Effluent treatment apparatus

Abstract

To provide an effluent treatment apparatus capable of efficiently capturing and removing solid contained in effluent.SOLUTION: An apparatus includes a first storage tank 8 that receives and temporarily stores effluent, a solid-liquid separator 9 that separates slurry containing a solid settled in the first storage tank 8 into solid and liquid components, a second storage tank 11 that temporarily stores liquid components separated from slurry in the solid-liquid separator 9 and separates oil and solids remaining in the liquid components and then releases the liquid component to the outside, and an organic waste storage tank 10 that stores the solid component separated from the slurry in the solid-liquid separator 9.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wastewater treatment device that separates wastewater into a liquid component and a solid component. [Background technology]

[0002] It is known that garbage disposers are installed under the kitchen sink of an ordinary household. With a garbage disposer, kitchen waste generated in the kitchen is crushed and mixed with water to produce a mixture of small pieces of kitchen waste and water, i.e., a slurry, which can be discharged into the sewer. If a garbage disposer is installed in the kitchen, kitchen waste can be quickly discharged into the sewer every time it is generated, so the kitchen can be kept clean.

[0003] However, some local governments in Japan do not permit the direct discharge of slurry generated by disposers into public sewer systems, because it is feared that if the slurry is directly discharged into the public sewer system, it could clog sewer pipes or cause the retained material to rot, resulting in a foul odor and possibly interfering with sewage treatment. In these local governments, disposer wastewater treatment systems are required to be installed that separate and remove food waste from wastewater containing food waste crushed by the disposer and then discharge it into the sewer system.

[0004] Many inventions have already been applied for as patents for disposer wastewater treatment systems. For example, Patent Document 1 discloses a wastewater treatment device that includes a solid-liquid separation tank that separates solids contained in the inflowing wastewater by settling, a treatment tank that uses microorganisms to decompose organic components in the wastewater that flows out from the solid-liquid separation tank, a settling separation tank that separates sludge generated in the treatment tank by settling, and a solid-liquid separation device that separates the sludge containing the solids that have settled in the solid-liquid separation tank into a solid and a liquid. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-292387 A Summary of the Invention [Problem to be solved by the invention]

[0006] The sludge that settles in the settling tank of the wastewater treatment device described in Patent Document 1 is returned to the solid-liquid separation tank (paragraph 0020 of the specification and Figure 1). This sludge, together with the solids that settled in the solid-liquid separation tank, is transferred again to the solid-liquid separation device, where it is separated into solids and liquids. The solids are then discharged to a composting device, and the liquids are returned to the solid-liquid separation tank (paragraph 0021 of the specification and Figure 1).

[0007] However, the sludge particles that settle in the settling tank and are returned to the solid-liquid separation tank and then transferred to the solid-liquid separation device are originally particles suspended in the supernatant liquid of the wastewater retained in the solid-liquid separation tank, and have a small particle size. Therefore, most of the sludge particles slip through the mesh of the filter of the solid-liquid separation device and are returned to the solid-liquid separation tank together with the liquid. In the end, in the wastewater treatment device described in Patent Document 1, most of the sludge particles contained in the wastewater circulate between the solid-liquid separation tank and the settling tank, or between the solid-liquid separation tank and the solid-liquid separation device, and are not discharged outside the wastewater treatment device. Therefore, most of the sludge particles contained in the wastewater remain inside the wastewater treatment device.

[0008] Thus, the wastewater treatment device described in Patent Document 1 has a problem in that it is not possible to efficiently remove sludge particles contained in the wastewater.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wastewater treatment device capable of efficiently capturing and removing solid matter contained in wastewater. [Means for solving the problem]

[0010] The wastewater treatment device of the present invention comprises a first storage tank that receives and temporarily stores wastewater, a solid-liquid separation device that separates a slurry containing solids that have settled in the first storage tank into a solid component and a liquid component, a second storage tank that temporarily stores the liquid component separated from the slurry in the solid-liquid separation device and captures at least a portion of the oil and solids remaining in the liquid component and then releases the liquid component to the outside, and an organic waste storage tank that stores the solid component separated from the slurry in the solid-liquid separation device.

[0011] The wastewater treatment device according to the present invention may further include a pump for pumping up the slurry from the first storage tank and transferring it to the solid-liquid separation device, or may include a plurality of such pumps.

[0012] The wastewater treatment device according to the present invention may include a measuring means for measuring the liquid level in the first storage tank, and a control means for starting and stopping the solid-liquid separator and the pump according to the liquid level in the first storage tank. The control means may start the solid-liquid separator and the pump when the liquid level in the first storage tank rises and exceeds a first reference value, and may stop the solid-liquid separator and the pump when the liquid level in the first storage tank subsequently falls and falls below a second reference value that is below the first reference value.

[0013] The wastewater treatment device according to the present invention includes a measuring means for measuring the liquid level in the first storage tank, and a control means for starting and stopping the solid-liquid separation device and the pumps depending on the liquid level in the first storage tank, and the control means may be configured to start the solid-liquid separation device and any one of the plurality of pumps when the liquid level in the first storage tank rises and exceeds a first reference value, and thereafter, when the liquid level in the first storage tank further rises and exceeds a third reference value, start the other pump, thereby commencing parallel operation of the plurality of pumps.

[0014] In the wastewater treatment device according to the present invention, the first storage tank may be provided with an overflow drain pipe for discharging wastewater overflowing from the first storage tank into the second storage tank.

[0015] The second storage tank of the wastewater treatment device of the present invention may be equipped with a screen that filters out at least a portion of the solids mixed in the liquid components flowing in from the solid-liquid separation device, a grease trap that captures oil contained in the liquid components that have passed through the screen, and a drain pipe that discharges the liquid components that have passed through the screen and the grease trap to the outside.

[0016] The wastewater treatment device of the present invention may comprise a first cleaning shower arranged in the first storage tank and spraying cleaning water into the first storage tank, and a second cleaning shower arranged in the organic waste storage tank and spraying cleaning water into the organic waste storage tank.

[0017] The wastewater treatment device according to the present invention may comprise hot water supply means for supplying hot water to the first washing shower and the second washing shower, and, if necessary, control means for spraying hot water from the first washing shower or the second washing shower.

[0018] The wastewater treatment device according to the present invention may be installed in an apartment building, and may collect wastewater discharged from a plurality of dwelling units constituting the apartment building in a first storage tank and treat the collected wastewater. Effect of the Invention

[0019] The wastewater treatment device according to the present invention can efficiently capture and remove solids contained in wastewater. In addition, the wastewater treatment device according to the present invention can capture and remove oil contained in wastewater. Therefore, if a house or the like is equipped with the wastewater treatment device according to the present invention, the disposer can be installed even in areas where the direct discharge of slurry discharged from a disposer into a public sewer system is restricted. [Brief description of the drawings]

[0020] [Figure 1] 1 is an explanatory diagram showing a configuration of a wastewater treatment device according to an embodiment of the present invention. [Diagram 2] 2 is an explanatory diagram showing the configuration of a first storage tank provided in the wastewater treatment device shown in FIG. 1. FIG. [Diagram 3] FIG. 2 is an explanatory diagram showing the configuration of a solid-liquid separator provided in the wastewater treatment equipment shown in FIG. [Figure 4] FIG. 2 is an explanatory diagram showing the configuration of an organic waste storage tank provided in the wastewater treatment device shown in FIG. [Diagram 5] 2 is an explanatory diagram showing the configuration of a second storage tank provided in the wastewater treatment device shown in FIG. 1. FIG. [Figure 6] FIG. 11 is an explanatory diagram showing a configuration of a wastewater treatment device according to a modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wastewater treatment device according to an embodiment of the present invention will now be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are designated by the same reference numerals.

[0022] (Overall composition) Fig. 1 is a conceptual diagram showing a state in which a wastewater treatment device 2 according to an embodiment of the present invention is installed in an apartment building 1. As shown in Fig. 1, in the apartment building, wastewater discharged from a garbage disposer 4 equipped to a kitchen sink 3 of each dwelling unit is collected in the wastewater treatment device 2, treated as described below, and then discharged into a public sewerage system 5. Note that other wastewater, for example, wastewater discharged from a bathtub 6 or a washbasin 7 of each dwelling unit, is directly discharged into the public sewerage system 5 without passing through the wastewater treatment device 2.

[0023] As shown in Fig. 1, the wastewater treatment device 2 includes a first storage tank 8, a solid-liquid separator 9, an organic waste storage tank 10, and a second storage tank 11. The wastewater treatment device 2 also includes a control device 12 and an operation panel 13. The control device 12 includes a computer (not shown), and various processes described below are performed by the computer executing programs installed in the computer. Operators input operations to the wastewater treatment device 2 via the operation panel 13.

[0024] As shown in FIG. 1, wastewater discharged from a plurality of disposers 4 is collected in one drain pipe and flows into the first storage tank 8, where it is stored. As described above, the wastewater discharged from the disposers 4 contains solid matter such as food waste crushed by the disposers 4. While the wastewater is stored in the first storage tank 8, the solid matter contained in the wastewater settles to the bottom of the first storage tank 8. A pump 14 is disposed at the bottom of the first storage tank 8, and the slurry containing the solid matter that has settled to the bottom of the first storage tank 8 is pumped up by the pump 14 and transferred to the solid-liquid separator 9. Although only one pump 14 is shown in FIG. 1, the first storage tank 8 is provided with two pumps 14, and the two pumps 14 are operated in parallel as necessary.

[0025] The first storage tank 8 is also provided with an overflow drain pipe 15 at its upper part. When wastewater exceeding the processing capacity of the wastewater treatment device 2 flows into the first storage tank 8 and the first storage tank 8 overflows, the overflowing wastewater passes through the overflow drain pipe 15 and flows into the second storage tank 11. The detailed configuration and operation of the first storage tank 8 will be described later.

[0026] The solid-liquid separator 9 is a device that separates the slurry transferred from the first storage tank 8 into a solid component and a liquid component. As shown in Fig. 1, the solid component separated from the slurry in the solid-liquid separator 9 is discharged to an organic waste storage tank 10. The liquid component separated from the slurry is discharged to a second storage tank 11. The detailed configuration and operation of the solid-liquid separator 9 will be described later.

[0027] The solid components discharged from the solid-liquid separation device 9 are stored in an organic waste storage tank 10. As shown in FIG. 1, the organic waste storage tank 10 is equipped with a discharge pipe 16 and an electric valve 17 that opens and closes the discharge pipe 16. A hose 19 of a vacuum truck 18 is connected to the discharge pipe 16 as necessary. By operating the electric valve 17 to open the flow path of the discharge pipe 16, the solid components stored in the organic waste storage tank 10 are sucked into the tank of the vacuum truck 18. The solid components sucked into the tank of the vacuum truck 18 are transported to a treatment facility (not shown). The detailed configuration of the organic waste storage tank 10 will be described later.

[0028] As described above, the liquid component separated from the slurry in the solid-liquid separator 9 is discharged to the second storage tank 11. The solid component contained in the slurry contains various particles with different particle sizes, and some of the particles of the solid component with small particle sizes are mixed with the liquid component squeezed out of the slurry in the solid-liquid separator 9 and discharged to the second storage tank 11. In other words, some solid components remain in the liquid component discharged from the solid-liquid separator 9. Hereinafter, the solid component particles remaining in the liquid component discharged from the solid-liquid separator 9 and stored in the second storage tank 11 will be referred to as "residual solids."

[0029] Furthermore, the wastewater discharged from the disposer 4 often contains oil. Most of this oil is mixed with the liquid component squeezed out from the slurry in the solid-liquid separator 9 and discharged into the second storage tank 11.

[0030] Therefore, the second storage tank 11 is provided with a means for capturing and removing residual solids and oil contained in the liquid component discharged from the solid-liquid separation device 9. The liquid component from which the residual solids and oil have been removed in the second storage tank 11 is discharged into the public sewerage system 5. The detailed configuration and operation of the second storage tank 11 will be described later.

[0031] (First storage tank) Fig. 2 is an explanatory diagram showing the configuration of the first storage tank 8. As shown in Fig. 2, the first storage tank 8 is equipped with a cleaning shower 20 and a level sensor 21. The cleaning shower 20 is a device that is controlled by a control device 12 (not shown in Fig. 2) and sprays cleaning water as necessary to clean the inside of the first storage tank 8. The level sensor 21 is a device that uses ultrasonic waves to measure the liquid level inside the first storage tank 8, and is an example of a measuring means of the present invention.

[0032] The control device 12 is an example of a control means of the present invention, and includes a computer (not shown). The control device 12 controls the operation and stop of the pump 14 and the solid-liquid separator 9 (not shown in FIG. 2) according to the liquid level inside the first storage tank 8 detected by the level sensor 21. That is, when the liquid level inside the first storage tank 8 rises and exceeds a first reference value, the control device 12 starts one of the two pumps 14 and the solid-liquid separator 9. As a result, the slurry stored inside the first storage tank 8 is transferred to the solid-liquid separator 9, where solid-liquid separation is performed.

[0033] Thereafter, when the liquid level inside the first storage tank 8 drops and falls below the second reference value, the control device 12 stops the operation of the pump 14 and the solid-liquid separator 9. If the liquid level inside the first storage tank 8 continues to rise even after the start of operation of one pump 14 and the solid-liquid separator 9 and exceeds the third reference value, the control device 12 starts the other pump 14, and thereafter, the two pumps 14 are operated in parallel. If the liquid level inside the first storage tank 8 further rises and exceeds the fourth reference value, the wastewater that exceeds the fourth reference value flows through the overflow drain pipe 15 into the second second storage tank 11 (not shown in FIG. 2).

[0034] (Solid-liquid separator) FIG. 3 is an explanatory diagram showing the configuration of the solid-liquid separator 9. As shown in FIG. 3, the solid-liquid separator 9 includes an electric motor 22 and a screw rotor 23 that is driven to rotate by the electric motor 22. The screw rotor 23 is surrounded by a cylindrical screen 24. The screen 24 has a large number of small holes. The size of the small holes is set so that the solid components contained in the slurry expected in the wastewater treatment device 2 cannot pass through. The slurry discharged from the first storage tank 8 (not shown in FIG. 3) is introduced into the space inside the screen 24 through the introduction port 25 and pushed upward by the screw rotor 23. Meanwhile, the liquid components contained in the slurry go outside the screen 24 and are discharged from the liquid outlet 26. Meanwhile, the solid components contained in the slurry remain inside the screen 24. The solid components remaining inside the screen 24 are discharged through a solid outlet 27 into the organic waste storage tank 10 (not shown in FIG. 3).

[0035] The solid-liquid separator 9 is also equipped with a washing shower 28. The washing shower 28 is controlled by the controller 12 (not shown in FIG. 3) and sprays washing water to wash the screen 24 as necessary.

[0036] The separation of liquid components in solid-liquid separator 9 is mainly performed by gravity acting on the slurry. Solid-liquid separator 9 is not equipped with a device that actively applies pressure to the slurry to compress it. This is because the slurry discharged from apartment complex 1 generally contains a large amount of water, making it easy to separate the liquid components. Furthermore, compressing the slurry causes a problem in that a large proportion of fine solid particles are mixed into the liquid components separated from the slurry. Because solid-liquid separator 9 is not equipped with a device that actively applies pressure to the slurry, it is possible to suppress the mixing of fine solid particles into the liquid components separated from the slurry.

[0037] (Organic waste storage tank) FIG. 4 is an explanatory diagram showing the configuration of the organic waste storage tank 10. As shown in FIG. 4, the organic waste storage tank 10 is equipped with a cleaning shower 29, a level sensor 30, and a deodorizing tube 31. The cleaning shower 29 is a device that is controlled by the control device 12 (not shown in FIG. 4) and sprays cleaning water as necessary to clean the inside of the organic waste storage tank 10. The level sensor 30 is a device that uses ultrasonic waves to detect the height of the organic waste stored inside the organic waste storage tank 10. The deodorizing tube 31 is a pipe that exhausts odors that remain in the organic waste storage tank 10. As described above, a discharge pipe 16 is connected to the organic waste storage tank 10.

[0038] (Second storage tank) Fig. 5 is an explanatory diagram showing the configuration of the second storage tank 11. As shown in Fig. 5, the second storage tank 11 is equipped with a screen 32 and three partition plates 33, 34, and 35. The screen 32 is a kind of strainer, and is a basket-shaped container with many small holes. The second storage tank 11 is also divided into three compartments A, B, and C by the three partition plates 33, 34, and 35.

[0039] As shown in FIG. 5, the liquid component discharged from the solid-liquid separator 9 (not shown in FIG. 5) and flowing into the second storage tank 11 passes through the screen 32 and enters the section A of the second storage tank 11. Of the residual solids contained in the liquid component flowing into the second storage tank 11, those with relatively large particle sizes are captured by the screen 32 and remain there. The residual solids contained in the liquid component flowing into the second storage tank 11 that pass through the screen 32, i.e., the residual solids with relatively small particle sizes, settle to the bottom of the section A while the liquid component remains in the section A. In this way, the second storage tank 11 can capture the residual solids contained in the liquid component flowing in from the solid-liquid separator 9.

[0040] The liquid component that flows into the section A rises between the partition plates 33 and 34 and flows into the section B. The oil contained in the liquid component that flows into the section B rises there and floats on the liquid surface. Since the liquid surface in the section B is partitioned by the partition plates 33 and 35, the oil floating on the liquid surface cannot escape to the outside of the section B. Meanwhile, the liquid component in the lower layer of the section B passes under the partition plate 35 and flows into the section C, and is further discharged through the drain pipe 36 to the public sewerage system 5. In this way, the second storage tank 11 is partitioned into three sections A, B, and C by the three partition plates 33, 34, and 35. The liquid component of the wastewater dropped into the section A falls inside the section A, passes between the partition plates 33 and 34, flows into the section B, and rises there. The oil contained in the wastewater has a smaller specific gravity than water, so it floats to the liquid surface in the section B. The wastewater in the lower layer of compartment B flows between partitions 34 and 35 into compartment C, and is then discharged into the public sewerage system through drain pipe 36. Meanwhile, the oil floating on the surface of compartment B cannot sink to the lower layer of compartment B, and so remains in compartment B. In this way, second storage tank 11 also functions as a grease trap that captures the oil contained in the liquid component flowing in from solid-liquid separation device 9.

[0041] As shown in FIG. 1, residual solids and oils captured and stored in the second storage tank 11 can be removed, if necessary, using a vacuum truck 18.

[0042] (Modification) In the above embodiment, as shown in Fig. 1, the miscellaneous wastewater discharged from the bathtub 6, the washbasin 7, etc. is discharged directly into the public sewerage system 5 without passing through the wastewater treatment device 2, but there are regions where it is strongly required to suppress the inflow of oil into the public sewerage system 5. In such regions, as shown in Fig. 6, the miscellaneous wastewater discharged from the bathtub 6, the washbasin 7, etc. may be discharged into the public sewerage system 5 via the second storage tank 11. If this configuration is selected, even if oil gets mixed into the miscellaneous wastewater, the oil is captured in the second storage tank 11, so that the inflow of the oil into the public sewerage system 5 is suppressed.

[0043] As described above, the wastewater treatment device 2 according to this embodiment is provided with the solid-liquid separation device 9, and therefore can separate and remove solid matter from the wastewater discharged from the disposer 4. In addition, the residual solid matter and oil that could not be captured by the solid-liquid separation device 9 can be captured and removed in the second storage tank 11.

[0044] Furthermore, according to the wastewater treatment device 2 of this embodiment, wastewater that has completed a specific treatment is not returned to the previous step to repeat the same treatment, so that solids and the like can be removed efficiently.

[0045] However, the technical scope of the present invention is not limited to the above-mentioned embodiment, and the present invention can be freely applied, modified, or improved within the scope of the technical concept described in the claims.

[0046] In particular, the specific mechanical configuration of the wastewater treatment device 2 shown in Figures 1 and 2 is illustrative, and the technical scope of the present invention is not limited by the specific mechanical configuration of the wastewater treatment device 2 shown in Figures 1 and 2.

[0047] In the above description of the embodiment, an example in which the first storage tank 8 is provided with two pumps 14 has been shown, but the number of pumps 14 may be one. The first storage tank 8 may be provided with three or more pumps 14.

[0048] In the above embodiment, an example of the solid-liquid separator 9 that mainly uses gravity acting on the slurry to separate liquid components from the slurry has been shown, but the solid-liquid separator 9 is not limited to such a configuration. The solid-liquid separator 9 may be equipped with a device that actively applies pressure to the slurry to compress it. For example, a spring-loaded blocking plate that is biased in a direction to block the outlet of the screen 24 may be provided at the outlet of the screen 24 to apply pressure to the slurry between the screw rotor 23 and the blocking plate. For example, large-scale cooking facilities installed in schools, hospitals, etc. tend to discharge slurries with low water content, i.e., high solid content. When the wastewater treatment device 2 is installed in such a facility, it is convenient for the solid-liquid separator 9 to be equipped with a device that actively applies pressure to the slurry to compress it.

[0049] In the above description of the embodiment, the level sensors 21 and 30 using ultrasonic waves are given as specific examples of the measuring means for measuring the liquid level, but such measuring means are not limited to non-contact sensors using ultrasonic waves. Such means may use radio waves or laser light, may measure the liquid pressure, or may be a mechanical switch such as a float switch.

[0050] Furthermore, the cleaning water sprayed by the cleaning showers 20, 28, 29 is not limited to room temperature water. A hot water supply means may be provided so that hot water is sprayed from the cleaning showers 20, 28, 29. Also, the control device may operate the cleaning showers 20, 28, 29 according to a preset schedule.

[0051] In the above embodiment, an example in which the wastewater treatment device 2 is installed in an apartment building has been shown, but the installation location of the device according to the present invention is not limited to an apartment building. The device according to the present invention may be installed in a detached house, or in a hotel or inn. In addition, the treatment target of the device according to the present invention is not limited to wastewater discharged from a disposer 4. The device according to the present invention can be widely applied to the treatment of slurry wastewater that cannot be directly discharged into a public sewer system. [Explanation of symbols]

[0052] 1. Apartment building, 2. Wastewater treatment device, 3. Kitchen sink, 4. Disposer, 5. Public sewer system, 6. Bathtub, 7. Washstand, 8. First storage tank, 9. Solid-liquid separation device, 10 organic waste storage tank, 11 second storage tank, 12 control device, 13 operation panel, 14 pump, 15 overflow drain pipe, 16 discharge pipe, 17 electric valve, 18 vacuum truck, 19 hose, 20 cleaning shower, 21 level sensor, 22 electric motor, 23 screw rotor, 24 screen, 25 inlet, 26 liquid outlet, 27 solid outlet, 28, 29 cleaning shower, 30 level sensor, 31 deodorizing tube, 32 screen, 33, 34, 35 partition plate, 36 drain pipe, A, B, C compartment

Claims

1. a first storage tank for receiving and temporarily storing the wastewater; a solid-liquid separator that separates the slurry containing the solid matter precipitated in the first storage tank into a solid component and a liquid component; a second storage tank for temporarily storing the liquid component separated from the slurry in the solid-liquid separation device, capturing at least a portion of the oil and solid matter remaining in the liquid component, and then discharging the liquid component to the outside; An organic waste storage tank for storing the solid component separated from the slurry in the solid-liquid separation device. Wastewater treatment equipment.

2. A pump is provided to pump the slurry from the first storage tank and transfer it to the solid-liquid separation device. The wastewater treatment device according to claim 1.

3. A plurality of the pumps are provided. The wastewater treatment device according to claim 2.

4. A measuring means for measuring a liquid level in the first storage tank; A control means is provided for starting and stopping the solid-liquid separator and the pump in response to a liquid level in the first storage tank. The wastewater treatment device according to claim 2 or 3.

5. The control means When the liquid level in the first storage tank rises and exceeds a first reference value, the solid-liquid separator and the pump are started; thereafter, when the liquid level in the first storage tank decreases and falls below a second reference value that is lower than the first reference value, the solid-liquid separator and the pump are stopped; The wastewater treatment device according to claim 4.

6. A measuring means for measuring a liquid level in the first storage tank; A control means is provided for starting and stopping the solid-liquid separator and the pump in response to a liquid level in the first storage tank, The control means When the liquid level in the first storage tank rises and exceeds a first reference value, starting the solid-liquid separation device and any one of the plurality of pumps; thereafter, when the liquid level in the first storage tank further rises and exceeds a third reference value, another of the pumps is started to start up, thereby starting parallel operation of the plurality of the pumps. The wastewater treatment device according to claim 3.

7. The first storage tank includes an overflow drain pipe that drains the wastewater overflowing from the first storage tank into the second storage tank. The wastewater treatment device according to any one of claims 1 to 3.

8. The second storage tank includes a screen for filtering out at least a portion of solid matter mixed in the liquid component flowing in from the solid-liquid separation device; a grease trap that captures oil contained in the liquid component that has passed through the screen; A drain pipe is provided for discharging the liquid component that has passed through the screen and the grease trap to the outside. The wastewater treatment device according to any one of claims 1 to 3.

9. a first washing shower disposed in the first storage tank and configured to spray washing water into the first storage tank; and a second cleaning shower disposed in the organic waste storage tank and configured to spray cleaning water into the organic waste storage tank. The wastewater treatment device according to any one of claims 1 to 3.

10. hot water supply means for supplying hot water to the first washing shower and the second washing shower; If necessary, a control means is provided for spraying hot water from the first washing shower or the second washing shower. The wastewater treatment device according to claim 9.

11. The wastewater treatment system is installed in an apartment building, and wastewater discharged from a plurality of dwelling units constituting the apartment building is collected in the first storage tank and treated therein. The wastewater treatment device according to any one of claims 1 to 3.

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