JP2008253969A - Method and apparatus for cleaning drain water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such problems that separation/removal of oil contained in drain water is carefully considered, but a technique for separating/removing copper, which is regulated by a country, is not considered at all and remarkable generation of copper ions when compressed air or the drain water, which is generated when steam in the compressed air is condensed, passes through an instrument composed of copper components is also not considered at all. <P>SOLUTION: An adsorption/removal tank 70, in which at least one of oil adsorption/removal layers 71w, 71y for adsorbing/removing oil and an adsorption/removal layer 71x for adsorbing/removing the copper ion are formed, is arranged in order to adsorb/remove both of the oil and copper ion contained in drain water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drain water purification treatment method and a purification treatment apparatus. More specifically, the present invention relates to copper ions contained in drain water generated by condensation of water vapor in compressed air. This is a description of a technique relating to a cleaning process and a cleaning apparatus for drain water to be removed by adsorption.

  As a technique related to a conventional drain water cleaning treatment method and a cleaning processing apparatus, as seen in a drain oil-water separator in an air compressor, after separating oil contained in drain water due to a specific gravity difference, There has been a technique for further adsorbing and removing oil fine particles mixed in water with an oil adsorbent (see, for example, Patent Document 1 and Patent Document 2).

In this case, Japanese Patent Application Laid-Open No. H10-228561 describes a technique that configures a sealed oil treatment tank that separates oil contained in drain water by a specific gravity difference and an oil adsorption tank in which an oil adsorbent is provided.
JP 61-1882

On the other hand, Patent Document 2 describes a technique that configures an oil / water separation tank in which an upper part for separating oil contained in drain water due to a specific gravity difference is opened and an oil adsorption tank in which an oil adsorbent is disposed. .
JP-A-5-60071

  However, such a conventional drain oil / water separator in an air compressor has the following problems.

  In other words, the oil contained in the drain water was separated and removed, but no consideration was given to the technology for separating and removing copper defined in the country.

  Naturally, in the case of drain water generated by the condensation of water vapor in the compressed air, the generation of copper ions is especially generated when the compressed air or the generated drain water passes through the equipment constituting the copper component. Although remarkable, in this case too little consideration was given.

  The present invention is characterized in that in the method for purifying drain water generated from compressed air, the copper ions contained in the drain water are adsorbed and removed. Further, as a method for adsorbing and removing copper ions, Further, it is characterized by passing through an adsorption removal layer 71x filled with chelate resin 74 or activated carbon or pumice that adsorbs and removes copper ions, and at least one of before and after in the adsorption removal layer 71x It is characterized in that it passes through the oil adsorption removal layers 71w, 71y for adsorbing and removing oil, and further, the drain water is generated in the refrigeration air dryer 20, Solved the above problem by separating and removing the oil contained in the drain water due to the difference in specific gravity before adsorbing and removing the copper ions. It is.

  The present invention also provides an apparatus for adsorbing and removing at least one layer of oil for the purpose of adsorbing and removing oil and copper ions contained in the drain water in a purification apparatus for drain water generated from compressed air. The adsorption / removal tank 70 in which the adsorption / removal layers 71x and 71y and the adsorption / removal layer 71x for adsorbing and removing copper ions are formed is disposed. Further, the drain traps 22 and 32 are sent together with drain water at intervals. By the action of compressed air, it is discharged as fresh water 203 in a sealed state until it is discharged as fresh water 203 through the adsorption / removal tank 70 or into the oil / water separation tank 60 in a state where the atmosphere is opened. The drain water is fed so as to secure the head H which is the difference from the height of the water to be absorbed. Further, the adsorption removal layer 71x is supplied with a chelate resin 74 or activated carbon. Is filled with pumice, and the oil adsorption / removal layers 71w, 71y are filled with a nonwoven fabric of polypropylene or polystyrene. In addition, oil separation tanks 50 and 60 for separating and removing the oil contained in the drain water due to the difference in specific gravity are disposed upstream of the adsorption removal tank 70. By solving this problem, the above-mentioned problems have been solved.

  As is clear from the above description, the present invention can provide the following effects.

  First, by adsorbing and removing copper ions contained in drain water generated by condensation of water vapor in compressed air, specifically, an adsorption removal layer filled with chelate resin, activated carbon or pumice is formed. By passing through, the copper ions are adsorbed and removed.

  Second, in addition to adsorbing and removing copper ions, the oil most contained in the drain water is passed through an oil adsorbing and removing layer that adsorbs and removes oil at least before and after the adsorbing and removing layer. Can be removed by adsorption.

  Thirdly, the drain water that is trying to adsorb and remove copper ions is the most effective removal of copper ions by removing the ones generated in the refrigeration air dryer where copper ions are believed to be most soluble. Adsorption removal became possible.

  Fourthly, before removing copper ions by adsorption, the oil most contained in the drain water is separated and removed due to the difference in specific gravity, thereby significantly extending the life of the oil adsorbent, which is a consumable product in the adsorption removal tank. It became possible.

  Fifth, by the action of compressed air that is sent out from the drain trap with drain water at intervals, until it is discharged as fresh water through the adsorption removal tank in a sealed state, or in an oil-water separation tank in a state where the atmosphere is open Purification of drain water containing copper ions without using other power such as an electric motor by sending drain water so as to secure the head, which is the difference between the height of the liquid level and the height discharged as fresh water Became possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is an example of a diagram showing the whole of the present invention, FIG. 2 is another example of the diagram showing the whole of the present invention, and FIG. 3 shows the whole of the present invention. It is another example of a figure.

  When the content of copper contained in the drain water generated by the condensation of water vapor in the compressed air was measured, nine measurement results were 4.8 mg / 1000 cc, 0.39 mg / 1000 cc, 0 .55mg / 1000cc, 2.6mg / 1000cc, 20mg / 1000cc, 0.39mg / 1000cc, 4.8mg / 1000cc, 0.55mg / 1000cc, 6mg / 1000cc You can see some things that have been exceeded.

  In this case, as various harmful substances defined in the country, the standard value of copper content is set to 3 mg / 1000 cc in the living environment items for the drainage standards.

  Therefore, in order to remove the copper ions contained in the drain water in response to such a situation, the following methods and apparatuses are summarized in the present invention.

(First embodiment)
As shown in FIG. 1, reference numeral 10 denotes an air compressor, which is not specifically shown, and is composed of an electric motor and a compressor, which transmits the rotation of the electric motor to the belt and transmits it to the compressor body. The air 201 is sucked to create compressed air.

  Here, the compressed air produced by the air compressor 10 includes compressed air piping 101, a refrigeration air dryer 20 that dries by cooling the compressed air, a compressed air piping 102, and a device 30 that generates drain water. The dry, clean compressed air can be supplied to various pneumatic devices constituting actuators such as an air motor and an air cylinder via the compressed air pipe 103.

  In this case, with respect to the refrigeration air dryer 20, copper may be used in a portion through which compressed air or drain water passes depending on the structure, and naturally, copper ions are likely to be generated.

  In addition, regarding the specific contents of the device 30 that generates drain water, an air tank that stores compressed air and a filter that removes various foreign matters such as dust removal and mist can be considered, but as long as drain water is generated. It is not limited to these devices. Moreover, it is not necessary to limit to one apparatus and you may think that the some apparatus is comprised.

  On the other hand, from the refrigerating type air dryer 20, the drain water pipe 121, the on-off valve 21 that can be manually opened and closed, the drain water pipe 122, and the operation and magnetic force of the motor are opened and closed so as to discharge drain water. Via an electric drain trap 22 that operates and discharges drain water together with compressed air, a drain water pipe 123, a check valve 23 that prevents the drain water from flowing backward from upstream to downstream, and a drain water pipe 124 Then, it is connected to the collecting pipe 191.

  Also, from the device 30 that generates drain water, the drain water pipe 131, the on-off valve 31 that can be manually opened and closed, the drain water pipe 132, and the operation and magnetic force of the motor so as to discharge the drain water. An electric drain trap 32 that opens and closes and discharges drain water together with compressed air, a drain water pipe 133, a check valve 33 that prevents the drain water from flowing backward from upstream to downstream, and a drain water pipe 134. It is connected to the collecting pipe 191 via. As a matter of course, when a plurality of devices 30 that generate drain water are configured, the same piping series is connected to the plurality of collecting pipes 191.

  It should be noted that drain water discharge in the drain traps 22 and 32 is always performed for an individually determined time in an individually determined cycle, or as an alternative, the drain trap 22 and the drain trap 22, For example, it may be possible to carry out for a predetermined time only when the presence or absence of drain water is confirmed at any position upstream of 32 and the presence of drain water is confirmed. At that time, if the presence of the drain water is further confirmed immediately after the drain water is drained, the drain water may be discharged for a predetermined time. In this case, the drain traps 22 and 32 may be electric types such as an electric motor type and an electromagnetic type.

  Here, the collecting pipe 191 in which all the drain water pipes 121, 122, 123, 124, 131, 132, 133, 134 gather is a check valve 91 that prevents the drain water from flowing backward from the downstream to the upstream. The fresh water 203 can be discharged from the fresh water pipe 199 after passing through the collecting pipe 192 and the drain water cleaning treatment device 7 for separating various foreign substances such as oil and dust and copper ions. . In this case, the fresh water 203 from the fresh water pipe 199 is clean enough to be discharged into a river or the like as it is.

  However, as shown in FIG. 1, the drain water cleaning treatment device 7 does not have to be limited to only one set, and may be two sets, three sets, or more. In that case, the drain water purification treatment apparatus 7 may be arranged in series or in parallel.

  By the way, the drain water purification processing device 7 is configured only by the adsorption removal tank 70, and the adsorption removal tank body 71 constituting the adsorption removal tank 70 is filled with nothing along the flow of fluid. The space portion 71z, the oil adsorption / removal layer 71w that adsorbs and removes oil, the adsorption / removal layer 71x that adsorbs and removes copper ions, the oil adsorption / removal layer 71y that adsorbs and removes oil, and the space portion 71z are formed. is doing.

  In this case, the space 71z is configured so that the fluid flows uniformly in the adsorption / removal tank main body 71 until drain water, which is liquid, flows into the adsorption / removal tank body 71 from the inflow port and flows out from the outflow port. They are formed on the inlet side and the outlet side, which are both ends of the adsorption removal tank main body 71.

  In addition, regarding the oil adsorption removal layers 71w and 71y, the oil adsorbent 72 with emulsion breaking particles to which the emulsion breaking particles intended to break the emulsion are adhered and the oil adsorbing material 73 intended to adsorb oil are mixed almost uniformly. Is placed before and after the adsorption removal layer 71x. However, the oil adsorption / removal layers 71w and 71y need not be positioned on both sides before and after the adsorption / removal layer 71x, and may be positioned only on either one of the front and rear sides of the adsorption / removal layer 71x.

  In this case, the oil adsorbent 72 with emulsion breaking particles releases the oil-water bond by breaking the drained water that has been emulsified by the action of the emulsion breaking particles to bind the fine oil to the water, and then separated. The oil thus absorbed is adsorbed by the oil adsorbent or the oil adsorbent 73 constituting the oil adsorbent 72 with emulsion breaking particles. Therefore, the oil adsorbent 72 with emulsion breaking particles and the oil adsorbent 73 are scattered, so that the oil can be removed by completely separating and adsorbing the oil from the emulsified oil.

  However, with regard to the oil adsorption removal layers 71w and 71y, even if only the oil adsorbent 73 is filled, a certain effect can be seen.

  Further, the adsorption removal layer 71x is filled with a chelate resin 74 that absorbs and removes copper ions, activated carbon, pumice, or the like. In particular, regarding the chelate resin 74 that adsorbs and removes copper ions. The polyamine type is effective.

  Here, the adsorption / removal tank main body 71 uses a transparent material such as glass or plastic that can visually check the internal situation from the outside, or glass or plastic so that the internal situation can be visually recognized from the outside. It is also conceivable to insert a transparent material such as.

  In addition, as a structure of the adsorption removal tank main body 71, in order to ensure the space part 71z of both ends, two porous plates 71c in which many small holes are formed are prepared, and the porous plate 71c and the adsorption removal tank main body are prepared. A cylindrical column 71d having a smaller diameter than the adsorption / removal tank main body 71 is disposed between both ends of the 71 to support the porous plate 71c, and the oil adsorbent 72 with emulsion breaking particles, the oil adsorbent 73, and copper. A chelate resin 74, activated carbon, or pumice that absorbs and removes ions is filled between the two porous plates 71c. However, the support column 71d is not necessarily limited to a cylindrical shape, and may have any shape as long as the space portion 71z can be secured. Further, as the perforated plate 71d, a punching plate in which many small holes are formed, a ceramic resin, or the like can be considered.

  In addition, the oil adsorbent 72 and the oil adsorbent 73 with emulsion breaking particles increase in resistance as they absorb foreign matters such as oil, and are pressed further toward the downstream while being compressed. The function of breaking oil and oil adsorption is surely reduced.

  Therefore, in order to prevent such a thing as much as possible, an intermediate perforated plate 71e in which a large number of small holes are formed in a substantially central portion of the adsorption removal tank main body 71 so that the liquid flow can be blocked vertically. In order to support and support the intermediate porous plate 71e, an oil adsorbent with emulsion breaking particles is provided by disposing a cylindrical column material 71f having a smaller diameter than the adsorption removal tank main body 71 between the intermediate porous plate 71e and the porous plate 71c. 72 and the oil adsorbent 73 are prevented from being compressed.

  However, the position of the intermediate porous plate 71e may be slightly around the center of the adsorption / removal tank main body 71. Further, the support material 71f need not be limited to a cylindrical shape, and may be any shape as long as it can support the intermediate porous plate 71e fixed by several bolts.

  In FIG. 1, the oil adsorbent 72 with emulsion breaking particles and the oil adsorbent 73 contain a substantially uniform mixture, but the oil adsorbent 72 with emulsion breaking particles and the oil adsorbent 73 are alternately arranged. It is also possible to store in layers.

  Here, as a method of making the oil adsorbent 72 with emulsion breaking particles in which the emulsion breaking particles are adhered to the oil adsorbent, a solution in which emulsion breaking particles such as amine and barium sulfate are dissolved in a solvent is used as the oil adsorbent. A method of evaporating and drying the solvent after the adhesion is common, but there is also a method of spraying the solution onto the oil adsorbent in a mist form. Further, a method of adhering to the oil adsorbent in a state where the emulsion breaking particles such as amine and barium sulfate are not uniformly dissolved but in a liquid is mixed.

  In this case, the emulsion breaking particles and the oil adsorbing material may be filled so as to be dispersed between the adsorbing materials without changing the state of the emulsion adsorbing material 72 with the emulsion breaking particles.

  On the other hand, with respect to the amine used in the present invention, an amine compound or a derivative thereof is conceivable, and it is preferable that the amine compound or the derivative thereof is solid when it is 25 ° C. Even if it is solid, it may be a compound that becomes a solid in a mixture with other compounds. That is, the compounds may be used alone or in combination of two or more.

  These amine compounds and derivatives thereof are preferably one amine, two amines, three amines, and derivatives thereof, more preferably one amine, two amines, and derivatives thereof. Preferably, it is a kind of amine (for example, stearylamine) and its derivatives.

  Moreover, what consists of a nonwoven fabric of a polypropylene or a polystyrene as the oil adsorbent used for the oil adsorbent 73 and the oil adsorbent 72 with emulsion breaking particles can be considered. However, the oil adsorbent used for the oil adsorbent 73 and the oil adsorbent 72 with emulsion breaking particles may be other as long as the oil adsorbs.

  Here, the size of the oil adsorbent used in the oil adsorbent 73 and the oil adsorbent 72 with emulsion breaking particles is preferably (10 mm to 200 mm) × (2 mm to 50 mm), More preferably, the size is (30 mm to 80 mm) × (5 mm to 40 mm). In particular, it is most preferable to prepare two types of sizes of (35 mm to 55 mm) × (25 mm to 40 mm) and (40 mm to 60 mm) × (3 mm to 10 mm). From another perspective, this can be said to be close to the idea of preparing two types of small pieces of 100 mm x 50 mm or less, 3 to 10 times different in area, It can be said that it is ideal to prepare two kinds of small pieces of 60 mm × 40 mm or less and different sizes 4 to 8 times in area.

  In this case, the reason why such a size is preferable is that when the oil adsorbing material used for the oil adsorbing material 73 and the oil adsorbing material 72 with emulsion breaking particles is filled in the adsorption / removal tank main body 71, it is too large. Since it is difficult to fill a large amount due to the large gap, it becomes difficult to obtain a large surface area, and because there are many parts that are forcedly compressed, such parts break down the emulsified oil And the function of adsorption is reduced, and the performance cannot be ensured by reducing the amount to be filled. Deterioration of the function is accelerated, and it is troublesome to cut, and it is troublesome to perform various management.

  In addition, the use of two types of sizes means that by preparing two types of small pieces of different sizes, adding small ones to the large gaps and unreasonable compression that are issues with increasing the size This makes it possible to make up for it, and at the same time, it has a great significance in that it can compensate for the early decline in function, which is a problem with making it smaller, by adding a large one.

  As for the two kinds of small pieces, it is best to use two kinds of small pieces for both the oil adsorbent 73 and the oil adsorbent used for the oil adsorbent 72 with emulsion breaking particles. 73 may be a small piece and the oil adsorbent used for the oil adsorbent 72 with emulsion breaking particles may be a large piece or vice versa.

  By the way, the chelating resin which adsorbs and removes the oil adsorbing material 73, the oil adsorbing material 72 with emulsion breaking particles, and the copper ions without being divided into three layers of the oil adsorbing and removing layers 71w and 71y and the adsorbing and removing layer 71x. It is also conceivable that all of 74, activated carbon, pumice or the like are mixed and filled.

  The drain water cleaning method and the cleaning device according to the present invention are configured as described above, and the operation thereof will be described below.

  First, when the electric motor constituting the air compressor 10 is operated, the rotation of the electric motor is transmitted to the belt and transmitted to the compressor, thereby generating compressed air. Here, the produced compressed air passes through a compressed air pipe 101, a refrigeration air dryer 20, a compressed air pipe 102, a device 30 for generating drain water, and a compressed air pipe 103, and an air motor or air at the tip thereof. Dry compressed air can be sent out to actuators such as cylinders as needed.

  On the other hand, the drain water generated from the compressed air in the refrigeration air dryer 20 or the device 30 that generates drain water together with the compressed air, the drain water pipes 121 and 131, the on-off valves 21 and 31, the drain water pipes 122 and 132, and the drain trap. 22 and 32, drain water pipes 123 and 133, check valves 23 and 33, and drain water pipes 124 and 134 are joined to the collecting pipe 191, and further via the check valve 91 and the collecting pipe 192, Various foreign matters including oil, dust, and copper ions are removed and sent to the water purification treatment device 7 to obtain clean fresh water 203 that does not have any problem even if discharged from the fresh water pipe 199 to the river as it is. It is like that.

  In this case, the force of the compressed air is used until the drain water becomes fresh water 203 and is discharged from the fresh water pipe 199 because the adsorption removal tank 70 which is the drain water purification treatment device 7 is in a sealed state. , Help drain water move.

  On the other hand, in the adsorption removal tank 70, the drain water fed together with the compressed air is in a state where the oil adsorbent 72 with emulsion breakage particles to which the emulsion breakage particles are adhered and the oil adsorbent 73 adsorbing oil are mixed almost uniformly. By filling the oil adsorbent 72 with emulsion breaking particles and the oil adsorbing material 73 at random while being filled, the oil adsorbent 72 with emulsion breaking particles releases the water-oil bond of the emulsified oil. Emulsion breakage is performed, and the separated oil is adsorbed. The oil adsorbent 73 adsorbs oil that could not be adsorbed by the oil adsorbent 72 with emulsion breakage particles. The cleanliness of water will improve.

  In the adsorption removal layer 71x, copper ions are adsorbed and removed by the chelate resin 74, activated carbon, or pumice that is filled.

(Second embodiment)
As shown in FIG. 2, reference numeral 5 denotes a drain water cleaning treatment apparatus, which mainly includes an oil / water separation tank 50 and an adsorption removal tank 70.

  In this case, the second embodiment is different from the first embodiment in that, in the first embodiment, as shown in FIG. 1, the collecting pipe 192 and the drain water cleaning treatment device 7 are configured. The portion is that the collecting pipe 193 and the drain water cleaning treatment device 5 are configured as shown in FIG. 2 in the second embodiment.

  By the way, the drain water purification treatment device 5 is an oil / water separation tank 50 that separates oil contained in the drain water due to a difference in specific gravity, a connection pipe 194, and a reverse that prevents the drain water from flowing backward from upstream to downstream. The stop valve 92, the connecting pipe 198, and the adsorption removal tank 70 are comprised. The adsorption removal tank 70 is the same as that described in the first embodiment.

  And the oil-water separation tank 50 forms two chambers, the oil floating separation chamber 51x located on the outside and the water storage tank chamber 51y located on the inside by the oil-water separation tank body 51 being partitioned by the partition wall 51d. The inside of the sealed oil / water separation tank main body 51 is in a state in which only compressed air, which is a gas, can freely enter and exit between the oil floating separation chamber 51x and the water storage chamber 51y at the upper part above the liquid level in the upper part. In the lower part, the drain water, which is liquid, can freely enter and exit between the oil floating separation chamber 51x and the water storage chamber 51y between the tip of the partition wall 51d and the bottom of the oil / water separation tank body 51.

  In this case, in the oil floating separation chamber 51x, there is located a suction pipe 51b in which one pipe end protrudes from the liquid level and the other pipe end is connected to the collecting pipe 193, and drain water flows. It is like that. Therefore, in the oil floating separation chamber 51x, oil lighter than water floats on the liquid surface, and foreign matters heavier than water settle on the bottom. Thus, the oil floating on the liquid surface can be discharged by opening the floating oil take-off valve 53.

  On the other hand, in the water storage chamber 51y, one end of the discharge pipe 51c is positioned on the liquid surface, the tip of the lower partition 51d between the oil floating separation chamber 51x and the water storage chamber 51y, and the bottom of the oil / water separation tank body 51. The drain water from which the oil lighter than water and the foreign material heavier than water were removed flows in from the communicating part. However, the emulsified oil was dissolved in the drain water, and there was a possibility that it could not be separated by such a method and could flow as it was.

  Here, the other pipe end of the discharge pipe 51 c is connected to the connection pipe 194. Accordingly, the relatively clean drain water from which oil is removed located above the one end of the discharge pipe 51c collected on the liquid surface of the water storage chamber 51y is divided into the oil floating separation chamber 51x and the water storage chamber 51y. The pressure of compressed air that is sealed in communication with the air enters from one end of the discharge pipe 51c and is sent out together with the compressed air from the other end to the connecting pipe 194. A pressure gauge 52 is provided on the upper part of the oil / water separation tank main body 51 so that the pressure of compressed air in the upper part of the oil floating separation chamber 51x and the upper part of the water storage tank chamber 51y can be confirmed. It is also conceivable to arrange a relief valve on the upper part of the oil / water separation tank main body 51 so that the pressure of the compressed air in the upper part of the oil floating separation chamber 51x and the upper part of the water storage tank 51y does not exceed a certain pressure.

  By the way, on the outer periphery of the oil / water separation tank main body 51, as seen in FIG. 2, a transparent transparent tube 51a that is positioned in the vertical direction and communicates at four locations including the upper and lower ends of the oil / water separation tank main body 51. Is forming. In this case, the purpose of the transparent tube 51a is to confirm the state of contamination of the drain water in the oil floating separation chamber 51x immediately after flowing into the oil floating separation chamber 51x by visual observation or optical means. Therefore, the transparent tube 51a can be made of a transparent material such as glass or plastic.

  In addition, about the communicating part of the transparent pipe 51a and the oil-water separation tank main body 51, it is not necessary to be limited to four places, and it may be two places, three places, five places, or more. Further, as a means for confirming the contamination status, an optical method of irradiating light and making a judgment based on transmitted light or reflected light is conceivable.

  Further, the oil floating on the liquid surface of the oil floating separation chamber 51 can be removed to the outside by opening the floating oil take-off valve 53.

  The drain water cleaning method and the cleaning device according to the present invention are configured as described above, and the operation thereof will be described below.

  First, the process is the same as in the first embodiment until the clean and clean compressed air 202 is discharged from the compressed air pipe 103 and until the drain water reaches the check valve 91 via the collecting pipe 191. The description is omitted.

  Here, the drain water reaching the check valve 91 is sent to the drain water cleaning treatment device 5 via the collecting pipe 193 to remove various foreign matters including oil, dust and copper ions, and the fresh water pipe It is possible to obtain clean fresh water 203 that does not cause any problems even if it is discharged from 199 into the river as it is.

  In this case, since the oil / water separation tank 50 and the adsorption / removal tank 70 constituting the drain water purification treatment device 5 are sealed together, the drain water becomes the fresh water 203. Until the water is discharged from the fresh water pipe 199, it helps to move the drain water.

  By the way, the drain water sent to the oil / water separation tank 50 is floated in the oil floating separation chamber 51x forming the oil / water separation tank 50. The relatively clean drain water from which oil and various foreign substances have been removed passes between the tip of the partition wall 51d formed between the oil floating separation chamber 51x and the water storage chamber 51y and the bottom of the oil / water separation tank body 51. It is sent to the storage chamber 51y. However, there is a possibility that the oil which is dissolved in the drain water and emulsified is mixed.

  On the other hand, the compressed air sent to the oil / water separation tank 50 together with the drain water stays in a sealed portion between the upper part of the oil floating separation chamber 51x and the upper part of the water storage tank 51y. . Dirty drain water immediately after being fed into the oil / water separation tank 50 by the transparent transparent pipe 51a located outside the oil / water separation tank body 51 and communicating with the oil floating separation chamber 51x of the oil / water separation tank body 51, It is possible to check the state of dirt by a method such as visual inspection. Further, the oil floating on the liquid surface of the oil floating separation chamber 51x can be removed to the outside by opening the floating oil take-off valve 53.

  Here, the drain water sent into the water storage chamber 51y stays in the upper part of the oil / water separation tank main body 51 when it accumulates above the pipe end which is one end of the discharge pipe 51c formed in the water storage chamber 51y. The compressed air is discharged as fresh water 203 from the fresh water pipe 199 via the discharge pipe 51c, the connecting pipe 194, the check valve 92 and the connecting pipe 198, and further via the adsorption removal tank 70. It has become.

  Since the operation in the adsorption removal tank 70 is the same as that in the first embodiment, description thereof is omitted.

  That is, the second embodiment is greatly different from the first embodiment in that the oil / water separation tank 50 for separating and removing the oil contained in the drain water due to the difference in specific gravity is located upstream of the adsorption removal tank 70. It is.

(Third embodiment)
As shown in FIG. 3, reference numeral 6 denotes a drain water purification treatment apparatus, which mainly includes an oil / water separation tank 60 and an adsorption removal tank 70.

  In this case, the third embodiment is different from the first embodiment in that, in the first embodiment, as shown in FIG. 1, the collecting pipe 192 and the drain water cleaning treatment device 7 are configured. The portion is that the collecting pipe 195 and the drain water cleaning treatment device 5 are configured as shown in FIG. 3 in the third embodiment.

  By the way, the drain water cleaning treatment device 6 is composed of an oil / water separation tank 60 for separating oil contained in the drain water due to a difference in specific gravity, a connecting pipe 196, and an adsorption removal tank 70. The adsorption removal tank 70 is the same as that described in the first embodiment.

  The oil / water separation tank 60 is composed of an oil / water separation tank main body 61 and a discharge pipe 62, the upper part is open to the atmosphere, and the drain water sent to the oil / water separation tank 60 is water on the liquid surface. Lighter oil floats up and foreign matter heavier than water settles at the bottom, and drain water that is trying to accumulate above the branched discharge part of the discharge pipe 62 flows from the lower part of the discharge pipe 62, The discharge pipe branched as relatively clean drain water is always fed into the connecting pipe 196.

  Here, the height of the position of the branched discharge part from which drain water flows out from the discharge pipe 62 of the oil / water separation tank 60 is connected to the outlet formed in the adsorption removal tank 70 installed downstream thereof. By securing the head H between the fresh water pipe 199 and the highest position of the fresh water pipe 199, the drain water flowing out of the oil / water separation tank 60 does not require power, and the adsorption / removal tank is used as the fresh water 203 from the fresh water pipe 199. It is possible to flow out from 70.

  However, in this case, a part of the water may be discharged into the adsorption / removal tank 70 without being completely separated into water and oil by the oil / water separation tank 60 in a state where water and oil are combined as part of the emulsified drain water. It is possible.

  Although not specifically shown, the oil floating on the liquid level can be removed by opening the floating oil take-off valve slightly below the liquid level. The upper part of the discharge pipe 62 is open to the atmosphere.

  The drain water cleaning method and the cleaning device according to the present invention are configured as described above, and the operation thereof will be described below.

  First, the process is the same as in the first embodiment until the clean and clean compressed air 202 is discharged from the compressed air pipe 103 and until the drain water reaches the check valve 91 via the collecting pipe 191. The description is omitted.

  Here, the drain water reaching the check valve 91 is sent to the drain water purification treatment device 6 via the collecting pipe 195 to remove various foreign matters including oil, dust and copper ions, and the fresh water pipe It is possible to obtain clean fresh water 203 that does not cause any problems even if it is discharged from 199 into the river as it is.

  In this case, the oil / water separation tank 60 constituting the drain water purification treatment device 6 is open to the atmosphere by the force of the compressed air fed together with the drain water, and the collecting pipe From 195, drain water can be fed into the oil / water separation tank 60.

  By the way, the drain water sent from the collecting pipe 195 to the oil / water separation tank 60 constituting the adsorption / removal tank 70 floats lighter oil than water on the liquid surface and precipitates various foreign substances heavier than water on the bottom, From the lower part of the discharge pipe 62, it passes through the branch part and is sent to the adsorption removal tank 70 via the connection pipe 196. However, in many cases, this drain water is emulsified to be in a state where water and oil are combined and fed into the adsorption removal tank 70.

  Since the operation in the adsorption removal tank 70 is the same as that in the first embodiment, description thereof is omitted.

  That is, the third embodiment is greatly different from the first embodiment in that the oil / water separation tank 60 for separating and removing the oil contained in the drain water due to the difference in specific gravity is located upstream of the adsorption removal tank 70. It is.

  The present invention relates to a drain water purification treatment method and a purification treatment apparatus, and in particular, an attempt is made to remove copper contained in the country as much as possible to obtain clean water.

  An example of a diagram showing the whole of the present invention   Another example of the figure showing the whole of the present invention   Still another example of the figure showing the whole of the present invention

Explanation of symbols

5 .... Drain water purification treatment device 6 .... Drain water purification treatment device 7 .... Drain water purification treatment device 10 .... ··· Air compressor 20 ··· Refrigeration air dryer 21 · · · Open / close valve 22 · · · Drain trap 23 · · · Check valve 30 ··· Equipment 31 that generates drain water ... Open / close valve 32 ... Drain trap 33 ... Check valve 50 ... Oil / water separation tank 51 ...・ Oil / water separation tank main body 51a ... transparent pipe 51b ... suction pipe 51c ... discharge pipe 51d ... partition wall 51x ... oil floating separation chamber 51y ... ..Water storage chamber 52 .... Pressure gauge 53 ... Floating oil take-off valve 60 ... Oil water separation tank 61 ... Oil Separation tank body 62... Discharge pipe 70... Adsorption removal tank 71... Adsorption removal tank body 71 c .. Perforated plate 71 d. ... Intermediate porous plate 71f ... Still plate 71w ... Oil adsorption removal layer 71x ... Adsorption removal layer 71y ... Oil adsorption removal layer 71z ... Space 72 ··· Oil adsorbent 73 with emulsion breaking particles ··· Oil adsorbent 74 · · · Chelate resin 91 · · · Check valve 92 ··· .... Check valve 101 ... Compressed air piping 102 ... Compressed air piping 103 ... Compressed air piping 121 ... Drain water piping 122 ... Drain water piping 123 ... Drain water pipe 124 ... Drain water pipe 131 ... Drain water pipe 132 ... Drain water pipe 133 ... Drain water pipe 134 ... Drain water pipe 191 ... Collecting pipe 192 ... Collecting pipe 193 ... Collecting pipe 194 ...・ Connection pipe 195... Collection pipe 196... Connection pipe 198... Connection pipe 199... Fresh water pipe 201. Clean compressed air 203 ... Shimizu H ... water head

Claims (10)

  In the method for cleaning drain water generated from compressed air, copper ion contained in the drain water is adsorbed and removed.   The method of adsorbing and removing the copper ions is characterized by passing through a chelating resin (74) that adsorbs and removes the copper ions, or an adsorption removal layer (71x) filled with activated carbon or pumice. The method for purifying drain water according to claim 1.   The drain water cleaning according to claim 2, wherein the water is passed through an oil adsorption / removal layer (71w, 71y) that adsorbs and removes oil at least before and after the adsorption / removal layer (71x). Processing method.   The drain water purification method according to any one of claims 1 to 3, wherein the drain water is generated in a refrigeration air dryer (20).   The drain water purification process according to any one of claims 1 to 4, wherein oil contained in the drain water is separated and removed by a specific gravity difference before the copper ions are adsorbed and removed. Method.   In an apparatus for purifying drain water generated from compressed air, an oil adsorption removal layer (71w) that adsorbs and removes at least one layer of oil for the purpose of adsorbing and removing oil and copper ions contained in the drain water. 71y) and an adsorption removal tank (70) in which an adsorption removal layer (71x) for adsorbing and removing copper ions is disposed.   The air is released until it is discharged as fresh water (203) through the adsorption removal tank (70) in a sealed state by the action of compressed air sent out from the drain trap (22, 32) together with drain water at intervals. The drain water is fed into the oil-water separation tank (60) in a state of being discharged so as to secure a water head (H) which is a difference between the height of the liquid level and the height discharged as the fresh water (203). Item 7. A drain water cleaning treatment apparatus according to Item 6.   The adsorption removal layer (71x) is filled with a chelate resin (74) or activated carbon or pumice, and the oil adsorption removal layer (71w, 71y) is filled with a nonwoven fabric of polypropylene or polystyrene. The apparatus for purifying drain water according to claim 6 or 7, wherein:   The drain water purification process according to any one of claims 6 to 8, wherein drain water is connected from the refrigeration air dryer (20) to the adsorption removal tank (70) so as to flow. Method.   The oil separation tank (50, 60) for separating and removing the oil contained in the drain water due to the difference in specific gravity is disposed upstream of the adsorption removal tank (70). The drain water purification method according to any one of the above.

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