KR101127077B1 - Micro Bubble Diffuser for Improvement of Dissolved Oxygen - Google Patents

Abstract

A housing having a wastewater inlet through which wastewater is introduced;

A part is inserted into the housing and accommodated therein, an air inlet is formed at one end thereof, and an air outlet is formed at the other end thereof, and an air supply pipe having a conical protrusion formed around the air outlet; And

And a cover coupled to the housing, one end of which covers the protrusion and maintains a predetermined interval with the other end, and a first air wastewater mixing chamber is formed.

The air supply pipe is movably mounted in the housing, a wastewater blocking diaphragm is formed at one end of the air supply pipe to block the inflow of waste water and is coupled to one end of the air inlet to perform a waste water line cleaning; And

The micro-bubble diffuser in communication with the air outlet is agitated air and wastewater in the primary air wastewater mixing chamber and again mixed with air and wastewater in the secondary air wastewater mixing chamber to generate a microbubble.

The present invention has the advantage that easy to maintain precision and can expect a reduction in manufacturing and assembly costs.

Dissolved Oxygen, Micro Bubble Diffuser, Wastewater Treatment System, High Concentration Organic Wastewater

Description

Micro Bubble Diffuser for Improvement of Dissolved Oxygen}

The present invention relates to a microbubble diffuser, and more particularly, in the case of biologically treating the wastewater, the microbubble can improve the wastewater treatment efficiency by accelerating and rotating the wastewater to effectively supply dissolved oxygen to the wastewater. Relates to a diffuser.

The present invention also relates to a microbubble diffuser which can separate and install the airwastewater mixing chamber to increase the airwastewater mixing efficiency and operate the microbubble diffuser in the normal mode or the cleaning mode, thereby preventing sedimentation by foreign matter contained in the wastewater. .

High concentration organic wastewaters such as food wastewater, food wastewater and livestock wastewater not only have a lot of problems in treatment efficiency and stability when applying the conventional general treatment methods, but also require high cost and a large site.

 In particular, CFSTR (continuously flow stirred tank reactor) is the same as the concentration of wastewater in the reactor, and the longer the treatment time is required as the concentration of influent wastewater increases. In addition, the plug flow reactor (PFR) gradually decreases the concentration of wastewater in the reaction tank toward the effluent, but the amount of dissolved oxygen is insufficient to reduce the activation of microorganisms.

Existing aerobic biological reactors are ineffective due to dissolved oxygen supply and mixing by an aerobic device and are limited by the rate of bubble rise. There is a problem that the oxygen transfer efficiency is very low as 5 ~ 10% due to the difficulty in generating the microbubble by generating the microbubble by the acid device, but in contact with the aeration liquid. The bubble size by this is 2 to 3 mm by the disk type diffuser, and since oxygen ionization is difficult, there is little dissolved oxygen amount.

The activated sludge method generally used in biological wastewater treatment is to decompose organic matter by various microorganisms, and it is necessary to supply oxygen as its operating conditions, and the treatment efficiency is directly related to the oxygen transfer efficiency. The higher, the higher the processing efficiency.

Looking at the prior art in more detail, the oxygen consumed by the activated sludge method is supplied by an acid device such as an air diffuser, a bubble diffuser or a microbubble diffuser, or by a mechanical aeration device such as a simplex or surface stirring method. The oxygen supply method using the diffuser uses a method of injecting air into the bubble diffuser or microbubble diffuser using a separate pump for supplying air, and thus requires a lot of power. By maintaining the size of the bubble discharged through the hole provided in the diffuser about 2 to 3 mm, there is a problem that the contact area between the bubble and the wastewater is small and the residence time for dissolving oxygen in the wastewater is insufficient.

In addition, the conventional microbubble diffuser has a low air intake rate and mixing efficiency for the waste water circulating water, it is necessary to install a plurality of microbubble diffuser, and a relatively high pressure blower is required to increase the installation cost and by various kinds of materials It is difficult to use due to clogging of the device due to the nature of the contaminated object fluid. Furthermore, when cleaning to prevent clogging, it is difficult for individual users to disassemble and remove them individually. Especially in the case of livestock wastewater, the clogging of the passage and the passage of the passage by the long hair is very severe.

An object of the present invention is to solve the above problems, in the manufacture, installation, and operation of an effective biological treatment of high concentration organic wastewater, supplying oxygen smoothly at low cost to increase dissolved oxygen efficiency and at the same time dissolution of ammonia gas, The present invention provides a microbubble diffuser for use in a wastewater treatment apparatus having a rotation and collision device for denitrification and dephosphorization.

In the microbubble diffuser according to the present invention, as the wastewater and air pass therein, acceleration is rapidly increased and a high-speed rotational force is generated to generate a vacuum pressure at the end of the air inlet pipe. Due to this vacuum pressure, a large amount of air flows through the air supply pipe, and in the primary air wastewater mixing chamber formed in a relatively small space, microbubbles are formed while stirring and colliding with the wastewater rotating at high speed. The finer microbubbles are made by further mixing in the air wastewater mixing chamber.

In addition, the present invention can be made to remove the foreign matter by the cleaning mode in the waste water line when the normal operation is not made by accumulating or clogged foreign matter in the wastewater treatment line after a certain time operation.

In order to achieve the above object, the present invention provides a waste water inlet for the waste water inlet is formed; A part is inserted into the housing and accommodated, an air inlet is formed at one end, and an air outlet is formed at the other end, and an air supply pipe having a conical protrusion formed around the air outlet; And a cover coupled to the housing to surround the protrusion, and having a first air wastewater mixing chamber provided at a predetermined interval inside the other end, and a second air wastewater mixing chamber in which air and wastewater are mixed again. A plurality of partitions are formed on the outside of the protrusion to provide a passage through which the wastewater introduced through the wastewater inlet flows into the air wastewater mixing chamber.

A primary air wastewater mixing chamber having a predetermined space at the end of the cover to form a predetermined space inside the cover with the protrusion and the air outlet;

By maintaining the rotational force and acceleration of the strong wastewater generated in the protrusion in the primary air wastewater mixing chamber to generate a high vacuum pressure at the air outlet, the microbubble is generated by agitating air and wastewater by the continuous rotational force and acceleration of the wastewater Provide a bubble diffuser.

In addition, the air supply pipe is mounted to be movable in the housing, the cleaning device body to form an appearance; A cleaning device cover coupled to the cleaning device body to form a chamber, and having a communication tube through which waste water or fluid is supplied to the chamber; A driving bar mounted through the cleaning device body and operated by a diaphragm operated by pressure of waste water or fluid; It is possible to further include a cleaning device for linearly reciprocating the air supply pipe by the drive bar.

In addition, when the fluid or waste water is maintained in a predetermined amount or more in the chamber, the pressure of the fluid or waste water may be operated in the normal mode of moving the air supply pipe to the cover by moving the driving bar of the diaphragm.

In the normal mode, the wastewater may be introduced into the wastewater inlet, and the air may be introduced into the air inlet so that the wastewater and the air may be mixed in the air wastewater mixing chamber.

When the fluid or wastewater in the chamber is lowered below a certain pressure, the chamber may be operated in a cleaning mode for moving the air supply pipe to the opposite side of the cover.

The present invention has the advantage that it is easy to maintain the precision during mass production and can expect a reduction in manufacturing and assembly costs. In addition, the bubbles supplied to the biological reactor using microorganisms dissolve the gas as the liquid and gas rotate and collide in the orifice part and the gas-liquid amplification diffusion means and the waste water and the external air, which are gas-liquid mixtures, without additional energy supply. Maximizing the oxygen transfer efficiency by contacting the aeration liquid in the reactor to form a.

Conventionally, the air wastewater mixing chamber is installed at the end of the cover in communication with the air outlet, but unlike air, the water has a very high density, and the rotational force and acceleration of the strong wastewater generated from the protrusions are sharply lowered, thereby effectively stirring the air and the wastewater. And the vacuum pressure generated at the air outlet drops drastically. In order to solve this problem, the present invention maintains a constant interval at the end of the cover to form a predetermined space inside the cover having the protrusion and the air outlet port provided with a primary air waste water mixing chamber and the strong wastewater generated from the protrusion By maintaining the rotational force and acceleration of the primary air wastewater mixing chamber, it generates a high vacuum pressure at the air outlet and provides a microbubble diffuser that generates microbubbles by agitating air and wastewater by the rotational force and acceleration of the continuous wastewater.

In addition, it is possible to effectively increase the dissolved oxygen transfer rate without a large external power supply due to the rotational, collision effect to rise by the density difference with the waste water.

The present invention facilitates the cleaning of the waste water acceleration and the rotational force generating passage by providing a cleaning device for cleaning the microbubble diffuser after a certain period of normal operation.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

1 is a cross-sectional view of a micro bubble diffuser according to the present invention. A description with reference to FIG. 1 is as follows.

The microbubble diffuser according to the present invention includes a housing 10 having a wastewater inlet 12 through which wastewater is introduced, an air supply pipe 20 into which a part of the housing 10 is inserted and accommodated, and one end of the air supply pipe 20. The cover 40 of the primary air wastewater mixing chamber 60 formed in the housing.

The housing 10 is generally formed in a hollow cylindrical shape, the waste water inlet 12 may be formed on one side thereof. In the housing 10, a wastewater chamber 14 through which wastewater introduced through the wastewater inlet 12 may pass may be formed.

The air supply pipe 20 has an air inlet 22 through which air is introduced at one end, and an air outlet 24 is formed at the other end thereof, and a conical protrusion 30 is formed around the air outlet 24. The air inlet 22 and the air outlet 24 are in communication with each other in the air supply pipe (20).

A step 34 is formed in the air supply pipe 20, and the diaphragm 16 mounted on the housing 10 may be fixed to the step 34. At this time, the air supply pipe 20 is preferably mounted to the housing 10 to be movable. Since the diaphragm 16 is easily deformed and has a property to return to its original shape after being deformed, the diaphragm 16 may guide the movement of the air supply pipe 20.

The cover 40 is integrally coupled to the housing 10, one end of the cover 40 has a wastewater inlet 52 having a relatively large cross-sectional area, and the other end of the cover 40 has a relatively small cross-sectional area. The protrusion 30 and the primary air wastewater mixing chamber 60 are formed, and the other end is provided with a secondary air wastewater mixing chamber 61.

Where the cover 40 covering the primary air wastewater mixing chamber 60 is in contact with the protrusion 30 has a relatively narrow cross-sectional area, similar to the outer formation of the protrusion 30, the secondary air The wastewater mixing chamber 61 preferably has a relatively large cross-sectional area to form a space in which air and wastewater can be mixed.

On the other hand, a plurality of partitions 32 are formed on the outside of the protruding portion 30 and the passage 50 through which the wastewater introduced through the wastewater inlet 12 is moved to the air wastewater mixing chamber is provided. In particular, as the passage 50 approaches the air wastewater mixing chamber 60, the cross-sectional area decreases, and the wastewater accelerates while passing through the passage 50. This is because the velocity of the fluid is increased by Bernoulli's theorem when the cross-sectional area of the passage through which the fluid flows is reduced even at the same flow rate.

That is, the passage 50 has a smaller cross-sectional area toward the outlet 54 than the inlet 52, so that the flow rate of the wastewater may be changed.

2 is a cross-sectional view of the cover and the air supply pipe is coupled. A description with reference to FIG. 2 is as follows.

A passage 50 is formed by the cover 40 and the protrusion 30, and the passage 50 is divided into a plurality of partitions 32 by the plurality of partitions 32. That is, the wastewater introduced into the wastewater chamber 14 may be divided into a plurality of flow paths and moved to the primary air wastewater mixing chamber 60.

The protrusion 30 and the air outlet 24 maintain the acceleration and rotational force of the waste water and form a vacuum pressure in the air outlet 24 to improve the air waste water mixing efficiency and the other end of the cover 40 at a predetermined interval. It is formed while maintaining.

Figure 3a is a perspective view of the housing and the air supply pipe coupled state 3b is a rear view of the projection, Figure 3c is a side view of the air supply pipe. A description with reference to FIGS. 3A, 3B, and 3C is as follows.

The partition wall 32 is inclined at an angle of 5 ° to 75 ° with respect to the vertical plane and at an angle of 2 ° to 45 ° with respect to the horizontal plane, so that the passage 50 gradually decreases in cross-section along the partition wall 32. The speed of the flowing wastewater is increased and rotational force is generated.

4 is a cross-sectional view of the primary air mixing chamber. A description with reference to FIG. 4 is as follows.

The air outlet 24 formed integrally with the air supply pipe 20 and the protrusion 30 which is a waste water passage through which the air is discharged and the waste water are discharged are formed inside the cover 40, respectively. L42 is to be changed by the angle (Fig. 3b, 3c) with respect to the horizontal plane and the vertical plane of the protrusion (30). It is preferable to maintain the length of 0.5-3 times the diameter of the protrusion end (d52).

Hereinafter, the operation of the micro bubble diffuser will be described.

Waste water pumped by a pump (not shown) flows into the wastewater chamber 14 at a constant pressure state through the wastewater inlet 12. Wastewater collected in the wastewater chamber 14 flows into the inlet 52, passes through the passage 50, and is discharged to the outlet 54.

Wastewater passing through the passage 50 flows along a plurality of flow paths divided by the partition wall 32, and an acceleration force and a rotation force are generated according to a form inclined in the vertical direction or the horizontal direction of the partition wall 32. .

In particular, since the wastewater passing through the partition 32 moves at a high speed at the outlet 54 adjacent to the air outlet 24, the air pressure is lowered near the air outlet 24. In particular, since the acceleration rapidly increases while the wastewater passes through the passage 50 and a high-speed rotational force is generated, a vacuum pressure may be generated in the air outlet 24. On the other hand, the air inlet 22 is a constant pressure bar air is moved from the air inlet 22 to the air outlet (24).

That is, air is introduced into the air inlet 22 and discharged to the air outlet 24.

Air and wastewater are mixed in the primary air wastewater mixing chamber 60, and microbubbles are formed while stirring and colliding with wastewater and air, which maintain rotational and accelerating forces on a narrow passage of the lid 40, and then cover the lid ( In the secondary air wastewater mixing chamber 61 located at the end of the 40) by impingement agitation, even finer microbubbles are formed.

5 is a view showing a state in which the cleaning device is coupled to operate in the normal mode. A description with reference to FIG. 5 is as follows.

The microbubble diffuser according to the present invention may further include a cleaning device having a cleaning device body 70 forming an appearance and a cleaning device cover 72 coupled to the cleaning device body 70.

The cleaning device is mounted on one side of the housing 10, preferably mounted in a straight line on the air supply pipe (20). In particular, the cleaning device may be fixed to the housing 10 by a cleaning device fixing means 94 including a bolt coupling and the like.

The cleaning device cover 72 has a chamber 92 including a predetermined space therein, the communication tube 76 to which waste water or fluid is supplied to the chamber 92 and the discharge tube 73 for discharging fluid. Each is formed. The fluid may comprise wastewater and is irrelevant as long as it can be pressurized when collected in a certain amount. The communication tube 76 may include an electronic or manual valve 74 that controls the fluid flowing into the chamber 76.

The cleaning device includes a driving bar 80 mounted to penetrate the cleaning device body 70 and operated by the diaphragm 78, and a diaphragm 78 supporting and pressing the driving bar 80.

The diaphragm 78 applies the force to the driving bar 80 to move the air supply pipe 20.

Hereinafter, a process of operating in the normal mode will be described with reference to FIG. 5.

When the microbubble diffuser is operated in the normal mode, the diaphragm 78 is driven because the valve 74 is opened to generate pressure in the chamber 92 when a predetermined amount of waste water is supplied to the chamber 92. Force is applied to the bar 80 so that the air supply pipe 20 is moved toward the cover 40. That is, the partition 32 and the inner surface of the cover 40 is in contact with each other, the passage 50 is formed so that the waste water can be moved along the passage (50).

Therefore, acceleration and rotational force are generated in the wastewater, and a vacuum is formed at the air outlet, so that the air is mixed with the inflow wastewater and microbubbles are generated. Since the specific operation method is the same as the content described with reference to FIG. 1, it will be omitted.

6 is a view showing a state in which the cleaning device is coupled to operate in the cleaning mode. A description with reference to FIG. 6 is as follows.

Microbubble diffusers are used in adverse conditions to deal with wastewater contaminated by a variety of different materials. Therefore, it is desirable to periodically clean all wastewater lines with the clogging phenomenon of the microbubble diffuser of the present invention.

When the microbubble diffuser is used for a long time, since a large amount of foreign matter is contained in the wastewater, foreign matter accumulates in the passage 50 or the wastewater inlet 12, and thus the wastewater flow is not desired. In this case, if there is no cleaning mode, the user needs to disassemble the micro bubble diffuser and clean each part. On the other hand, in the present invention, the microbubble diffuser can be cleaned by driving using a machine rather than a human force.

First, the valve 74 is closed and the waste water or the fluid in the chamber 92 is discharged to the outside through the discharge pipe 73. The flow rate discharged through the discharge pipe 73 is less than the amount flowing from the valve 74 so that the pressure in the chamber 92 is maintained above a certain pressure when the valve is opened, but when the valve 74 is closed, the chamber 92 The pressure in) drops below a certain pressure.

While the pressure in the chamber 92 of the cleaning device is lowered below a predetermined pressure, the wastewater pressure of the wastewater chamber 14 is not changed, so that the wastewater pressure having a constant pressure is provided on one side of the air supply pipe 20. The air supply pipe 20 moves in the direction of the cleaning device so that the air supply pipe 20 moves toward the cleaning device body so that the partition wall 32 and the cover 40 are spaced apart from each other, and the cross-sectional area of the passage 50 increases. This is because an additional space is formed between the partition 32 and the cover 40.

Therefore, the overall flow rate of the wastewater line is increased and the foreign matter mainly existing between the partition wall 32 and the cover 40 having the smallest cross-sectional area is removed by a space to secure additionally.

An experimental example is demonstrated using the table below.

-Wastewater Type: Swine Livestock

-Processing amount: 30㎥ / day

Wastewater concentration: ph 8.9, BOD 7,000 mg / l, T / N 4,000 mg / l.

Design Factor Comparison division Aerobic Biological Reactor of the Invention General Aerobic Biological Aeration Tank Remarks Oxygen Transfer Efficiency (%) 30-40 5-10 BOD volume load
(kg / BOD / ㎥.d) 20-30 0.3-0.9 Reactor volume reduction MLSS concentration (mg / l) 5000-8000 2500-3500 TKN volume load (mg / ㎥.d) 0.8-1.6 0.2-0.4 Air supply Microbubble Diffuser air blower Reduced power costs Air supply method Natural air intake by microbubble diffuser Disk type diffuser Processing efficiency (%) BOD: 95% or more, nitrification: 98% or more High concentrations of organics and nitrogen are not possible

Design calculation comparison division Aerobic Biological Reactor of the Invention General Aerobic Biological Aeration Tank Volume (㎥) Organic matter removal 10 350 Total Nitrogen Removal 80 310 Air volume (㎥ / min) Organic matter removal 1.5 13 Total Nitrogen Removal 5 30 Blower capacity (㎥ / min) Organic matter removal 1.8 15.6 Total Nitrogen Removal 6 36 Wind pressure (kg / ㎠) 0.3 0.5 Diffuser Organic matter removal 4 65 Total Nitrogen Removal 14 65 Circulation pump capacity (㎥ / min) Organic matter removal 1.2 Total Nitrogen Removal 4.2 *. Total nitrogen removal is applied to the aeration tank and reactor volume on the denitrification activated sludge method.

Treatment efficiency comparison division Aerobic Biological Reactor of the Invention General Aerobic Biological Aeration Tank PH 5-6 8.8-9.5 Dissolved Oxygen Concentration (mg / ℓ) 5-6 0-1 BOD (mg / ℓ) 100 or less Normal treatment due to lack of dissolved oxygen T / N (mg / ℓ) Organic nitrogen 1100 NH3-N 100 1500 NO2-N
NO3-N 1500 Lack of dissolved oxygen prevents NH3 from oxidizing to NO2 and NO3 *. Total nitrogen removal is the result of applying the denitrification activated sludge method

As can be seen in the experimental example, when using the microbubble diffuser of the present invention, a higher wastewater treatment efficiency was obtained even when using a facility having a smaller capacity than a general aerobic biological aeration tank.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

1 is a cross-sectional view of a micro bubble diffuser according to the present invention.

2 is a cross-sectional view showing an air wastewater mixing chamber.

Figure 3a is a perspective view of the housing and the air supply pipe coupled state.

Figure 3b is a rear view of the air supply pipe.

3c is a side view of the air supply pipe

4 is a cross-sectional view of the primary air wastewater mixing chamber

5 is a view showing a state in which the cleaning device is coupled to operate in the normal mode.

Figure 6 is a view showing a state in which the cleaning device is coupled to operate in the cleaning mode.

<Description of Signs for Main Parts of Drawings>

10: housing 20: air supply pipe

40: cover 70: cleaning device body

72: cleaning device cover 80: drive bar

Claims (7)

A housing having a wastewater inlet through which wastewater is introduced; A part is inserted into the housing and accommodated therein, an air inlet is formed at one end thereof, and an air outlet is formed at the other end thereof, and an air supply pipe having a conical protrusion formed around the air outlet; The first air wastewater mixing chamber and the first air wastewater mixing chamber having a larger cross-sectional area than the first air wastewater mixing chamber are coupled to the housing to one end to surround the protrusion, and to maintain a predetermined gap between the other end and the air outlet. A cover formed with a secondary air wastewater mixing chamber along a fluid flow direction; A plurality of partitions are formed on the outside of the protrusion to allow the wastewater introduced through the wastewater inlet to flow into the primary air wastewater mixing chamber; The air supply pipe is movably mounted in the housing, a wastewater blocking diaphragm is formed at one end of the air supply pipe to block the inflow of waste water and is coupled to one end of the air inlet for cleaning the waste water line; Including, Waste water exiting from the passage and the air sucked from the air outlet in the primary air wastewater mixing chamber communicating with the air outlet are agitated, and then air and wastewater are mixed in the secondary air wastewater mixing chamber to generate microbubbles. Micro Bubble Diffuser. The method of claim 1, As the passage is closer to the secondary air wastewater mixing chamber, the cross-sectional area becomes smaller, and the rotational and acceleration forces are generated as the wastewater passes through the passage, and air and wastewater are mixed in the primary air wastewater mixing chamber formed inside the cover. And a microbubble diffuser characterized in that the wastewater and air are mixed again in the secondary air mixing chamber formed at the other end of the passage. The method of claim 1, The convex protrusion end of the air supply pipe is located inward from the end of the cover by a length corresponding to 0.5-3 times the diameter of the protrusion microbubbles characterized in that the primary air wastewater mixing space is formed inside the cover Diffuser The method of claim 1, The air supply pipe is movably mounted in the housing, A cleaning device body forming an appearance; A cleaning device cover coupled to the cleaning device body to form a chamber, and having a communication tube through which waste water or fluid is supplied to the chamber; A driving bar mounted to penetrate the cleaning device body and operated by hydraulic pressure; And A microbubble diffuser further comprising a cleaning device mounted to the drive bar and having a diaphragm for linearly reciprocating the air supply pipe. 5. The method of claim 4, When the fluid or waste water is supplied to the chamber above a certain pressure, the diaphragm is compressed, The micro bubble diffuser is characterized in that the drive bar is operated in a normal mode for moving the air supply pipe toward the cover The method of claim 5, In the normal mode, the wastewater flows into the wastewater inlet, and the air flows into the air inlet so that the wastewater and the air are mixed in the air wastewater mixing chamber. 5. The method of claim 4, When the pressure of the chamber is below a certain pressure, the diaphragm is tensioned, And the drive bar is operated in a cleaning mode to move the air supply pipe to the opposite side of the cover.

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