KR101718828B1 - Wastewater Treatment System Having High Efficiency Using Dissolved Carbon Dioxide Flotation and Carbon Dioxide Micro Bubbles - Google Patents

Abstract

The present invention relates to a high-efficiency floatation-separation wastewater treatment system using carbon dioxide microbubbles, the system comprising: a mixing tank which includes a wastewater incoming pipe to bring in wastewater, and a purified water outgoing pipe to discharge treated purified water; a carbon dioxide microbubble supply means which injects carbon dioxide microbubbles into the wastewater introduced through the wastewater incoming pipe to adsorb and coagulate colloidal particles; and a sludge discharge unit which communicates with an upper end of the mixing tank to isolate and discharge flocs floated on the surface of the water, wherein the microbubble supply means comprises: a gas injector which includes a water incoming pipe and a gas suction opening at a rear end thereof; and a microbubbles nozzle which includes a pump located at a front end of the gas injector to split the carbon dioxide microbubbles contained in a fluid discharged from the pump and inject them into the mixing tank. Accordingly, the present invention can remove colloidal materials present in the wastewater by adjusting the pH range of the colloidal materials to a surface potential capable of adsorption and coagulation without using a chemical coagulant and an auxiliary coagulant.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-efficiency wastewater flotation water treatment system using carbon dioxide microbubbles,

The present invention relates to a highly efficient wastewater flotation separation and treatment system using carbon dioxide microbubbles, and more particularly, to a method and system for separating and purifying colloidal substances contained in wastewater without using a chemical flocculant or an aggregation aid using carbon dioxide, The present invention relates to a highly efficient wastewater separation and water treatment system using carbon dioxide microbubbles in which carbon dioxide is saturated and supplied in order to maximize its efficiency.

In general, the colloidal particles contained in the wastewater have a negative surface charge, the size is very small, 0.01 to 1.0 μm, and the electrical repulsion between particles is much larger than the attraction force (van der Waals force) It is not easy to remove by agglomeration / sedimentation or coagulation / floatation because it is not good.

Here, the "adsorption and aggregation of the colloidal particles" has the same negative surface charge, so that the colloid system in a stable state is destabilized, and the colloid particles collide with each other over the electrical repulsive force to grow into one large particle, .

The zeta potential of the colloid to be removed from the water is -10 mV or less. The zeta potential of the colloid should be -10 mV to +10 mV, which is capable of binding (adsorbing) It is necessary to neutralize the charge to adsorb and aggregate by the attractive force between the dispersed colloidal particles, so that it can be removed by precipitation or floating separation.

In order to neutralize the charge on the surface of the particles to be adsorbed, a coagulant such as aluminum and iron salts is generally used together with a coagulant aid including a polymer. However, these flocculants are eventually foreign matter, and the amount of sludge is increased as the flocculant is used, which increases the cost of treating wastewater.

Korean Patent Laid-Open Publication No. 10-2013-0025742

It is an object of the present invention to provide a highly efficient wastewater flotation separation system using carbon dioxide microbubbles capable of removing the colloidal substances contained in wastewater without using chemical flocculants and coagulant aids, And to provide a water treatment system.

According to an aspect of the present invention, there is provided a mixing tank having a wastewater inlet pipe for introducing wastewater and a purified water discharge pipe for discharging the purified water; Carbon dioxide micro-bubble supplying means for injecting micro-bubbles of carbon dioxide into the wastewater introduced through the wastewater inlet pipe to adsorb and coagulate the colloidal particles; And a sludge discharging unit communicating with the upper end of the mixing tank for separating and discharging floc floating above the water surface; Wherein the carbon dioxide micro bubble supplying means includes: a gas injector having a water inlet pipe and a gas inlet port at a rear end side; A micro-bubble nozzle injecting carbon dioxide micro-bubbles contained in a fluid located in a front end of the gas injector and a fluid discharged from the pump into a mixing tank; The present invention provides a highly efficient wastewater floating separation and water treatment system using carbon dioxide microbubbles.

According to a preferred aspect of the present invention, the gas injector includes a front end portion where the gas inlet is located and a lower portion that extends from the front end portion, and a ratio of the front end portion to the bottom portion may be 1: 5.

According to a preferred aspect of the present invention, the gas injector includes: a first tube having a cover having one end connected to the pump and the other end formed with a gas inlet hole; A second tube which is partly inserted through the cover of the first tube and eccentrically disposed on one side of the cover; A carbon dioxide inflow passage provided in a gap between an inner circumferential surface of the first tube and an outer circumferential surface of the second tube and communicating with a gas inflow hole of the first tube to supply carbon dioxide into the first and second tubes; A check valve installed on the carbon dioxide inflow passage to allow the inflow of carbon dioxide and shut off the discharge of the internal fluid; . ≪ / RTI >

According to a preferred aspect of the present invention, the gas injector includes: a first tube having a cover having one end connected to the pump and the other end formed with a gas inlet hole; A second tube part of which is partially penetrated through the cover of the first tube; And a gas inlet pipe connected to the gas inlet hole; A check valve installed inside the gas inlet pipe to allow the inflow of carbon dioxide and shut off the discharge of the internal fluid; . ≪ / RTI >

According to a preferred aspect of the present invention, the wastewater flowing into the wastewater inflow pipe and the carbon dioxide micro bubbles flowing through the fine bubble nozzle are installed in the mixing tank in a short time, And may further include a partition wall to be brought into contact therewith.

According to a preferred aspect of the present invention, the purified water discharge pipe may further include a circulation line installed to supply a portion of purified water to the gas injector.

According to a preferred aspect of the present invention, the apparatus may further include a water separator provided between the gas injector and the pump.

The high efficiency wastewater flotation separation and treatment system using carbon dioxide according to an embodiment of the present invention is different from the flotation separation method using the conventional chemical flocculant and coagulant assistant by merely injecting carbon dioxide into wastewater without using coagulant, There is an effect that the colloidal particles can be removed by adjusting the pH range of the substance to be adsorbed and surface potentials capable of aggregating with each other.

Particularly, by supplying carbon dioxide in the form of micro-saturation, the efficiency can be maximized. Accordingly, the amount of sludge separated and separated from the sludge can be reduced, and the cost for sludge disposal can be reduced.

1 is a schematic diagram schematically showing a highly efficient wastewater flotation separation and treatment system according to an embodiment of the present invention.
2 is a perspective view showing the carbon dioxide micro bubble supplying means of FIG.
3 is a graph showing the change in surface zeta potential according to the pH of the colloidal material.
4 is a perspective view illustrating an embodiment of the gas injector of FIG.
5 is a sectional view taken along the line I-I 'of FIG.
6 is a cross-sectional view showing another embodiment of the gas injector of FIG.
Fig. 7 is an enlarged view of the main part of Fig. 6. Fig.
8 is a cross-sectional view taken along line II-II 'of FIG.
Fig. 9 is a cross-sectional view showing another embodiment of the gas injector of Fig. 2;
Fig. 10 is a cross-sectional view schematically showing the check valve of Fig. 6; Fig.
Fig. 11 is a plan view showing an embodiment of the check valve of Fig. 6; Fig.
12 is a plan view showing another embodiment of the check valve of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the following embodiments.

The embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements. In the drawings, like reference numerals are used throughout the drawings.

In addition, to include an element throughout the specification does not exclude other elements unless specifically stated otherwise, but may include other elements.

Referring to FIG. 1, the high efficiency wastewater flotation water treatment system of the present embodiment includes a mixing tank 60, a carbon dioxide micro bubble supplying means 100, and a sludge discharging portion 32.

The mixing tank 60 is a place where the wastewater and carbon dioxide micro bubbles are introduced and mixed, respectively. The mixing tank 60 has a wastewater inlet pipe 10 for introducing the wastewater into the internal space and a purified water discharge pipe 20 for discharging the water purified water to the outside. At this time, the wastewater inlet pipe 10 and the purified water outlet pipe 20 may be disposed opposite to each other at the lower end of the mixing tank 60. The pH sensors 11 and 21 Respectively.

The circulation line 41 may be installed in the purified water discharge pipe 20 to supply a portion of the purified water to the gas injector of the carbon dioxide fine bubble supplying means 100 described later. In FIG. 1, reference numeral 43 denotes a pump for pumping an integer to the gas injector, and reference numeral 42 denotes an inlet pipe as a connection line for supplying the purified water introduced through the pump 43 to the gas injector.

A partition wall 63 may be provided in the mixing tank 60. The partition wall 63 generates adsorption and agglomeration regions having a limited area in the mixing tank 60 so that the wastewater flowing through the wastewater inflow pipe 10 and the carbon dioxide microbubbles flowing through the fine bubble nozzle So as to enhance the adsorption and flocculation effect of the colloidal particles 1. [ Here, reference numeral 62 denotes an integer separation region inside the mixing tank 60 divided by the partition wall 63. [

The carbon dioxide micro-bubble supplying means 100 injects microbubbles of carbon dioxide into the wastewater flowing into the mixing tank 60 through the wastewater inlet pipe 10 to adsorb and coagulate the colloidal particles 1.

Conventional carbon dioxide micro bubble supplying means are combined in the order of pump, gas injector, mixing tank and micro bubble nozzle. In this case, in order to secure the inflow amount of carbon dioxide, the pressure difference between the gas injector and the gas injector must be large. In the conventional carbon dioxide micro bubble supplying means, the gas injector is located at the rear end of the pump. The flow rate of the fluid mixed with water and carbon dioxide decreases as the fluid passes through the inside of the gas injector and the amount of carbon dioxide sucked into the gas injector is also reduced.

In order to compensate for the amount of carbon dioxide sucked in, a separate gas suction pump is installed, which increases the installation and maintenance costs, and the opposite pressure of the gas injector affects the pump, thereby causing damage to the pump impeller .

2, the carbon dioxide micro-bubble supplying means 100 of the present embodiment further comprises a micro-bubble generating unit 120 for generating micro-bubbles of carbon dioxide discharged from the gas injector 140, the pump 110 and the pump 110, Bubble nozzles 150 injected into the micro bubble nozzles 60 are sequentially connected. In particular, since the gas injector 140 is located at the front end of the pump 110, the flow rate of the fluid flowing through the gas injector 140 is increased by using the suction and discharge pressures of the pump 110, It can be performed more smoothly. In addition, it is possible to downsize the pump 43 installed to introduce the purified water from the circulation line, which will be described later.

The carbon dioxide supply unit 200 may be connected to the gas inlet 141 provided in the gas injector 140 to supply carbon dioxide through the gas inlet pipe 210. The carbon dioxide acts to artificially lower the pH of the water when it is injected into water, thereby increasing the adsorption and coagulation efficiency of the colloidal material. Further, even though the standard gas (99% or more) having high purity is easy to handle with a typical inert gas, the carbon dioxide is comparatively inexpensive and has excellent economical efficiency compared with the conventional coagulant in terms of maintenance cost.

In the present invention, not only the carbon dioxide is supplied, but the microbubbles are saturated and supplied.

Referring to FIG. 3, the pH range at zeta potential (-10 to 10 mV) for adsorption and aggregation of colloidal substances with each other is pH 5 to 6.5. When carbon dioxide is injected to lower the pH of the wastewater, The amount of injection can vary depending on the nature of the wastewater.

For example, the amount of carbon dioxide may preferably be 0.5 to 1.0% of the flow rate of the wastewater. If the amount of carbon dioxide exceeds 1.0% and the amount of carbon dioxide is injected, the pH of the wastewater is lowered below the reference value of 5, and the zeta potential increases by 10 mV or more, so that the potential of the surface of the colloidal particle (1) The adsorption and agglomeration of the colloidal particles may be difficult due to the anode repulsion force. In addition, even when the amount of carbon dioxide injected is less than 0.5%, the pH of the wastewater does not decrease to 6.5 or less, so that the colloidal particles can not be adsorbed properly.

As described above, according to this embodiment, unlike the float separation method using the conventional chemical flocculant and coagulation assistant, it is possible to use a method of DAF (Dissolved Carbon Dioxide Flotation) using carbon dioxide microbubbles without using a coagulant, Not only the mixing efficiency with the wastewater can be increased but also the pH range of the colloidal material in the wastewater can be adjusted to a range in which the surface potentials capable of adsorption and flocculation can be set to each other depending on the nature of carbon dioxide.

4 and 5, the gas injector 140 according to the present embodiment has a vertical body 142 having a fluid passage 142a formed therein, unlike a venturi type injector, So that the water introduced through the purified water inflow pipe 42 on the upper side of the body 142 can be supplied to the outside of the body 142 at a faster time than the carbon dioxide introduced through the gas intake port 141 To be mixed. Here, reference numerals 143 and 144 denote flange portions for connecting upper and lower lines, respectively, and the flange portions 143 and 144 have a water inlet 143a and a fluid outlet 144a, respectively. Reference numeral 145 denotes a reinforcing support.

The body 142 of the gas injector 140 may be divided into a front end portion where the gas intake port 141 is located and a lower portion that extends downward from the front end portion. . The gas injector 140 of this embodiment can sufficiently maintain the inflow amount of carbon dioxide even if the front end portion of the body 142 is designed to be short by the pump 110 positioned at the rear end.

At this time, the length ratio between the front end portion and the bottom portion of the body 142 may be preferably 1: 5. If the fluid passage 142a under the body 42 is extended, the inflow amount of the carbon dioxide can be improved by about 30% compared to the conventional venturi type injector. At this time, if the length ratio between the front end portion and the bottom portion of the body 42 is larger than 1: 5, the gas inflow amount becomes larger. On the contrary, the efficiency of mixing carbon dioxide and water and the effect of bubble atomization described below may be relatively reduced.

In addition, in the present embodiment, since the body 142 of the gas injector 140 is formed vertically and the lower portion is longer, the mixture of carbon dioxide and water becomes easier, and a mixture of carbon dioxide and water moves downward, The size of the carbon dioxide bubbles is minimized.

At this time, the mixed fluid moving from the gas injector 140 to the lower end of the body 142 undergoes continuous contraction / expansion / explosion of the gas due to cavitation, so that the size of the carbon dioxide bubbles mixed into the fluid becomes minute. Since the lower portion of the front end of the body 142 is designed to be relatively long, the mixed fluid of the gas and water flowing into the body 142 can maintain the cavitation force for a relatively long period of time .

Accordingly, unlike the conventional venturi type gas injector, the present embodiment can increase the inflow amount of carbon dioxide through the gas intake port 141 without using a separate gas suction pump.

Also, in the case of the present embodiment, since a small bubble of about 300 mu m flows into the pump 110, it is possible to solve the pump efficiency reduction problem that is caused by locally staying the bubble in the pump impeller.

The air injector 140 may further include a connection pipe 130 for connecting the pump 110 to the rear end of the air injector 140. The connection pipe 130 may be provided with a horizontal pipe An oil water separator (not shown) can be installed in the horizontal pipe. The oil water separator serves to pass small carbon dioxide bubbles and to remove large carbon dioxide bubbles. The oil water separator further prevents a pump efficiency reduction problem caused by a large amount of carbon dioxide bubbles remaining in the pump impeller.

As described above, the carbon dioxide bubbles introduced by the air injector 140 are secondarily mixed by the pump impeller when they are moved to the pump 110, and can be further atomized and compressed to 100 μm or less. Then, the carbon dioxide bubbles are superfine to 5 to 20 탆 and can be discharged to the mixing tank 60 while passing through the fine bubble nozzle 150.

The sludge discharging portion 32 communicates with the upper end of the mixing tank 60. When the colloid particles 1 are adsorbed and agglomerated with each other, microbubbles are adsorbed together, and lighter floc particles float on top of the mixing tank 60, And the flock is collected and discharged through the skimmer 50 installed at the upper end of the mixing tank 60. At this time, a hopper 33 is formed at the lower end of the sludge discharging part 32 so that the sludge can be discharged more effectively.

6 to 8, a gas injector 1400 according to another embodiment of the present invention includes a gas injector 1400 having one end connected to the pump 110 and the other end formed with a gas inlet hole 1423, And a second tube 1421 having a relatively smaller diameter than the tube 1422 and the first tube 1422 and partially penetrating the cover 1422b of the first tube 1422. Here, reference numeral 1422a denotes a vertically elongated body of the first tube. At this time, the gas inflow hole 1423 is eccentrically formed at one edge of the cover 1422b, and the second tube 1421 is formed at a position corresponding to the gas inflow hole 1423 at the time of engagement with the first tube 1422, And is eccentrically coupled to one edge of the second side wall 1422b.

A carbon dioxide inflow passage 1450 is formed in the gap between the inner circumferential surface of the first tube 1422 and the outer circumferential surface of the second tube 1421. The lower end of the carbon dioxide inflow passage 1450 is opened, And the upper end communicates with the gas inflow hole 1423 of the first pipe 1422 and the gas inflow pipe 1423 of the carbon dioxide supply part 200 is connected to the gas inflow hole 1423. [ 210 can be connected.

A check valve 1460 is provided on the passage provided through the gas inlet hole 1450.

In the case of Embodiment 1, since the body of the gas injector is curved, the gas inlet is formed perpendicularly to the body, and the carbon dioxide flows in a direction perpendicular to the direction in which the water is introduced. The fluid pressure inside the body may be lost by interrupting the flow, which may result in a slowing of the flow rate and a decrease in the inflow of carbon dioxide.

However, since the gas injector of this embodiment has the same flow direction of the water and the inflow direction of carbon dioxide, the inflow of the gas does not interfere with the flow of water, so that the internal fluid pressure loss is small and the flow rate is not lowered.

The check valve 1460 can adjust the amount of carbon dioxide that is introduced when necessary. In Fig. 6, reference numerals 1430 and 1440 denote flange portions for connecting upper and lower pipes, respectively.

9 shows another embodiment of the gas injector of the present invention. A detailed description of the structure similar to the above-described embodiment will be omitted in order to avoid redundancy.

9, a gas injector 1400 'according to another embodiment of the present invention includes a first pipe 1420' having a cover 1422b having one end connected to the pump 110 and the other end having a gas inlet hole 1423 formed therein, And a second tube 1421 having a relatively smaller diameter than the first tube 1422 'and the first tube 1422 and partially penetrating the cover 1422b of the first tube 1422'. Further, a gas inlet pipe 210 is connected to the gas inlet hole 1423. A check valve 1460 is installed in the gas inlet pipe 210. In this case, the second tube 1421 can be installed in the center of the cover 1422b of the first tube 1422 'without eccentricity, which can provide a more stable structure.

10 and 11, the check valve 1460 includes a pair of unidirectionally openable blades 1462 and 1463 that are fitted and coupled on a passage 1464 formed by a gas inflow hole, a unidirectional openable blades 1462, 1463, respectively, as shown in Fig.

The unidirectional openable blades 1462 and 1463 are disposed opposite to each other with respect to the spring 1461 and are biased by a spring 1461 to allow carbon dioxide to flow from the outside and to prevent the discharge of fluid from the second tube 1422 And is opened only in a direction in which carbon dioxide is supplied.

At this time, as shown in FIG. 10, the inner walls of the pair of unidirectionally openable blades 1462 and 1463 may be formed into a tapered shape that widens from the inside to the outside, thereby effectively preventing the internal fluid from being separated.

The body portion 1464 may be formed to conform to the shape of the passage by the gas inflow hole, and may be formed of, for example, a cylindrical tube, or a tube having a rectangular cross section as shown in FIG. 12, In this case, the check valve 1460 'of FIG. 10 also has a rectangular shape with unidirectionally openable blades 1462' and 1463 '.

A method for treating wastewater using the high-efficiency wastewater flotation separation and treatment system of the present embodiment having the above configuration will be described.

First, the pH of the wastewater flowing into the mixing tank 60 is measured. The pH of the wastewater is set to 5 to 6.5 by adding carbon dioxide to the wastewater according to the measured pH of the wastewater, adding the wastewater to the wastewater after saturating the micro-particles with the carbon dioxide micropore.

Therefore, adsorption and coagulation between the colloidal organic compounds of the wastewater are formed by carbon dioxide micro bubbles, flocs are formed, and the flocs gradually become larger and become lighter by the carbon dioxide bubbles adsorbed together and floated on the surface of the water.

Next, the floc floated by the DAF method is sent to the sludge discharge portion 32 using the skimmer 50, and the water treated at the bottom is separated from the purified water discharge portion 20 of the mixing tank 60 .

The present invention is not limited by the above-described embodiment and the accompanying drawings, but is intended to be limited by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

10: Waste water inflow pipe
20: purified water outlet pipe
32: sludge discharge portion
41: circulation line
50: Skimmer
60: Mixing tank
100: Carbon dioxide micro bubble supplying means
110: pump
140, 1400: gas injector
150: fine bubble nozzle
200:
210: gas inlet pipe
1422, 1421: First and second pipes
1460: Check valve

Claims (8)

delete delete A mixed tank having a wastewater inlet pipe for introducing the wastewater and a purified water discharge pipe for discharging the purified water;
Carbon dioxide micro-bubble supplying means for injecting micro-bubbles of carbon dioxide into the wastewater introduced through the wastewater inlet pipe to adsorb and coagulate the colloidal particles; And
A sludge discharge portion communicating with an upper end of the mixing tank for separating floc floated above the water surface and discharging the floc; Lt; / RTI >
Wherein the carbon dioxide micro bubble supplying means comprises: a gas injector having a water inlet pipe and a gas inlet port on a rear end side; A micro-bubble nozzle injecting carbon dioxide micro-bubbles contained in a fluid located in a front end of the gas injector and a fluid discharged from the pump into a mixing tank; / RTI >
The gas injector includes:
A first pipe having one end connected to the pump and the other end formed with a cover having a gas inlet hole;
A second tube which is partly inserted through the cover of the first tube and eccentrically disposed on one side of the cover; And
A carbon dioxide inflow passage provided in the gap between the inner circumferential surface of the first tube and the outer circumferential surface of the second tube and communicating with the gas inflow hole of the first tube to supply carbon dioxide into the first and second tubes;
A check valve installed on the carbon dioxide inflow passage to allow the inflow of carbon dioxide and shut off the discharge of the internal fluid; / RTI >
Wherein the inflow direction of the water flowing through the first pipe and the inflow direction of the gas flowing through the gas inflow hole are the same, and the high efficiency wastewater floating water treatment system using the carbon dioxide microbubbles. A mixed tank having a wastewater inlet pipe for introducing the wastewater and a purified water discharge pipe for discharging the purified water;
Carbon dioxide micro-bubble supplying means for injecting micro-bubbles of carbon dioxide into the wastewater introduced through the wastewater inlet pipe to adsorb and coagulate the colloidal particles; And
A sludge discharge portion communicating with an upper end of the mixing tank for separating floc floated above the water surface and discharging the floc; Lt; / RTI >
Wherein the carbon dioxide micro bubble supplying means comprises: a gas injector having a water inlet pipe and a gas inlet port on a rear end side; A micro-bubble nozzle injecting carbon dioxide micro-bubbles contained in a fluid located in a front end of the gas injector and a fluid discharged from the pump into a mixing tank; / RTI >
The gas injector includes:
A first pipe having one end connected to the pump and the other end formed with a cover having a gas inlet hole;
A second tube part of which is partially penetrated through the cover of the first tube; And
A gas inlet pipe connected to the gas inlet hole;
A check valve installed inside the gas inlet pipe to allow the inflow of carbon dioxide and shut off the discharge of the internal fluid; / RTI >
Wherein the inflow direction of the water flowing through the first pipe and the inflow direction of the gas flowing through the gas inflow hole are the same, and the high efficiency wastewater floating water treatment system using the carbon dioxide microbubbles. The method according to claim 3 or 4, wherein the mixed water tank is installed in the mixing tank, and the wastewater flowing through the wastewater inflow pipe through the adsorption and condensation region is limited, and the carbon dioxide microbubbles flowing through the micro- Further comprising a partition wall for allowing the carbon dioxide microbubbles to contact with each other more effectively. The system according to claim 3 or 4, further comprising a circulation line installed to supply a portion of the purified water to the gas injector in the purified water discharge pipe. The apparatus according to claim 3 or 4, further comprising a water-oil separator provided between the gas injector and the pump, the water-oil separator being operable to pass small carbon dioxide bubbles and to remove large carbon dioxide bubbles. High Efficiency Wastewater Separation and Water Treatment System Using. The air conditioner according to claim 3 or 4, wherein the check valve includes a pair of unidirectionally openable blades disposed opposite to each other with respect to the spring, wherein the unidirectionally openable bladder includes a tapered inner wall extending from the inside to the outside, Wherein the water separator is formed in a gaseous form.

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