KR101691641B1

KR101691641B1 - Dissolved air flotation device for removing algae and taste and odor compounds at tne same time, and water-purification method using the same

Info

Publication number: KR101691641B1
Application number: KR1020140152743A
Authority: KR
Inventors: 이철우
Original assignee: 두산중공업 주식회사
Priority date: 2014-11-05
Filing date: 2014-11-05
Publication date: 2017-01-09
Also published as: KR20160053542A

Abstract

The present invention relates to a dissolved air floating apparatus for simultaneously removing algae and a hobby material, and more particularly, to a floating method and apparatus for floating algae and a foreign substance such as algae contained in raw water by using fine bubbles The present invention relates to a dissolved air floating apparatus for removing carbon nanotubes using carbon nanotubes, and a purification method using the same. The present invention relates to a dissolved air floating apparatus for removing dissolved carbon nanotubes By presenting the device, it is possible to reduce the size of the entire facility and to reduce the CAPEX to a maximum of 1/5 level. By using the micro-bubbles on the upstream side of the flotation tank, the flotation is removed by flotation. On the flotation downstream side, (i) It is possible to construct a top-down type adsorption filtration tank in which a plurality of plate-type CNT panels in which a plurality of holes are formed asymmetrically in the lower part are stacked in layers (Ii) A bottom-up adsorption filtration tank in which a plurality of CNT blocks of a filter material type are filled in a lateral upward flow region through which the treated water of the flotation tank is passed to remove this hobby material of raw water.
Thus, it is possible to effectively remove algae, particulate matter, hobby substances, pesticides, herbicides and trace organic substances simultaneously, and thus the water treatment apparatus can be compactly installed, which is economically advantageous.

Description

TECHNICAL FIELD [0001] The present invention relates to a dissolved air flotation apparatus for simultaneously removing algae and a hobby material, and a water purification method using the same. [0002]

The present invention relates to a dissolved air floating apparatus for simultaneously removing algae and a hobby material, and more particularly, to a floating air flotation apparatus for floating algae and foreign substances such as algae contained in raw water by using microbubbles The present invention relates to a dissolved air flotation apparatus for removing foreign substances from a raw water using carbon nanotubes and a purification method using the same.

Generally, a Dissolved air flotation (DAF) device is a device that performs a flocculation-sedimentation-filtration process to remove foreign substances such as suspended solids, sediment and algae contained in raw water such as seawater, sewage or wastewater, And has been used in water treatment methods such as coagulation, floatation and filtration.

1 is a conventional dissolved air floating apparatus including a mixing tank 1, a flocculation tank 2, a float tank 3, a water tank 4, a saturator tank, and an air compressor. Here, in the mixing tank (1) and the flocculation tank (2), a stirrer is provided to mix the foreign substances contained in the raw water and the flocculant introduced into the raw water to form a flock.

1, the raw water having passed through the mixing tank 1 and the flocculation tank 2 flows into the lower portion of the flotation tank 3 and is normally dissolved in the saturated tank. As the water saturated with air is released, the pressure is reduced to form micro-bubbles, and the micro-bubbles and the raw water introduced are mixed to flocculate the foreign matter in the raw water. The floating aggregated foreign matter is removed through the skimmer.

Most of the water sources in Korea are dependent on surface water exposed to pollutants and are sensitive to the increase of pollution sources. In general, natural water contains a wide variety of organic materials (NOM: Natural Organic Matter) and minerals, which are present in the form of dissolved and suspended solids. Water has a circulation system and it is difficult to expect a clean enemy because of blocking upstream pollutants only. The supply of tap water in Korea did not change significantly in terms of quality compared to quantitative growth. As the population has increased and the industry has developed, the water quality of the raw water has deteriorated and the pollutants have also diversified. In addition, the problem of deterioration of water quality due to the occurrence of algae in the vicinity of the lake and the upstream area is seriously arising after the 4 major river maintenance project.

In general, the prosperity of algae due to the influx of nutrients from rivers is not a big problem directly but the deficiency of dissolved oxygen is a problem. However, after the 4 major river maintenance project, And the problem of deteriorating water quality due to eutrophication is becoming serious. Eutrophication is a phenomenon that occurs when substances such as carbon, nitrogen, and phosphorus accumulate in a water body that will become nutrients for the breeding of birds. These nutrients are included in domestic forests and factory wastewater as well as in the forests of forests, fertilizers used in agricultural lands, fodder for animal products, synthetic detergents. In this way, rivers with active human activity in the watershed are eutrophied at a faster rate than the natural state due to the continuous inflow of nonpoint sources. If nutrients continue to flow into the rivers in various forms and the rivers exceed the self-sufficiency capacity of the rivers, water pollution occurs. This process is further promoted by the congestion of river water bodies in the vicinity and upstream. Even if organic pollutants are decomposed and removed, minerals that will become nutrients can accumulate in the propagation of aquatic microorganisms.

In this way, the occurrence of algae is negatively influenced by the abundance of the dissolved oxygen in the water due to the breeding of the algae at a time when the algae are generated, that is, the proper nutrients such as nitrogen, phosphorus and temperature condition, Lt; / RTI >

In addition, as the eutrophication phenomenon becomes more severe in rivers and lakes, there is a problem that algae and actinomycetes are rapidly increased, resulting in taste and odor due to secretion of extracellular enzymes. Most of the taste and odor problems are mold odor, and at present, two substances, cyanobacteria, actinomycetes geosmin, and 2-MIB (2-methylisoborneol), have been identified. Other odors caused by phenol, diclohexanamine and oil are caused by accidents caused by factory drainage.

In general, this hobby material is removed by aeration, oxidation, or adsorption. The aeration method is easy to remove this hobby material generated by volatile compounds such as hydrogen sulfide (H ₂ S) The removal efficiency of 2-Methylisoborneol (Geosmin) and 2-MIB (2-MIB) is inferior. Oxidation method is an effective method of controlling this hobby material by using potassium permanganate, chlorine dioxide, However, these materials react with organics in the water to generate disinfection by-products (DBPs), which is dangerous.

On the other hand, the adsorption method is a universal and effective method for removing the hobby materials. Powder activated carbon (PAC) and granular activated carbon (GAC) are used as materials to be used. Powder activated carbon is intermittently And the granular activated carbon is effective for removing the chronic hobby material. However, powdered activated carbon requires a precipitation process to remove powdered activated carbon particles after adsorption, which is relatively difficult to apply to the floatation process, and granular activated carbon requires a separate filtration tank, which reduces economic efficiency.

Patent Document No. 0307253 discloses a method for removing algae from a water purification plant using a dissolved air flotation method. The flotation tank is provided with a dissolved air flotation method at the downstream end of the settling basin, and selectively applied when sedimentation efficiency drops. Water treatment equipment that can be used for water treatment.

In Patent Publication No. 0606555 (published on Aug. 1, 2006), ozone is substituted for the air used in the dissolved air flotation method, and activated carbon filter paper is applied to the bottom of the flotation tank to perform oxidation and disinfection by ozone and filtration and adsorption using activated carbon filter paper And a water treatment device that simultaneously forms the water.

Korean Patent Registration No. 1426704 (published on Aug. 14, 2014) discloses an activated carbon water treatment apparatus used in a water treatment process, a water treatment system using the same, and a water treatment method.

The above-mentioned prior art has a problem that the removal of the algae and the removal of the hobby materials by using different separate water treatment devices leads to overcapacity and an increase in CAPEX and OPEX due to the enlargement of the whole facilities.

Patent Registration No. 0307253 (issued September 24, 2001) Patent Registration No. 0606555 (published on August 1, 2006) Registered Patent Publication No. 1426704 (Announced on August 31, 2014)

The present invention is characterized in that the absorption filtration tank equipped with the carbon nanotubes is installed on the flotation downstream side of the dissolved air flotation device and the entire facility is installed in a compact manner to reduce the cappage and the installation and maintenance are relatively simple and easy, And a dissolved air floating device for simultaneously removing the hobby material and a water purification method using the same.

In order to achieve the above object, an embodiment of the present invention is a floating tank (3) in which foreign matter of a floating material, a clean substance or an alga contained in raw water is floated by minute bubbles, An adsorption filtration tank 10 equipped with a carbon nanotube (CNT) is integrally provided in a region downstream of the treated water passing through the float tank 3, and a flotation tank for simultaneously removing the tidal material.

The adsorption filtration tank 10 is a top down type adsorption filtration tank 11 integrally provided in the floating tank lower region 3a so that the process water passes through the carbon nanotubes by gravity and removes the hobby material, The adsorption filtration tank 11 is formed by stacking a plurality of plate-type CNT panels 11a. The CNT panel 11a is a porous CNT panel in which a plurality of holes 11b are formed and the holes 11b are formed such that the holes 11b do not coincide vertically between adjacent porous CNT panels 11a Asymmetrically. The top-down type adsorption filtration tank 11 is filled with a plurality of media type CNT blocks.

The adsorption filtration tank 10 is connected to the upflow region 3b at the rear end of the float tank 3 so that the treated water is removed while passing through the carbon nanotubes in the process of being transferred to the floatation tank 3, The bottom up type adsorption filtration tank 12 is filled with a plurality of media type CNT blocks 12a. A backwash nozzle 12c is provided below the bottom up adsorption filtration tank 12 to perform forward washing by spraying air or water.

According to another embodiment of the present invention, there is provided a mixing tank (1) for mixing raw water and a flocculant, a flocculating tank (2) for flocculating the raw water passed through the mixing tank (1) A floating tank 3 in which foreign substances are floated by fine bubbles generated by injecting pressurized water containing supersaturated dissolved air into raw water having passed through the flocculation tank 2, (DF) apparatus comprising a water tank (4) that stays before being transferred to a downstream process, the adsorption filtration tank (10) having a carbon nanotube (CNT) An algae integrally provided in a region on the downstream side via the treated water passing through the floating tank 3, and a dissolved air floating device for simultaneously removing the tidal material.

The adsorption filtration tank 10 is connected to the upflow region 3b at the rear end of the float tank 3 so that the treated water is removed while passing through the carbon nanotubes in the process of being transferred to the floatation tank 3, The bottom up type adsorption filtration tank 12 is filled with a plurality of media type CNT blocks 12a and injects air or water to perform a forward washing A backwashing nozzle 12c is provided under the up-down type adsorption filtration tank 12. The back-

The adsorption filtration tank 10 is provided with a top-down type adsorption filtration tank 11 integrally provided in the flotation tank lower region 3a so that the treated water passes through the carbon nanotubes by gravity and removes the hobby material, The upflow type adsorption filtration tank 12 provided in the upflow region 3b at the rear end of the flotation tank 3 to remove the hobby material while passing through the carbon nanotube in the process of being transferred to the flotation tank 3, to be.

A first transfer pipe 22 provided at the downstream side of the top-down type adsorption filtration tank 11 for transferring the treated water having passed through the top-down type adsorption filtration tank 11 to the water purification tank 4, A first valve 22a for interrupting the flow of the treated water in the flotation tank 22 and a second valve 22b provided on the bottom surface of the flotation tank 3 above the top of the top of the adsorption filtration tank 11 to collect the treated water that has passed through the flotation tank 3 The treatment water communicated with the collecting pipe 21 and the collecting pipe 21 and having passed through the floating tank 3 is introduced into the upward flow region 3b or the water purification tank 4 provided with the upflow type adsorption filtration tank 12, And a second valve 23a for interrupting the flow of the treated water in the second transfer pipe 23. The second transfer pipe 23 is connected to the second transfer pipe 23,

In another embodiment of the present invention, there is provided a flotation apparatus comprising: a pretreatment step (S10) of mixing raw water containing a contaminant and a flocculant to form a flock in which the contaminant and a flocculant are combined; (S20) for injecting pressurized water containing supersaturated dissolved air into the formed raw water to float the flocculant, and a treatment step (S20) for passing the treated water through the floatation area (3) And an adsorption filtration step (S30) for removing the hobby substance through an adsorption filtration tank (10) having carbon nanotubes (Carbon Nano Tube (CNT)), and a water purification method for simultaneously removing the hobby matter to be.

The downward adsorption filtration step (S31) in which the treated water is removed by gravity while passing through a top-down adsorption filtration tank (11) provided integrally with the flotation tank (3) (11a) is formed by laminating a plurality of plate-type porous CNT panels (11a) having a plurality of holes (11b) formed thereon, so that the holes (11b) are not vertically aligned between adjacent porous CNT panels (11a) Or the top down type adsorption filtration tank 11 is filled with a plurality of media type CNT blocks.

The adsorption filtering step S30 is integrally provided in the upflow region 3b at the rear end of the float tank 3 in the process of transporting the treated water to the downstream end and a media type CNT block 12a And the upward adsorption filtration step (S32) in which the tribo material is removed while passing through the bottom up-type adsorption filtration tank (12).

The adsorbing and filtering step S30 is performed such that the treated water passes through the downward adsorption filtering step S31 at the end of the lifting step S30 and then is changed upward to pass through the upward adsorption filtering step S32, Removed.

Provided is a dissolved air floating apparatus in which an adsorption filtration tank equipped with carbon nanotubes is provided on the flotation downstream side of the present invention, thereby reducing the total facility to a CAPEX of up to 1/5 level.

Specifically, in the upstream side of the flotation tank, algae are lifted by using micro-bubbles. On the flotation side, (i) a top-down adsorption process in which a plurality of plate-type CNT panels asymmetrically formed on the bottom of the flotation tank are laminated (Ii) a bottom-up adsorption filtration tank in which a plurality of CNT blocks of a filter material type are filled in a lateral upward flow region through which the treated water in the flotation tank passes, thereby removing the hobby material of the raw water. Therefore, it is possible to effectively remove algae, particulate matter, hobby substances, pesticides, herbicides and trace organic substances simultaneously, and only when a temporary problem occurs due to a collecting pipe at the bottom of the floating tank, It is possible to reduce the operation cost by constructing the adsorption filtration tank in the floatation tank, and thus the water treatment apparatus can be compactly installed, which is economically advantageous.

1 is a schematic view schematically showing a conventional dissolved air floating apparatus.
2 is a schematic diagram schematically illustrating a mixing tank provided with a top-down type adsorption filtration tank according to an embodiment of the present invention.
3 is a schematic diagram schematically illustrating a mixing tank provided with a bottom-up adsorption filtration tank according to an embodiment of the present invention.
4 is a schematic diagram schematically illustrating a dissolved air floating apparatus according to an embodiment of the present invention.
Figure 5 is a flow diagram of a purification method in accordance with an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

FIG. 1 is a schematic view schematically showing a conventional dissolved air floating apparatus. The mixing tank 1 and the flocculation tank 2 are provided on the upstream side of the floating tank 3, And a tank (4). The mixing tank (1) and the flocculation tank (2) are partitioned from each other by a partition wall, and communicate with each other through an upper portion and a lower portion of the partition wall, respectively. The upstream bulkhead of the mixing tank 1 is provided with a water gate so as to receive raw water from the outside. Each stirrer of the mixing tank (1) and the flocculation tank (2) allows mixing of the foreign matter contained in the raw water and the flocculant introduced into the raw water to form a flock.

(Bottom) is flooded in the compartment of the front end of the floating tank 3 so as to generate fine bubbles in the raw water in a region corresponding to the compartment in front of the floating tank 3 (referred to as a contact tank) Tank is installed. In this case, a nozzle is installed under the contact tank without a saturator tank, and micro bubbles are injected through the nozzle. One side of the saturator tank is connected to the air compressor so that compressed air can be supplied.

The micro bubbles provided from the nozzles of the saturator tank adhere to the flocks in the raw water flowing from the flocculation tank 2 so as to discharge the flocculant floated to the upper portion of the float tank 3 to the outside, A skimmer is installed on top to remove the flock. The treated water is called a treated water, and the treated water is discharged to the outside through the water tub 4 after passing through the strainer portion under the floating tank 3. [

FIGS. 2 and 3 illustrate an embodiment of the present invention. FIG. 2 is a cross-sectional view of a carbon nanotube (hereinafter, referred to as " carbon nanotube ") attached to a floating tank 3 floating by floating on a floating material, CNT) is integrally provided on the downstream side region through the treated water passing through the flotation tank 3. As shown in Fig. Carbon nanotubes (CNTs) are hexagons with six carbon atoms connected to each other by SP2 bonds, and have a long diameter of several nanometers, which is advantageous in high adsorption efficiency.

2 shows a flotation tank 3 having a top-down type adsorption filtration tank 11 integrally provided in a flotation tank lower region 3a such that the process water passes through the carbon nanotube by gravity and removes the hobby material .

For reference, the region of the floating tank 3 in the dissolved air floating apparatus is defined in the present specification. Referring to FIGS. 2 and 3, the separating tank 3 includes a separating basin region where flocs are lifted and removed from a contact tank region into which fine bubbles are injected, And the entire area from the zone 4 to the area 3b where the process water flows in the upward flow is defined as the floating tank 3 area.

The top-down type adsorption filtration tank 11 includes a porous CNT panel 11a in which a plurality of plate-like CNT panels 11a are stacked in layers, preferably a plurality of holes 11b, and a porous CNT panel 11a, And the holes 11b are stacked asymmetrically so that they do not coincide with each other in the vertical direction.

It is preferable that the CNT panel of the top-down type adsorption filtration tank 11 is a porous CNT panel having a plurality of holes 11b formed in the panel in order to suppress excessive filtration resistance. The holes 11b of the adjacent porous CNT panels may be asymmetrically arranged in the vertical direction because the holes 11b of the porous CNT panels 11a and 11b are vertically aligned with each other. It is preferable that the CNT panel 11a is laminated so as to be disposed. Thus, appropriate filtration resistance and adsorption efficiency can be obtained.

Thus, even if the adsorption filtration tank in which the CNT panels 11a are laminated is provided below the float tank 3, sufficient adsorption filtration efficiency can be obtained without securing a large depth of the stacked area, It is possible to prevent the problem of CAPEX increase due to the increase of the depth of the cap.

In addition, the top-down type adsorption filtration tank 11 may be provided in a form filled with a plurality of media type CNT blocks that are not of a CNT panel type, and may be provided at a height of 0.5 to 2 m. The shape of the CNT block of the filter medium type will be described in more detail below in the bottom up adsorption filtration tank 12.

The top-down type adsorption filtration tank 11 is an apparatus in which the process water is passed through the carbon nanotubes by gravity to remove the hobby material. The operation mode and the treatment efficiency are stable. However, in order to clean the downflow type adsorption filtration tank 11, There may be a problem that the entire process is stopped and then backwashed, so that it is possible to introduce another type adsorption filtration tank as required.

3 shows a state in which the adsorption filtration tank 10 is moved upward in the upward flow region 3b of the float tank 3 so that the treated water can be removed while passing through the carbon nanotubes in the process of being transported to the later stage of the floating tank 3. [ The adsorptive filtration apparatus according to the present invention comprises:

The bottom-up type adsorption filtration tank 12 has a structure in which a plurality of media type CNT blocks 12a are filled in the detachment prevention film 12c. The CNTs have a high adsorbing ability and are a harmful heavy metal substance present in the water, It removes toxic substances such as substances, pesticides, environmental hormones, disinfection byproducts and kills pathogenic microorganisms. It can be adsorbed 3 times more efficiently than CNT block (12a).

The bottom-up type adsorption filtration tank 12 is somewhat less natural than the gravity-type operation mode than the top-down type adsorption filtration tank 11, and the treatment efficiency is low. However, the entire backwashing apparatus for the dissolved air is not stopped by using the backwashing nozzle 12c There is an advantage that it can be cleaned.

FIG. 4 is a schematic view illustrating a dissolved air floating apparatus including a top-up type adsorption filtration tank 11 and a bottom-up type adsorption filtration tank 12 in a floating tank 3 according to an embodiment of the present invention, A first flow directed to the purified water tank 4 via the tank 3 and a second flow directed toward the purified water tank 4 through the top of the floatation adsorption tank 11 in the floatation tank 3 and a second flow directed toward the purified water tank 4, The third flow directed to the water purification tank 4 through the filtration tank 12 and the fourth flow directed to the water purification tank 4 via the top-up adsorption filtration tank 11 and the bottom-up adsorption filtration tank 12 in the floatation tank 3 are selected .

According to the state of the raw water, if the removal of the hobby material is not necessary, the treated water is collected along the collector pipe 21 provided on the bottom of the floating tank 3, and is discharged to the outside through the second transfer pipe through the water purification tank 4 . The second flow directed to the water purification tank 4 via the top-down absorption filtration tank 11 is directed to the water purification tank 4 through the first conveyance pipe and is directed toward the water purification tank 4 via the bottom- The flow is supplied to the bottom-up adsorption filtration tank 12 through the control of the second valve in the second conveyance pipe communicated with the process water collected through the collection pipe 21.

Therefore, the flow of the treatment water can be controlled to the first to fourth flows according to the temporary problem or situation, and the operation cost can be reduced according to the operation optimization.

In another embodiment of the present invention, there is provided a method of separating contaminants, comprising: a pretreatment step (S10) of mixing raw water containing a contaminant and a flocculant to form a flock in which a contaminant and a flocculant are combined; The process step S20 of floating the carbon nanotubes through the pressurized water injection containing the carbon nanotubes and the floating step S20 is carried out by passing the carbon nanotube through the adsorption filtration tank And an adsorption filtering step (S30) for passing the humic substances (10) through the adsorption filtering step (S30) to remove the hobby substances.

The pretreatment step S10 is a step of bringing raw water into which the coagulant has been introduced into the mixing tank 1 through the gate of the mixing tank 1 or introducing raw water into the mixing tank 1, The stirrer provided on the upper portion of the mixing tank 1 is operated so that the foreign substances contained in the raw water and the flocculant are mixed.

Subsequently, when raw water flows into the flocculation tank 2 adjacent to the mixing tank 1 through the upper and / or lower part of the mixing tank 1, an agitator installed on the flocculation tank 2 is operated A flock is formed by the coagulation action between the foreign matter contained in the raw water and the flocculant.

When the flocculant formed in the pretreatment step S10 with the raw water flows into the floating tank 3 adjacent to the flocculation tank 2 through the lower part of the flocculation tank 2, Water containing high pressure (about 3 to 7 bar) of dissolved air is supplied from the tank through the nozzle. Minute bubbles are generated when water containing dissolved air is injected through the nozzle, and fine bubbles are supplied into the flotation tank 3 to stick to the flocs. Then, the floats are floated (S20) in which the floats are floated above the floating tank (3), and the floats are tilted by the skimmer installed on the floating tank (3) and can be discharged to the outside.

The treated water that has undergone the first purification treatment through the floating step S20 includes a downward adsorption filtration step S31 in which the deodorant is removed while passing through the carbon nanotubes by gravity in the downstream region, The adsorbing and filtering step S30 is performed through the upward adsorption filtering step S32 in which the hobby materials are removed while passing through the CNT block 12a of the media type in the direction of the adsorption filter 4 and into the water purification tank 4 through the adsorption filtering step S32.

The water purification method of the present invention is characterized in that the adsorption filtration step (S30) is not performed, or only the downward adsorption filtration step (S31), the upward adsorption filtration step (S32), or the downward adsorption filtration step (S31) And the upward adsorption filtering step (S32).

The present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such modifications are within the scope of protection of the present invention.

1: coagulation tank 2: mixing tank
3: Floating column 3a: Lower area
3b: Upstream area 4: Water purification tank
10: adsorption filtration tank 11: top-down adsorption filtration tank
11a: CNT panel 11b: hole
12: Bottom-up adsorption filtration tank 12a: CNT block
12b: a separation preventing film 12c: a backwash nozzle
21: house water pipe 22: first transfer pipe
22a: first valve 23: second transfer pipe
23a: the second valve

Claims

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An agglomeration tank 2 for mixing raw water and a flocculant to mix raw water and foreign matter of the raw water that has passed through the agitation tank 1 to form a flock; (3) in which foreign substances are floated by minute bubbles generated when pressurized water containing supersaturated dissolved air is injected into a raw water, and the treated water passing through the floating tank (3) In a dissolved air flotation (DAF) apparatus including a water tank 4,
An adsorption filtration tank 10 equipped with a carbon nanotube (CNT) is integrally provided in a region downstream of the treated water passing through the floating tank 3,
The adsorption filtration tank (10)
A top-down type adsorption filtration tank (11) integrally provided in the flotation tank lower region (3a) such that the treated water passes through the carbon nanotubes by gravity to remove the tastant material; And the adsorption filtration tank 10 is connected to the upflow region 3b at the rear end of the float tank 3 so that the treated water is removed while passing through the carbon nanotubes in the course of being transported to the later stage of the floating tank 3. [ And a bottom-up adsorption filtration tank (12)
The top-down type adsorption filtration tank 11 is formed by stacking a plurality of plate-type CNT panels 11a or a plurality of media type CNT blocks 12a,
The CNT panel 11a is a porous CNT panel in which a plurality of holes 11b are formed and the holes 11b are formed such that the holes 11b do not coincide vertically between adjacent porous CNT panels 11a Asymmetrically,
The bottom-up type adsorption filtration tank 12 is filled with a plurality of media-type porous CNT blocks 12a,
A backwashing nozzle 12c is provided under the upflow type adsorption filtration tank 12 to perform forward washing by spraying air or water.
A first transfer pipe 22 provided at the downstream side of the top-down type adsorption filtration tank 11 for transferring the treated water having passed through the top-down type adsorption filtration tank 11 to the water purification tank 4, A first valve (22a) for interrupting the flow of the treated water in the treatment tank (22); A collecting pipe (21) provided on a bottom surface of the floating tank (3) above the top of the adsorption filtration tank (11) and collecting treated water having passed through the floating tank (3); And a second flow path for communicating the treated water having passed through the flotation tank 3 to the upward flow region 3b or the water purification tank 4 provided with the bottom up type adsorption filtration tank 12, A transfer pipe 23; And a second valve (23a) for interrupting the flow of the treated water in the second transfer pipe (23)
Characterized in that the flow from the floating tank (3) to the water tank (4) can be selectively controlled according to the state of the raw water.

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A pretreatment step (S10) of mixing the raw water containing the pollutant with a flocculant to form a flock in which the pollutant and the flocculant are combined;
A floatation step (S20) of injecting pressurized water containing supersaturated dissolved air into the raw water having flowed into the floating tank (3) to float the float; And
The treated water after the floating step S20 is passed through an adsorption filtration tank 10 integrally formed on the downstream side region of the floating tank 3 and equipped with carbon nanotubes (CNT) (S30) which removes the adsorbent,
The adsorption filtration step (S30)
A downwardly adsorbing filtration step (S31) in which the treated water is removed by gravity while passing through a top-down adsorption filtration tank (11) provided integrally with the flotation tank (3) lower region (3a); And
A bottom up type adsorption filtration tank 12 which is integrally provided in an upflow area 3b at the rear end of the float tank 3 and is filled with a plurality of media type CNT blocks 12a during the process of transporting the treated water to the downstream, And an upward adsorption filtering step (S32) in which the hobby substance is removed while passing through the filter
The top-down type adsorption filtration tank 11 is formed by stacking a plurality of plate-type CNT panels 11a or a plurality of media type CNT blocks 12a,
The CNT panel 11a is a porous CNT panel in which a plurality of holes 11b are formed and the holes 11b are formed such that the holes 11b do not coincide vertically between adjacent porous CNT panels 11a Asymmetrically,
The bottom-up type adsorption filtration tank 12 is filled with a plurality of media-type porous CNT blocks 12a,
A backwashing nozzle 12c is provided under the upflow type adsorption filtration tank 12 to perform forward washing by spraying air or water.
A first transfer pipe 22 provided at the downstream side of the top-down type adsorption filtration tank 11 for transferring the treated water having passed through the top-down type adsorption filtration tank 11 to the water purification tank 4; A first valve (22a) for interrupting the flow of the treated water in the first treatment chamber (22); A collecting pipe (21) provided on a bottom surface of the floating tank (3) above the top of the adsorption filtration tank (11) and collecting treated water having passed through the floating tank (3); And a second flow path for communicating the treated water having passed through the flotation tank 3 to the upward flow region 3b or the water purification tank 4 provided with the bottom up type adsorption filtration tank 12, A transfer pipe 23; And a second valve (23a) for interrupting the flow of the treated water in the second transfer pipe (23)
Characterized in that the flow from the floating tank (3) to the water tank (4) can be selectively controlled according to the state of the raw water.

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