JP4875922B2 - Wash water recycling device - Google Patents

Description

  The present invention relates to a washing water recycling apparatus, and more particularly to a washing apparatus for construction machines such as a power shovel and a bulldozer, and a washing water recycling apparatus applied to a car wash machine installed in a gas station.

Conventionally, a cleaning device for cleaning a construction machine such as a power shovel or a bulldozer is known (see, for example, Patent Document 1). In a construction machine cleaning apparatus such as Patent Document 1, a cleaning water injection unit that is positioned on the left and right of a crawler of the construction machine and mainly cleans the crawler, and a plunger for pumping high-pressure cleaning water to the cleaning water injection unit And a high-pressure washing water generation unit having a pump such as a pump.
JP-A-8-103736

  In the conventional cleaning apparatus such as Patent Document 1 described above, a large amount of cleaning water is required every time the construction machine is cleaned once. In addition, the cleaning water used is water stored in water storage tanks such as waterworks, and water is replenished to the storage tank every time cleaning work is performed. The cost of water supply at the establishment with the equipment was a factor. The washing water is mixed with sand, mud, pebbles, etc. adhering to the construction machine after washing the construction machine to become muddy water, but this mud is immediately discarded without being reused after washing. Water resources were wasted.

In its This, the present invention is, while maintaining the life of the cleaning device long, and an object thereof is to provide a cleaning water recycling unit that Ru can be prevented waste of water resources.

In order to achieve the above object, a washing water recycling apparatus according to the present invention includes an inlet filter that filters muddy water after washing of a construction machine, and a primary filtration that precipitates and separates sand contained in the muddy water that has passed through the inlet filter. A tank, an outlet filter provided at the outlet of the primary filtration tank and having a finer filtration accuracy than the inlet filter, and a fine filter having a finer filtration accuracy than the outlet filter while filtering muddy water that has passed through the outlet filter , A secondary filtration tank that precipitates and separates mud contained in the muddy water that has passed through the fine filtration filter to generate washing water for the construction machine, and the washing water is sent from the outlet to the water storage tank, The fine filtration filter has a recovery mechanism that recovers the filtration function by removing the residue accumulated in the reverse flow.
Moreover, the said filtration primary tank and the said filtration secondary tank have an inflow stirring prevention inclination board.

The fine filtration filter has a filter case and a filter body housed in the filter case, and the recovery mechanism makes the filter body in a compressed state and narrows the eyes during the filtration operation. At the same time, when the filter function is restored, the filter main body is opened from the compressed state and the eyes are enlarged to form a residue removal gap.
Also, between the outlet filter and the fine filtration filter, the residue can be removed coarse filtration filter that accumulates on the inside by flushing means is interposed, the inlet filter, the outlet filter, the coarse filtration filter, order filtering accuracy of the fine filtration filter that is set to be finer.

The present invention has the following remarkable effects.
The washing water recycling apparatus according to the present invention can prevent waste of water resources, and can greatly reduce the cost of water supply for establishments equipped with the washing apparatus for construction machines. Furthermore, it is possible to suppress the occurrence of abnormal wear or the like in the cleaning device of the construction machine, and it is possible to keep the life of the cleaning device long while reusing the muddy water after cleaning.
Moreover, it can be set as the washing water recycle apparatus which can be used for a long period of time, without a filtration function falling.
Moreover, the precipitation separation effect | action of a filtration primary tank and a filtration secondary tank can be improved.
In addition, the filtration function can be easily recovered with a compact and simple configuration.
Further, Ru can be performed smoothly and reliably filtered.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 through 4 Te at, described washing water recycling system according to the implementation of the embodiment of the present invention. Wash water recycling according to implementation embodiments device is applied to, for example, cleaning device for cleaning the construction machine 30 such as a power shovel and bulldozer. The construction machine cleaning apparatus shown in FIG. 1 has cleaning water injection units 44, 44 for mainly cleaning the crawlers 46, 46 of the construction machine 30, and pumps high-pressure cleaning water to the cleaning water injection units 44, 44. A high-pressure washing water generating unit 52 having a pressure-feed pump 53 and bases 47 and 47 on which the construction machine 30 is placed. The cleaning water jet units 44 and 44 can be cleaned while being moved along the crawlers 46 and 46.

The wash water recycling apparatus according to implementation embodiments, the separating tank 16 provided below the base 47, 47 of the above-described cleaning apparatus, the inlet filter 1 for filtering the mud after washing a construction machine 30, the inlet filter 1 A filtration primary tank 2 that precipitates and separates sand contained in the muddy water that has passed through; an outlet filter 9 provided at the outlet of the filtration primary tank 2; a fine filtration filter 5 that removes sand from the muddy water that has passed through the outlet filter 9; And a secondary filtration tank 3 that precipitates and separates mud contained in the muddy water that has passed through the fine filtration filter 5 to generate washing water for the construction machine 30 and that is fed from the outlet to the water storage tank 13. .

The separation tank 16 collects muddy water formed by mixing sand, mud, pebbles, etc. adhering to the construction machine 30 after washing the construction machine 30 and separating large pebbles and sand contained in the muddy water. And remove.
In the separation tank 16, a first water supply pump 35 for supplying muddy water to the filtration primary tank 2 through the flow path a is disposed. The first water pump 35 is disposed, for example, at a position approximately 40 cm to 50 cm below the reference water level of the muddy water stored in the separation tank 16. The first water pump 35 is disposed in the outlet filter 20 having a perforated container shape. The outlet filter 20 can filter the muddy water exiting the separation tank 16. The outlet filter 20 is set to a filtration accuracy capable of removing sand having a particle size of about 650 μm.

The filtration primary tank 2 has a box shape and is installed near the outside of the separation tank 16. A suspension hook 48 is provided on the upper surface of the filtration primary tank 2 so that it can be easily moved and installed.
The upper end of the filtration primary tank 2 is connected to the end of the flow path a. An inlet filter 1 is disposed on the inner side of the primary filtration tank 2 near the inlet. The inlet filter 1 is formed in the shape of a metal perforated container, and is set to a filtration accuracy capable of removing sand having a particle size of about 450 μm. The inlet filter 1 filters the muddy water sent from the separation tank 16 and then discharges the muddy water after filtration to the lower side of the primary filtration tank 2.

Moreover, the filtration primary tank 2 has a plurality of inflow and stirring preventing inclined plates 12. The inflow stirring preventing inclined plates 12 have an inclination angle of about 60 degrees in a side view. Thereby, the muddy water discharged downward from the inlet filter 1 is guided into the water from above the water surface.
An outlet filter 9 is disposed in the vicinity of the upper outlet on the inner side of the filtration primary tank 2. The outlet filter 9 is formed in the shape of a metal perforated container, and is set to a filtration accuracy capable of removing sand having a particle size of about 230 μm. In the outlet filter 9, the 2nd water supply pump 37 for supplying muddy water to the fine filtration filter 5 side by the flow path b is arrange | positioned. The second water pump 37 is disposed, for example, at a position of about 40 cm to 50 cm below the reference water surface of the muddy water stored in the filtration primary tank 2.

The filtration primary tank 2 is provided with an oil removing device 31 for collecting oil floating on the muddy water accumulated in the filtration primary tank 2. The oil collected by the oil removing device 31 is stored in the collecting tank 32.
A liquid level sensor 39 is attached to the filtration primary tank 2. The amount of muddy water accumulated in the filtration primary tank 2 is detected by the detection signal of the liquid level sensor 39, and the drive control of the first water pump 35 is performed according to the amount.

Normally, the muddy water from the separation tank 16 is sent to the primary filtration tank 2, but it is preferable to install an additional filtration tank 19 when more reliable filtration is desired. In this case, the additional filtration tank 19 is installed next to the filtration primary tank 2 and is connected to the separation tank 16 and the filtration primary tank 2 through flow paths c and d (shown by two-dot chain lines).
In this case, a metal perforated container-like inlet filter 21 is disposed in the vicinity of the upper inlet on the inner side of the additional filtration tank 19, and the muddy water from the separation tank 16 is filtered by the inlet filter 21. Muddy water is stored in the additional filtration tank 19. Further, an outlet filter 22 is disposed in the vicinity of the upper outlet in the extension filtration tank 19. Further, an extension water pump 36 is provided in the outlet filter 22, and the muddy water filtered in the extension filtration tank 19 is sent to the primary filtration tank 2 through the channel d by the extension water pump 36. Configure as follows. A liquid level sensor 38 is attached to the additional filtration tank 19. Then, the amount of muddy water stored in the additional filtration tank 19 is detected by the detection signal of the liquid level sensor 38, and the drive control of the first water pump 35 is performed according to the amount.

Next, a flow path for supplying muddy water to the fine filtration filter 5 by the second water pump 37 at the outlet of the filtration primary tank 2 (returning from the story of the additional filtration tank 19 to the story of the filtration primary tank 2). One end of b is connected. In the middle of the flow path b, a coarse filtration filter 10 capable of removing residues accumulated inside by the flushing means 11 is interposed (that is, between the outlet filter 9 and the fine filtration filter 5). The coarse filtration filter 10 is interposed).
The flushing means 11 is connected to the lower end of the coarse filtration filter 10 and communicates with the drain port 49, and is disposed in the middle of the flushing flow path e and remains inside the coarse filtration filter 10. And a flushing valve 24 that is opened when removing an object.
Further, a recovery first switching valve 25 is interposed in the middle of the flow path b and between the coarse filter 10 and the fine filter 5.

Next, the fine filtration filter 5 will be described in detail. As shown in FIGS. 3 and 4, the fine filtration filter 5 includes a filter case 14 and a filter main body 15 accommodated in the filter case 14.
The filter body 15 has a plurality of leaf spring members 7 and filtration members 8 that are alternately stacked. The leaf spring member 7 is made of, for example, metal and has a corrugated ring shape (not shown). The filtering member 8 is made of metal, for example, and has a plate ring shape (not shown) having shallow groove portions formed at a central angle and the like.

Here, the fine filtration filter 5 implementation form, has a recovery mechanism 4 to restore filtering function to remove residue accumulated therein in reverse flow. The recovery mechanism 4 makes the filter body 15 in a compressed state fine during filtration operation, and opens the filter body 15 from the compressed state to enlarge the residue when recovering the filtration function. The removal gap S is formed.
More specifically, as shown in FIGS. 2 to 4, the recovery mechanism 4 includes a switching cylinder 6 that can be switched between a filtration operation and a recovery of the filtration function, and a fine filtration of the flow path b. A check valve 45 interposed between the filter 5 and the coarse filtration filter 10 and downstream of the first switching valve 25 for recovery, and a flow path connecting the outlet side of the fine filtration filter 5 and the filtration secondary tank 3 a reserve tank 18 provided in the middle of h, a recovery second switching valve 26 provided in the middle of the flow path h and downstream of the reserve tank 18, and a reserve tank 18 in the flow path i. And a compressor 17 capable of supplying air via a compressor communication valve 28 in the middle of the flow path i. Reference numeral 23 denotes a regulator.
The compressor 17 not only supplies air to the reserve tank 18, but also supplies air to the switching cylinder 6 via the cylinder switching valve 29.

The switching cylinder 6 is attached to the upper side of the filter case 14, and the piston rod 6 a can move up and down inside the filter case 14 by switching the cylinder switching valve 29. The piston rod 6a is inserted through the filter body 15. That is, the piston rod 6a is inserted into the holes of the plurality of corrugated ring-shaped plate spring members 7 and the holes of the plurality of plate-ring-shaped filtering members 8.
A support member 50 is attached to the tip of the piston rod 6a. The support member 50 sandwiches the filter main body 15 between the inner surface of the filter case 14.

The piston rod 6a is raised during the filtration operation. Thereby, the filter main body 15 is compressed between the support member 50 and the inner surface of the filter case 14 during the filtration operation. In the compressed state, the plurality of leaf spring members 7 of the filter body 15 are compressed in the axial direction of the piston rod 6a and elastically deformed into a substantially flat ring shape. In this state, the muddy water is filtered through the shallow groove portion of the filtering member 8. The implementation form, the particle size is set to a removable filtering accuracy sand of about 5 [mu] m. In this way, the recovery mechanism 4 is configured.
Connected to the lower end of the fine filtration filter 5 is a residue discharge channel g that joins the flushing channel e and leads to the drain port 49. In the middle of the residue discharge channel g, a residue discharge valve 27 is interposed.

  Rough filtration filter 10, flushing means 11, first switching valve 25 for recovery, check valve 45, fine filtration filter 5, residue discharge valve 27, compressor 17, regulator 23, cylinder switching valve 29, compressor communication valve 28, the reserve tank 18, and the recovery second switching valve 26 are all housed in an outer box-shaped filter unit U attached to the front surface of the filtration primary tank 2.

Next, the filtration secondary tank 3 connected to the outlet side of the fine filtration filter 5 through the flow path h is box-like, like the filtration primary tank 2, and is installed in the vicinity of the outside of the separation tank 16. . A suspension hook 48 is provided on the upper outer surface of the filtration secondary tank 3 so that it can be easily moved and installed.
The muddy water that has been filtered by the fine filter 5 and passed through the reserve tank 18 and the recovery second switching valve 26 flows into the filtration secondary tank 3 from the upper inlet. This filtration secondary tank 3 has inflow stirring preventing inclined plates 12... Like the filtration primary tank 2. The inflow stirring preventing inclined plates 12 have an inclination angle of about 60 degrees in a side view. Thereby, muddy water is led into the water from above the water surface.

In addition, ozone deodorizer and hypochlorous acid-based chemicals can be introduced into the filtration secondary tank 3 from the chemical tank 33 housed in the filter unit U through the chemical supply channel f by driving the chemical supply pump 34. It is said that. Thereby, it is possible to sterilize the filtration secondary tank 3.
The filtration secondary tank 3 is connected to a flow path j through which water can be supplied from a water supply source 51 such as a water supply.
An upper liquid level sensor 40 and a lower liquid level sensor 41 are attached to the filtration secondary tank 3. The upper liquid level sensor 40 and the lower liquid level sensor 41 detect whether the liquid level of the filtration secondary tank 3 is within a predetermined range. For example, when it is detected that the liquid level of the filtration secondary tank 3 is lower than a predetermined range, water is supplied from the water supply source 51.

A washing water supply channel k for supplying washing water to the water storage tank 13 is connected to the upper outlet of the filtration secondary tank 3, and the washing water interposed in the middle of the washing water supply channel k. The supply pump 42 is driven to supply cleaning water from the filtration secondary tank 3 to the water storage tank 13.
The water storage tank 13 is installed near the outside of the separation tank 16 and next to the filtration secondary tank 3. The water storage tank 13 is connected to the high-pressure washing water generation unit 52 through a flow path r. The water storage tank 13 supplies a sufficient amount of cleaning water (so as not to be deficient during the cleaning operation) to the high-pressure cleaning water generating unit 52.

Washing water recycling apparatus constructed according to the implementation embodiments as described above, the inlet filter 1 and the outlet filter 9 arranged inside the filtration primary tank 2, coarse filtration filter 10 and fine filtration filter of the filter unit U The filtration accuracy with 5 is summarized as follows in order. That is, the order is the inlet filter 1 (filtration accuracy 450 μm), the outlet filter 9 (filtration accuracy 230 μm), the coarse filtration filter 10 (filtration accuracy 100 μm), and the fine filtration filter 5 (filtration accuracy 5 μm). Thus, the filtration accuracy is set to become finer as it goes downstream.

Next, with reference to FIG. 2 to FIG. 4, an operation for restoring the filtration function of the coarse filtration filter 10 and the fine filtration filter 5 for the device housed in the filter unit U will be described.
First, the drive of the 2nd water pump 37 is stopped from the state (state of FIG. 3) which is performing filtration operation. Then, the first recovery switching valve 25 and the second recovery switching valve 26 in the open state are closed, and the flushing valve 24 in the closed state is opened. Then, the coarse filter 10 is flushed with the residual pressure of the muddy water that has been fed by the second water pump 37. The residue accumulated in the coarse filter 10 is discharged from the discharge port 49 through the flushing flow path e. The time during which this flushing is performed is about 2 seconds (short because it is performed by the residual pressure of muddy water).

Next, the piston rod 6a of the switching cylinder 6 is lowered by switching the cylinder switching valve 29, and the filter main body 15 of the fine filtration filter 5 is released from the compressed state. Then, the shape of the leaf spring member 7 of the filter body 15 that has been elastically deformed into a substantially flat ring shape during the filtration operation is restored to the corrugated ring shape. Then, the eyes of the filter main body 15 are enlarged, and the residue removal gaps S are formed. At the same time as the piston rod 6a of the switching cylinder 6 is lowered, the compressor communication valve 28 and the residue discharge valve 27 are opened.
Then, as shown in FIG. 4, the air from the compressor 17 enters the fine filtration filter 5 from the flow path h side together with the muddy water accumulated in the reserve tank 18 and exits from the inside of the filter body 15 to the outside of the filter body 15. Then, the residue that was clogged during the filtration operation goes out from the discharge port 49 through the residue discharge flow path g. This filtration function recovery operation is performed for about 10 seconds.

When the above 10-second filtration function recovery work is completed, the compressor communication valve 28 and the residue discharge valve 27 are closed, and the piston rod 6a of the switching cylinder 6 is raised by the cylinder switching valve 29 to compress the filter body 15 And Further, the flushing valve 24 is closed, and the first recovery switching valve 25 and the second recovery switching valve 26 in the closed state are opened. Then, the driving of the second water pump 37 is resumed. Then, it becomes the flow of the filtration operation shown in FIG.
The operation of the device housed in the filter unit U described above is fully automatic under the control of a control means (not shown), and the coarse filtration filter 10 and the fine filtration filter 5 are set at regular intervals (for example, at intervals of 60 seconds). cleaning Ru is carried out.

Contact name present invention is not limited to the embodiments described above, it is possible design changes without departing from the scope of the present invention. For example, in the implementation form, to a number of fine filtration filter 5 having a recovery mechanism 4 it may be two or more, may not the coarse filtration filter 10 is provided.
Further, the fine filter 5, the compressor 17, and the coarse filter 10 are not limited to those stored in one filter unit U, but may be stored in separate units.
Moreover, you may attach the residual water discharge apparatus which discharges the muddy water and washing water which remain | survived in piping. According to this structure, when using the washing water recycling system according to the present invention in a cold region, mud, washing water Ru prevents problems washing water recycling apparatus frozen in the pipe unusable.

  As described above, the washing water recycling apparatus according to the present invention includes the inlet filter 1 that filters the muddy water after the construction machine 30 is washed, and the filtration primary tank 2 that precipitates and separates sand contained in the muddy water that has passed through the inlet filter 1. And an outlet filter 9 provided at the outlet of the filtration primary tank 2; a fine filtration filter 5 that removes sand from the mud that has passed through the outlet filter 9; and mud contained in the mud that has passed through the fine filtration filter 5 And a secondary filtration tank 3 for generating washing water for the construction machine 30 and for sending the washing water from the outlet to the water storage tank 13, and the fine filtration filter 5 is a residue accumulated in the reverse flow. Therefore, the muddy water after washing the construction machine 30 can be reused as washing water from which contaminants such as sand and mud are removed. As a result, waste of water resources can be prevented, and water costs for establishments equipped with the cleaning device for the construction machine 30 can be greatly reduced. Further, sand, mud, etc. are mixed into the high pressure washing water generating unit 52 of the washing device of the construction machine 30 by the inlet filter 1, the filtration primary tank 2, the outlet filter 9, the fine filtration filter 5, and the filtration secondary tank 3. Can be prevented, and the occurrence of abnormal wear or the like in the cleaning device of the construction machine 30 can be suppressed. Specifically, problems such as abnormal wear of the components of the pressure pump 53 of the high pressure washing water generation unit 52 can be eliminated. Therefore, the lifetime of the cleaning device can be kept long while reusing the muddy water after cleaning.

  Further, among the plurality of filters, the fine filtration filter 5 having a fine filtration accuracy is likely to be clogged, so that the filtration function decreases as the filtration operation is continued. However, in the present invention, the fine filtration filter 5 has the recovery mechanism 4 that recovers the filtration function by removing the residue accumulated in the reverse flow, so that the fine filtration filter 5 is periodically cleaned. And clogging can be eliminated. Thereby, it can be set as the washing water recycle apparatus which can be used for a long time, without a filtration function falling.

  Moreover, since the filtration primary tank 2 and the filtration secondary tank 3 have the inflow stirring prevention inclined plates 12..., The muddy water that has been fed is filtered through the inflow stirring prevention inclined plates 12. It is possible to guide from above the water surface in the secondary tank 3 to the inside. Thereby, the muddy water stored in the filtration primary tank 2 and the filtration secondary tank 3 is compared with the case where the muddy water sent is dropped directly on the water surface in the filtration primary tank 2 and the filtration secondary tank 3. Can be prevented from being stirred, so that the precipitation separation action of the filtration primary tank 2 and the filtration secondary tank 3 can be improved.

  Further, the fine filtration filter 5 has a filter case 14 and a filter body 15 that is housed in the filter case 14, and the recovery mechanism 4 keeps the filter body 15 in a compressed state during the filtration operation. When the filter function is restored, the filter main body 15 is released from the compressed state, and the eyes are enlarged to form the residue removal gap S. Therefore, the filter body 15 is compact and simple. The filtration function can be easily recovered while adopting the configuration. Daily inspection is also easy.

  In addition, since the filtration accuracy is set in the order of the inlet filter 1, the outlet filter 9, and the fine filtration filter 5, "the sand / mud contained in the mud already has a small particle size but its mud The filter can be smoothly and reliably filtered without passing through a filter having a rough filtration accuracy.

Further, between the outlet filter 9 and the fine filtration filter 5, a coarse filtration filter 10 capable of removing the residue accumulated inside by the flushing means 11 is interposed, and the inlet filter 1, the outlet filter 9, the coarse filtration filter Since the filter 10 and the fine filter 5 are set so that the filtration accuracy becomes finer in the order, “the sand / mud contained in the muddy water is already small, but the muddy water is turned into a filter with a coarse filtration accuracy. There is no waste of filter such as “pass through”, and filtration can be performed smoothly and reliably.
Further, the rough filtration filter 10 can be periodically cleaned by the flushing means 11 to eliminate clogging of the coarse filtration filter 10. Then, muddy water containing sand and mud having a particle diameter that can be easily filtered by the fine filtration filter 5 can be always sent to the fine filtration filter 5 that has finer filtration accuracy than the coarse filtration filter 10 and is likely to be clogged. . Thus, Ru can be performed more smoothly and reliably filtered.

Is a perspective view of applying the wash water recycling apparatus to the cleaning apparatus for a construction machine according to the implementation embodiments of the present invention. It is a schematic diagram showing a wash water recycling apparatus of implementation forms. It is a simplified sectional view showing a fine filtration filter and its periphery at the time of filtration operation. Ru simplified cross-sectional view showing a fine filtration filter and around the time of performing the recovery of the filtration function.

DESCRIPTION OF SYMBOLS 1 Inlet filter 2 Filtration primary tank 3 Filtration secondary tank 4 Recovery mechanism 5 Fine filtration filter 9 Outlet filter
10 Coarse filter
11 Flushing means
12 Inclined plate for preventing inflow stirring
13 Water tank
14 Filter case
15 Filter body
30 construction machinery S residue removal gap between

Claims (4)

An inlet filter (1) for filtering muddy water after washing of the construction machine (30), a filtration primary tank (2) for precipitating and separating sand contained in the muddy water passing through the inlet filter (1), and the filtration primary tank An outlet filter (9) provided at the outlet of (2) and having a finer filtration accuracy than the inlet filter (1), and the muddy water passing through the outlet filter (9) is filtered and more filtered than the outlet filter (9). The fine filtration filter (5) having a fine accuracy and the mud contained in the muddy water that has passed through the fine filtration filter (5) are separated by precipitation to generate washing water for the construction machine (30). A secondary filtration tank (3) fed to the water storage tank (13),
Furthermore, the said fine filtration filter (5) has a recovery mechanism (4) which removes the residue accumulated inside in the backflow and recovers a filtration function, The washing water recycling apparatus characterized by the above-mentioned.   The washing water recycling apparatus according to claim 1, wherein the primary filtration tank (2) and the secondary filtration tank (3) have an inflow stirring preventing inclined plate (12). The fine filtration filter (5) has a filter case (14) and a filter body (15) accommodated in the filter case (14).
The recovery mechanism (4) makes the filter body (15) in a compressed state fine during filtration operation, and closes the filter body (15) from the compressed state when recovering the filtration function. The washing water recycling apparatus according to claim 1 or 2, wherein the cleaning water recycling apparatus is configured to open and enlarge the eyes to form a residue removal gap (S). Between the outlet filter (9) and the fine filtration filter (5), a coarse filtration filter (10) capable of removing the residue accumulated inside by the flushing means (11) is interposed. The cleaning according to claim 1, 2 or 3 , wherein the filter (1), the outlet filter (9), the coarse filter (10), and the fine filter (5) are set so that the filtration accuracy becomes finer in this order. Water recycling equipment.

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