The carbon fiber strands are bundled between the long pipes at the same position above and below the three-dimensional frame, for example, as shown in FIG.
Was suspended in two rows so as to straddle, and the lower end of the strand was fixed to the lower pipe while being slackened to a length of 5.2 m in which 20 cm was added to the center distance between the upper and lower pipes. In this way, one of the fiber mounting units 20 has six bundles of four bundles of the strands arranged at 5 cm intervals with one row having a length of 3 m, and six rows, a total of 366 strands 14 of the carbon fiber. I put on. The eight bodies of the fiber mounting unit 20 are so arranged that each side of the three-dimensional frame and the side wall of the water tank are parallel to each other and that a stainless steel pipe having a diameter of 5 cm of the unit is located right above the air diffuser installed at the bottom of the water tank. It was placed (Fig. 5). Using the water treatment device (the water treatment device of the present invention), the air pressure in the air diffusion pipe is set to 5400.
A flow rate of 7 Nm ³ / min was fed under 0 Pa, and fine bubbles having an average diameter of 3 mm were diffused all over the dirty water at a speed of about 20 cm / second, and the strands of the carbon fiber were swayed for water treatment.
As shown in Table 1 which shows the results of analysis of raw inflow water and outflow treated water after continuous water treatment for one month, the water treated by the method of the present invention has a continuous treatment period for both BOD and SS components. It shows a moderately good low value, and it is visually confirmed that sludge consisting of aerobic bacteria and microorganisms is uniformly and evenly adhered to the strand of the carbon fiber in the length direction of the strand and also on each strand. Admitted.

Example 2 Instead of the carbon fiber strand used in Example 1, a strand made of polypropylene having a diameter of 2 mm was used for the trunk, and a carbon fiber strand having a carbon content of 85% was used for the branch (the number of constituents: 24,000). , Specific gravity 1.76, single fiber diameter 7.5 microns, tensile strength 1750 MPa, tensile modulus 1
35 GPa) with a 30 cm long central portion fixed to a trunk, and using a tissue body attached at intervals of 15 cm in the length direction of the trunk, except that it is attached to the position of the four-strand bundle of Example 1 In the same manner as in No. 1, water was continuously supplied for one month, and raw water and treated water after one month were analyzed. The amount of the carbon fibers in the tissue is about 16 per 1 m ³ of water.
It was 0 g, and the amount used in the water tank was about 50 kg.
As a result, the fixed state of the sludge during the treatment period was uniform, the BOD and SS components of the treated water showed good low values, and no sedimentation tank was required.

Comparative Example 1 and Comparative Example 2 Using the water treatment apparatus described in Example 1, the amount of air was changed and the average diameter of the fine bubbles was 0.5 mm (Comparative Example 1) and 7 mm.
Water treatment was carried out in the same manner as in Example 1 except that the two levels of (Comparative Example 2) were used. As shown in the results in Table 1, when the average diameter was 0.1 mm (Comparative Example 1), the effect of removing the BOD component in water was low. This is because the swaying of the strand due to the air bubbles was not sufficient, and because the air bubbles floated and remained in a part of the fibers to associate with each other to form a large air bubble, the water movement became uneven and It seems that twisted ones also appeared, and many of them had less aerobic bacteria and microorganisms fixed. Further, when the average diameter is 7 mm (Comparative Example 2), not only the dissolved oxygen concentration in water could not be maintained at 6 mg in 1 liter of water, but also the movement of the strand in water was locally accelerated and the fiber Part of which was twisted to make the sludge non-uniformly fixed, and the effect of removing BOD and SS components in water was low.

Comparative Example 3 and Comparative Example 4 Instead of the fiber mounting unit in the water treatment apparatus described in Example 1, a stainless pipe having a diameter of 5 cm was placed at the same position where the fiber mounting unit was installed in the water tank. The carbon fiber strands used in Example 1 which were attached using the side wall 15 of the water tank were installed at the same positions as in Example 1 with the same amount of fiber per amount of water, and a 1 mm thin plate made of silicon. The same type as that of Example 1 manufactured in 1. and the slit lengths of 0.5 mm (Comparative Example 3) and 8 mm (Comparative Example 4).
And the BO shown in Table 1 in the same manner as in Example 1
Factory wastewater of D and SS components was treated with water. As a result, in the case where the slit length was 0.5 mm (Comparative Example 3), the slit clogged with dust on the 15th day, fine bubbles were not evenly formed, and the water treatment was stopped. In the case of 8 mm (Comparative Example 4), the average diameter of the fine bubbles was as large as 10 mm, aerobic bacteria and microorganisms adhered to the strand were unevenly distributed, and some sludge fell off and the removal efficiency of the SS component was low. .

Example 3 Instead of the fiber mounting unit of the water treatment apparatus described in Example 1, a fiber mounting having a structure in which the carbon fiber strands 34 are mounted on a three-dimensional frame having a stainless material framework as shown in FIG. Water treatment was carried out for 1 month in the same manner as in Example 1 except that the unit was used. That is, a three-dimensional frame having a stainless steel skeleton has four columns 29 (height 5.25 m) and three short sides 3
0, 31 (horizontal) length is 1.4m, long sides 32, 33
A rectangular frame having a length of (vertical) of 3.5 m is attached in 10 steps from the uppermost part of the support pillar so as to be horizontal at intervals of 50 cm, and the left and right short sides (horizontal) of each rectangular frame. The four bundles 34 of carbon fiber strands used in Example 1 having a length of 3.6 m were parallel to each other at a distance of 2.5 cm between the stainless steel pipes having a diameter of 1 cm used for the above, and 54 pieces per one rectangular frame as a whole. 540 pieces were attached. Eight bodies of this fiber mounting unit were arranged on the air diffuser in the same orientation as the fiber mounting unit in Example 1.
The amount of the carbon fiber is 170 g per 1 m ³ of sewage in the water tank,
The total weight of carbon fibers was about 50 kg. As a result, the strands during the treatment period hardly twist, the twisting and twisting of the strands are smaller than in Example 1 in which the strands are arranged vertically, and the sludge is fixed in a uniform state. The BOD and SS components of No. 2 showed good low values and did not require a settling tank.

Example 4 In Example 1, 64 diffusing tubes were rearranged so that the minimum gaps in columns and rows were each 25 cm, and an air pressure in the diffusing tubes was set to 54000 Pa and a flow rate of 7 Nm ³ / min was fed. The velocity of about 25 cm /
Water treatment was performed in the same manner as in Example 1 except that the entire surface was diffused into the dirty water in seconds. As shown in Table 1, the results of analysis of the raw inflow water and the outflow treated water in the water tank after continuous water treatment for one month show that the water treated by the method of the present invention is BOD, SS.
Both components show good low values during the continuous treatment period, and
Sludge consisting of aerobic bacteria and microorganisms was uniformly and evenly adhered to the strands of the carbon fibers in the length direction of the strands and also in each strand, showing a water treatment effect almost the same as that of the example.

Example 5 The total amount of sludge such as aerobic bacteria and microorganisms fixed to the fiber after 1 month of the water treatment described in Example 1 was about 5 tons in the water-containing state when taken out into the air. . In order to take out the fibers to which the sludge has adhered from the water treatment device, the entire fiber loading unit is lifted by a small crane and taken out from the water treatment device, and then a new fiber loading unit loaded with the fibers in advance is placed at a predetermined position. The water treatment was restarted. The total amount of work required for the replacement was 2 hours by one person, and the water treatment could be restarted extremely efficiently, and the water treatment device having the fiber mounting unit of the present invention was effective.

Comparative Example 5 Instead of the fiber mounting unit of the water treatment apparatus described in Example 1, a stainless steel pipe having a diameter of 5 cm was installed in the water tank at the same position where the fiber mounting unit was installed. Was continuously attached for 1 month in the same manner as in Example 1 except that the carbon fiber strands used in Example 1 were attached at the same position as in Example 1 and the same amount of the fiber per water amount was installed. Water treatment. As a result, the total amount of sludge such as aerobic bacteria and microorganisms fixed to the fiber after one month reached about 5 tons in the water-containing state when taken out into the air. In order to take out the fibers to which the sludge has adhered from the water treatment device, the operation of draining the dirty water from the water tank, the operation of removing the fibers from which the sludge has adhered to the stainless pipe and taking them out from the water tank, and restarting the water treatment Therefore, it is difficult to use a machine to attach the new fiber, and the total amount of work is 16
It took time and was extremely inefficient.

Table 1

[0045]

INDUSTRIAL APPLICABILITY The water treatment method and the water treatment apparatus of the present invention are for industrial scale using a single tank having a tank volume of 10 m ³ or more for wastewater such as rivers, ponds, dams, lakes, sewage, factory wastewater, domestic wastewater. For purification, BOD, which is a pollutant in water,
Since the SS component can be removed extremely effectively, the settling tank, which has been indispensable in the past, is hardly required, and it is extremely economical. Further, since the present invention is a method and apparatus for aerating the entire surface of the carbon fiber from below using fine bubbles, the dissolved oxygen concentration in water can be uniformly and rapidly increased with a small amount of air, and the aerobic property can be improved. Bacteria and microorganisms can be fixed uniformly and evenly on the monofilaments that make up the carbon fiber, so less air-supplied electric energy is required compared to conventional water treatment, and the equipment is relatively compact, making it an industrial scale. The water environment can be improved by water treatment.

[Brief description of drawings]

FIG. 1 Schematic diagram of slit type disc type air diffuser

FIG. 2 is a schematic view of a three-dimensional frame used for the fiber mounting unit.

FIG. 3 is a schematic view of a fiber mounting unit in which carbon fiber strands are vertically mounted.

FIG. 4 is a schematic side sectional view of a water treatment device of the present invention.

5 is a top view of FIG.

FIG. 6 is a schematic view of a carbon fiber strand mounted so as to straddle a stainless pipe.

FIG. 7 is a schematic view of a fiber mounting unit in which carbon fiber strands are horizontally (horizontally) mounted.

[Explanation of symbols]

1 Silicon Rubber Membrane 2 Slit 3 Air Chamber 4 Air Supply Ports 5, 29 Fiber Mounting Unit Solid Frame Support 6 Fiber Mounting Unit Upper Frame (Short Side) Frame Material 7 Fiber Mounting Unit Lower Frame (Short Side) Frame Material 8, 9, 10 Upper part (long side) of the fiber mounting unit solid frame, fiber fixing frame material 11, 12, 13 Lower part (long side) of the fiber mounting unit solid frame, fiber fixing frame material 14, 34 Carbon fiber 15 Water treatment device Water tank walls 16 and 17 Overflow dam plate 18 Water in water tank 19 Diffuser pipe 20 Fiber mounting unit 21 Raw water inlet 22 Treated water outlet 23 Air supply pipe 24 Air supply pipe 25 Raw water supply adjusting tank 26 Treated water discharge tank 27 Raw water supply port 28 Treated water discharge port 30, 31 Fiber mounting unit solid frame short side fiber fixing material 32, 33 Fiber mounting unit solid frame long side frame material

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[Procedure amendment]

[Submission date] February 27, 2002 (2002.2.2)
7)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Carbonaceous Fiber and Carbon Fiber The carbonaceous fiber and carbon fiber used in the present invention include acrylic fiber, pitch, and mesoface pitch in an oxidizing gas atmosphere such as oxygen in a known furnace such as a heating furnace. Known oxides of polyacrylonitrile type (PAN type), pitch type, mesophase type, and phenol type, which are obtained by firing oxidized fiber obtained by oxidation using and a fiber using phenol resin in an inert gas at 600 ° C. or higher, A fiber having a specific gravity of 1.5 to 1.8, a diameter of 5 to 10 micrometers, a tensile strength of 500 MPa or more, and a tensile elastic modulus of 50 GPa or more. The carbonaceous fiber in the present invention has a carbon content of 75 to less than 90% by weight, and
The carbon fiber has a carbon content of 90% by weight or more.
In the following description, the carbonaceous fiber and the carbon fiber are collectively referred to as carbon fiber.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Fine Bubbles The fine bubbles of the present invention are formed by sending air into an air diffuser arranged in a water tank and blowing the air into the water through fine holes on the surface of the air diffuser. The shape of the fine bubbles differs depending on the shape of the hole of the diffuser tube, the shape of the slit, the movement of water, etc., but it does not necessarily have to be a true sphere.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

Air diffuser The air diffuser used in the present invention is of a particle type in which fine particles of synthetic resin, ceramics or the like having a small diameter are fixed with an adhesive or the like so as to have an air passage between the particles, or a slit type. It is preferable that the shape is a rectangular shape, a disk shape, or a pipe shape that is easy to dispose evenly on the entire bottom surface of the water tank. More preferably, it is a slit type air diffuser having a function of forming a large number of fine bubbles, a disk-shaped one having a large number of concentric slits arranged therein, a rectangular one having a large number of slits arranged in parallel to its sides, It is possible to use a pipe-shaped product having slits in the pipe. Which air diffuser is used can be selected depending on the shape of the water tank, the strands of the carbon fiber to be installed, the tissue body, and the installation state, but the slit type air diffuser using a membrane having slit-like micropores has a small variation. It is preferable because bubbles can be formed. In particular, as shown in Figure 1.
A disk-shaped air diffusing tube using a membrane having slits is preferable because it can form fine bubbles with little variation. The membrane is a thin plate having a thickness of 1 to 10 mm made of polyvinyl chloride or the like in addition to silicone rubber, nitrile rubber, polyethylene propylene rubber, etc., and has a slit or penetrating through it with a cutter, a laser, etc., and usually has a slit. Although it is in a closed state, when air pressure is applied to the air diffusing tube, the slit is opened and air is ejected to form uniform fine bubbles. The slit length of the slit type air diffusing tube is selected depending on the size of the fine bubbles to be used, the floating speed and the water depth at which the air diffusing tube is installed, but is preferably 0.1 to 1.5 mm, and particularly 0.4
.About.0.7 mm is preferable because fine bubbles having an average diameter of 2 to 3 mm can be formed. The gap between the slits in the length direction and the width direction of the slit of the air diffuser is 1
-5 mm is preferable from the viewpoints of shape retention with respect to air pressure, increasing the number of bubbles while preventing coalescence of fine bubbles, and the like.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Fiber Mounting Unit The fiber mounting unit of the present invention is made of metal, plastics,
It is composed of a three-dimensional frame made of a material such as fiber reinforced plastics, strands of carbon fiber attached to it, and a structure. The three-dimensional frame needs to be large enough to be mounted in the water tank to which it is applied. The shape of the three-dimensional frame can be variously selected, such as a cubic type or a cylindrical type so as to form a hexahedron, but a cubic type that can be uniformly installed in a water tank as shown in FIG. 2 is preferable. It is preferable that the carbon fiber is attached to the three-dimensional frame by fixing the both ends to the three-dimensional frame with the slack so that the fiber is vertical or horizontal and can be swung. In particular, when the carbon fiber strands are attached to the three-dimensional frame, it is more preferable to attach the strands in the horizontal direction with respect to the water surface rather than in the vertical direction because the strands are less likely to be twisted and twisted. In a water tank in which the fiber mounting unit is arranged in a water tank, compared with a case where the carbon fibers are directly fixed to the water tank, a large amount of microbial sludge is fixed to the new carbon fibers by water treatment for a long period of time. It is preferable that the work of exchanging with is reduced and the exchanging work can be performed in a short time.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Water Treatment Method and Apparatus The water treatment method and apparatus according to the present invention is a single water tank in which the carbon fibers and fine bubbles, preferably fine bubbles having an average diameter of 1 to 5 mm, are diffused over the entire surface and the volume of the water tank is 10 m ³ or more. An industrial-scale water treatment method to be carried out, which is an apparatus for carrying out the method, that is, a diffuser tube having a plurality of holes, preferably a membrane having slit holes, in particular, a slit length of 0.
A slit type air diffusing tube having a size of 1 to 1.5 mm is arranged on the entire bottom surface of the water tank, and the strands of carbon fiber and the tissue are directly mounted in the water tank, or the carbon fiber is installed in a fiber mounting unit. Is a water treatment device having a raw water inlet and a treated water outlet arranged in a water tank.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

The air pressure of the air diffuser applied to create the fine air bubbles of the present invention depends on the type of air diffuser, the size of the air bubbles,
Adjustment is performed considering the hole of the air diffuser, the size and number of slits, the depth of water in which the air diffuser is placed, etc., but when using the slit type air diffuser of the membrane, the slit length is usually adjusted.
Diameter 5 with a diameter of 0.5 mm and a concentric circle interval of 2 mm.
The air pressure when a 0 cm disk type air diffusing tube was placed at a water depth of 5 m was about 53,000 which was 49000 Pa (pascal) plus the pressure loss of the disk type air diffusing tube of about 4900 to 5400 Pa.
900~ 54400 Pa is preferable. It is preferable to apply the air pressure added with 9800 Pa each time the water depth exceeds 5 m and becomes 1 m deeper.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

In the water treatment apparatus of the present invention, the carbon fibers are arranged in a water tank and an air diffuser having a plurality of holes, preferably a membrane having slit holes, particularly a slit length of 0.
A water treatment device comprising a water tank having at least a raw water inlet and a treated water outlet, in which a slit type air diffusing pipe having a diameter of 1 to 1.5 mm is entirely arranged at the bottom of the water tank.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

Example 1 A disk type air diffusing tube shown in FIG. 1 (diameter 50 cm, polyethylene propylene membrane, slit length 0.5 m)
m, the slit spacing in the circumferential direction and the spacing between the circumferences are 1 mm, respectively, and a slit is provided within a radius of 5 to 24 cm from the center of the circle), as shown in FIG. 4 and FIG. Width (short side) 4.0 m, length (long side) 14.0 m, height 6 m having a bottom surface (width 3 m, length 12 m) in which 144 pieces of trachea 19 are arranged without a gap so as to be in contact with each other
And a water tank partitioned by an overflow sheathing board 16 and 17 (water height 5.25M, water about 290 m ^3), the two outer
In a water treatment tank having a raw water supply adjusting tank 25 and a treated water discharge tank 26 each having a raw water inlet 21 and a treated water outlet 22, a strand 14 of carbon fiber having a carbon content of 95% (the number of constituents is 12000). Book, specific gravity 1.76, single fiber diameter 7 μm, tensile strength 3750 MPa, tensile elastic modulus 235 GPa) about 16 per 1 m ³ of water in the water tank.
Using the water treatment device (FIGS. 4 and 5) in which the fiber mounting unit 20 shown in FIG. 3 in which about 48 kg corresponding to 5 g is attached in the longitudinal direction with respect to the water surface, the BOD shown in Table 1 Factory wastewater (raw water) containing SS components is 25m ³ /
Water was continuously treated for a period of time to perform water treatment so that the contact time of the strands with water was about 7 hours and the passage time of the water treatment device was about 12 hours. As shown in FIG. 3, the fiber mounting unit has a structure in which the carbon fiber strands are attached to a three-dimensional frame having a skeleton made of a stainless material. As shown in FIG. 2, the three-dimensional frame having a skeleton made of stainless steel has pillars 5, upper long sides 8 and 10 and bottom long sides 11 and 1.
3 and stainless steel materials 9 and 12 which are provided in parallel with the long side in the center of the short side 6 and 7, and the upper and lower surfaces are fixed at a height of 5.25 m and 25 cm from the bottom of the water tank. The length of the short side 6, 7 (horizontal) of each surface is 1.0 m, the length of the long side 8, 10, 11, 13 (vertical) is 3.5 m, and the long side 8, 10, 11, 13 and the center 5 cm diameter pipes are used for the stainless steel materials 9 and 12, and the height of the support column 5 is 5.25.
m. The carbon fiber strands are provided between the long pipes at the same position above and below the three-dimensional frame, for example, as shown in FIG.
As shown in FIG. 5, the upper pipe 8 is hung in two rows so as to straddle the four bundles 14 of carbon fiber, and is slackened to have a length of 5.2 m by adding 20 cm to the center distance between the upper and lower pipes. In this state, the lower end of the strand was fixed to the lower pipe. In this manner, one fiber mounting unit 20 has six rows of four bundles of the strands each having a length of 5 m and a length of one row of 3 m, and a total of 36 rows.
Six strands 14 of the carbon fiber were attached. The eight bodies of the fiber mounting unit 20 are so arranged that each side of the three-dimensional frame and the side wall of the water tank are parallel to each other and that a stainless steel pipe having a diameter of 5 cm of the unit is located right above the air diffuser installed at the bottom of the water tank. It was placed (Fig. 5). Using the water treatment device (the water treatment device of the present invention), an air pressure of 54000P is applied to the air diffuser.
Under a, a flow rate of 7 Nm ³ / min was fed and fine bubbles having an average diameter of 3 mm were diffused all over the dirty water at a speed of about 20 cm / sec, and the strands of the carbon fiber were rocked for water treatment. As shown in Table 1 which shows the results of analysis of raw inflow water and outflow treated water after continuous water treatment for one month, the water treated by the method of the present invention has a continuous treatment period for both BOD and SS components. It shows a moderately good low value, and it is visually confirmed that sludge consisting of aerobic bacteria and microorganisms is uniformly and evenly adhered to the strand of the carbon fiber in the length direction of the strand and also on each strand. Admitted.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

Comparative Example 1 and Comparative Example 2 In the water treatment device described in Example 1 , the slit length
Air diffuser with 0.1mm and 1.7mm length ,
The average diameter of fine bubbles is adjusted to 0.5 mm (Comparative Example 1) and 7
Water treatment was carried out in the same manner as in Example 1 except that the treatment was performed at 2 levels of mm (Comparative Example 2). As shown in Table 1, when the average diameter was 0.5 mm (Comparative Example 1), the effect of removing the BOD component in water was low. This is because the swaying of the strand due to the air bubbles was not sufficient, and because the air bubbles floated and remained in a part of the fibers to associate with each other to form a large air bubble, the water movement became uneven and It seems that twisted ones also appeared, and many of them had less aerobic bacteria and microorganisms fixed. Further, when the average diameter is 7 mm (Comparative Example 2), not only the dissolved oxygen concentration in water could not be maintained at 6 mg in 1 liter of water, but also the movement of the strand in water was locally accelerated and the fiber Part of which was twisted to make the sludge non-uniformly fixed, and the effect of removing BOD and SS components in water was low.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

Comparative Example 3 and Comparative Example 4 Instead of the fiber mounting unit in the water treatment apparatus described in Example 1, a stainless pipe having a diameter of 5 cm was placed at the same position where the fiber mounting unit was installed in the water tank. the strands of carbon fibers used attached by utilizing the side wall 15 of the water tank in example 1 at the same position as in example 1, the amount of fibers per volume of water was placed as the same amount, further a silicon 3 mm Using the same type of thin plate as in Example 1 and having slit lengths of 0.08 mm and 1.8 mm, the factory effluent of BOD and SS components shown in Table 1 was treated with water in the same manner as in Example 1. . As a result, the slit length is 0.08 mm
In the case of, the average diameter of the fine bubbles is 0.3 mm (Comparative Example 3) .
On the 15th day, the slits clogged with dust and fine bubbles were not uniformly formed, and the water treatment was stopped. 1.8
In case of mm, the average diameter of fine bubbles is 10 mm (Comparative Example 4).
In addition, aerobic bacteria and microorganisms adhered to the strands were unevenly distributed, and some sludge fell off, resulting in low efficiency of removing SS components.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction content]

[0044]

[Table 1]

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4D003 AA08 AB02 EA17 EA18 EA25                       EA35 FA02                 4D029 AA01 AB07                 4G035 AB07 AE13

Claims (5)

[Claims] 1. When water treatment is carried out in a water tank, carbonaceous fibers and carbon fiber strands and / or tissue bodies are soaked, and fine air bubbles are diffused over the entire surface using an air diffuser arranged entirely on the bottom of the water tank. An industrial-scale water treatment method characterized by: 2. The industrial-scale water treatment method according to claim 1, wherein the fine bubbles have an average diameter of 1 to 5 mm. 3. An at least raw water inlet and a treated water outlet in which an air diffuser having a plurality of holes is entirely arranged at the bottom of a water tank, and carbonaceous fibers and strands of carbon fibers and / or tissue bodies are arranged in the water tank. Industrial scale water treatment equipment having. 4. The industrial scale according to claim 3, wherein the air diffuser is a membrane having a plurality of slit holes, and the carbonaceous fibers and carbon fiber strands and / or tissue bodies are attached to the fiber mounting unit. Water treatment equipment. 5. The industrial-scale water treatment device according to claim 4, wherein the fiber mounting unit mounts carbonaceous fibers and carbon fiber strands in a horizontal direction with respect to the water surface.