KR200199585Y1 - A microbuble generator - Google Patents

Abstract

The wastewater treatment system using the microbubble generating device according to the present invention extends the maintenance of bubbles and lasts for a long time, thus maximizing the wastewater treatment efficiency and minimizing the installation area of the wastewater, thereby reducing the investment and maintenance cost of the wastewater treatment plant at a low cost. Prevent environmental pollution

Description

Wastewater treatment system using microbubble generator {a microbuble generator}

The present invention relates to a wastewater treatment system using a microbubble generating device, and more specifically, when a solution mixed with a surfactant in wastewater or industrial water is introduced through an ejector, air is introduced into the ejector, and microbubbles in the mixed liquid are introduced. At this time, the volume of water and bubbles is about 8: 2, and the solution can be supplied by separating water and bubbles at a ratio of 1: 1 (volume ratio) by using the gas-liquid separator in the microbubble generator. The present invention relates to a wastewater treatment system that uses less circulating water, has a smaller tank capacity, less power costs, and contaminants injured in the injured ancestors. .

Dissolved Air Flotation, which is widely used in conventional wastewater treatment plants, has a limitation in injecting air into water. In the existing treatment method, the dissolved air flotation method, as shown in FIG. 5, injects air into the circulating water by using an ejector or an air compressor, and a high pressure of about 4 to 5 atmospheres to insert more air into the circulating water. Due to the limitations of air solubility, high concentrations of light pollutants in the waste water (hereinafter referred to as 'SS concentration') are required to increase buoyancy, so a large amount of air is required and therefore a large amount of circulating water (generally By using the waste water flow rate (about 30 ~ 100%), the diameter of the floating tank 3 increases, the installation area installation cost increases, and the bubbles dissolved in the circulation procedure flow into the floating tank from the pressure tank 4. The waste water and the circulating water are mixed, and the circulating water, which was 4 to 5 atm, is exposed to atmospheric pressure, and the bubbles dissolved in the circulating water become gas, rising from the flotation tank. There was a problem that the bubble size is increased and the bubble is enlarged, the surface tension is weakened and burst to reduce the floating efficiency of the SS, the re-precipitation of the wound SS also occurs. As such, the method using the air compressor can increase the pressure of the pressurized tank as the SS concentration in the waste water is high, so that a large amount of air can be introduced (generally operated at 4 to 5 kg / cm²) and the air volume is insufficient even at this pressure. In order to increase the amount of air, 30 ~ 200% of circulating water should be used to increase the volume of air. Therefore, the capacity of floating tanks, pressurized tanks, and pressurized pumps will increase, which will take up a lot of investment cost, operation cost, and installation area.

In addition, the dissolved air flotation method using the ejector has a problem in that a larger amount of circulating water is used than the air compressor because the amount of air intake is determined according to the pressure of the pressurized pump, unlike the above method. .

An object of the present invention is to solve such a problem, by separating the high water content circulating water and mixing the separated bubbles with the aggregated wastewater supplied from the flocculation tank to supply the flotation tank to facilitate the treatment of contaminants. As a result, the floating tank, pump, and installation area are reduced, so it is possible to provide a wastewater treatment system using a microbubble generating device that can reduce the investment cost, operation cost, and installation area, and can process more wastewater at the same time. .

Another object of the present invention is to remove the remaining solution except the bubbles in the circulating water as much as possible, so that only the fine-bubble liquid mixed with a high purity solution and the volume ratio of almost 1: 1 can be introduced into the flotation tank, the amount of circulating water used It is to provide a wastewater treatment system using a micro-bubble generating device that can significantly reduce the amount.

This object of the present invention is connected to the surfactant mixture and the circulating water and the circulating water outflow conduit flowing out of the surfactant mixture and the separate air inlet pipe is connected to the air inflow of the circulating water It is connected to the ejector and the ejector, the bubble discharged from the ejector and the tank filled with circulating water, and the mixed gas conduit through which the bubble and the circulating water is discharged from the tank and the upper gas port outlet portion so as to separate the bubble and the circulating water; The bubble outflow pipe of the microbubble generating device composed of a gas-liquid separator having a lower circulating water discharge part is connected to a wastewater outflow conduit through which the wastewater agglomerated in the coagulation tank flows, so that high-purity microbubble liquid is introduced into the flotation tank. Achieved by a wastewater treatment system.

Wastewater treatment system using a micro-bubble generating device according to the present invention will be clearly understood its features and advantages by the embodiments described below with reference to the accompanying drawings.

1 is a schematic application diagram of a wastewater treatment system using a microbubble generating device

2 is a schematic configuration diagram of a microbubble generating device

Figure 3 is a schematic cross-sectional view of the gas-liquid separator of the microbubble generating device

4 is a schematic cross-sectional view of the ejector of the microbubble generating device;

Figure 5 is a schematic application of the wastewater treatment system according to the conventional dissolved air flotation method

* Description of the symbols for the main parts of the drawings *

A. Wastewater Treatment System

2. Micro bubble generator 3. Floating tank

11. Wastewater discharge conduits 21. Surfactant mixture

22. Circulating water outlet pipe 23. Air inlet pipe

24. Ejector 26. Tank

28. Gas-liquid separator

Wastewater treatment system (A) using a micro-bubble generating device according to an embodiment of the present invention, as shown in Figure 1, the flocculation tank (1) and the flocculation tank (1) to inflow and agglomeration of the wastewater, It includes a microbubble generating device (2) connected to the wastewater outflow conduit (11) to be transported wastewater, and a floating tank (3) connected to the wastewater outflow conduit (11) and mixed with the wastewater and microbubbles. .

As shown in FIG. 2, the microbubble generating device 2 includes a surfactant mixing part 21 in which a surfactant and circulating water are mixed, and a circulating water outlet conduit flowing out of the surfactant mixing part 21 ( 22 is connected to a separate air inlet pipe 23 is connected to the injector 24, the air is introduced together with the inflow of the circulating water, and the tank 26 is filled with bubbles and the circulating water discharged from the ejector 24 And a gas-liquid separator 28 connected to the mixed outflow conduit 27 through which bubbles and circulating water flow out from the tank 26 and having an upper gas port outlet portion and a lower circulating water discharge portion so as to separate the bubbles and the circulating water. ).

In this embodiment, the surfactant mixture 21 is composed of a surfactant container 211 containing a surfactant and a circulating water pipe 212 through which the circulating water is introduced, but the mixed water mixed with the surfactant may be supplied to the circulating water pipe. Of course.

The ejector 24, as shown in Figure 4, one end is connected to the circulation water outlet conduit 22, the air inlet pipe 23 is connected to the intermediate bottleneck section through which the circulation water passes.

The ejector 24 has a high flow rate (water + surfactant) is passed through the ejector 24, the flow rate is faster in the bottleneck part of the ejector 24, and the high velocity pressure forms a vacuum air inlet pipe Through (23), air which is considerably lighter than the liquid from the outside of the ejector is sucked into the ejector to form bubbles in the liquid circulation.

The gas-liquid separator 28 only needs bubbles to float SS aggregated in the waste water in the flotation tank, and the circulating water other than the bubbles does not provide any help, so the separator used to send only the bubbles in the circulating water to the wastewater treatment process. As a key part of the present invention.

The gas-liquid separator 28 is composed of a cylindrical upper gas port outlet portion 281 and a conical lower circulation water discharge portion 282, the cylindrical upper gas port outlet portion 281 is a mixed outflow conduit ( 27) is connected in a tangential direction, and the bubble outlet pipe 283 is connected to the upper portion of the photo outlet portion 281, and the circulating water discharge portion 282 of the conical lower portion is composed of a circulating water outlet tube 284. have. The circulating water sucked by the tangential inflow on the gas port separator 281 of the gas-liquid separator 28 is rotated along the outer wall of the cylinder by the inflow speed and lowered toward the circulating water discharge part 282 of the conical lower portion. do. At this time, the centrifugal force is applied by the rotation of the circulating water so that the liquid in the circulating water is located toward the wall of the gas-liquid separator, and the bubble part with smaller specific gravity is located in the center of the gas-liquid separator. Sufficient residence time is required to separate by the difference in specific gravity. So the length of the gas port outlet portion 281 of the cylindrical portion of the gas-liquid separator 28 should be 400mm to 500mm, the angle of the cone portion of the circulating water discharge portion 282 should be 70 ~ 80 degrees and efficient bubble separation is made The pressure of the upper and lower discharges of the gas-liquid separator 28 should be maintained at 1.5 to 2.0 kg / cm². If the pressure drops below 1.5 kg / cm² at the upper discharge, the circulating water will flow out relatively compared to the bubbles, If the amount is increased and the pressure is more than 2kg / cm², the amount of bubbles is reduced by the top discharge, making it difficult to operate the microbubble generating device.

The bubble outflow pipe 283 of the gas-liquid separator 28 is connected to the wastewater outflow conduit 11 through which the waste water aggregated in the flocculation tank 1 flows out so that the high-purity microbubble liquid flows into the flotation tank 3. It is.

Wastewater treatment system (A) using a micro-bubble generating device according to the present invention having such a configuration, when the surfactant is mixed in the circulating water or industrial water in the surfactant mixing unit 21 to flow into the ejector 24 at high speed ejector A vacuum is formed in the bottleneck section in the air, and the air is sucked into the ejector 24 from the air inlet pipe 23 connected to the bottleneck section, and the sucked air is formed into microbubbles in the solution and the surfactant in the solution. Because of this, the bubbles do not merge with each other, and the volume of water and air is filled in the tank 26 to about 8: 2. As such, the circulating water in the tank 26 is sucked using the pump P1 to separate the bubbles and the solution from the circulated water mixed with the solution (water + surfactant) and the microbubbles filled in the tank 26, and the gas-liquid separator If the flow rate is 3 to 5 m / sec in the 28, the introduced circulating water is lowered while rotating by the internal structure of the gas-liquid separator 28. At this time, the discharge time of the upper bubble and the discharge of the lower circulating water are interrelated with the proper residence time until the circulating water enters into the gas-liquid separator 28 and is discharged to the lower part and the upper part, and the pressure required to exit the circulating water from the upper discharge and the lower discharge. Because of the large flow rate difference and the density of 1000 kg / m³H₂O solution and 1.29 kg / m³Air air, due to the proper residence time of the circulating water in the gas-liquid separator, the light bubbles inside the gas-liquid separator 28 are upwards. And heavy solutions move downwards relative to air. At this time, the higher the inflow rate of the circulating water flowing into the gas-liquid separator 28, the shorter time it takes for the bubbles and solution in the circulating water to move up and down, but there is a disadvantage that the power of the pump (P1) is relatively high, the proper inflow rate It is designed considering economics. In this way, the bubbles separated only by bubbles are introduced into the wastewater outflow conduit 11 in which the wastewater flows from the flocculation tank 1 to the flotation tank 3 in order to separate the SS aggregated in the flocculation tank 1 from the wastewater. Bubbles mixed in the waste water enter the flotation tank (3) and the bubbles rise in the waste water flow due to the low specific gravity of the bubbles. At this time, as the bubble rises, the SS in the waste water floats upward, and an oil skimmer (not shown) removes the SS released from the flotation tank. In this way, by removing as much of the remaining solution as possible from the circulating water as much as possible, only high-purity microbubble liquid having a volume ratio of solution and bubble of 1: 1 is introduced into the flotation tank. Compared with the installation of smaller floating jaw size, the installation area becomes smaller.

And the gas-liquid separator 28 for gas-liquid separation in the present micro-bubble generator (2) is one or two, if necessary, and the circulating water discharged from the circulating water discharge portion 282 of the lower portion of the gas-liquid separator 28 (Water + surfactant + bubble) flows out at a very high speed, and the high speed circulating water strikes the surface of the circulating water stored in the tank 26 and generates another bubble in the circulating water. In the circulating water of), the mixing ratio of bubbles is improved. For this purpose, it is possible to expect continuous and continuous wastewater treatment efficiency due to the low investment cost, reduced installation area, and rapid response to the change of wastewater properties in wastewater treatment. Especially, it is applied to manure wastewater or livestock wastewater with high SS concentration. This can protect the environment with considerably less investment and maintenance cost than PAF, which is a conventional treatment facility.

As described above, the wastewater treatment system using the microbubble device of the present invention uses only the actual bubbles in the circulating water generated by using the ejector to separate the circulating water having a high content by using the gas-liquid separator (the circulating water circulation rate is 2 ~ 3% of wastewater treatment volume) As compared to the existing treatment methods, floating tanks, pumps, and installation area are smaller, which means lower investment cost, operation cost, and installation area are smaller, and more wastewater can be treated at the same time. Wastewater treatment costs are lower than the existing air treatment method, which is an existing treatment facility, resulting in higher product competitiveness at the workplaces that discharge wastewater.

Claims (1)

A surfactant mixing part which is mixed with a surfactant and a circulating water, an ejector which is connected to a circulating water outlet conduit flowing out of the surfactant mixing part and a separate air inlet pipe is connected and air is introduced together with the inflow of circulating water; The bubble discharged from the ejector and the tank filled with the circulating water, and the mixed discharge conduit from which the bubble and the circulating water is discharged from the tank and connected to the upper gas port and the lower portion of the circulating water discharge to separate the bubble and the circulating water And a bubble outflow tube of the microbubble generating device having a gas-liquid separator is connected to a wastewater outflow conduit through which the wastewater condensed in the flocculation tank flows out, and the high-purity microbubble liquid flows into the flotation tank.