KR20110114965A - Cutting oil filtering system using micro-bubble - Google Patents

Abstract

The present invention relates to a pretreatment apparatus that separates and removes oil before being sent to a wastewater treatment plant, which is used in a metal processing process and is discarded at the end of its life, and is configured to float and separate oil components using microbubbles. Cutting wastewater oil separation can significantly reduce the amount of chemicals used compared to the conventional chemical treatment method, and significantly reduce the amount of CO2 and COD contained in the pretreated water (oil separated wastewater), enabling stable operation of the wastewater treatment plant. Relates to a device.
According to the cutting wastewater oil separation apparatus of the present invention, the oil separation process, that is, the cost of cutting wastewater pretreatment process, such as chemical cost, as well as the operating cost of the wastewater treatment plant, the sludge treatment costs can be reduced.

Description

Cutting waste oil separation device using microbubble {Cutting oil filtering system using micro-bubble}

The present invention relates to a cutting wastewater treatment apparatus, and more particularly, to a cutting wastewater pretreatment apparatus for separating and removing an oil component from a cutting wastewater used in a metal processing process and then sending the wastewater from which the oil component is separated to a wastewater treatment plant. .

In general, metal working oil is used for various purposes such as improving the metal surface of a workpiece, improving workability, extending tool life, rust-preventing workpieces, removing heat and chips, and the like in processing metal workpieces.

Such metal working oils can be largely classified into water-insoluble, water-soluble, synthetic, and semi-synthetic. Among them, water-soluble metal working oils having good cooling, welding (prevention of welding), high temperature wear prevention, and anti-warpage effect due to residual heat are used.

The water-soluble metal working oil is an emulsion-type fluid in which 20 chemical substances such as water, base oil (crude refined oil) and additives are mixed. In the process of being used, deterioration, inflow of other oils (working oil, etc.), cutting chips Residuals, etc., cause microbial habitat to change to easier conditions.

When microorganisms multiply, the metal working oil decays, the concentration decreases, the odor is generated, and the cutting performance is greatly reduced.

Therefore, the metal working oil whose cutting performance is deteriorated should be replaced with new oil. At this time, the water-soluble metal working oil discarded is the cutting waste water.

Cutting wastewater is an emulsion wastewater in which the oil component is dispersed in water by an anionic surfactant, and the content of the oil component is about 10%.

For this reason, the disposal method of cutting waste water is different from the disposal method of non-aqueous metal processing oil. The non-aqueous metal processing oil is classified as waste oil and consigned, but the cutting waste water is transferred to a waste water treatment plant for treatment.

However, the oil content of the cutting waste water may act as a toxic substance to activated sludge and if discharged without proper treatment, it may exceed the emission limit. It may violate the ecotoxicological regulations of wastewater treatment plant effluent.

Accordingly, it is necessary to remove oil components from the cutting wastewater through the appropriate pretreatment as much as possible, then consign the waste oil separated from the wastewater, and transfer the wastewater from which the oil is separated to the wastewater treatment plant for stable treatment.

In other words, after the process of separating the oil components from the cutting waste water, the collected oil is treated with waste oil, and the waste water from which the oil is separated is sent to a wastewater treatment plant, where water treatment is required to satisfy regulations.

Chemical treatment methods for separating oil from cutting wastewater include acid-base treatment, ferrous sulfate treatment, ferric sulfate treatment, and the like, and physical treatments include ultrafiltration treatment and heat evaporation / condensation treatment.

Here, the acid-base treatment method adds a strong acid to the alkaline waste liquor to remove the oil by adding an inorganic salt (alum, iron salt, etc.) at a pH of 2.5 to 3, followed by adding strong alkali to pH 7-8. After making a strong stirring it is a method of producing a precipitate.

This treatment method has a disadvantage in that the water quality of the treated water is good but the amount of chemicals (acids, alkalis, inorganic salts, etc.) is large.

In addition, the ferrous sulfate / ferric sulfate treatment method has to be treated by diluting the waste liquid 5 to 10 times, a large amount of sludge generation, there is a disadvantage to be particularly careful when treating the sludge landfill.

In case of ultrafiltration, the operating cost is cheaper than chemical treatment, but the initial investment cost is high, and the brain is sensitive to pH and can be easily damaged if it does not match the waste liquid.

In addition, heat evaporation / condensation treatment is a method of separating oil by heating below the boiling point of the waste liquid. The oil separation efficiency is excellent but energy cost is high. There is a problem.

Accordingly, the present invention has been invented to solve the above problems, and is a pretreatment apparatus that separates and removes oil components before sending them to the wastewater treatment plant, which is used in a metal processing process and is discarded at the end of its life. Compared with chemical treatment method, cutting waste water oil separation device can be used to reduce the amount of chemicals significantly and to reduce the amount of CO2 and COD in pre-treated water (oil separated waste water), so that the waste water treatment plant can be operated stably. The purpose is to provide.

In addition, an object of the present invention is to provide a cutting waste oil separation device that can reduce the operating cost of the waste water treatment plant, the sludge treatment costs as well as the cost of the oil separation process, that is, the cost of cutting waste water pretreatment such as chemical costs.

In order to achieve the above object, the present invention is a device for separating and removing the oil component before the wastewater used in the metal processing process to send to the wastewater treatment plant that is discarded at the end of its life, the cutting wastewater and chemicals are supplied A mixing device for mixing and condensing oil components in the cutting waste water with a chemical to form an oil floc; The microbubbles are supplied to the mixed solution of the cutting wastewater and the chemical discharged from the admixture, so that the oil floc in the mixed liquor floats with the microbubbles attached thereto, and the injured oil floc is removed by the float collector installed above. And a flotation separator which collects and transfers the treated water from which the oil flocs have been removed to a wastewater treatment plant. It provides a cutting waste oil oil separation apparatus using a micro-bubble; including a micro-bubble supply device for generating a fine bubble to provide to the flotation separator.

Here, the flotation separation device, the mixed solution of the wastewater-drug containing the oil floc is supplied from the admixture through the mixed liquid transfer pipe and the microbubble is supplied through the microbubble injection tube from the microbubble supply device and the oil floc A separation tank which floats by this microbubble to separate solid-liquid; A float collector for removing and collecting the flocculated oil flocs in the separation tank; A sludge storage tank in which an oil floc collected by the float collector is stored; A treated water storage tank into which the treated water from which the oil plug is removed from the separating tank is introduced and discharged; It may be configured to include; a treatment water transfer pipe connected to the treatment water storage tank for transferring the treated water to the wastewater treatment plant.

In addition, the mixed liquid conveying pipe for transporting the wastewater-drug mixed liquid containing the oil floc in the mixing device is connected to the mixed liquid inlet of the separation flotation device, the micro-bubble injecting pipe supplied with the microbubble from the microbubble supply device It is connected to the mixed liquid inlet portion, it is possible to be supplied to the flotation separator in a state in which the waste water-drug mixed liquid supplied from the admixture and the micro bubbles supplied from the micro bubble supply device are mixed.

In addition, the mixed liquid inlet portion is connected to the mixed liquid conveying pipe and the micro-bubble inlet pipe and the injection port is mixed with the waste water-drug mixture and the micro-bubble injection; An injection body located in the separation vessel in the separation flotation device and connected to the injection port and introduced from the injection port in a state in which the waste water-drug mixture liquid and the microbubble are mixed; It may be configured to include; the injection body is formed at predetermined intervals in the injection body and the spout for ejecting the mixed waste water-drug mixture and micro-bubbles.

Here, a primary flotation plate may be installed in the separation tank and disposed around the jet port to guide upward of the wastewater-drug mixture and the microbubble discharged from the jet port.

In addition, a separate microbubble injection tube branched from the microbubble injection tube is additionally connected to the flotation separator, and the branched microbubble injection tube is connected to a spout pipe installed at a lower portion of the separation tank of the flotation separator, and the blowout The pipe is provided with a jet port at predetermined intervals, the micro-bubble supplied from the micro-bubble supply device may be configured to be further supplied through the jet pipe and the jet port.

Here, a secondary floating plate may be installed in the separation tank and positioned around the ejection port of the ejection pipe to guide the fine bubbles ejected from the ejection port upward.

In addition, the microbubble supply device may be configured to recycle some of the treated water discharged from the flotation separator to provide the flotation device in a state in which the microbubbles are mixed with the recycled treated water.

In addition, the micro-bubble supply device, and the recirculation pipe for recirculating the treated water discharged from the flotation separator; A recirculation pump installed in the middle of the recirculation pipe to pump and pump the treated water through the recirculation pipe; An air inlet port installed in a recirculation pipe upstream of the recirculation pump and into which external air is introduced; A microbubble generator extending in the downstream side of the recirculation pipe and mixing and mixing the air in the treated water into a microbubble shape while transferring the treated water and the air introduced through the air inlet; It may be configured to include; microbubble injection pipe for connecting to the microbubble generator in the outlet side to provide the treated water mixed with microbubbles to the flotation separator.

In addition, the microbubble generator may include a microbubble generating tube having a structure in which the cross-sectional area of the flow path is repeated to increase or decrease the flow velocity in each section of the flow path through which the treated water passes along with air, wherein the microbubble pipe is spiral It may be provided in a wound structure.

Accordingly, according to the cutting wastewater oil separation device of the present invention, as a pretreatment device that separates and removes oil components before sending the cutting wastewater, which is used in a metal processing process and is discarded at the end of its life, to the wastewater treatment plant, using microbubbles Since the oil component is floated and separated, the amount of chemicals can be significantly reduced compared to the conventional chemical treatment method, and the amount of CO 2 and the COD contained in the pretreated water (oil separated wastewater) are greatly reduced, thereby making the wastewater treatment plant stable. It is effective to operate as.

In addition, the cutting wastewater oil separation apparatus of the present invention has the advantage of reducing the operating cost, sludge treatment costs of the wastewater treatment plant as well as the cost of the oil separation process, that is, the cost of cutting wastewater pretreatment, such as chemical costs.

1 is a view showing the overall configuration of a cutting waste oil separation apparatus according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the configuration of the mixing apparatus in the cutting wastewater oil separation apparatus according to an embodiment of the present invention.
3 is a plan view of the admixture shown in FIG. 2.
Figure 4 is a schematic diagram showing the configuration of the flotation separator in the cutting waste water oil separation apparatus according to an embodiment of the present invention.
5 is a plan view of the flotation separator shown in FIG.
Figure 6 is a schematic diagram showing the configuration of the microbubble generator in the flotation separator shown in FIG.
7 is a view showing the principle of oil separation using micro-bubbles in the present invention.
8 is a view showing the floating principle of a solid using a micro-bubble.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting wastewater pretreatment apparatus, and more particularly, to a water soluble metal processing oil that is used in a metal processing process and that is disposed of at end of life, that is, a pretreatment apparatus for separating and removing oil components before sending the cutting wastewater to a wastewater treatment plant. It is configured to separate oil components using microbubbles, which significantly reduces the amount of chemicals used compared to conventional chemical treatment methods, and greatly reduces the amount and COD of oil components contained in pretreated water (oil separated wastewater). The present invention relates to a cutting waste oil separation device that can stably operate a treatment plant.

The cutting wastewater oil separation apparatus of the present invention can reduce the cost of the oil separation process, that is, the cost of the pretreatment process of the cutting wastewater, such as chemical costs, as well as operating costs and sludge treatment costs of the wastewater treatment plant (processing wastewater from which oil is separated). Will be.

In the present invention, since the oil separated from the cutting waste water (recovered waste oil) can be classified as waste oil and can be consigned and can be sold free of charge, it is important to maximize the amount of oil separated and reduce the chemical cost to achieve cost reduction. Do.

Hereinafter, a configuration of a cutting wastewater pretreatment device, that is, an oil separation device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the overall configuration of the cutting waste water oil separation apparatus according to an embodiment of the present invention, Figure 2 is a schematic diagram showing the configuration of the mixing device 100 in the cutting waste water oil separation device, Figure 3 is a mixing device ( 100) is a plan view.

4 is a schematic view showing the configuration of the flotation separator 200 in the cutting wastewater oil separation apparatus according to an embodiment of the present invention, Figure 5 is a plan view of the flotation separator 200, Figure 6 is a flotation separator 200 ) Is a schematic diagram showing the configuration of the microbubble generator (320).

The oil separation device of the present invention is a pretreatment device for separating oil components from cutting wastewater and sending the wastewater from which oil components are separated to a wastewater treatment plant. The oil separated from the cutting wastewater is stored in a sludge form and discharged. In other words, the treated water (wastewater) from which oil is separated is transferred to a wastewater treatment plant to undergo a normal wastewater treatment process.

Looking at the configuration, the oil separation device of the present invention, the chemical mixing device 100 for agglomerating the oil components in the cutting waste water using a chemical to form an oil flop (floc); The microbubbles are supplied to the mixed solution of the cutting wastewater and the chemical introduced from the admixture device 100 so that the oil flocs and the microbubbles in the mixed solution are floated while being attached to each other. A flotation separator (200) for separating oil from the mixed solution to collect oil flocs, and transferring the treated water from which the oil flocs have been removed to a wastewater treatment plant; It is configured to include; micro-bubble supply device 300 for generating a micro-bubbles to provide to the flotation separator 200.

In such a configuration, the mixing apparatus 100 supplied with cutting wastewater and chemicals agitates the cutting wastewater and chemicals, destroys an emulsion of oil components in the cutting wastewater, and then aggregates the oil flocs (floats and suspensions to each other to the naked eye). Solids formed to a size that can be seen), and the flotation separator 200 receives the wastewater in which the oil floc is formed, mixes it with the microbubbles, and floats the oil floc onto the liquid level in the wastewater by the microbubble. ), The oil floc is collected and removed.

In addition, pretreated water, ie wastewater from which oil flocs have been removed, is discharged to a wastewater treatment plant (not shown).

As a result, the present invention provides cutting wastewater and chemicals, emulsion breakdown and stirring oil floc by stirring with chemicals, flotation of oil floc using microbubbles (solid-liquid separation), removal of oil floc using float collector 220. In this case, there is a continuous oil separation device in which the discharge of the treated wastewater and the transfer to the wastewater treatment plant are carried out in a continuous process.

1 to 3, the mixing device 100 will be described in more detail. The mixing device 100 is supplied with cutting wastewater and chemicals, and condenses oil components in the cutting wastewater by the chemicals during stirring. The rapid mixing tank 110, the slow mixing tank 120, the rapid mixing tank 110, the oil mixture is agglomerated and enlarged when the mixed mixture of cutting waste water and chemicals is supplied from the rapid mixing tank 110, and rapid mixing tank 110 And mixing apparatuses (131, 132) installed in the slow mixing tank (120), respectively, to stir the cutting waste water and the chemicals, and the mixed liquid discharge portion formed in the slow mixing tank (120) to discharge the wastewater-chemical mixture including an oil floc. 140 and the mixed liquid conveying pipe 150 connected to the floating separator 200 from the mixed liquid outlet 140 to transfer the wastewater-drug mixed liquid discharged from the slow mixing tank 120 to the floating separator 200. ) Is the main configuration.

First, the rapid mixing tank 110 is connected to receive the cutting waste water and the chemicals from the waste collection tank (1) and the chemical storage tank (3), respectively, is connected through the pipe from the waste collection tank (1) to cut the waste collection tank (1) A waste water supply pump 2 for pumping and supplying waste water and a chemical injection pump 4 connected to a pipe from the chemical storage tank 3 to pump the chemicals of the chemical storage tank 3 are provided. The outlet side of is connected to the rapid mixing tank 110 through a pipe that is supplied with cutting waste water and chemicals.

The slow mixing tank 120 is a mixing tank which is separated from the rapid mixing tank 110 by the partition wall 101, and the rapid mixing tank 110 and the slow mixing tank through the passage 103 formed in the partition wall 101. Internal spaces of the 120 are in communication with each other, and the mixed liquid of the cutting wastewater and the chemical passed through the rapid mixing tank 110 passes through the slow mixing tank 120, and then the mixed liquid discharge part 140 and the mixed liquid conveying pipe 150. Through the flotation device 200 is to be conveyed.

As shown in FIG. 3, the partition wall 101 has an open structure in which both side ends are not fixed to the inner side of the mixing tank, and thus the open portions of both side ends of the partition wall 101 are formed in the rapid mixing tank 110. Is a passage 103 for moving the mixed solution to the slow mixing tank 120.

More specifically, the partition 101 may be installed in a three-point fixing method on the inner surface of the mixing tank.

That is, approximately 1/2 upper portion of both side end portions of the partition wall 101 is formed by the inclined plate 102a spaced apart from the inner side of the mixing tank, and is opened to the passage 103, but both side ends of the partition wall below the open portion are mixed with the mixing tank. It is fixed to the inner side (fixed at two points), and the center portion is fixed to the bottom of the mixing tank at the bottom of the partition 101 (fixed at one point), but both sides of the central portion form an inclined plate 102b to open the passage.

The mixed liquid transfer pipe 150 is a pipe connected to the mixed liquid discharge portion 140 of the slow mixing tank 120, and is connected to the mixed liquid inlet portion 201 provided in the flotation separator 200.

The stirring apparatuses 131 and 132 are installed in the rapid mixing tank 110 and the slow mixing tank 120, respectively, and the stirrer 133 is formed by installing the impeller 135 on the shaft 134, and the stirrer. It comprises a drive motor 136 for rotationally driving the 133, in the preferred embodiment the stirrer 133 of each of the stirrer (131, 132) has an impeller 135 in the vertical position of the shaft 134, respectively It can be a stirrer of the structure of the two-stage impeller 135 installed.

The driving motor 136 is installed on the upper surface of the rapid mixing tank 110 and the slow mixing tank 120 or the upper cap 104 that can be opened or closed, or the rapid mixing tank 110 and the slow mixing tank ( 120) may be installed in a state supported by a separate support structure from the upper side.

In the mixing apparatus 100 having the above configuration, the cutting wastewater generated in the metal processing process and stored in the wastewater collection tank 1 is supplied to the rapid mixing tank 110 by the wastewater supply pump 2, and the chemical storage tank 3 is provided. The chemical stored in the medicine is supplied to the rapid mixing tank 110 by the chemical injection pump 4, the cutting wastewater and the chemical supplied to the rapid mixing tank 110 is a predetermined speed (relatively high speed, for example, 150rpm) Rapid stirring is performed by the stirring device 131 rotating in the furnace.

The rapid mixing tank 110 is a chemical treatment process, and the cutting waste water and chemicals are injected and rapidly stirred by using the stirring device 131 to neutralize the charge of the oil component and chemically condense the oil component. It will granulate and form a small oil floc.

At this time, the emulsion of the oil component (surface potential generation, the repulsive force acts between the oil components by the emulsion surrounding the oil component) of the rapidly stirred oil component is electrically neutralized while being destroyed by the injection of cationic chemicals (emulsion breaker), As the oil components condense by attraction between each other, fine granulation and fine oil floc formation proceed.

Then, after the mixed liquid of the wastewater-drug with the fine oil floc formed in the rapid mixing tank 110 is moved to the slow mixing tank 120 through the passage 103 of the partition 101, a predetermined speed (for example, By slow stirring using the stirring device 132 of the slow mixing tank 120 rotating at 60 rpm), the flocks generated in the rapid mixing tank are coagulated and grown to increase in size and large particles.

As described above, the mixed liquid (the mixed state of the wastewater and the chemical) in which the large oil floc is formed is floated through the mixed liquid discharge port 140 and the mixed liquid conveying pipe 150 connected to the slow mixing tank 120. 200).

At this time, the mixed liquid is transported by the forceless force by the level difference between the mixing device 100 and the flotation separation device 200, more specifically, the level difference between the slow mixing tank 120 of the mixing device and the separation tank 210 of the flotation device. You can do that.

As a chemical used in the rapid mixing tank 110 of the admixture 100 and used for condensation of oil components in cutting wastewater, a flocculant, such as a cationic surfactant, which is widely used in chemical treatment, is added to enhance cationicity. It is possible to use an organic flocculation flotation agent made based on poly-DADMAC (poly Diallyl Dimethyl Ammonium Chloride).

Next, the flotation separator 200 is connected to the micro-bubble injection pipes (303, 304) to which the micro-bubble is supplied from the micro-bubble supply device 300 so that the micro-bubbles are mixed in the mixed liquid transferred from the admixture device 100, And a separation tank 210 in which the oil floc in the mixed solution floats with the microbubbles while the mixed solution and the microbubbles are mixed, and separates and removes the oil floc floating by the microbubbles in the separation tank 210. At the same time, it is configured to temporarily store and collect and discharge the treated water from which the oil flocs have been removed.

That is, the flotation separator 200 receives the mixed liquid containing the oil floc from the mixing apparatus 100 (slow mixing tank) through the mixed liquid conveying tube 150 and receives the microbubble from the microbubble supply apparatus 300. Separation tank 210 receives the fine bubbles through the inlet pipe (303,304) and the oil flop rises by the microbubbles, and the solid-liquid separation is performed, and the oil floc in the mixed solution in the separation tank 210 is attached to the microbubbles. Floating collector 220 to remove and collect the injured oil floc from the mixed solution when the flotation, the sludge storage tank 230 is stored in a sludge state of the oil floc collected by the float collector 220, and the separation tank ( Treated water storage tank 240 in which the treated water from which the oil floc is removed at 210 is discharged and stored and discharged, and is connected to the treated water storage tank 240 to treat the treated water (pretreatment water, that is, waste water from which oil is separated). Wastewater treatment plant It is configured to include a processing Sui songgwan 246 to transfer to.

Here, the mixed liquid inlet 201 is provided in the lower portion of the separation tank 210 is connected to the mixed liquid transfer pipe 150, the treated water transfer pipe 246 is finally connected to the wastewater treatment plant, the treated water transfer pipe 246 During the process, a transfer pump 247 for sucking and pumping the treated water in the treated water storage tank 240 is installed, and the treated water in the treated water storage tank 240 is driven by the transfer pump 247 to the wastewater treatment plant. The final transfer can be made.

The treated water storage tank 240 may be configured by providing a space in one side of the separation tank 210, wherein the treatment water storage tank 240 is configured to be installed on the downstream side of the separation tank (210).

The treatment water storage tank 240 may be composed of an upper treatment water tank 241 having a treatment water discharge port 242 at a lower end thereof, and a lower storage tank 243 below the upper treatment water tank 241. The treated water collected first in the treated water tank 241 is discharged and stored in the lower storage tank 243 through the treated water outlet 242.

In this case, the treatment water transport pipe 246 is connected to the lower portion of the lower storage tank 243, and the treated water stored in the lower storage tank 243 is sent to the wastewater treatment plant by the transfer pump 247.

In addition, a partition wall 244 surrounding the treatment water storage tank 240 is installed downstream in the separation tank 210, and a lower portion of the partition wall 244 is disposed inside the partition tank 210 outside the partition wall and inside the partition wall. The passageway 245 for communicating the space surrounding the treated water storage 240 is formed.

Accordingly, the treated water introduced into the treatment water storage tank 240 surrounding space through the passage 245 in the separation tank 210 inside the partition 244 outside the partition 244 is moved to the upper upper treatment tank 241, and then is moved from the upper treatment tank (241) to the lower storage tank (243) and then discharged to the treated water transport pipe (246).

In addition, in a preferred embodiment, the mixed solution inlet 201 provided in the lower portion of the separation tank 210 to the microbubble inlet pipe 300 at the outlet side of the microbubble supply device 300 so that the mixed solution and the microbubbles are supplied in a mixed state ( 303 is connected.

In the microbubble supply device 300 as described below, a part of the treated water discharged from the separation tank 210 is recycled to inject air into the treated water to be recycled to make a state in which the microbubbles are mixed, and the microbubble is The mixed treated water is supplied through the micro bubble injection pipe 303.

Thus, when the treated water mixed with the microbubbles at the outlet side of the microbubble supply device 300 is discharged through the microbubble inlet tube 303, the treated water (hereinafter referred to as microbubble water) containing the microbubbles is mixed liquid inlet portion ( In 201), the mixture is supplied to the separation tank 210 in a mixed state with the mixed liquid discharged from the mixing device 100.

The mixed liquid inlet 201 is located outside the separation tank 210 is connected to the mixed liquid transfer pipe 150 and the micro-bubble injection pipe 303 of the mixed liquid and the micro-bubble injection pipe 303 of the mixed liquid transfer pipe 150 An injection port 202 into which the microbubble water is injected, and an injection body 203 which is located inside the separation tank 210 and connected to the injection port 202 and flows from the injection port 202 in a mixed state and the microbubble water. ), And the injection port 204 is formed in the injection body 203 at a predetermined interval and the mixed solution and the fine bubble water in the mixed state is ejected.

In addition, the separation vessel 210 is provided with a primary flotation plate 205 for guiding the mixed liquid and the oil floc, microbubbles, and recycled water discharged from the outlet 204 of the mixed liquid inlet unit 201 upwards, The primary float plate 205 is installed fixed to the bottom surface of the separation tank 210 in the inclined direction.

Accordingly, the mixed solution and recycle water may be transferred into the separation tank 210 through the mixed liquid inlet part 201 in a state in which the microbubbles are mixed, and the mixed liquid contains a large amount of oil floes generated by the mixing apparatus 100. As a result, the mixed liquid and the oil floc, the microbubbles, and the recirculating water are discharged through the spout 204 of the injection body 203 in the separation tank 210 and then moved upward by the primary float plate 205.

In particular, the microbubbles supplied in the state of being mixed with the recycle water serve to float the oil floc while attached to the oil floc in the mixed solution in the separation tank 210, and the oil floc with the microbubble is attached to the separation tank ( The liquid is separated from the solid while floating in 210 and then removed in the float collector 220 installed on the separation tank 210.

As described above, in the embodiment of the present invention, the mixed liquid inlet unit 201 introduces the mixed liquid and the fine bubble water together into the separation tank 210, and mixes the mixed liquid and the fine bubble water, and the efficiency of the oil floc and the fine bubbles is attached. A primary float plate 205 having a plurality of jet holes 204 along the longitudinal direction of the injection body 203 and capable of inducing a mixed solution and microbubble water upwards around the jet hole 204 to improve the Install.

Preferably, it is possible to directly inject the microbubble water discharged from the microbubble supply device 300 into the separation tank 210 through a separate additional path, for this purpose, the ejection pipe 206 in the lower portion of the separation tank 210. To install, the blow pipe 206 connects a separate micro bubble injection pipe 304 branched from the micro bubble injection pipe 303 of the micro bubble supply device 300.

The ejection pipe 206 is also provided with a plurality of ejection openings 207 along the longitudinal direction, the micro-bubble water is supplied through the branched micro-bubble injection pipe 304 in the micro-bubble supply device 300 to the ejection pipe ( 206 and the injection port 207 are injected into the lower portion of the separation tank 210.

In a preferred embodiment, a secondary floatation plate 208 is installed around the ejection opening 207 of the ejection pipe 206 to guide the fine bubble water ejected from the ejection opening upwards. Similarly to the upper plate 205, the separation tank 210 is fixedly installed in the inclined direction.

As a result, the microbubble water may be additionally injected into the separation tank 210 through the branched microbubble injection pipe 304 and the blowoff pipe 206, and the microbubbles mixed in the microbubble water are blown out from the spout 207. After being attached to the oil flocks (oil flocks lowered down) that has passed over the primary floatation plate 205, it moves upward along the secondary floatation plate 208.

The microbubble injected through the jet pipe 206 also serves to float the oil floc in a state in which it is attached to the oil floc in the separation tank 210, and thus separates the microbubble water through the separate path 210. By additionally supplying to the lower portion to increase along the secondary buoyancy plate 208 in the state that the micro-bubbles mixed therein attached to the oil floc can further increase the floating separation efficiency.

The float collector 220 is a device for removing the oil flotation floating by the micro-bubbles from the liquid level in the separation tank 210 to move to the sludge storage tank 230, and is widely used to remove the float or sludge floating on the liquid surface It may be a conventional float collector 220 or a skimmer device.

As an example, as shown in the upper portion of the separation tank 210, the driving motor 221, the driving roller 224, the support roller 225, the chain 226, the scraper 227 to the main configuration do.

The drive motor 221 is supported by the bracket 222 is installed on the upper side of the separation tank 210, as shown in Figure 5, the gearbox for transmitting a rotational force to the rotating shaft 228 of the drive motor 221 ( 223 is provided, the output shaft of the gear box 223 is integrally connected to the drive roller 224.

When the rotation shaft 228 of the drive motor 221 is driven to rotate the rotational force is transmitted to the gear box 223, the output shaft of the gear box 223 to rotate the drive roller 224, the drive roller 224 Rotational force is transmitted through the chain 226 to rotate the support roller 225.

The driving roller 224 and the support roller 225 are two rollers on both the left and right sides installed to be rotatable on both sides of the upper part of the separation tank 210, and a rotating shaft 228 connecting the two rollers on the left and right sides. And a sprocket 229 integrally installed on the two rollers on the left and right sides or the rotating shaft 228, and the sprocket 229 of the driving roller 224 and the sprocket 2 of the support roller 225. Between the 229 is a chain 226 for transmitting the rotational force is installed.

The sprocket 229 may be integrally installed at both ends of the rotating shaft 228 of the driving roller 224 and the support roller 225 or the two rollers on both the left and right sides, and the chain 226 may also be installed at the left and right sides, respectively. In addition, the chain 226 is provided with a long scraper 227 to cross the left and right transverse direction of the separation tank (210).

In the float collector 220 having the above-described configuration, when the driving roller 224 and the supporting roller 225 that receive the rotational force of the driving motor 221 rotate, and the chain 226 therebetween moves, the scraper installed in the chain ( 227 is moved to kick the oil flotation floating on the separation tank (210).

The sludge storage tank 230 is provided at the rear end of the float collector 220 toward one side in the separation tank 210, and may be installed to have a predetermined internal space below the driving roller 224 as illustrated.

As a result, when the scraper 227 is moved from the support roller 225 to the driving roller 224, the oil flux on the upper surface of the liquid is rolled up and moved to the rear end where the sludge storage tank 230 is located, and the oil flop that has reached the rear end side. Is temporarily stored apart from the sludge storage (230).

Sludge discharge port 231 is provided at the lower end of the sludge storage tank 230, although not shown in the drawing, the sludge discharge pipe 231 may be installed to extend to the outside, the sludge discharge port 231 or sludge A valve can be installed in the middle of the discharge pipe.

When the sludge is filled in the sludge storage tank 230 more than a predetermined amount, the sludge of the sludge storage tank 230 is discharged to the outside through the sludge discharge port 231 and the sludge discharge pipe by opening the valve.

In addition, in order to facilitate the external discharge of the sludge from the sludge storage tank 230, it is possible to provide a suction device on the outside of the flotation separator 200 and then connect the sludge discharge pipe to the suction device, in this case suction When driving the device, the sludge in the sludge storage tank 230 through the sludge discharge pipe can be drawn out while being sucked, it is possible to easily discharge the sludge of the sludge storage tank 230.

Next, the microbubble supply device 300 is configured to inject air into the treated water discharged from the treated water storage tank 240 to generate a microbubble in a mixed state in the treated water and then supply it to the separation tank 210. As a part, the recycle pipe 301 for recycling the treated water discharged from the treated water storage tank 240 and the treated water discharged from the treated water storage tank 240 is installed in the middle of the recycle pipe 301 to recycle the treated water. A recirculation pump 310 suctioned and pumped through a pipe 301, an air inlet 302 installed at a recirculation pipe 301 upstream of the recirculation pump 310, and into which external air is introduced, and the recirculation pipe ( 301) installed on the downstream side and the microbubble generator 320 to make the air mixed in the form of microbubbles in the treated water while conveying the treated water (recycled water) and the air introduced through the air inlet 302 together; , Exit of the microbubble generator 320 Is installed in the connection side is configured to include the micropores pimp admission (303 304) for supplying a number of the micro-bubble forming process (recycle number), that is, remove the micropores catcher tank (210).

Here, a method of recycling some of the treated water discharged from the treated water storage tank 240 and flowing along the treated water transport pipe 246 is preferred, and for this purpose, the recycled pipe 301 is discharged from the treated water transport pipe 246. It is branched and installed.

Accordingly, some of the treated water, that is, the recycle water is sucked into the recycle pipe 301 from the treated water transfer pipe 246 by the suction force of the recycle pump 310 and is supplied to the microbubble generator 320.

The microbubble generator 320 is a component that generates microbubbles in the treated water, that is, a component that makes air injected into the treated water into a microbubble shape, and flow rate fluctuations for each section of the flow path through which the treated water passes with air. It may be configured to include a micro-bubble generating tube 322 of the structure to repeat the increase and decrease according to the section so that the cross-sectional area of the passage.

As an example, as shown in FIG. 6, the microbubble generator 320 may be configured by installing a microbubble generating tube 322 in the chamber 321 having a structure in which an inner diameter is varied for each lengthwise section. At this time, the microbubble generating tube 322 has a structure in which the inner diameter is repeatedly increased or decreased according to the section.

In addition, the micro-bubble generating tube 322 is preferably provided in a spiral wound structure.

Reference numeral 323 denotes a pressure gauge for checking internal pressure.

In the microbubble generating tube 322, the microbubble is generated using the Bernoulli principle that "the sum of all forms of energy on the streamline is always constant with respect to the flowing fluid."

When the treated water (recycled water) recycled by the recirculation pump 310 flows into the microbubble generator 320 together with the air introduced through the air inlet 302, thereafter, while passing through the inside of the microbubble generator tube 322. The pressure is repeatedly changed. At this time, the treated water and the air are pressurized together to convert the mixed water into the supersaturated state, that is, the microbubble water.

In particular, in the course of passing through the long wound microbubble tube 322, the flow velocity was increased (pressure drop) and slowed down (pressure rise) to generate microbubbles in the treated water, and such microbubbles are finally separated. Bars are discharged into the tank 210, through the blow pipe 206 in the separation tank 210 may be discharged to the micro-bubbles having a diameter of about 30 ~ 60 ㎛.

Thus, the configuration of the cutting waste water oil separation apparatus according to the present invention has been described, Figure 7 is a view showing the principle of oil separation using micro-bubbles in the present invention, it will be described as follows.

Basically, in the rapid mixing tank 110, when the cutting wastewater and chemicals are supplied and rapidly stirred by the stirring device 131, the oil component in the wastewater condenses to form a fine floc.

In particular, the chemicals break down the emulsion and the electrically neutralized oil components are granulated as they condense with each other by attraction, and these particles continue to aggregate and grow into flocs.

Then, when the mixed liquid of the wastewater and the chemicals moved into the slow mixing tank 120 is slowly stirred by the stirring device 132, the fine oil flocs in the mixed liquid are installed in the larger flocks due to agglomeration, and then discharged together with the mixed liquid. Are moved to the separation tank (210).

In the separation tank 210, the oil flocks are floated by the addition of agglomeration and microbubbles, and the microbubbles introduced by the microbubble supply device 300 are attached to the enlarged oil flocs and the oil flocks are lifted by the microbubbles. This will result in a solid-liquid separation.

Then, the flocculated oil flocks are collected by the float collector 220 and stored in the sludge storage tank 230, and the treated water from which the oil flocs are removed is moved to the treated water storage tank 240 and then the treated water transfer pipe. 246 is sent to the wastewater treatment plant.

In addition, a portion of the treated water in the treated water storage tank 240 is moved to the microbubble supply device 300, in the microbubble supply device 300 as the air introduced into the treated water melts fine bubbles are generated in the treated water Bars, thus, the microbubbles mixed in the treated water are discharged into the separation tank 210 and used to float the oil flocs.

8 is a view showing the floating principle of the solids using the micro-bubble, the micro-bubble has the features and advantages shown in Figure 8, when using the micro-bubbles, it is possible to lift and remove the fine suspended matter, the removal of organic contaminants. .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modified forms are also included within the scope of the present invention.

1: wastewater collection tank 2: wastewater supply pump
3: chemical storage tank 4: chemical injection pump
100: admixture 101: bulkhead
102a, 102b: Inclined plate 103: Pathway
110: rapid mixing tank 120: slow mixing tank
131, 132: agitator 133: agitator
134: axis 135: impeller
136: drive motor 140: mixed liquid discharge port
150: mixed liquid transfer pipe 200: flotation separator
201: mixed liquid inlet 202: injection port
203: injection body 204: spout
205: primary float plate 206: spout pipe
207: spout 208: secondary float plate
210: separation tank 220: floating water collector
221: drive motor 222: bracket
223: gear box 224: drive roller
225: support roller 226: chain
227: scraper 228: rotation axis
229: sprocket 230: sludge storage tank
231: sludge outlet 240: treated water storage tank
241: upper treatment tank 242: treatment water outlet
243: lower storage 244: bulkhead
245 passageway 246 treated water transport pipe
247: transfer pump 300: fine bubble supply device
301: recirculation piping 303, 304: fine bubble injection pipe
310: recirculation pump 302: air inlet
320: fine bubble generator 321: chamber
322: microbubble generating tube 323: pressure gauge

Claims (15)

A device for separating and removing oil components before being sent to the wastewater treatment plant, which is used in the metal processing process and is discarded at the end of its life.
A mixing device (100) for supplying and cutting cutting waste water and chemicals and condensing oil components in the cutting waste water with chemicals to form an oil floc;
A fine bubble is supplied to the mixed solution of the cutting wastewater and the chemical discharged from the admixture device 100, so that the oil floc in the mixed solution floats with the fine bubbles attached, and the floated oil floc is installed thereon. A flotation device 200 which is removed and collected by the 220 and simultaneously transfers the treated water from which the oil flocs have been removed to a wastewater treatment plant;
A microbubble supply device 300 for generating microbubbles and providing them to the flotation separator 200;
Cutting waste oil oil separation apparatus using a micro-bubble comprising a.
The method according to claim 1,
The mixing device 100,
A rapid mixing tank 110 in which cutting wastewater and chemicals are supplied and an oil floc is generated by condensation of oil components in the cutting wastewater by the chemicals during stirring;
A slow mixing tank 120 in which the oil mixture is agglomerated and enlarged when the mixed solution of the cutting wastewater and the chemical is supplied from the rapid mixing tank 110;
Stirring devices (131, 132) installed in the rapid mixing tank (110) and the slow mixing tank (120), respectively, to stir the cutting waste water and the chemicals;
A mixed liquid discharge part 140 provided in the slow mixing tank 120 for discharging the wastewater-drug mixed liquid containing an oil floc;
A mixed liquid conveying pipe 150 connected to the floating liquid separating unit 200 from the mixed liquid discharge part 140 to transfer the wastewater-drug mixed liquid discharged from the slow mixing tank 120 to the floating separating device 200;
Cutting waste water oil separation apparatus using a micro-bubble comprising a.
The method according to claim 1,
The flotation separator 200,
The mixed solution of the wastewater-drug containing the oil floc is supplied from the admixture apparatus 100 through the mixed liquid transfer pipe 150, and the microbubbles are supplied from the microbubble supply apparatus 300 through the microbubble injection tube 303. A separation tank 210 to which the oil floc is supplied and floated by the micro-bubbles to separate the solid-liquid;
A float collector 220 for removing and collecting the flotation of the oil in the separation tank 210;
A sludge storage tank 230 in which oil flocs collected by the float collector 220 are stored;
A treated water storage tank 240 into which the treated water from which the oil plug is removed from the separating tank 210 is introduced and discharged;
A treatment water transport pipe 246 connected to the treatment water storage tank 240 to transfer the treatment water to a wastewater treatment plant;
Cutting waste water oil separation apparatus using micro-bubbles, characterized in that comprising a.
The method according to claim 3,
Cutting wastewater oil separation apparatus using microbubbles, characterized in that the transfer pump 247 for suctioning and pumping the treated water in the treated water storage tank 240 is installed in the middle of the treated water transport pipe (246).
The method according to claim 3,
The treated water transport pipe 246 is provided downstream in the separation tank 210,
The partition wall 244 surrounding the treated water storage tank 240 is installed in the separation tank 210,
A passage 245 is formed below the partition wall 244 to communicate the inner space of the separation tank outside the partition wall and the space surrounding the treated water storage tank inside the partition wall.
The treated water flowing into the treatment water storage peripheral space inside the partition 244 through the passage 245 of the partition in the separation tank 210 outside the partition 244 moves upwards and then the treated water Cutting waste water oil separation apparatus using micro-bubbles, characterized in that the storage tank 240 is introduced.
The method according to claim 1, 2 or 3,
The mixed liquid conveying pipe 150 for transferring the wastewater-drug mixed liquid containing the oil flocs from the mixing device 100 is connected to the mixed liquid inlet portion 201 of the separation flotation device,
The microbubble inlet pipe 303 through which the microbubble is supplied from the microbubble supply device 300 is connected to the mixed liquid inlet part 201,
Cutting using the micro-bubbles, characterized in that the waste water-drug mixture solution supplied from the admixture device 100 and the microbubble supplied from the microbubble supply device 300 is supplied to the flotation separator 200 in a mixed state. Wastewater oil separator.
The method of claim 6,
The mixed liquid inlet portion 201,
An injection port 202 to which the mixed liquid transport pipe 150 and the micro bubble injection pipe 303 are connected to mix the waste water-drug mixed liquid and the micro bubbles after injection;
An injection body 203 positioned in the separation tank 210 in the separation flotation apparatus and connected to the injection port 202 and introduced from the injection port in a state in which the waste water-drug mixture liquid and the microbubble are mixed;
A discharge port 204 formed at the injection body 203 at predetermined intervals to discharge the wastewater-drug mixture solution and the microbubbles in a mixed state;
Cutting waste water oil separation apparatus using micro-bubbles, characterized in that comprising a.
The method according to claim 7,
In the separation tank 210 is located around the spout 204, the primary float plate 205 is installed to guide the waste water-drug mixture and the micro-bubble discharged from the spout 204 upwards Cutting waste oil separation device using fine bubbles.
The method of claim 6,
A separate microbubble injection tube 304 branched from the microbubble injection tube 303 is additionally connected to the flotation separator 200, and the branched microbubble injection tube 304 is separated from the flotation separator 200. It is connected to the discharge pipe 206 is installed in the lower portion of the separation tank 210, the jet pipe 206 is provided with a jet port 207 at a predetermined interval, the micro-bubble supplied from the micro bubble supply device 300 Cutting waste water oil separation apparatus using a micro-bubble, characterized in that the additional supply through the jet pipe 206 and the jet port (207).
The method according to claim 9,
The secondary floatation plate 208 is installed in the separation tank 210 to be positioned around the ejection opening 207 of the ejection pipe 206 to guide the fine bubbles ejected from the ejection opening 207 upwards. Cutting waste oil oil separation device using fine bubbles.
The method according to claim 1,
The microbubble supply device 300 recycles a portion of the treated water discharged from the flotation separator 200 to provide the flocculation separator 200 in a state in which the microbubbles are mixed with the recycled treated water. Cutting waste oil oil separation apparatus using a micro-bubble characterized in that.
The method of claim 11,
The microbubble supply device 300,
A recirculation pipe 301 for recirculating the treated water discharged from the flotation device 200;
A recirculation pump 310 installed in the middle of the recirculation pipe 301 to pump and process the treated water through the recirculation pipe 301;
An air inlet 302 installed in the recirculation pipe 301 upstream of the recirculation pump 310 to introduce external air;
A microbubble generator (320) installed on the downstream side of the recirculation pipe (301) and mixing and mixing the air in the treated water into a microbubble shape while transferring the treated water and the air introduced through the air inlet 302 together;
Microbubble injection pipes 303 and 304 connected to the microbubble generator 320 at the outlet to provide the treated water mixed with microbubbles to the flotation separator 200;
Cutting waste water oil separation apparatus using micro-bubbles, characterized in that comprising a.
The method of claim 12,
The microbubble generator 320 includes a microbubble generating tube 322 having a structure in which the cross-sectional area of the flow path is increased or decreased so that flow rate fluctuation occurs in each section of the flow path through which the treated water passes along with air. Cutting waste oil separation device using fine bubbles.
The method according to claim 13,
Cutting wastewater oil separation apparatus using a micro-bubble, characterized in that the inner diameter of the microbubble generating tube 322 repeats the increase and decrease for each section in the longitudinal direction.
The method according to claim 13 or 14,
The microbubble piping is a cutting waste oil separation apparatus using micro-bubbles, characterized in that the spirally wound structure.

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