JP2020054941A - Waste fluid disposal device - Google Patents

Abstract

To provide a waste fluid disposal device that has extremely simple configuration but can readily concentrate various kinds of waste fluid.SOLUTION: A waste fluid disposal device includes: sponge filters assembled into a multilayer structure that absorbs waste fluid; and a suction fan for forcibly drying the sponge filters, thereby inexpensively configuring a highly efficient waste fluid disposal device by combining low-cost articles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste liquid treatment device that concentrates waste liquid.

In many cases, a polymer wax is applied to a floor of a building as a flooring agent for the purpose of protection and aesthetics. This polymer wax is usually renewed regularly because dust is attached thereto, and the polymer wax is worn away due to mechanical abrasion, abrasion, and the like, and its function and appearance are deteriorated. In order to carry out recoating of the polymer wax, it is necessary to first peel off the already applied polymer wax from the floor surface as a pretreatment for repainting.
By performing the above-described regular recoating, a large amount of polymer wax stripping waste liquid (hereinafter simply referred to as “stripping waste liquid”) is generated in large quantities.

The stripping waste liquid is strongly alkaline and contains a large amount of an organic compound called a polymer wax. For this reason, rivers and even sewers cannot be drained as they are. This is because the pH balance of the sewage is disrupted by a large amount of the alkaline solution, which adversely affects the sludge decomposition treatment by bacteria.
However, the components of the stripping waste liquid are substantially constant. Therefore, by taking a standard procedure such as adding a predetermined chemical, stirring, and filtering, it is possible to remove impurities and organic compounds such as polymers from a large amount of stripped waste liquid at a much lower cost than a sewage treatment facility. Then, it can be purified to the extent that it can be discharged into rivers.

The present inventors have sought a technology for treating a stripped waste liquid in a form that is friendly to the natural environment through the work of building maintenance, and have applied for a patent for the technical content. Patent document 1 and patent document 2 are some of them.
In addition, the present inventors have applied the stripping waste liquid to a waste liquid generated by cleaning an air conditioner installed in a building facility or the like (hereinafter referred to as “air conditioner cleaning waste liquid”) or a waste liquid generated by cleaning a kitchen of a restaurant (hereinafter referred to as “oil and fat”). We have also found a way to treat "waste liquor"). Patent Document 3 discloses this technique.
Further, the present inventors have also proposed a method of purifying carpet washing waste liquid generated when washing a carpet with a synthetic detergent or washing waste liquid obtained by washing a diesel particulate collection filter by mixing with a surfactant and performing electrolysis. I found it. Patent Document 4 discloses this technique.

Japanese Patent No. 5894420 Japanese Patent No. 6162863 Japanese Patent No. 5602964 JP-A-2017-35686

Each of the stripping waste liquid treatment disclosed in Patent Literature 1 and Patent Literature 2, the cleaning waste liquid treatment for air conditioners and the like disclosed in Patent Literature 3, and the cleaning waste liquid treatment for carpets and the like disclosed in Patent Literature 4 has completed predetermined processing. The treated waste liquid from which the polluting components and dust are removed remains. However, in many cases, polluted components, dust, and the like cannot be completely removed from the treated waste liquid to such an extent that the waste liquid can be directly passed to a sewer. For this reason, if these treated waste liquids are allowed to flow into the sewer as it is, there is a possibility that an excessive load is imposed on the sewer.
In order to remove the polluted components, dust, and the like to such an extent that the treated waste liquid can be discharged to the sewer, a considerable cost is required.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a waste liquid treatment apparatus capable of easily concentrating various waste liquids with an extremely simple configuration.

In order to solve the above problems, a waste liquid treatment apparatus of the present invention includes a sponge filter formed of a sponge having open cells, a multilayer filter configured to store and store a plurality of sponge filters, and an intake fan provided on an uppermost layer of the multilayer filter. A waste liquid storage tank disposed at the lowermost layer of the multilayer filter, and a waste liquid pump for pumping the waste liquid stored in the waste liquid storage tank and flowing the waste liquid from the uppermost layer of the multilayer filter to the multilayer filter.
The multilayer filter has a bottom plate that supports the sponge filter and has a plurality of holes through which air and waste liquid can pass, and has a side wall that supports the bottom plate and blocks leakage of airflow formed by the intake fan. Is a structure capable of stacking and storing a plurality of sponge filters.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the waste liquid processing apparatus which can concentrate various waste liquid easily by a very simple structure.
Problems, configurations, and effects other than those described above will be apparent from the following description of the embodiments.

1 is an external perspective view illustrating a waste liquid treatment apparatus according to an embodiment of the present invention. It is an exploded perspective view of a waste liquid treating device. It is the schematic which shows the state before assembling a tray and a sponge filter. It is the schematic which shows the state after assembling a tray and a sponge filter. It is the schematic which shows the 1st process of the waste liquid processing which a waste liquid processing apparatus performs. It is the schematic which shows the state which completed the 1st process of the waste liquid processing which a waste liquid processing apparatus performs. It is the schematic which shows the 2nd process of the waste liquid processing which a waste liquid processing apparatus performs. It is a schematic diagram of a multilayer filter concerning a modification of the present invention.

[Overall configuration of waste liquid treatment apparatus 101]
FIG. 1 is an external perspective view showing a waste liquid treatment apparatus 101 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the waste liquid processing apparatus 101.
The waste liquid processing apparatus 101 includes a waste liquid storage tank 102, a multilayer filter 103, an intake fan 104, and a waste liquid pump 105.
As the waste liquid storage tank 102, for example, a drum can be used. In the experimental environment, a drum having an inner diameter of 567 mm and an inner height of 830 mm was used.
As the multilayer filter 103, a filter in which many trays 201 are stacked can be used. For example, as shown in FIG. 2, a tray in which a sponge filter 202 is sandwiched between a plurality of trays 201 is used. Note that the uppermost tray 201 is provided to hold the sponge filter 202, so that the sponge filter 202 is not laid on the bottom plate 201a. However, this does not apply when a wire mesh or the like that holds the sponge filter 202 is used.

The waste liquid processing apparatus 101 operates as follows.
First, the waste liquid pump 105 is operated to pump up the waste liquid 106 stored in the waste liquid storage tank 102 and to flow the waste liquid 106 from the uppermost layer of the multilayer filter 103 into the multilayer filter 103. Then, the waste liquid 106 permeates the sponge filter 202 in the multilayer filter 103.
Next, the waste liquid pump 105 is stopped, and the intake fan 104 is operated. Then, air is sucked in from the lowermost layer of the multilayer filter 103, passes through the sponge filter 202 in the multilayer filter 103, and is discharged by the intake fan 104. In the process, since the air contains the moisture of the waste liquid 106, the sponge filter 202 gradually dries over time.
The waste liquid treatment apparatus 101 alternately repeats the charging of the waste liquid 106 by the waste liquid pump 105 and the drying of the sponge filter 202 by the intake fan 104, thereby releasing the water in the waste liquid 106 to the atmosphere as water vapor and concentrating the waste liquid 106. Becomes possible.

FIG. 3 is a cross-sectional view showing a state before the trays 201 each having the sponge filter 202 laid on the bottom plate 201a are stacked.
FIG. 4 is a cross-sectional view showing a state after the trays 201 each having the sponge filter 202 laid on the bottom plate 201a are stacked.
As shown in FIG. 3 and FIG. 4, the side wall 201b of the tray 201 is inclined in a substantially tapered shape. By overlapping as shown in FIG. 4, a space D401 is formed between the bottom plates 201a of the overlapping trays 201. Is done. The sponge filter 202 is sandwiched in this space D401.

  As described above, in order for the tray 201 to support the sponge filter 202, it is an essential condition that the bottom plate 201a has a porous shape and that a hole is not formed in the side wall 201b in order to prevent air leakage. In the experimental environment, a seedling box 51 made of polypropylene (505 mm × 360 mm × 107 mm) made by Appleware Co., Ltd. was used. The tray 201 employed in the experimental environment was used as it was by fitting the four corners directly to the inner diameter of the drum, which is the waste liquid storage tank 102, when the size of the tray 201 did not match. In some cases, it may be necessary to appropriately provide a support frame for the multilayer filter 103 with a plywood, a timber, or the like.

  Further, in order to allow the sponge to transmit the waste liquid 106 and the air flow, the sponge must not be transiently compressed between the bottom plates 201a when the trays 201 are stacked. Therefore, when selecting the tray 201, an important check item is whether or not the space D401 formed when the trays 201 are overlapped is secured to the extent that the sponge filter 202 is not pressed.

The sponge filter 202 is a well-known sponge formed by subjecting a synthetic resin to a foaming process or the like, and for example, a general urethane sponge or a melamine sponge can be used. In order to allow the waste liquid 106 to permeate and allow the flow of air, it is an essential condition that the waste liquid 106 be an open-cell type having air permeability and water permeability. A closed-cell sponge manufactured and sold for use in shock absorption and the like cannot be used as the sponge filter 202 because it does not transmit air or water.
If the size of the bubbles formed in the sponge used for the sponge filter 202 is too small, the waste liquid 106 will not easily permeate, and the flow of air will also deteriorate. Conversely, if it is too large, the ability to hold the waste liquid 106 will be reduced. For this reason, a sponge manufactured and sold for use in transmitting air and water is preferable.
The size of the sponge filter 202 is desirably a shape that covers the entire surface of the bottom plate 201a of the tray 201 in order to effectively receive an air flow described later.

The description will be continued with reference to FIGS. 1 and 2 again.
The intake fan 104 is a blower for general business use. In the experimental environment, SJF-300RS manufactured by Siden Corporation was used. If the intake capacity or work of the intake fan 104 is too weak, the moisture of the waste liquid 106 cannot be effectively evaporated, and if it is too strong, the waste liquid 106 contained in the sponge filter 202 may be sucked out and fly. There is. Therefore, a stronger intake capacity is required to the extent that the waste liquid 106 is not sucked up and blown off. The required intake capacity mainly depends on the area and structure of the sponge filter 202. If the intake capacity is too strong, a speed control circuit such as an inverter may be provided to limit the intake capacity of the intake fan 104.
In addition, since the intake fan 104 alone cannot be fixed to the tray 201, a fixing plate 107 for fixing the intake fan 104 with a plywood or the like is formed. The fixing plate 107 is necessary for fixing the intake fan 104 and for concentrating the air flow of the intake fan 104 on the multilayer filter 103.

A discharge hose 108 of a waste liquid pump 105 is connected to the fixed plate 107, and the waste liquid 106 pumped from the waste liquid storage tank 102 through the suction hose 109 by the waste liquid pump 105 is discharged from the multilayer filter 103 on which the fixed plate 107 is installed. Injected from the upper layer.
The waste liquid pump 105 only needs to have a capability of sucking up the waste liquid 106 from the waste liquid storage tank 102 to the uppermost layer of the multilayer filter 103. However, due to the transport of the waste liquid 106, it is hard to cause clogging by dust in the waste liquid 106 if possible. Are preferred.

  The power cords of the intake fan 104 and the waste liquid pump 105 are connected to a timer switch 110. The timer switch 110 exclusively connects the AC power supply 111 to the waste liquid pump 105 or the intake fan 104. The timer switch 110 connects the AC power supply 111 to the waste liquid pump 105 for one minute, then disconnects the waste liquid pump 105 from the AC power supply 111 and connects the AC power supply 111 to the intake fan 104 for one hour. This operation is repeated.

FIG. 5 is a schematic diagram illustrating a first step of the waste liquid treatment performed by the waste liquid treatment apparatus 101.
FIG. 6 is a schematic diagram illustrating a state in which the first step of the waste liquid processing performed by the waste liquid processing apparatus 101 has been completed.
FIG. 7 is a schematic diagram illustrating a second step of the waste liquid processing performed by the waste liquid processing apparatus 101.

First, as shown in FIGS. 1 and 5, when the timer switch 110 connects the AC power supply 111 to the waste liquid pump 105, the waste liquid pump 105 operates for one minute.
Then, the waste liquid 106 is pumped from the waste liquid storage tank 102 through the suction hose 109, and the waste liquid 106 flows into the multilayer filter 103 from the uppermost layer of the multilayer filter 103 through the discharge hose 108. Thereby, as shown in FIG. 6, the waste liquid 106 permeates the sponge filter 202 in the multilayer filter 103. In FIG. 6, the sponge filter 202 is hatched to show a state in which the waste liquid 106 has permeated.
Excess waste liquid 106 that cannot be completely absorbed into the sponge filter 202 leaks out of a hole formed in the bottom plate 201a of the tray 201 located at the lowermost layer of the multilayer filter 103, and returns to the waste liquid storage tank 102 again.

  Next, as shown in FIG. 7, when the timer switch 110 disconnects the connection between the waste liquid pump 105 and the AC power supply 111, the waste liquid pump 105 stops. Then, when the timer switch 110 connects the AC power supply 111 to the intake fan 104, the intake fan 104 is operated, for example, for one hour, and the motor 501 of the intake fan 104 drives the propeller 502 to rotate. Then, air is sucked in from the lowermost layer of the multilayer filter 103, passes through the sponge filter 202 in the multilayer filter 103, and is discharged by the intake fan 104 to form an airflow R701. In the process, since the air passing through the sponge filter 202 contains the moisture of the waste liquid 106, the sponge filter 202 gradually dries over time.

[Experimental results of waste liquid treatment apparatus 101]
Hereinafter, the experimental results of the waste liquid treatment apparatus 101 will be described.
The operation setting of the waste liquid processing apparatus 101 is such that the supply of the waste liquid 106 by the waste liquid pump 105 and the drying operation by the suction fan 104 are performed for 1 minute and the drying operation is repeated, except for the experiment in which the drying operation time is changed. For 50 hours.
<1> Number of trays 201 and sponge filter 202 layers and processing capacity The number of stacked trays 201 was changed to 10, 20, and 30 steps, and the waste liquid concentration processing capacity in each case was measured. The measurement is performed by subtracting the liquid level of the waste liquid 106 remaining in the waste liquid storage tank 102 at the end of the experiment from the liquid level of the waste liquid 106 stored in the waste liquid storage tank 102 at the start of the experiment. The volume of the water evaporated from the waste liquid 106 was calculated based on the inner diameter of.
Tray 10 tiers: about 11.4 liters Tray 20 tiers: about 16.4 liters Tray 30 tiers: about 22.7 liters From the above experimental results, it can be determined that the tray 30 tier has the highest moisture evaporation capacity.
In addition, the number of trays exceeding 30 steps may be inconsistent with the structure of the waste liquid treatment apparatus 101 unless a tower, a frame, or the like for supporting the multilayer filter 103 is constructed due to the structure of the multilayer filter 103. Has not been realized.

<2> Drying operation time The drying operation time was changed to 1 hour, 2 hours, and 5 hours, and the waste liquid concentration treatment capacity in each case was measured.
1 hour: Approximately 22.7 liters 2 hours: Approximately 15.2 liters 5 hours: Approximately 5.1 liters From the above experimental results, it is determined that the water evaporation treatment capacity is highest when the drying operation time is set to 1 hour. it can.
Note that depending on the weather, there is a possibility that the waste liquid concentration process can be further advanced by setting the drying operation time to a time shorter than 1 hour, for example, about 30 minutes.

<3> Presence or absence of interlayer gap The waste liquid concentration treatment capacity was measured in each case where a 10 mm spacer was inserted between the trays 201 constituting the multilayer filter 103 and where no spacer was inserted.
Without a spacer: about 22.7 liters With a spacer: about 20.2 liters From the above experimental results, it can be determined that the case where no spacer is inserted has a high water evaporation capacity.

<4> Size of Sponge Filter 202 The size of the sponge filter 202 was 400 mm × 200 mm and 200 mm × 200 mm, and the waste liquid concentration treatment capacity in each case was measured.
400 mm × 200 mm: about 22.7 liters 200 mm × 200 mm: about 17.7 liters From the above experimental results, it is better to cover the sponge filter 202 with a wide area that covers the entire surface of the bottom plate 201 a of the tray 201 as much as possible. Is high.

<5> Type of sponge filter 202 One urethane sponge of 400 mm × 200 mm, two layers of urethane sponge of 400 mm × 200 mm, one sheet of melamine sponge of 400 mm × 200 mm, and two pieces of melamine sponge of 400 mm × 200 mm The waste liquid concentration treatment capacity in each case was measured for the stacked sheets.
One urethane sponge: about 22.7 liters Two urethane sponges: about 10.1 liter One melamine sponge: about 30.3 liters Two melamine sponges: about 15.2 liters From the above experimental results, the sponge filter When one melamine sponge is used for 202, it can be determined that the water evaporation capacity is the highest.
However, since melamine sponge is twice as expensive as urethane sponge, it can be determined that one urethane sponge is the best option in consideration of cost effectiveness.

  The waste liquid processing apparatus 101 described above evaporates the water of the waste liquid 106 and concentrates the waste liquid 106. Since the water evaporates, there is no need to flow the waste liquid 106 into the sewer. Since the waste liquid 106 to be treated originally is a treated waste liquid generated by the treatment described in Patent Documents 1, 2, 3, or 4, even if the concentration treatment is performed, polluting components, dust, and the like are immediately discharged to the waste liquid storage tank. It does not stay at 102. By repeating the treatment to some extent, the polluting components and dusts and the like become stagnant to the extent that they can be visually recognized. Together with the solidification.

In addition, although it is possible to process the waste liquid 106 to be processed in Patent Documents 1, 2, 3, or 4 without being processed by the waste liquid processing apparatus 101 according to the embodiment of the present invention, it is not so recommended.
In the case of the polymer wax treatment waste liquid to be treated in Patent Literatures 1 and 2, since it is alkaline containing caustic soda, there is a possibility that the urethane sponge may be quickly deteriorated particularly when a urethane sponge is used for the sponge filter 202. . However, on the assumption that the urethane sponge is disposable instead of the filter, the treatment may be performed by the waste liquid treatment apparatus 101 according to the embodiment of the present invention in order to concentrate the polymer wax treatment waste liquid.
Also, in the case of a waste liquid containing a fat component to be treated in Patent Document 3 or a waste liquid containing fine dust such as carbon powder to be treated in Patent Document 4, the sponge filter 202 detects the fat component and dust. This also degrades prematurely, causing clogging.
That is, since the concentration processing of the untreated waste liquid causes the sponge filter 202 to deteriorate at an early stage, it is determined whether or not to perform the processing in consideration of the running cost of the sponge filter 202.

The embodiment of the present invention described above can be modified as follows.
(1) In the above embodiment, the multilayer filter 103 is constituted by the synthetic resin tray 201, but the multilayer filter 103 does not necessarily have to be the tray 201. A bottom plate 201a that supports the sponge filter 202 and has a plurality of holes through which the air and the waste liquid 106 can pass, supports the bottom plate 201a without pressing the sponge filter 202 laid on the bottom plate 201a more than necessary, and an intake fan Any structure may be used as long as it has a side wall 201b that blocks the leakage of the airflow formed by the airbag.
For example, a function equivalent to that of the tray 201 can be realized even if a frame is made of wood or the like and a wire mesh is fitted. However, in consideration of the availability, handiness, light weight, and good air blocking performance of the side wall 201b, the tray 201 made of a synthetic resin other than a specially designed one shows very good performance.

Alternatively, as shown in FIG. 8, a door 803 is provided on a side wall of one side of a rectangular prism-shaped housing 802 having a hollow top plate and a bottom plate omitted, and a wire mesh 804 and a sponge filter 202 are alternately provided from the door 803. The multilayer filter 801 can also be configured by inserting the stacked filter. In this case, the wire mesh 804 corresponds to the bottom plate 201a in FIG. 1, and the housing 802 corresponds to the side wall 201b. Note that the tray 201 is a valid option as a component of the multilayer filter 103, but is not essential.
That is, the multilayer filter 103 is a structure that can store a plurality of sponge filters 202 in a stack by having a plurality of bottom plates 201a, and has a plurality of holes that support the sponge filter 202 and allow air and waste liquid 106 to pass therethrough. The bottom plate 201a and the side wall 201b that blocks leakage of the airflow formed by the intake fan are essential components. The side wall 201b is formed to support the bottom plate 201a without pressing the sponge filter 202 laid on the bottom plate 201a more than necessary.

  (2) As described above, the waste liquid 106 to be processed in Patent Documents 1, 2, 3, or 4 can be processed without being processed by the waste liquid processing apparatus 101 according to the embodiment of the present invention. At this time, in order to prevent deterioration due to clogging of the uppermost sponge filter 202 mixed in the waste liquid 106, a nonwoven fabric is laid on the sponge filter 202, and contaminants and dust contained in the waste liquid 106 are removed. Etc. may be removed with a non-woven fabric.

  (3) The waste liquid processing apparatus 101 according to the embodiment of the present invention aims to evaporate water from the waste liquid 106. In order to efficiently evaporate water from the waste liquid 106, the larger the contact area between the waste liquid 106 and the air, the faster the water can be evaporated. That is, the larger the area of the multilayer filter 103 is, the more the concentration efficiency of the waste liquid 106 is improved. Therefore, it is not always necessary to be bound by the size of the waste liquid storage tank 102. In the above-described embodiment, the size of the tray 201 is selected so as to match the inner diameter of the drum that is the waste liquid storage tank 102. However, this is only for convenience of realizing the device easily and quickly by combining commercially available products. It was just such a selection. If a structure that supports the multilayer filter 103 on the waste liquid storage tank 102 without being fitted into the drum can is prepared, the tray 201 and the like can be freely selected and designed without being restricted by the size of the waste liquid storage tank 102. It becomes possible.

  (4) In order to efficiently evaporate water from the waste liquid 106, the lower the humidity of the air in contact with the waste liquid 106, the faster the water can evaporate. Therefore, by heating the room in which the waste liquid treatment apparatus 101 is installed by heating, it can be expected that the waste liquid concentration processing can proceed more efficiently. In particular, since the humidity is high in rainy weather, it is effective to use heating to reduce the humidity. When the room is large, a simple thermostat for accommodating the waste liquid treatment apparatus 101 may be built. A similar effect can be expected even if the waste liquid 106 itself is heated by a heater or the like.

  (5) In the waste liquid treatment apparatus 101 according to the embodiment of the present invention, the timer switch 110 exclusively operates the waste liquid pump 105 and the intake fan 104, but it is not always necessary that the timer switch 110 be exclusive. The waste liquid pump 105 and the intake fan 104 may be operated simultaneously within a range not exceeding the power supply amount of the power supply.

  (6) In the above experiment, the timer switch 110 operates the waste liquid pump 105 for one minute and the intake fan 104 for one hour, but the operating time of the waste liquid pump 105 and the intake fan 104 is not necessarily limited to these times. . For example, the timer switch 110 is configured by a microcomputer, and a humidity sensor is installed inside the multilayer filter 103 or near the air supply or exhaust port of the intake fan 104, and the humidity sensor is connected to the microcomputer. Then, the microcomputer measures the humidity of the airflow that has passed through the multilayer filter 103. When it is detected that the humidity of the air flow has decreased by a predetermined rate immediately after the waste liquid pump 105 is stopped, a program of the microcomputer can be configured to operate the waste liquid pump 105 again.

In the embodiment of the present invention, the waste liquid treatment apparatus 101 is disclosed.
The waste liquid 106 pumped from the waste liquid storage tank 102 by the waste liquid pump 105 is supplied from the uppermost layer of the multilayer filter 103, and the waste liquid 106 permeates the sponge filter 202 in the multilayer filter 103. Next, the intake fan 104 is operated. Then, air is sucked in from the lowermost layer of the multilayer filter 103, passes through the sponge filter 202 in the multilayer filter 103, and is discharged by the intake fan 104. In the process, since the air contains the moisture of the waste liquid 106, the sponge filter 202 gradually dries over time.
By assembling the sponge filter 202 into which the waste liquid 106 is impregnated into a multilayer structure and forcibly drying the sponge filter 202 with the intake fan 104, low-cost articles are combined to construct a highly efficient waste liquid treatment apparatus 101 at low cost. be able to.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and other modified examples and application examples may be provided without departing from the gist of the present invention described in the claims. including.

DESCRIPTION OF SYMBOLS 101 ... Waste liquid processing apparatus, 102 ... Waste liquid storage tank, 103 ... Multilayer filter, 104 ... Intake fan, 105 ... Waste liquid pump, 106 ... Waste liquid, 107 ... Fixing plate, 108 ... Discharge hose, 109 ... Suction hose, 110 ... Timer switch 111, AC power supply, 201, tray, 201a, bottom plate, 201b, side wall, 202, sponge filter, 501, motor, 502, propeller, 801, multilayer filter, 802, housing, 803, door, 804, wire mesh

Claims (2)

A sponge filter comprising a sponge having open cells;
A multilayer filter in which a plurality of the sponge filters are stacked and housed,
An intake fan provided on the uppermost layer of the multilayer filter,
A waste liquid storage tank disposed at the lowermost layer of the multilayer filter,
A waste liquid pump for pumping the waste liquid stored in the waste liquid storage tank and flowing the waste liquid from the uppermost layer of the multilayer filter to the multilayer filter,
The multilayer filter,
A bottom plate having a plurality of holes that support the sponge filter and allow air and the waste liquid to pass therethrough,
A side wall that supports the bottom plate and blocks leakage of airflow formed by the intake fan,
A structure capable of storing a plurality of the sponge filters in a stacked manner by having a plurality of the bottom plates,
Waste liquid treatment equipment. The multilayer filter is configured by stacking a tray having the bottom plate and the side wall,
The waste liquid treatment device according to claim 1.

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