JP4125810B2 - Oil / water separator and oil / water separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for separating oil water, which is industrial waste water mixed with lubricating oil, into water and oil, and an apparatus for removing oil from the waste water.
[0002]
[Prior art]
As this type of device, oil water is allowed to stand and float to the upper layer due to the difference in specific gravity to separate oil droplets, oil water is absorbed and separated through an adsorbent tank, or fine oil droplets are used. An apparatus that separates an emulsion that has passed through an electrolytic treatment tank by electrophoresis using an interface potential difference between oil droplets and water is used.
[0003]
Each of these devices has advantages and disadvantages, and is used properly according to the required separation accuracy. However, in recent years, a separation device with higher accuracy is desired from the viewpoint of preventing environmental pollution. In order to achieve this purpose, treated water after separating the oil droplets by the difference in specific gravity is introduced into the bottom of the adsorption tank containing the oil adsorbent using pressurized air, and the water discharged from the top is separated. An apparatus for discharging as treated water is disclosed. (For example, see Japanese Patent Publication No. 63-39799).
[0004]
If the adsorbent functions sufficiently, the oil adsorption processing apparatus has a simple structure and excellent separation accuracy. However, the adsorbent generally has a drawback that it is difficult to maintain the adsorptive power over a long period of time, and it often requires replacement. Since the conventional adsorption separation device releases the oil adsorbent layer by passing it once, the oil adsorbent separation is insufficient, or the oil water passing through the adsorbent short-circuits the adsorbent layer. There are disadvantages such as insufficient contact efficiency between the adsorbent and the oil water. Furthermore, if the load of the oil to be adsorbed is large, the life of the adsorbent is shortened. In particular, in the case of an adsorbent made of a porous material such as activated carbon, frequent replacement of the adsorbent is necessary. There is a drawback that maintenance is complicated and expensive.
[0005]
【task to solve】
A first object of the present invention is to disclose an oil / water separation device and an oil / water separation method in which the separation capacity of the adsorbent (agent) lasts long because the load on the adsorption / separation device is small.
The second object of the present invention is to disclose an oil / water separation device and an oil / water separation method in which the contact efficiency between the adsorbent and the oil / water in the adsorption / separation device is high and the oil separation accuracy is high.
The third object of the present invention is to maintain the adsorption capacity of the adsorbent in the final block by dividing the adsorbent to be contacted with the oil and water into a plurality of blocks and always allowing the oil and water to pass through the block. Accordingly, an oil / water separation apparatus and an oil / water separation method capable of highly accurate oil / water separation are disclosed.
A fourth object of the present invention is to disclose an oil / water separation apparatus and method having high separation performance and low maintenance burden by combining the steps of oil / water separation in a balanced manner.
[0006]
[Means for solving problems]
The first gist of the present invention is a floating oil separating means comprising a storage tank provided with an oil water inlet and a separation water discharge pipe, and an aluminum in the electrolytic tank connected to the storage tank through the discharge pipe. Electrolytic separation means containing an electrode, and adsorption separation means having an adsorption treatment chamber containing an adsorbent inside and having an inlet and an outlet for electrolytically treated water treated by the electrolytic separation means It is in the oil-water separator characterized by having.
[0007]
In the present application, the aluminum electrode is used to include an electrode made of an aluminum alloy. The above apparatus receives oil water in a storage tank and leaves it standing, and floats and separates oil droplets due to a difference in specific gravity. Since the specific gravity difference with water is small, the emulsion-like oil droplets that could not be separated by the floating oil separating means enter the electrolytic cell through the discharge pipe. In the electrolytic cell, aluminum hydroxide having high activity is generated in the electrolytic solution by using the aluminum electrode for the anode. The emulsion introduced between the yin and yang electrodes breaks the O / W emulsion by electrophoretic action to separate fine oil droplets, and the separated oil droplets are aggregated by aluminum hydroxide and float between the electrodes. Hydrogen bubbles generated from the cathode also help this rise.
[0008]
The separated and floating oil droplets are scum-like. This scum is removed by appropriate means such as scraping, overflow, and suction. The electrolytically treated water discharged from the electrolytic separation means is adsorbed by being introduced into an adsorption treatment chamber containing a porous adsorbent and an adsorbent that selectively adsorbs oil by having both hydrophobic and lipophilic properties. In contact with the material, the oil is removed and discharged as clean water. Since most of the oil contained in the wastewater is almost removed by the gravity separation process and the electrolytic separation process, the oil load on the adsorbent is small and the life of the adsorbent is extended. The flow of electrolyzed water flows from the upper part of the adsorption treatment chamber, when the electrolytic treatment water flows in, falls between the adsorbents by gravity and flows out from the lower part of the adsorption treatment chamber, and conversely, when it flows out from the bottom to the top and so on.
[0009]
According to a second aspect of the present invention, there is provided a floating oil separating means comprising a storage tank provided with an oil water inlet and a separation water discharge pipe, and aluminum in the electrolytic tank connected to the storage tank via the discharge pipe. Electrolytic separation means containing electrodes, and one or more adsorption processing chambers having gas / liquid entrances and containing adsorbents inside are connected vertically to form a series of gas-liquid flow paths. An adsorption separation means, and a pressurized air supply means and a pressure feed means for electrolytic treatment water from the electrolytic cell are connected to the oil adsorption treatment chamber located at the bottom of the one or more adsorption treatment chambers And an adsorption / separation means.
[0010]
In the apparatus of the second aspect, the electrolytic treatment water pressure feeding means includes a case where the electrolytic treatment liquid is pumped into the adsorption treatment chamber due to a difference in water level from the electrolytic treatment water adsorption treatment chamber or a liquid pressure feed pump. In the adsorption treatment chamber, the contact efficiency between the adsorbent and the electrolytic treatment water is improved by stirring the air and the electrolytic treatment water with pressurized air.
[0011]
According to a third aspect of the present invention, in the oil / water separator defined by the second aspect, a plurality of adsorption processing chambers are connected to a lower part of an upright cylindrical container connected with pressurized air supply means and electrolytic treatment water pressure feeding means. It comprises a partition that defines a plurality of spaces in the vertical direction, and an adsorbent housed in each of the spaces, the partition having a baffle A having an opening in the center and an opening of the baffle A And the baffle B having a plurality of openings at positions that do not face each other.
[0012]
The partition composed of the baffle A and the baffle B promotes the gas-liquid mixing effect and bubble generation effect that pass through the partition. When the electrolytically treated water rich in bubbles protruding from the partition enters the adsorbent layer, it receives more passage resistance, and this passage resistance acts on the adsorbent, causing the adsorbent to move up and down. Move to the left and right to help contact with the electrolyzed water. Thereby, the bias of the adsorption action due to the position of the adsorbent is prevented, and the adsorption efficiency is improved as a whole. The mode of the stirring state of the adsorbent and the electrolytically treated water can be selected depending on the amount of the airflow to be injected. Further, the stirring mode can be changed variously depending on the ratio of the opening area of the baffles A and B.
[0013]
The fourth gist of the present invention is that the oil water is received in a storage tank and allowed to stand, and oil droplets are floated and separated due to a difference in specific gravity, and then water in the lower layer of the storage tank is supplied to an electrolytic separation tank equipped with an aluminum electrode. Introduced and electrolyzed, separated oil droplets are agglomerated and separated by aluminum hydroxide generated in the electrolyzed water, separated and removed, and then the obtained electrolyzed water passed through an adsorption tank containing an adsorbent In the oil-water separation method,
[0014]
The fifth gist of the present invention is that the oil water is received in a storage tank and allowed to stand, and after the oil droplets are floated and separated due to the difference in specific gravity, the water under the storage tank is separated into an electrolytic separation tank equipped with an aluminum electrode. Introduced and electrolytically treated, separated oil droplets are agglomerated and separated by aluminum hydroxide produced in the electrolytically treated water, separated and removed, and then the obtained electrolytically treated water is adsorbed to the adsorption treatment chamber equipped with a gas-liquid distribution port. Introducing the adsorbent into the adsorbing tank and introducing pressurized air into the electrolytically treated water in the adsorbing tank so that the electrolytically treated water passes through the adsorbing tank while being stirred with the adsorbent. The oil-water separation method is characterized by that.
[0015]
A sixth aspect of the present invention is the oil-water separation method defined by the fifth aspect, wherein the adsorption tank is partitioned by one or more partitions having a gas-liquid inlet / outlet, so that the inlet / outlet overlaps in the vertical direction. It is equipped with a plurality of adsorption treatment chambers that are connected in series, and the electrolytic treatment water and pressurized air introduced into the adsorption tank are moved from the lowest adsorption treatment chamber to the upper adsorption treatment chamber sequentially. It is in the oil-water separation method characterized by the above-mentioned.
[0016]
In the above, as a partition, the cylindrical thing comprised by the above-mentioned baffle A and the baffle B, the thing using the baffles A and B alone, or innumerable linear through-holes are formed. In addition, a suitable combination of plate-like bodies can be used.
[0017]
The seventh gist of the present invention is the fourth to fourth aspects. Six Oil flowing into the storage tank defined in any of the gist At least an oil / water separation channel having an oil / water inlet above the upper limit of the liquid level and having an oil / water outlet opened below the upper limit of the liquid level after descending toward the bottom of the storage tank. After being received in the heat exchange channel, the temperature is raised through the heat exchange channel. Storage tank In the oil-water separation method,
[0018]
When separating oil from oil water, generally, the higher the temperature, the easier. For example, when the drain generated by cooling the compressed air with a refrigerator is introduced into the separated water in the storage tank stored at room temperature, the drain having a low water temperature is quickly brought to the bottom of the storage tank due to the difference in specific gravity. Before reaching and separating the oil droplets, some of them may enter the electrolytic treatment tank by the discharge pipe. Therefore, when the temperature of the oil water introduced into the storage tank is lower than the temperature of the water stored in the storage tank, the oil droplet separation efficiency is improved by passing through the heat exchange channel. Storage tank When the atmosphere surrounding the tank is low, the storage tank may be positively heated.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the overall configuration of the first embodiment of the device of the present application. The oil-water separator of the present application receives the oil water generated from the oil-water generation source 100 and leaves the oil-water separation means D to separate the oil droplets by the difference in specific gravity, and the electrolytic separation treatment of the separated water from which the floating oil has been separated. Electrolytic separation means E that separates and floats the emulsion-like fine oil droplets, and adsorptive separation in which electrolytically treated water from which oil has been separated through electrolytic separation is introduced together with pressurized air and brought into contact with the adsorbent to remove the oil and purify it. And means F.
[0020]
As shown in FIG. 2, the floating oil separating means D has a storage tank 21 and an inlet 22 a that opens to the lower layer of the storage tank 21, penetrates the side wall of the storage tank 21, and is outside the storage tank. By opening, the penetrating position 21b has a separation water discharge pipe 22 that defines the upper limit of the liquid level of the storage tank 21, and an oil water inlet 25 above the upper limit of the liquid level, and the inside of the storage tank 21 toward its bottom 21a. An oil-water separation channel 23 having an oil-water outlet 24b opened below the liquid level upper limit and a separation oil channel 26 branched from the upper part of the descending region 24 of the oil-water separation channel 23 after being lowered, A floating oil discharge port 26 a is provided near the upper limit of the liquid level at the upper end of the separation oil passage 26.
[0021]
In the oil / water separation channel 23, oil is mainly separated from water in the descending region 24 of the channel 23, so that the capacity of the descending region 24 of the oil / water separation channel is determined by the supply of oil / water. It needs to have a volume that can stay for a sufficient time to separate the drops. Separation of a mixed system of oil droplets and water droplets having a relatively large diameter or oil water in an emulsion state into water and oil is generally easier as the temperature is higher. Therefore, when the temperature of the waste water containing the oil component supplied to the oil / water separation channel is higher than the temperature (room temperature) of the storage tank, the oil / water separation channel is preferably made of a material having heat insulation properties. On the other hand, if the temperature of the wastewater is lower than the temperature of the storage tank, it is desirable that the wastewater is made of a highly heat-conductive material. That is, when the oil / water separation channel 23 is configured by a heat transfer pipe made of aluminum or other metal, the oil / water separation channel 23 becomes a heat exchange channel.
[0022]
If the oil / water generation source 100 is a compressed air tank or an air dryer, the oil water discharged as drain containing compressor lubricating oil passes through the solenoid valve 101 and the drain trap 102, passes through the drain discharge pipe 103, and enters the oil / water inlet 25. be introduced. The oil water that has flowed into the oil / water separation channel 23 separates and floats oil droplets before reaching the lower part 24c of the channel 23, and the other moves upward from the lower part of the oil / water separation channel. From the floating oil layer 20 formed on the upper surface of the oil 21, the oil is discharged from an oil / water outlet 24 b that opens slightly downward. On the other hand, the floating oil separated and floated on the upper layer in the oil / water separation flow path is branched to the separation oil flow path 26 when the separation oil flow path 26 diverges and is discharged to the floating oil layer 20 from the separation oil discharge port 26a. The
[0023]
The floating oil separation means D according to the above embodiment does not disturb the inside of the storage tank by the flowing oil water, so that oil droplets that can be floated and separated are mixed in the discharge pipe 22 of the separated water beforehand. Can be prevented. The drain generated by cooling the compressed air with a refrigerator flows down to the oil water inlet at a temperature of about 10 ° C., and the ambient temperature surrounding the storage tank 21 is about 25 ° C. The temperature difference between the stored water temperature and the inflowing drain is around 15 ° C. Therefore, the oil water that has flowed into the heat exchange channel exchanges heat with the stored water already stored in the storage tank, and the temperature rises.
[0024]
As the drain temperature rises, the separation of water and oil droplets is promoted and the specific gravity decreases, so the tendency for the inflow drain to settle quickly in the separated water based on the specific gravity difference is suppressed at an accelerated rate. Is done. Thus, when the drained drain reaches the horizontal part 24c of the oil / water separation channel 23 as a heat exchange channel, most of the oil droplets that can be floated and separated are vertically descending areas extending from the oil / water inlet to the horizontal part 24c. Oil water containing fine oil droplets that are separated and released at 24 and cannot be easily separated is discharged from the oil water outlet 24b into the stored water.
[0025]
On the other hand, the oil droplets separated in the descending region 24 float up and collect in the pipe. However, when the oil layer reaches the vicinity of the branching portion of the separation oil channel 26, the oil droplets are separated from the separation oil channel 26. It moves inward and is gently discharged to the lower part of the floating oil layer through the flow path 26. Further, the drain pipe 22 discharges the separated water containing almost no oil at the bottom of the storage tank through the drain pipe 22 by the amount of drain flowing from the oil water inlet 25.
[0026]
In the floating oil separation means according to the above embodiment, since the drain from the compressed air dehumidifier has a condition that it is ten times lower than room temperature, the stored water temperature in the storage tank is higher than the oil water temperature flowing in. The means for holding was unnecessary, but when both temperatures are close to each other or when the room temperature is lower than the inflowing oil water, the oil-water separation flow path is made of a highly heat-insulating material, Although the influence of the stored separated water may be hindered, in order to increase the oil-water separation speed, the temperature of the stored separated water surrounding the heat exchange pipe may be further increased by using the warming means of the stored water.
[0027]
The floating oil separation means has high separation efficiency because the floating oil layer 20 in the storage tank 21 and the separated water below the disturbance oil are not disturbed by the drain that flows down from the oil / water inflow pipe 103. In addition, when the oil / water separation channel has a heat exchange function, the temperature of the inflowing drain is quickly raised, the specific gravity difference between the inflowing drain and the stored water is reduced, and the oil droplets can be easily separated. Can do. When there is no oil / water separation flow path or when it does not have a heat exchange effect, the specific gravity difference based on the difference between the temperature of the inflow drain and the temperature of the separation water held near room temperature before oil droplets separate and float Thus, there is no possibility that the cold drain quickly settles in the hot stored water and flows into the discharge pipe 22 as it is.
[0028]
The electrolytic separation means E includes an electrolytic tank 30 that receives the separated water (water in the lower layer of the storage tank) separated from the oil droplets by the floating oil separation means D from the discharge pipe 22, and an electrode 31 that is accommodated in the electrolytic tank 30. I have. The electrode 31 has a configuration in which aluminum anode plates and iron cathode plates are alternately arranged in a facing state at a predetermined interval. When the separated water introduced between the yin and yang electrode plates to which a direct current is applied from a power source (not shown) passes between the yin and yang electrode plates, the emulsified oil droplets and water have their interface potential. Due to the difference, the electrophoretic action causes separation. The separated fine oil droplets are agglomerated and agglomerated by aluminum hydroxide generated at the anode, and further, hydrogen bubbles generated at the cathode adhere to this, so that the fine oil droplets quickly float in the electrolytic water. Then, they gather on the surface of the water and are separated into a scum shape.
[0029]
In order to promote the electrolytic separation of oil and water, the electrolytic cell 30 may be provided with a stirring device, or provided with means for generating a water flow in a direction parallel to the electrode plate by pressurized air, a circulation pump, or the like. May be. However, it is important not to break the scum layer 32 that is separated and floated upward. The oil droplets that have floated and separated can be subjected to appropriate measures such as scum scooping, overflow due to water surface floating, selective absorption materials (such as pulp materials subjected to lipophilic treatment), suction removal using a suction pump or the like. 33 is an outflow pipe for trapping the scum layer and allowing only the electrolyzed water in the electrolysis tank 30 to flow out of the electrolysis tank in the same manner as the discharge pipe 22 in the floating oil separating means D.
[0030]
The outflow pipe 33 communicates with the bottom of the adsorption separation means F, and serves as a pressure feeding means for feeding electrolytically treated water into the adsorption tank 3 of the means F by the position head pressure due to the water level of the electrolytic tank 30.
The adsorption separation means F includes an adsorption tank 3, a pressurized air supply means 4 communicating with the lower part of the adsorption tank 3, and a plurality of partitions 7 and 7 disposed in the adsorption tank 4 with a predetermined space therebetween. ,..., And an adsorbent 8 housed in a space partitioned by the partition 7, and the partition 7 does not oppose the baffle A having an opening 6 a in the center and the opening 6 a of the baffle A. A plurality of openings 6b provided at positions (positions where both openings do not communicate with each other when overlapped) are formed in a cylindrical shape, and the pressurized air is supplied from the pressurized air supply means together with the electrolytically treated water. It is comprised so that it may supply to the lower part inside.
[0031]
G receives the adsorption treated water from the outflow pipe 12 of the adsorption separation means F into the lower part of the adsorption tank 49 and passes it through the adsorbent 48 stored in the adsorption tank 49 and having a high-accuracy adsorption capability. A purification adsorption tank for purifying the adsorption treated water, which can be omitted if necessary. Although the adsorption separation means F is comprised by the single tank, it is also possible to connect a some adsorption tank 3 in series, and to raise a capability and precision.
[0032]
The first embodiment of the adsorption separation means F will be described in detail below. In FIG. 3, the outflow pipe 33 of the electrolyzed water communicates with the lower part of the cylindrical adsorption tank 3. The lower part of the adsorption tank 3 communicates with the pressurized air supply means 4 via the electromagnetic valve 5 and the upper part of the adsorption tank 3 is open. In the adsorption tank 3, as shown in FIG. 4, a baffle A (surface) having an opening 6a at the center and a baffle B having a plurality of openings 6b formed at positions not facing the opening 6a are opposed to each other. The partition bodies 7 configured to have a substantially cylindrical shape are arranged in multiple stages so as to have a space as an adsorption processing chamber between the partition bodies 7 and 7 at a predetermined interval.
[0033]
In the space (adsorption treatment chamber), an adsorbent 8 is formed by filling a mesh net bag or a cylindrical bag with polypropylene chips or ribbons having high oil adsorbing performance and having high hydrophobicity and lipophilicity. Is stored. Specific examples of the adsorbent include Orthosorb (registered trademark of Teijin Limited). The openings 6a and b of the baffle A and the baffle B are set so that the cross-sectional area of the opening 6a is smaller than the total cross-sectional area of the opening 6b. A gap closing member 9 made of an elastic material such as sponge is joined to the side surface of the partition 7.
[0034]
As a second embodiment of the adsorption separation means F, a cylindrical adsorption tank 3 having an open part in the upper part, a pressurized air supply means 4 communicating with the lower part of the adsorption tank 3, and a predetermined amount in the adsorption tank 4 What has a plurality of partitioning bodies 7 arranged across a space and an adsorbent 8 housed in a space as an adsorption processing chamber partitioned by the partitioning body 7 and is in the upper layer portion of the partitioning bodies Is formed in a cylindrical shape with a baffle A having an opening 6a in the center and a plurality of openings 6b provided at positions not facing the opening 6a of the baffle A, and located in the lower layer portion of the partition Is composed of a cylindrical partition having a plurality of openings near the center of the front and back surfaces, and a cylindrical partition having numerous holes drilled over the entire front and back surfaces, together with the electrolytically treated water, pressurized air Configured to supply pressurized air from the supply means to the lower part of the adsorption tank The can be presented.
[0035]
5-7 show an example of the second embodiment of the adsorption separation means. In FIG. 5, in the upper layer, the same partition body 7 as the partition body in the first embodiment is disposed, in the lower layer, a plurality of through holes 10a are drilled in the front and back surfaces in the lowermost layer, and elastic such as sponge is formed in the side surface. The partition body 10 joined with the gap closing material 9 made of a body and the partition body 11 with innumerable through holes 11a on the front and back surfaces and joined with the gap closing material 9 on the side surface are provided with a slight gap 16. As in the case of the first embodiment, the space between the partitions 7 and 11 is arranged so as to be superposed, and has excellent oil adsorption performance, and is made of polypropylene that is hydrophobic and highly oleophilic. The adsorbent 8 is filled with a synthetic resin chip or ribbon filled in a net bag or a cylindrical bag. In addition, 12 is an outflow pipe connected to the upper part of the adsorption tank, and it is comprised so that the adsorption separation process water which always overflows may flow out from upper opening.
[0036]
Electrolytically treated water flows into the adsorption tank 3 from the electrolytic tank 30 and pressurized air is supplied from the pressurized air supply means 4 by opening the electromagnetic valve 5. When attention is paid to the adsorption treatment chamber at the lowermost part of the adsorption tank 3, electrolytically treated water and pressurized air that have flowed from below the adsorption tank 3 are blown out toward the adsorbent 8 from the openings of the partitions 7 and 11 ( FIG. 8-a). Since pressurized air is always supplied regardless of the amount of the electrolytic treatment water, the electrolytic treatment water soaking the adsorbent 8 is always in a state of being stirred and vibrated, and the adsorbent 8 The oil is adsorbed while contacting. Since the adsorbent 8 is immersed in the electrolytically treated water, the pressurized air is difficult to pass linearly between the adsorbents, and the adsorbent 8 holds the foam-like pressurized air. The adsorbent 8 is pushed up together with the electrolytically treated water (FIG. 8B).
[0037]
Next, the air passes through the raised adsorbent and the electrolytically treated water all at once, and the adsorbent and the electrolytically treated water fall toward the lower partition (FIG. 8C). And it is pushed up by pressurized air again. Then, a part of the electrolytically treated water and the pressurized air escape from the opening 6a of the partition 7 provided in the upper layer, and the adsorption processing chamber (the central adsorption process in FIG. 8) is formed by the space between the upper partitions 7 and 7. The adsorbent 8 guided to the chamber and accommodated in the space adsorbs oil while contacting the agitated electrolytically treated water. Eventually, the upper-layer adsorbent 8 is also in a state of holding a large number of bubbles of pressurized air, and the above-described phenomenon is repeated to lift the adsorbent 8 (the central adsorption processing chamber in FIG. 8C). It is led to the upper adsorbent 8 (the uppermost adsorption processing chamber in FIG. 8) through the opening 6a of the body 7. Such a phenomenon is repeated.
[0038]
The pressurized air bubbles that pushed up the adsorbent 8 pass between the adsorbent pieces 8a,..., And as a result, part of the adsorbent 8 and the electrolytically treated water loses lift and falls toward the partition 7 below. Will do. On the other hand, one part of the pressurized air and part of the electrolytically treated water that have passed through the uppermost adsorbent and the electrolytically treated water is released into the atmosphere, and the other is adsorbed treated water that is discharged from the outflow pipe 12. Is done. The volume ratio between the electrolytically treated water and the air occupying the adsorption tank is kept constant by the air flow rate, and overflows from the outflow pipe 12 at the upper part of the adsorption tank by the amount of the electrolytically treated water flowing in. In the second embodiment, since there is only one adsorption treatment chamber, the adsorbent 8 comes into a state containing bubbles of pressurized air to some extent after contacting the electrolytic treatment water stirred by the pressurized air. Overflow from the opening provided in the upper part. In addition, since the gap closing material 9 such as a sponge is attached to the side surfaces of the partitions 7, 10, 11 when the pressurized air is supplied, the compressed air escapes from the gaps at the side portions of the partition body. Therefore, the adsorbent 8 is pushed up, and the supplied pressurized air is finally discharged from the upper opening of the adsorption tank 3 to the outside of the tank.
[0039]
In the first embodiment shown in FIG. 3, the adsorbent 8 in the lower layer is pushed up by containing pressurized air, and is repeatedly moved up and down for falling by the escape of the pressurized air held between the adsorbent pieces 8a. (For example, 3 to 4 times / second), the lower-layer electrolytically treated water is pushed up to the upper layer through the opening 6 a of the partition 7 together with the pressurized air.
Thus, a part of the electrolytically treated water moves to the upper adsorbent 8. In this process, the electrolytically treated water is subjected to the stirring action by the pressurized air in the adsorption treatment chamber, contacts with the adsorbent many times, and the oil that could not be electrolytically separated is adsorbed while adsorbed on the adsorbent 8. Due to the pushing-up action of the material 8, the material 8 moves again to the upper layer through the opening 6 a of the upper partition 7. As a result, the electrolytically treated water gradually moves to the upper adsorption treatment chamber while removing oil. Therefore, the upper layer adsorbent is less contaminated with oil than the lower layer adsorbent. In other words, the higher the layer is, the higher the sewage cleaning ability by adsorbing the oil content of the adsorbent 8 is maintained. Cleanliness is high.
[0040]
In the first and second embodiments, macroscopically, the pressurized air stirs the electrolytically treated water to generate bubbles, and the adsorbent moves up and down by the bubbles (in other words, water in the cylindrical container). Water and air movement as if the container was shaken up and down with air and air), but the air current blown into the electrolytically treated water in the adsorption treatment chamber generated vortex and collision flow. The adsorbent pieces themselves in the adsorption treatment chamber may be agitated to increase the contact efficiency between the electrolytically treated water and the adsorbent. The water treated by the adsorption separation means F passes through an adsorption tank 43 that is further filled with an adsorbent 48 such as activated carbon, if necessary. As a result, the cleanliness can be further improved, and the treated water can be not only discarded but also directly reused for other purposes.
[0041]
According to the apparatus of the present application and the method of separating oil from oil and water using the apparatus, oil droplets having a large diameter are first separated by the floating oil separating means, and then the fine emulsion-like oil droplets are separated into fine oil droplets between the electrodes. At the same time, the fine oil droplets are flocked and floated and separated by the by-product aluminum hydroxide and hydrogen bubbles, so that most of the oil in the electrolytically treated water entering the adsorption separation means is removed. It becomes. Therefore, the oil load of the adsorbent is extremely small as compared with the conventional case. Therefore, the use period of the adsorbent is significantly increased. In particular, the effect is significant in the case of a porous type adsorbent such as activated carbon.
[0042]
Furthermore, when the adsorption separation means is of a type that introduces electrolytically treated water and pressurized air into the adsorption treatment chamber defined by the partition, the oil separation efficiency is further improved. In particular, when the rear surface of the partition has a structure having a plurality of openings excluding the central portion and the front surface has an opening in the center, the electrolytically treated water and the pressurized air are supplied in a form that blows out from the bottom center of the adsorbent. Will be. Due to the blowing action of the pressurized air, the electrolytically treated water is stirred and brought into contact with the adsorbent, and the oil is adsorbed and removed with extremely high efficiency.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of the present oil / water separator.
2 is an explanatory view showing details of floating oil separating means of the apparatus shown in FIG. 1. FIG.
FIG. 3 is an explanatory cross-sectional view showing details of the adsorption separation means of the apparatus shown in FIG. 1;
4 is a perspective view showing the structure of the front and back of the partition body of FIG. 3. FIG.
5 is an explanatory view showing details of another embodiment of the adsorption separation means of the apparatus shown in FIG. 1. FIG.
6 is a perspective view showing a structure of a partition body arranged in a lower layer of the adsorption separation means of FIG. 5. FIG.
7 is a perspective view showing a structure of a partition body arranged in the lowermost layer of the adsorption separation means of FIG.
8 is an explanatory diagram showing a change with time from state a to state c in the adsorption tank shown in FIG. 3;
[Explanation of symbols]
D Floating oil separation means
20 Floating oil layer
21 Reservoir
23 Oil-water separation channel
26 Separation oil passage
100 Oil and water source
103 Drain discharge pipe
E Electrolytic separation means
30 Electrolyzer
31 electrodes
32 Scum
33 Outflow pipe
F Adsorption separation means
3 Adsorption tank
4 Pressurized air supply means
7, 10, 11 Partition
8 Adsorbent
G Purification adsorption tank

Claims (7)

Floating oil separation means comprising a storage tank provided with an oil water inlet and separation water discharge pipe, and electrolytic separation means comprising an aluminum electrode housed in an electrolytic tank connected to the storage tank via the discharge pipe And an adsorption separation means having an adsorption treatment chamber having an inlet and an outlet for electrolytic treatment water treated by the electrolytic separation means and containing an adsorbent therein. . Floating oil separation means comprising a storage tank provided with an oil water inlet and separation water discharge pipe, and electrolytic separation means comprising an aluminum electrode housed in an electrolytic tank connected to the storage tank via the discharge pipe And an adsorbing / separating means in which one or more adsorption processing chambers each having a gas-liquid entrance and exit and containing an adsorbent therein are connected in a vertical direction so as to form a series of gas-liquid flow paths. The adsorption treatment chamber located at the bottom of the adsorption treatment chamber is provided with an adsorption separation means formed by connecting a pressurized air supply means and a pressure feed means for electrolytic treatment water from the electrolytic cell. An oil-water separator characterized by that. A plurality of adsorption processing chambers are provided in an upright cylindrical container with a pressurized air supply means and an electrolyzed water pumping means connected to the lower part, and a partition that defines a plurality of spaces in the vertical direction, and each of the spaces The said partition is comprised by the baffle A which has an opening in the center part, and the baffle B which has several opening in the position which does not oppose the opening of this baffle A. Oil-water separator. Oil water is received in a storage tank and allowed to stand, and oil droplets are floated and separated due to the difference in specific gravity, and then water in the lower layer of the storage tank is introduced into an electrolytic separation tank equipped with an aluminum electrode, followed by electrolytic treatment, and separated oil. An oil-water separation method characterized in that droplets are agglomerated and separated by aluminum hydroxide produced in electrolytic treatment water, separated and removed, and then the obtained electrolytic treatment water is passed through an adsorption tank containing an adsorbent. . Oil water is received in a storage tank and allowed to stand, and oil droplets are floated and separated due to the difference in specific gravity, and then water in the lower layer of the storage tank is introduced into an electrolytic separation tank equipped with an aluminum electrode, followed by electrolytic treatment, and separated oil. The droplets are agglomerated and separated by aluminum hydroxide produced in the electrolyzed water, separated and removed, and then the obtained electrolyzed water is stored in an adsorption treatment chamber equipped with a gas-liquid circulation port. Oil-water separation, wherein the water is introduced into the adsorption tank and pressurized air is introduced into the electrolytically treated water in the adsorption tank so that the electrolytically treated water passes through the adsorption tank while being stirred with the adsorbent. Method. The adsorption tank is partitioned by one or more partitions having gas / liquid entrances and exits, so that it has a plurality of adsorption treatment chambers that overlap in the vertical direction and are connected in series through the entrances and exits, and the electrolytic treatment introduced into the adsorption tank The oil-water separation method according to claim 5, wherein water and pressurized air are configured to move sequentially from the lowermost adsorption treatment chamber to the upper adsorption treatment chamber. Oil water flowing into the storage tank has an oil water inlet above the upper limit of the liquid level and descends toward the bottom in the storage tank, and then the oil water outlet opens below the upper limit of the liquid level and has an heat exchange effect. after received in the heat exchange passage at least includes the separated channel, characterized in that it is released into the reservoir by raising the temperature through the heat exchange passage, any one of claims 4 6 The oil-water separation method as described .

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