KR20120058172A - Aeration apparatus for sewage treatment and operation methods of the same - Google Patents

Abstract

PURPOSE: An apparatus for an aeration basin and a method for operating the same are provided to eliminate foreign materials attached on a membrane filter by forming spiral flow based on air from an air diffusing member. CONSTITUTION: An apparatus for an aeration basin includes a main body(20), a first air diffusing member(30), a slanted plate member(40), and a second air diffusing member(35). The main body includes a containing space, an inlet, and an outlet. The inlet supplies sewage to the containing space. The outlet discharges the sewage from the containing space to outside. The first air diffusing member is installed at the lower side of the containing space and supplies air to the sewage in the containing space. The slanted plate member is installed at the upper side of the first air diffusing member to guide the movement of air from the first air diffusing member. The second air diffusing member is installed at the upper side of the slanted plate. The second air diffusing member supplies air to the sewage.

Description

Aeration apparatus for sewage treatment and operation methods of the same}

The present invention relates to an aeration tank apparatus and a method of operating the same, and more particularly, an aeration tank apparatus capable of more efficiently treating wastewater by increasing energy efficiency by increasing the time for which the air discharged from the air discharging member contacts the wastewater, and its It is about how to operate.

In general, an activated sludge method mainly using aeration tank for microbial decomposition is mainly used in sewage treatment plants installed in Korea.

The activated sludge method injects air into the sewage water by using a swirl flow type diffuser method and a full aeration type diffuser method, wherein the diffuser method installs an diffuser member for blowing air at the bottom of the aeration tank, Use it to stir the entire aeration tank and to dissolve the air. At this time, the amount of oxygen delivered to the wastewater increases as the air ejected from the diffuser member stays in the wastewater for a longer time, and as the contact area between the air and the wastewater increases.

However, in the acidic method, the air ejected from the acidic member stays in the sewage water for a short time, and thus the oxygen transfer efficiency decreases. Accordingly, the biochemical decomposition degree of the sewage water is weak, and the sewage water treatment efficiency decreases.

The aeration tank adopting the diffuser method has a width and depth ratio of about 2: 1, and the depth of the blower is limited to about 5m because of the capacity of the blower, so the air discharged from the diffuser stays in the aeration tank for only 3 to 4 seconds, and oxygen The transmission capacity is only 5% -8%.

In order to solve the above problem, a method of increasing the air supply amount or decreasing the size of the bubble has been proposed, but this method has a problem in that the amount of power required to supply air increases.

In order to solve the above problem, the present inventors have invented the aeration tank apparatus for increasing the residence time of air by using an inclined plate member installed to be inclined inside the aeration tank, and the apparatus is registered in Korean Patent Registration No. 10-0456087. have.

As shown in FIG. 1, the apparatus includes a main body 11 having an inlet 12 and an outlet 13 formed therein, an inclined plate member 15 provided to be inclined under the main body 11, and an inclined plate member 15. It has a diffuser member 16 installed below.

The wastewater is injected into the main body 11 through the inlet 12. The treated wastewater is discharged to the outside through the discharge port 13.

The air supplied through the diffuser member 16 forms a swirl flow (illustrated by arrows in the figure). That is, the air supplied through the diffuser member 16 moves in the direction of the arrow and contacts oxygen with the wastewater.

On the other hand, reference numeral 17 is a heater for heating air, 18 is a blower for supplying external air, 19 is a cover for covering the main body (11). In addition, T is a thermometer for measuring the temperature of the wastewater, D is a dissolved oxygen meter for measuring the concentration of dissolved oxygen.

In the apparatus 10, the residence period is long because the air supplied through the air diffuser member 16 does not rise vertically and is discharged to the outside, but is discharged to the outside after being moved along the swirl flow and thus, The longer the contact time with wastewater, the higher the oxygen transfer efficiency and the higher the heat transfer efficiency, which transfers the heat of the air into the water.

However, in the apparatus 10, since the inclined plate member 15 and the diffuser member 16 are installed below the main body 11, and the discharge port 13 is formed above the main body 11, Some of the discharged air is discharged from the diffuser member 16 because it is not circulated along the swirl flow and is discharged from the diffuser member 16 and then moved along the swirl flow and then discharged directly through the discharge port 13. There is a problem that does not fully rotate even after one round does not maximize the oxygen transfer efficiency.

The present invention is designed to solve the above problems, it is possible to increase the contact time of the waste water and air more than the conventional aeration tank device, and to provide an aeration tank device and an operation method thereof that can increase the oxygen transfer efficiency accordingly. There is this.

Still another object of the present invention is to give up the air discharged from a separate micro diffuser (second diffuser member) installed near the water surface by using a swirl flow formed by the air discharged from the diffuser member (first diffuser member). In addition to the method of rotating in the space to provide an aeration tank device that can remove the foreign matter attached to the membrane filter using this flow and air and its operation method.

In order to achieve the above object, the aeration tank apparatus according to the present invention, the main body including a receiving space for receiving the wastewater, the inlet for supplying the wastewater to the receiving space, the outlet for discharging the wastewater contained in the receiving space to the outside; A first diffuser member installed at a lower portion of the accommodation space to supply air to the wastewater stored in the accommodation space; An inclined plate member installed to incline on the first diffuser member to guide movement of air discharged from the first diffuser member; And a second diffuser member installed above the inclined plate member and installed behind the discharge port on the swirl flow flow path of the wastewater formed in the receiving space by the air discharged from the first diffuser member and supplying air to the wastewater. .

The bubble of air discharged from the second diffuser member is preferably smaller in size than the bubble of air discharged from the first diffuser member.

In addition, the amount of air discharged from the second diffuser member is preferably smaller than the amount of air discharged from the first diffuser member.

In addition, the second diffuser member is preferably located 50cm to 100cm below the surface of the aeration tank.

Further, the water surface of the aeration tank is above the outlet, and the exhaust pipe for discharging the air in the closed space (A) above the water surface to the outside, the exhaust pipe by using the air pressure of the space (A) The air in space A can be discharged to the outside.

Another aspect of the present invention provides a method of operating the aeration tank apparatus, comprising the steps of: (a) supplying wastewater to the receiving space through the inlet; (b) forming a swirl flow in the accommodation space by supplying air through a first diffuser member installed under the inclined plate member installed to be inclined under the accommodation space; And (c) supplying air through a second diffuser member installed on the inclined plate member but installed rearward on the swirl flow path than an outlet through which wastewater is discharged to the outside.

The step (c) is preferably performed after the swirl flow is formed.

The operation method may include cleaning the filtration membrane by dropping contaminants attached to the filtration membrane, such as the hollow fiber membrane installed in the accommodation space, using the swirl flow.

In addition, the water surface of the aeration tank in the accommodation space is above the outlet, it is preferable to discharge the air in the closed space (A) above the water surface without using a separate discharge device.

Aeration tank apparatus and its operation method according to the present invention has the following effects.

First, it is possible to increase the contact time of the wastewater and air more than the conventional aeration tank device, thereby increasing the oxygen transfer efficiency.

Second, it is possible to remove the foreign matter attached to the membrane filter (filtration membrane) by using the swirl flow formed by the air discharged from the air diffuser member.

1 is a cross-sectional view showing the aeration tank device according to the prior art.
Figure 2 is a cross-sectional view showing the aeration tank device according to a first embodiment of the present invention.
3 is an enlarged view of section III of FIG. 2;
Figure 4 is a cross-sectional view showing the aeration tank device according to a second embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely examples of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

The present invention is an improvement of the invention disclosed in the Republic of Korea Patent Registration No. 10-0456087, it is characterized in that the oxygen transfer efficiency is higher than the aeration tank device disclosed in Patent Registration No. 10-0456087. And, this specification supplements the contents disclosed in Patent Registration No. 10-0456087. However, in the event of a conflict between the contents of the present invention and those disclosed in Patent Registration No. 10-0456087, the contents described in the present specification shall prevail. Although the contents disclosed in Patent Registration No. 10-0456087 are not duplicated for convenience of description, the contents disclosed in Patent Registration No. 10-0456087 should be understood to be included in the present specification.

FIG. 2 is a cross-sectional view showing the aeration tank apparatus according to the first embodiment of the present invention, and FIG. 3 is an enlarged view of part III of FIG.

Referring to the drawings, the aeration tank device 100 is on the body 20, the first and second diffuser members 30 and 35 to supply air to the body 20, and the first diffuser member 30 It includes an inclined plate member 40 provided to be inclined, and an exhaust pipe 26 for discharging air inside the main body 20 to the outside.

The main body 20 includes an accommodation space 21 for receiving the wastewater, an inlet 22 for supplying the wastewater to the accommodation space 21, and an outlet 23 for discharging the wastewater contained in the accommodation space 21 to the outside. Include.

The main body 20 may have a cross section such as square or rectangular or circular, and the width of the main body 20 is preferably about 1 to 2 times the depth of the wastewater, and the depth of the wastewater is maintained at about 5 m. It is preferable.

The receiving space 21 may be provided with a dissolved oxygen measuring device (D) for measuring the concentration of dissolved oxygen, and a thermometer (T) for measuring the temperature of the wastewater.

The main body 20 may be sealed by a cover 25. As an alternative to the cover 25, a water tight cover (not shown) covering the surface of the wastewater may be installed. The water tight cover may increase the water retention time of the air supplied to the wastewater and minimize the contact area between the water surface and the atmosphere to minimize the heat loss of the wastewater, thereby improving the sewage treatment efficiency during the winter when the water temperature falls to low temperatures or below zero.

The inlet 22 supplies the wastewater to the receiving space 21. It is preferable that a plurality of inlets 22 are installed below the inclined plate member 40. In this case, the wastewater introduced through the inlets 22 is inclined plate member together with the air discharged through the first diffuser member 30. After moving in the 40, it rises to the upper portion of the receiving space (21).

The outlet 23 discharges the wastewater from which pollutants (organic and inorganic materials) have been removed to the outside. The outlet 23 may be formed at the upper portion of the receiving space (21). At this time, the outlet 23 is preferably installed below the surface of the waste water, this point is described further below.

The first diffuser member 30 is provided below the inclined plate member 40. The first diffuser member 30 discharges the air supplied via the blower 31, the heater 32, and the pipe 33 into the sewage water. Oxygen in the air supplied to the wastewater is used to decompose pollutants in the wastewater. In order to uniformly supply air into the water of the wastewater, it is preferable that the first diffuser member 30 is elongated in a direction perpendicular to the ground.

The blower 31 is for supplying external air to the first diffuser member 30 installed in the wastewater, and the heater 32 selectively heats the air to maintain the temperature of the wastewater at a temperature suitable for removing contaminants. do. The operation of the heater 32 may be determined in accordance with the temperature of the wastewater measured by the thermometer (T).

The air discharged from the first diffuser member 30 is guided by the inclined plate member 40 to form a swirl flow in the accommodation space 21. The swirl flow is shown by arrows in the figure. On the other hand, the swirl flow is formed in a circular or elliptical, etc., the flow shape of the swirl flow may vary depending on the shape of the receiving space (21).

The second diffuser member 35 supplies external air to the wastewater. In order to uniformly supply air to the wastewater, the second diffuser member 35 is preferably provided long in a direction perpendicular to the ground.

The supply of air through the second diffuser member 35 is preferably made after the swirl flow is made by the first diffuser member 30, but may be simultaneously with the supply of air by the first diffuser member 30. .

The second diffuser member 35 is installed on the inclined plate member 40, and is installed behind the discharge port 23 on the flow path through which the swirl flow formed by the first diffuser member 30 flows. The second diffuser member 35 is preferably installed below a predetermined distance L from the surface of the wastewater, specifically, it is preferably installed below 50 cm to 100 cm. Here, the "rear of the discharge port 23" means that the swirl flows to the place where the second diffuser member 35 is located after passing through the discharge port 23.

Since the second diffuser member 35 is located behind the outlet 23 on the swirl flow path, the air discharged from the second diffuser member 35 rotates at least one wheel to the outside through the outlet 23. Discharged. On the other hand, the conventional aeration tank device 10 may be discharged to the outside without the air discharged from the air diffuser member 16 rotates one wheel, and thus the contact time between the air and the wastewater is not efficient.

On the other hand, the second diffuser member 35 is preferably supplied with air through the pipe 36 branched from the pipe 33, because the blower 31 and the heater 32 can be used in common.

The air discharged from the second diffuser member 35 preferably forms a fine bubble. This is because the air discharged from the second diffuser member 35 must move downward while overcoming the force to rise by the buoyancy. Specifically, the air blower outlet of the second air diffuser member 35 is smaller than the air blower outlet of the first air diffuser member 30, and thus the bubbles of air discharged from the second air diffuser member 35 are the first air diffuser member 30. It is preferred to be smaller than the bubbles of air discharged from.

In addition, the amount of air discharged from the second diffuser member 35 is preferably smaller than the amount of air discharged from the first diffuser member 30. This is because if the amount of air discharged from the second diffuser member 35 is large, the amount of air discharged from the first diffuser member 30 is difficult to form one-way swirling flow (clockwise wastewater flow in the drawing). . The amount of air discharged from the second diffuser member 35 is preferably about 1/2 to 1/3 of the amount of air discharged from the first diffuser member 30.

The inclined plate member 40 is installed to be inclined under the main body 20. The first diffuser member 30 is installed below the inclined plate member 40. One side of the inclined plate member 40 can be installed to be inclined by supporting it with a rod (not shown). The inclined plate member 40 is installed to incline the movement of the air bubbles discharged from the first diffuser member 30 to increase the residence time in water. The inclination preferably forms approximately 5 to 10 degrees with the horizontal plane.

In addition, the inclined plate member 40 is preferably installed so as to be spaced apart from the air blowing port of the first diffuser member 30 by about 20cm ~ 100cm, and is preferably installed so as to be spaced about 20cm ~ 100cm from the inner wall of the main body 20.

The exhaust pipe 26 discharges the air in the space A on the surface of the wastewater to the outside. The space (A) is a space sealed from the outside by the cover 28 is installed on the upper end of the space formed to penetrate the upper surface of the main body (20). On the other hand, as an alternative, although not shown in the figure, the space may be a cover 28 is installed in a space formed to penetrate the cover 25 and sealed from the outside.

The water surface of the wastewater in the space (A) is above the bottom of the cover 25, preferably 10cm ~ 20cm above the bottom of the cover 25. Accordingly, the space A is a space enclosed by the sewage water surface and the cover 28, and the air supplied through the first and second diffuser members 30 and 35 collects in the closed space A. This results in a higher air pressure than the external atmospheric pressure. Therefore, the air in the space A can be discharged to the outside through the exhaust pipe 26 without using a separate discharge device, for example, a fan.

Since the air discharged through the exhaust pipe 26 includes odor, the exhaust pipe 26 is preferably connected to the odor preventing means 27. Odor prevention means 27 is to remove the odor of the air moved through the exhaust pipe 26, the odor prevention means 27 may be used in the soil deodorization, biological adsorption tower and the like.

3 is a cross-sectional view showing the aeration tank device according to a second embodiment of the present invention.

Referring to the drawings, the aeration tank device 100 ′ is disposed on the main body 20, the first and second diffuser members 30 and 35 for supplying air to the main body 20, and the first diffuser member 30. It includes an inclined plate member 40 provided to be inclined, and an exhaust pipe 26 for discharging air inside the main body 20 to the outside. The aeration tank apparatus 100 ′ is the same as the aeration tank apparatus 100 according to the first embodiment except that the hollow tank membrane filter is further provided as compared with the aeration tank apparatus 100 according to the first embodiment. That is, the main body 20, the first and second diffuser members 30 and 35, the inclined plate member 40, and the exhaust pipe 26 are the main body 20 and the first and second diffuser members 30 (the first embodiment) ( 35 and the inclined plate member 40 and the exhaust pipe 26, respectively.

The filtration membrane such as the hollow fiber membrane includes a suction pipe 52 and a filter part 50. When the pressure inside the suction pipe 52 is reduced by using the suction pump P, the wastewater treated through the filter unit 50 is introduced, and foreign substances contained in the wastewater are filtered out during the inflow process. Since the hollow fiber membrane filter is known and can be easily purchased on the market, a description of the structure will be omitted here.

The contaminants filtered in the filtration process of the hollow fiber membrane filter is attached to the filter unit 50. The present invention can remove the contaminants attached to the filter unit 50 by using the water flow and the air generated by the swirl flow formed by the first and second diffuser members 30 and 35. That is, the contaminants attached to the filter unit 50 fall while the filter unit 50 is fluttered by the swirl flow.

Then, the operation of the aeration tank device 100 according to the first embodiment of the present invention will be described.

First, the wastewater is supplied to the accommodation space 21 through the inlet 22. After the wastewater is filled to the accommodation space 21 to a predetermined height, air is supplied through the first diffuser member 30. The external air is moved to the first diffuser member 30 through the blower 31 and the pipe 33 and then discharged into the wastewater. At this time, the temperature of the wastewater may be adjusted by heating the outside air through the outside air via the heater 32.

The air discharged through the first diffuser member 30 moves along the bottom surface of the inclined plate member 40 while forming bubbles. At this time, since the inlet 22 is positioned below the inclined plate member 40, the wastewater discharged from the inlet 22 and the bubbles move along the lower surface of the inclined plate member 40. Subsequently, the bubbles and the waste water are moved in the receiving space 21 while forming a swirl flow.

After the swirl flow is formed, air is discharged from the second diffuser member 35. The amount of air discharged from the second diffuser member 35 is smaller than the amount of air discharged from the first diffuser member 30. In addition, the air discharged from the second diffuser member 35 forms a fine bubble. Therefore, the air discharged from the second diffuser member 35 overcomes the lift force caused by the buoyancy force and moves downward by the swirl flow.

Since the second diffuser member 35 is located behind the outlet 23 on the swirl flow path, the air discharged from the second diffuser member 35 rotates at least one wheel to the outside through the outlet 23. Discharged. On the other hand, the conventional aeration tank device 10 may be discharged to the outside without the air discharged from the air diffuser member 16 rotates one wheel, and thus the contact time between the air and the wastewater is not efficient.

That is, when the same amount of air is injected through the conventional air dispersing member 16 and the first and second air dispersing members 30 and 35 of the present invention, the residence time of the air is The aeration tank apparatus 100 is longer, and thus the aeration tank apparatus 100 of the present invention is more efficient.

After sufficient oxygen is supplied to the wastewater by the swirl flow, the wastewater is discharged to the outside through the outlet 23.

Meanwhile, the air supplied through the first and second diffuser members 30 and 35 is collected in the space A after being used to treat the wastewater, which is spaced by the sewage water surface and the cover 28. Since it is sealed, the air pressure is higher than atmospheric pressure, whereby the air in the space A is discharged to the outside through the exhaust pipe 26. The air discharged through the exhaust pipe 26 is removed odor by the malodor prevention means 27.

20: main body 30: first diffuser member
35: second diffuser member 40: inclined plate member
100, 100 ': Aeration tank device

Claims (9)

A main body including an accommodation space accommodating the wastewater, an inlet for supplying the wastewater to the accommodation space, and an outlet for discharging the wastewater contained in the accommodation space to the outside;
A first diffuser member installed at a lower portion of the accommodation space to supply air to the wastewater stored in the accommodation space;
An inclined plate member installed to incline on the first diffuser member to guide movement of air discharged from the first diffuser member; And,
And a second diffuser member installed on the inclined plate member and installed behind the discharge port on the swirl flow flow path of the wastewater formed in the receiving space by the air discharged from the first diffuser member, and supplying air to the wastewater. Aeration tank device characterized in that. The method of claim 1,
The bubble of air discharged from the second diffuser member is smaller in size than the bubble of air discharged from the first diffuser member. The method of claim 1,
Aeration tank apparatus characterized in that the amount of air discharged from the second diffuser member is smaller than the amount of air discharged from the first diffuser member. 4. The method according to any one of claims 1 to 3,
Aeration device is characterized in that the second diffuser member is located 50cm to 100cm below the water surface of the waste water. 4. The method according to any one of claims 1 to 3,
A cover is installed in a space formed to penetrate the upper surface of the main body or a cover 25 covering the main body to form a closed space A, and the water surface of the wastewater in the space A is the lower surface of the cover. Is located higher up,
An exhaust pipe for discharging air in the space A to the outside is connected to the space A, and the exhaust pipe discharges the air in the space A to the outside by using the air pressure in the space A. Aeration tank device. (a) supplying wastewater to the receiving space through the inlet;
(b) forming a swirl flow in the accommodation space by supplying air through a first diffuser member installed under the inclined plate member installed to be inclined under the accommodation space; And
(c) supplying air through a second diffuser member installed on the inclined plate member but disposed rearward on the swirl flow path than an outlet through which wastewater is discharged to the outside; . The method of claim 6,
The step (c) is the operation method of the aeration tank device, characterized in that after the swirl flow is formed. The method of claim 6,
And cleaning the filter membrane by dropping contaminants attached to the filter membrane installed in the accommodation space using the swirl flow. The method of claim 6,
A cover is installed in a space formed to penetrate the upper surface of the main body or a cover 25 covering the main body to form a closed space A, and the water surface of the wastewater in the space A is the lower surface of the cover. Is located higher up,
An exhaust pipe for discharging air in the space A to the outside is connected to the space A, and the exhaust pipe uses air pressure in the space A without using a separate discharge device. Operation method of the aeration tank device characterized in that the discharge to the outside.

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