JP2004034013A - Method and apparatus for separating oil from drainage produced from compressed air - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of an oil separating apparatus constituted by stacking several sets of oil adsorbing layers and several emulsion breaking layers alternately so that the thickness of each of the emulsion breaking layers is made thin in order to keep the balance between the resistance of an emulsion breaking material and that of an oil adsorbing material since the former has stronger rersistance than the latter in matching with the resistance when drainage is made to flow through this apparatus, while it is necessary to thicken each of the emulsion breaking layers when dirty drainage is treated, and the balance can not be kept due to the resistance when the drainage is made to flow, when the emulsion breaking layers are extremely thickened. <P>SOLUTION: A high-concentration air dissolving liquid is spouted into the drainage when the oil contained in the drainage is separated by a specific gravity difference so that the foreign matter contained in the drainage is stuck to the surfaces of minute air bubbles produced by the spouting. The foreign matter floating on the water surface is removed together with the oil. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil-water separation method and an oil-water separation device for drain water generated from compressed air. More specifically, the present invention relates to a method of separating drain water and oil in which minute oil is combined with water to emulsify drain water. The present invention relates to a technique for causing an emulsion to be broken to release a bond.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a technique related to an oil-water separation method and an oil-water separation apparatus for drain water generated from compressed air, there have been many techniques for separating oil lighter than water and foreign substances heavier than water from dirty drain water.
[0003]
In addition, there were filters, oil adsorbents, electrolysis, and chemicals.
[0004]
Further, as a technique using an oil adsorbent with emulsion-breaking particles, as disclosed in Japanese Patent Application Laid-Open No. Sho 54-6352, an amine or the like is treated with a treatment material having adhered to a support, and wastewater is treated. A method of separating oil and water by performing a two-stage treatment such as treatment with an oil adsorbent such as polypropylene after coarsening or breaking emulsion particles has been disclosed.
[0005]
Further, as another technique using an oil adsorbent with emulsion-breaking particles, as disclosed in Japanese Patent Application Laid-Open No. 2001-113269, an oil adsorbent layer composed of an oil adsorbent having a relatively low hydrophilicity and an emulsion treatment are disclosed. There is disclosed an oil-water separator in which a plurality of sets of materials or an emulsion decomposition layer made of an oil adsorbent having relatively high hydrophilicity are alternately laminated.
[0006]
[Problems to be solved by the invention]
However, such conventional methods for separating oil and water of drain water generated from compressed air have the following problems.
[0007]
First, the separation of oil from the emulsified drain water, where minute oil is combined with water, is based on the difference in specific gravity between water and oil or foreign matter, using a filter, or using an oil adsorbent. With such a simple device, it was almost impossible. In addition, clogging due to foreign matter is quick, and maintenance at that time is complicated.
[0008]
Second, electrolysis and chemicals required more completeness, requiring larger equipment and higher costs.
[0009]
Thirdly, if these methods are combined to form an oil / water separation device, the processing capacity including emulsion destruction will be improved, but the size of the device tends to be large and the cost tends to be high, creating an efficient device. Had a hard time.
[0010]
Fourth, in the two-stage treatment of emulsion destruction and oil adsorption shown in Japanese Patent Application Laid-Open Publication No. 54-6352, a specific flow is selected by selecting a flow path through which drain water easily flows during oil adsorption treatment. In many cases, it was necessary to replace the adsorbent at an early stage through only the adsorbent of the portion. In addition, since the processing material for emulsion destruction has a higher resistance than the oil adsorbent, the capacity of the processing material for emulsion destruction was reduced to balance the two, but on the other hand, for the heavily soiled drain water, However, it is necessary to increase the capacity of the processing material for emulsion destruction. If the capacity is to be extremely increased, there is a problem in that when drain water flows, the resistance is not balanced.
[0011]
Fifth, in the oil-water separation apparatus disclosed in Japanese Patent Application Laid-Open Publication No. 2001-113269 in which a plurality of sets of the oil adsorbing layer and the emulsion decomposing layer are alternately stacked, the treatment material for breaking the emulsion is more resistant than the oil adsorbing material. Therefore, the thickness of the emulsion decomposition layer was reduced in order to balance the two according to the resistance when flowing.On the other hand, the thickness of the emulsion decomposition layer was reduced for highly contaminated drain water. It is necessary to increase the thickness, and when trying to make it extremely thick, there is a problem that the drain water flows out of balance in terms of resistance.
The present invention aims to solve such a problem.
[0012]
[Means for Solving the Problems]
According to the present invention, a foreign substance contained in drain water is attached to the surface of fine bubbles that appear by releasing a high concentration air solution while separating oil contained in drain water due to a specific gravity difference. It is characterized in that foreign substances floating on the water surface are removed together with the oil thereby, and further, oil and solidified foreign substances are removed again from the drain water in which the foreign substances floating on the water surface have been removed together with the oil, and then the oil emulsified By adsorbing, and furthermore, by applying a magnetic force to the drain water in which foreign substances floating on the water surface have been removed together with the oil, and then adsorbing the emulsified oil, The above problem has been solved.
[0013]
The present invention also provides an oil / water separation tank 10 for separating oil contained in drain water according to a difference in specific gravity, and creates fine bubbles in the oil / water separation tank 10 to adhere foreign matters contained in drain water to the surface thereof, thereby A vortex pump 310 that sucks air and drain water to mix, agitate and pressurize air and drain water in order to send out a high-concentration air solution to the oil-water separation tank 10 for the purpose of removing foreign substances floating on the water surface together with oil; A separation tank 320 configured to separate large bubbles downstream of the vortex pump 310. The oil separation and adsorption tank 40 separates oil contained in drain water by a specific gravity difference. A high-concentration air is produced for the purpose of creating fine bubbles in the separation / adsorption tank 40 and attaching foreign matter contained in drain water to the surface thereof, thereby removing foreign matter floating on the water surface together with oil. A vortex pump 310 that sucks air and drain water to send the solution to the oil separation / adsorption tank 40 and performs mixing, stirring, and pressurization; a separation tank 320 that separates large bubbles downstream of the vortex pump 310; The oil separating and adsorbing tank 40 comprises oil adsorbing materials 42a and 42b for adsorbing oil. Further, the oil separating and adsorbing tank 40 separates oil contained in drain water by a difference in specific gravity. An oil / water separation tank 41u, a suction pipe 41i for sucking drain water and a discharge pipe 41h for sending out a high-concentration air solution, and a first oil adsorption tank 41v containing the oil adsorbent 42a; An inlet pipe 41a, 41b, which forms a second oil adsorption tank 41w accommodating 42b and sends drain water from the bottom part to drain water from the tanks 41u, 41v, 41w and flows out at the position of the water surface, 1c is disposed in the tanks 41u, 41v, 41w, and further, a foreign matter capturing tank 20 for removing oil and solidified foreign matter downstream of the oil-water separation tank 10 or the oil separation and adsorption tank 40. Alternatively, an activated carbon storage tank 60 and an emulsion-breaking oil adsorption tank 30 for adsorbing emulsified oil are arranged in the stated order, and furthermore, the oil-water separation tank 10 or the oil separation / adsorption tank 40 is provided downstream. A magnet 50 for generating a magnetic force and an emulsion-breaking oil adsorption tank 30 for adsorbing the emulsified oil are arranged in the stated order, and the oil-water separation tank 10 or the oil separation / adsorption tank 40 A drain trap 266 that collectively discharges all drain water flowing from the devices 120, 130, 140, and 150 that generates drain water is provided upstream. By doing so, the above problem was solved.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An oil-water separation method and an oil-water separation device for drain water generated from compressed air according to the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a diagram showing the relationship between the whole showing the flow of the compressed air and the drain water and the first oil-water separator of the present invention, and FIG. 2 shows the flow of the compressed air and the drain water. FIG. 3 is a diagram showing the relationship between the whole and the second oil / water separator of the present invention, and FIG. 3 shows the relationship between the whole showing the flow of compressed air and drain water and the third oil / water separator of the present invention. FIG. 4 is a diagram showing the relationship between the whole showing the flow of compressed air and drain water and the fourth oil / water separator of the present invention, and FIG. 5 is a diagram showing the third and fourth oil / water separators. FIG. 3 is a detailed view of an oil separation / adsorption tank related to the separation device.
[0015]
(First embodiment)
As shown in FIG. 1, reference numeral 110 denotes an air compressor, which is not specifically shown, is composed of a motor and a compressor, and transmits the rotation of the motor to the compressor to take in compressed air while taking in the atmosphere. Was producing.
[0016]
Here, the compressed air generated by the air compressor 110 is supplied to a compressed air pipe 201, an aftercooler 120 for cooling the compressed air, a compressed air pipe 202, an air tank 130 for storing the compressed air, and a compressed air pipe 203. A dryer 140 for drying the compressed air, a compressed air pipe 204, a filter 150 for removing various foreign substances such as oil and dust from the compressed air, and an air motor, an air cylinder, and the like via the compressed air pipe 205. And dry compressed air can be supplied to various types of pneumatic devices constituting the above actuator.
[0017]
On the other hand, a drain discharge pipe 211a for discharging drain water, a valve 221 that can be manually opened and closed, a drain discharge pipe 211b, and a drain discharge pipe 211b from the aftercooler 120, which is a device that generates drain water, are opened and closed by a motor operation or magnetic force. Via an electrically operated drain trap 222 for performing operation and discharging drain water together with compressed air, a drain discharge pipe 211c, a check valve 223 for preventing drain water from flowing backward from downstream to upstream, and via a drain discharge pipe 211d. And is connected to the collecting pipe 261.
[0018]
Also, a drain discharge pipe 212a for discharging drain water, a valve 231 that can be manually opened / closed, a drain discharge pipe 212b, a drain discharge pipe 212b, and a motor operated or magnetically driven from the lower part of the air tank 130, which is a device that generates drain water. A motor-operated drain trap 232 that opens and closes and discharges drain water together with compressed air; a drain discharge pipe 212c; a check valve 233 for preventing drain water from flowing backward from downstream to upstream; and a drain discharge pipe 212d. , And is connected to the most upstream of the collecting pipe 261.
[0019]
Further, from the dryer 140, which is a device that generates drain water, a drain discharge pipe 213a for discharging drain water, a valve 241 that can be manually opened and closed, a drain discharge pipe 213b, and an opening and closing operation by a motor operation or magnetic force. , An electric drain trap 242 for discharging drain water together with compressed air, a drain discharge pipe 213c, a check valve 243 for preventing drain water from flowing backward from downstream to upstream, and a drain discharge pipe 213d. And is connected to the collecting pipe 261.
[0020]
In addition, a drain discharge pipe 214a for discharging drain water, a valve 251 that can be manually opened and closed, a drain discharge pipe 214b, and a filter 150 that is a device that generates drain water are opened and closed by a motor operation or magnetic force. Via an electrically operated drain trap 252 that operates and discharges drain water together with compressed air, a drain discharge pipe 214c, a check valve 253 that prevents drain water from flowing backward from downstream to upstream, and via a drain discharge pipe 214d. And is connected to the collecting pipe 261.
[0021]
The drain water in the drain traps 222, 232, 242, and 252 is always discharged for a predetermined time in a predetermined cycle, or as another method, always in a predetermined cycle. , 252 may be performed for a predetermined time only when the presence / absence of drain water is confirmed and the presence of drain water is confirmed. At this time, immediately after the drain water is drained, if the presence of the drain water is further confirmed, the drain water may be discharged for a further predetermined time.
[0022]
Here, the collecting pipe 261 is provided with a check valve 265 for preventing the drain water from flowing backward from the downstream to the upstream, the collecting pipe 262, and the oil-water separator 1A for separating various foreign substances such as oil and dust of the present invention. The fresh water can be discharged from the fresh water pipe 274 via the. The fresh water discharged from the fresh water pipe 274 is so clean that it can be discharged to a river or the like without any change.
[0023]
In this case, the oil-water separation device 1A includes an oil-water separation tank 10, a foreign matter trapping tank 20, and an emulsion-breaking oil adsorption tank 30. A connection pipe 271 and drain water are provided between the oil-water separation tank 10 and the foreign matter trapping tank 20. A check valve 275 for preventing backflow from downstream to upstream is connected to a connection pipe 272, and a connection pipe 273 is connected between the foreign matter capturing tank 20 and the emulsion breaking oil adsorption tank 30.
[0024]
However, the foreign matter capturing tank 20 and the emulsion breaking oil absorbing tank 30 need not be limited to one each, and may be two, three, or more. In such a case, the foreign matter trapping tank 20 and the emulsion breaking oil adsorption tank 30 which are arranged in series one by one may be configured in parallel, It is also conceivable that a configuration in which a plurality of 30s are configured in parallel is configured in series.
[0025]
By the way, the oil-water separation tank 10 forms two chambers of the oil-floating separation chamber 11x and the water storage chamber 11y by partitioning the oil-water separation tank main body 11 by the partition 11d, and seals the inside of the oil-water separation tank main body 11, In the upper part, only the compressed air, which is a gas, can freely enter and exit between the oil flotation separation chamber 11x and the water storage chamber 11y at a part higher than the liquid level, and in the lower part, the drain water, which is the liquid, is at the tip of the partition wall 11d. Between the oil floating separation chamber 11x and the water storage chamber 11y between the oil storage tank 11y and the bottom of the oil / water separation tank main body 11.
[0026]
The suction pipe 11b, which protrudes from the liquid level above the oil flotation separation chamber 11x and whose one end is connected to the collecting pipe 262, is located at the other end of the suction pipe 11b so that drain water flows therein. I have. Therefore, in the oil floating separation chamber 11x, oil lighter than water floats on the liquid surface, and foreign substances heavier than water settle on the bottom. In this case, the oil floating on the liquid surface can be discharged by opening the floating oil discharge valve 13.
[0027]
On the other hand, in the water storage chamber 11y, one end of the discharge pipe 11c is positioned on the liquid surface, and the tip of the lower partition 11d between the oil floating separation chamber 11x and the water storage chamber 11y and the bottom of the oil / water separation tank main body 11 Drain water from which oil lighter than water and foreign matter heavier than water is removed from the portion communicating with the drain water flows in. However, the emulsified oil dissolved in the drain water and could not be separated by such a method and flowed as it was.
[0028]
Here, the other pipe end of the discharge pipe 11c is connected to the connection pipe 271. Therefore, the relatively clean drain water, which is located above one end of the discharge pipe 11c collected on the liquid level of the water storage chamber 11y and is free of oil, is located above the oil floating separation chamber 11x and the upper part of the water storage chamber 11y. The discharge pipe 11c enters from one pipe end and is sent to the connection pipe 271 together with the compressed air from the other pipe end by the pressure of the compressed air which is sealed in communication with the discharge pipe 11c. In order to control the pressure of the compressed air in the upper part of the oil floating separation chamber 11x and the upper part of the water storage chamber 11y, a pressure gauge 12 is provided on the upper part of the main body 11 of the oil / water separation tank.
[0029]
As shown in FIG. 1, a transparent transparent tube 11 a is disposed on the outer periphery of the oil / water separation tank main body 11 in a vertical direction and communicates with the oil / water separation tank main body 11 at four points including the upper end and the lower end. Is formed. In this case, the purpose of the transparent tube 11a is to check the state of the drain water contamination of the oil floating separation chamber 11x immediately after flowing into the oil floating separation chamber 11x by visual or optical means. Therefore, as a material of the transparent tube 11a, a transparent material such as glass or plastic can be considered.
[0030]
The number of communicating points between the transparent pipe 11a and the oil / water separation tank main body 11 is not limited to four, but may be two, three, five, or more. Further, as a means for confirming the degree of contamination, an optical method of irradiating light and making a determination based on transmitted light or reflected light can be considered.
[0031]
The oil / water separation tank main body 11 constituting the oil / water separation tank 10 is also provided with a suction pipe 11f and a discharge pipe 11e. Then, between the suction pipe 11f and the discharge pipe 11e, fine air bubbles are created in the suction pipe 351 and the water separation tank 10, and foreign matters contained in the drain water adhere to the surface thereof, thereby removing foreign matters floating on the water surface. In order to send a high concentration air solution to the oil / water separation tank 10 for the purpose of removing with oil, drain water is connected to the suction pipe 351 and air is connected to the drain water, and air is suctioned from the air suction pipe 315 to mix, agitate and pressurize. The vortex pump 310 to be performed, the high concentration air solution pipe 352, the separation tank 320 for separating large bubbles downstream of the vortex pump 310, and the high concentration air solution pipe 353 are connected in the stated order.
[0032]
Next, the foreign matter trapping tank 20 includes a foreign matter trapping tank main body 21, a filter element 22, and pressure gauges 23 and 24. In this case, the foreign matter trapping tank main body 21 is configured in a hermetically sealed state by a main body part and a lid part, and an inflow passage 21a and an outflow passage 21b are formed in the lid part of the foreign matter trapping tank main body 21. Are connected to pressure gauges 23 and 24.
[0033]
In this case, the pressure of the pressure gauges 23 and 24 is set to any value of 0.01 to 0.7 MPa together with the pressure of the pressure gauge 12 of the oil / water separation tank 10. However, the pressure loss due to the connection pipes 271, 272 between the pressure gauges 12, 23, 24 needs to be considered somewhat. Here, if the set pressure is too low, the drain water cannot be discharged as fresh water through the oil / water separator 1A. If the set pressure is too high, the drain water constitutes the oil / water separator 1A. However, there will be a problem that a specific flow path is formed when passing through the emulsion breaking oil adsorption tank 30, which will be described later.
[0034]
Further, the filter element 22 is housed inside the main body part of the foreign matter trapping tank main body 21 and is fixed by the lid part of the foreign matter trapping tank main body 21. Therefore, the drain water from the oil / water separation tank 10 flowing into the foreign matter capturing tank 20 is always discharged from the foreign matter capturing tank 20 via the filter element 22 from outside to inside. In addition, when the drain water passes through the filter element 22, a part of the emulsified oil breaks the emulsion to release the bond between the water and the oil. Here, the two pressure gauges 23 and 24 determine the replacement time of the filter element 22 based on the pressure difference. However, the foreign matter capturing tank 20 may not be installed.
[0035]
Further, in the emulsion-breaking oil adsorption tank 30, an activated carbon 34 for removing dyes and unpleasant odors is disposed in the emulsion-breaking oil adsorption tank main body 31 so as to block the flow of the drain water over substantially the entire cross section at the center. A mixture of an oil adsorbent 32 with emulsion destruction particles to which emulsion destruction particles are adhered and an oil adsorbent 33 for adsorbing oil are mixed almost uniformly, and are stored before and after activated carbon 34. is there.
[0036]
Here, the emulsion destruction oil absorption tank main body 31 is made of a transparent material such as glass or plastic from which the internal state can be viewed from the outside, or made of glass or the like so that the internal state can be viewed from the outside. It is also conceivable to insert a transparent material such as plastic.
[0037]
In this case, the oil adsorbent 32 with emulsion-breaking particles releases the bond between oil and water by breaking the emulsified drain water by the action of the minute oil combined with water by the action of the emulsion-breaking particles. The oil thus absorbed is adsorbed by the oil adsorbent and the oil adsorbent 33 constituting the oil adsorbent 32 with emulsion-breaking oil particles.
Therefore, the oil adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33 are scattered, so that the oil can be removed by completely separating and adsorbing the oil from the emulsified oil.
[0038]
On the other hand, the granular activated carbon 34 is intended to adsorb and remove pigments and off-flavors. As for the position where the activated carbon 34 is filled in the emulsion breaking oil adsorption tank 30, the activated carbon 34 is contaminated quickly in the uppermost stream, and the activated carbon 34 itself flows out in the lowermost stream, so that the contaminated water appears to flow. For this reason, it is desirable to be located at a substantially central portion.
[0039]
Here, the structure of the emulsion breaking oil adsorption tank main body 31 is such that while drain water as a liquid flows into the emulsion breaking oil adsorption tank main body 31 from the inflow port and discharges from the outflow port, Spaces 31z are secured at the inlet side and the outlet side which are both ends of the emulsion breaking oil adsorption tank main body 31 so as to flow uniformly in the inside 31.
[0040]
Therefore, in order to secure the spaces 31z at both ends, two perforated plates 31c having a large number of small holes are prepared, and the perforated plates 31c and the ends at both ends of the emulsion-breaking oil adsorption tank main body 31 are prepared. A perforated plate 31c is supported by disposing a cylindrical column 31d having a smaller diameter than the emulsion-breaking oil adsorption tank main body 31 therebetween, and the oil adsorbent 32 with emulsion breaking particles, the oil adsorbent 33, and the activated carbon 34 are divided into two porous It is stored between the plates 31c. However, the support 31d need not be limited to a cylindrical one at all, and may have any shape as long as the space 31z can be secured. In addition, as the porous plate 31c, a punching plate in which many small holes are formed, a ceramic resin, or the like can be considered.
[0041]
Further, the oil adsorbent 32 and the oil adsorbent 33 with the emulsion destruction particles increase in resistance as they absorb foreign substances such as oil, and are pressed further downstream while being compressed. The function of oil destruction and oil absorption is reduced.
[0042]
Therefore, in order to prevent this even a little, an intermediate porous plate 31e having a number of small holes formed in the approximate center of the emulsion breaking oil adsorption tank main body 31 is arranged so that the flow of the liquid can be blocked vertically. In order to support the intermediate perforated plate 31e, a disc-shaped support member 31f having a smaller diameter than the emulsion destruction oil adsorption tank main body 31 is disposed between the intermediate perforated plate 31e and the perforated plate 31c to thereby provide the oil with emulsion destruction particles. The adsorbent 32 and the oil adsorbent 33 are prevented from being compressed.
[0043]
However, the position of the intermediate perforated plate 31e may be slightly around the center of the emulsion breaking oil adsorption tank main body 31. Further, the support member 31f is not limited to a cylindrical member, and may have any shape as long as the support member 31f can support the intermediate porous plate 31e, such as fixed with several bolts.
[0044]
It is best to fill the inside of the emulsion breaking oil adsorption tank main body 31 with the activated carbon 34 immediately downstream of the intermediate porous plate 31e, but it is almost optimal to fill the activated carbon 34 immediately upstream of the intermediate porous plate 31e. Can be seen. On the other hand, a considerable effect can be obtained by filling the intermediate porous plate 31e slightly before and after, and a considerable effect can be obtained by filling the end of the emulsion breaking oil adsorption tank main body 31 at either end.
[0045]
Here, as a method of making the oil adsorbent 32 with the emulsion breaking particles in which the emulsion breaking particles are attached to the adsorbent, a solution in which the emulsion breaking particles such as amine and barium sulfate are dissolved in the solvent is attached to the adsorbent. After drying, the solvent is generally evaporated and dried, but there is also a method of spraying the solution onto the oil adsorbent 33 in a mist state. A method is also conceivable in which the emulsion-breaking particles such as amine and barium sulfate are not dissolved but adhered to the adsorbent in a state of being uniformly mixed in a liquid.
[0046]
In this case, the emulsion breaking particles and the oil adsorbent may be filled in such a manner that they are not dispersed into the state of the oil adsorbing material with emulsion breaking particles 32 but are dispersed and dispersed among the adsorbents in the state of the particles. In this case as well, the activated carbon 34 may be arranged immediately before and immediately before or upstream of the intermediate porous plate 31c, or may be arranged immediately after or immediately before the porous plate 31c at the inlet or outlet.
[0047]
However, in any of the above cases, a configuration in which the activated carbon 34 is not provided is also conceivable.
[0048]
On the other hand, the amine used in the present invention may be an amine compound or a derivative thereof. When the amine compound or its derivative is at 25 ° C., it is preferable that the amine is in a solid state. Or a compound which becomes solid in a mixture with another compound. That is, the compounds may be used alone or in combination of two or more.
[0049]
These amine compounds and derivatives thereof are preferably one-amine, two-amine, three-amine, and derivatives thereof, more preferably one-amine, two-amine, and derivatives thereof, and particularly preferably. , A kind of amine (for example, stearylamine), and a derivative thereof.
[0050]
The oil adsorbent used for the oil adsorbent 33 and the oil adsorbent 32 with emulsion-breaking particles may be made of polypropylene or polystyrene fibers. However, the oil adsorbent used for the oil adsorbent 33 and the oil adsorbent 32 with emulsion destruction particles is not limited to these, but has an oil adsorption function and is insoluble in water. Anything else is acceptable.
[0051]
The oil-water separation method and the oil-water separation device according to the present invention for drain water generated from compressed air are configured as described above, and the operation thereof will be described in detail below.
[0052]
First, when the motor constituting the air compressor 110 is operated, the rotation of the motor is transmitted to the compressor to generate compressed air. Here, the generated compressed air passes through the compressed air pipe 201, the aftercooler 120, the compressed air pipe 202, the air tank 130, the compressed air pipe 203, the dryer 140, the compressed air pipe 204, the filter 150, and the compressed air pipe 205. Then, it is possible to send dry and clean compressed air to an actuator such as an air motor or an air cylinder at the tip as required.
[0053]
On the other hand, the drain water generated from the compressed air in the aftercooler 120, the air tank 130, the dryer 140, and the filter 150, together with the compressed air, is discharged from the drain discharge pipes 211a, 212a, 213a, 214a and the valves 221, 231, 241, 251 and the drain discharge. Pipes 211b, 212b, 213b, 214b, drain traps 222, 232, 242, 252, drain discharge pipes 211c, 212c, 213c, 214c, check valves 223, 233, 243, 253 and drain discharge pipes 211d, 212d, 213d, The oil-water separator 1A joins the collecting pipe 261 via the 214d, and further passes through the check valve 265 and the collecting pipe 262, and comprises the oil-water separation tank 10, the foreign matter capturing tank 20, and the emulsion-breaking oil adsorption tank 30. To remove various foreign matters including oil and dust, So that the can be from 4 to clean fresh water, such as there is no problem even if directly discharged into the river.
[0054]
In this case, in the oil-water separation device 1A, first, in the oil-floating separation chamber 11x of the oil-water separation tank 10, oil lighter than water is floated on the water surface, and various foreign substances heavier than water are settled to the bottom. A relatively clean drain water from which oil and various foreign matters have been removed is passed into the water storage chamber 11y through the space between the tip of the partition wall 11d formed between the water storage chamber 11y and the bottom of the oil / water separation tank main body 11. It has become. However, oil emulsified by being dissolved in the drain water is mixed.
[0055]
Therefore, in order to remove even a small amount of the emulsified oil, the suction pipe 11f and the discharge pipe 11e formed in the oil / water separation tank main body 11 of the oil / water separation tank 10 are connected to the suction pipe 11f by the operation of the vortex pump 310. The suction pipe 351 sucks substantially clean drain water in the water storage chamber 11y and air from the air suction pipe 315 at the same time, mixes, agitates, and pressurizes to create a high-concentration air-dissolved solution. The large air bubbles are separated by feeding the air solution into the separation tank 320, and the high concentration air solution is finally discharged from the discharge pipe 11e to the oil floating separation chamber 11x.
[0056]
In this way, the super-saturated air becomes fine bubbles by releasing the high-concentration air-dissolved liquid into the contaminated drain water of the oil flotation separation chamber 11x at a stretch and reducing the flow velocity of the liquid. It is intended to float and collect by attaching foreign matter such as oil or solid matter in dirty drain water to these bubbles.
[0057]
On the other hand, the compressed air sent into the oil / water separation tank 10 together with the drain water stays in the sealed portions of the upper part of the oil floating separation chamber 11x, which is the upper part of the oil / water separation tank main body 11, and the upper part of the water tank chamber 11y. ing. The dirty drain water immediately after being sent to the oil / water separation tank 10 by the transparent transparent tube 11a located outside the oil / water separation tank body 11 and communicating with the oil floating separation chamber 11x of the oil / water separation tank body 11, It is possible to visually check the state of dirt.
[0058]
Here, if the drain water sent into the water storage chamber 11y accumulates above the pipe end which is one end of the discharge pipe 11c formed in the water storage chamber 11y, it will stay at the upper part of the oil / water separation tank main body 11. The compressed air is fed into the foreign matter capturing tank 20 via the discharge pipe 11c, the connection pipe 271, the check valve 275, and the connection pipe 272, and further transmitted to the fresh water via the emulsion breaking oil adsorption tank 30. And is discharged.
[0059]
In this case, the force of the compressed air assists the movement of the drain water until the drain water is discharged from the fresh water pipe 274 because both the foreign matter capturing tank 20 and the emulsion breaking oil adsorption tank 30 are in a sealed state. I have. Note that a pressure of 0.01 to 0.7 MPa is set as the compressed air.
[0060]
However, oil and various foreign substances are separated in the oil floating separation chamber 11 of the oil-water separation tank 10 and the like, but there is a possibility that the emulsified oil may be sent to the foreign substance capturing tank 20 while being dissolved in the drain water. ing.
[0061]
Therefore, in the foreign matter capturing tank 20, the emulsified oil passes through the filter element 22, thereby separating the foreign matter, and at the same time, breaking the emulsion by releasing the bond between the water and the oil of the emulsified oil. The separated oil is coarsened. Then, while a part of the separated oil is absorbed by the filter element 22, a part of the separated oil, a part of the remaining emulsified oil, and water are formed through the connection pipe 273 by the pressure of the compressed air. It is sent to the destruction oil absorption tank 30.
[0062]
On the other hand, in the emulsion-breaking oil adsorption tank 30, the drain water fed together with the compressed air substantially uniformly mixes the oil adsorbent 32 with the emulsion breaking particles to which the emulsion breaking particles are adhered and the oil adsorbent 33 for adsorbing the oil. While being stored in the state, by randomly passing through the oil adsorbent 32 with the emulsion breaking particles and the oil adsorbent 33, in addition to the emulsion breaking in the foreign matter capturing tank 20, the oil adsorbent 32 with the emulsion breaking particles Emulsification is performed by releasing the bond between water and oil of the emulsified oil, and further, the separated oil is adsorbed. The oil adsorbent 33 adsorbs the oil that could not be adsorbed by the oil adsorbent 32 with emulsion-disrupted particles. The cleanliness of the drain water is improved by performing such processing randomly and repeatedly. Further, when drain water passes through the activated carbon 34, odors and pigments are removed.
[0063]
(Second embodiment)
As shown in FIG. 2, the second embodiment is different from the first embodiment in that the connection pipe 272, the foreign matter capturing tank 20, and the connection pipe 273 are replaced with a connection pipe 276, and the connection pipe 276 is connected. That is, the magnet 50 is disposed on the outer periphery of the substantially central portion of the 276. The operation is also omitted because the magnet 50 of the second embodiment is different from the foreign matter capturing tank 20 of the first embodiment.
[0064]
As a result, when the magnet 50 is provided on the outer periphery of the connection pipe 276 and when the magnet 50 is not provided, in the connection pipe 271 immediately after the oil-water separation tank 10 and the fresh water pipe 274 immediately after the emulsion-breaking oil adsorption tank 30, The following differences were observed in the stain of drain water.
(Immediately after the oil separation tank 10) (immediately after the emulsion breaking oil adsorption tank 30)
1. 70ppm without magnet 10ppm
2. 70ppm without magnet 15ppm
3. 70ppm without magnet 13ppm
4. 70ppm with magnet 5ppm
5. 70ppm with magnet 2ppm
6. 70ppm with magnet 3ppm
[0065]
In this case, the difference between the case where the magnet 50 is provided and the case where the magnet 50 is not provided is that the group (cluster) of the molecules of the water of the drain water is subdivided because the drain water passes through a strong magnetic force. However, the water molecules released by this subdivision release the hands that had been connected up to that point, and the release of the hands breaks the bond, resulting in an empty state where the chemical energy is increased. It is thought that it has brought.
[0066]
(Third embodiment)
As shown in FIG. 3, the third embodiment differs from the first embodiment in that, first, a drain is provided to a collecting pipe 261 of a piping system including a collecting pipe 261, a check valve 265, and a collecting pipe 262. The drain pipes 211a, 211b, 211c, 211d, 212a, 212b, 212c, 212d, 213a, 213b, 213c, 213d, 214a, 214b, 214c, 214d are all gathered, and the drain traps 222 individually arranged in the middle thereof. Instead of 232, 242, and 252, only one drain trap 266 is provided between the collecting pipes 253 and 254 to consolidate its functions. Second, it is connected to the collecting pipe 262 to separate oil and water. Instead of forming the tank 10, the connecting pipe 271, the check valve 275, the connecting pipe 272, the foreign matter capturing tank 20 and the connecting pipe 273, the oil is connected to the collecting pipe 264. Is that which constitutes the connecting pipe 278 and the connecting pipe 277 and the activated carbon containing recess 60 and the suction chamber 40.
[0067]
Here, by arranging only one drain trap 266 between the collecting pipes 253 and 254 and consolidating its functions, there is no need to consider the relationship between the plurality of drain traps 222, 232, 242 and 252. Control became possible.
[0068]
In this case, drainage of the drain water in the drain trap 266 is always performed for a predetermined time in a predetermined cycle, or alternatively, drainage is performed at any position upstream of the drain trap 266 in a predetermined cycle. It is conceivable to perform the operation for a predetermined time only when the presence or absence of water is confirmed and the presence of drain water is confirmed. At this time, immediately after the drain water is drained, if the presence of the drain water is further confirmed, the drain water may be discharged for a further predetermined time.
[0069]
The oil separation / adsorption tank 40 has an oil separation / adsorption tank main body 41 whose upper part is open to the atmosphere, and the oil separation / adsorption tank main body 41 has an oil / water separation tank 41u and a first oil adsorption tank 41v completely separated by walls 41f and 41g. And two tanks 41u, 41v, and 41w of the second oil adsorption tank 41w.
[0070]
The oil / water separation tank 41u is provided with a first introduction pipe 41a, which is an introduction pipe having three ends, one end of which is located near the bottom of the oil separation / adsorption tank main body 41 and the other end of which is oil. The upper part of the separation / adsorption tank main body 41 is open to the atmosphere, and the other end is located on the water surface so that the drain water in the first introduction pipe 41a flows out to the first oil adsorption tank 41v.
[0071]
Further, a second introduction pipe 41b, which is an introduction pipe having three ends, is provided in the first oil adsorption tank 41v, and one end is located near the bottom of the oil separation / adsorption tank main body 41, and the other end is provided. Is open to the atmosphere above the oil separation / adsorption tank main body 41, and the other end is located on the water surface so that the drain water in the second introduction pipe 41b flows out to the second oil adsorption tank 41w.
[0072]
The second oil absorption tank 41w is provided with a third introduction pipe 41c, which is an introduction pipe having three ends, one end of which is located near the bottom of the oil separation / adsorption tank main body 41 and the other end thereof. Is opened to the atmosphere above the oil separation / adsorption tank main body 41, and the other end is located on the water surface so that the drain water in the third introduction pipe 41c flows out to the connection pipe 277.
[0073]
Here, a suction pipe 41i and a discharge pipe 41h are formed at the bottom of the first oil adsorption tank 41v. The suction pipe 351a, the valve 340, the suction pipe 351b, and fine oil bubbles are created in the oil separation / adsorption tank 40 between the suction pipe 41i and the discharge pipe 41h, and foreign matters contained in the drain water are formed on the surface thereof. In order to remove the foreign substances floating on the water surface together with the oil together with the oil, the high-concentration air solution is sent out to the oil separation / adsorption tank 40 through the suction pipe 351b and the drain water and the air suction pipe 315 connected thereto. A vortex pump 310 for sucking air to mix, agitate and pressurize, a high-concentration air solution pipe 352, a separation tank 320 for separating large bubbles downstream of the vortex pump 310, and a high-concentration air solution pipe 353a. , A valve 350 and a high-concentration air solution pipe 353b are connected in the order described.
[0074]
In addition, on each of the upper parts of the first oil adsorption tank 41v and the second oil adsorption tank 41w, the foreign matter floating on the water surface by adhering the oil or other foreign matter contained in the drain water to the surface of the fine bubbles. The nets 41d and 41e are provided so as to hold the oil adsorbents 42a and 42b, which are intended to be adsorbed and removed together with oil and other foreign substances. In this case, the positions of the nets 41d and 41e may be parallel to the bottoms of the first oil adsorption tank 41v and the second oil adsorption tank 41w without being positioned obliquely.
[0075]
On the other hand, the activated carbon storage tank 60 includes a column 61b, a perforated plate 61a, an activated carbon 62, and a perforated plate 61a from below the activated carbon storage tank main body 61 in order to form spaces 61z above and below the activated carbon storage tank main body 61. And the strut 61b are arranged in the stated order.
[0076]
The relationship between the water surface of each of the tanks 41u, 41v, 41w of the oil separation and adsorption tank 40, the highest position of the connection pipe 278, and the highest position of the fresh water pipe 274 is that the drain water flowing into the oil separation and adsorption tank 40 is In order to be able to drain naturally from the fresh water pipe 274 due to the head, it is necessary that the heights be the same or lower in order.
[0077]
The oil-water separation method and the oil-water separation device according to the present invention for drain water generated from compressed air are configured as described above, and the operation thereof will be described in detail below.
[0078]
First, when the motor constituting the air compressor 110 is operated, the rotation of the motor is transmitted to the compressor to generate compressed air. Here, the generated compressed air passes through the compressed air pipe 201, the aftercooler 120, the compressed air pipe 202, the air tank 130, the compressed air pipe 203, the dryer 140, the compressed air pipe 204, the filter 150, and the compressed air pipe 205. Then, it is possible to send dry and clean compressed air to an actuator such as an air motor or an air cylinder at the tip as required.
[0079]
On the other hand, the drain water generated from the compressed air in the aftercooler 120, the air tank 130, the dryer 140, and the filter 150 is discharged together with the compressed air together with the drain discharge pipes 211a, 212a, 213a, 214a and the valves 221, 231, 241, 251 and the drain discharge. The pipes 211e, 212e, 213e, 214e, the check valves 223, 233, 243, 253, and the drain pipes 211d, 212d, 213d, 214d merge into the collecting pipe 263, and further, the drain trap 266 and the collecting pipe 264. Through the oil separation / absorption tank 40, the activated carbon storage tank 60, and the emulsion / water separation apparatus 1C composed of the emulsion destruction oil absorption tank 30 to remove various foreign matters including oil and dust. To clean water so that there is no problem if it is discharged as it is. To have.
[0080]
In this case, in the oil separation / adsorption tank 40, the drain water flowing into the oil / water separation tank 41u floats oil lighter than water on the water surface and precipitates various foreign substances heavier than water at the bottom to form relatively clean drain water. Then, it is pushed up to the water surface from the lower end of the first introduction pipe 41a, and is sent to the first oil adsorption tank 41v from the end branched in parallel with the water surface.
[0081]
Next, the drain water that has flowed into the first oil adsorption tank 41v discharges the high-concentration air-dissolved liquid created by the vortex pump 310 from the discharge pipe 41h to create fine bubbles, and the drain water flows on its surface. The oil and other foreign substances contained in the water adhere to the surface of the water and float on the surface of the water, and are adsorbed by the oil adsorbent 42a disposed on the surface of the water. Therefore, relatively clean drain water below the net 41d containing the oil adsorbent 42a is pushed up from the lower end of the second introduction pipe 41b to the water surface, and the second oil is branched from the end branched in parallel with the water surface. It is sent to the adsorption tank 41w.
[0082]
Further, the drain water flowing into the second oil adsorption tank 41w passes through the oil adsorbent 42b, and the relatively clean drain water below the net 41e containing the oil adsorbent 42b is moved to the lower part of the third inlet pipe 41c. Is pushed up to the water surface from the end, and is sent to the connection pipe 277 from the end branched in parallel with the water surface.
[0083]
The drain water sent into the activated carbon storage tank 60 by the connection pipe 277 can remove various foreign substances such as oil, solid foreign substances, pigments and odors by the activated carbon 62.
[0084]
(Fourth embodiment)
As shown in FIG. 4, the fourth embodiment is different from the third embodiment in that the connection pipe 279 and the foreign matter capturing tank 20 are connected to each other in place of the connection pipe 277, the activated carbon storage tank 60 and the connection pipe 278. That is, the configuration of the tube 273 is adopted. The operation is also omitted because the foreign matter trapping tank 20 of the second embodiment is different from the activated carbon storage tank 60 of the third embodiment.
[0085]
Lastly, the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment relate to the drain traps 222, 232, 242, and 252, which are different from each other, and the drain traps 266. The equipment, the oil / water separation tank 10, the oil separation / adsorption tank 40, the foreign matter capturing tank 20, the magnet 50, and the activated carbon storage tank 60 can be used interchangeably.
[0086]
【The invention's effect】
As is apparent from the above description, the following effects can be obtained by the present invention.
[0087]
First, by arranging the vortex pump and the separation tank, fine bubbles are created in the oil / water separation tank or oil separation / adsorption tank, and foreign matter of the drain water is attached to the bubbles and floated, thereby emulsifying oil. It has become possible to easily remove it.
[0088]
Second, by storing the oil adsorbent in the oil separation and adsorption tank, the oil can be removed early.
[0089]
Third, the provision of a foreign matter trapping tank, a magnet and an activated carbon storage tank, etc. facilitated removal of emulsified oil and the like.
[0090]
Fourth, the provision of the emulsion breaking oil adsorption tank facilitates removal of emulsified oil and the like.
[0091]
Fifth, by concentrating the drain trap in one place, control became easier.
[Brief description of the drawings]
FIG. 1 is a diagram showing the relationship between the whole showing the flow of compressed air and drain water and the first oil-water separator of the present invention.
FIG. 2 is a diagram showing the relationship between the whole showing the flow of compressed air and drain water and the second oil / water separator of the present invention.
FIG. 3 is a diagram showing the relationship between the whole showing the flow of compressed air and drain water and the third oil / water separator of the present invention;
FIG. 4 is a diagram showing the relationship between the whole showing the flow of compressed air and drain water and the fourth oil-water separator of the present invention;
FIG. 5 is a detailed view of an oil separation / adsorption tank relating to the third and fourth oil / water separation devices.
[Explanation of symbols]
1A ... oil-water separator
1B ・ ・ ・ ・ ・ ・ Oil water separator
1C: Oil / water separator
1D oil / water separator
10 Oil / water separation tank
11 Body of oil-water separation tank
11a ····· Transparent tube
11b ・ ・ ・ ・ ・ ・ ・ Suction pipe
11c ······ Discharge pipe
11d ····· Partition wall
... Release pipe
11f ····· Suction pipe
11x ... Oil floating separation chamber
11y ... water storage room
12 Pressure gauge
13 ・ ・ ・ ・ ・ ・ Floating oil removal valve
20 ... foreign matter capturing tank
21: Foreign matter trapping tank body
21a ... Inflow channel
21b ····· Outflow channel
22 Filter element
23 ... Pressure gauge
24 ... Pressure gauge
30 ... Emulsion breaking oil adsorption tank
31 ・ ・ ・ ・ ・ ・ Emulsion breaking oil adsorption tank body
31c ... perforated plate
31d ...
31e ····· Intermediate perforated plate
31f ... Support material
31z ... space
32 ・ ・ ・ ・ ・ ・ Oil adsorbent with emulsion breaking particles
33 ... Oil adsorbent
34 ・ ・ ・ ・ ・ ・ Activated carbon
40 ... Oil separation / adsorption tank
41 ・ ・ ・ ・ ・ ・ Oil separation / adsorption tank body
41a... First introduction pipe (introduction pipe)
41b ······ Second introduction pipe (introduction pipe)
41c ····· Third introduction pipe (introduction pipe)
41d
41e ... net
41f ... wall
41g ... wall
41h ····· Discharge tube
41i ... Suction pipe
41u ····· Oil-water separation tank (tank)
41v ... first oil adsorption tank (tank)
41w ····· Second oil absorption tank (tank)
42a ... Oil absorbent
42b ····· Oil sorbent
50 magnet
60 ・ ・ ・ ・ ・ ・ Activated carbon storage tank
61 ・ ・ ・ ・ ・ ・ Activated carbon storage tank body
61a ... perforated plate
61b
61z ... space
62 ・ ・ ・ ・ ・ ・ Activated carbon
110 air compressor
120 ・ ・ ・ ・ ・ Aftercooler (equipment that generates drain water)
130 ····· Air tank (device that generates drain water)
140 ····· Dryer (equipment that generates drain water)
150 filter (device that generates drain water)
201 ····· Compressed air piping
202 ····· Compressed air piping
203 ... Compressed air piping
204 ... Compressed air piping
205 ... Compressed air piping
211a ··· Drain discharge pipe
211b drain drain pipe
211c drain drain pipe
211d drain drain pipe
212a ··· Drain discharge pipe
212b ···· Drain discharge pipe
212c ···· Drain discharge pipe
212d ···· Drain discharge pipe
213a ··· Drain discharge pipe
213b ···· Drain discharge pipe
213c ···· Drain discharge pipe
213d ···· Drain discharge pipe
214a ···· Drain discharge pipe
214b ··· Drain discharge pipe
214c ··· Drain discharge pipe
214d ··· Drain discharge pipe
221 ... Valve
222 Drain trap
223 ... Check valve
231 ... Valve
232 Drain trap
233 ... Check valve
241 ····· Valve
242 ... Drain trap
243 ... Check valve
251 ... valve
252 ····· Drain trap
253 ... Check valve
261 · · · · Collecting pipe
262 ..... collecting pipe
263 ... Collecting pipe
264 · · · · Collecting pipe
265 ... Check valve
266 ···· Drain trap
271 ... Connection pipe
272 ... Connection pipe
273 ... Connection pipe
274 ・ ・ ・ ・ ・ Shimizu pipe
275 ... Check valve
276 ... Connection pipe
277 ... Connection pipe
278 ... Connection pipe
310 ····· Swirl pump
315 ... Air intake pipe
320 ... Separation tank
330 ・ ・ ・ ・ ・ Valve
340 ... valve
350 ・ ・ ・ ・ ・ Valve
351 ... Suction piping
351a ... Suction pipe
351b ··· Suction piping
352 ····· High concentration air solution pipe
353 ····· High concentration air dissolved liquid piping
353a ··· High concentration air dissolved liquid piping
353b ··· High concentration air dissolved liquid piping

Claims (9)

Foreign matter contained in the drain water adheres to the surface of fine bubbles that appear due to the release of a high concentration of the air solution while separating the oil contained in the drain water due to the specific gravity difference, and thereby the water surface A method for separating oil and water from drain water generated from compressed air, wherein foreign matter floating on the surface is removed together with oil. 2. The method according to claim 1, wherein the oil or solidified foreign matter is removed again from the drain water from which foreign matter floating on the water surface has been removed together with the oil, and then the emulsified oil is adsorbed. Oil-water separation method for drain water. 2. The method for separating oil-water drain water generated from compressed air according to claim 1, wherein a magnetic force is applied to the drain water from which foreign matters floating on the water surface have been removed together with the oil, and thereafter the emulsified oil is adsorbed. . An oil / water separation tank (10) for separating oil contained in drain water according to a difference in specific gravity, and fine bubbles are created in the oil / water separation tank (10) to adhere foreign matters contained in the drain water to the surface thereof, whereby the water surface A vortex pump (310) for sucking air and drain water to mix, agitate and pressurize air and drain water in order to send out a high-concentration air solution to the oil-water separation tank (10) for the purpose of removing foreign substances floating on the surface together with oil. ) And a separation tank (320) for separating large bubbles downstream of the vortex pump (310). An oil separation / adsorption tank (40) for separating oil contained in drain water by a specific gravity difference, and fine bubbles are created in the oil separation / adsorption tank (40) to adhere foreign matters contained in drain water to the surface thereof. In order to remove the foreign matter floating on the water surface together with the oil by the vortex, the air and the drain water are sucked to mix, agitate and pressurize the air and the drain water in order to send the high concentration air solution to the oil separation and adsorption tank (40). A pump (310), a separation tank (320) for separating large bubbles downstream of the vortex pump (310), and an oil adsorbent (42a, 42b) for adsorbing oil in the oil separation / adsorption tank (40). An oil / water separator for drain water generated from compressed air. The oil separation / adsorption tank (40) separates oil contained in the drain water according to a difference in specific gravity, an oil / water separation tank (41u), a suction pipe (41i) for sucking the drain water, and sends out a high-concentration air solution. A first oil adsorption tank (41v) forming a discharge pipe (41h) and containing the oil adsorbent (42a), and a second oil adsorption tank (41w) containing the oil adsorbent (42b); For the drain water flowing out of the tanks (41u, 41v, 41w), introduction pipes (41a, 41b, 41c) for sending drain water from the bottom and flowing out at the position of the water surface are arranged in the tanks (41u, 41v, 41w). The apparatus for separating oil and water of drain water generated from compressed air according to claim 5, wherein the apparatus is provided. Downstream of the oil / water separation tank (10) or the oil separation / adsorption tank (40), a foreign matter capturing tank (20) or an activated carbon storage tank (60) for removing oil and solidified foreign matter, and adsorbing the emulsified oil. The oil-water separation device for drain water generated from compressed air according to any one of claims 4 to 6, wherein the emulsion breaking oil adsorption tanks (30) are arranged in the order described. Downstream of the oil / water separation tank (10) or the oil separation / adsorption tank (40), a magnet (50) for generating a magnetic force and an emulsion-breaking oil adsorption tank (30) for adsorbing emulsified oil are arranged in this order. The apparatus for separating oil and water of drain water generated from compressed air according to any one of claims 4 to 6, wherein the apparatus is provided. A drain trap (266) that collectively discharges all drain water flowing from the drain water generating device (120, 130, 140, 150) upstream of the oil water separation tank (10) or the oil separation adsorption tank (40). The oil-water separator for drain water generated from compressed air according to any one of claims 4 to 8, wherein

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