Circulating toilet system

Abstract

To provide a portable toilet system capable of achieving compactification of a closed-loop toilet system.SOLUTION: A closed-loop toilet system 10 comprises: multi-stage digestion tanks 11 to 13 that purify circulating water; an ozone treatment tank 14 that decolorizes the circulating water that has passed through the multiple-stage digestion tanks 11 to 13; a plurality of treatment tanks 11 to 15 including a washing water storage tank 15 that stores the circulating water that has passed through the ozone treatment tank 14; washing water return parts 25, 31 that return the circulating water from the washing water storage tank 15 to a toilet 5; and a building 60 that has a tank installation space 72 in which the plurality of treatment tanks 11 to 15 are installed, wherein each of the treatment tanks 11 to 15 is formed in a substantially rectangular parallelepiped shape, some of the plurality of treatment tanks 11 to 15 are arranged such that adjacent treatment tanks are in contact with or close to each other and are arranged in a predetermined direction in order in which the circulating water flows in the tank installation space 72, and remains of the plurality of treatment tanks 11 to 15 are arranged in the direction perpendicular to the predetermined direction with adjacent treatment tanks touching or close to each other in the order in which the circulating water flows.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a circulating toilet system that purifies sewage discharged from a toilet and uses it as toilet flushing water.

Background Art

[0002] Conventionally, a circulating toilet system that purifies sewage discharged from a toilet and uses it as toilet flushing water has been known. Patent Document 1 describes a circulating flushing toilet system.

[0003] Specifically, the circulating flushing toilet system described in Patent Document 1 includes a flushing toilet, a biological treatment tank that decomposes organic substances contained in the sewage from the flushing toilet and performs nitrification and denitrification treatment, a filtration device that separates solid and liquid of the primary treated water treated in the biological treatment tank, a first circulation pump that circulates the remaining high-concentration sludge resulting from the solid-liquid separation in the filtration device to the biological treatment tank, an ozone decolorization device that oxidizes and decolorizes the filtered water with ozone, a second circulation pump that circulates the treated water oxidized by ozone to the flushing toilet as flushing water, and a third circulation pump that circulates the surplus of the oxidized treated water to the biological treatment tank as surplus treated water.

Prior Art Documents

Patent Documents

[0004] 环型

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the circulating toilet system described in Patent Document 1, the treatment tanks are arranged in one direction. Therefore, when constructing a portable toilet system, it is not easy to make it compact.

[0006] This invention has been made in view of these circumstances, and aims to make a circulating toilet system more compact and to realize a portable toilet system. [Means for solving the problem]

[0007] To solve the above-mentioned problems, the first invention is a circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet, comprising: a plurality of treatment tanks, each having a plurality of septic tanks for purifying the circulating water discharged from the toilet; an ozone treatment tank for decolorizing the circulating water that has passed through the plurality of septic tanks; a flushing water storage tank for storing the circulating water that has passed through the ozone treatment tank; a flushing water return section for returning the circulating water from the flushing water storage tank to the toilet; and a building having a space for installing the tanks in which the plurality of treatment tanks are installed, wherein each of the plurality of treatment tanks is formed in a substantially rectangular parallelepiped shape, and in the space for installing the tanks, a portion of the plurality of treatment tanks are arranged in a predetermined direction in the order in which the circulating water flows, with adjacent treatment tanks touching or being close to each other, and the remaining plurality of treatment tanks are arranged in a direction perpendicular to the predetermined direction in the order in which the circulating water flows, with adjacent treatment tanks touching or being close to each other.

[0008] The second invention is that, in the first invention, adjacent septic tanks have a bolt-shaped connecting pipe with a through hole formed in the axial direction and a nut-shaped tightening member that is screwed onto the shaft of the connecting pipe, and the two side walls of the adjacent septic tanks are sandwiched between the head of the connecting pipe and the tightening member, thereby connecting the adjacent septic tanks.

[0009] The third invention further comprises an air supply device in the first or second invention that supplies air below the liquid surface of at least some of the septic tanks of a multi-stage septic tank, thereby making the septic tanks aeration tanks, wherein at least the aeration tanks among the multi-stage septic tanks have a container body with an opening formed on the upper side and a lid member that is placed on the edge of the opening in the container body so as to close the opening, and further, a non-contact state is created between the upper surface of the edge of the opening and the lower surface of the lid member without a sealing member, so as to create a gap through which moisture evaporating in the aeration tank can pass, and a humidity reduction section is provided in the space for installing the tanks to reduce the humidity of the space for installing the tanks.

[0010] The fourth invention is that, in the third invention, the space for installing the tanks is provided with an air intake port for drawing in air from outside and an exhaust port with a fan for forcibly exhausting air to the outside as a humidity reduction section, and in the space for installing the tanks, multiple treatment tanks are arranged in the order in which the circulating water flows, and in the space for installing the tanks, the air intake port is located on the downstream side of the washing water storage tank, and the exhaust port is located on the upstream side of the aeration tank.

[0011] The fifth invention is a recirculating toilet system that, in any one of the first to fourth inventions, further includes a rainwater introduction section for introducing rainwater into the circulating system through which circulating water is circulated.

[0012] The sixth invention is configured such that, in the fifth invention, the rainwater introduction unit introduces rainwater into the wash water storage tank when the liquid level in the wash water storage tank falls below a predetermined water level.

[0013] The seventh invention is a circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet, comprising: a plurality of treatment tanks having a plurality of septic tanks for purifying the circulating water discharged from the toilet, a flushing water storage tank for storing the circulating water purified by the plurality of septic tanks, a flushing water return section that returns the circulating water from the flushing water storage tank to the toilet, an air supply device that supplies air below the liquid surface of at least some of the plurality of septic tanks to make the septic tanks aeration tanks, and a building having a space for installing the tanks in which the plurality of septic tanks are installed, wherein at least the aeration tank among the plurality of septic tanks has a container body with an opening formed on the upper side and a lid member that is placed on the edge of the opening on the container body so as to close the opening, and further, a gap is formed between the upper surface of the edge of the opening and the lower surface of the lid member in a non-contact state without a sealing member, so as to allow moisture evaporating in the aeration tank to pass through, and a humidity reduction section is provided in the space for installing the tanks to reduce the humidity of the space for installing the tanks. [Effects of the Invention]

[0014] In this invention, each treatment tank is formed in a substantially rectangular parallelepiped shape. In the space for installing the tanks in the building, some of the treatment tanks are arranged in a predetermined direction such that adjacent treatment tanks are in contact with or close to each other, and in the order in which the circulating water flows. The remaining treatment tanks are arranged in a direction perpendicular to the predetermined direction, such that adjacent treatment tanks are in contact with or close to each other, and in the order in which the circulating water flows. For example, the treatment tanks can be arranged in an L-shape as shown in Figure 4, and can be compactly installed in a building with a toilet space. Therefore, it is possible to make the circulating toilet system more compact and realize a portable toilet system.

[0015] In another invention, in at least the aeration tank among the multiple-stage septic tanks, a gap is formed between the upper surface of the edge of the opening of the container body and the lower surface of the lid member without providing a sealing member, allowing moisture evaporating in the aeration tank to pass through. Furthermore, a humidity reduction unit is provided in the tank installation space where the multiple treatment tanks are arranged. In conventional circulating toilet systems, each treatment tank has a sealed structure. Therefore, when the number of toilet users increases and the amount of circulating water increases, the amount of circulating water does not decrease easily. When it was necessary to reduce the amount of circulating water, maintenance such as pumping out the circulating water and sprinkling water was required. In contrast, the inventors of the present invention have realized that by allowing moisture to be discharged from the aeration tank appropriately through the above-mentioned gap, and by reducing the humidity in the tank installation space, the problem of having to pump out the circulating water is resolved, and situations where there is a shortage of circulating water rarely occur. Therefore, even when the amount of circulating water increases, it is possible to realize a circulating toilet system in which the amount of circulating water is naturally optimized. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram of a circulating toilet system according to an embodiment. [Figure 2] Figure 2(a) is a perspective view of the top of a septic tank to illustrate the lid structure of a septic tank in a recirculating toilet system, and Figure 2(b) is a side view of the lid member. [Figure 3] Figure 3(a) is a perspective view of the building housing the recirculating toilet system, seen from the front, and Figure 3(b) is a perspective view of the interior of the building, seen from the rear. [Figure 4] Figure 4 is a floor plan of the building containing the recirculating toilet system. [Figure 5] Figure 5 is a cross-sectional view of a connecting structure that links adjacent septic tanks. [Modes for carrying out the invention]

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0018] This embodiment is a circulating toilet system 10 including a toilet 5 having a toilet bowl 6 and a low tank 7, and a sewage treatment device 8 for treating sewage discharged from the toilet bowl 6. The circulating toilet system 10 is a circulating system that purifies the sewage from the toilet bowl 6 by the sewage treatment device 8 and uses it as the washing water for the toilet 5. Note that between the toilet bowl 6 and a first purification tank 11 described later, a crushing pump 9 is provided that sends the sewage discharged from the toilet bowl 6 to the first purification tank 11 and crushes the contaminants (such as toilet paper) contained in the sewage. [Configuration of Sewage Treatment Device]

[0019] As shown in FIG. 1, the sewage treatment device 8 includes a plurality of stages of purification tanks 11 to 13, an ozone treatment tank 14 that oxidizes and decolorizes the treated water discharged from the plurality of stages of purification tanks 11 to 13, and a washing water storage tank 15 that stores the washing water that has passed through the ozone treatment tank 14.

[0020] The plurality of stages of purification tanks 11 to 13 are purification tanks 11 to 13 that utilize microorganisms to purify contaminants, and include a first purification tank 11 located on the most upstream side, a second purification tank 12 connected to the downstream side of the first purification tank 11, and a third purification tank 13 connected to the downstream side of the second purification tank 12 and located on the most downstream side.

[0021] An introduction pipe 20 for introducing sewage (raw water to be treated) discharged from the toilet bowl 6 is connected to the first purification tank 11. The upper part of the first purification tank 11 is connected to the upper part of the second purification tank 12 via a first connection part 21. When the liquid level of the first purification tank 11 rises and reaches the height of the first connection part 21, the overflowed raw water to be treated flows into the second purification tank 12 through the first connection part 21. Here, the introduction pipe 20 opens above the liquid level in the first purification tank 11. That is, the introduction pipe 20 opens above the opening of the first connection part 21. The first purification tank 11 serves as a flow rate adjustment tank.

[0022] The upper part of the second purification tank 12 is connected to the upper part of the third purification tank 13 via the second connection part 22. When the liquid level of the second purification tank 12 rises and reaches the height of the second connection part 22, the overflow-treated water flows into the third purification tank 13 through the second connection part 22. The upper part of the third purification tank 13 is connected to the ozone treatment tank 14 via the third connection part 23. When the liquid level of the third purification tank 13 rises and reaches the height of the third connection part 23, the overflow-treated water flows into the ozone treatment tank 14 through the third connection part 23. In the present embodiment, the first connection part 21 and the second connection part 22 are constituted by a connection structure 80 described later, and the third connection part 23 is constituted by a pipe. Incidentally, the opening heights of the first to third connection parts 21 to 23 are the same as each other.

[0023] The upper part of the ozone treatment tank 14 is connected to the washing water storage tank 15 via the fourth connection part 24. When the liquid level of the ozone treatment tank 14 rises and reaches the height of the fourth connection part 24, the overflow washing water flows into the washing water storage tank 15 through the fourth connection part 24. A washing water supply pipe 25 provided with a circulation pump 31 is connected to the washing water storage tank 15. The washing water supply pipe 25 and the circulation pump 31 constitute a washing water return part. The inlet of the washing water supply pipe 25 opens at a height near the bottom of the washing water storage tank 15. The outlet of the washing water supply pipe 25 is connected to the low tank 7. Thereby, in the circulation type toilet system 10, a circulation system for returning the treated water by the sewage treatment device 8 to the low tank 7 as washing water is constituted. Hereinafter, the water circulating in the circulation system is referred to as "circulating water".

[0024] In each of the purification tanks 11 to 13, a plurality of filter materials 30 suitable for the growth and activity of microorganisms are immersed. As the filter material 30, a porous drainage treatment filter material and a biological deodorization filter material (a filter material called "volcanite") mainly composed of natural component black ink soil is used. Incidentally, the filter material 30 is not limited to volcanite, and various materials can be used.

[0025] In this embodiment, the first septic tank 11 and the second septic tank 12 function as aerobic tanks that purify wastewater mainly by aerobic microorganisms, and the third septic tank 13 functions as an anaerobic tank that purifies wastewater mainly by anaerobic microorganisms. The wastewater treatment device 8 further includes an aeration pipe 32 for supplying air to the first septic tank 11 and the second septic tank 12, and an air supply device (such as a blower) 33 for supplying air to the aeration pipe 32. The aeration pipe 32 has a main pipe 32a extending from the air supply device 33 and branching into two branch pipes 32b and 32c along the way. The first branch pipe 32b is connected to the first septic tank 11, and the second branch pipe 32c is connected to the second septic tank 12. The outlet sides of each branch pipe 32b and 32c are located near the bottom surfaces of the septic tanks 11 and 12. Numerous holes are formed on the outlet side of each branch pipe 32b and 32c, and air is discharged from these numerous holes.

[0026] An ozone generator 34 is connected to the ozone treatment tank 14. In this embodiment, the ozone generator 34 is installed in a branch pipe 32d that branches off from the main pipe 32a of the aeration piping 32, so that the ozone generated by the ozone generator 34 can be supplied to the ozone treatment tank 14 using air supplied from the air supply device 33. The outlet of the branch pipe 32d opens near the bottom surface of the ozone treatment tank 14.

[0027] The wastewater treatment device 8 further includes a sludge return pipe 35 for returning sludge from the third septic tank 13 to the first septic tank 11, and a pump 36 for transferring the sludge through the sludge return pipe 35. The inlet side of the sludge return pipe 35 is located near the bottom surface of the third septic tank 13. Numerous holes are formed on the inlet side of the sludge return pipe 35. The pump 36 is an air-lift pump that generates suction force using air supplied from the air supply device 33. A branch pipe 32e, which branches off from the main pipe 32a of the aeration pipe 32, is connected to the pump 36. The air supply device 33 is used not only for aeration but also for supplying ozone and transferring sludge. When air is supplied from the air supply device 33 to the pump 36, sludge is sucked in from the inlet end of the sludge return pipe 35 and from the numerous holes on the inlet side, and the sucked sludge is sent to the first septic tank 11 via the sludge return pipe 35. [Structure of the lid of a septic tank]

[0028] The lid structures of each septic tank 11 to 13 will be explained with reference to Figure 2. Note that the same lid structure is used for septic tanks 11 to 13 in this embodiment.

[0029] Each of the septic tanks 11 to 13 is equipped with a lid structure consisting of a container body 50 with an opening 50a formed on its upper side, and a lid member 51 for closing the opening 50a, as shown in Figure 2(a). The opening 50a is approximately rectangular in shape when viewed from above. On the upper surface of the container body 50, the edge of the opening 50a is slightly lower than the surrounding area, forming a lid mounting surface 50b on which the lid member 51 is directly placed. The lid mounting surface 50b is provided around the entire circumference of the opening 50a and is approximately rectangular in shape when viewed from above. Note that in Figure 2(a), the lid member 51 of the first septic tank 11 is removed, and the description of the connecting structure 80 that connects the first septic tank 11 and the second septic tank 12 is omitted.

[0030] The lid member 51 is made of a hard plastic such as FRP. As shown in Figure 2(b), the lid member 51 comprises a flat closing member 51a and a handle 51b attached to the upper surface of the closing member 51a. The closing member 51a is substantially rectangular in plan view. The closing member 51a is slightly larger than the opening 50a and slightly smaller than the outer circumference of the lid mounting portion 50b. When the lid member 51 is placed on the lid mounting portion 50b, the lid member 51 fits into the recess made by the lid mounting portion 50b.

[0031] Here, a small gap is formed between the upper surface of the lid mounting portion 50b and the lower surface of the closing member 51a of the lid member 51, without any elastic or flexible sealing member (such as a gasket), allowing water evaporated in the septic tanks 11-13 to pass through. This small gap is formed around the entire perimeter of the opening 50a. In this embodiment, a portion of the water evaporated in each of the septic tanks 11-13 is discharged through this small gap. The lid member 51 is relatively light in weight, and is designed so that it is not strongly pressed against the lid mounting portion 50b by its own weight. This makes the small gap more suitable for the discharge of an appropriate amount of water.

[0032] Furthermore, in this embodiment, the ozone treatment tank 14 and the wash water storage tank 15 also employ a non-adherent lid structure similar to that of each septic tank 11-13. The ozone treatment tank 14 and the wash water storage tank 15 have openings on their top surfaces that are connected to each other (not shown), and the opening spanning both the ozone treatment tank 14 and the wash water storage tank 15 is closed by a single lid member 50.

[0033] In this embodiment, the amount of water evaporated increases in the first and second septic tanks 11 and 12, which serve as aeration tanks, and a portion of the evaporated water is discharged through the minute gap between the blocking member 51a and the lid mounting portion 50b. In addition, in the third septic tank 13, the ozone treatment tank 14, and the wash water storage tank 15, the amount of evaporation is less than in the aeration tanks, but a portion of the evaporated water is discharged through the aforementioned minute gap. In this embodiment, by employing a non-tight lid structure in at least the first and second septic tanks 11 and 12, which serve as aeration tanks, the increase in excess water in the circulation system is suppressed, and the amount of water in the circulation system is optimized. [Rainwater intake section]

[0034] In the circulating toilet system 10, if the number of users per predetermined period is small, the amount of water in the circulating system will gradually decrease, and there is a risk that the flushing water in the low tank 7 will become insufficient. For this reason, the wastewater treatment device 8 is further equipped with a rainwater inlet 40 for introducing rainwater into the circulating system. The rainwater inlet 40 is configured to introduce rainwater into the flushing water storage tank 15 when the liquid level in the flushing water storage tank 15 falls below a predetermined water level.

[0035] Specifically, the rainwater intake section 40 includes a rainwater intake section 41 that collects rainwater at the top of the building 60, a rainwater intake pipe 42 that connects the rainwater intake section 41 to the wash water storage tank 15, and a rainwater volume control valve 43 that controls the amount of rainwater introduced into the wash water storage tank 15 through the rainwater intake pipe 42. A filter 44 is provided in the rainwater intake pipe 42.

[0036] The rainwater flow control valve 43 includes a first outlet 43a that opens into the wash water storage tank 15 and a second outlet 43b that opens outside the wash water storage tank 15 (outdoors). The rainwater flow control valve 43 opens the first outlet 43a when the liquid level in the wash water storage tank 15 is below a predetermined level, and opens the second outlet 43b when the first outlet 43a is closed. In this embodiment, a ball tap is used as the valve mechanism in the rainwater flow control valve 43. In this embodiment, the rainwater intake section 41 is connected to the wash water storage tank 15, but the rainwater intake section 41 may also be connected to the ozone treatment tank 14 or the septic tanks 11-13. Alternatively, a tank for collecting rainwater may be connected to the rainwater introduction pipe 42. [Layout of toilet units within the building]

[0037] The circulating toilet system 10 includes a building 60 that houses a toilet 5 and a wastewater treatment device 8. The building 60 is formed in a substantially rectangular parallelepiped shape, as shown in Figures 3(a) and 3(b).

[0038] The interior space of building 60 is divided by a first partition wall 61 and a second partition wall 62 into a toilet space 71 where the toilet bowl 6 and low tank 7 are located, and a tank installation space 72 where the treatment tanks 11-15 of the wastewater treatment device 8 are located. A door 63 for entering and exiting the toilet space 71 is provided on the front exterior wall of building 60. As shown in Figure 4, in plan view, the toilet space 71 is roughly rectangular, and the tank installation space 72 is roughly L-shaped. In Figure 4, the exterior wall and partition walls 61 and 62 of building 60 are shown with thick lines. In the following, the front-to-back direction of building 60 in plan view will be referred to as the "first direction," and the direction perpendicular to the first direction will be referred to as the "second direction."

[0039] In the tank installation space 72, viewed from the front, the first to third septic tanks 11 to 13 are arranged in this order from the front in the first direction, in the space 72a opposite to the toilet space 71, with the first partition wall 61 in between. Here, each septic tank 11 to 13 is formed in a roughly rectangular parallelepiped shape. The first to third septic tanks 11 to 13 are all the same height, and their horizontal dimensions when viewed in the first direction are also the same. The first to third septic tanks 11 to 13 are arranged in the first direction such that adjacent septic tanks 11 to 13 are touching or close to each other, and in the order in which the circulating water of the circulating toilet system 10 flows.

[0040] Furthermore, in the tank installation space 72, the ozone treatment tank 14 and the flushing water storage tank 15 are arranged in the space 72b behind the toilet space 71, separated by the second partition wall 62. Here, the ozone treatment tank 14 and the flushing water storage tank 15 are formed in a roughly rectangular parallelepiped shape. The ozone treatment tank 14 and the flushing water storage tank 15 have the same height and the same horizontal dimensions when viewed in the second direction. As shown in Figure 1, the height of the ozone treatment tank 14 and the flushing water storage tank 15 is slightly lower than that of each septic tank 11-13. The ozone treatment tank 14 is positioned in contact with or close to the third septic tank 13. The ozone treatment tank 14 and the flushing water storage tank 15 are in contact with or close to each other and are arranged in this order in the first direction.

[0041] Furthermore, in this embodiment, the connection structure 80 shown in Figure 5 is employed so that adjacent septic tanks 11 to 13 are connected in a state where they are in contact with or close to each other. The connection structure 80 is used to connect the first septic tank 11 to the second septic tank 12, and to connect the second septic tank 12 to the third septic tank 13.

[0042] The connection structure 80 includes a bolt-shaped connecting pipe (such as a PVC nipple) 81, a nut-shaped tightening member 82, and a plurality of packings 83. The connecting pipe 81 has a cylindrical shaft portion 81a with male threads formed on its outer circumference, and a head portion 81b integrated with one end of the shaft portion 81a. A flow path 81c is formed in the connecting pipe 81 by an axial through hole. Female threads are formed on the inner circumference of the tightening member 82.

[0043] The connection structure 80 is constructed by passing the shaft portion 81a of the connecting pipe 81 through the through-holes in the two side walls 85 of adjacent septic tanks 11-13, and then screwing the tightening member 82 onto the shaft portion 81a. This causes the head portion 81b of the connecting pipe 81 and the tightening member 82 to sandwich the two side walls 85 of adjacent septic tanks 11-13. As a result, adjacent septic tanks 11-13 are connected in a state where their internal spaces are connected to each other. During this connection, packings 83 are provided between the head portion 81b of the connecting pipe 81 and one side wall 85, and between the tightening member 82 and the other side wall 85.

[0044] Furthermore, as shown in Figure 4, the exterior wall of the building 60 is provided with an air intake 91 for drawing in air from outside and an exhaust port 92 for exhausting air to the outside, as humidity reduction sections. The air intake 91 is provided on the exterior wall of the building 60 so as to face the space above the washing water storage tank 15 in the building 60. The exhaust port 92 is provided on the exterior wall of the building 60 so as to face the space above the first septic tank 11 in the building 60. In the tank installation space 72, multiple treatment tanks 11 to 15 are arranged in the order in which the circulating water of the circulating toilet system 10 flows, with the air intake 91 located on the downstream side of the washing water storage tank 15 and the exhaust port 92 located on the upstream side of the aeration tank 11.

[0045] The intake port 91 is made of a louver. The exhaust port 92 is equipped with an exhaust fan (ventilation fan) to promote exhaust, and the exhaust fan is kept running at all times. As a result, air inside the building 60 is forcibly exhausted from the exhaust port 92, and consequently, air is naturally drawn in from the intake port 91. Inside the building 60, an airflow is formed from the intake port 91 to the exhaust port 92. [Effects of this embodiment, etc.]

[0046] In this embodiment, the shape of each of the multiple treatment tanks 11 to 15 is made to be approximately a rectangular parallelepiped, and by connecting the treatment tanks 11 to 15 adjacent to each other or close to each other using a connecting structure 80, multiple treatment tanks 11 to 15 can be installed in a space-saving manner. Furthermore, in the tank installation space 72 of the building 60, some of the multiple treatment tanks 11 to 15 are arranged in a predetermined direction in the order in which the circulating water flows, and the remaining multiple treatment tanks 11 to 15 are arranged in a direction perpendicular to the predetermined direction in the order in which the circulating water flows. Multiple treatment tanks 11 to 14 can be arranged in an L-shape as shown in Figure 4, etc., and can be compactly fitted within the building 60 which is provided with a toilet space 71. Therefore, the circulating toilet system 10 can be made more compact and a portable toilet system can be realized. A container house can also be used for the building 60. In addition, by using hard plastics such as FRP for the material of the multiple treatment tanks 11 to 15, the circulating toilet system 10 can be made lighter and its seismic resistance can be improved.

[0047] In this embodiment, moisture can be discharged appropriately mainly from the aeration tanks 11 and 12 through the aforementioned minute gaps, and the humidity in the tank installation space 72 is reduced by exhausting to the outside. This eliminates the problem of having to pump out the circulating water, and also virtually eliminates the problem of insufficient circulating water. According to this embodiment, even when the amount of circulating water increases, a circulating toilet system 10 can be realized in which the amount of circulating water is naturally adjusted to the appropriate level. Furthermore, in this embodiment, since volcanite is used for the filter media 30 of each septic tank 11 to 13, odor problems do not occur even if the above minute gaps are provided.

[0048] In this embodiment, a fan is provided to facilitate exhaust through the exhaust port 92. Furthermore, in the tank installation space 72, the intake port 91 is located on the downstream side of the washing water storage tank 15, and the exhaust port 92 is located on the upstream side of the first septic tank 11. As a result, an airflow is formed in the tank installation space 72 from the intake port 91 to the exhaust port 92. This stably reduces the humidity in the tank installation space 72, allowing for a more optimal amount of circulating water.

[0049] In this embodiment, since a rainwater introduction unit 40 is provided, even if the number of users of the circulating toilet system 10 is extremely small, a shortage of circulating water is unlikely to occur. In addition, when the liquid level in the flushing water storage tank 15 falls below a predetermined level, rainwater is automatically introduced into the flushing water storage tank 15, so there is no need for workers to introduce rainwater into the circulation system. According to this embodiment, it is possible to realize a circulating toilet system 10 that is easy to maintain and in which the amount of circulating water is naturally optimized.

[0050] In this embodiment, a flexible pipe (not shown) is used for the inlet pipe 20, and the bending shape of the inlet pipe 20 can be optimized to reduce pressure loss in the inlet pipe 20. Therefore, even if the wastewater contains a lot of waste, the wastewater can be smoothly transferred from the toilet bowl 6 to the first treatment tank 11.

[0051] [Other embodiments] In the above embodiment, in order to ensure that the flushing water remains colorless even when the number of users of the circulating toilet system 10 increases, an activated carbon tank with an automatic backwashing function may be connected to the flushing water storage tank 15.

[0052] In the above embodiment, solar panels may be installed on the upper surface of the building 60, and a battery may be installed to store the electricity generated by the solar panels, so that power is supplied from the battery to the electrical equipment (pumps 31, 36, etc.) of the circulating toilet system 10.

[0053] In the embodiment described above, the multiple processing tanks 11 to 15 are arranged in an L-shape in a plan view, but other arrangements such as a T-shape may also be adopted. [Industrial applicability]

[0054] This invention is applicable to a circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet. [Explanation of symbols]

[0055] 5 Toilets 8. Wastewater treatment equipment 10. Circulating toilet system 11. First septic tank (treatment tank, aeration tank) 12. Second septic tank (treatment tank, aeration tank) 13. Third septic tank (treatment tank) 14. Ozone treatment tank (treatment tank) 15. Wash water storage tank (treatment tank) 25. Wash water supply pipe and (wash water return section) 31 Circulation pump (wash water return section) 33 Air supply device 50 Container body 50a opening 50b Lid placement area (edge ​​of the opening) 51 Lid member 60 buildings 71 Toilet space 72 Tank installation space

Claims

1. A circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet, A multi-stage septic tank for purifying the circulating water discharged from the toilet, an ozone treatment tank for decolorizing the circulating water that has passed through the multi-stage septic tank, and a wash water storage tank for storing the circulating water that has passed through the ozone treatment tank, A flush water return unit that returns the circulating water from the flush water storage tank to the toilet, The building comprises a toilet space in which the toilet bowl is installed, and a tank installation space in which the plurality of treatment tanks are installed. Each of the aforementioned processing tanks is formed in a substantially rectangular parallelepiped shape, In the space for installing the tanks, some of the plurality of treatment tanks are arranged in a first direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows, and the remaining of the plurality of treatment tanks are arranged in a second direction perpendicular to the first direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows. The space for installing the tank is separated from the toilet space by a first partition wall extending in the first direction and a second partition wall extending in the second direction, and is provided to the side of the toilet space. A circulating toilet system in which the outlet of the toilet bowl and the uppermost treatment tank among the multiple treatment tanks are connected by an inlet pipe equipped with a crushing pump for crushing waste.

2. A circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet, A multi-stage septic tank for purifying the circulating water discharged from the toilet, an ozone treatment tank for decolorizing the circulating water that has passed through the multi-stage septic tank, and a wash water storage tank for storing the circulating water that has passed through the ozone treatment tank, A flush water return unit that returns the circulating water from the flush water storage tank to the toilet, The building comprises a space for installing the multiple processing tanks, Each of the aforementioned processing tanks is formed in a substantially rectangular parallelepiped shape, In the space for installing the tanks, some of the plurality of treatment tanks are arranged in a predetermined direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows, and the remaining of the plurality of treatment tanks are arranged in a direction perpendicular to the predetermined direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows. The adjacent septic tanks each have a bolt-shaped connecting pipe with a through hole formed in the axial direction, and a nut-shaped fastening member that is screwed onto the shaft of the connecting pipe. The two side walls of the adjacent septic tanks are sandwiched between the head of the connecting pipe and the clamping member, thereby connecting the adjacent septic tanks. In the aforementioned adjacent septic tanks, when the liquid level in the upstream septic tank rises to the height of the connecting pipe, the treated water that has been overflowed flows through the connecting pipe into the downstream septic tank, thus forming a circulating toilet system.

3. A circulating toilet system that purifies wastewater discharged from a toilet and uses it as flushing water for the toilet, A multi-stage septic tank for purifying the circulating water discharged from the toilet, an ozone treatment tank for decolorizing the circulating water that has passed through the multi-stage septic tank, and a wash water storage tank for storing the circulating water that has passed through the ozone treatment tank, A flush water return unit that returns the circulating water from the flush water storage tank to the toilet, The building comprises a space for installing the multiple processing tanks, Each of the aforementioned processing tanks is formed in a substantially rectangular parallelepiped shape, In the space for installing the tanks, some of the plurality of treatment tanks are arranged in a predetermined direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows, and the remaining of the plurality of treatment tanks are arranged in a direction perpendicular to the predetermined direction such that adjacent treatment tanks are in contact with or close to each other and in the order in which the circulating water flows. The system further includes an air supply device that supplies air below the liquid surface of at least some of the multi-stage septic tanks, thereby making the septic tanks aeration tanks. At least the aeration tank among the multiple-stage septic tanks comprises a container body with an opening formed on its upper side, and a lid member placed on the edge of the opening in the container body so as to close the opening. Furthermore, with the lid member placed on the edge of the opening so as to close the opening, a gap is formed between the upper surface of the edge of the opening and the lower surface of the lid member, without a sealing member, so as to allow water evaporating in the aeration tank to pass through. A circulating toilet system, wherein the space for installing the tank is provided with a humidity reduction unit to reduce the humidity in the space for installing the tank.

4. The space for installing the tank is provided with an air intake port for drawing in air from outside and an exhaust port with a fan for forcibly exhausting air to the outside, as the humidity reduction section. In the space for installing the tanks, the multiple treatment tanks are arranged in the order in which the circulating water flows. The circulating toilet system according to claim 3, wherein in the space for installing the tank, the intake port is located on the downstream side of the washing water storage tank, and the exhaust port is located on the upstream side of the aeration tank.

5. The circulating toilet system according to any one of claims 1 to 4, further comprising a rainwater introduction section for introducing rainwater into the circulating system through which circulating water circulates.

6. The circulating toilet system according to claim 5, wherein the rainwater introduction unit is configured to introduce rainwater into the washing water storage tank when the liquid level in the washing water storage tank falls below a predetermined level.

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