KR20020094738A - Air bubble generating apparatus - Google Patents

Abstract

PURPOSE: A bubble generator is provided, which injects fine air bubble of 30 to 50 μm in diameter continuously in influent to catch foreign substances laden in influent by air bubble so that the foreign substances are enabled to float by buoyancy of the air bubbles to remove the foreign substances from the influent. CONSTITUTION: The bubble generator comprises a triple-tube structure concentrically monolithically formed by an outermost tube(13), a middle inner tube(14) and a small inner tube(15); the outermost tube(13) with the upstream end closed and the downstream end connected to the down stream of a flow channel(12); the middle inner tube(14) set in the outermost tube(13) to have the ends of upstream and downstream and to have spurt holes in a row around the whole surface for passing liquid to generate air bubble; the small inner tube(15) set in the middle inner tube(14) to have the downstream end closed and the upstream connected to the flow channel(12), and to have spurt holes(17) in a row around the whole surface for passing liquid to generate air bubble.

Description

Bubble generating device {AIR BUBBLE GENERATING APPARATUS}

According to the present invention, in the closed waters such as ponds, lakes, and reservoirs, the nearby living wastewater and livestock wastewater flows into the water, and nutrients such as nitrogen and phosphorus increase in the water. Pressurize the air to dissolve the liquid and release the liquid under atmospheric pressure to discharge the dissolved air as microbubbles by the microbubble generator 5 to dissolve oxygen in the air to separate the suspended suspended solids in water with bubbles. The present invention relates to a bubble generator of a pressurized flotation solid-liquid separation system.

In general, when the water is purified by the direct treatment purification method in the closed water, microbubbles are generated by the microbubble generator 5 in the raw water to be treated and the suspension contained in the raw water is brought into contact with water and the microbubbles. Microbubble generator (5) method is used in so-called pressurized separation (DAF = Desolved air floatation) to separate choloids.

Pressurized flotation using microbubbles is one of the solid-liquid separation methods using the microbubble generator 5, and bubbles in solids having a lower density than water, particularly solids having a lower density than water, have a low density. As a method of separating the flotation by reducing the specific gravity to the volume by attaching, the greater the amount of gas attached to the solid is better because the driving force of the flotation uses buoyancy due to density difference. Gas micro-foam generator 5 is generally difficult to discuss uniformly because the adhesion of air to solids depends on the properties of solid particles, the diameter of solid particles, and the diameter of bubbles, but it is generally possible to increase the amount of gas attached. It is good to generate one fine bubble. For this purpose, once the gas is dissolved in water under pressure, it is released under atmospheric pressure, and the supersaturated gas is bubbled into the microbubble generator 5 and discharged into the water to generate the floating separation microparticle generator 5. The bubble is carried out within a number of 10 to 100 µm in diameter. In other words, flocculant was added to the flocculant during flocculation to make flocculation floc microfloating device 5 (凝集 泥 = floc), and the flocculation floc was adsorbed to the flocculation floc to float the surface of flocculation flocculation apparatus 5 (凝集 泥) to the surface. Water micro-foaming device 5 (floating floc) is recovered to improve water quality. As a method of using flocculation floc, there is a case of directly conducting in a closed water and an indirect treatment method in which sewage water is sucked into a sedimentation tank or a treatment tank to separate solid liquor and then treated water is discharged back into the water and returned. In either case, however, the diameter and uniformity of the bubble diameter is important. The finer the bubble, the higher the adsorption rate and quietly floating, and no bubbles in the upper layer to destroy the adsorbed floc or suspended solids. Some parts of floating flocculation microbubble generator 5 (浮 泥) are likely to reprecipitate by aggregate agglomerate microbubble generator 5 (self-weight) after a certain period of time. In some cases, aeration may be used in combination.

However, the apparatus for purifying by such pressure flotation separation is usually a problem of the bubble generation method and its size, the amount of dissolution, the formation of flocculation flocs, the weight reduction of the device. Related patents in this field include Korean Patent Application Publication No. 2000-201 (2000.1.15) and Japanese Patent Application Publication No. 2000-314 (2000.1.15) and Japanese Patent Publication No. 1996-131800 And Japanese Laid-Open Utility Model Publication No. 1990-112321. The principle of bubble generation of these prior arts is to use a pressure injection means to mix gaseous liquid in a turbulence vessel, store it in a dissolution tank, pressurize it, and release flotation by directly discharging the flocculant when it is discharged into water under atmospheric pressure. Doing.

However, in the case of pressurized floatation separation technology, a similar principle is applied in terms of using microbubbles in each prior art, but the method of generating bubbles varies in performance and device size, and there are also differences in characteristics.

In addition, in the prior art, the generation of fine bubbles of 50 µm or less has problems in the size of the apparatus and the flotation ability, which impedes the adoption in large water bodies in improving the efficiency of the purification treatment.

The present invention therefore provides an apparatus for generating fine bubbles of 50 μm or less. That is, the three-cylindrical container structure with different diameters is integrated on the coaxial micro-foaming device 5 on the downstream side of the suction flow pipe of raw water, and the outermost cylinder is connected to the downstream flow pipe at the end of the outermost cylinder. The two smaller and smaller inner cylinders are sealed together so that one end of the downstream side has turbulent flow in the suction source and is installed to be shorter than the outermost cylinder, and each has a plurality of outlets with different apertures. To provide a bubble generating device consisting of a single conventional container structure.

1 is a view showing the overall overview of the bubble generator;

2 is a cross-sectional view showing a microbubble discharge device;

Figure 3 is a longitudinal and cross-sectional view showing an enlarged intestinal tube in Figure 2,

Figure 4 is a longitudinal and cross-sectional view of the inner tube separate from Figure 2,

Fig. 5 is a diagram showing an underwater SEM photograph of microbubble particles photographed by the apparatus of the present invention.

1. Compressor 2. Flowmeter

3. Pressure tank 4. Check valve

5. Bubble generator 6. Coagulant tank

7. Turbine Pump 8. Submersible Pump

9. Ejector 12. Euro tube

13. Outer view 14. Inner view

15. In-house building

17. In-house pipe and ejection hole 18. Closed end

d1. In-house pipe diameter

d2. Inner tube diameter d3. Outer view diameter

L. Outermost view length L1. The length of the inner and inner tubes

L2. In-house pipe ejection length L3, L4 In-house pipe ejection length

L5. In-house pipe ejection spacing interval

L6. Inner tube ejection hole spacing

Hereinafter will be described in detail based on the embodiment of the configuration and operation of the present invention.

1 shows an overall flowchart of the bubble generator. The pressurized flotation system using the microbubble generating device 5 receives pumps 7 and 8 for sucking dirty water, and ejector 9 for mixing air with raw water taken by the pump and gas-liquid mixture supplied from the ejector 9 to receive fine bubbles therein. Pressurizing the coagulant tank and the gas-liquid mixed solution for storing the microbubble generating device 5, and the compressor 1 for giving air pressure for spraying the gas-liquid mixed solution of the microbubble generating device 5 into the water, and the coagulant added to the microbubble generating device 5; It consists of a pressurized tank which is discharged by air.

In Fig. 1, the raw water is pumped into the submersible pump 8, the valve is opened, the turbine pump 7 passes through the turbine pump 7, and the air is injected into the raw water from the ejector 9 of the injection type, and the raw water flows into the microbubble generating device 5. At the same time, pressurized air generated in the compressor 1 operating in the same flows into the microbubble generator 5 to discharge the gas-liquid mixture to the outside of the microbubble generator 5. Meanwhile, a flow meter 2 and a valve are installed in the flow path between the compressor 1 and the micro bubble generator 5 to control the amount of pressure air flowing into the micro bubble generator 5.

If necessary, chemical liquids such as a flocculant are injected from the coagulant tank 6 into the microbubble generating device 5 to agglomerate the suspended substances contained in the gas-liquid mixture.

The mixed liquid discharged from the microbubble generating device 5 is stored in the pressure tank 3 and is pressurized and discharged into the original water through a nozzle (not shown).

The raw water taken out as described above returns to the original water with the suspended solids contained by the flocculant and the microbubbles adhered to the surface thereof, and the suspended solids are floated due to the floating force of the bubbles.

The injured colloidal contaminants are collected by a collection device not shown to purify the water.

Although not shown in the present invention, the ejector 9 is connected to an air inlet pipe for introducing air into the pipe having a smaller diameter than the flow pipe for sucking the raw water 11. As the flow pipe becomes narrow in the ejector 9 installed in the middle of the flow pipe, the static pressure of the liquid in the flow path is extruded in the advancing direction, and due to its pulling, the raw water 11 is sprayed to form a gas-liquid mixture flow when the gas flows in the ejector 9 Transfer to generator 5.

Hereinafter, the microbubble generating device 5 will be described in detail.

FIG. 2 is a sectional view of the microbubble discharge device 5 of the present invention, and FIG. 3 is an enlarged view showing the small inner tube 15 and the inner inner tube 14 in FIG. 4 is an enlarged view of the inner tube 14 having a shape position of the ejection hole different from that of the inner tube 14 of FIG.

The microbubble generating device 5 has a triple tube structure as shown in FIG. That is, the outermost tube 13 in the outermost layer, the small inner tube 15 in the innermost layer, and the middle inner tube 14 are integrally formed coaxially.

One end of the inner pipe 15 is connected to the upstream side of the flow pipe 12, and one end of the outermost pipe 13 is connected to the downstream side of the flow pipe 12.

The inner tube 15 and the inner tube 14 are each formed with a plurality of blow holes 17 and 16.

The ejection hole 17 of the inner tube 15 is formed on the entire surface of the circumference at a constant portion (as long as L2 in Fig. 3). The region formed in the jet hole 17 is not necessarily limited to this, and any area can be formed as long as it can form a lot of fine bubbles.

On the other hand, the blowing hole 16 of the inner tube 14 is formed parallel to the tube along one side of the circumference. This deviated from the position of the jet hole 17 of the inner pipe 15 and also changed its diameter.

Hereinafter, the generation of micro bubbles using the micro bubble generator 5 will be described.

The flow path tube 12 sucks the raw water in the advancing direction, and at the same time, the flocculant is injected from the coagulant tank 6, and at the same time, the pressure air generated by the compressor 1 and regulated by the flow meter 2 in the flow path tube is sucked in.

The raw water flowing into the microbubble generating device 5 together with the pressure air and the flocculant is first injected into the small pipe 15 by the small pipe injection ejector, and then proceeds back to the closed end 18. The raw water is divided into the inner tube 14 through the inner tube spout hole 17. On the other hand, as the raw water continues to flow into the inner tube 14, the pressure in the inner tube 14 is increased, and the raw water of the inner tube 14 is spouted into the leftmost tube 13 through the inner tube spouting hole 16.

As the raw water exits through the jet holes 17 and 16, fine bubbles are generated as the raw water is divided, and these bubbles are attached to the surface of the polluted suspended solids contained in the raw water.

In the microbubble generating device 5, the flow is delayed in the downstream pressurized mixing section at the downstream end of the inlet pipe 15 at the time of inflow into the flow path tube 12, and the static pressure increases. Repeatedly ejected into the inner tube ejection hole 16. At this time, the gas-liquid mixture flow is accelerated by the nozzle of the outlet of the pressure mixing section, and the static pressure is lowered again so that the gas dissolved in the liquid is precipitated as microbubbles, and dissolved by turbulent flow when passing through the jet hole (= nozzle). The bubbles are divided and subdivided to generate fine bubbles.

In other words. The microbubble generating device 5 of the present invention is integrated with a triple cylindrical container structure having different diameters on the same axis on the downstream side of the raw water suction flow path tube, and the outermost tube 13 is connected to the downstream flow path tube at its end. In addition, two medium and small internal pipes 14 and 15 having a smaller diameter than the outermost pipe 13 are installed, and the suction source water collides at the end thereof and flows backward to seal each other in the middle jet holes 16 and 17 so that they can be ejected together. Appearance 13 Shorter than the length.

Also, as shown in Fig. 2, the blowhole 17 of the inner tube 15 is separated from the downstream end of the outermost tube 13 by 08 to 1.0 L2, and between 1.6 d1 from the upstream end of the outermost tube 13. Formed. It is also about 3-4mm in diameter.

In addition, although the number of blow holes is arbitrarily adjusted according to the pressure inside a pipe, the area of the part in which the inside pipe blow hole 17 was formed may be normally provided in the range of 1 / 4-1 / 5 of the area ratio of the inside pipe 15.

The ejection hole 16 of the inner tube 14 may have a size of 0.75 d1 on one side based on the diameter of the small tube d1. In this case, the pressure in the microbubble device is adjusted to about 4-5 kg / cm 2.

In addition, the length L of the outermost tube 13 of the cylindrical container 5, which is a microbubble generating device 5, may be within about 10d of the channel 12. This typically assumes turbulent dissolution of a gas-liquid mixed phase, which is generally two-phase, in consideration of the transfer interval and velocity of the fluid based on the proper flow rate when the fluid flows in the conduit.

On the other hand, although not shown in the pressure tank 3 is provided with an exhaust hole in order to maintain the proper pressure, it takes a configuration that can send the excess air to the outside by adjusting the pressure in the pressure tank 3.

In the present invention, the coagulant drug used in the microbubble device 5 is usually used as aluminum sulfate (Al (SO ₄ ) ₃ ) or polyaluminum chloride (PAC = polyaluminium chloride) and as a neutralizing agent for pH adjustment. (Edible lime = Ca (OH) ₂ ), etc. may be used.

This invention is not limited to an Example, It can apply and use irrespective of the scale of oil-water separation and operation | work.

In addition, the embodiment has a structure in which the microbubble generating device is a triple tube, but is not limited thereto and may have a double tube structure. In other words, it may be composed of the outermost tube and the inner tube or the outer tube and the inner tube.

By using the apparatus of the present invention, the water purification time can be shortened by discharging microbubbles continuously in a large amount of sewage water in the closed water, and because of the release of ultra-fine bubbles having a diameter of 30-50 µm or less The water quality is activated by supplying sufficient dissolved oxygen in the water with good efficiency and aeration effect.

FIG. 5 shows that the microbubble generating device 5 of the present invention was produced as a prototype for the test, and the size of the bubbles was taken by SEM photograph. As shown in Figure 5, the diameter of the bubble is shown to be between 30-50㎛.

Therefore, the device according to the present invention has an effect that can generate fine bubbles than the conventional device.

Claims (5)

Bubbles are generated in the inflowing liquid, and bubbles are attached to the surface of the foreign matter contained in the liquid, and the foreign matter is lifted by the floating force of the bubble, and the foreign matter is removed from the liquid. In the bubble generating device, Has a structure of a multi-pipe in which a plurality of pipes are integrally formed on the same axis, In the multi-pipe the upstream end of the outermost pipe is closed and its downstream end is connected to the outlet, The tube inside the outermost tube has an inlet for receiving liquid, and the upstream end is closed. In the pipes other than the outermost tube, a blowing hole is formed in which bubbles are generated while the liquid passes, The incoming liquid impinges on the downstream end of the inner tube and passes through the ejection hole to generate air bubbles and is discharged to the outlet through the downstream end of the outermost tube. Bubble generator characterized in that. The method of claim 1, The triple tube structure with two tubes inside the outermost tube, The ejection hole formed in one of the ejection holes formed in the other and the diameter of the Bubble generator characterized in that. The method of claim 2, The ejection hole formed in either one is formed in a line along the longitudinal direction of the pipe, That is formed on the entire surface of the circumference at the ejection hole formed at the other side and at a certain portion in the longitudinal direction Bubble generator characterized in that. The method of claim 1, It is further provided with an air injector for injecting air into the incoming liquid before the inlet. Bubble generator characterized in that. The method of claim 4, wherein The air injector is to be installed in a small place where the diameter of the pipe to which the liquid is transported smaller than before and after Bubble generator characterized in that.