JPH1190114A - Device for purifying oil-containing waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more surely and simply purify oil-containing water. SOLUTION: This device is provided with a filtration means 2 having a 1st tank 9 and a filter media 11 packed in the 1st tank 9 and structured so that the oil-containing waste water W0 is passed through the filter media 11 toward the upper side, an oil adsorption means 3 positioned at the upper side of the filter media 11 in the 1st tank 9 and for adsorbing the oil portion contained in the water W1 passed through the filter media 11, a water treating means 4 having a 2nd tank 38 storing the water W2 discharged from the oil adsorption means 3 and for treating the water W2 in the 2nd tank 38a with microorganism by aeration, and a sterilization means 5 having a 3rd tank 43 storing the water W3 discharged from the water treating means 4 and for sterilizing the water W3 in the 3rd tank 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car washing machine for a gas station and a device for purifying oil-containing wastewater discharged from various factories.

[0002]

2. Description of the Related Art Conventionally, for example, in an apparatus for purifying oil-containing wastewater in a car washing machine, a chemical such as a flocculant or a neutralizing agent is added to the wastewater in order to purify the wastewater by removing oil and suspended substances in the wastewater. It has been practiced to mix and settle the oil and suspended solids, and then remove them by filtering or the like.

[0003]

However, in the case of purifying wastewater using the above-mentioned chemicals, there is a problem that the control of the amount of the chemicals and the operation of maintenance and management become extremely complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an apparatus for purifying oil-containing wastewater, which can more reliably purify the oil-containing wastewater and can perform the purification by a simple operation. As an issue.

[0005]

An apparatus for purifying oil-containing wastewater according to the present invention for solving the above-mentioned problems is as follows.

[0006] of Claim 1 invention, the first tank 9, and a filtering material 11 to be filled within this first tank 9, oil-containing waste water W ₀ is passed toward the filtration media 11 upward as to the filtration unit 2; oil suction means 3 is located on the upper side to adsorb the oil contained in the water W ₁ which has passed through the filtering material 11 of the filtering material 11 at the inside the first tank 9; this A water treatment means 4 having a second tank 38 for storing water W ₂ drained from the oil adsorbing means 3, and aerating the water W ₂ in the second tank 38 to treat the water W ₂ with microorganisms; those having a; a third tank 43 for storing water W ₃ that is drained from the water W ₃ in this third tank 43 and sterilizing means 5 for sterilization.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the filter medium 11 is disposed in an upper portion of the first tank 9 so as to be located halfway between the upper portion and the lower portion of the first tank 9. it is obtained so as to introduce the oil-containing wastewater W ₀ in part.

[0008] The invention of claim 3 is the invention of claim 1 or 2
In addition to the above invention, the oil adsorbing means 3 has an axis 26 extending substantially horizontally, and has an upper end surface and an axis 2 extending vertically.
A pipe member 27 that the water surface 29 of the inner first tank 9 is submerged in the oil-containing wastewater W ₀ to be located between the 6, porous material 31 with a water-permeable to Hamada' is freely fitted in the pipe member 27 has the door, forming a plurality of communication holes 36 for communicating the inside and outside to the middle portion in the axial direction of the pipe member 27, as above the filtering material 11 water W ₁ is each communicating hole 36 that has passed through the While flowing into the inside of the pipe material 27, it flows toward the end of the pipe material 27 and flows from the end to the second
The water is drained toward the tank 38 side.

According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, as viewed from the flow direction of the water W ₁ inside the pipe member 27, each of the communication holes 36 extends from the upstream side to the downstream side. Is gradually changed from the bottom to the top of the pipe member 27. It is.

The invention of claim 5 is the one in which the copper material 44 is installed in the water W ₂ in the third tank 43 in addition to any one of the inventions of claims 1 to 4.

According to a sixth aspect of the present invention, in addition to any one of the first to fifth aspects of the present invention, a plurality of the first tanks 9 are provided, and these are arranged in a row in front and rear. among them, to introduce the oil-containing wastewater W ₀ in the first tank 9 (a) of the rearmost, the from the first tank 9 of the last portion (a) in series shape toward the first tank 9 (C) of the foremost Oil-containing wastewater W ₀
The second tank 38 and the third tank 43 are arranged side by side in the front and rear, and the first tank 9 group is stacked above the second and third tanks 38 and 43. It is.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

[0013] In FIG. 1, reference numeral 1 is a purifying apparatus for purifying oil-containing wastewater W ₀ to be drained from car wash provided in the gas station. The oil-containing wastewater W ₀ is
Once stored in the storage tank, pebbles and sand have been almost removed. In addition, for convenience of explanation, the following description will be made with the direction of the arrow Fr in the figure as the front.

[0014] The purification device 1, by filtering the oil-containing wastewater W _0, the filtering means 2 for capturing the suspended solid substance such as dust or fibers of the oil-containing wastewater W ₀ (so-called SS),
An oil adsorbing means 3 for adsorbing oil contained in the water W ₁ discharged from the filtering means 2, a water treating means 4 for biologically treating the water W ₂ discharged from the oil adsorbing means 3, and sterilizing means 5 for sterilizing water W ₃ that is drained from the water treatment means 4, and a casing 6 covering the respective unit 2-5 overall, the opening of the openable and closable in place in the casing 6 is formed The maintenance and inspection work can be arbitrarily performed on the above means through these openings.

1, 2 and 3, the filtering means 2
Has a first tank 9 made of FRP that opens upward,
Lid 1 that closes the upper end opening of this first tank 9 so that it can be opened and closed
0, and the first tank 9 is supported by a frame (not shown). An upper portion in the first tank 9 is filled with a filtering material 11, and an inlet 12 for allowing the oil-containing wastewater W ₀ to be introduced is provided in a middle portion between an upper portion and a lower portion of the first tank 9. It should be noted that the oil-containing wastewater W ₀ to below, the water W
Also expressed as a superordinate concept of ₁ .

The filtering material 11 has a water-permeable and porous fibrous material layer 14 stacked in the vertical direction, an infinite number of ceramic granule layers 15 and a wire mesh 16. Thus, it is detachably supported by the first tank 9. Further, the filter medium 11 is provided in the first tank 9.
, So that maintenance and inspection work on the filter medium 11 can be performed.

A drain port 18 is formed on the upper side wall of the first tank 9 above the upper surface of the filter medium 11, and an overflow drain port 19 is formed slightly above the drain port 18. .

A plurality (three) of the first tanks 9 are provided, and these first tanks 9 are arranged in front and rear. Of the first tank 9 group, the last first tank 9 (A)
Of the above inlet 12, the oil-containing wastewater W ₀ through a pipe 21 from the water pump 20 are supplied. Further, a drain port 18 of the rearmost first tank 9 (A) is communicated with the inlet port 12 of the first tank 9 (B) in the middle part in the front-rear direction by a pipe 22, and a first tank in the middle part. 9
The drain port 18 of (B) is connected to the inlet port 12 of the foremost first tank 9 (C) by a pipe 23. In other words, the first tank 9 (A) at the rearmost portion and the first
Oil-containing wastewater W ₀ is adapted to be in flowing first tank 9 group towards the tank 9 (C) in series form.

In all figures, the oil adsorbing means 3 is located above the filter medium 11 in the first tank 9 and adsorbs oil contained in the oil-containing wastewater W ₀ passing through the filter medium 11. Things.

The oil adsorbing means 3 is made of a resin pipe member 27 having a circular center and an axial center 26 extending substantially horizontally back and forth.
And a left and right pair. Each of the pipe members 27 has its front end (one end) gathered, and the gathered portion is removably fitted into the drain port 18.
The tank 9 is detachably supported. Further, the pipe members 27 are placed on the upper surface of the filter member 11, whereby the pipe members 27 are also supported by the first tank 9. On the other hand, a cap 28 is provided at the rear end (the other end) of each pipe member 27 so as to open and close its opening.

The water surface 29 in the first tank 9 is determined by the height of the drain port 18 and the subsequent water pressure. However, during normal operation of the purification device 1, the upper end surface of the pipe member 27 in the vertical direction said water surface 29 of the inner first tank 9 between the axis 26 is so positioned, the pipe member 27 is submerged in oil-containing wastewater W ₀ and. When the water surface 29 reaches the vicinity of the upper surface of the pipe member 27, the water surface 29 does not rise any more.
Through the overflow drain 19, the oil-containing wastewater W
₀ is drained out of the first tank 9.

A water-permeable brush-shaped porous material 31 is provided from the rear end of the pipe member 27 so as to be removably fitted into the pipe member 27. This porous material 31
A plurality of wire shafts 32 substantially located on the shaft center 26
And a cylindrical porous material main body 33 supported on the shaft 32 substantially coaxially with the shaft 32. The outer diameter of the porous material main body 33 and the inner diameter of the pipe material 27 are substantially the same. It has the same dimensions. The porous material main body 33 is composed of a large number of resin wires 34 projecting radially from the shaft 32, and a water passage is formed between the wires 34. Each of the wires 34 has elasticity and projects substantially linearly outward from the shaft 32 in the radial direction.

A plurality of circular communication holes 36 are formed in the middle of the pipe member 27 in the axial direction (the front-rear direction) to communicate the inside and the outside thereof.

In each of the first tanks 9, the water W ₁ that has passed through the filter medium 11 flows into the pipe members 27 through the communication holes 36, and the front end of the pipe members 27. And flows from the first tank 9 through the drain port 18 from the front end. When the inside of the pipe member 27 water W ₁ flows, the water W _1, the porous material in the pipe member 27 31
It is supposed to pass through the inside.

[0025] In FIG. 1, the water treatment means 4, a second tank 38 for storing water W ₂ which is drained from the first tank 9 of the foremost (C), the water W ₂ in this second tank 38 And an aeration device 39 for aerating the upstream portion. The aeration device 39 and the aeration pump 40, and a porous member 41 disposed in the water W ₂ of the inner second tank 38. The compressed air from the aeration pump 40 is supplied to the porous material 41 in the water W _2, countless bubbles are adapted to be jetted successively with the water W ₂ through the porous material 41.

The water treatment means 4 has a filtering material 42 provided downstream of the water W ₂ in the second tank 38. The filter medium 42 is formed by arbitrarily combining the fibrous material layer 14, the granular material layer 15, and the wire mesh 16 of the filter medium 11.

[0027] In FIG. 1, the sterilization unit 5, a third tank 43 for storing water W ₃ which is drained by an overflow from the second tank 38 of the water treatment means 4, the water W ₃ in this third tank 43 Copper pipe 44 installed inside
When, and a drug supply unit 45 to allow supply sterilant is chlorine in the water W _3. Note that the medicine supply means 45 may not be provided. Further, as the copper material 44, a silver material that generates silver ions may be used together with or instead of the copper material 44. That is, a metal which easily generates metal ions may be used.

In the above case, the second tank 38 and the third tank 43 are arranged side by side in front and rear.
The first tank 9 group is stacked above the third tank 43. A drain pump 46 for draining the purified water W ₄ in the third tank 43 to the outside of the purification device 1 and a pipe 47 for returning the purified water W ₄ from the drain pump 46 to the car wash position are provided.

A drain valve 4 is provided at each bottom of each of the first tank 9, the second tank 38, and the third tank 43.
A drain pipe 49 is connected through the drain pipe 8.

According to the above configuration, the oil-containing wastewater W ₀ (for example, 30 l / min continuously for one day) supplied to the rearmost first tank 9 (A) of the first tank 9 group, It sequentially passes through the filter medium 11 and the oil adsorbing means 3 provided inside the first tank 9 (A), the first tank 9 (B) in the middle, and the first tank 9 (C) in the forefront. The water W ₂ is supplied to the second tank 3 of the water treatment means 4.
8 will be drained.

[0031] In the above case, oil-containing waste water W ₀ is, when passing through the filtering material 11 in each of the filtering means 2, suspended substances contained in the oil-containing wastewater W ₀ is filtered trapped. Further, when the oil-containing wastewater W ₀ as described above passes toward the filtration media 11 upward, oil contained in the oil-containing wastewater W ₀ is coarsened, the coarsened oil is increased flying velocity is allowed while with oil-containing wastewater W ₀ passing through the filtering material 11 reaches its upper side.

Next, the coarse oil contained in the water W ₁ filtered by the filter medium 11 is further removed by the oil adsorbing means 3 above the filter medium 11 because of the coarse particles. The water W ₂ discharged from the oil adsorbing means 3 is efficiently adsorbed, so that the oil content of the water W ₂ is sufficiently reduced.

Next, the water W ₂ drained from the oil adsorbing means 3 is stored in a second tank 38 in the water treatment means 4. Then, the water W ₂ in the second tank 38 is aerated by the aeration device 39. Therefore, this water W ₂
The organic matter such as oil traces contained in processed by microorganisms has, together with the smell of the water W ₂ is extinguished, and thus to be purified in the cleaner.

In the above case, since the filter medium 42 is provided in the second tank 38, the growth of microorganisms is promoted by the filter medium 42, and the purification by the water treatment is more effectively performed.

Next, the water W ₃ drained from the water treatment means 4 by overflow is stored in the third tank 43 of the sterilization means 5. Since the water W ₃ in the third tank 43 is sterilized by the copper ions naturally generated by the copper material 44, it is possible to prevent the inconvenience of germs from propagating in the water W ₃ and to purify the water in a stable manner. Water W ₄ is obtained, and the purified water W ₄ can be reused for car washing.

As described above, the first tank 9
The filter medium 11 is disposed in the upper part of the inside, and the oil-containing wastewater W ₀ is introduced into the middle part between the upper part and the lower part of the first tank 9. W
_{If 0} contains heavy solids 50 such as sand,
When the oil-containing wastewater W ₀ is introduced into the first tank 9, the solid content 50 sediments by its weight at the lower part of the first tank 9 and is separated from the oil-containing wastewater W ₀ . The settled solids 50 can be discharged through a drain pipe 49 by opening the drain valve 48.

In the oil adsorbing means 3, the water W _{1, which} is filtered by the filtering means 2 and contains more oil near the water surface 29, passes through the communication holes 36 and flows into the pipe member 27. Is allowed to flow. And this water W ₁
While passing through the porous material 31 within the pipe member 27 to flow toward the front end of the pipe member 27, this time, oil contained in the water W ₁ is effectively trapped by the porous material 31 And is adsorbed. In this case, since the porous material 31 is removably fitted to the pipe material 27, when a large amount of oil is adsorbed on the porous material 31, as shown by a dashed line in FIG. What is necessary is just to take out from the pipe member 27 and remove the adsorbed oil.

Therefore, the removal of the oil component is ensured, and
Because it can easily, correspondingly, with the purification of the oil-containing wastewater W ₀ is more reliable, the work order to the purification so that the can easily.

As viewed from the flow direction of the water W ₁ inside the pipe member 27, the arrangement of the communication holes 36 is determined by the arrangement of the communication holes 36 from the upstream side to the downstream side (toward the front side). It is supposed to make a gradual transition from the bottom to the top.

[0040] Therefore, the respective communication holes 36, from being distributed in the vertical direction toward the top from the bottom of the pipe member 27, also the water surface 29 of the water W ₁ is fluctuated up and down,
The water W ₁ flows into the pipe member 27 through one of the communication holes 36, and the oil is removed by the porous member 31.

Since the communication holes 36 are dispersed in the axial direction of the pipe member 27, only a part of the pipe member 27 in the circumferential direction is formed at each axial portion. The water W ₁ flows into the pipe member 27 through the communication hole 36.

Therefore, in each part of the pipe member 27 in the axial direction, water W ₁ is supplied from each part in the circumferential direction to the pipe member 2.
The water W ₁ in the pipe member 27 flows into and interferes with each other.
Is prevented from being disturbed,
Since the turbulence of the water W ₁ in the pipe material 27 is suppressed and the water W ₁ is allowed to pass through, the oil content in the water W ₁ is reduced by the porous material 31.
Will be effectively adsorbed.

Here, assuming that the arrangement of the communication holes 36 is gradually changed from the upper portion to the bottom portion of the pipe member 27 toward the front, the arrangement of the communication holes 36 on the upstream side of the pipe member 27 below the communication holes 36 is assumed. Inside the pipe material 27,
Since water W ₁ hardly flow occurs, this portion becomes a dead space, so that the adsorption of oil by the porous material 31 is inhibited.

Therefore, as described above, as viewed from the flow direction of the water W ₁ inside the pipe member 27, the arrangement of the communication holes 36 increases from the bottom to the upper part of the pipe member 27 from the upstream side to the downstream side. Therefore, the water W ₁ flowing into the pipe material 27 through the communication hole 36 formed at the bottom of the pipe material 27 on the upstream side of the pipe material 27 flows upstream of the pipe material 27. will be elevated towards the water surface 29 inside the porous material 31 of the inner, i.e., by part of the porous material 31 on the upstream side of the pipe member 27, the oil of sufficient water W ₁ is adsorbed and Become.

Therefore, according to the oil adsorbing means 3, the water W
The removal of oil from inside ₁ will be performed more effectively.

In the first tank 9, suspended solids are trapped by the filtration by the filter material 11, and
Oil is adsorbed by the oil adsorbing means 3. If the amount of oil trapped or adsorbed by these oils increases, it is necessary to take them out of the first tank 9 as maintenance work and remove them.

In this case, as described above, the first
The tank 9 plurality, for the oil-containing wastewater W ₀ in these first tank 9 group were so as to flow in series fashion, compared with the first tank 9 to each other, first, last oil-containing wastewater W ₀ is introduced It is considered that the trapped amount and the adsorbed amount in the first tank 9 (A) of the portion become maximum. Therefore, if maintenance work is performed on the last first tank 9 (A) for a predetermined period, the purifying device 1 can be operated normally without frequently performing maintenance work on all the first tanks 9. Can be.

[0048] According to the above configuration, the first tank 9 of the last portion for introducing the oil-containing wastewater W ₀ (A), both longitudinal and the third tank 43 for draining the purified water W ₄ after purification It will be located on the same side on the rear side.

Therefore, the pipe 21 for supplying the oil-containing wastewater W _{0 to} the purification device 1 and the pipe 47 for taking out the purified water W ₄ from the purification device 1 are concentrated on one side before and after the purification device 1. Oil-containing wastewater W ₀
Management and of purified water W ₄ is more likely.

Further, when a plurality of first tanks 9 are provided, they are arranged in front and rear, while the first tank 9 group is stacked on second and third tanks 38 and 43 arranged in front and rear. Therefore, the area of the purification device 1 in plan view is reduced.

Further, since the plurality of first tanks 9 are arranged in front and rear as described above, the height of the first tank 9 group can be kept lower than in the case where only the first tank 9 is provided alone. . That is, even if the first tank 9 group and the second and third tanks 38 and 43 are stacked, it is possible to prevent the total height thereof from becoming too high.

Therefore, the purifying device 1 can be viewed in a plan view and a side view.
It becomes compact.

Although the above is based on the illustrated example, the first tank 9 may be a single tank. Further, the lid 10 may not be provided.

[0054]

The effects of the present invention are as follows.

According to a first aspect of the present invention, there is provided a filtering means having a first tank and a filtering material filled in the first tank, and an oil-containing drainage passing upward through the filtering material. Oil adsorbing means for adsorbing oil contained in water passing through the filter medium and located above the filter medium in the first tank; and a second tank for storing water discharged from the oil adsorbent means A water treatment means for aerating the water in the second tank and treating it with microorganisms; and a third tank for storing water discharged from the water treatment means. Sterilization means for performing a sterilization treatment.

Therefore, when the oil-containing wastewater passes through the filtering material in the filtering means, suspended substances contained in the oil-containing wastewater are captured and filtered. Also, as described above, when the oil-containing wastewater passes upward through the filter medium, the oil contained in the oil-containing wastewater is coarsened, and the coarsely-grained oil is mixed with the oil-containing wastewater while increasing the floating speed. It passes through the filter and reaches the upper side.

Next, the coarse oil contained in the water filtered by the filter medium is more efficiently adsorbed by the oil adsorbing means on the upper side of the filter medium because of the coarse particles. For this reason, the water drained from the oil adsorption means has a sufficiently low oil content.

Next, the water drained from the oil adsorbing means is aerated in the second tank in the water treatment means, so that a small amount of organic matter such as oil contained in the water is treated by microorganisms. As a result, the smell of the water is extinguished, and the water is further purified.

Next, since the water drained from the water treatment means is sterilized in the third tank in the sterilization means, it is possible to prevent the inconvenience of germs from propagating in the water, and to stabilize the water quality. Purified water can be obtained, and this purified water is useful for reuse in car washing.

Therefore, the oil-containing wastewater is reliably purified, and the purification does not require complicated operations such as adjustment of the amount of chemicals. Becomes

According to a second aspect of the present invention, the filter material is disposed in an upper portion of the first tank, and the oil-containing wastewater is introduced into a middle portion between an upper portion and a lower portion of the first tank. .

Therefore, if the oil-containing wastewater introduced into the first tank contains heavy solids such as sand,
When the oil-containing wastewater is introduced into the first tank, the solid content sinks by its weight to the lower part of the first tank and is separated from the oil-containing wastewater.

Accordingly, the purification of the wastewater becomes more effective.

According to a third aspect of the present invention, the oil adsorbing means has an axis extending substantially horizontally, and the water surface in the first tank is located between the upper end surface and the axis in the vertical direction. A pipe member submerged in the oil-containing drainage and a water-permeable porous member removably fitted into the pipe member, and a plurality of pipe members communicating the inside and outside of the pipe member with a middle portion in the axial direction of the pipe member. A communication hole is formed, and water that has passed through the filter medium flows into the pipe material through the communication holes, flows toward an end of the pipe material, and flows from the end to the second tank. It is drained to the side.

For this reason, the water that is filtered by the filtering means and contains more oil near the water surface is caused to flow into the pipe material through the communication holes. And
The water flows toward the end of the pipe material while passing through the porous material in the pipe material. At this time, the oil contained in the water is effectively captured and adsorbed by the porous material. The Rukoto. In this case, since the porous material is detachable from the pipe material, when a large amount of oil is adsorbed on the porous material, the porous material is taken out of the pipe material to remove the adsorbed oil. I just need.

Accordingly, the removal of the oil component is ensured, and
Since it can be easily performed, the purification of the oil-containing wastewater is more reliably performed, and the work for purifying the oil-containing wastewater can be simplified.

According to a fourth aspect of the present invention, the arrangement of the communication holes gradually transitions from the bottom to the top of the pipe material from the upstream side to the downstream side in the flow direction of water in the pipe member. I have to do it.

For this reason, since the respective communication holes are vertically arranged from the bottom to the upper part of the pipe member, even if the water level of the water fluctuates up and down, the water is supplied to one of the communication holes. And flows into the pipe material, and the oil is removed by the porous material.

Further, since the communication holes are distributed in the axial direction of the pipe material, the communication holes formed only in a part of the circumferential direction of the pipe material are formed in the respective axial portions of the pipe material. As a result, water flows into the pipe material.

Therefore, in each axial portion of the pipe material, water flows from each circumferential portion into the pipe material and interferes with each other so that the flow of water in the pipe material is disturbed. Thus, the turbulence of the water in the pipe material is suppressed and the water is allowed to pass through, so that the oil component in the water is effectively adsorbed by the porous material.

Here, suppose that the arrangement of the communication holes is gradually changed from the top to the bottom of the pipe material toward the upstream side, and the inside of the pipe material below the communication hole on the upstream side of the pipe material is assumed. In this case, since water does not easily flow, this portion becomes a dead space, and the adsorption of oil by the porous material is hindered.

Therefore, as described above, the arrangement of the communication holes gradually changes from the bottom to the top of the pipe member from the upstream side to the downstream side in the flow direction of the water inside the pipe member. Therefore, in particular, the water flowing into the pipe material through the communication hole formed at the bottom of the pipe material on the upstream side of the pipe material flows inside the porous material on the upstream side of the pipe material toward the water surface. And rise,
That is, the oil in the water is sufficiently adsorbed by the porous material portion on the upstream side of the pipe material.

Thus, according to the above oil adsorbing means, the removal of oil from water can be performed more effectively.

According to a fifth aspect of the present invention, a copper material is installed in the water in the third tank.

Therefore, the water in the third tank is sterilized by the copper ions naturally generated from the copper material.

Therefore, since a conventional medicine is not used for sterilization, complicated work such as adjustment of the amount of the medicine is not required, and therefore, the work for purification is further simplified.

According to a sixth aspect of the present invention, a plurality of the first tanks are provided, and these are arranged in front and rear, and the oil-containing wastewater is introduced into the last one of the first tank groups in the first tank group. The oil-containing wastewater is caused to flow in series from the first tank to the first tank at the forefront, while the second tank and the third tank are juxtaposed in front and rear, and the second and third tanks are arranged side by side. The first tank group is stacked above the tank, and has the following effects.

That is, in the first tank, suspended solids are captured by filtration using a filter medium, and oil is absorbed by the oil adsorbing means. These will be the first maintenance work.
It needs to be taken out of the tank and removed.

In this case, as described above, the first
Since a plurality of tanks were provided and oil-containing wastewater was caused to flow in series in these first tank groups, comparing the first tanks with each other, first of all, the first tank in the rearmost first tank where oil-containing wastewater was introduced It is considered that the trapped amount and the adsorbed amount are maximized. Therefore, if maintenance work is performed for the last first tank for a predetermined period, the purification device can be normally operated without frequently performing maintenance work for all the first tanks.

Accordingly, since the maintenance work is not required for all the first tanks every predetermined period, the work for purification is simplified.

Further, according to the above configuration, both the rearmost first tank for introducing the oil-containing wastewater and the third tank for discharging the purified water after purification are arranged on the same rear side in the front-rear direction. It will be.

Therefore, the pipe for supplying the oil-containing wastewater to the purification device and the pipe for taking out the purified water from the purification device can be concentrated on one side before and after the purification device, and the oil-containing wastewater and the drainage water can be concentrated. Purified water can be easily managed, and the work for purification is also simplified in this respect.

Further, when a plurality of first tanks are provided,
These are arranged in front and rear, and on the other hand, the first tank group is stacked on the second and third tanks arranged in front and rear, so that the area of the purification device in plan view can be reduced.

Further, since the plurality of first tanks are arranged in front and rear as described above, the height of the first tank group can be reduced as compared with the case where only one single tank is provided. That is, even if the first tank group and the second and third tanks are stacked, it is possible to prevent the total height thereof from becoming too high.

Accordingly, since the purifying device is made compact in a plan view and a side view, there is also an effect that it can be easily installed in a narrow place.

[Brief description of the drawings]

FIG. 1 is an overall side view of a device for purifying oil-containing wastewater.

FIG. 2 is a partially enlarged side sectional view of FIG. 1;

FIG. 3 is a plan view of what is shown in FIG.

FIG. 4 is a partially enlarged partial sectional view of FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a view in which the pipe material of the oil absorbing means is flattened.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Purification apparatus 2 Filtration means 3 Oil adsorption means 4 Water treatment means 5 Sterilization means 6 Casing 9 1st tank 11 Filtration material 21 Pipe 26 Shaft center 27 Pipe material 29 Water surface 31 Porous material 36 Communication hole 38 Second tank 43 Third tank 44 Copper 46 Drain pump W ₀ Oil-containing drain W _{1 to} W ₃ Water W ₄ Purified water

Claims (6)

[Claims] A first tank, and a filter medium filled in the first tank, and a filter means for allowing oil-containing wastewater to pass upward through the filter medium; and the first tank. An oil adsorbing means for adsorbing oil contained in water passing through the filter medium and located above the filter medium; and a second tank for storing water drained from the oil adsorbent. A water treatment means for aerating water in the second tank and treating it with microorganisms; a third tank for storing water discharged from the water treatment means, and a sterilization means for sterilizing the water in the third tank And a purifying device for oil-containing wastewater comprising: 2. The method according to claim 1, wherein the filter medium is disposed in an upper portion of the first tank, and the oil-containing wastewater is introduced into a middle portion between an upper portion and a lower portion of the first tank. A purification device for oil-containing wastewater. 3. The oil-absorbing drainage means has an axial center extending substantially horizontally, and the oil-absorbing drainage is arranged so that a water surface in the first tank is located between an upper end surface thereof and the axial center in a vertical direction. A pipe material to be sunk, and a water-permeable porous material that is removably fitted into the pipe material, and a plurality of communication holes that communicate the inside and the outside of the pipe material are formed in an axial middle portion of the pipe material. The water that has passed through the filter material flows into the pipe material through the communication holes, flows toward the end of the pipe material, and drains from the end toward the second tank. The apparatus for purifying oil-containing wastewater according to claim 1, wherein the purification is performed. 4. The arrangement of the communication holes gradually transitions from the bottom to the top of the pipe material from the upstream side to the downstream side as viewed in the flow direction of water inside the pipe member. Item 4. An apparatus for purifying oil-containing wastewater according to Item 3. 5. The apparatus for purifying oil-containing wastewater according to claim 1, wherein a copper material is provided in the water in the third tank. 6. A plurality of the first tanks are arranged in a row in front and rear, and the first first tank group in the last of the first tank group is provided.
Oil impregnated drainage is introduced into the tank, and the oil impregnated drainage is caused to flow in series from the last first tank to the foremost first tank, while the second tank and the third tank are moved back and forth. The apparatus for purifying oil-containing wastewater according to any one of claims 1 to 5, wherein the first tank group is stacked above the second and third tanks.