KR100547199B1 - Process and plant for the solubility of gas and sludge mixing - Google Patents

Abstract

Disclosed is a wastewater treatment apparatus. Such a wastewater treatment device is composed of an aeration tank and an air dispersing device, the air dispersing device having one side disposed outside the aeration tank, and the other side being disposed inside the aeration tank for introducing air or wastewater into the aeration tank; Mounted on a pedestal fixed inside the other side of the supply pipe is rotatably mounted on the top of the support projecting out of the supply pipe, by generating a microbubble by rotating by buoyancy of the air injected from the supply pipe, Agitation means for purifying the waste water by increasing the dissolved oxygen rate by the sludge and the stirring action, and an air derivative for intensively injecting the air supplied to the supply pipe to the stirring means.

Wastewater, Agitation Means, Biological Treatment, Rotation, Dissolved Oxygen

Description

Wastewater treatment system using dissolution and mixing of gas {Process and plant for the solubility of gas and sludge mixing}

1 is a structural diagram showing the side of the wastewater treatment apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a bottom perspective view showing the stirring means of the wastewater treatment apparatus shown in FIG. 1; FIG.

3 is a bottom view of the stirring means shown in FIG.

FIG. 4 is a sectional view taken along the line "A-A" in FIG.

FIG. 5 is a schematic diagram showing the motion state of bubbles moving along the stirring means shown in FIG. 2; FIG.

The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus capable of improving wastewater treatment efficiency by effectively supplying and stirring oxygen to wastewater when biologically treating wastewater.

In general, water treatment is a process of converting contaminated substances in water into substances stabilized by microorganisms or chemical oxidation and reduction reactions.

Therefore, the water treatment technology is a technique for stabilizing the characteristics of the wastewater, organic matter and nutrients in various ways. Currently, water treatment techniques are mostly biological treatment methods and relatively inexpensive treatment costs.

However, this biological water treatment method is very slow and unstable because it depends on the organic decomposition rate of microorganisms in the natural state.

Thus, the key to biological wastewater treatment is to supply organic matter more freely as a source of free or combined oxygen as a source of energy, and to maintain the proper conditions of microorganisms, and to contact between microorganisms and organic or nutrients. This is to stir efficiently so that it can be made smoothly.

In the biological treatment method of such wastewater, generally, low concentration wastewater is subjected to aerobic treatment, and high concentration wastewater is anaerobic treatment.

The anaerobic treatment of high concentration wastewater is because it is difficult to maintain the proper dissolved oxygen required for aerobic.

Of course, there are methods such as the pure oxygen aeration method, pressure dissolved oxygen method, etc., but practical application is difficult due to the pure oxygen supply cost, the sludge closure phenomenon due to the pressurization.

Therefore, as described above, the conventional wastewater treatment apparatus is difficult to increase the dissolved oxygen efficiency of dissolving oxygen in the wastewater, and there is a problem in that the cost increases even when the dissolved oxygen efficiency is increased.

In addition, the conventional wastewater treatment apparatus is provided with a separate aeration device for maintaining dissolved oxygen and a stirring device for stirring, and has a problem of low efficiency.

Some devices have been developed to solve these problems, but the manufacturing process is difficult, excessively expensive, and difficult to install.

Accordingly, an object of the present invention, in order to solve the above-mentioned problems, in order to effectively treat the high concentration of wastewater biologically, supply oxygen smoothly at low cost in manufacturing, installation and operation costs to increase the dissolved oxygen efficiency, and at the same time a gas such as ammonia, carbon dioxide The present invention provides a wastewater treatment apparatus having a stirring device for dissolving and denitrifying materials.

In order to achieve the above object, the present invention provides a waste water treatment device consisting of an aeration tank and an air dispersing device, one side of which is disposed outside the aeration tank, the other side is disposed inside the aeration tank, the aeration tank A supply pipe for introducing air or wastewater into the interior of the pipe; Mounted on a pedestal fixed inside the other side of the supply pipe is rotatably mounted on the top of the support projecting out of the supply pipe, by generating a microbubble by rotating by buoyancy of the air injected from the supply pipe, Stirring means for purifying the waste water by increasing the dissolved oxygen rate by the sludge and the stirring action; And an air derivative mounted to the supply pipe to intensively inject air supplied to the stirring means.

According to a preferred embodiment of the present invention, the air diffuser is composed of an air inlet, a funnel-type air inductor, a cone-shaped rotary inductor corresponding to the funnel shape, and a stirring means.

In the fluid form around the diffuser, only air is present in the piping portion, and air and wastewater are mixed from the air conductor portion.

In addition, the flow path is composed of an inlet in which the bubble rises from the bottom and the outlet through which the bubble passes through the inlet rises to the top, and a gap between the end of the rotating derivative and the air conductor is 2 cm or less. Force of air buoyancy is used to rotate the stirring means.

The rotational inductor is attached to the conical shape by inclining the left and right at a predetermined angle to at least one or more so that the stirring means can be easily moved by the buoyancy force of the air, and the air introduced through the air inlet pipe rises to a predetermined value. The large bubbles are dispersed into a plurality of fine bubbles by rotating the disc with the force of.

In addition, the air inlet pipe is equipped with a support for the static flow of the stirring means and the separation of the bubbles to be discharged, it is possible to more efficiently distribute and move the air.

Through this process, the kinetic energy is transmitted to the stirring means, and the stirring means starts the rotary motion.

The stirring means includes a stirring effect by air injection and a method of continuously circulating waste water to stir.

Hereinafter, with reference to the accompanying drawings will be described in detail the wastewater treatment apparatus according to the present invention.

1 is a structural view showing a side of a wastewater treatment apparatus according to a preferred embodiment of the present invention, Figure 2 is a perspective view showing the stirring means of the wastewater treatment apparatus shown in Figure 1, Figure 3 is the stirring shown in Figure 2 Bottom view of the means.

As shown, the wastewater treatment apparatus proposed by the present invention is made by mounting an acid generator 3 for purifying the wastewater by oxygen supply and agitation inside an aeration tank 1 in which the wastewater is stored.

The air diffuser 3 includes a supply pipe 5 for introducing air or wastewater into the aeration tank 1, and an air derivative 7 for injecting the air supplied to the supply pipe 5 upward in a conical shape. And a stirring means 9 for purifying by rotating by buoyancy of the air injected by the air derivative 7 to generate fine bubbles to improve the dissolved oxygen rate in the waste water, and the stirring means 9 It includes a rotating derivative 11 which makes the stirring means 9 have a rotational force by contacting with the raised air attached to the surface.

In the diffuser device 3 having such a structure, the supply pipe 5 is one side 13 is located outside the aeration tank 1 to supply air or waste water into the aeration tank 1, and the other side 15. ) Is located in the aeration tank (1) to inject air or waste water introduced into the aeration tank (1).

On the other side 15 of the supply pipe 5, the stirring means 9 and the rotating derivative 11 of the air diffuser 3 are integrally mounted.

In more detail, the stirring means 9 is a conical plate and is attached to the support 17 by a bearing 23. Therefore, when an external force acts on the stirring means 9, the stirring means 9 may rotate about the support 17.

The support 17 is fixed inside the other side 15 of the supply pipe 5. That is, as shown in Figure 4, the inside of the supply pipe 15, the cross-shaped pedestal 19 is fixed by screwing to the screw thread 16 formed on the inner wall surface. In this case, since the pedestal 19 has a cross shape, air or waste water supplied from the supply pipe 5 may be smoothly supplied.

Accordingly, the lower end of the support 17 is fixed integrally to the pedestal 19 so that the support 17 is fixed to the supply pipe 5.

In addition, the cover 21 is mounted on the upper end of the support 17 to seal the bearing 23.

Again, referring to FIGS. 1 to 3, the rotating derivative 11 protrudes from the outer circumferential surface of the stirring means 9 fixed by the support 17 in this way.

That is, the rotating derivative 11 is formed of a plurality of wings 12 protruding at a predetermined height h on the outer circumferential surface of the stirring means 9, each bent in a spiral.

Such a plurality of wings 12 is formed in the rim direction at the center of the stirring means (9) has a shape that the width (W) is gradually widened. Therefore, when the air introduced through the supply pipe 5 is supplied between the plurality of blades 12, the moving length of the bubble-shaped air increases, and the bubble is also due to the buoyancy force rising vertically ( By contacting 12) by pushing the wing 12 by the rotational force to rotate the stirring means (9).

On the other hand, the supply pipe (5) is equipped with an air derivative (7), thereby preventing the air injected through the supply pipe (5) to be injected in the other direction of the aeration tank (1) and guided in the direction of the stirring means (9) By increasing the rotational speed of the stirring means (9) it is possible to activate the stirring action to improve the purification efficiency.

The distance between the air conductor 7 and the rotating derivative 11 depends on the length of the support 17. This may affect the rotation of the air derivative 7.

The air derivative 7 is a plate having a conical shape, and is disposed away from the stirring means 9 by a predetermined distance to form a flow path 29 between the air derivative 7 and the stirring means 9.

Air injected from the other side 15 of the supply pipe 5 rises through this flow path 29 by buoyancy, and rotates the stirring means 9 by contacting the rotary derivative 11 during the rise.

Accordingly, by the rotation of the stirring means 9, the air in the form of fine bubbles and the sludge in the waste water are agitated with each other to improve the purification efficiency of the waste water.

5 schematically shows a state of bubbles rising along the stirring means 9 during such stirring. That is, the bubble (B) moved to the lower portion of the stirring means (9) is affected by the water pressure only in a certain direction and the passage is formed in the continuous bubble movement so that the positive pressure is converted to dynamic pressure to receive the water pressure in the opposite direction to move the bubble This relatively decreases the bubble movement speed is very fast.

In addition, the bubble A completely passed through the stirring means 9 loses its balance due to the change in the moving speed and the direction due to the changed hydraulic pressure and fluid flow by the stirring means 9, and thus, the fine bubbles or the irregular shape easily. The phenomenon of changing into bubbles appears.

Therefore, the purification efficiency of waste water can be improved by stirring waste water and air more efficiently.

Separately from the above embodiment, when the pump is connected to the supply pipe 5 to circulate the waste water, the aeration tank 1 can be stirred very effectively without a separate stirring device.

In some cases, a separate pipe may be installed, and the same apparatus as the air diffuser 3 may be installed and used for a single purpose stirring without giving up.

Hereinafter, with reference to the accompanying drawings will be described in more detail the operation of the wastewater treatment apparatus according to a preferred embodiment of the present invention.

1 to 5, when the waste water treatment apparatus is operated, the waste water is stored in the aeration tank 1 by supplying the waste water into the aeration tank 1 through the supply pipe 5.

After the waste water is stored, air is injected through one side 13 of the supply pipe 5. The injected air is supplied through the supply pipe 5 and is injected into the waste water through the other side 15 of the supply pipe 5.

The injected air is guided by the conical air derivative 7 and concentrated to the rotating derivative 11.

The air supplied to the rotary derivative 11 pressurizes the rotary derivative 11 by buoyancy, and this pressing force is transmitted to the stirring means 9. At this time, the stirring means 9 is rotatable to the support 17 by the bearing (23).

Therefore, the pressing means 9 is rotated around the support 17 by the pressing force is transmitted to the rotating derivative 11, a large amount of micro-bubbles are generated by this stirring action.

At this time, the micro-bubbles are moved between the plurality of wings 12 constituting the rotating derivative 11, so the movement time is sufficiently delayed to increase the amount of dissolved oxygen in the waste water.

As a result, the sludge in the waste water can be efficiently purified by stirring with such microbubbles for a sufficient time.

In the present air diffuser (3), mass transfer and agitation occur simultaneously through fluid flows that change in various forms inside the aeration tank 1 by the basic mechanism of the above-mentioned bubbles.

For reference, as a result of the experiment through the tap water using the wastewater treatment apparatus according to the present invention, the following results are obtained.

division The present invention General diffuser Dissolved oxygen (O2Kg / kwh) 2.7-8.0 1.1-2.0

* Experimental data (Experimental conditions: water temperature 20 ℃, used water volume 1.5㎥, inflow air volume 300ℓ / min)

The experimental conditions were used for tap water, using the same temperature, capacity, power. In addition, Na₂SO₃ is used to remove DO in the process of observing the increase of DO with the aeration time at the dissolved oxygen of 0.2 mg / L. In addition, a disk type diffuser which is generally used for efficiency comparison is used.

As can be seen from the above experimental results, when the air is dissolved in the wastewater using the wastewater treatment apparatus according to the present invention, it can be seen that there is a superior effect in terms of dissolved oxygen efficiency compared to the general acidifier.

As described above, the wastewater treatment apparatus according to the present invention has the following advantages.

First, since the air is introduced through the open air inlet tube with little ventilation resistance, air injection is possible at the minimum pressure that can overcome the head head difference.

Second, since the bubble supplied to the reactor rises due to the density difference with the waste water without additional energy supply and rotates the stirring means, it is possible to effectively induce dissolved oxygen transfer rate and stirring effect without external power supply.

Third, the device is small, the installation of the facility can be completed by screwing to the air supply pipe is very easy to install.

Fourth, the stirring means is very simple to manufacture castings.

Fifth, since the air is supplied using the air inlet pipe of a simple structure, there is an advantage of preventing the air inlet pipe is blocked.

Sixth, the diffuser device can be operated by connecting the circulation pump to the air inlet pipe to induce effective stirring.

Seventh, it can be used for agitation not by abandonment but by circulation of water.

The present invention can be variously modified by those skilled in the art without departing from the gist of the invention as claimed in the claims, and is not limited to the specific preferred embodiments described above. .

Claims (5)

In the wastewater treatment apparatus including an aeration tank and an acid generator, The air dispersing device may include a supply pipe having one side disposed outside the aeration tank and the other side disposed inside the aeration tank for introducing air or wastewater into the aeration tank; Mounted on a pedestal fixed inside the other side of the supply pipe is rotatably mounted on the top of the support projecting out of the supply pipe, by generating a microbubble by rotating by buoyancy of the air injected from the supply pipe, Stirring means for purifying the waste water by increasing the dissolved oxygen rate by the sludge and the stirring action; And Wastewater treatment apparatus including an air derivative mounted to the supply pipe for injecting concentrated air to the stirring means. The wastewater treatment apparatus of claim 1, wherein the stirring means is rotatably mounted by a bearing on an upper portion of the support. The wastewater treatment apparatus according to claim 1, wherein the stirring means has a conical shape, and the surface of the stirring means has a rotating derivative attached to the rising air to convert the buoyancy force into a rotating force, thereby improving the rotational efficiency of the stirring means. . The wastewater treatment apparatus according to claim 3, wherein the rotating derivative includes a plurality of wings formed spirally on the surface of the stirring means. The wastewater treatment apparatus according to claim 1, wherein the air derivative is attached to the other edge of the supply pipe in a conical shape to guide air injected through the other side of the supply pipe toward the stirring means.

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