Portable sewage purification system and circulation type flush toilet system

Abstract

Provided are: a portable sewage purification system that is capable of optimizing treatment capacity and adjusting the treatment capacity according to the situation, and with which system operation, maintenance and management are easy to perform; and a circulation type flush toilet system that employs the portable sewage purification system. A portable sewage purification system 1 comprises a crushing and pumping device 10, a sedimentation and separation tank 20, an aeration tank 30, and an ozone treatment tank 40. The sedimentation and separation tank 20, the aeration tank 30, and the ozone treatment tank 40 are each housed independently. Furthermore, the crushing and pumping device 10 and the sedimentation and separation tank 20, the sedimentation and separation tank 20 and the aeration tank 30, and the aeration tank 30 and the ozone treatment tank 40 are connected by sewage hoses 60. As a result, sewage SW pumped from the crushing and pumping device 10 reaches the ozone treatment tank 40 via the sedimentation and separation tank 20 and the aeration tank 30.

Description

Portable sewage purification system and circulating flush toilet system

[0001] The present invention relates to a portable sewage purification system and a circulating flush toilet system using the portable sewage purification system.

[0002] Temporary flush toilets can dispel the traditional impression of temporary toilets with insufficient sanitary environment, and their use in disaster-stricken areas and other places is expanding. However, temporary flush toilets require an unavoidable supply of flushing water, and frequent treatment of stored sewage was necessary. To solve such problems, portable circulating toilet systems have been developed.

[0003] Patent Document 1 proposes a compact and portable circulating toilet system. This circulating toilet system includes a plurality of multi-stage purification tanks for purifying circulating water, an ozone treatment tank for decolorizing the circulating water that has passed through the multi-stage purification tanks, a plurality of treatment tanks including a flushing water storage tank for storing the circulating water that has passed through the ozone treatment tank, a flushing water return unit for returning the circulating water from the flushing water storage tank to the toilet, and a building having a tank installation space in which the plurality of treatment tanks are installed. Each treatment tank is formed in a substantially rectangular parallelepiped shape. In the tank installation space, some of the plurality of treatment tanks are arranged in a predetermined direction in the order in which circulating water flows, with adjacent treatment tanks abutting or approaching each other; the remaining of the plurality of treatment tanks are arranged in a direction orthogonal to the predetermined direction in the order in which circulating water flows, with adjacent treatment tanks abutting or approaching each other.

[0004] Japanese Unexamined Patent Publication No. 2023-123214

[0005] However, in the circulating toilet system proposed in Patent Document 1, the multi-stage purification tanks for purifying circulating water, the ozone treatment tank for decolorizing the circulating water that has passed through the multi-stage purification tanks, and the flushing water storage tank for storing the circulating water that has passed through the ozone treatment tank are all housed in a single building. Therefore, it is difficult to change the treatment capacity according to usage conditions. In addition, the operation and maintenance management of this system is accompanied by difficulties, for example, it is considered that a great deal of labor is required to replace the filter media immersed in each purification tank.

[0006] This invention addresses these problems and provides a portable wastewater treatment system that allows for efficient processing capacity, changes in processing capacity according to the situation, and is easy to operate and maintain, as well as a circulating flush toilet system utilizing this portable wastewater treatment system.

[0007] The first invention to solve the above problems is a portable wastewater purification system comprising: a crushing and pumping device that crushes pollutants and the like that flow out of the toilet bowl along with the flushing water and pumps them as wastewater; a sedimentation and separation tank that settles the solid matter contained in the pumped wastewater and separates the wastewater into solid matter and wastewater containing suspended matter; an aeration tank having an organic matter processing unit that promotes the decomposition of organic matter contained in the wastewater by aerating the wastewater containing suspended matter; and an ozone processing tank that ozones the wastewater treated in the aeration tank, wherein the sedimentation and separation tank, the aeration tank and the ozone processing tank are in separate housings, and the organic matter processing unit comprises an aeration device for blowing air into the wastewater flowing in from the sedimentation and separation tank and a plurality of fiber filter materials suspended at predetermined intervals, wherein the organic matter contained in the wastewater is treated by blowing air into the wastewater from the aeration device while the fiber filter material is immersed in the wastewater.

[0008] In this configuration, the wastewater pumped to the sedimentation tank contains pulverized pollutants discharged from the toilet along with the flushing water. This makes it easier to promote microbial decomposition compared to transporting the pollutants directly to the sedimentation tank. Furthermore, since the sedimentation tank, aeration tank, and ozone treatment tank are each in independent enclosures, each tank can be maintained individually. In addition, the treatment capacity can be easily expanded by using multiple tanks as needed. Moreover, in this configuration, the fibrous filter material is suspended within the aeration tank, allowing for easy replacement and efficient decomposition of organic matter.

[0009] The second invention is a portable wastewater purification system comprising: a crushing and pumping device that crushes pollutants and other substances flowing out of the toilet bowl along with the flushing water and pumps them as wastewater; a sedimentation and separation tank that settles the solid matter contained in the pumped wastewater and separates the wastewater into solid matter and wastewater containing suspended solids; an aeration tank having an organic matter processing unit that promotes the decomposition of organic matter contained in the wastewater by aerating the wastewater containing suspended solids; and an ozone treatment tank that ozones the wastewater treated in the aeration tank, wherein the sedimentation and separation tank and the aeration tank are separate housings, and the ozone treatment tank takes wastewater stored in the upper layer of the aeration tank from its lower end. The invention comprises a first ozone treatment tank, which is an independent enclosure for receiving, storing, and performing ozone treatment, and a plurality of second ozone treatment tanks connected in series via connecting hoses, each of which performs ozone treatment. Each connecting hose connecting adjacent second ozone treatment tanks is connected to the upper end of the second ozone treatment tank located upstream and to the lower end of the second ozone treatment tank located downstream, and the upper end of the first ozone treatment tank and the lower end of the second ozone treatment tank located furthest upstream are connected via connecting pipes.

[0010] With this configuration, the wastewater pumped to the sedimentation tank is in a state where pollutants discharged from the toilet along with the flushing water have been pulverized. Therefore, compared to transferring pollutants directly to the sedimentation tank, it is easier to promote decomposition by microorganisms. Furthermore, since the sedimentation tank, aeration tank, and ozone treatment tank are each in an independent enclosure, each tank can be maintained individually. Moreover, depending on the situation, the treatment capacity can be easily expanded by using multiple tanks. In addition, with this configuration, the ozone treatment tank consists of multiple second ozone treatment tanks connected in series with the first ozone treatment tank, so sufficient contact time between the wastewater and ozone can be ensured, improving the sterilization and decolorization effects. In particular, by connecting the connecting hose from the upper end on the upstream side to the lower end on the downstream side, the wastewater flowing into the lower end tends to remain there due to the difference in specific gravity, but the ozone treatment causes convection and agitation. This equalizes the retention of wastewater in the tank and reliably suppresses the outflow of untreated water (short pass).

[0011] The third invention is the second invention, characterized in that, in the second invention, a plurality of second ozone treatment tanks are housed in the space above the first ozone treatment tank.

[0012] With this configuration, the second ozone treatment tank is housed in the space above the first ozone treatment tank, making it possible to minimize the overall installation area of ​​the equipment while maintaining a high level of processing capacity.

[0013] The fourth invention is characterized in that, in the second and third inventions, the ozone treatment tank is equipped with a discharge tower for discharging the gas discharged from the first ozone treatment tank and the second ozone treatment tank into the outside space.

[0014] With this configuration, the ozone treatment tank is equipped with an exhaust tower, allowing excess gases that did not contribute to the reaction to be safely discharged into the outside space. This improves the working environment and safety around the equipment.

[0015] The fifth invention is a circulating flush toilet system, characterized by comprising: a toilet housing in which a flush toilet bowl is arranged; a flush water tank that supplies flush water to the flush toilet bowl; a portable wastewater purification system according to the first or second invention; and a water supply tank that stores wastewater treated in an ozone treatment tank and returns it to the flush water tank.

[0016] This configuration allows for the easy provision of a circulating flush toilet system using a portable wastewater treatment system.

[0017] This is a schematic diagram of a portable wastewater treatment system. This is a front view of a toilet enclosure with solar panels installed. This is a perspective view showing the framework structure of the solar panels and toilet enclosure. This is a front cross-sectional view of the sedimentation tank. This is a partial cross-sectional view of the aeration tank. This is a partial cross-sectional view of the ozone treatment tank. This is a schematic diagram of a circulating flush toilet system. (a) is a sample of wastewater stored in the aeration tank. (b) is a sample of wastewater stored in the first ozone treatment tank. (c) is a sample of wastewater stored in the second ozone treatment tank located at the upstream end. (d) is a sample of wastewater stored in the second ozone treatment tank located at the downstream end.

[0018] Hereinafter, an embodiment of the portable wastewater treatment system 1 of the present invention will be described in detail with reference to Figures 1 to 6.

[0019] The portable wastewater treatment system 1 described in this embodiment, as shown in Figure 1, includes a crushing and pumping device 10, a sedimentation tank 20, an aeration tank 30, and an ozone treatment tank 40. The sedimentation tank 20, the aeration tank 30, and the ozone treatment tank 40 are each housed in separate enclosures. The crushing and pumping device 10 and the sedimentation tank 20, the sedimentation tank 20 and the aeration tank 30, and the aeration tank 30 and the ozone treatment tank 40 are connected via a wastewater hose 60. As a result, the wastewater SW pumped from the crushing and pumping device 10 reaches the ozone treatment tank 40 via the sedimentation tank 20 and the aeration tank 30.

[0020] The wastewater hose 60 connects the upper end of each tank located on the upstream side to the lower end of each tank located on the downstream side.

[0021] The crushing and pumping device 10 is housed in the toilet enclosure 100. As shown in Figures 2 and 3, the toilet enclosure 100 has a frame member 120 as its framework, and the door 122, inner wall 123, outer wall 124, top plate 121, and bottom plate 127 are fixed to the frame member 120. The top plate 121 forms the roof and has a downward slope toward the opposite side of the door 122 to prevent rainwater from dripping down towards the entrance door 122. Multiple lifting brackets are fixed to the frame member 120 and protrude from the upper surface of the top plate 121. This allows for installation using a crane.

[0022] Columns 125, which form part of the frame members 120, are erected at the four corners of the toilet enclosure 100 and extend below the base plate 127. As a result, when the toilet enclosure 100 is placed on a ground surface, a space is formed between the base plate 127 and the ground surface, allowing the forks of a forklift to be inserted into this space. Therefore, the toilet enclosure 100 can be installed using both a crane and a forklift.

[0023] Inside the toilet enclosure 100, in addition to the crushing and pumping device 10, there is a toilet bowl 51, a flushing water tank 52 that supplies flushing water to the toilet bowl 51, a battery (not shown), an electrical outlet (not shown), and the like. The flushing water stored in the flushing water tank 52 is supplied from the water supply tank 160.

[0024] The solar panel 103 is provided protruding from the upper surface of the top plate 121. The solar panel 103 consists of a support frame 131 fixed to the frame member 120 and protruding from the upper surface of the top plate 121, and a solar panel member 132 attached to the support frame 131, but since it follows a general configuration, the explanation will be omitted.

[0025] The battery stores the electricity generated by the solar panel 103. The electricity stored in the battery is converted to 100V AC by an inverter (not shown).

[0026] The battery supplies electricity to the water pump P and the crushing and pumping device 10 via an inverter. This supplied electricity enables the water in the water supply tank 160 to be supplied to the washing water tank 52 by the water pump P, allowing for continuous washing of the pollutants excreted in the toilet bowl 51. Furthermore, by driving the crushing and pumping device 10, the wastewater SW is pumped to the sedimentation tank 20. Here, wastewater SW is a liquid substance obtained by crushing pollutants together with washing water using the crushing and pumping device 10.

[0027] The power outlet is connected to the battery via an inverter. An electrical control panel (not shown) is also provided to control the battery. Power can be used from the outlet even in emergencies such as natural disasters.

[0028] The water tank 160 consists of a water supply stand (not shown) having lift holes (not shown) into which the forks of a forklift supporting the water container can be inserted, and a water container (not shown) attached to the water supply stand. However, since it follows a general configuration, the explanation will be omitted.

[0029] As shown in Figure 4, the sedimentation tank 20 has a structure in which a sedimentation container 22 is placed on a sedimentation tank stand 21.

[0030] The sedimentation tank stand 21 has lift holes 21a into which the forks of a forklift can be inserted. This allows the sedimentation tank 20 to be installed using both a crane and a forklift. The configuration of the stands and containers of the aeration tank 30 and the ozone treatment tank 40, which will be described later, is almost the same as the configuration of the sedimentation tank 20.

[0031] A drain valve B is provided at the lower end of the side of the sedimentation separation container 22. This makes it possible to completely drain the water accumulated at the bottom when the inside of the sedimentation separation container 22 is washed with water, thereby keeping the sedimentation separation container 22 clean.

[0032] An observation window 25 is provided on the side of the sedimentation and separation container 22, allowing for visual confirmation of the amount of stored wastewater SW and its decomposition state. The observation window 25 is a long, narrow, semi-transparent, strip-shaped slit in the vertical direction. This allows for visual confirmation of the amount of wastewater SW in the sedimentation and separation container 22, as well as the status of scum formation in the wastewater SW. Alternatively, a water level gauge may be used instead of the observation window 25.

[0033] The sedimentation separation container 22 is equipped with a lid 23 on top. This lid 23 is detachable. This allows for work to be carried out, for example, by removing the lid 23 when removing scum.

[0034] As shown in Figure 5, an organic matter processing unit 31 is provided inside the aeration tank 30. The organic matter processing unit 31 has an aeration device 32 for blowing air into the wastewater SW flowing in from the sedimentation tank 20, and a plurality of fibrous filter materials 33. The fibrous filter materials 33 are suspended at predetermined intervals from a plurality of beams 34 provided inside the aeration tank 30. Note that the aeration tank 30 does not have a filtration device installed, which is commonly attached to conventional equipment.

[0035] In this embodiment, the type of fiber filter material 33 is a string-like contact material in which fine fibers are woven in a chenille-like manner around a core string, and the core string at the end of the string-like contact material is fastened to the beam 34. In this embodiment, the PP series (made of polypropylene resin fiber) of BioCode (registered trademark) manufactured by TBR Corporation is used as the fiber filter material 33, but it is not limited to this, and various fiber filter materials 33 can be used.

[0036] The type of fiber constituting the fiber filter material 33 is not particularly limited and may be either synthetic or natural fiber, but synthetic resin fibers made of synthetic resin such as polypropylene are preferably used. By using a fiber filter material 33 made of polypropylene fibers, the filter material is lightweight and has excellent abrasion resistance and chemical resistance, thus reducing the frequency of maintenance.

[0037] As shown in Figures 6(a) and 6(b), the ozone treatment tank 40 has a first ozone treatment tank 41 and six second ozone treatment tanks 45 connected in series by connecting hoses 43. Note that the ozone treatment tank 40 does not have a filtration device, which is generally installed in conventional equipment. In this embodiment, the number of second ozone treatment tanks 45 is set to six, but it is not limited to this. Any number is acceptable, preferably five to eight. These numbers can be appropriately determined considering the ratio of the amount of wastewater that can be contained compared to the first ozone treatment tank 41, the wastewater treatment capacity assumed by the portable wastewater purification system 1, etc.

[0038] The first ozone treatment tank 41 takes in wastewater SW stored in the upper layer of the aeration tank 30 from its lower end and stores it. The wastewater SW stored in the first ozone treatment tank 41 is treated with ozone by ozone OZ generated from the first ozone generator 41a.

[0039] The upper end of the first ozone treatment tank 41 and the lower end of the second ozone treatment tank 45, which is the upstreammost of the six second ozone treatment tanks 45 connected in series, are connected via a connecting pipe 42. The tip of the connecting pipe 42 is located at the upper end of the first ozone treatment tank 41, and the first pump P1 is attached to the tip. By operating the first pump P1, the wastewater SW at the upper end of the first ozone treatment tank 41 flows into the lower end of the second ozone treatment tank 45, which is the upstreammost of the two second ozone treatment tanks 45 connected in series.

[0040] The first ozone treatment tank 41 is fitted with a single-opening top plate 48, and a discharge tower 47 is detachably attached to this top plate 48. By opening and closing the top plate 48, maintenance of the second ozone treatment tank 45, connecting pipes 42, connecting hoses 43, etc. can be easily performed.

[0041] The six second ozone treatment tanks 45 are housed in the upper space UA of the first ozone treatment tank 41, connected in series via connecting hoses 43. Here, the upper space UA is a space located above the first ozone treatment tank 41 that is not immersed in the wastewater SW stored in the first ozone treatment tank 41. The wastewater storage capacity of the first ozone treatment tank 41 is preferably set as large as possible, and more preferably larger than the total wastewater storage capacity of the multiple second ozone treatment tanks 45. This enables stable wastewater treatment in response to load fluctuations and ensures a predetermined level of transparency for the wastewater treated in the downstream second ozone treatment tank 45.

[0042] The sewage SW stored in each second ozone treatment tank 45 is subjected to ozone treatment by ozone OZ generated from the second ozone generator 45a. In this way, by passing the sewage through a plurality of tanks, a sufficient contact time between the sewage and ozone OZ can be secured, and the sterilization and decolorization effects can be improved. In addition, by adopting a configuration in which a connection hose connects the upper end of an upstream tank to the lower end of a downstream tank, the inflowing sewage is convected and stirred by the ozone treatment. Thereby, the retention of sewage in the tank is made uniform, and untreated sewage can be reliably prevented from flowing out as it is.

[0043] The connection hose 43 mutually connects adjacent second ozone treatment tanks 45. Specifically, it connects the upper end of the second ozone treatment tank 45 located on the upstream side to the lower end of the second ozone treatment tank 45 located on the downstream side. Thereby, the sewage SW present at the upper end of the second ozone treatment tank 45 located on the upstream side flows into the lower end of the second ozone treatment tank 45 located on the downstream side via the connection hose 43.

[0044] The mechanism for purifying sewage SW in the portable sewage purification system 1 according to the present embodiment will be described.

[0045] Pollutants and the like excreted into the toilet bowl 51 are washed away by cleaning water, sent to the crushing and pressure-feeding device 10 while being mixed with air, and crushed. At this time, the pollutants are shredded, air becomes fine bubbles, and these are mixed with the cleaning water, and then pressure-fed as sewage SW to the sedimentation separation tank 20.

[0046] In the sewage SW pressure-fed to the sedimentation separation tank 20, solid matter SK precipitates, resulting in sewage SW containing suspended solids SS. The portion containing solid matter SK is in an anaerobic environment, and the sewage SW containing suspended solids SS is considered to be in an environment where aerobic microorganisms can also act. That is, it is considered that a suitable environment is created for facultative anaerobic microorganisms, and at the same time, a suitable environment for aerobic microorganisms is created in the region of the sewage SW.

[0047] Organic substances contained in sewage SW are decomposed into nitrogen compounds and carbon compounds by aerobic microorganisms, and nitrogen gas is produced from the nitrogen compounds by the action of facultative anaerobic microorganisms. That is, in the sedimentation separation tank 20, organic substances contained in the sewage SW are decomposed to a certain extent, and nitrogen gas is produced.

[0048] As a result of field experiments, almost no scum or the like is generated in the sedimentation separation vessel 22, which demonstrates that the decomposition of the sewage SW by microorganisms proceeded smoothly in the sedimentation separation vessel 22.

[0049] The sewage SW treated in the sedimentation separation tank 20 is sent to the aeration tank 30. The sewage SW sent to the aeration tank 30 contains suspended solids SS and organic substances, and part of the organic substances are efficiently decomposed by the organic matter treatment unit 31. The organic matter treatment unit 31 has an air diffuser 32, and air is blown into the sewage SW from the air diffuser 32, thereby creating a suitable environment in which aerobic microorganisms can efficiently decompose organic substances in the sewage SW.

[0050] Among the suspended solids SS contained in the sewage SW sent to the aeration tank 30, those having a size equal to or larger than a predetermined size tend to settle, but are agitated by the air blown from the air diffuser 32. These are captured by the fiber filter medium 33 and decomposed by microorganisms. That is, under predetermined conditions, the suspended solids SS can be efficiently removed without using a filtration membrane.

[0051] The sewage SW treated in the aeration tank 30 is sent to a first ozone treatment tank 41 provided in an ozone treatment tank 40. The sewage SW stored in the first ozone treatment tank 41 is colored, but a certain amount of suspended solids SS has been removed therefrom. When this sewage SW is subjected to ozone treatment, the decomposition of the suspended solids SS is promoted. In addition, remaining suspended solids SS tend to settle at the bottom end portion. As a result, the content of suspended solids SS in the upper end portion is lower than that in the bottom end portion, and relatively small-sized suspended solids SS are present in the upper end portion. That is, by appropriately selecting the amount of ozone to be generated and the amount of sewage SW stored in the first ozone treatment tank 41, the sewage SW existing at the upper end portion can be brought into a state purified to the same extent as the sewage SW obtained by using a filtration device.

[0052] The wastewater SW located at the upper end flows through the connecting pipe 42 into the lower end of the second ozone treatment tank 45, which is located at the uppermost end. By treating this wastewater SW with ozone, the decomposition of suspended solids (SS) is promoted. In addition, any remaining suspended solids (SS) tend to settle at the lower end of the second ozone treatment tank, which is located at the uppermost end. As a result, the upper end has a lower concentration of suspended solids (SS) compared to the lower end. Also, relatively small suspended solids (SS) are present.

[0053] By repeating the above process in multiple tanks, suspended solids (SS) in wastewater (SW) are gradually removed, and decolorization is promoted. In other words, under certain conditions, wastewater (SW) can be purified without using a dedicated filtration device.

[0054] Figure 8(a) shows a sample of wastewater SW stored in the aeration tank 30, (b) shows a sample of wastewater SW stored in the first ozone treatment tank 41, (c) shows a sample of wastewater SW stored in the second ozone treatment tank 45 located at the uppermost end, and (d) shows a sample of wastewater SW stored in the second ozone treatment tank 45 located at the lowermost end. As shown in Figures 8(a) to (d), it can be confirmed that suspended solids (SS) and other substances are removed from the wastewater SW in stages, and its transparency increases in stages. From the collected samples, it was confirmed that the wastewater SW that was finally treated in the ozone treatment tank 40 had no unpleasant odor, was almost transparent, and contained virtually no suspended solids (SS). This demonstrates that the wastewater SW was purified by the mechanism described above.

[0055] The portable wastewater treatment system 1 described in this embodiment can be used to create a circulating flush toilet system 200. Specifically, the wastewater SW treated in the ozone treatment tank 40 can be returned to the water supply tank 160 using the return pump 150. However, it is preferable to set certain standards for several items regarding the quality of the returned wastewater SW. If the standards are not met, measures such as adding chemicals or water may be taken to ensure the desired water quality. Since the amount of wastewater SW returned to the water supply tank 160 increases as the amount of pollutants etc. increases, this circulating flush toilet system 200 can be used continuously without adding water separately.

[0056] Furthermore, if the amount of wastewater SW that can be returned to the water supply tank 160 exceeds the permissible range, a portion of the treated wastewater SW may be discharged to the outside. It is preferable to ensure a predetermined water quality for the wastewater SW discharged to the outside.

[0057] Since the wastewater SW returned to the water supply tank 160 is a liquid containing a large amount of ozone OZ, the toilet bowl 51 can be sterilized by the effect of ozone OZ during the process of washing away pollutants with the flushing water, thus maintaining a hygienic state. Furthermore, since ozone OZ is instantly released into the air as oxygen, it does not adversely affect the microorganisms present in the sedimentation tank 20.

[0058] Furthermore, the present invention is not limited to the embodiments described and can be implemented in various forms.

[0059] This invention provides equipment that can be installed even in locations where external water supply and drainage treatment are difficult. Therefore, it can be used in areas where water and sewage systems have been cut off due to disasters such as earthquakes and floods, in locations where external water supply and drainage treatment are difficult, and in remote areas such as mountainous regions and islands where environmental protection is required and large-scale construction is difficult. Thus, the industrial potential for widespread adoption of the equipment according to this invention is great.

[0060] 1: Portable wastewater treatment system 10: Crushing and pumping device 20: Sedimentation and separation tank 30: Aeration tank 31: Organic matter processing unit 32: Aeration device 33: Fiber filter material 40: Ozone treatment tank 41: First ozone treatment tank 42: Connecting pipe 43: Connecting hose 45: Second ozone treatment tank 47: Discharge tower 51: Toilet bowl 52: Flushing water tank 100: Toilet enclosure 160: Water supply tank 200: Recirculating flush toilet system SK: Solid matter SS: Suspended matter SW: Wastewater UA: Upper space

Claims

1. A portable wastewater purification system comprising: a crushing and pumping device that crushes pollutants and other substances flowing out of the toilet bowl along with flushing water and pumps them as wastewater; a sedimentation and separation tank that settles solid matter contained in the pumped wastewater and separates the wastewater into solid matter and wastewater containing suspended matter; an aeration tank having an organic matter processing unit that promotes the decomposition of organic matter contained in the wastewater by aerating the wastewater containing the suspended matter; and an ozone processing tank that ozone-treats the wastewater treated in the aeration tank, wherein the sedimentation and separation tank, the aeration tank and the ozone processing tank are in separate housings, and the organic matter processing unit comprises an aeration device for blowing air into the wastewater flowing in from the sedimentation and separation tank and a plurality of fiber filter materials suspended at predetermined intervals, wherein the organic matter contained in the wastewater is treated by blowing air into the wastewater from the aeration device while the fiber filter materials are immersed in the wastewater.

2. The system comprises: a crushing and pumping device that crushes pollutants and other substances flowing out of the toilet bowl along with the flushing water and pumps them as wastewater; a sedimentation and separation tank that settles the solid matter contained in the pumped wastewater and separates the wastewater into solid matter and wastewater containing suspended matter; an aeration tank having an organic matter processing section that promotes the decomposition of organic matter contained in the wastewater by aerating the wastewater containing the suspended matter; and an ozone treatment tank that ozone-treats the wastewater treated in the aeration tank, wherein the sedimentation and separation tank and the aeration tank are independent housings, and the ozone treatment tank comprises: a first ozone treatment tank which is an independent housing that takes in and stores wastewater stored in the upper layer of the aeration tank from its lower end and performs ozone treatment, and a plurality of second ozone treatment tanks which are connected in series via connecting hoses and each performs ozone treatment, wherein each connecting hose connecting adjacent second ozone treatment tanks is connected to the upper end of the second ozone treatment tank located upstream and to the lower end of the second ozone treatment tank located downstream. A portable wastewater treatment system characterized in that the upper end of the first ozone treatment tank and the lower end of the second ozone treatment tank, located at the upstream end, are connected via a connecting pipe.

3. The portable wastewater treatment system according to claim 2, characterized in that the plurality of second ozone treatment tanks are housed in the space above the first ozone treatment tank.

4. The portable wastewater treatment system according to claim 2 or 3, characterized in that the ozone treatment tank is equipped with a discharge tower for discharging the gas discharged from the first ozone treatment tank and the second ozone treatment tank into the outside space.

5. A circulating flush toilet system comprising: a toilet housing in which a flush toilet bowl is arranged; a flush water tank that supplies flush water to the flush toilet bowl; a portable wastewater treatment system according to claim 1 or 2; and a water supply tank that stores the wastewater treated in the ozone treatment tank and returns it to the flush water tank.

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