JPH1133307A - Liquid recycling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an included oil from finding its way into a final tank by installing particulate laminates on the lower part of a final chamber. SOLUTION: First, a liquid to be purified which is fed into a first tank 3 is filtered in a space between particulate bodies. The most of the included oil is afloat on the liquid level in the first tank 3 to be delivered to the outside of a pretreatment tank 1. Next, a liquid in a second tank 5 overflows a notched part 13 on the upper part of a partition 12 flowing into an intermediate tank 11. The liquid flowing into the intermediate tank 11 causes the included oil to float to the liquid level with the help of partitions 14-17 to be delivered to the outside of the intermediate tank 11. On the other hand, an included fine oil particle is flocculated by an adsorbent 35 to float on the liquid level passing through a filter 34 and finally to be delivered to the outside of the intermediate tank 11. A final tank 18 is connected to the lower part of the final chamber 19 of the intermediate tank 11, and this final chamber 19 is loaded with particulate laminates, so that the included oil is prevented from finding its way into the final tank 18. The purified liquid is delivered to the outside of the final tank 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, car wash wastewater,
The present invention relates to a liquid recycling apparatus capable of recycling waste liquid containing a large amount of waste water, mold release agent, sludge, oil, and the like.

[0002]

2. Description of the Related Art Conventionally, wastewater containing a large amount of sludge and oil, such as car wash wastewater, drainage wastewater, mold release agent, etc., has no method of effectively removing the sludge and removing the mixed oil.
It was not recycled at all.

[0003]

That is, in the prior art,
For example, when trying to remove sludge, the filter is quickly clogged because a filter is used.
There was a problem that could not be recycled. Also, when trying to remove the mixed oil, this oil and sludge are mixed,
There was a problem that it became sticky and could not be recycled at all.

[0004] The present invention has been made to solve the above-mentioned problems of the prior art.

The invention of claim 1 firstly comprises a pretreatment tank,
The liquid to be purified poured into the first tank is filtered through a gap between a plurality of granular materials placed in a stack, and the first tank and the second tank are communicated at a lower portion, thereby causing a difference in specific gravity. The sludge having a high specific gravity is settled at the bottom of the pretreatment tank by using the method.
In addition, when the majority of the mixed oil passes through the gap between the plurality of granular materials, they contact each other to form a large lump, and float on the liquid surface of the first tank due to a difference in specific gravity. Further, high-viscosity oil such as grease cannot pass through the gap between the plurality of granular materials and floats on the liquid surface of the first tank. Subsequently, in the intermediate tank, a liquid passage is formed in a zigzag manner in a horizontal direction or a vertical direction by a partition wall, so that the mixed oil floats on the liquid surface with a specific gravity difference and is separated. Further, the liquid in the intermediate tank is circulated and filtered by an agglomerated filter to agglomerate the fine particles in the liquid and removed as a large lump by a filter built in the agglomerated filter, and the fine particles in the liquid are removed. The oil is agglomerated, floated on the liquid surface as a large lump, and separated and collected. In the final stage, the lower part of the final chamber of the intermediate tank and the final tank are communicated with each other through a communication passage, and
Alternatively, it is another object of the present invention to provide a liquid recycling apparatus in which a plurality of granular materials are stacked and installed in a communication path, and in which mixed oil is prevented from entering a final tank in a gap between the plurality of granular materials.

[0005]

[Means for Solving the Problems]

1. A pretreatment tank comprising a first tank into which a liquid to be purified is poured, a second tank connected to a lower part of the first tank by a communication passage, a mesh-like body or a porous body. A plurality of granules which are stacked and installed in the first tank sandwiched between the upper and lower surfaces made of a body and filter the liquid to be purified poured into the first tank by passing through the stacked gaps. An intermediate tank that communicates with the body and the second tank via an upper portion of the partition wall, and a liquid in the second tank overflows the partition wall and flows therein; and the intermediate tank is provided in the intermediate tank. A plurality of partition walls forming a flow passage of the liquid in the left-right direction, or a zigzag in the up-down direction, a final tank communicated with a lower part of the final chamber of the intermediate tank by a communication passage, a mesh or a porous body Top and bottom A pinched, at the bottom of the final chamber,
Alternatively, a plurality of granular materials that are installed in a stacked manner in the communication path communicating with the lower portion and that filter the liquid flowing into the final tank by passing through the stacked gaps,
An outlet for taking out the liquid in the final tank to the outside, a cylindrical filter provided on a central axis, and an adsorbent provided so as to surround the outer periphery of the cylindrical filter, A coagulation type filtration device for circulating and filtering the liquid,
And an oil outlet for collecting oil floating on the liquid surface of the intermediate tank.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a flowchart showing one embodiment of the present invention, and FIG.
Is a plan view showing details of the tank of FIG. 1, FIG. 3 is a front view of FIG. 2, FIG. 4 is a side view of FIG. 2, and FIG. 5 is a detail of the back filter and the coagulation type filtration device of FIG. Plan view, FIG. 6
Is a front view of FIG. 5, and FIG. 7 is a side view of FIG. In the figure, a pretreatment tank 1 is composed of a first tank 3 into which a liquid to be purified is poured from an inlet 2, and a second tank 5 connected to a lower part of the first tank 3 by a communication passage 4. Multiple granular materials 6
Is made of, for example, polypropylene of 3 mmφ to 10 mmφ, and the upper surface 7 and the lower surface 8 are housed in a basket 9 made of a mesh-like or porous body, are stacked in the first tank 3, and are installed in plural numbers. The liquid to be purified poured into 3 is filtered by passing through the stacked gaps. The handle 10 is attached to the basket 9 and pulls the basket 9 upward. The intermediate tank 11 communicates with the second tank 5 through a notch 13 provided above the partition wall 12, and the liquid in the second tank 5 overflows the notch 13 of the partition wall 12 and flows therein. . The plurality of partition walls 14, 15, 16, 17 are provided in the intermediate tank 11, and form a liquid flow passage in a left-right direction or a vertical direction in a zigzag manner. The final tank 18 communicates with a lower portion of the final chamber 19 of the intermediate tank 12 through a communication passage 20. The plurality of granular bodies 21 are made of, for example, polypropylene of 3 mmφ to 5 mmφ, and the upper surface 22 and the lower surface 23 are housed in a basket 24 formed of a mesh or porous body, and are provided at the lower part of the final chamber 19 or in the communication passage. 20 and a plurality of stacked tanks, the final tank 1
8 is prevented from entering the laminated gaps. The handle 25 is attached to the basket 24 and lifts the basket 24 upward. The series circuit of the back filter 26 and the coagulation type filtration device 27, and the back filter 28 and the coagulation type filtration device 29
Each is connected in parallel to the final chamber 19 of the intermediate tank 11.
And the first chamber 3 of the intermediate tank 11
The liquid in the intermediate tank 11 is circulated and filtered through a pump 33 between valves 32 provided in the apparatus 1. The coagulation type filtration devices 27 and 29 are each provided with a cylindrical filter 34 provided on a central axis and the cylindrical filter 3.
4 and a special adsorbent 35 mainly containing magnesium, for example. The liquid outlet 36 is provided in the final tank 18 and takes out the purified liquid. The oil outlet 37 extracts oil floating on the liquid surface of the intermediate tank 11. The oil outlet 38 takes out the oil floating on the liquid surface of the pretreatment tank 1. Feedback mouth 3
When the gap between the granular bodies 6 is clogged and the liquid level of the first tank 3 becomes equal to or higher than a predetermined level, the liquid 9 returns to the original tank or the spare tank by overflowing the liquid at or above the predetermined level. The differential pressure gauge 40 is a back filter 2
When the differential pressure between the IN-side pressure and the OUT-side pressure of 6, 28 becomes, for example, 1 kgf / cm ² , the contacts are activated and the operation of the operation panel 41 stops the pump 33. Pressure gauge 4
2 is that the internal pressure of the coagulation type filtration devices 27 and 29 is, for example, 4K
When the pressure reaches gf / cm ² , the contacts are activated and the operation of the operation panel 41 stops the pump 33.

Next, the operation will be described. First, in the pretreatment tank 1, the liquid to be purified poured into the first tank 3 from the injection port 2 is stored in a basket 9 whose upper surface 7 and lower surface 8 are formed of a mesh or porous body, and are stacked. The filtration is performed in the gap between the plurality of granular bodies 6 that are installed. Since the liquid after filtration flows into the second tank 5 from the lower part of the first tank 3 through the communication path 4, sludge having a high specific gravity mixed into the liquid precipitates on the bottom of the pretreatment tank 1 due to a difference in specific gravity. I do.
In addition, the majority of the mixed oil of the liquid to be purified comes into contact with each other when passing through the gap between the granular bodies 6 to form a large lump,
It floats on the liquid surface of the first tank 3 due to the specific gravity difference, and is taken out of the pretreatment tank 1 from the oil outlet 38. Furthermore, high-viscosity mixed oil such as grease cannot pass through the inter-gap of the granular material 6,
It floats on the liquid surface of the first tank 3, and is similarly taken out of the pretreatment tank 1 from the oil outlet 38. Further, when the gap between the granular bodies 6 is clogged and the liquid level of the first tank 3 becomes higher than a predetermined level, the liquid above the predetermined level is fed to the feedback port 39.
For example, by the overflow, the tank is returned to the original tank or the spare tank. Subsequently, in the intermediate tank 11, the liquid in the second tank 5 of the pretreatment tank 1
2 flows into the notch 13 provided at the upper part of the nozzle 2. The liquid that has flowed into the intermediate tank 11 forms a zigzag passage in the left-right direction or the up-down direction on the plurality of partition walls 14 to 17, and the oil mixed in the liquid floats on the liquid surface due to a difference in specific gravity. Then, the oil is taken out of the intermediate tank 11 from the oil outlet 37. Further, the liquid in the intermediate tank 11 is circulated and filtered by the back filters 26 and 28 and the agglutination type filtration devices 27 and 29 by the pump 33, and the fine particles mixed in the liquid are agglomerated by the special adsorbent 35 and several hundreds. It becomes twice as large and is filtered by the filter 34. On the other hand, fine oil that is emulsified and mixed in liquid
It is aggregated by the special adsorbent 35 to form a large lump of several hundred times, but it is elongated and deformed by the pressing force of the pump 33, passes through the filter 34 and floats on the liquid surface, and flows from the oil outlet 37 to the intermediate tank 11. It is taken out. As a final stage, in the final tank 18, the final tank 18 is the intermediate tank 1
2 and a lower portion of the final chamber 19, which communicates with the communication passage 20;
In addition, in the lower part of the final chamber 19 or the communication passage 20,
The granules 21 housed in the granules 4 are stacked and installed.
The gap 1 prevents the mixed oil from entering the final tank 18. The liquid thus purified is taken out of the final tank 18 through the liquid outlet 36.

FIG. 8 is a plan view showing another embodiment of the intermediate tank 11, and FIG. 9 is a plan view showing a specific example of the partition wall of FIG. In the figure, partition walls 14 to 17 are each configured as shown in FIG.
And a hinge 45 for opening and closing the pair of frame members 43, 44, a bar 46 attached to the pair of frame members 43, 44, and a pair of frame members 43, 44. A fluffy material 47 made of, for example, a non-woven fabric, an opening 48 formed of a portion having no fluffy material 47, and a frame 4
3 and a notch 50 provided in the frame 44. The guide 51 is formed, for example, by vertically attaching a pair of L-shaped steels to the inner surface of the side wall of the intermediate tank 11 at an interval, and installs the partition walls 14 to 15 shown in FIG.

Next, the operation will be described. In FIG. 8, the liquid that has flowed into the intermediate tank 11 flows in a zigzag manner in the left-right direction by the partition walls 14 to 15, the sludge in the liquid is trapped by the fluffy substance 47, and sinks to the bottom of the intermediate tank 11, Liquid outlet 52 provided at the bottom of intermediate tank 11
Then, the liquid is sent to the back filters 26, 28 and the coagulation type filtration devices 27, 29 by the pump 33, and after purification, returns to the inside of the intermediate tank 11 from the liquid inlet 53 provided at the bottom of the intermediate tank 11. On the other hand, the emulsified fine oil in the liquid is caught by the fluffy substance 47 and contacts each other to form a large lump, then floats on the liquid surface of the intermediate tank 11, 11 is taken out.

When the above embodiment is applied to, for example, recycling of car wash wastewater at a gas station, the surfactant mixed into the wastewater cannot be removed, the concentration thereof gradually increases, and the concentration of the surfactant gradually increases. It can no longer be used. In this case, only the final cleaning water, tap water is used, or only at the time of the final cleaning, the liquid from the liquid outlet 36 is supplied to the UF.
It may be purified by a membrane or the like to remove the surfactant before use. Further, the liquid in the pretreatment tank 1, the intermediate tank 11, and the final tank 18 may be periodically cleaned with a UF film or the like, for example, for one month to remove the accumulated surfactant.

Further, if the above embodiment is incorporated into a ship such as a tanker and used as a large-flow treatment device, it can be applied to countermeasures against a heavy oil spill accident due to tanker stranded and measures against the red tide in the sea.

[0012]

As described above,

According to the first aspect of the present invention, first, in the pretreatment tank, the liquid to be purified poured into the first tank is filtered through the gaps between the plurality of granules that are stacked and installed. By communicating the two tanks with the lower part of the first tank, sludge having a high specific gravity is settled at the bottom of the pretreatment tank by utilizing a specific gravity difference. In addition, the majority of the mixed oil, when passing through the inter-gap of a plurality of granular materials, contact each other to form a large lump,
It floats on the liquid surface of the first tank due to the specific gravity difference. Further, high-viscosity oil such as grease cannot pass through the gap between the plurality of granular materials and floats on the liquid surface of the first tank. Subsequently, in the intermediate tank, a liquid passage is formed in a zigzag manner in a horizontal direction or a vertical direction by a partition wall, so that the mixed oil floats on the liquid surface with a specific gravity difference and is separated. Further, the liquid in the intermediate tank is circulated and filtered by an agglomerated filter to agglomerate the fine particles in the liquid and removed as a large lump by a filter built in the agglomerated filter, and the fine particles in the liquid are removed. The oil is agglomerated, floated on the liquid surface as a large lump, and separated and collected. As a final step, the lower part of the final chamber of the intermediate tank and the final tank are communicated with each other through a communication path, and a plurality of granules are stacked and installed in the lower part of the final chamber or the communication path to form a plurality of granules. Since the gap prevents the mixed oil from entering the final tank, the sludge and the liquid containing a large amount of mixed oil can be effectively recycled.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of a liquid recycling apparatus according to the present invention.

FIG. 2 is a plan view showing details of a tank shown in FIG. 1;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a plan view showing details of a back filter and a coagulation-type filtration device of FIG. 1;

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a side view of FIG.

FIG. 8 is a plan view showing another embodiment of the intermediate tank of FIG. 2;

FIG. 9 is a plan view showing a specific example of the partition wall in FIG.

[Explanation of symbols]

 1: Pretreatment tank 2: Injection port 3: First tank 4: Communication path 5: Second tank 6: Granular material 7: Upper surface 8: Lower surface 11: Intermediate tank 12: Partition wall 14-17: Partition wall 18: Final Tank 19: Final chamber 20: Communication path 21: Granular body 22: Upper surface 23: Lower surface 27, 29: Agglomerated filter 34: Cylindrical filter 35: Adsorbent 36: Liquid outlet 37, 38: Oil outlet

Claims (1)

[Claims] 1. A pretreatment tank including a first tank into which a liquid to be purified is poured, a second tank connected to a lower part of the first tank by a communication passage, and an upper surface formed of a mesh or a porous body And a plurality of granular materials that are sandwiched between lower surfaces and are stacked and installed in the first tank, and filter the liquid to be purified poured into the first tank by passing through the stacked gaps. An intermediate tank that communicates with the second tank via an upper part of the partition wall, and in which the liquid in the second tank overflows and flows in the upper part of the partition wall; A plurality of partition walls forming a liquid flow passage in a zigzag manner in the left-right direction or in the up-down direction; a final tank communicated with a lower part of the final chamber of the intermediate tank by a communication passage; The upper surface consisting of the body and The liquid flowing into the final tank is filtered by passing through the inter-laminate, A plurality of granules for preventing the mixed oil from flowing into the final tank; an outlet for extracting the liquid in the final tank to the outside; a cylindrical filter provided on a central shaft; and an outer periphery of the cylindrical filter. An agglomerated filtration device comprising an adsorbent installed so as to surround and circulating and filtering the liquid in the intermediate tank, and an oil outlet for collecting oil floating on the liquid surface of the intermediate tank, A liquid recycling apparatus characterized by the following.