KR20190006827A - Aerator using eddy flow - Google Patents

Abstract

The present invention relates to an aeration device using a vortex. The aeration device comprises: an aeration tank storing wastewater; a pump installed inside or outside the aeration tank; a venture pipe connected to the pump; and an air inlet pipe communicating with the venture pipe to introduce outside air. The venture pipe comprises a suction pipe through which the pumped wastewater is sucked, a discharge pipe though which the wastewater is discharged, and a stirring pipe which connects the suction pipe and the discharge pipe and has a relatively small diameter and communicates with the air inflow pipe. A first screw is provided in the suction pipe so that the wastewater sucked into the suction pipe forms a vortex.

Description

[0001] The present invention relates to an aerator using eddy flow,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aeration device, and more particularly, to an aeration device using a vortex capable of generating minute bubbles in an aeration tank for purifying wastewater.

Generally, a method using microbial metabolism activity in organic wastewater treatment is becoming a central technique. That is, by appropriately adjusting the living environment of aerobic or anaerobic bacteria, the organic wastewater is purified by decomposing, accomplishing and re-synthesizing proteins, carbohydrates and the like in the organic wastewater by these microorganisms.

Substrate concentration, PH, temperature, dissolved oxygen (DO), etc. are factors that affect the purification efficiency.

Factors such as double substrate concentration, temperature and pH are due to the inherent properties of wastewater itself, and the external anthropogenic factors are almost unique.

In order to supply such oxygen, a generic oxygen supply device is generally used. The oxygen-fed type oxygen feeder feeds the outside air by a blower (BIOWER) and generates a large number of bubbles by various types of aeration devices provided at the end thereof, thereby causing the bubbles to rise from the bottom of the aeration tank and dissolve in the wastewater.

Activation of microorganisms in the biological treatment process of wastewater plays a significant role in the decomposition of organic matter, so that the increase of the amount of air supplied into the aeration tank and the miniaturization of the bubble particles are the main challenges to increase the activity of microorganisms.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional apparatus for producing a wastewater treatment facility; FIG.

Specifically, the present invention relates to a wastewater treatment facility comprising an aeration tank 10 for cultivating microorganisms in wastewater and decomposing organic matter, and a settling tank 30 for storing wastewater whose organic matter has been decomposed through the aeration tank 10 for a certain period of time to precipitate debris An underwater pump 110 having an inlet port 112 and an outlet port 114 for wastewater is installed on the bottom surface of the aeration tank 10 and different internal diameters are formed in the discharge port 114 (120) having an air diffuser nozzle (122), a pressure fluctuation formed in the air diffuser (120) formed on one side of the diffuser (120) Having a first air inlet pipe (130) provided with a first air inlet port (132) and a second air inlet port (142) having a blower (20) And the air inlet pipe (140) Quot; a wastewater treatment facility having a wastewater treatment facility "

In the above-mentioned prior art, an underwater pump is installed in an aeration tank for removing organic matter by the action of microorganisms cultivated in wastewater. In this process, during the passage of the discharged water through the orifice tube, the natural air supply by the negative pressure and the forced air supply by the forced air blowing are selectively performed So that the use of oxygen can be increased by the minute bubbles, and the driving load and the noise of the blower can be reduced.

However, although the number of bubbles discharged from the wastewater is small, the number of bubbles discharged from the wastewater is small, and the shape of the bubbles is maintained at the initial stage. However, since the bubbles increase in the aeration tank and become large bubbles, they rise faster and can not stay in the aeration tank . This greatly reduces the efficiency of wastewater treatment.

However, there are limitations in the prior art in order to increase the amount of microbubbles generated and further refine the microbubbles.

In other words, in order to inhale more air, the flow rate of water should be increased to increase the natural air supply or the blower to increase the forced air supply.

The use of a blower requires a large capacity, oxygen transfer rate less than 10% in the aeration tank, and a high-pressure facility is required as the depth of the water increases the air pressure.

Further, in the conventional art, it is difficult to further miniaturize fine bubbles.

That is, since the microbubbles are floating at a high rate, the oxygen transfer efficiency is low and more air is supplied, which causes time and cost problems.

- Korean Utility Model Registration No. 20-0380963 (March 29, 2005) "Aeration Devices for Wastewater Treatment Facilities" - Korean Patent No. 10-0925531 (Oct. 30, 2009) "Microbubble Reactor for Wastewater Treatment" - Korean Patent Laid-Open No. 10-2015-0066157 (June 16, 2015) "Micro-bubble generator"

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a venturi tube for aeration, which is capable of increasing the amount of fine bubbles, And to provide an aeration device using the same.

According to an aspect of the present invention, there is provided an aeration device using a vortex, comprising: an aeration tank storing wastewater; a pump installed inside or outside the aeration tank; a venturi pipe connected to the pump; Wherein the venturi pipe connects the suction pipe through which the pumped wastewater is sucked, the discharge pipe to be discharged, the suction pipe and the discharge pipe, has a relatively small diameter, and the air inlet pipe And a first screw may be provided in the suction pipe so that the wastewater sucked into the suction pipe forms a vortex.

At this time, the first screw is a shape in which a plate-shaped blade having a width shorter than the radius of the suction pipe is continuously wound in a spiral shape with respect to the center line of the suction pipe, and the edge of the blade is coupled to the inner peripheral surface of the suction pipe have.

Further, the portion where the suction pipe and the stirring pipe are connected is a tapered shape in which the inner diameter is reduced, and the width of the blade can be reduced by the same ratio.

In addition, a second screw may be further provided in the discharge pipe to maintain the rotational energy of the discharged wastewater.

In addition, the end of the discharge pipe may be formed with a step having a shape with an inner diameter narrowed.

Meanwhile, the air inlet pipe may be shaped to extend into the stirring pipe and be bent so that air flows in the same direction as the flow channel.

According to the present invention constructed as described above, the wastewater sucked into the venturi pipe is made into a vortex before the first screw is passed through the stirring tube, so that the efficiency of stirring with air is improved, and a large amount of minute bubbles can be generated, The bubbles are broken up more and more effectively by colliding with each other actively, and the microfabrication of the bubbles is promoted.

Further, since the vortexes are continuously discharged without being vanish due to the second screw and the step, they are discharged into the aeration tank. Therefore, since the minute bubbles are actively formed, the bubbles can stay in the aeration tank for a long time and the aeration efficiency is improved.

1 is a schematic view showing a diffuser of a conventional wastewater treatment facility
2 is a schematic view showing a schematic structure of an aeration apparatus using a vortex according to an embodiment of the present invention;
3 is a perspective view showing the structure of the first screw of the present invention shown in Fig. 2
FIG. 4 is a schematic view showing a vapour apparatus using a vortex according to another embodiment of the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For a better understanding of the present invention, the description with reference to the drawings is not intended to limit the scope of the present invention. In the following description, a detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

FIG. 2 is a structural view illustrating a schematic structure of an aeration apparatus using an eddy current according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a structure of a first screw of the present invention shown in FIG.

The present invention mainly includes an aeration tank 100, a pump 200, a venturi pipe 300 and an air inflow pipe 400. The first screw 340 installed in the venturi pipe 300 is connected to a technical core .

First, the aeration tank 100 is a water tank or tank in which wastewater is stored, and the upper part may be opened. In the aeration tank 100, organic matter is decomposed by microorganisms by supplying air to wastewater and culturing microorganisms.

A pump (200) is installed on the inner bottom or outside of the aeration tank (100).

The pump 200 is connected to the aeration tank 100 to pump the wastewater in the aeration tank 100 and circulate the wastewater into the aeration tank 100.

A venturi pipe (300) or an orifice pipe is connected to the outlet side of the pump (200).

The venturi pipe 300 may have a shape in which the both ends thereof are open and may be installed on the inner bottom of the aeration tank 100. The inner diameter of the venturi pipe 300 may become narrower toward the center on one side,

Specifically, the venturi pipe 300 may have a shape in which the suction pipe 310, the stirring pipe 320, and the discharge pipe 330 are continuously connected.

The suction pipe 310 is a pipe for sucking the wastewater pumped through the pump 200. The pipe may be roughly a pipe or a channel and may have a circular cross section, but the present invention is not limited thereto.

The discharge pipe (330) is a pipe for discharging the wastewater sucked into the aeration pipe (310) into the aeration tank (100).

The stirring pipe 320 is a section for mixing the inlet air and the wastewater while connecting the suction pipe 310 and the discharge pipe 330. The stirring pipe 320 is relatively small in comparison with the inner diameter of the suction pipe 310 and the discharge pipe 330 It has an inner diameter. That is, the flow path is narrowed.

Therefore, the wastewater sucked into the suction pipe 310 passes through the stirring pipe 320, thereby increasing the flow velocity and reducing the pressure. This is a known sea according to Bernoulli principle.

Here, the portion where the suction pipe 310 and the stirring pipe 320 are connected may be in the form of a reduced tube having a tapered shape so that the inner diameter gradually decreases. The portion where the stirring pipe 320 and the discharge pipe 330 are connected may be a tapered expanded shape so that the inner diameter gradually increases.

Meanwhile, an air inlet pipe 400 is connected to the stirring pipe 320.

The lower end of the air inlet pipe 400 is connected to the stirring pipe 320 and the upper end of the air inlet pipe 400 is extended to the outside of the aeration tank 100 so that external air can be introduced.

Accordingly, since the pressure in the stirring pipe 320 is lowered, air is introduced through the air inlet pipe 400, and the introduced air is mixed with the wastewater flowing in the stirring pipe 320 and stirred.

At this time, since the pressure is suddenly lowered, cavitation phenomenon occurs, and the air contained in the wastewater is also bubbled, and the inflow air is also stirred with the wastewater and the micro bubbles are generated, so that the wastewater containing a large amount of micro bubbles And can be discharged through the discharge pipe (330).

However, in the present invention, the first screw 340 may be provided in the suction pipe 310.

The first screw 340 guides the wastewater sucked into the suction pipe 310 to form a turbulent flow, particularly a vortex, out of the laminar flow flowing in a straight line along the longitudinal direction.

That is, by inducing the wastewater to rotate while drawing a spiral, mixing with the air is made more active in the stirring pipe 320 with a large rotational energy, so that a larger amount of bubbles are generated, and the bubbles are further finely separated .

In other words, bubbles collide with each other by the vortex, causing the bubbles to break up more finely.

Specifically, the first screw 340 may be a helical blade 340a formed by winding a plate-shaped blade 340a having a predetermined width in a spiral shape. The shape of the screw is such that only the wings are continuously wound around the center line of the suction pipe 310 without the rotation shaft.

At this time, the width of the blade 340a may be approximately equal to or smaller than the radius of the inner diameter of the suction pipe 310.

The first screw 340 may be inserted into the suction pipe 310 without being engaged with the suction pipe 310. It is preferable that the edge of the blade 340a is coupled to the inner circumferential surface of the suction pipe 310, Even when inhaled, keep it in a fixed state.

In addition, the width of the blade 340a is reduced in the same proportion in the tapered section where the suction pipe and the stirring pipe 320 are connected.

In another embodiment of the present invention, a second screw 350 may be further provided in the discharge pipe 330.

The shape of the second screw 350 may be similar to that of the first screw 340.

Although the wastewater passing through the stirring pipe 320 includes fine bubbles, the bubbles can be gathered together while passing through the discharge pipe 330. In order to prevent this, the second screw 350 may be further installed to maintain a constant rotational energy.

Therefore, since the wastewater passing through the stirring pipe 320 forms a continuous vortex while passing through the second screw 350, the wastewater maintains the minute bubbles and the bubbles become finer, And can be strongly discharged into the aeration tank 100.

This is because the vortex formed through the second screw 350 generates a speed gradient in the radial direction, and shear force acts on the fluid (wastewater), thereby facilitating the miniaturization of the minute bubbles contained therein.

Preferably, a step 360 is formed at the end of the discharge pipe 330 so as to narrow the inner diameter. The step 360 serves as a nozzle or an orifice, and the minute bubbles are finely divided as the discharged wastewater bumps against the step 360, so that the size can be made smaller.

The lower end of the air inflow pipe 400 may be connected to the outer circumferential surface of the stirring pipe 320 so as to communicate therewith. However, as shown in the drawing, the air inflow pipe 400 may extend through the outer circumferential surface of the stirring pipe 320, The air may be bent in a direction in which the air is introduced.

In this case, the bent portion 410 of the air inlet pipe 400 reduces the cross-sectional area of the stirring pipe 320, so that the flow velocity can be further increased. In addition, The bubble generation rate can be improved. In addition, since the air and the fluid flow side by side, the mixing can be smooth and the flow can be smoothly performed.

For reference, the first screw 340 and the second screw 350 may be provided so that the spiral proceeds in opposite directions to each other. If the first screw 340 is formed in a clockwise direction, the second screw 350 may be formed in a counterclockwise direction.

This can increase the turbulence by promoting the direction of the vortex formed in the suction pipe 310 in the discharge pipe 330, thereby promoting the micro-bubble saturation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

100: aeration tank 200: pump
300: Venturi tube 310: Suction tube
320: stirring pipe 330: discharge pipe
340: first screw 340a: blade
350: second screw 360: step
400: air inlet pipe 410:

Claims (6)

An aeration device comprising an aeration tank in which wastewater is stored, a pump installed inside or outside the aeration tank, a venturi pipe connected to the pump, and an air inflow pipe communicating with the venturi pipe to introduce outside air,
Wherein the venturi pipe comprises a suction pipe through which pumped wastewater is sucked, a discharge pipe to be discharged, and a stirring pipe which connects the suction pipe and the discharge pipe and has a relatively small diameter and communicates with the air inflow pipe,
Wherein a first screw is provided in the suction pipe so that the wastewater sucked into the suction pipe forms a vortex. The method according to claim 1,
Wherein the first screw has a shape in which a plate-shaped blade having a width shorter than a radius of the suction pipe is continuously wound in a spiral shape with respect to a center line of the suction pipe, and an edge of the blade is coupled to an inner peripheral surface of the suction pipe Aeration device using vortex. 3. The method of claim 2,
Wherein the portion where the suction pipe and the stirring pipe are connected is tapered in which the inner diameter is reduced, and the width of the blade is also reduced by the same ratio. 4. The method according to any one of claims 1 to 3,
And a second screw is further provided in the discharge pipe so as to maintain the rotational energy of the discharged wastewater. 5. The method of claim 4,
Wherein a stepped portion having an inner diameter narrowed is formed at an end portion of the discharge pipe. 4. The method according to any one of claims 1 to 3,
Wherein the air inlet pipe has a shape that is elongated and protruded into the stirring tube and is bent so that air flows in the same direction as the flow channel.

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