JP7084032B2 - Waste liquid treatment equipment - Google Patents

Description

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

In many cases, polymer wax is applied as a flooring agent to the floor surface of a building for the purpose of protection and aesthetics. This polymer wax is usually repainted on a regular basis because it is worn by dust, mechanical scratches, abrasion, etc., and its function and appearance are deteriorated. In order to repaint the polymer wax, the polymer wax that has already been applied must first be peeled off from the floor surface as a pretreatment for repainting.
By performing the above-mentioned periodic repainting, a large amount of polymer wax exfoliation waste liquid (hereinafter, simply abbreviated as "peeling waste liquid") is generated.

The stripping waste liquid is strongly alkaline and contains a large amount of an organic compound called polymer wax. For this reason, it cannot be drained into the sewer as it is, let alone the river. This is because the pH balance of sewage is disturbed by a large amount of alkaline liquid, which adversely affects the sludge decomposition treatment by bacteria.
However, the components of the exfoliated waste liquid are substantially constant. Therefore, by taking routine procedures such as adding a predetermined chemical, stirring, and filtering, impurities and organic compounds such as polymers can be removed from a large amount of exfoliation waste liquid at a much lower cost than a sewage treatment facility. Then, it is possible to purify it to the extent that it can be discharged into the river.

Through the work of building maintenance, the inventors have sought a technique for treating the exfoliated waste liquid in a form that is friendly to the natural environment, and have applied for a patent on the technical content. Patent Document 1 and Patent Document 2 are a part of them.
In addition, the inventors have applied the peeling waste liquid to the waste liquid generated by cleaning the air conditioner installed in the building equipment (hereinafter referred to as "air conditioner cleaning waste liquid") and the waste liquid generated by cleaning the kitchen of a restaurant (hereinafter referred to as "oil and fat"). We also found a way to treat the waste liquid "). Patent Document 3 discloses this method.
Furthermore, the inventors have a method of purifying the carpet cleaning waste liquid generated when cleaning the carpet with a synthetic detergent and the cleaning waste liquid obtained by cleaning the diesel fine particle collection filter by mixing with a surfactant and electrolyzing the waste liquid. I found it. Patent Document 4 discloses this method.

Japanese Patent No. 5894420 Japanese Patent No. 6162863 Japanese Patent No. 5602964 Japanese Unexamined Patent Publication No. 2017-35686

All of the stripping waste liquid treatment disclosed in Patent Document 1 and Patent Document 2, the cleaning waste liquid treatment for air conditioner etc. disclosed in Patent Document 3, and the cleaning waste liquid treatment for carpet etc. disclosed in Patent Document 4 have been completed. After that, the treated waste liquid from which pollutant components and dust have been removed remains. However, in many cases, the treated waste liquid cannot completely remove pollutants, dust, etc. to the extent that it can be drained into the sewer as it is. Therefore, if these treated waste liquids are directly flowed into the sewerage system, the sewerage system may be overloaded.
Then, it costs a considerable amount of money to remove pollutant components, dust, etc. to the extent that the treated waste liquid can be discharged to the sewer.

The present invention has been made in view of such circumstances, 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, the waste liquid treatment apparatus of the present invention includes a sponge filter made of a sponge having open cells, a multi-layer filter for laminating and storing a plurality of sponge filters, and an intake fan provided on the uppermost layer of the multi-layer filter. It is provided with a waste liquid storage tank arranged in the lowermost layer of the multi-layer filter and a waste liquid pump for pumping up the waste liquid stored in the waste liquid storage tank and pouring the waste liquid from the uppermost layer of the multi-layer filter into the multi-layer filter.
The multi-layer filter has a bottom plate that supports a sponge filter and has a plurality of holes that allow air and waste liquid to pass through, and a side wall that supports the bottom plate and blocks airflow leakage formed by an intake fan. It is a structure that can stack and store a plurality of sponge filters by having a plurality of sponge filters.

According to the present invention, it is possible to provide a waste liquid treatment apparatus capable of easily concentrating various waste liquids with an extremely simple configuration.
Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

It is an external perspective view which shows the waste liquid treatment apparatus which concerns on embodiment of this invention. It is an exploded perspective view of the waste liquid treatment apparatus. It is a schematic diagram which shows the state before assembling a tray and a sponge filter. It is a schematic diagram which shows the state after assembling a tray and a sponge filter. It is a schematic diagram which shows the 1st process of the waste liquid treatment performed by the waste liquid treatment apparatus. It is a schematic diagram which shows the state which the 1st process of the waste liquid treatment performed by a waste liquid treatment apparatus is completed. It is a schematic diagram which shows the 2nd process of the waste liquid treatment performed by the waste liquid treatment apparatus. It is a schematic diagram of the multilayer filter which concerns on the modification of this invention.

[Overall configuration of waste liquid treatment device 101]
FIG. 1 is an external perspective view showing a waste liquid treatment device 101 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the waste liquid treatment device 101.
The waste liquid treatment device 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 can be used. In the experimental environment, a drum with an inner diameter of 567 mm and an inner height of 830 mm was used.
As the multilayer filter 103, one in which a large number of 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. Since the uppermost tray 201 is provided to hold the sponge filter 202, 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 down the sponge filter 202 is used.

The waste liquid treatment device 101 operates as follows.
First, the waste liquid pump 105 is operated, the waste liquid 106 stored in the waste liquid storage tank 102 is pumped up, and the waste liquid 106 is poured into the multilayer filter 103 from the uppermost layer of the multilayer filter 103. Then, the waste liquid 106 soaks into 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 from the bottom layer of the multilayer filter 103, and the air passes through the sponge filter 202 in the multilayer filter 103 and is discharged by the intake fan 104. In the process, the air contains the water content of the waste liquid 106, so that the sponge filter 202 gradually dries over time.
The waste liquid treatment device 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 to release the water in the waste liquid 106 to the atmosphere as water vapor and concentrate the waste liquid 106. Will be possible.

FIG. 3 is a cross-sectional view showing a state before stacking the tray 201 in which the sponge filter 202 is laid on the bottom plate 201a.
FIG. 4 is a cross-sectional view showing a state after stacking trays 201 in which the sponge filter 202 is laid on the bottom plate 201a.
As shown in FIGS. 3 and 4, the side wall 201b of the tray 201 is inclined in a substantially tapered shape, and by stacking the trays 201 as shown in FIG. 4, a space D401 is formed between the bottom plates 201a of the trays 201 to be overlapped with each other. Will be done. The sponge filter 202 is sandwiched in this space D401.

As described above, since the tray 201 supports the sponge filter 202, it is an essential condition that the bottom plate 201a has a porous shape and that the side wall 201b has no holes in order to prevent air leakage. In the experimental environment, a polypropylene seedling raising box 51 type (505 mm × 360 mm × 107 mm) manufactured by Appleware Co., Ltd. was used. Since the four corners of the tray 201 used in the experimental environment fit into the inner diameter of the drum can, which is the waste liquid storage tank 102, the tray 201 is used by fitting it into the drum can as it is, but the size of the tray 201 does not match. It may be necessary to provide a support frame for the multilayer filter 103 with a veneer board, lumber, or the like as appropriate.

Further, in order to allow the sponge to pass through 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, it is an important check item whether or not the space D401 formed when the trays 201 are stacked is secured to such an 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 treatment or the like, and for example, a general urethane sponge, a melamine sponge, or the like can be used. In order for the waste liquid 106 to soak in and allow air flow, it is an essential condition that the waste liquid 106 is an open cell type having air permeability and water permeability. The closed cell type sponge manufactured and sold for shock absorption and the like cannot be used as a sponge filter 202 because it does not allow air or water to pass through.
If the size of the bubbles formed in the sponge used for the sponge filter 202 is too fine, it becomes difficult for the waste liquid 106 to permeate and the air flow also deteriorates. On the contrary, if it is too large, the holding capacity of the waste liquid 106 is lowered. Therefore, sponges manufactured and sold for the purpose of permeating air and water are preferable.
Further, it is desirable that the size of the sponge filter 202 has a shape that covers the entire surface of the bottom plate 201a of the tray 201 in order to effectively receive the air flow described later.

The description will be continued with reference to FIGS. 1 and 2 again.
The intake fan 104 is a blower / exhaust fan for general business use. In the experimental environment, SJF-300RS of Suiden Co., Ltd. was used. If the intake capacity or work amount of the intake fan 104 is too weak, the water content 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 blown away. There is. Therefore, a stronger intake capacity is required so as not to suck up and fly the waste liquid 106. This 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 in order to limit the intake capacity of the intake fan 104.
Further, since the intake fan 104 alone cannot be fixed to the tray 201, a fixing plate 107 for fixing the intake fan 104 is formed by a veneer plate or the like. The fixing plate 107 is necessary for fixing the intake fan 104 and concentrating the air flow of the intake fan 104 on the multilayer filter 103.

The discharge hose 108 of the waste liquid pump 105 is connected to the fixed plate 107, and the waste liquid 106 pumped up by the waste liquid pump 105 from the waste liquid storage tank 102 through the suction hose 109 is the most of the multilayer filter 103 on which the fixed plate 107 is installed. It is input from the upper layer.
The waste liquid pump 105 may have the ability to suck up the waste liquid 106 from the waste liquid storage tank 102 to the uppermost layer of the multilayer filter 103, but due to the situation of transporting the waste liquid 106, it is difficult to cause clogging by dust in the waste liquid 106 if possible. The one is preferable.

The power cords of the intake fan 104 and the waste liquid pump 105 are connected to the timer switch 110. The timer switch 110 exclusively connects the AC power supply 111 and the waste liquid pump 105 or the intake fan 104. The timer switch 110 connects the AC power supply 111 and the waste liquid pump 105 for 1 minute, then disconnects the waste liquid pump 105 from the AC power supply 111, and connects the AC power supply 111 and the intake fan 104 for 1 hour. This operation is repeated.

FIG. 5 is a schematic view showing a first step of waste liquid treatment executed by the waste liquid treatment apparatus 101.
FIG. 6 is a schematic view showing a state in which the first step of the waste liquid treatment executed by the waste liquid treatment device 101 is completed.
FIG. 7 is a schematic view showing a second step of waste liquid treatment executed by the waste liquid treatment apparatus 101.

First, as shown in FIGS. 1 and 5, the timer switch 110 connects the AC power supply 111 to the waste liquid pump 105, so that the waste liquid pump 105 operates for 1 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 is poured from the uppermost layer of the multilayer filter 103 into the multilayer filter 103 through the discharge hose 108. As a result, as shown in FIG. 6, the waste liquid 106 soaks into the sponge filter 202 in the multilayer filter 103. In FIG. 6, the sponge filter 202 is shaded to show a state in which the waste liquid 106 has soaked into the sponge filter 202.
The excess waste liquid 106 that cannot completely soak into the sponge filter 202 leaks from the hole formed in the bottom plate 201a of the tray 201 located at the bottom layer of the multilayer filter 103, and returns to the waste liquid storage tank 102 again.

Next, as shown in FIG. 7, the timer switch 110 disconnects the waste liquid pump 105 from the AC power supply 111, so that the waste liquid pump 105 is stopped. Then, the timer switch 110 connects the AC power supply 111 to the intake fan 104 to operate the intake fan 104 for, for example, one hour, and the motor 501 of the intake fan 104 rotates and drives the propeller 502. Then, air is sucked from the bottom layer of the multilayer filter 103, and the air passes through the sponge filter 202 in the multilayer filter 103 and is discharged by the intake fan 104 to form an air flow R701. In the process, the air passing through the sponge filter 202 contains the water content of the waste liquid 106, so that the sponge filter 202 gradually dries with the passage of time.

[Experimental results of waste liquid treatment device 101]
From this, the experimental result of the waste liquid treatment apparatus 101 is described.
In all the operation settings of the waste liquid treatment device 101 except for the experiment of changing the drying operation time, the waste liquid 106 is supplied by the waste liquid pump 105 for 1 minute, the drying operation by the intake fan 104 is performed for 1 hour, and the waste liquid 106 supply and the drying operation are repeated. Was carried out for 50 hours.
<1> Number of tray 201 and sponge filter 202 layers and processing capacity The number of trays 201 stacked was changed to 10, 20 and 30 stages, and the waste liquid concentration processing capacity in each case was measured. In the measurement, the liquid level of the waste liquid 106 stored in the waste liquid storage tank 102 at the start of the experiment is subtracted from the liquid level of the waste liquid 106 remaining in the waste liquid storage tank 102 at the end of the experiment, and the waste liquid storage tank 102 is measured. The volume of water evaporated from the waste liquid 106 was calculated based on the inner diameter of the waste liquid 106.
10 trays: about 11.4 liters 20 trays: about 16.4 liters 30 trays: about 22.7 liters From the above experimental results, it can be judged that the 30 trays have the highest water evaporation treatment capacity.
If the number of trays exceeds 30 stages, the structure of the waste liquid treatment device 101 becomes unstable unless a turret, a frame, or the like for supporting the multilayer filter 103 is constructed due to the structure of the multilayer filter 103. It 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 processing 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 judged that the water evaporation treatment capacity is highest when the drying operation time is set to 1 hour. can.
Depending on the weather, if the drying operation time is set to a time shorter than 1 hour, for example, about 30 minutes, it is possible that the waste liquid concentration treatment can be further advanced.

<3> Presence / absence of inter-story gap The waste liquid concentration processing capacity in each case was measured between the tray 201 constituting the multilayer filter 103 with a 10 mm spacer inserted and the tray without a spacer inserted.
Without spacer: Approximately 22.7 liters With spacer: Approximately 20.2 liters From the experimental results of about 20.2 liters or more, it can be judged that the water evaporation treatment capacity is high when the spacer is not inserted.

<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 processing capacity in each case was measured.
400 mm x 200 mm: Approximately 22.7 liters 200 mm x 200 mm: Approximately 17.7 liters From the above experimental results, it is better to cover the entire surface of the bottom plate 201a of the tray 201 with a large area to cover the water evaporation treatment capacity. Can be judged to be high.

<5> Types of sponge filter 202 One 400 mm x 200 mm urethane sponge, two 400 mm x 200 mm urethane sponges, one 400 mm x 200 mm melamine sponge, and two 400 mm x 200 mm melamine sponges. The waste liquid concentration treatment capacity in each case was measured by stacking the sheets.
1 urethane sponge: Approximately 22.7 liters 2 layers of urethane sponge: Approximately 10.1 liters 1 melamine sponge: Approximately 30.3 liters 2 layers of melamine sponge: Approximately 15.2 liters Based on the experimental results above, the sponge filter If one melamine sponge is used for 202, it can be judged that the water evaporation treatment capacity is the highest.
However, since the price of melamine sponge is double that of urethane sponge, it can be judged that one urethane sponge is the best option in consideration of cost effectiveness.

The waste liquid treatment device 101 described above evaporates the water content of the waste liquid 106 and concentrates the waste liquid 106. Since the water evaporates, it is not necessary to flow the waste liquid 106 into the sewer. Since the waste liquid 106 originally to be treated is a treated waste liquid generated by the treatment described in Patent Documents 1, 2, 3 or 4, pollutant components, dust and the like are immediately contained in the waste liquid storage tank even after the concentration treatment. It does not stay in 102. If the pollutant components and dust are retained to the extent that they can be visually recognized by repeating the treatment to some extent, the pollutant components and dust can be mixed with the polymer wax treatment waste liquid by the method described in Patent Document 3. It becomes possible to solidify with.

Although it is possible to treat the waste liquid 106 to be treated in Patent Documents 1, 2, 3 or 4 by the waste liquid treatment apparatus 101 according to the embodiment of the present invention without treatment, it is not recommended.
In the case of the polymer wax treatment waste liquid to be treated in Patent Documents 1 and 2, since it is alkaline containing caustic soda, the urethane sponge may be deteriorated at an early stage, especially when the urethane sponge is used for the sponge filter 202. .. However, on the premise that the urethane sponge is disposable instead of the filter, the treatment may be intentionally 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.
Further, in the case of the waste liquid containing the oil and fat component to be treated in Patent Document 3 and the waste liquid containing fine dust such as carbon powder which is the treatment target in Patent Document 4, the oil and fat component and dust are visible on the sponge filter 202. This also deteriorates prematurely as it causes clogging.
That is, since the concentration treatment of the untreated waste liquid causes early deterioration of the sponge filter 202, it is decided whether or not to carry out the treatment 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-described embodiment, the multilayer filter 103 is composed of the tray 201 made of synthetic resin, but it 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 that allow air and waste liquid 106 to pass through, and a bottom plate 201a that supports the bottom plate 201a without pressing the sponge filter 202 laid on the bottom plate 201a more than necessary, and also has an intake fan. Any structure may be used as long as it has a side wall 201b that blocks the leakage of the air flow formed by the structure.
For example, even if a frame is made of wood or the like and a wire mesh is fitted, the same function as the tray 201 can be realized. However, in consideration of availability, convenience, light weight, good air blocking performance of the side wall 201b, etc., the tray 201 made of synthetic resin shows very good performance except for those specially designed.

Alternatively, as shown in FIG. 8, a door 803 is provided on the side wall of a square pillar-shaped housing 802 that is hollow and the top plate and bottom plate are omitted, and the wire mesh 804 and the sponge filter 202 are alternately provided from the door 803. The multilayer filter 801 can also be configured by inserting the laminated ones. 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. Although the tray 201 is an effective option as a component of the multilayer filter 103, it is not essential.
That is, the multilayer filter 103 is a structure capable of stacking and storing a plurality of sponge filters 202 by having a plurality of bottom plates 201a, and has a plurality of holes capable of supporting the sponge filter 202 and allowing air and waste liquid 106 to pass through. The bottom plate 201a having the bottom plate 201a and the side wall 201b for blocking the leakage of the air flow formed by the intake fan are indispensable configurations. The side wall 201b is formed so as 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 treated in Patent Documents 1, 2, 3 or 4 can be treated by the waste liquid treatment device 101 according to the embodiment of the present invention without being treated. At that time, in order to prevent deterioration due to clogging of the uppermost sponge filter 202 mixed in the waste liquid 106, a non-woven fabric is laid on the sponge filter 202, and pollutant components and dust contained in the waste liquid 106 are laid. Etc. may be removed with a non-woven fabric.

(3) The waste liquid treatment apparatus 101 according to the embodiment of the present invention aims to evaporate water from the waste liquid 106. In order to efficiently evaporate the water from the waste liquid 106, the wider 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, the higher the concentration efficiency of the waste liquid 106. 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 to match the inner diameter of the drum can, which is the waste liquid storage tank 102, but this is for the convenience of combining commercially available products to easily and quickly realize the apparatus. Only such a selection was made. 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. Will be possible.

(4) In order to efficiently evaporate the 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 device 101 is installed by heating, it can be expected that the waste liquid concentration treatment will proceed more efficiently. Especially in rainy weather, the humidity is high, so it is effective to use heating to reduce the humidity. If the room is large, a simple constant temperature bath for accommodating the waste liquid treatment device 101 may be constructed. Further, even if the waste liquid 106 itself is heated with a heater or the like, a similar effect can be expected.

(5) In the waste liquid treatment device 101 according to the embodiment of the present invention, the timer switch 110 operates the waste liquid pump 105 and the intake fan 104 exclusively, but it does not necessarily have to be exclusive. The waste liquid pump 105 and the intake fan 104 may be operated at the same time as long as the power supply amount of the power supply is not exceeded.

(6) In the above experiment, the timer switch 110 operates the waste liquid pump 105 for 1 minute and the intake fan 104 for 1 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 port or the exhaust port of the intake fan 104 to connect the humidity sensor to the microcomputer. Then, the microcomputer measures the humidity of the air flow that has passed through the multilayer filter 103. When it is detected that the humidity of the air flow has decreased by a predetermined ratio immediately after the waste liquid pump 105 is stopped, the microcomputer program can be configured to operate the waste liquid pump 105 again.

In the embodiment of the present invention, the waste liquid treatment device 101 is disclosed.
The waste liquid 106 pumped up from the waste liquid storage tank 102 by the waste liquid pump 105 is charged from the uppermost layer of the multilayer filter 103, and the waste liquid 106 soaks into the sponge filter 202 in the multilayer filter 103. Next, the intake fan 104 is operated. Then, air is sucked from the bottom layer of the multilayer filter 103, and the air passes through the sponge filter 202 in the multilayer filter 103 and is discharged by the intake fan 104. In the process, the air contains the water content of the waste liquid 106, so that the sponge filter 202 gradually dries over time.
By assembling the sponge filter 202 soaked with the waste liquid 106 into a multi-layer structure and forcibly drying the sponge filter 202 with the intake fan 104, a high-efficiency waste liquid treatment device 101 can be constructed at low cost by combining low-priced articles. be able to.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and other modifications and applications are provided as long as they do not deviate from the gist of the present invention described in the claims. including.

101 ... Waste liquid treatment device, 102 ... Waste liquid storage tank, 103 ... Multilayer filter, 104 ... Intake fan, 105 ... Waste liquid pump, 106 ... Waste liquid, 107 ... Fixed 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 made of a sponge with open cells,
A multi-layer filter that stacks and stores multiple sponge filters,
The intake fan provided on the top layer of the multilayer filter and
A waste liquid storage tank arranged at the bottom layer of the multilayer filter,
A waste liquid pump for pumping up the waste liquid stored in the waste liquid storage tank and pouring the waste liquid from the uppermost layer of the multilayer filter into the multilayer filter is provided.
The multilayer filter is
A bottom plate that supports the sponge filter and has a plurality of holes that allow air and the waste liquid to pass through.
It has a side wall that supports the bottom plate and blocks the leakage of airflow formed by the intake fan.
It is a structure capable of stacking and storing a plurality of the sponge filters by having a plurality of the bottom plates.
Waste liquid treatment equipment. The multilayer filter is configured by laminating a tray having the bottom plate and the side wall.
The waste liquid treatment apparatus according to claim 1.

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