JP2013128890A - Oil-water separator and drain water purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance work and to reduce production cost.SOLUTION: An oil-water separator 1 is configured to separate drain water Wa (a liquid to be treated) into oil and drain water. The separator 1 includes: a purification part P2 for separating a part of an oil portion contained in the drain water Wa introduced, based on specific gravity difference; a purification part P3 for separating a part of the oil portion contained in the drain water Wa flowed in with electrolysis treatment; and a purification part P4 for separating the oil portion contained in the drain water Wa flowed in from the drain water Wa by adsorbing into a filter Fb. The parts P2, P3 are connected to each other so that the drain water Wa in the part P2 flows into the part P3 by introducing the drain water Wa into the part P2. Also, the parts P3, P4 are connected to each other so that the drain water Wa in the part P3 flows into the part P4 by making the drain water Wa flow from the part P2 to the part P3.

Description

  The present invention relates to an oil / water separator that separates drain water containing oil into a liquid to be treated into oil and drain water, and a drain water purification system that includes such an oil / water separator and purifies drain water.

  The applicant specializes in a system (hereinafter also referred to as a “purification system”) that separates and purifies “drain water containing oil” generated in a drain water generation source such as a compressor into a liquid to be treated into oil and drain water. This is disclosed in Japanese Unexamined Patent Publication No. 2003-260306. In this case, the purification system disclosed by the applicant includes a pretreatment tank, a drain feeding means, an electrolytic tank, an air blowing tank, a primary adsorption tank, and a secondary adsorption tank.

  In this purification system, first, when the compressed air and the liquid to be processed are discharged from the drain water generation source in a mixed state, the mixed fluid is introduced into the pretreatment tank to convert the compressed air and the liquid to be processed. At the same time, a part of the oil contained in the separated liquid to be treated is adsorbed by a filter in the pretreatment tank (oil is roughly removed) and separated from the liquid to be treated. Next, the drain feeding means feeds the treatment target liquid in the pretreatment tank to the electrolytic tank, so that the fed treatment target liquid is electrolyzed in the electrolytic tank. Specifically, the negative charge of the oil particles in the liquid to be treated is removed by the metal ions eluted from the electrodes arranged in the electrolytic cell, so that simple oil particles are easily aggregated. Moreover, the liquid to be treated containing the electrolyzed oil particles is sent from the electrolytic cell to the air blowing tank by the pressure applied by the drain feeding means.

  Next, by releasing air (bubbles) from a plurality of air blowing ports provided at the bottom of the high-pressure vessel constituting the air blowing tank, the oil (oil particles) electrolyzed in the electrolytic tank floats together with the bubbles. Then, the oil component is aggregated above the air blowing tank. Next, when the liquid to be treated containing the agglomerated oil is passed through the primary adsorption tank and the secondary adsorption tank in this order by the pressure applied by the drain feeding means, it is disposed in both adsorption tanks. Oil is adsorbed and purified by the filter. Thus, the oil is removed from the “drain water containing oil” generated in the drain water generation source, and the drain water is purified.

JP 2003-260306 A (page 3-4, Fig. 1-2)

  However, the purification system disclosed by the applicant has the following problems to be improved. That is, in the purification system disclosed by the applicant, the liquid to be treated in the pretreatment tank is fed (pumped) to the electrolytic cell by the drain feeding means, and the pressure applied at this time causes the inside of the electrolytic cell. A configuration is adopted in which the liquid to be treated is fed (pressure fed) to the air blowing tank and the liquid to be treated in the air blowing tank is fed (pressure fed) to the primary adsorption tank. Therefore, in the purification system disclosed by the applicant, it is necessary to form each part downstream of the drain feeding means in the flow path of the liquid to be treated in a pressure resistant structure.

  In this case, in order to make a container body such as an electrolytic cell or an air blowing tank to have a pressure-resistant structure, the container body is sufficiently thickened and sealed between the main body portion and the lid body of the container body. It is necessary to screw the lid to the main body with the fixing screws. For this reason, in the purification system disclosed by the applicant, it is difficult to reduce the manufacturing cost due to the manufacturing cost of the container body such as the electrolytic cell and the air blowing tank. Is preferred. Further, in a container body that is sealed and the lid body is screwed to the main body portion by a plurality of fixing screws, the lid portion is closed from the main body portion during maintenance work (for example, an operation for cleaning the inside of the container body). The operation | work which removes a body or attaches a cover body to a main-body part after completion of an operation | work is complicated. For this reason, it is preferable to improve so that maintenance work can be implemented easily.

  The present invention has been made in view of the problems to be improved, and it is a main object of the present invention to provide an oil-water separator and a drain water purification system that can be easily maintained and can reduce manufacturing costs. .

  In order to achieve the above object, an oil / water separator according to claim 1 is an oil / water separator that separates drain water containing oil into the oil and drain water as a liquid to be treated, and the first container body A first processing section for separating a part of the oil contained in the processing target liquid introduced into the first container body from the processing target liquid by a specific gravity difference; and a second container body And part of the oil contained in the liquid to be treated that has an electrode accommodated in the second container body and flows into the second container body by electrolysis using the electrode. The process that has flowed into the third container body by having a second processing part to be separated from the liquid to be processed, a third container body, and a first oil adsorption filter housed in the third container body The first oil component is absorbed by the oil component contained in the target liquid. A third processing unit that is adsorbed by a filter and separated from the liquid to be processed, and the first processing unit, the second processing unit, and the third processing unit are disposed in the first container. The first container body and the second container body are connected to each other so that the treatment target liquid in the first container body flows into the second container body by introducing the treatment target liquid. And so that the liquid to be processed flows from the first container body into the second container body so that the liquid to be processed in the second container body flows into the third container body. The second container body and the third container body are connected to each other.

  The oil / water separator according to claim 2 is the oil / water separator according to claim 1, wherein the third processing unit is configured such that a water supply pipe provided with a water level adjusting mechanism is a water supply port of the third container body. To the first water level defined in advance and configured to store the liquid to be processed in the third container body, and the second processing unit has a higher level than the first water level. The water supply port of the second container body is connected to the third container body so that the liquid to be treated can be stored in the second container body up to the second water level.

  Furthermore, the oil-water separator according to claim 3 is the oil-water separator according to claim 1 or 2, further comprising a fourth container body capable of introducing a mixed fluid in which compressed air and the liquid to be treated are mixed. A gas-liquid separation processing unit that separates the mixed fluid into the compressed air and the processing target liquid in the fourth container body, and the processing target liquid separated in the gas-liquid separation processing unit is provided in the first container The fourth container body and the first container body are connected to each other so that they can be introduced into the processing section.

  The oil-water separator according to claim 4 is the oil-water separator according to claim 3, wherein the gas-liquid separation processing unit adsorbs part of the oil contained in the separated liquid to be treated. A second oil adsorption filter that is separated from the liquid to be treated is accommodated in the fourth container.

  Furthermore, the oil-water separator according to claim 5 is the oil-water separator according to claim 3 or 4, wherein the first partition plate and the second partition plate are placed on the lower side in a cylinder whose one opening is closed by a bottom plate. Are disposed in this order, and a lid is detachably attached to the other opening of the cylinder, and the first space between the bottom plate and the first partition plate in the cylinder and the cylinder By connecting the second partition plate and the second space between the lids with each other by a connecting pipe, a lower part of the cylindrical body, the bottom plate, the first partition plate, and the connection The first container body is constituted by the piping for use, the third container body is constituted by the middle part of the cylinder, the first partition plate and the second partition plate, and the cylinder To the body Upper part, the fourth container body by said second partition plate and the lid is constructed that.

  The oil-water separator according to claim 6 is the oil-water separator according to any one of claims 1 to 5, wherein the oil-water separator is connected to a drain outlet for draining the processing target liquid in the first container. And a second drain pipe connected to a drain outlet for draining the liquid to be treated in the third container, and the first drain pipe and the second drain pipe. A water stop valve is provided on the downstream side of the connection portion of the pipe, allows the liquid to be treated to flow from the drain outlet of the third container body toward the connection portion, and from the connection portion. A check valve for restricting the flow of the liquid to be treated in the direction toward the drain outlet of the third container body is disposed in the second drain pipe.

  Further, the drain water purification system according to claim 7 is connected to the oil / water separator according to any one of claims 1 to 6 and the water supply port of the third container body in the third processing unit, A water supply mechanism configured to supply the drain water generated by processing the liquid to be processed by the oil / water separator to a water supply target body.

  In the oil-water separator according to claim 1, the oil is contained in the first processing unit that separates part of the oil contained in the introduced processing target liquid from the processing target liquid due to the difference in specific gravity, and the inflowing processing target liquid. A second processing unit that separates a part of the oil content from the processing target liquid by electrolysis processing, and the first oil content adsorption filter adsorbs the oil content contained in the inflowing processing target liquid from the processing target liquid. And a third processing unit to be separated, and the processing target liquid is introduced into the first container so that the processing target liquid in the first container flows into the second container. The container body and the second container body are connected to each other, and the treatment target liquid flows from the first container body into the second container body, so that the treatment target liquid in the second container body becomes the third container body. The second container body and the third so as to flow into Container body are connected to each other. Further, in the drain water purification system according to claim 7, the drain water generated by processing the liquid to be treated by the oil / water separator is supplied by a water supply mechanism connected to the third processing unit in the oil / water separator. Send water to the subject.

  Therefore, according to the oil / water separator according to claim 1 and the drain water purification system according to claim 7, between the first processing unit and the second processing unit and between the second processing unit and the third processing unit. Without providing a water supply mechanism for pumping the processing target liquid downstream from any of the processing units, the processing target liquid introduced into the first processing unit is moved to the third processing unit to supply a water supply target. Can be sent to the water. Therefore, since it is not necessary to make the container body which comprises at least the 2nd processing part and the 3rd processing part into a pressure-resistant structure, these can be manufactured at low cost. In addition, since the container body constituting at least the second processing unit and the third processing unit is not a pressure-resistant structure, the lid body and the like in the container body can be easily removed. Maintenance work such as replacement of the oil adsorption filter can be easily performed.

  According to the oil-water separator according to claim 2, the third processing unit is configured to store the liquid to be processed in the third container body up to the first water level defined in advance, and the second processing unit. Since the second container body is connected to the third container body so that the liquid to be treated can be stored in the second container body up to the second water level higher than the first water level, A situation in which the liquid to be treated that has flowed into the third processing section (the liquid to be treated containing the oil separated and aggregated by the electrolysis process in the second processing section) flows back from the third processing section to the second processing section. Therefore, it is possible to avoid a situation in which dirt is generated in the second processing unit due to the dirty processing target liquid containing oil.

  According to the oil-water separator according to claim 3, the gas-liquid separation processing unit includes the gas-liquid separation processing unit that separates the mixed fluid in which the compressed air and the processing target liquid are mixed into the compressed air and the processing target liquid. By connecting the fourth container body and the first container body to each other so that the treated liquid to be treated can be introduced into the first treatment section, the high pressure discharged from the drain water generation source such as the compressed air dehumidifier As a result of avoiding a situation in which the mixed fluid (fluid in which the liquid to be processed and the compressed air are mixed) flows directly into the respective processing units on the downstream side of the gas-liquid separation processing unit, the third processing is performed from the first processing unit. It is possible to avoid a situation in which the liquid to be processed flows vigorously in the container body constituting each processing part of the part and leaks out of the container body from the gap between the parts.

  According to the oil-water separator according to claim 4, the gas-liquid separation processing unit is configured by accommodating the second oil component adsorption filter in the fourth container body, so that the first processing unit is changed from the gas-liquid separation processing unit. As a result of sufficiently reducing the amount of oil contained in the processing target liquid flowing into the processing unit, the amount of oil in each processing unit is sufficiently reduced without causing a situation where the oil separation capacity in each processing unit after the first processing unit is insufficient. The amount of oil contained in the drain water finally sent from the third processing unit can be sufficiently reduced.

  According to the oil-water separator according to claim 5, the first container body, the third container body, and the fourth container body are formed in one cylindrical body, so that each of them is compared with a configuration in which each is separated. Thus, not only can the material cost be reduced sufficiently, but also the space required for installing the oil / water separator (area occupied by the oil / water separator) can be made sufficiently narrow.

  According to the oil-water separator according to claim 6, the first drain pipe connected to the drain port of the first container body and the second drain pipe connected to the drain port of the third container body. A liquid to be treated that is connected to each other and that is provided with a water stop valve on the downstream side of the connection portion of the first drain pipe and the second drain pipe and that faces the connection portion from the drain port of the third container body Since the check valve for restricting the flow of the liquid to be treated in the opposite direction is provided in the second drain pipe, the first processing unit is provided only by providing one stop valve. Since it is possible to control the drainage of the processing target liquid in each processing unit from the first to the third processing unit, it is possible to sufficiently reduce the manufacturing cost of the oil-water separator, and at the time of draining the processing target liquid, one water stop Since the liquid to be processed in each processing section can be drained simply by operating the valve, Work can be more easily implemented.

It is a block diagram which shows the structure of the drain water purification system 100 which concerns on embodiment of this invention, and the drain water purification system 100A which concerns on other embodiment of this invention. It is sectional drawing which shows the structure of the oil-water separator 1 and the pumping unit 2 of the drain water purification system 100 which concerns on embodiment of this invention. It is sectional drawing which shows the structure of 1 A of oil-water separators and the pumping unit 2 of the drain water purification system 100A which concern on other embodiment of this invention.

  Embodiments of an oil / water separator and a drain water purification system according to the present invention will be described below with reference to the accompanying drawings.

  First, the configuration of the drain water purification system 100 will be described with reference to the attached drawings.

  The drain water purification system 100 shown in FIG. 1 is an example of a “drain water purification system”, and moisture and oil contained in the compressed air compressed by the air compressor 200 are compressed air in the compressed air dehumidifier 300. The drain water Wa (drain water containing oil) generated by being removed from the inside is defined as a “treatment target liquid”, and the oil contained in the drain water Wa is separated from the drain water Wa to be purified. ing. Specifically, the drain water purification system 100 includes an oil / water separator 1, a pumping unit 2, and an oil / water separator 3.

  The oil / water separator 1 is an example of an “oil / water separator”, and purifies the drain water Wa by separating a part of the oil contained in the drain water Wa generated in the compressed air dehumidifier 300. Wb is generated. Specifically, as shown in FIG. 2, the oil / water separator 1 includes processing tanks 10 and 20. The processing tank 10 includes cylinders 11 and 12, a partition plate 13, a connecting pipe 14, and a lid body 15, and the processing tank 20 includes a cylinder body 21, a lid body 22, and an electrode 23. Has been.

  The cylindrical body 11 has a bottom plate fixedly attached to one opening (a lower opening in the figure) of the cylindrical main body, and is formed into a bottomed cylindrical shape as a whole. It is configured so that it can be installed upright on the grounding surface X in the state of being made. In this case, in the oil-water separator 1 of this example, the main body of the cylinder 11 and the main body of the cylinder 12 described later constitute a “cylinder”. The cylindrical body 12 has a disk-like shape at one opening (lower opening in the figure) of the main body formed in a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the main body of the cylindrical body 11. A bottom plate is fixedly attached and formed in a bottomed cylindrical shape as a whole. As shown in the figure, the cylindrical body 12 is fitted into an upper part of the cylindrical body 11 with the bottom plate facing downward, and is integrated with the cylindrical body 11. In this case, in the oil / water separator 1, the bottom plate of the cylinder 12 constitutes a “second partition plate”.

  The partition plate 13 corresponds to a “first partition plate”, and is fixed to the inside of the cylinder 11 so as to be positioned between the bottom plate of the cylinder 11 and the bottom plate of the cylinder 12 fitted in the cylinder 11. Attached. The connecting pipe 14 is disposed in the cylinder 11 so as to communicate the bottom plate of the cylinder 12 fitted in the cylinder 11 and the partition plate 13, and between the bottom plate of the cylinder 11 and the partition plate 13. A space (an example of a “first space”) and an inner space of the cylinder 12 (a space between a bottom plate of the cylinder 12 and a lid 15 described later: an example of a “second space”) are mutually connected. Connect to

  The lid body 15 is an example of a “lid body”, is formed in a disc shape, and can be removed together with the cylinder body 12 at the other opening (the upper opening in the figure) of the main body of the cylinder 11. It is attached. In addition, the lid 15 is provided with a connection port to which a pipe 400 connected to the drain outlet of the compressed air dehumidifier 300 can be connected, and is supplied from the compressed air dehumidifier 300 through the pipe 400 together with the compressed air. A pipe 16 for guiding the drain water Wa (“mixed fluid” in a state where the compressed air and the drain water Wa are mixed) into the cylindrical body 12 is attached. In this case, in the oil / water separator 1 of this example, since the treatment tank 10 does not have a pressure-resistant structure, the lid 15 is provided with a plurality of vent holes 15a and can be prevented from falling without being sealed or the like. It is fixed to the cylinders 11 and 12 with several bolts.

  In the oil / water separator 1 of this example, the “fourth container body” is configured by the main body portion of the cylindrical body 12, the bottom plate of the cylindrical body 12, and the lid body 15, and corresponds to the “gas-liquid separation processing section”. The purification processing part P1 is configured in the cylinder 11. Further, in the oil / water separator 1, a “first container body” is configured by the lower portion of the main body of the cylinder body 11, the bottom plate and partition plate 13 of the cylinder body 11, and the connecting pipe 14. A purification processing section P2 corresponding to “processing section” is configured in the cylindrical body 11. Further, in the oil / water separator 1, a “third container body” is configured by the middle portion in the cylinder length direction of the main body of the cylinder body 11, the partition plate 13, and the bottom plate of the cylinder body 12. A purification processing section P4 corresponding to “processing section” is configured in the cylindrical body 11.

  Further, in the oil / water separator 1 of the present example, the filter Fa corresponding to the “second oil component adsorption filter” is disposed in the purification processing unit P1, and the filter corresponding to the “first oil component adsorption filter”. Fb is disposed in the purification processing section P4. In this case, for example, the filters Fa and Fb are small pieces obtained by cutting a cotton-shaped polypropylene, a non-woven fabric made of polypropylene fibers, and a polypropylene thin plate into a bag-like net made of polyethylene. An oil adsorbent composed of at least one of the above and an emulsion breaking sheet are filled to form a cartridge. In addition, in the drain water purification system 100 of this example, as said filter Fa, Fb, the filling rate of an oil component adsorbent etc. is lower than the oil component adsorption filter arrange | positioned in the oil-water separation apparatus 3 mentioned later (unit volume). An oil adsorption filter is employed in which the amount of the oil adsorbent filled per unit is small.

  Furthermore, in the oil / water separator 1 of the present example, the water supply port 11a for supplying the drain water Wa processed in the purification processing unit P2 to the processing tank 20 and the drain water Wa processed in the purification processing unit P4 are generated. A water supply port 11b for supplying the drain water Wb to the oil / water separator 3, a purification treatment part P2 during maintenance of the oil / water separator 1, and a drain water Wa in the purification treatment part P <b> 3 (described later) The cylinder 11 is provided with a drain outlet 11c for draining to a tank or the like. In this case, the water supply port 11b also functions as a “drain port” for draining the drain water Wa in the purification processing unit P4 to a container body (not shown) during maintenance of the oil / water separator 1.

  Further, in the oil / water separator 1, the pipe 31 (an example of “first drain pipe”) connected to the drain port 11 c and the pipe 32 (“second drain pipe”) connected to the water feed port 11 b. Are connected to each other. Further, in the oil / water separator 1, a water stop valve 31 a is provided on the downstream side of the connection portion of the pipes 31 and 32, and the drain water Wb is directed from the water supply port 11 b toward the connection portion of the pipes 31 and 32. A check valve 32a is provided in the pipe 32. The check valve 32a restricts the flow of the drain water Wa or the like in the direction from the connecting portion of the pipes 31 and 32 toward the water supply port 11b.

  The cylindrical body 21 is formed in a bottomed cylindrical shape as a whole, with a bottom plate fixedly attached to one opening (lower opening in the figure) of the cylindrical main body. The lid body 22 is formed in a disc shape and has a plurality of vent holes 22a, and is detachably attached to the other opening (the upper opening in the figure) in the main body of the cylinder 21. Yes. The electrode 23 is accommodated in the cylindrical body 21 and connected to a power supply unit (not shown). In this case, in the oil / water separator 1 of this example, since the treatment tank 20 does not have a pressure-resistant structure, the lid 22 is a cylinder with several bolts to the extent that it can be prevented from falling without being sealed. It is fixed to the body 21. In the oil / water separator 1 of this example, the cylinder body 21 and the lid body 22 are combined to form a “second container body”, and a purification processing section P3 corresponding to the “second processing section” is configured. ing.

  Further, in the oil / water separator 1, the pipe 33 connected to the water supply port 11 a formed in the cylinder 11 of the treatment tank 10 is connected to the bottom plate of the cylinder 21, and the purification treatment is performed from the purification treatment unit P <b> 2. The drain water Wa flows into the part P3. Furthermore, in this oil-water separator 1, the water supply port 21a for supplying the drain water Wa processed in the purification treatment part P3 to the treatment tank 10 is provided in the cylindrical body 21, and the purification treatment parts P3 and P4 are connected by the pipe 34. Are connected to each other.

  In the oil / water separator 1, the purification treatment units P1 and P2 are connected to each other so that the drain water Wa separated in the purification treatment unit P1 is introduced to the purification treatment unit P2 by its own weight, and the purification treatment unit P1 performs the purification treatment. The purification treatment parts P2, P3 are connected to each other by the pipe 33 so that the drain water Wa in the purification treatment part P2 flows into the purification treatment part P3 by introducing the drain water Wa into the part P2. The purification treatment parts P3 and P4 are mutually connected by the piping 34 so that the drain water Wa in the purification treatment part P3 flows into the purification treatment part P4 when the drain water Wa flows from the treatment part P2 into the purification treatment part P3. It is connected.

  Further, in the oil / water separator 1, the drain water Wa discharged from the compressed air dehumidifier 300 in a state of being mixed with the compressed air is separated into the compressed air and the drain water Wa in the purification processing unit P1 and separated. Compressed air is released to the atmosphere from the gaps between the cylinders 11 and 12 and the lid 15 and the vent hole 15a, and part of the oil contained in the separated drain water Wa is adsorbed by the filter Fa. Thus, a configuration in which the water is separated from the drain water Wa is employed. Further, in the oil / water separation apparatus 1, a part of the oil contained in the drain water Wa separated in the purification processing unit P1 is separated from the drain water Wa by the specific gravity difference in the purification processing unit P2, and in the purification processing unit P2. Part of the oil contained in the treated drain water Wa is separated from the drain water Wa by electrolysis in the purification treatment unit P3, and the oil contained in the drain water Wa treated in the purification treatment unit P3 is separated. A configuration in which the drain water Wb is generated by being adsorbed by the filter Fb and separated from the drain water Wa in the purification processing unit P4 is employed.

  On the other hand, the pressure feeding unit 2 is an example of a “water feeding mechanism” and includes a pressure vessel 2a, a three-way valve 2b, and a pipe 2c. In this case, as an example, the three-way valve 2b is connected to a pipe 600 for supplying compressed air from which moisture or oil has been removed in the compressed air dehumidifying device 300 to a compressed air supply target (not shown). Further, in the pressure vessel 2a, a water level detection mechanism (not shown) that outputs an electrical signal in accordance with the water level of the drain water Wb stored as described later is housed. Further, the pressure vessel 2 a is connected to the water supply port 11 b of the treatment tank 10 in the oil / water separator 1 via the pipes 35 and 32 (an example of “water supply pipe”) and via the pipe 36 connected to the pipe 35. Are connected to the oil-water separator 3. In this case, the pipe 35 is allowed to move the drain water Wb in the direction from the water supply port 11b of the treatment tank 10 toward the pressure vessel 2a, and to move the drain water Wb in the direction from the pressure vessel 2a to the water supply port 11b. A check valve 35a to be regulated is disposed.

  Further, in the pressure feeding unit 2 of the present example, the three-way valve 2b is opened to the atmosphere in a normal state where the drain water Wb is not fed from the oil / water separator 1 to the oil / water separator 3, and thus, in a normal state, the pressure vessel The inside of 2a is atmospheric pressure. Furthermore, as will be described later, the drain water Wb fed from the treatment tank 10 (purification treatment unit P4) of the oil / water separator 1 is stored in the pressure vessel 2a, so that the level of the drain water Wb in the pressure vessel 2a is increased. When the predetermined water supply start water level is reached, the three-way valve 2b supplies the compressed air to the pressure vessel 2a via the pipe 2c, so that the drain water Wb in the pressure vessel 2a passes through the pipes 35 and 36. The oil / water separator 3 is pumped (watered). Further, when the water level of the drain water Wb stored in the cylindrical body 21 is lowered to the water supply stop water level with the pressure feeding to the oil / water separator 3, the three-way valve 2b stops the supply of compressed air, The water supply of the drain water Wb stops and the pressure vessel 2a becomes atmospheric pressure.

  In this case, in the drain water purification system 100 of the present example, the above-described pumping unit 2 functions as a “water level adjusting mechanism”, and the water level L1 defined in advance in the purification treatment unit P4 in the treatment tank 10 of the oil / water separator 1. A configuration is adopted in which the drain water Wa is stored up to (an example of “first water level”). Specifically, in this drain water purification system 100, the water supply start water level defined for the pressure feeding unit 2 is connected to the purification processing part P3 in the purification processing part P4 (in this example, the connection part of the pipe 34). The position of the pressure feeding unit 2 (pressure vessel 2a) with respect to the oil / water separator 1 (treatment tank 10) is defined so as to be positioned below the lower side. As a result, as will be described later, the drain water Wb in the pressure vessel 2a in the pumping unit 2 is transferred to the oil / water separator 3 when the water level of the drain water Wa in the purification processing section P4 is about to exceed the above water supply start water level. As a result, the drain water Wa in the purification treatment unit P4 is fed to the pressure feeding unit 2 as the drain water Wb. As a result, the drain water Wa having the same water level as the water supply start water level is stored in the purification treatment unit P4. Maintained.

  Further, in the drain water purification system 100, the drain water Wa is stored up to a water level L2 (an example of “second water level”) defined in advance in the purification treatment part P3 in the treatment tank 20 of the oil / water separator 1. Is adopted. Specifically, the water supply port 21a of the treatment tank 20 constituting the purification treatment unit P3 is provided at a position higher than the water supply start water level, that is, the water level of the drain water Wa stored in the purification treatment unit P4. Therefore, the drain water Wa is stored in the purification processing part P3 up to a higher water level than the drain water Wa in the purification processing part P4. In addition, in the oil-water separator 1 of this example, although the purification process parts P3 and P4 are mutually connected by the piping 34 installed horizontally, the piping installed so that it might become diagonal in front view (viewing from the front) (Not shown) or when the purification treatment parts P3 and P4 are connected to each other by pipes (not shown) that are bent in the vertical direction, the height of the highest part in these pipes is set to the above water supply By making it higher than the start water level, the drain water Wa can be stored in the purification treatment part P3 up to a water level higher than the drain water Wa in the purification treatment part P4.

  The oil / water separator 3 is an example of a “water supply object”, and separates the oil contained in the drain water Wb supplied (pressure-fed) from the oil / water separator 1 by the pressure-feeding unit 2 from Wb. By purifying the water, clean drain water W that does not contain oil is generated and sent to the pipe 500 (see FIG. 1). Specifically, the oil / water separator 3 is filled with an oil adsorbent and an emulsion breaking sheet in a bag-like net formed of polyethylene, for example, in the same manner as the filters Fa and Fb in the oil / water separator 1 described above. An oil adsorption filter formed in a cartridge shape and a pressure-resistant container body (not shown) configured to accommodate the oil adsorption filter. The drain water Wb fed from the oil / water separator 1 is supplied to the drain water Wb. The drainage water Wb is purified by adsorbing the contained oil content by the oil content adsorption filter, thereby generating the drain water W. In this case, in the oil / water separator 3, the oil adsorption filter having a higher filling rate of the oil adsorbent and the like (the amount of the oil adsorbent filled per unit volume) is higher than the filters Fa and Fb in the oil / water separator 1. It has been adopted.

  Next, the drain water Wa purification processing method (the drain water W generation method) by the drain water purification system 100 will be described.

  In the drain water purification system 100, a mixed fluid in which the drain water Wa and the compressed air are mixed is supplied from the compressed air dehumidifier 300 through the pipe 400 as the air compressor 200 and the compressed air dehumidifier 300 are operated. Sometimes, this mixed fluid is first introduced into the purification treatment part P1 of the treatment tank 10 in the oil / water separator 1. At this time, in the purification processing unit P1, the mixed fluid from the pipe 400 is discharged into the purification processing unit P1 through the pipe 16, so that the air having a small mass (compressed air) and the drain water Wa having a large mass (Gas-liquid separation process). Further, the compressed air separated from the mixed fluid is released to the atmosphere from the gap between the cylinder 12 and the lid 15 and the vent hole 15a, and the drain water Wa flows down in the purification processing part P1 by its own weight. At this time, a part of the oil contained in the drain water Wa is adsorbed and separated from the drain water Wa by the filter Fa disposed in the purification processing unit P1.

  On the other hand, the drain water Wa flowing down to the lowermost part of the purification treatment part P1 (in this example, the surface of the bottom plate of the cylindrical body 12) flows into the connection pipe 14 (in the purification treatment part P2), and the partition plate 13 The inside of the connecting pipe 14 flows down toward the space between the bottom plate and the bottom plate. At this time, the relatively large oil droplets of the oil contained in the drain water Wa that has flowed into the purification processing unit P2 has a specific gravity smaller than that of the drain water W (components other than the oil in the drain water Wa). When it stays in the upper part of the purification treatment part P1 (in the connection pipe 14) or flows down in the connection pipe 14 together with the drain water Wa, it floats upwards over the purification treatment part P1. Thereby, a part of oil component contained in drain water Wa which flowed in purification treatment part P2 is separated from drain water Wa by specific gravity difference.

  Further, the drain water Wa from the purification processing unit P1 sequentially flows into the purification processing unit P2, so that the drain water Wa in the purification processing unit P2 (the drain water Wa from which part of the oil has been separated due to the difference in specific gravity). ) Flows into the purification processing section P3 through the pipe 33. At this time, the drain water Wa flowing into the purification treatment part P3 is electrolyzed, and the oil contained in the drain water Wa is separated from the drain water Wa and aggregates. Further, the agglomerated oil component (oil droplets) floats upward in the purification processing unit P3. In addition, about the electrolysis process which makes drain water Wa object, since it is the same as the process in the electrolytic cell in the purification system which the applicant has disclosed, detailed description is abbreviate | omitted.

  Next, the drain water Wa from the purification processing unit P2 sequentially flows into the purification processing unit P3, so that the water surface of the drain water Wa in the purification processing unit P3 reaches the edge of the water supply port 21a in the processing tank 20. When it reaches (when the water level L2 is reached), this drain water Wa (drain water Wa containing agglomerated oil) flows from the water supply port 21a through the pipe 34 into the purification treatment part P4. At this time, when the drain water Wa that has flowed into the purification processing section P4 flows down in the purification processing section P4 due to its own weight, the oil component separated and aggregated from the drain water Wa by the electrolysis processing in the purification processing section P3 It is adsorbed by the filter Fb and separated from the drain water Wa.

  Therefore, most of the oil is adsorbed and removed by the filter Fb while the drain water Wa flows down to the lowest part of the purification processing part P4 (in this example, the surface of the partition plate 13 in the cylinder 11). As described above, the purification process of the drain water Wa by the oil / water separator 1 is completed, and the drain water Wb containing a very small amount of oil is generated. In this case, in the oil / water separator 1, as described above, the water supply port 21a of the purification treatment unit P3 (treatment tank 20) is stored in the “water supply start water level” in the pressure feeding unit 2, that is, in the purification treatment unit P4. Since the drain water W is provided at a position higher than the level of the drain water Wa, the situation in which the drain water W that has flowed into the purification processing unit P4 from the purification processing unit P3 flows backward from the purification processing unit P4 to the purification processing unit P3 is avoided. Yes.

  Next, the drain water Wb generated by the oil separation process in the purification processing unit P4 flows into the pressure vessel 2a of the pressure feeding unit 2 through the pipes 32 and 35 from the water feeding port 11b. When the water level of the drain water Wb that has flowed into the pressure vessel 2a reaches the “water supply start water level” described above, a three-way valve is set according to an electrical signal from the water level detection mechanism accommodated in the pressure vessel 2a. 2b supplies the compressed air from the pipe 600 into the pressure vessel 2a. At this time, the drain water Wb in the pressure vessel 2 a is pushed downward by the supplied compressed air and discharged into the pipe 35. As described above, since the check valve 35a is provided on the pipe 35 on the oil / water separator 1 side, the drain water Wb discharged into the pipe 35 passes through the pipe 36 and the oil / water separator 3. Water is sent to.

  When the water level of the drain water Wb in the pressure vessel 2a reaches the above-mentioned “water supply stop water level” along with the water supply to the oil / water separator 3, the three-way valve 2b is turned on in accordance with the electrical signal from the water level detection mechanism. The supply of compressed air is stopped and the pressure vessel 2a is released to the atmosphere. At this time, the water supply of the drain water Wb to the oil / water separator 3 is stopped and the inside of the pressure vessel 2a becomes the atmospheric pressure, so that the drain water Wb from the purification treatment part P4 in the oil / water separator 1 is supplied to the pressure vessel. Flows into 2a. In this way, by alternately repeating the inflow of the drain water Wb from the oil / water separator 1 to the pressure vessel 2a and the water supply of the drain water Wb from the pressure vessel 2a to the oil / water separator 3, the oil / water separator 1 generates the water. The drain water Wb is sequentially sent to the oil / water separator 3.

  Further, in the oil / water separator 3 in which the drain water Wb is fed by the pressure feeding unit 2, the oil contained in the drain water Wb is adsorbed by the oil adsorption filter and separated from the drain water Wb. As a result, the drain water Wb is contained in the drain water Wb. The oil component that has been removed is almost completely removed, and clean drain water W that does not contain the oil component is generated. Further, the generated drain water W is drained from the oil / water separator 3 to the pipe 500 (see FIG. 1), and drained into a drain groove (not shown) as an example. Thus, the drain water Wa purification process by the drain water purification system 100 is completed.

  On the other hand, when the filters Fa and Fb of the oil / water separator 1 have adsorbed a sufficient amount of oil with use over a long period of time, the filters Fa and Fb are replaced with new filters Fa and Fb. Specifically, first, the water supply valve from the compressed air dehumidifier 300 is stopped by closing a water stop valve (not shown) provided in the pipe 400, and at the end of the pipe 31 outside the figure, drain water is stopped. A container body (bucket or the like) for storing Wa and Wb is disposed.

  Next, the water stop valve 31a is opened. At this time, first, the drain water Wa (the drain water Wa containing the oil separated by the specific gravity difference) in the purification treatment part P2 is drained from the drain port 11c to the pipe 31 and flows into the container body. In addition, with the drainage of the drain water Wa in the purification processing unit P2, the drain water Wa in the purification processing unit P3 (drain water Wa including the oil separated by the electrolysis process) flows into the purification processing unit P2, and is purified. In a state of being mixed with the drain water Wa in the processing unit P2, the water is drained from the drain port 11c to the pipe 31 and flows into the container body. In this case, in the oil / water separator 1 of the present example, since the check valve 32a is disposed in the pipe 32, the drain water Wa drained from the drain port 11c to the pipe 31 passes through the water feed port 11b into the purification treatment unit P4. The situation that flows into is avoided.

  Furthermore, when the water level of the drain water Wa in the purification treatment units P2 and P3 is lowered to the same level as the water level of the drain water Wa in the purification treatment unit P4 due to the drainage of the drain water Wa from the drain port 11c. The drain water Wa is continuously drained from the port 11c, and the drain water Wa in the purification treatment part P4 is drained into the pipe 32 from the water feed port 11b as the drain water Wb after the oil is adsorbed by the filter Fb. At this time, the drain water Wa drained from the drain port 11c to the pipe 31 and the drain water Wb drained from the water feed port 11b to the pipe 32 merge at the connecting portion of the pipes 31, 32, and then the drain water Wa. , Wb flows into the container body as a fluid mixture. Thereafter, the drain water Wa in the purification treatment units P2 and P3 is drained from the drain port 11c and the drain water Wa in the purification treatment unit P3 is drained from the water feed port 11b as the drain water Wb and stored in the container body. Thereafter, the part of the pipe 35 closer to the pipe 32 than the check valve 35a, the drain water Wb in the pipe 32, and the drain water Wa in the pipe 31 are stored in the container body, so that the inside of the oil-water separator 1 In this state, there is almost no drain water Wa.

  Next, the lid 15 is removed from the cylinders 11 and 12 and the filter Fa is taken out from the cylinder 12. Subsequently, the cylinder 12 is removed from the cylinder 11 and the filter Fb is taken out from the cylinder 11. The taken out filters Fa and Fb are transported to a processing facility and incinerated as an example. Next, the lid body 22 is removed from the cylinder body 21 to take out the electrode 23 from the cylinder body 21, and the lid body 22 and the electrode 23 are washed together with the lid body 15 and the cylinder body 12 removed from the cylinder body 11. Subsequently, the inside of the cylinders 11 and 21 is cleaned. At this time, the wash water that has flowed into the cylinders 11 and 21 is drained from the water supply port 11a and the water supply port 11b and stored in the container body together with the drain waters Wa and Wb described above.

  Next, a new filter Fb is accommodated in the cylinder 11. Then, while attaching the cylinder 12 on the filter Fb and accommodating the new filter Fa in the cylinder 12, the lid body 15 is attached to the cylinders 11 and 12. Next, after the electrode 23 is accommodated in the cylinder 21, the lid body 22 is attached to the cylinder 21. Subsequently, the water stop valve 31a is closed, and clean water (for example, tap water) that does not contain oil or the like from the vent hole 22a of the lid 22 in the treatment tank 20 is contained in the treatment tank 20 (purification). Pour into the processing part P3). At this time, the water that has flowed into the purification processing section P3 from the vent 22a flows into the purification processing section P2 from the cylindrical body 21 via the pipe 33. At this time, with the inflow of water from the purification processing unit P3, the air in the purification processing unit P2 moves into the cylindrical body 12 and then from the gap between the cylindrical body 12 and the lid 15 in the processing tank 10. Exhausted outside. Thereby, the purification process part P2 is air-bleeded.

  Further, when the space between the bottom plate of the cylindrical body 11 and the partition plate 13 in the purification processing unit P2 is filled with the inflowing water, water is continuously injected from the vent hole 22a, whereby the pipe 33 and the purification processing unit P1. The water level in the connecting pipe 14 gradually increases. Furthermore, when the inside of the pipe 33 is also filled with water, the water level in the processing tank 20 (tubular body 21) and the connecting pipe 14 gradually rises, and water is stored in the purification processing section P3 up to the water level L2. Further, when water is further injected from the vent hole 22a, the water injected into the purification processing unit P3 flows into the purification processing unit P4 through the pipe 34 from the water supply port 21a. Thereby, the replacement of the filters Fa and Fb and the air bleeding operation after the replacement are completed.

  Thereafter, the drain water Wa is purified using new filters Fa and Fb by opening the water stop valve provided in the pipe 400. In addition, about the drain water Wa drained from the drain port 11c and stored in the container body, the drain water Wb drained from the water feed port 11b and stored in the container body, etc., as an example, a water stop valve provided in the pipe 400 In a state where the supply of the mixed fluid is stopped by operating in a closed state, the lid 15 is removed from the cylinders 11 and 12 and poured into the cylinder 12 or the lid 15 is removed from the cylinders 11 and 12. By pouring into the cylindrical body 12 from the vent hole 15a without detaching, the purification process is performed in the same procedure as in the purification process of the drain water Wa discharged from the compressed air dehumidifier 300. Further, the purification treatment can be performed in the purification treatment section P4 of the treatment tank 10 by pouring into the cylinder body 21 from the vent hole 22a provided in the lid body 22 of the treatment tank 20.

  As described above, in the oil / water separator 1, the purified fluid P1 that separates the mixed fluid in which the compressed air and the drain water Wa are mixed into the compressed air and the drain water Wa, and the introduced drain water Wa are included. A purification processing unit P2 that separates a part of oil from the drain water Wa by a specific gravity difference, and a purification processing unit P3 that separates a part of the oil contained in the drained water Wa from the drain water Wa by electrolysis And a purification treatment unit P4 that adsorbs oil contained in the drain water Wa that has flowed in to the filter Fb and separates it from the drain water Wa, and the drain water Wa is introduced into the purification treatment unit P1 by introducing a mixed fluid. The “fourth container” constituting the purification processing unit P1 and the “first container” constituting the purification processing unit P2 are separated and introduced into the purification processing unit P2. The first and second purification processing units P2 are connected to each other and configured so that the drain water Wa in the purification processing unit P2 flows into the purification processing unit P3 when the drain water Wa is introduced into the purification processing unit P2. The “container body” and the “second container body” constituting the purification processing section P3 are connected to each other, and the drain water Wa flows into the purification processing section P3 from the purification processing section P2, thereby the inside of the purification processing section P3. The “second container body” constituting the purification processing section P3 and the “third container body” constituting the purification processing section P4 are connected to each other so that the drain water Wa flows into the purification processing section P4. Yes. Further, in this drain water purification system 100, the drain water Wb generated by processing the drain water Wa by the oil / water separator 1 is converted into oil / water by the pumping unit 2 connected to the purification processing unit P4 in the oil / water separator 1. Water is fed to the separation device 3.

  Therefore, according to the oil / water separator 1 and the drain water purification system 100, drain water is provided between the purification treatment units P1 and P2, between the purification treatment units P2 and P3, and between the purification treatment units P3 and P4. The drain water Wa separated from the compressed air in the purification processing unit P1 can be moved to the purification processing unit P4 and supplied to the pressure feeding unit 2 without providing a water supply mechanism for pumping Wa downstream. Therefore, since it is not necessary to make the container body which comprises each process part of purification process part P1-P4 into a pressure | voltage resistant structure, the processing tanks 10 and 20 which comprise these can be manufactured cheaply. Moreover, since the processing tanks 10 and 20 do not have a pressure-resistant structure, the lids 15 and 22 and the cylindrical body 12 can be easily removed. As a result, the cleaning operation in the processing tanks 10 and 20 and the filters Fa and Fb Maintenance work such as replacement work can be easily performed.

  Further, according to the oil / water separator 1, the purification processing unit P4 is configured to store the drain water Wa up to a predetermined water level L1 (first water level), and the purification processing unit P3 is more than the water level L1. By connecting the purification treatment units P3 and P4 to each other so that the drain water Wa can be stored up to the high water level L2 (second water level), the drain water Wa (purification treatment) flowing into the purification treatment unit P4 from the purification treatment unit P3. Since the situation where the drain water Wa containing the oil separated and aggregated by the electrolysis process in the part P3 flows backward from the purification processing part P4 to the purification processing part P3 is avoided, the purification process is performed by the dirty drain water Wa containing the oil. It is possible to avoid a situation in which dirt is generated in the part P3.

  Furthermore, according to the oil / water separator 1, the purification processing unit P1 that separates the mixed fluid in which the compressed air and the drain water Wa are mixed into the compressed air and the drain water Wa is provided, and the drain separated in the purification processing unit P1. By connecting the purification processing parts P1 and P2 to each other so that the water Wa can be introduced into the purification processing part P2, the high-pressure mixed fluid (drain water Wa and compressed air mixed together) discharged from the compressed air dehumidifier 300 is mixed. As a result of avoiding a situation in which the fluid) flows directly into the processing units P2 to P4 downstream of the purification processing unit P1, the drain water Wa flows vigorously in the processing tanks 10 and 20, and the processing tanks from the gaps of the respective parts. It is possible to avoid a situation of leaking outside of 10 and 20.

  Further, according to the oil / water separator 1, the amount of oil contained in the drain water Wa flowing from the purification processing unit P1 into the purification processing unit P2 is sufficiently reduced by accommodating the filter Fa in the purification processing unit P1. As a result, the drainage that is finally separated from the purification processing unit P4 by sufficiently separating the oil content in each processing unit without causing a situation where the oil separation capacity in each processing unit after the purification processing unit P2 is insufficient. The amount of oil contained in the water Wb can be sufficiently reduced.

  Furthermore, according to the oil / water separator 1, the purification costs P1, P2, and P4 are formed in the cylindrical body 11, so that the material cost can be sufficiently reduced as compared with the configuration in which each is separated. In addition to this, the space required for installing the oil / water separator 1 (area occupied by the oil / water separator 1) can be sufficiently narrowed.

  Moreover, according to this oil-water separator 1, the piping 31 connected to the drain port 11c of the purification processing part P2 and the piping 32 connected to the water supply port 11b of the purification processing part P4 are mutually connected, and the piping The water stop valve 31a is provided on the downstream side of the connection part of the 31 and 32, and the flow of the drain water Wa directed from the water supply port 11b toward the connection part of the pipes 31 and 32 is allowed, and the opposite direction is provided. Since the check valve 32a for restricting the flow of the drain water Wa is disposed in the pipe 32, the drainage of the drain water Wa in the purification treatment units P2 to P4 can be controlled only by providing one stop valve 31a. The manufacturing cost of the oil / water separator 1 can be sufficiently reduced, and when drain water Wa is drained, the drain water Wa in the purification treatment units P2 to P4 is drained only by operating one water stop valve 31a. Can Kill Therefore, it is possible to more easily carry out the maintenance work.

  The configurations of the “oil / water separator” and the “drain water purification system” are not limited to the configurations of the oil / water separator 1 and the drain water purification system 100 described above. For example, the oil / water separation apparatus 1 including the treatment tank 10 integrally configured with the purification treatment units P1, P2, and P3 has been described as an example. However, the “fourth container” constituting the “gas-liquid separation treatment unit” is described. Two of the "body", the "first container body" constituting the "first processing section", and the "third container body" constituting the "third processing section", Each can be configured separately.

  Specifically, the oil / water separator 1A (another example of the “oil / water separator”) in the drain water purification system 100A (another example of the “drain water purification system”) shown in FIGS. 20 and 50, and the “fourth container body” constituting the “gas-liquid separation processing section” and the “first container body” constituting the “first processing section” are integrally configured. In addition, a “third container body” constituting the “third processing section” is configured separately from these. In addition, about the component which has a function similar to the component of drain water purification system 100 and oil-water separation apparatus 1 which were mentioned above in this drain water purification system 100A and oil-water separation apparatus 1A, it attaches | subjects the same code | symbol and overlaps description. Is omitted.

  In this oil-water separator 1A, instead of the treatment tank 10 in the oil-water separator 1 described above, a purification processor P1 corresponding to a “gas-liquid separation processor” and a purification processor corresponding to a “first processor” P2 and the bottomed cylindrical cylinder 41 are integrally formed. In this case, in the oil / water separator 1A, the cylinder body 41 and the partition plate 42 constitute a “first processing section”, and the cylinder body 41, the partition plate 42, and the lid body 43 constitute a “fourth container body”. Is configured. Further, in the oil / water separator 1A, the purification processing section P4 corresponding to the “third processing section” is configured independently in the bottomed cylindrical cylindrical body 51.

  In this case, in the oil / water separator 1 </ b> A, the cylinder body 51 and the lid body 52 constitute a “third container body”. Further, in the oil / water separator 1A, since the processing tank 40 does not have a pressure-resistant structure, the lid body 43 is provided with a plurality of vent holes 43a and can be prevented from falling without being sealed or the like. Are fixed to the cylinder 11 with several bolts. Further, in the oil / water separator 1A, since the processing tank 50 is not a pressure-resistant structure, the lid body 52 is provided with a plurality of vent holes 52a and can be prevented from falling without being sealed or the like. The cylinder 51 is fixed with several bolts.

  Further, in the oil / water separator 1A, a pipe 33 for feeding the drain water Wa in the purification treatment section P2 to the treatment tank 20 is connected to the water supply port 41a of the cylindrical body 41, and in the purification treatment section P4, A pipe 32 for feeding the drain water Wb generated by processing of Wa to the oil / water separator 3 by the pressure feeding unit 2 is connected to the water feeding port 51 a of the cylindrical body 51. In the oil / water separator 1 </ b> A, the pipe 33 and the pipe 32 are connected to each other by a pipe 30. In this case, in the oil / water separator 1A, the water supply port 41a functions also as a “drain port”, the pipes 33 and 30 constitute a “first drain pipe”, and the pipe 32 is a “second drain pipe”. A "tube".

  Even when such a configuration is adopted, the drain water Wa is moved by its own weight from the purification processing unit P1 to the purification processing unit P4 and generated in the purification processing unit P4 in the same manner as the oil-water separator 1 described above. The drain water Wb flows into the pressure vessel 2a of the pressure feeding unit 2 by the inflow of the drain water Wa to the purification processing unit P4. Therefore, since it is not necessary to form the processing tanks 40, 20, and 50 in a pressure-resistant structure, the same effect as the oil / water separator 1 can be obtained. In addition, purification processing part P1, P2 in said oil-water separator 1A can also be comprised separately, and also when such a structure is employ | adopted, there exists an effect similar to said oil-water separator 1, 1A. be able to.

DESCRIPTION OF SYMBOLS 1,1A Oil-water separator 2 Pumping unit 3 Oil-water separator 10, 20, 40, 50 Processing tank 11, 12, 21, 41, 51 Cylindrical body 11a, 11b, 41a Water supply port 11c, 51a Drain port 13, 42 Partition plate 14 Piping for connection 15, 22, 43, 52 Lid 16, 30-36, 400, 500, 600 Piping 15a, 22a, 43a, 52a Vent 23 Electrode 31a Water stop valve 32a, 35a Check valve 100 Drain water purification System 200 Air compressor 300 Compressed air dehumidifier Fa, Fb filter L1, L2 Water level P1-P4 Purification unit W, Wa, Wb Drain water

Claims (7)

An oil-water separator that separates drain water containing oil into the oil and drain water as a liquid to be treated,
A first processing unit having a first container body and separating a part of the oil contained in the processing target liquid introduced into the first container body from the processing target liquid due to a difference in specific gravity; ,
A part of the oil contained in the liquid to be treated that has a second container body and an electrode accommodated in the second container body and flows into the second container body is used for the electrode. A second processing unit that is separated from the liquid to be processed by electrolysis,
The first container is provided with the third container body and the first oil adsorption filter housed in the third container body, and the oil contained in the processing target liquid flowing into the third container body is the first container. A third processing unit that is adsorbed on the oil adsorption filter and separated from the processing target liquid,
The first processing unit, the second processing unit, and the third processing unit are configured to introduce the processing target liquid in the first container by introducing the processing target liquid into the first container. The first container body and the second container body are connected to each other so that the liquid flows into the second container body, and the liquid to be processed enters the second container body from the first container body. The second container body and the third container body are connected to each other so that the liquid to be treated in the second container body flows into the third container body by flowing in apparatus. The third processing unit is configured such that a water supply pipe provided with a water level adjusting mechanism is connected to a water supply port of the third container body, and the third container body includes the water supply pipe to the first water level defined in advance. It is configured to store the liquid to be processed,
The second processing section can store the liquid to be processed in the second container body up to a second water level higher than the first water level. The oil-water separator according to claim 1 connected to the container body.   A gas-liquid having a fourth container body capable of introducing a mixed fluid in which compressed air and the liquid to be processed are mixed and separating the mixed fluid into the compressed air and the liquid to be processed in the fourth container body. The fourth container body and the first container body are connected to each other so as to be able to introduce the processing target liquid separated in the gas-liquid separation processing section into the first processing section. The oil-water separator according to claim 1 or 2.   The gas-liquid separation processing unit has a second oil adsorption filter that adsorbs a part of the oil contained in the separated processing target liquid and separates it from the processing target liquid in the fourth container body. The oil-water separator according to claim 3, wherein the oil-water separator is housed.   The first partition plate and the second partition plate are arranged in this order from the lower side in a cylinder whose one opening is closed by a bottom plate, and the lid can be removed from the other opening of the cylinder. The first space between the bottom plate and the first partition plate in the cylinder and the second space between the second partition plate and the lid in the cylinder are connected to each other by a connecting pipe. The first container body is constituted by the lower part of the cylindrical body, the bottom plate and the first partition plate, and the connecting pipe, and the middle part of the cylindrical body, The third container body is configured by the first partition plate and the second partition plate, and the fourth container body is configured by the upper portion of the cylindrical body, the second partition plate, and the lid body. Has been Oil-water separation apparatus of claim 3 or 4, wherein.   A first drain pipe connected to a drain outlet for draining the processing target liquid in the first container body; and a second drain pipe connected to a drain outlet for draining the processing target liquid in the third container body. A drainage pipe is connected to each other, and a water stop valve is provided on the downstream side of the connection part of the first drainage pipe and the second drainage pipe, and the drainage port of the third container body A check valve that permits the flow of the processing target liquid in a direction toward the connection part and restricts the flow of the processing target liquid in a direction from the connection part toward the drain outlet of the third container body is the first check valve. The oil-water separator according to claim 1, wherein the oil-water separator is disposed in the drainage pipe.   The oil / water separator according to any one of claims 1 to 6 and the water supply port of the third container body in the third processing section are connected to each other, and the processing target liquid is processed by the oil / water separator. A drain water purification system comprising a water supply mechanism for supplying the generated drain water to a water supply object.

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