JP5644031B2 - Drain water treatment method - Google Patents

Description

  The present invention relates to a drain water treatment method for treating drain water stored in a gas-liquid separation tank when replacing a filter in a drain treatment apparatus.

  For example, in the oil-water separator disclosed by the applicant in Japanese Patent Application Laid-Open No. 2004-73961, drain water (drain water and compressed) generated at various drain water generation sources such as an air compressor and pumped together with compressed air. A configuration is adopted in which the pretreatment (coarse treatment) is performed in the pretreatment tank and then the main treatment (posttreatment) is performed in the main treatment tank. Specifically, the pretreatment tank separates the mixed fluid into drain water and compressed air, releases the compressed air into the atmosphere, and temporarily stores the drain water to be discharged into the main treatment tank. It is configured to be possible. In addition, an oil adsorbent is disposed in the pretreatment tank so as to be able to adsorb a part of the oil contained in the stored drain water. Furthermore, this treatment tank is filled with an oil adsorbent at a higher density than the pretreatment tank so that the oil contained in the drain water pumped from the pretreatment tank by the pressure feeding unit (drain feeding means) can be adsorbed. ing. Therefore, in the oil / water separator disclosed by the applicant, the oil is removed from the drain water over two stages of the pretreatment tank and the main treatment tank, so that the drain water from the drain water source is sufficiently purified. The

  In addition, in the oil-water separator disclosed by the applicant, the oil adsorbent in the pretreatment tank and the oil adsorbent in the main treatment tank absorb a large amount of oil and purify it with long-term use. The oil adsorbent having a reduced purification capacity can be taken out and replaced with a new oil adsorbent when the oil is reduced. As a result, in the oil / water separator disclosed by the applicant, it is not necessary to replace the set of equipment such as the pretreatment tank and the main treatment tank with new equipment every time the purification capacity of the oil adsorbent decreases. Running cost is sufficiently reduced.

JP 2004-73961 A (page 4-5, Fig. 1-2)

  However, the method for using the oil-water separator disclosed by the applicant (hereinafter also referred to as “conventional method of use”) has the following problems to be improved. That is, in the conventional method of use, when the purification capacity of the oil adsorbent in the pretreatment tank and the oil adsorbent in the main treatment tank is reduced, the oil adsorbent with the reduced purification capacity is taken out and a new oil adsorbent is extracted. Have been replaced. In this case, in the pretreatment tank, relatively large oil droplets contained in the drain water pumped from the drain water generation source floated above the drain water without being adsorbed by the oil adsorbent. It is stored in the state. Therefore, drain water having a relatively high concentration of oil is stored in the pretreatment tank when the oil adsorbent is replaced. For this reason, in the conventional method of use, a new oil adsorbent disposed in the pretreatment tank or the main treatment tank comes into contact with drain water having a high oil content immediately after completion of the replacement work and adsorbs the oil. It becomes. As a result, in the conventional method of use, immediately after the replacement work is completed, the useful life of the new oil adsorbent (the period until it falls below the specified purification capacity) is shortened. Is preferred.

  In this case, in order to prevent the drain water having a high oil content in the pretreatment tank from coming into contact with the new oil adsorbent, the drain water in the pretreatment tank is removed from the container body other than the pretreatment tank ( A method of use is also conceivable in which the drained water is pumped into a bucket and the like, and the drained water is separately treated by various known sewage treatment methods. However, when such a method of use is adopted, the running cost of the oil / water separator increases as much as the cost required for the sewage treatment of the drained pumped water.

  The present invention has been made in view of such a problem to be improved, and a drain water treatment method capable of avoiding a situation in which the useful life of a filter is shortened immediately after completion of replacement work without causing an increase in running cost. The main purpose is to provide

  In order to achieve the above object, the drain water treatment method according to claim 1 includes a gas-liquid separation tank for separating a mixed fluid in which drain water and compressed air are mixed into the drain water and the compressed air, and the gas-liquid separation. Stored in the gas-liquid separation tank during replacement of the filter in a drain water treatment apparatus provided with a filter that purifies the drain water by passing the drain water supplied from a water supply port provided in the tank. A drain water treatment method for treating the drain water, wherein a removal step of removing the filter from a filter connecting portion for connecting the filter to the water supply port, and draining the drain water in the gas-liquid separation tank Before draining drain water in the gas-liquid separation tank from the drain port provided in the gas-liquid separation tank separately from the water supply port and removing it in the removal step A purification step for purifying the drain water by passing through a filter, a conveyance step for conveying the filter that has completed the purification step to a disposal processing position, and a disposal for performing a predefined disposal processing at the disposal processing position The processes are executed in this order.

  Further, the drain water treatment method according to claim 2 is the drain water treatment method according to claim 1, wherein the housing step of housing the filter in a transport container for transporting the filter in the transport step, the removal step. Prior to the purification step, the connecting step of connecting the filter and the drain port removed in step 1 to each other by a connection pipe, and the closing step of closing the water supply port, and in the purification step, the mixed fluid The drainage water in the gas-liquid separation tank is drained by introducing the mixed fluid into the gas-liquid separation tank from an inlet provided in the gas-liquid separation tank.

  Further, the drain water treatment method according to claim 3 is the drain water treatment method according to claim 1, wherein the housing step of housing the filter in a transport container for transporting the filter in the transport step, and the removal. Prior to the purification step, the connection step of connecting the filter and the drain port removed in the step to each other by a connecting pipe is performed prior to the purification step, and in the purification step, the air in the transfer container is sucked The drain water in the gas-liquid separation tank is sucked and drained through the filter and the connection pipe.

  Furthermore, the drain water treatment method according to claim 4 is the drain water treatment method according to any one of claims 1 to 3, wherein, in the purification step, the water supply port with respect to the filter removed in the removal step. The drain water is allowed to pass in a second direction opposite to the first direction in which the drain water fed from is passed.

  Further, the drain water treatment method according to claim 5 is the drain water treatment method according to claim 1, wherein the filter connecting portion closes the water supply port by disposing a lid on the filter connecting portion. An attachment step for connecting the drainage pipe to the filter connecting portion and connecting the filter and the drain outlet to each other by a connection pipe are connected to the purification step. The drain water in the gas-liquid separation tank is drained by introducing the mixed fluid from an introduction port provided in the gas-liquid separation tank so that the mixed fluid can be introduced in the purification step. The drain in a second direction opposite to the first direction through which the drain water supplied from the water supply port passes. To pass down water.

  According to the drain water treatment method of claim 1, by removing the filter from the filter connecting portion, draining the drain water in the gas-liquid separation tank from the drain outlet, and passing the filter removed in the removal step. A purification process for purifying, a transport process for transporting the filter that has completed the purification process to the disposal position, and a disposal process for executing a predefined disposal process at the disposal position are performed in this order, and the disposal process is performed. By draining the drain water in the gas-liquid separation tank with a used filter, the drain water in the gas-liquid separation tank may be contaminated with a new filter without treating the drain water separately from the filter. Can be removed from the gas-liquid separation tank, so that the service life of the new filter can be increased immediately after completion of the replacement operation without causing an increase in running costs. It is possible to avoid a situation to be reduced.

  In addition, according to the drain water treatment method of claim 2, the housing step of accommodating the removed filter in the transport container, the connecting step of connecting the removed filter and the drain outlet to each other by the connecting pipe, and the water outlet In the purification step, the drainage water in the gas-liquid separation tank is drained by introducing a mixed fluid from the inlet of the gas-liquid separation tank. Utilizing the components that the oil-water separator originally has, eliminating the need for a power source to pump the drain water in the separation tank and the complicated work of manually pumping the drain water in the gas-liquid separation tank Since the drain water in the gas-liquid separation tank can be pumped and purified by the pressure applied to the mixed fluid, the cost required for the drain water treatment can be sufficiently reduced. Can. Moreover, since the purified drain water is drained from the filter into the transport container, it is possible to avoid a situation in which the periphery of the filter is flooded with the purified drain water.

  Further, according to the drain water treatment method of claim 3, the storing step of storing the removed filter in the transport container, and the connecting step of connecting the removed filter and the drain outlet to each other by the connection pipe are purifying steps. In the purification process, the drain water in the gas-liquid separation tank is sucked and drained through the filter and the connection pipe by sucking the air in the transport container in the purification process. Without performing the complicated work of manually pumping up the drain water in the tank, the components in the oil / water separator are equipped with the suction device such as a vacuum cleaner. Since the drain water can be purified by suction through the filter, the cost required for the drain water treatment can be sufficiently reduced. Moreover, since the purified drain water is drained from the filter into the transport container, it is possible to avoid a situation in which the periphery of the filter is flooded with the purified drain water. Also, unlike the drain water treatment method that drains and drains the drain water in the gas-liquid separation tank by introducing the mixed fluid from the inlet of the gas-liquid separation tank, the state of the dirt in the gas-liquid separation tank is changed. Purify the drain water in the gas-liquid separation tank with a filter in the transport container while visually observing it, or supply tap water etc. to the gas-liquid separation tank when the dirt in the gas-liquid separation tank is severe, for example. The water can be purified by a filter in the transport container.

  Furthermore, according to the drain water treatment method according to claim 4, in the purification step, the second direction opposite to the first direction for allowing the drain water fed from the water feed port to pass through the removed filter. The drain water is allowed to pass through the oil adsorbent on the downstream side in the first direction (that is, on the upstream side in the second direction), which has higher purification capacity than the oil adsorbent on the upstream side in the first direction. The drain water can be purified by reliably adsorbing oil contained in the drain water in the liquid separation tank.

  Further, according to the drain water treatment method of claim 5, the drainage pipe is connected to the filter connection portion and the drainage pipe is connected to the filter connection portion, and the removal is performed in the removal step. The attachment process for attaching the filter to the filter connecting portion and the connection process for connecting the filter and the drain outlet to each other by the connecting pipe are performed prior to the purification process, and in the purification process, from the inlet of the gas-liquid separation tank By introducing the mixed fluid, the drain water in the gas-liquid separation tank is drained, and the drain is drained in a second direction opposite to the first direction in which the drain water fed from the water feed port passes through the filter. Passing water eliminates the need for a power source for pumping up drain water in the gas-liquid separation tank and a complicated operation for manually pumping up drain water in the gas-liquid separation tank. Since the drain water in the gas-liquid separation tank can be pumped to the filter and purified by the pressure applied to the mixed fluid using the components inherently provided in the oil / water separator, The cost required for this process can be sufficiently reduced.

It is a block diagram which shows the structure of the oil-water separation apparatus 1 of the object which processes drain water by the "drain water processing method" concerning this invention. It is explanatory drawing for demonstrating embodiment of the "drain water treatment method" concerning this invention. It is explanatory drawing for demonstrating other embodiment of the "drain water treatment method" concerning this invention. It is explanatory drawing for demonstrating other embodiment of the "drain water treatment method" concerning this invention.

  Hereinafter, an embodiment of a drain water treatment method according to the present invention will be described with reference to the accompanying drawings.

  The oil-water separator 1 shown in FIG. 1 is an example of a “drain water treatment device” in which a “gas-liquid separator” and a “filter” are integrally configured, and is from the compressed air generated by the air compressor 100. A process for purifying the drain water W (dirty drain water containing oil or dust) removed by the compressed air dehumidifier 200 is configured to be executable. The oil / water separator 1 includes a base 11, a gas-liquid separator 12, a pretreatment filter 13, a posttreatment filter 14, and a pressure adjustment device 15. As will be described later, the oil / water separation device 1 includes a compressed air dehumidifier 200. A supply pipe 300 for supplying drain water to the oil / water separator 1 is connected to the gas-liquid separation tank 12, and a drain hose 400 for draining clean drain water W after purification treatment into a drain groove or the like. Is connected to the post-processing filter 14. The base portion 11 is fixed to the installation location of the oil / water separator 1 by anchor bolts (not shown), thereby preventing the oil / water separator 1 from moving or overturning from the installation location.

  The gas-liquid separation tank 12 is a separation tank for separating the mixed fluid WA in which the drain water W and the compressed air A are mixed into the drain water W and the compressed air A, and has a bottomed cylindrical outer cylinder 21; A bottomless cylindrical inner cylinder 22 disposed in the outer cylinder 21 and a partition plate 23 that closes the upper opening of the outer cylinder 21 are provided. The gas-liquid separation tank 12 is configured to accommodate the pretreatment filter 13 inside the inner cylinder 22, and is configured to be able to removably attach the posttreatment filter 14 above the outer cylinder 21. Yes. In this case, a flange 21 a for attaching the post-processing filter 14 is provided at the upper end portion of the outer cylinder 21. In addition, an inlet 25 for introducing the mixed fluid WA through the supply pipe 300 is provided at the center of the outer cylinder 21 in the height direction, and a valve 25v is provided. Further, an exhaust port 26 for exhausting the compressed air A separated in the gas-liquid separation tank 12 toward the pressure adjusting device 15 is provided on the upper end side in the height direction of the outer cylinder 21.

  In addition, the lower end side in the height direction of the outer cylinder 21 has air bubbles at the time of cleaning the oil / water separator 1, when the oil / water separator 1 is moved to another installation place, and at the time of filter replacement work described later. A drain port 27 for draining the drain water W in the liquid separation tank 12 is provided, and a valve 27v is provided. In this case, the gas-liquid separation tank 12 is mainly configured such that the space between the outer cylinder 21 and the inner cylinder 22 functions as a “separation tank”, and the bottom plate of the outer cylinder 21 and the inner cylinder 22. A gap 22 a that allows the drain water W to pass therethrough is provided between the lower end portion, and the drain water W separated from the mixed fluid WA passes from the space between the outer cylinder 21 and the inner cylinder 22 to the inside of the inner cylinder 22. Water (space in which the pretreatment filter 13 is installed) passes through the gap 22a and is fed. Therefore, in this gas-liquid separation tank 12, a portion of the gap 22a provided on the lower end side of the inner cylinder 22 functions as a “water supply port”.

  A cylindrical connecting pipe 23a for connecting the pretreatment filter 13 is disposed at the center of the partition plate 23 as described later. Further, as will be described later, when the post-processing filter 14 is removed from the gas-liquid separation tank 12, the connection pipe 23 a drains the drain water W in the post-processing filter 14 to the outside of the oil / water separator 1. A connecting pipe 24 is connected to provide a valve 24v. In this gas-liquid separation tank 12, the partition plate 23 is attached to the outer cylinder 21 so as to be sandwiched between the flange 21a of the gas-liquid separation tank 12 and the flange 41a of the post-processing filter 14 as described later. Thus, a “pressure vessel” is formed by the outer cylinder 21 and the partition plate 23. Further, in this oil / water separator 1, the partition plate 23 arranged on the outer cylinder 21 is connected to the “filter connection portion” for connecting the post-processing filter 14 to the gas-liquid separation tank 12 via the pre-processing filter 13. ”.

  The pretreatment filter 13 is a filter for executing pretreatment (coarse treatment) of the oil / water separation treatment (purification treatment) by the oil / water separation apparatus 1, and includes a container body 31 and a lid body 32 as an example. The emulsion breaking sheet 33, the oil adsorbing material 34, and the nonwoven fabric 35 are filled in the storage container. In this case, as an example, after the container body 31 is processed into a bottomed cylindrical shape by a blow molding process using polypropylene, an introduction port 31a is opened at the bottom thereof. The lid 32 is processed into a desired shape by an injection molding process using polyethylene as an example. In this case, the lid 32 is formed with a drain port 32a for draining the drain water W that has been processed by the pretreatment filter 13, and can be inserted through the connection pipe 23a provided in the partition plate 23. A cylindrical body is erected.

  The pretreatment filter 13 is configured so that a plurality of emulsion breaking sheets 33, an oil adsorbing material 34, and a plurality of non-woven fabrics 35 are covered at the upper opening of the container body 31 in a state in which the bottom of the container body 31 is filled in this order. A body 32 is attached and configured. As an example, the emulsion breaking sheet 33 is composed of an amine-based emulsion breaking sheet. As will be described later, the emulsion breaking sheet 33 is a sheet for breaking the emulsified oil contained in the drain water W introduced into the container body 31 from the inlet 31a and separating it into oil and moisture. At the same time, it functions as a partition for preventing the filled oil adsorbent 34 from being pushed out of the pretreatment filter 13 (container body 31) from the inlet 31a.

  The oil adsorbing material 34 is an oil adsorbing material having extremely small voids, and is made of, for example, polypropylene processed into a cotton shape, and adsorbs oil contained in the drain water W. In this case, it is also possible to adopt a configuration in which the container body 31 is filled with a thin string knitted from polypropylene fibers or a small piece cut from a polypropylene thin plate instead of the polypropylene processed into cotton. The nonwoven fabric 35 is comprised with the fiber of the polypropylene as an example. The non-woven fabric 35 functions as a partition for preventing the filled oil adsorbing material 34 from being pushed out of the pretreatment filter 13 (container 31) from the drain port 32a of the lid 32, and also for oil adsorption. In the same manner as the material 34, it also functions as an oil adsorbing material that adsorbs oil contained in the drain water W.

  On the other hand, the post-processing filter 14 is a filter for performing post-processing (main processing) of the oil-water separation processing by the oil-water separation device 1, and includes, as an example, a cylindrical body 41, a top plate 42, and a partition plate 46. An emulsion breaking sheet 43, an oil adsorbing material 44, and a nonwoven fabric 45 are filled in the configured space. The cylindrical body 41 is formed in a cylindrical shape having the same diameter as the outer cylinder 21 in the gas-liquid separation tank 12, and a flange 41 a for connecting the post-processing filter 14 to the gas-liquid separation tank 12 at the lower end portion thereof. Is provided. The top plate 42 is a disc fixed to the cylinder body 41 so as to close the upper opening of the cylinder body 41, and a drain hose 400 is connectable to the center of the top plate 42. A drain port 42a for draining the drain water W that has been processed by the No. 14 is formed.

  In this case, the emulsion breaking sheet 43 is configured in the same manner as the emulsion breaking sheet 33 of the pretreatment filter 13, the oil adsorbing material 44 is configured in the same manner as the oil adsorbing material 34 of the pretreatment filter 13, and the nonwoven fabric 45 is It is comprised similarly to the nonwoven fabric 35 of the process filter 13. FIG. As an example, the partition plate 46 is formed with a number of holes that allow the drain water W to pass through a disc made of stainless steel. The partition plate 46 is biased in the emulsion breaking sheet 43, the oil adsorbing material 44, and the nonwoven fabric 45 filled in the container body constituted by the cylindrical body 41 and the top plate 42, or these are pushed out from the container body. It is made to engage with the inner wall surface of the cylinder 41 so as to prevent this.

  The pressure adjusting device 15 is configured integrally with a pressure adjusting valve, a drain filter, a drain trap, and a check valve (both not shown). This pressure adjusting device 15 collects the drain water W contained in the compressed air A exhausted from the exhaust port 26 of the gas-liquid separation tank 12 by a drain filter, and supplies it via a drain trap and a check valve. While supplying water to the pipe 300 and releasing the compressed air A in which the drain water W is collected from the pressure regulating valve to the atmosphere, the internal pressure (mainly, the compressed air pressure) of the gas-liquid separation tank 12 does not exceed the specified pressure. Adjust pressure to. The pressure regulating valve, the drain filter, the drain trap and the check valve are not limited to a configuration in which these are integrated, like the pressure regulating device 15 in the oil / water separator 1 of the present example, It is also possible to employ a configuration in which a pressure regulating valve, a drain filter, a drain trap, and a check valve that are separately configured are connected to each other and function in the same manner as the pressure regulating device 15.

  When installing the oil / water separator 1, first, the base 11 integrated with the outer cylinder 21 of the gas-liquid separation tank 12 is fixed at the installation location, and the supply pipe is connected to the inlet 25 of the gas-liquid separation tank 12. 300 is connected. In order to facilitate understanding of the assembling procedure, the emulsion breaking sheet 33, the oil adsorbing material 34 and the non-woven fabric 35 are filled in the pretreatment filter 13, and the emulsion breaking sheet 43 and the oil adsorbing material for the postprocessing filter 14. It is assumed that the filling operation of 44 and the nonwoven fabric 45 has already been completed. Next, the exhaust port 26 of the gas-liquid separation tank 12 and the drain filter of the pressure adjusting device 15 are connected to each other, and the check valve of the pressure adjusting device 15 and the supply pipe 300 are connected to each other.

  Subsequently, in a state where the connection pipe 23a of the partition plate 23 in the gas-liquid separation tank 12 is inserted into the drain port 32a of the lid 32 in the pretreatment filter 13 and the pretreatment filter 13 is attached to the partition plate 23, the pretreatment is performed. The partition plate 23 is placed on the flange 21 a of the outer cylinder 21 so that the container body 31 of the filter 13 is inserted into the inner cylinder 22 of the gas-liquid separation tank 12. Thereby, the attachment of the pretreatment filter 13 is completed. Next, the post-processing filter 14 with the flange 41a facing downward is placed on the partition plate 23 placed on the flange 21a of the outer cylinder 21, and the flanges 21a are sandwiched between the flanges 21a. , 41a are bolted. Thereby, the attachment of the post-processing filter 14 is completed, and the gas-liquid separation tank 12, the pre-processing filter 13, the post-processing filter 14, and the pressure adjusting device 15 are integrated. Thereafter, the drainage hose 400 is connected to the drain port 42a of the post-processing filter 14, whereby the installation of the oil / water separator 1 is completed.

  In the oil / water separator 1 thus installed, the drain water W generated by the separation of the mixed fluid WA between the outer cylinder 21 and the inner cylinder 22 in the gas-liquid separation tank 12 is separated into the gap 22a, the inner The inner space of the tube 22, the inlet 31 a of the pretreatment filter 13, the inside of the container body 31 (filled portion of the emulsion breaking sheet 33, the oil adsorbent 34 and the nonwoven fabric 35), the drainage port 32 a of the pretreatment filter 13, and the partition plate 23 It passes through the connecting pipe 23a and the cylinder 41 of the post-processing filter 14 (filled portion of the emulsion breaking sheet 43, the oil adsorbent 44 and the nonwoven fabric 45) in this order, and drains from the drain port 42a of the post-processing filter 14. A “drain water flow path” drained to the industrial hose 400 is formed. Therefore, by opening the valve 25v, the mixed fluid WA is supplied from the compressed air dehumidifier 200 to the oil / water separator 1 through the supply pipe 300, and thus passes through the "drain water flow path". In each process, the drain water W is purified.

  Specifically, when the mixed fluid WA in a state where the drain water W containing oil and dust and the compressed air A are mixed is supplied from the compressed air dehumidifier 200 through the supply pipe 300, this mixing is performed. The fluid WA is introduced from the introduction port 25 into the space between the outer cylinder 21 and the inner cylinder 22 in the gas-liquid separation tank 12. At this time, the drain water W heavier than the compressed air A in the mixed fluid WA moves downward, and the compressed air A lighter than the drain water W in the mixed fluid WA moves upward. In the space between the inner cylinder 22, the mixed fluid WA is separated into the drain water W and the compressed air A. In addition, since the oil contained in the drain water W is lighter than the water, a part of the oil contained in the drain water W separated from the mixed fluid WA (included in the mixed fluid WA in a relatively large oil droplet state). Oil etc.) separated from the drain water W in the space between the outer cylinder 21 and the inner cylinder 22.

  On the other hand, the drain water W from which a part of the oil is separated passes through the gap 22 a provided on the lower end side of the inner cylinder 22 and flows into the inner space of the inner cylinder 22. In this case, since the mixed fluid WA is pumped from the compressed air dehumidifier 200 through the supply pipe 300 and the gas-liquid separation tank 12 has a high pressure, the drain water W flowing into the inner cylinder 22 is pretreated. The filter 13 is introduced into the container body 31 through the inlet 31a. At this time, a part of the oil contained in the drain water W in an emulsified state is destroyed when passing through the emulsion breaking sheet 33 and separated into oil and moisture, and passes through the emulsion breaking sheet 33. Part of the oil contained in the drained water W is adsorbed and removed by the oil adsorbing material 34 and the nonwoven fabric 35 when passing through the filling portion of the oil adsorbing material 34 and the nonwoven fabric 35. As a result, the drain water W that has been subjected to the pretreatment (coarse treatment) by the pretreatment filter 13 is drained from the drain port 32a of the lid 32 into the connection pipe 23a of the partition plate 23 and directed toward the posttreatment filter 14. The separator 1 is moved.

  Further, the drain water W drained from the pretreatment filter 13 is introduced into the posttreatment filter 14 from the lower opening portion of the cylinder 41 and directed toward the drain port 42a (the direction of the arrow B shown in FIG. 1), the post-processing filter 14 is passed. Specifically, the drain water W introduced into the post-processing filter 14 passes through holes provided in the partition plate 46 and flows into the filling sites of the emulsion breaking sheet 43, the oil adsorbent 44 and the nonwoven fabric 45. . At this time, a part of the oil contained in the drain water W in an emulsified state is destroyed when passing through the emulsion breaking sheet 43 and separated into oil and moisture, and passes through the emulsion breaking sheet 43. The oil contained in the drained water W is adsorbed and removed by the oil adsorbent 44 and the nonwoven fabric 45 when passing through the filling portion of the oil adsorbent 44 and the nonwoven fabric 45. As a result, clean drain water W that has been subjected to post-processing (main processing) by the post-processing filter 14 is drained from the drain port 42a of the top plate 42 into the drain hose 400, and is drained from the drain hose 400 to the drain groove or the like. Drained. Thus, the drain water W purification process by the oil / water separator 1 is completed.

  On the other hand, in the oil / water separator 1, when the purification ability (oil adsorbing power) of the pretreatment filter 13 and the posttreatment filter 14 decreases due to long-term use, the pretreatment filter 13 and the posttreatment filter 14 are replaced with new ones. By exchanging with the pre-processing filter 13 or the new post-processing filter 14, the purification process of the drain water W can be executed again without carrying out the gas-liquid separation tank 12 or the pressure adjusting device 15 from the installation location. Has been. In order to facilitate understanding of the replacement method of the pre-processing filter 13 and the post-processing filter 14, the pre-processing filter 13 and the post-processing filter 14 having the reduced purification capacity are hereinafter referred to as the pre-processing filter 13A and the post-processing filter 14A. Alternatively, the new preprocessing filter 13 and the postprocessing filter 14 attached instead of the preprocessing filter 13A and the postprocessing filter 14A are also referred to as a preprocessing filter 13B and a postprocessing filter 14B.

  Specifically, first, in the state where supply of the mixed fluid WA from the supply pipe 300 to the gas-liquid separation tank 12 is stopped by closing the valve 25v, drainage is performed from the drain port 42a of the post-processing filter 14A. Remove the hose 400. Subsequently, the valve 24v provided in the connection pipe 23a of the partition plate 23 in the gas-liquid separation tank 12 is opened. At this time, the drain water W in the post-processing filter 14A flows back in the post-processing filter 14 due to its own weight, and is drained from the valve 24v to the outside of the oil-water separator 1. At this time, a container body such as a bucket is installed below the valve 24v to accommodate the drain water W so that the installation location of the oil / water separator 1 is not submerged by the drained drain water W. Subsequently, after closing the valve 24v, the post-processing filter 14A after the drainage of the drain water W is completed is removed from the partition plate 23 on the gas-liquid separation tank 12 (an example of a “removing step”).

  Next, the post-processing filter 14B is taken out from the transfer container 500 (see FIG. 2) containing the post-processing filter 14B to be attached instead of the post-processing filter 14A. In this case, the transport container 500 is a container for storing the new post-processing filter 14B when transporting the post-processing filter 14B to the installation location of the oil / water separator 1 or transporting the post-processing filter 14A to the disposal position. As shown in FIG. 2, as an example, a container main body 510 formed of a resin material in a top-opening box shape and a lid 520 made of a resin material that closes an opening portion of the container main body 510 are provided. Has been. Further, in the transport container 500, a post-processing filter 14B (or post-processing filter 14A: hereinafter referred to as “post-processing filter 14” when the post-processing filters 14A and 14B are not distinguished) is stored in the container body 510. A closing plate 550 that restricts the movement and closes about 2/3 of the opening in the cylinder 41 of the post-processing filter 14A when processing the drain water W in the gas-liquid separation tank 12 to be described later, and the post-processing filter 14 A spacer 560 that contacts the peripheral surface of the cylindrical body 41 and supports the post-processing filter 14 in the container body 510. In this case, the closing plate 550 is configured to be bolted to the flange 41 a of the post-processing filter 14.

  Subsequently, the blocking plate 550 is removed from the post-processing filter 14B taken out from the transfer container 500 and attached to the flange 41a of the post-processing filter 14A. Next, the post-processing filter 14 </ b> A after the attachment of the closing plate 550 is completed is accommodated in the container main body 510 (an example of “accommodation process”), and the post-processing filter in the drainage port 27 of the gas-liquid separation tank 12 and the container main body 510. The drain outlet 42a in 14A is connected to each other by a connection hose 600 (an example of “connection pipe”) (an example of “connection process”). In addition, although the example which connects the connection hose 600 after accommodating the post-processing filter 14A in the container main body 510 was demonstrated, before accommodating the post-processing filter 14A in 510, the drain port 27 and the drain port 42a are connected. The hoses 600 may be connected to each other.

  Next, the pretreatment filter 13A is removed from the outer cylinder 21 (flange 21a) together with the partition plate 23. At this time, the drain water W in the pretreatment filter 13A flows back through the pretreatment filter 13 due to its own weight and is drained into the inner cylinder 22 from the inlet 31a. Next, the pretreatment filter 13A is removed from the partition plate 23 and accommodated in a transfer container (not shown) or the transfer container 500, and as an example, the bucket 24V is removed from the valve 24v prior to the removal of the posttreatment filter 14A. The drain water W drained into a container body such as the like is poured into the gas-liquid separation tank 12. Thus, the removal work of the preprocessing filter 13A and the postprocessing filter 14A is completed.

  Subsequently, the pre-processing filter 13B and the post-processing filter 14B are attached. Since this attachment work is the same as the procedure at the time of the installation work of the oil / water separator 1 described above, a detailed description thereof will be omitted. In this case, a plug 450 for preventing entry of foreign matter from the drain port 42a is disposed at the drain port 42a of the post-processing filter 14B. Therefore, in the state where the attachment of the post-processing filter 14B in the state where the plug 450 is disposed in the drain port 42a is completed, as shown in FIG. 2, the gap 22a in the gas-liquid separation tank 12 (“the gas-liquid separation tank The element corresponding to the “water supply port”) is closed by the pretreatment filter 13B, the partition plate 23, and the posttreatment filter 14B (plug 450), and is transferred from the gas-liquid separation tank 12 to the pretreatment filter 13B and the posttreatment filter 14B. The flow of the drain water W toward is restricted (an example of a “blocking step”).

  Next, the drain water W stored in the gas-liquid separation tank 12 is processed. Specifically, the mixed fluid WA is introduced into the gas-liquid separation tank 12 from the inlet 25 through the supply pipe 300 by opening the valves 25v and 27v. At this time, the drain water W in the gas-liquid separation tank 12 is drained from the drain port 27 by the pressure applied to the mixed fluid WA. As a result, the “drain water W having a high oil concentration” stored in the gas-liquid separation tank 12 is pumped toward the post-processing filter 14 </ b> A in the container main body 510 through the connection hose 600. Further, the drained water W that has been pumped flows into the post-processing filter 14A from the drain port 42a and travels toward the opening of the cylindrical body 41 (portion closed by the closing plate 550) (arrow C shown in FIG. 2). Direction: an example of “second direction”), and is passed through the post-processing filter 14A.

  In this case, in the oil / water separator 1, as described above, with respect to the post-processing filter 14 attached to the gas-liquid separation tank 12, the direction from the opening in the cylinder 41 toward the drain outlet 42 a (see FIG. The configuration in which the oil contained in the drain water W is adsorbed by passing the drain water W in the direction of the arrow B shown in FIG. 1 (an example of “first direction”) is employed. Therefore, in the post-processing filter 14A, the oil adsorbing material 44 on the opening side of the cylindrical body 41 has a lower oil adsorbing power (purifying ability) than the oil adsorbing material 44 on the drain outlet 42a side. In other words, even when the purification capacity of the oil adsorbent 44 on the opening side in the cylindrical body 41 is reduced with use over a long period of time, the oil adsorbent 44 on the drain outlet 42a side is sufficiently oily. It has the purification ability to adsorb.

  Accordingly, the drain water W from the gas-liquid separation tank 12 is allowed to pass through the post-processing filter 14A in the “second direction” opposite to the “first direction” during normal use. The oil component contained in the drain water W is preferably adsorbed by the oil adsorbent 44 on the side. Thereby, the drain water W stored in the gas-liquid separation tank 12 before the removal of the pre-processing filter 13A and the post-processing filter 14A, and the pre-processing filter 13A and the post-processing filter before removal from the gas-liquid separation tank 12 are removed. The drain water W that has penetrated into 14A is purified by the post-processing filter 14A in the container body 510. Thus, the “purification process” is completed.

  It should be noted that most of the drain water W purified by the post-processing filter 14A in the “purification step” is impregnated in the post-processing filter 14A, and a large amount of drain water W is pumped from the gas-liquid separation tank 12. Even in such a case, the drain water W overflowing from the post-processing filter 14A is in a state of being accommodated in the container body 510. In this case, the drain water W that has been purified can be drained on the spot into a drain groove or the like, but in this example, when the post-processing filter 14A is transported to the disposal position as described later, The drain water W is also transported in a state of being accommodated in the transport container 500 together with the post-processing filter 14A.

  Next, after closing the valves 25v and 27v, the connecting hose 600 is removed from the drain port 27 and the drain port 42a in the post-processing filter 14A in the container body 510. Subsequently, the plug 450 is removed from the drain port 42a of the post-processing filter 14B, and the drain hose 400 (see FIG. 1) is connected. Thus, the replacement work at the installation location of the oil / water separator 1 is completed, and the oil / water separator 1 is ready for use. Thereafter, together with the removed pretreatment filter 13A, the posttreatment filter 14A accommodated in the transport container 500 is transported to a predetermined disposal processing place (an example of a “discarding processing position”) (an example of a “conveying step”).

  Subsequently, according to a predetermined procedure, the emulsion breaking sheets 33 and 43, the oil adsorbents 34 and 44 and the nonwoven fabrics 35 and 45 in the pretreatment filter 13A and the posttreatment filter 14A, and the container body 31 of the pretreatment filter 13A and The lid 32 is discarded. Specifically, as an example, the emulsion breaking sheets 33 and 43, the oil adsorbents 34 and 44, the nonwoven fabrics 35 and 45, the container body 31 and the lid body 32 taken out from the pretreatment filter 13A and the posttreatment filter 14A are separated. After volatilizing the water, incinerate at an appropriate incineration temperature (a temperature at which no harmful combustion gas is generated) (an example of a “disposal process”). Further, the drain water W accommodated and transported in the transport container 500 together with the post-processing filter 14A has been sufficiently purified by being passed through the post-processing filter 14A, so that the degree of purification is confirmed. After draining.

  Next, for the post-processing filter 14A from which the emulsion breaking sheet 43, the oil adsorbing material 44, the nonwoven fabric 45, and the like are taken out, after washing the cylindrical body 41, the top plate 42, and the partition plate 46, a new emulsion breaking sheet 43, oil adsorbing The material 44 and the nonwoven fabric 45 are filled in the cylinder 41 and remanufactured. Thereby, the cylinder 41, the top plate 42, and the partition plate 46 that can be continuously used by washing are reused as components of the new post-processing filter 14. Note that a transport container 500 (and a transport container 500a to be described later: see FIG. 3) used when transporting the post-processing filter 14A to the disposal position is also accommodated with a new post-processing filter 14 after washing. In this state, it is reused as a “conveying container”. Thus, the replacement work of the preprocessing filter 13 and the postprocessing filter 14 is completed.

  As described above, according to the drain water treatment method for the oil / water separator 1, the “removal process” for removing the post-processing filter 14 </ b> A from the partition plate 23 on the gas / liquid separation tank 12 and the drain in the gas / liquid separation tank 12. The “purification process” in which the water W is drained from the drain port 27 and is removed by passing through the post-processing filter 14A removed in the “removal process”, and the post-processing filter 14A that has completed the “purification process” is placed in the disposal position A “conveying process” for conveying and a “discarding process” for executing a predetermined disposal process at a disposal position in this order are performed in this order, and the gas-liquid separation tank is used by the used post-processing filter 14A to be disposed of. By purifying the drain water W in 12, without draining the drain water W in the gas-liquid separation tank 12 separately from the pre-processing filter 13A and the post-processing filter 14A, Since the drain water W that may contaminate the pretreatment filter 13B and the posttreatment filter 14B can be removed from the gas-liquid separation tank 12, immediately before the replacement operation is completed without causing an increase in running cost. A situation in which the useful life of the processing filter 13B and the post-processing filter 14B is shortened can be avoided.

  Further, according to the drain water treatment method for the oil / water separator 1, the “accommodating step” in which the removed post-treatment filter 14 </ b> A is accommodated in the transport container 500 (container body 510), the removed post-treatment filter 14 </ b> A and the drain port 27 is connected to each other by the connection hose 600, and the inlet 31a (that is, the gap between the gas-liquid separation tank 12) by the partition plate 23, the pretreatment filter 13B and the posttreatment filter 14B (plug 450). 22a: The “blocking step” for closing the “element corresponding to the“ water supply port of the gas-liquid separation tank ”” is executed prior to the “purification step”, and the introduction port 25 of the gas-liquid separation tank 12 in the “purification step”. The drainage water W in the gas-liquid separation tank 12 is pumped up by draining the drain water W in the gas-liquid separation tank 12 by introducing the mixed fluid WA from Power supply and the complicated operation of manually pumping up drain water W in the gas-liquid separation tank 12 are not required, and the components inherent in the oil / water separator 1 are added to the mixed fluid WA. Since the drain water W in the gas-liquid separation tank 12 can be pumped to the post-processing filter 14A and purified by the applied pressure, the cost required for the treatment of the drain water W can be sufficiently reduced. Further, since the purified drain water W is drained from the post-processing filter 14A into the transport container 500, it is possible to avoid a situation where the periphery of the post-processing filter 14A is immersed in the purified drain water W.

  Furthermore, according to the drain water treatment method for the oil / water separator 1, in the “purification process”, water is supplied to the removed post-treatment filter 14 </ b> A from the gap 22 a of the gas-liquid separation tank 12 through the pre-treatment filter 13. “Second direction (opening portion from the drain port 42a to the drain port 42a)” opposite to the “first direction (direction from the opening portion of the tube body 41 to the drain port 42a)” that allows the drain water W to pass through By allowing the drain water W to pass through in the “direction toward”), the drainage port 42a side (““ the purifying capacity is higher than the oil adsorbent 44 on the opening side (upstream side in the “first direction”) in the cylindrical body 41). The oil adsorbent 44 on the downstream side in the “first direction”, that is, the upstream side in the “second direction” reliably absorbs the oil contained in the drain water W in the gas-liquid separation tank 12 and drains it. Water W It can be purified.

  Next, another embodiment of the “drain water treatment method” will be described with reference to the accompanying drawings. In addition, about the structure of the oil-water separator 1 in which the drain water W of a process target is stored, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The drain water W stored in the gas-liquid separation tank 12 when the pre-processing filter 13A and the post-processing filter 14A are replaced is drained from the drain port 27 by the pressure applied to the mixed fluid WA introduced from the inlet port 25. The method of passing the post-processing filter 14A in the transport container 500 (container main body 510) has been described, but the drain water W in the gas-liquid separation tank 12 is passed through the post-processing filter in the transport container 500 (container main body 510). The method of liquid feeding to 14A is not limited to this. For example, the removed post-processing filter 14 </ b> A is accommodated in a conveyance container 500 a (see FIG. 3) in which the suction hole 515 is provided in the container main body 510 instead of the above-described conveyance container 500 (“accommodation process”). Other example). The series of work procedures up to the “accommodating step” and the “connecting step” are the same as the “filter replacement operation” described above, and thus detailed description thereof is omitted. Next, the pretreatment filter 13A is removed from the gas-liquid separation tank 12 and accommodated in a transfer container (not shown). As an example, the pretreatment filter 13A is drained from a valve 24v to a container such as a bucket prior to removal of the posttreatment filter 14A. The drain water W placed is poured into the gas-liquid separation tank 12. Thus, the removal work of the preprocessing filter 13A and the postprocessing filter 14A is completed.

  Subsequently, the drain water W stored in the gas-liquid separation tank 12 is processed. Specifically, the upper surface opening portion of the container body 510 in which the post-processing filter 14A has been accommodated is closed by the lid body 520, and a suction device (not shown) such as a business vacuum cleaner is shown in the suction hole 515. Connect. Next, while maintaining the state in which the valve 25v is closed, the valve 27v is opened and the suction device is operated. At this time, the air in the transfer container 500a is sucked from the suction hole 515 by the suction device, so that the drain water W in the gas-liquid separation tank 12 is passed through the post-processing filter 14A and the connection hose 600. It is sucked and drained from the drain port 27, and moves toward the post-processing filter 14A in the transport container 500a through the connection hose 600. Further, the drain water W flows into the post-processing filter 14A from the drain port 42a and heads toward the opening of the cylindrical body 41 (portion closed by the closing plate 550) (direction of arrow C shown in FIG. 3): Another example of “second direction”) is passed through the post-processing filter 14A.

  At this time, the drain water W from the gas-liquid separation tank 12 is allowed to pass through the post-processing filter 14A in the “second direction” opposite to the “first direction” during normal use. The oil contained in the drain water W is preferably adsorbed by the oil adsorbent 44 on the drain outlet 42a side. Thereby, the drain water W stored in the gas-liquid separation tank 12 before the removal of the pretreatment filter 13A and the posttreatment filter 14A and the pretreatment filter 13A and the posttreatment filter 14A were permeated before the removal. The drain water W is purified by the post-processing filter 14A in the transport container 500a. Thus, the “purification process” is completed. The purified drain water W is transported to the disposal position in a state of being accommodated in the transport container 500a together with the post-processing filter 14A in the same manner as the “filter replacement operation” described above.

  Next, after closing the valve 27v, the connecting hose 600 is removed from the drain port 27 and the drain port 42a in the post-processing filter 14A in the transport container 500a. Subsequently, the pre-processing filter 13B and the post-processing filter 14B are attached to the gas-liquid separation tank 12 in the same procedure as the “filter replacement operation” described above, and the plug 450 is removed from the drain port 42a of the post-processing filter 14B. The hose 400 is connected. Thus, the replacement work at the installation location of the oil / water separator 1 is completed, and the oil / water separator 1 is ready for use. Thereafter, the “conveying step” and the “discarding step” are executed in this order in the same manner as the “filter changing operation” described above, whereby the replacement operation of the preprocessing filter 13 and the postprocessing filter 14 is completed.

  As described above, according to the drain water treatment method for the oil / water separator 1, the “accommodating step” for accommodating the removed post-treatment filter 14 </ b> A in the transport container 500 a (container body 510), and the removed post-treatment filter 14 </ b> A. The “connection process” for connecting the water outlet 27 and the drainage port 27 to each other by the connection hose 600 is performed prior to the “purification process”, and in the “purification process”, air in the transfer container 500a is discharged from the suction hole 515. By sucking and draining the drain water W in the gas-liquid separation tank 12 through the post-processing filter 14A and the connecting hose 600, the drain water W in the gas-liquid separation tank 12 is manually pumped up. Without performing complicated operations, the components in the oil-water separator 1 and the suction device such as a vacuum cleaner are used, and the gas-liquid separator 12 It is possible to purify by sucking drain water W to the post-processing filter 14A, it is possible to sufficiently reduce the cost required for the treatment of drain water W. Further, since the purified drain water W is drained from the post-processing filter 14A into the transfer container 500a, it is possible to avoid a situation where the periphery of the post-processing filter 14A is flooded with the purified drain water W. Further, unlike the drain water treatment method in which the drainage water W in the gas-liquid separation tank 12 is drained and purified by introducing the mixed fluid WA from the inlet 25 of the gas-liquid separation tank 12, the gas-liquid separation tank 12. The drain water W in the gas-liquid separation tank 12 is purified by the post-processing filter 14A in the transfer container 500a while visually checking the state of the dirt in the container, or when the dirt in the gas-liquid separation tank 12 is severe, for example. Furthermore, this water can be purified by the post-processing filter 14A in the transport container 500a while supplying tap water or the like into the gas-liquid separation tank 12.

  Moreover, according to said drain water treatment method with respect to the oil-water separator 1, in a "purification process", it supplies water via the pre-processing filter 13 from the clearance gap 22a of the gas-liquid separation tank 12 with respect to the removed post-processing filter 14A. “Second direction (opening portion from the drain port 42a to the drain port 42a)” opposite to the “first direction (direction from the opening portion of the tube body 41 to the drain port 42a)” that allows the drain water W to pass through In the same manner as the drain water treatment method described above, the oil adsorbent on the opening side (upstream side in the “first direction”) of the tubular body 41 is obtained by passing the drain water W in the “direction toward the first direction”. The drain water W in the gas-liquid separation tank 12 is drained by the oil adsorbent 44 on the drain outlet 42a side (downstream side in the “first direction”, that is, upstream side in the “second direction”), which has a higher purification capacity than 44. Included in It is possible to purify the drain water W is reliably adsorb oil being.

  Next, still another embodiment of the “drain water treatment method” will be described with reference to the accompanying drawings. In addition, about the structure of the oil-water separator 1 in which the drain water W of a process target is stored, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  About the processing method which purifies the drain water W stored in the gas-liquid separation tank 12 when the pre-processing filter 13A and the post-processing filter 14A are replaced by the post-processing filter 14A in a state of being accommodated in the transfer containers 500 and 500a. Although demonstrated, the method of processing the drain water W in the gas-liquid separation tank 12 is not limited to this. For example, after the pre-processing filter 13A and the post-processing filter 14A are once removed from the gas-liquid separation tank 12, the gas-liquid separation tank is mounted in the gas-liquid separation tank 12 again as shown in FIG. The drain water W in 12 can be processed.

  Specifically, a cap 650 (an example of a “lid”) is attached to the connection pipe 23a for the gas-liquid separation tank 12 from which the pre-processing filter 13A and the post-processing filter 14A have been removed, and for connection. The partition plate 23 connected to the pipe 24 is attached (another example of the “blocking step”), and only the post-processing filter 14A is attached again (an example of the “attachment step”). In this case, as described above, the valve 24v is attached to the connecting pipe 24 connected to the connecting pipe 23a of the partition plate 23. In this example, as will be described later, the connecting pipe 24 and the valve 24v together function as a “drainage pipe”. Further, in a state where the partition plate 23 and the post-processing filter 14A are attached to the gas-liquid separation tank 12, the inlet 31a (that is, the gas-liquid separation tank 12) is provided by the partition plate 23 in which the cap 650 is attached to the connection pipe 23a. Crevice 22a: The element corresponding to the “water supply port of the gas-liquid separation tank” is closed.

  Next, the drainage port 27 of the gas-liquid separation tank 12 and the drainage port 42a of the post-processing filter 14A are connected to each other via the connection hose 600 (another example of the “connection process”). Subsequently, the drain water W stored in the gas-liquid separation tank 12 is processed. Specifically, the mixed fluid WA is introduced into the gas-liquid separation tank 12 from the introduction port 25 through the supply pipe 300 by opening the valve 25v while the valve 24v is opened. At this time, the drain water W in the gas-liquid separation tank 12 is drained from the drain port 27 by the pressure applied to the mixed fluid WA and is pumped toward the post-processing filter 14A via the connection hose 600. Further, the drained water W that has been pumped flows into the post-processing filter 14A from the drain port 42a and travels toward the opening of the cylindrical body 41 (portion closed by the partition plate 23) (arrow D shown in FIG. 4). Direction: another example of “second direction”), and is passed through the post-processing filter 14A.

  At this time, the drain water W from the gas-liquid separation tank 12 is allowed to pass through the post-processing filter 14A in the “second direction” opposite to the “first direction” during normal use. The oil contained in the drain water W is preferably adsorbed by the oil adsorbent 44 on the drain outlet 42a side. Thereby, the drain water W stored in the gas-liquid separation tank 12 before the removal of the pretreatment filter 13A and the posttreatment filter 14A and the pretreatment filter 13A and the posttreatment filter 14A were permeated before the removal. The drain water W is purified by the post-processing filter 14A. Thus, the “purification process” is completed.

  The purified drain water W flows down from the opening of the cylinder 41 in the post-processing filter 14A onto the partition plate 23, and the oil / water separator 1 through the connection pipe 23a, the connection pipe 24, and the valve 24v. Drained outside. Since this drain water W has been sufficiently purified by the post-processing filter 14A, it can be drained into the drain groove as it is. Further, the post-processing filter 14A and the pre-processing filter 13A that have completed the “purification process” are transported to the disposal position (conveying process) in the same manner as the “filter replacement operation” described above, and after the “disposing process”. Will be disposed of. The procedure for attaching the pre-processing filter 13B and the post-processing filter 14B to the gas-liquid separation tank 12 is the same as the “filter replacement operation” described above, and detailed description thereof is omitted. Thus, the replacement work of the preprocessing filter 13 and the postprocessing filter 14 is completed.

  As described above, in the drain water treatment method for the oil / water separator 1, the cap 650 is attached to the filter connecting portion (in this example, the partition plate 23 for connecting the opening in the cylinder 41 to the gas-liquid separation tank 12). “Clogging step” for closing the inlet 31a (that is, the gap 22a of the gas-liquid separation tank 12: an element corresponding to the “water supply port”) by disposing it, and connecting to the filter connecting portion (connecting pipe 23a). The pipe 24 and the valve 24v are connected and the post-processing filter 14A removed in the detaching process is attached to the filter connecting portion, and the post-processing filter 14A and the drain 27 are connected to each other by the connecting hose 600. The “connection process” is executed prior to the “purification process”, and the mixed fluid is introduced from the inlet 25 of the gas-liquid separation tank 12 in the “purification process”. The drain water W in the gas-liquid separation tank 12 is drained by introducing A, and the drain water W fed through the pretreatment filter 13 from the gap 22a of the gas-liquid separation tank 12 to the post-treatment filter 14A. “Second direction (direction from the drain port 42a toward the opening in the cylinder 41)” opposite to the “first direction (direction toward the drain port 42a from the opening in the cylinder 41)”. Let drain water W pass through.

  Therefore, according to this drain water treatment method, the power source for pumping up the drain water W in the gas-liquid separation tank 12 and the complicated work of pumping up the drain water W in the gas-liquid separation tank 12 are eliminated. The drain water W in the gas-liquid separation tank 12 is pumped to the post-processing filter 14A and purified by the pressure applied to the mixed fluid WA using the components that the oil / water separator 1 is originally equipped with. Therefore, the cost required for the treatment of the drain water W can be sufficiently reduced.

  The “drain water treatment method” is not limited to the method described above. For example, in the “closure step”, the method of closing the gap 22a (water supply port) of the gas-liquid separation tank 12 with the new pretreatment filter 13B, the partition plate 23, and the new posttreatment filter 14B has been described. In a state where the pretreatment filter 13A and the posttreatment filter 14A are removed, the cap 650 is disposed on the connection pipe 23a of the partition plate 23 removed from the gas-liquid separation tank 12, and then attached to the gas-liquid separation tank 12 again. A method of closing the gap 22a (water supply port) or a non-porous plate (not shown) having the same diameter as the partition plate 23 in place of the partition plate 23 removed from the gas-liquid separation tank 12 is provided in the gas-liquid separation tank 12. A method of closing the gap 22a (water supply port) by mounting can also be adopted. Even when such a method is adopted, it is possible to avoid a situation in which the useful life of the new pretreatment filter 13B and the posttreatment filter 14B is shortened in the same manner as the drain water treatment method described above.

  In addition, the method of passing the drain water W in the “second direction (direction toward the opening in the tubular body 41 from the drain port 42a)” with respect to the post-processing filter 14A has been described. For 14A, a method of passing the drain water W in a “first direction (a direction from the opening in the cylindrical body 41 toward the drain port 42a)” and processing it may be employed. Specifically, when the drain water W is processed in a state where the post-processing filter 14A is accommodated in the transport container 500 (or 500a), the connecting hose 600 can be connected instead of the closing plate 550 described above. In a state in which the entire area of the opening in the cylinder 41 of the post-processing filter 14A is closed by a simple closing plate (not shown), the drain water W from the connecting hose 600 is passed in the “first direction” to discharge the water. What is necessary is just to drain from 42a. Even when such a method is adopted, it is possible to avoid a situation in which the useful life of the new pretreatment filter 13B and the posttreatment filter 14B is shortened in the same manner as the drain water treatment method described above.

  Furthermore, although the method of supplying the drainage water W in the gas-liquid separation tank 12 to the post-processing filter 14A by the supply of the mixed fluid WA (pressure applied to the mixed fluid WA) or the suction force by the suction device has been described, A method of supplying the drain water W in the gas-liquid separation tank 12 to the post-processing filter 14A by supplying the compressed air A to the gas-liquid separation tank 12 instead of the fluid WA (by the pressure applied to the compressed air A). Can also be adopted. Further, instead of supplying the mixed fluid WA or the compressed air A, or the suction force by the suction device, for example, the drain water W in the gas-liquid separation tank 12 is pumped up by a water pump (not shown), and the post-processing filter 14A. It is also possible to employ a method of passing the water through the post-processing filter 14A by pumping up the drain water W in the gas-liquid separation tank 12 using a container such as a pump. Even when such a method is adopted, it is possible to avoid a situation in which the useful life of the new pretreatment filter 13B and the posttreatment filter 14B is shortened in the same manner as the drain water treatment method described above.

DESCRIPTION OF SYMBOLS 1 Oil-water separator 12 Gas-liquid separation tank 13 Pre-processing filter 14 Post-processing filter 22a Clearance 23 Partition plate 23a Connection piping 24 Connection piping 24v, 25v, 27v Valve 25 Inlet 26 Exhaust outlet 27 Drain outlet 41 Cylindrical body 42 Top Plate 42a Drain port 43 Emulsion breaking sheet 44 Oil adsorbent 45 Non-woven fabric 46 Partition plate 300 Supply pipe 400 Drain hose 450 Plug 500,500a Transport container 510 Container body 515 Suction hole 520 Cover body 550 Closure plate 600 Connection hose 650 Cap A Compressed air W Drain water WA Mixed fluid

Claims (5)

A gas-liquid separation tank that separates the mixed fluid in which drain water and compressed air are mixed into the drain water and the compressed air, and the drain water that is fed from a water feed port provided in the gas-liquid separation tank. A drain water treatment method for treating the drain water stored in the gas-liquid separation tank when the filter is replaced in a drain water treatment apparatus comprising a filter for purifying the drain water.
A removal step of removing the filter from a filter connection part for connecting the filter to the water supply port;
In the removal step, the drain water in the gas-liquid separation tank is drained from a drain port provided in the gas-liquid separation tank separately from the water supply port so that the drain water in the gas-liquid separation tank can be drained. A purification step of purifying the drain water by passing the removed filter;
A transport step for transporting the filter that has completed the purification step to a disposal position;
A drain water treatment method for executing in this order a disposal step of performing a predefined disposal process at the disposal process position.   A housing step for housing the filter in a transport container for transporting the filter in the transport step, a connection step for connecting the filter and the drain port removed in the removal step to each other by a connection pipe, and A closing step for closing the water supply port is performed prior to the purification step, and in the purification step, the mixing fluid is introduced into the gas-liquid separation tank from the introduction port provided in the gas-liquid separation tank so that the mixed fluid can be introduced. The drain water treatment method according to claim 1, wherein the drain water in the gas-liquid separation tank is drained by introducing a fluid.   A housing step of housing the filter in a transporting container for transporting the filter in the transporting step, and a connecting step of connecting the filter and the drain port removed in the removing step to each other by a connecting pipe. Prior to the purification step, in the purification step, the drain water in the gas-liquid separation tank is sucked through the filter and the connection pipe by sucking air in the transfer container. The drain water treatment method according to claim 1, wherein the drain water is drained.   In the purification step, the drain water is passed through the filter removed in the removal step in a second direction opposite to the first direction in which the drain water fed from the water feed port is passed. The drain water treatment method according to any one of claims 1 to 3.   A closing step for closing the water supply port by disposing a lid on the filter connecting portion, and an attachment for connecting the drain pipe to the filter connecting portion and attaching the filter removed in the removing step to the filter connecting portion. Prior to the purification step, and in the purification step, the mixed fluid can be introduced into the gas-liquid separation tank. By introducing the mixed fluid from the provided inlet, the drain water in the gas-liquid separation tank is drained, and the drain water supplied from the water inlet is allowed to pass through the filter. The drain water treatment method according to claim 1, wherein the drain water is passed in a second direction opposite to the direction.

Images