JP2010106605A - Rainwater utilizing system and rainwater utilizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote the utilization of rainwater to substantially reduce an amount of the use of clean water supplied as city water so as to improve a living environment, and also to contribute to global environment preservation. <P>SOLUTION: A rainwater utilizing system is characterized by including: a water collecting unit which collects rainwater falling on a house; a rainwater purifying unit which purifies the rainwater collected by the water collecting unit to produce clean water and reclaimed water; a clean water/reclaimed water reserving tank which reserves clean water and reclaimed water purified by the rainwater purifying unit; a first water supply unit which supplies clean water and reclaimed water reserved in the clean water/reclaimed water reserving tank to a first water utilizing facility 140 in the house; a discharged water purifying unit which purifies the discharged water from the water utilizing facility to produce the reclaimed water; a reclaimed water reserving unit which reserves the reclaimed water purified by the discharge water purifying unit; a second water supply unit which supplies the reclaimed water reserved in the reclaimed water reserving tank to a second water utilizing facility 170 in the house; and a drain facility which drains the drainage water from the second water utilizing facility 170 to a sewer system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rainwater utilization system that utilizes rainwater as domestic water.

  Currently, most domestic households use domestic water (tap water) for domestic use. The quality of water is strictly controlled by the government so that it is safe even if it is taken orally, and it is supplied to each household after being purified by the water purification plant.

  However, the water quality that is essentially required in general households varies, and typical examples include toilet flushing water for lavatory toilets, landscape water (ponds and fountain water), watering (water for planting), Water quality is not as good as oral water. On the other hand, use of tap water for drinking or oral water is less than 10% of the total usage, and the remaining 90% or more is used for bathing, washing, flush toilets, and the like. Therefore, in these methods of use, excessive quality water is used, and it can be said that the energy and cost concerning water are wasted. Nonetheless, most of the rain and snow that falls on the roofs of houses are released into the sewer pipes through the gutters and are not used in most cases.

  Conventionally, it has been proposed and practiced to use rainwater as medium water (miscellaneous water) for these purposes. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2002-054187) proposes a rainwater utilization system that stores rainwater and uses it for baths, laundry, toilets, and the like. In particular, Patent Document 1 discloses a configuration in which drinking water is automatically supplied to a rainwater piping system when it is difficult to cover domestic water with only rainwater.

  Patent Document 2 (Japanese Patent Laid-Open No. 10-337557) discloses a technique for purifying wastewater once used and reusing it as intermediate water. Patent Document 2 proposes a circulation and utilization device for rainwater and middle water that keeps the amount of water in a rainwater storage tank constant by recirculating and reusing semi-permanently while draining water and replenishing clean water. Yes.

On the other hand, in recent years, urban paving has progressed, and torrential rains have frequently occurred due to heat islands. However, since the amount of water absorption on the ground has decreased due to pavement, precipitation is concentrated on small and medium rivers, causing flooding and causing local flooding. In Patent Document 3 (Japanese Patent Laid-Open No. 2007-051462), a water storage tank is installed on the road bed of the road, and rainwater is stored to suppress the temperature rise of the road surface due to the heat island phenomenon. A configuration for mitigating flooding is disclosed.
JP 2002-054187 A JP-A-10-337557 JP2007-051462A

  That is, there has been a system that stores rainwater and uses it as middle water (miscellaneous water), and there is also a system that purifies and reuses wastewater.

  However, in the configuration of Patent Document 1, the amount of clean water used is certainly reduced by the use of rainwater, but the rainwater used is directly discharged to the sewer. For this reason, the stored rainwater will be exhausted immediately, and it is necessary to replenish water if rainwater is depleted. If the supply of rainwater is unstable, replenishing clean water cannot be expected to drastically reduce the amount of clean water used, and the use of rainwater is not yet sufficient.

  Moreover, in the structure of patent document 2, it becomes the structure which purifies any drainage in a house and uses it again as middle water. However, some household wastewaters are relatively clean and some are extremely polluted, and purification facilities that can purify any wastewater become large-scale. For this reason, there exists a possibility that purification equipment may become large and installation may become difficult, and the price of purification equipment may also become expensive.

  Moreover, in the structure of patent document 3, although it is one solution as a utilization method of rainwater, rainwater is only used for cooling of a road and cannot reduce the amount of water used in a house.

  Also, if the water supply, which is a lifeline, does not function due to a major earthquake, etc., drinking water must be secured. Currently, drinking water and food are transported from undamaged areas to the stricken area, but it is highly possible that the means of transportation has also become defective at the time of the earthquake. In addition, there are many advantages for urban residents around the world and local government agencies, and there is an urgent need for solutions.

  Therefore, the present invention aims to improve the living environment and contribute to the preservation of the global environment by promoting the use of rainwater and significantly reducing the amount of water supplied as water. .

  As a result of investigations by the inventors, the water quality required for the house varies depending on the use, and the quality of the water drained from the house can also be predicted (expected) depending on the use. Pay attention. In addition, after reviewing the usage of water in the house, in addition to use for drinking and food, baths and washing using water washing power (dissolution power), and flush toilets using water flow and conveyance power We focused on using different properties (functions) of water, such as toilet flushing water. And the use of water can be specified according to water use facilities such as bath facilities and washing facilities, and in view of the difference in water quality required according to the use mode, if only the difference in cleanliness is purified, rainwater can be reused. The present invention was completed by conceiving that it can be used and by further research.

  That is, in order to solve the above-described problems, a typical configuration of the rainwater utilization system according to the present invention includes a water collection unit that collects rainwater that falls on a house, and cleans the rainwater collected by the water collection unit. A rainwater purification unit that generates water, an upper and middle water storage tank that stores the upper and middle water purified by the rainwater purification unit, and a first water supply facility that supplies the upper and middle water stored in the upper and middle water storage tank to the first water use facility of the house A water supply unit, a drainage purification unit that purifies the wastewater of the first water use facility to generate middle water, a middle water storage tank that stores the middle water purified by the drainage purification unit, and middle water stored in the middle water storage tank Is provided with a second water supply unit for supplying the waste water to the second water utilization facility of the house, and a drainage facility for discharging the wastewater of the second water utilization facility to the sewage facility.

  Middle water is water that is positioned between clean water and sewage, and purifies and reuses waste water. The upper and middle water defined in the present invention is water positioned between the upper water and the middle water, and is obtained by purifying rain water.

  According to the above configuration, the rainwater is purified by using the purified water in the first water use facility of the house, purifying the waste water of the first water use facility and using it in the second water use facility. Can be used once. Therefore, rainwater can be used efficiently, and even if the supply of rainwater is unstable, the stored rainwater will not be exhausted immediately. For this reason, it is possible to significantly reduce the amount of clean water used.

  In addition, it can be used as drinking water in the event of an emergency by purifying only rainwater to produce upper and middle water. Thereby, even if the water supply which is a lifeline stops functioning due to a natural disaster such as an earthquake, drinking water can be secured without waiting for relief.

  In addition, by storing rainwater in each house, it can function as a buffer even in the case of heavy rain, and the amount of outflow can be reduced. Therefore, flooding of roads can be prevented and river flooding can be suppressed.

  As a result, it is possible to promote the use of rainwater and greatly reduce the amount of clean water supplied as water supply, thereby improving the living environment and contributing to the conservation of the global environment. .

  In addition, it has a strainer that removes contaminants from the rainwater collected by the water collection unit, and a separation tank that stores the rainwater from which contaminants have been removed and precipitates and separates foreign substances. The rainwater purification unit purifies the supernatant of the separation tank. May be.

  When collecting rain that falls on a house, it is collected from the roof through a gutter. In this case, there is a possibility that fallen leaves and sand are mixed in the rainwater. Therefore, most of the solid foreign matters can be removed by removing foreign substances with a strainer and precipitating and separating foreign matters such as sand in the separation tank. Accordingly, it is possible to easily purify to a predetermined water quality using a filter or the like, extend the life of the filter, and reduce the frequency of maintenance.

  The first water utilization facility may be a bath facility, a laundry facility, or a drinking water facility, and the second water utilization facility may be a toilet facility.

  As described above, only rain water is purified to produce upper and middle water, so it can be used as bath water that touches human skin, and can also be used for washing clothes that touch human skin. It can also be used as drinking water. And since the waste water discharged | emitted from these facilities does not contain manure and does not contain a seasoning and an oil component like a kitchen waste water, it becomes possible to reuse as a middle water by simple purification.

  The rainwater purification unit and the drainage purification unit have a filter that filters foreign matter, and the filter that the drainage purification unit has may have a coarser foreign matter to remove than the filter that the rainwater purification unit has.

  Since upper and middle water may touch the skin or be drunk, a filter for maintaining high water quality is required. On the other hand, there are cases where components such as detergents are dissolved in the waste water from the first water utilization facility. However, in the case of medium water, since the water transport force is used, the component does not require high water quality. Clean. That is, by performing appropriate purification according to the application, purification equipment can be simplified and maintenance costs can be reduced.

  The rainwater purification unit or the drainage purification unit may have a microfiltration membrane.

  The microfiltration membrane is fine-grained and can remove turbidity and purification by removing not only solid foreign substances but also bacteria and chemical molecules. As the microfiltration membrane, for example, a hollow fiber membrane type filtration filter can be used.

  Moreover, the typical structure of the rainwater utilization method concerning this invention consists of the 1st water utilization equipment which uses the water supply equipment which utilizes the water in a house, the water utilization equipment which uses a clean water, and the water and water which purified rainwater. The water is divided into at least a second water use facility that uses the middle water purified from the waste water from the first water use facility, and rainwater is collected and purified to produce upper middle water, and the generated upper middle water is the first Supplying to the water utilization facility, purifying waste water from at least one of the first water utilization facility or the plurality of first water utilization facilities to generate middle water, and using the generated middle water as the second water utilization facility Supplying and discharging the drainage of the second water use facility to the sewage facility.

  The component based on the technical idea of a rainwater utilization system mentioned above and its description are applicable also to the said rainwater utilization method.

  According to the present invention, it is possible to improve the living environment and contribute to the preservation of the global environment by promoting the use of rainwater and greatly reducing the amount of clean water supplied as water.

  DESCRIPTION OF EMBODIMENTS Embodiments of a rainwater utilization system and a rainwater utilization method according to the present invention will be described. FIG. 1 is a diagram illustrating a configuration of a rainwater utilization system according to the present embodiment, FIG. 2 is a diagram illustrating a separation tank, and FIG. 3 is a diagram illustrating examples of a rainwater purification unit and a drainage purification unit. Note that dimensions, materials, and other specific numerical values shown in the following examples are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified.

  The outline of the rainwater utilization system 100 shown in FIG. 1 is to purify rainwater into upper and middle water, use the upper and middle water at the first water utilization facility of the house, purify the drainage into middle water, and use the middle water as the house. Used in the second water utilization facility. That is, the system uses rainwater multiple times. In addition, the water use facility of the house of FIG. 1 uses the water supply facility (for example, normal drinking, cooking / cooking water supply facilities) that uses the tap water as it is, and tap water that has been purified from rainwater. It is divided into the 1st water utilization equipment and the 2nd water utilization equipment which uses the middle water which purified the waste_water | drain from the 1st water utilization equipment at least.

  Here, middle water is a commonly known term, and is positioned between clean water and sewage, and refers to water that purifies and reuses rainwater and wastewater. However, in the present invention, water that does not contain rainwater and purifies wastewater is referred to as middle water. The upper and middle water defined in the present invention is water positioned between the upper water and the middle water, and is obtained by purifying rain water. Since rainwater has several stages of water quality better than river water, it may be used as bath water as it is depending on the region, and can also be used for drinking by appropriately purifying it. Although pool water and hydrophilic water are being expected as drinking water sources in an emergency, upper and middle water, which is purified rainwater, can easily guarantee water quality equivalent to or higher than these.

  The first water utilization facility can be, for example, a bath facility, a laundry facility, or a drinking water facility. That is, in principle, it is not an oral potable water, and it is a facility that may come into contact with water. However, since drinking water is assumed to be used as drinking water in an emergency, the drinking water facility may be used as the first water utilization facility. The second water use facility may be a toilet facility, a watering facility, a landscape facility such as a pond or a fountain. That is, in principle, it is water that does not touch human skin.

  As described above, only rain water is purified to produce upper and middle water, so it can be used as bath water that touches human skin, and can also be used for washing clothes that touch human skin. It can also be used as drinking water. And since the wastewater discharged | emitted from these facilities does not contain manure and does not contain seasonings and oil like kitchen wastewater, it becomes possible to utilize as middle water by simple purification.

  That is, the quality of water used in a house differs depending on the use, and the quality of water discharged from the house can be predicted (expected) depending on the use. In addition, after reviewing the usage of water in the house, in addition to use for drinking and food, baths and washing using water washing power (dissolution power), and flush toilets using water flow and conveyance power It uses different properties (functions) of water, such as toilet flushing water.

  And the use of water can be specified according to water utilization facilities, such as a bath facility and a washing facility, and the degree of required water quality can also be known in connection with this. At the same time, the water quality of the wastewater can be predicted according to the water use facilities, so if only the wastewater from a specific facility is purified slightly, it can be used as middle water, so if only the difference in cleanliness is purified Rainwater can be reused.

  Therefore, upper and middle water is used for bathing, washing, and drinking using water detergency (dissolving power), and middle water is used as toilet flushing water for flush toilets using the fluidity and transport force of water. In this way, rainwater can be used a plurality of times by using different properties (functions) of water in correspondence with the required water quality.

  Referring to FIG. 1, the rainwater utilization system 100 collects rain that has fallen on the roof 104 of the house 102 by rain gutters (eaves 106 and 108) as a water collection unit. The water collected by the water collecting unit is stored in the separation tank 110 and solid foreign substances are separated.

  As shown in FIG. 2, a strainer 112 is provided in front of the separation tank 110 to remove impurities such as fallen leaves from rainwater. The separation tank 110 is a tank that stores rainwater from which contaminants have been removed and precipitates and separates foreign matter, and the supernatant liquid is supplied to the rainwater purification unit 120. In addition, the separation tank 110 includes a rectifying plate 114 for preventing the falling water from rolling up the sediment, a garden watering valve 116, and a mud drain 118 for discharging the sediment.

  When collecting rain that falls on a house, the rain is collected from the roof 104 through a gutter. In this case, there is a possibility that fallen leaves and sand are mixed in the rainwater. Therefore, most of the solid foreign matters can be removed by removing foreign matters by the strainer 112 and precipitating and separating foreign matters such as sand in the separation tank 110. As a result, it is possible to easily purify to a predetermined water quality by using a filter or the like in the purifying unit, extend the life of the filter, and reduce the frequency of maintenance.

  Referring again to FIG. 1, the water from which the solid foreign matter has been removed in the separation tank 110 is purified by the rainwater purification unit 120 to become upper and middle water, and is stored in the upper and middle water storage tank 130. The rainwater purification unit 120 includes biological treatment tanks, filtration devices, membrane separation activated sludge treatment devices, membrane separation devices, activated carbon treatment devices, chemical injection facilities, disinfection tanks, sludge treatment devices, deodorization devices, coagulation treatment tanks, and ozone treatment devices. Etc. can be configured alone or in combination. In particular, a filtration apparatus using a filter having fine pores is inexpensive and has good maintainability, and therefore can be suitably used.

  FIG. 3 is a diagram for explaining a hollow fiber membrane filtration filter that is a microfiltration membrane as an example of a rainwater purification unit. The rainwater purification unit 120 includes a hollow fiber 122 (thin tube) made of a filter material. When the stock solution is passed through the inside of the hollow fiber 122 from the inlet 124 a and the outlet 124 b at both ends, the filtrate is filtered twice on the inner surface and the outer surface of the hollow fiber 122, and the filtered water is discharged from the drain port 126. That is, since the hollow fiber membrane filter can remove fine foreign matters with fine eyes, it can remove not only solid foreign matters but also bacteria and chemical molecules, and can be turbid and purified.

  Further, referring to FIG. 1, the upper and middle water stored in the upper and middle water storage tank 130 is supplied from the first water supply unit 132 as an example of the first water utilization facility 140 such as a bath facility 142, a bathroom facility 144, a laundry facility 146, or It is supplied to drinking water equipment 148. Moreover, it is heated by the water heater 134 and supplied as hot water as necessary. In addition, when supplying to the drinking water equipment 148, it is preferable to purify foreign matters and bacteria through a more precise filtration filter 136.

  The water used in the first water utilization facility 140 is purified by the drainage purification unit 150 to become middle water, and is stored in the middle water storage tank 160. The middle water is supplied by the second water supply unit 162 to a toilet facility 172 as an example of the second water utilization facility 170. The drainage of the toilet facility 172 is discharged to a sewage facility through a water pipe 180 as an example of the drainage facility. In addition, when the middle water storage tank 160 is full, the drainage of the first water use facility 140 may be directly led to the water distribution pipe 180 by switching the valve.

  As the microfiltration membrane used in the rainwater purification section 120, the filtration filter 136, and the drainage purification section 150, in addition to the hollow fiber membrane filtration filter, a general MF membrane (Microfiltlation Membrane) or UF membrane (Ultrafiltration Membrane) is used. : Ultrafiltration membrane) can be used. The MF membrane has a pore size of about 50 nm to 10 μm, and can remove microorganisms, viruses, most spores and spores. The UF filtration membrane has a pore size of approximately 2 nm to 200 nm, and can remove bacteria, viruses, proteins, and the like. These filtration membranes can be formed using, for example, polyethylene or polyolefin.

  Here, the waste water purification unit 150 can be configured by the same mechanism as the rain water purification unit 120, but the water quality required for the middle water is lower than the upper middle water (more impurities are allowed). For this reason, the degree of purification in the drainage purification unit 150 can be set lower than that in the rainwater purification unit 120.

  In other words, the filter that the drainage purification unit 150 has may have a coarser foreign matter to be removed than the filter that the rainwater purification unit 120 has. Since upper and middle water may touch the skin or be drunk, a filter for maintaining high water quality is required. On the other hand, there are cases where components such as detergents are dissolved in the waste water from the first water utilization facility 140, but in order to use the water transport force in middle water, the component does not require high water quality, Simple purification is sufficient. That is, by performing appropriate purification according to the application, purification equipment can be simplified and maintenance costs can be reduced.

  FIG. 4 is a diagram for explaining the relationship between water use and water quality. In FIG. 4, landscape water (middle water), hydrophilic water (middle water), public bath water, bath water, pool water, and upper middle water are listed. The water for landscaping is medium water on the premise that it does not touch human skin, and the water for hydrophilicity is medium water that may touch human skin. Various types of water have chromaticity, turbidity, and BOD (Biochemical oxygen demand: higher the higher the water quality is, the worse the water quality) are determined. On the other hand, toilet toilet flushing water for flush toilets is low in water quality, has no sanitary problems, does not cause discomfort in use, has no problems in facility structure, and has no trouble in maintaining facilities. It is a standard.

  On the other hand, the water quality of the water in the upper and lower waters can be easily achieved by purifying only the rain water as the raw water, which is superior to the public bath water. And if it is used as toilet water for toilet toilet flushing water, it can be used by purifying only the difference in the cleanliness of the drainage of the first water use facility 140 and the second water use facility 170. Rainwater can be reused simply by purifying it.

  FIG. 5 is a diagram illustrating the amount of water used. FIG. 5A shows the amount of water used in a standard family of three people. It can be seen that, on average, 45 L is used for drinking water and cooking, and 575 L is used per day for all others (less than 200 L per person per day).

FIG.5 (b) is the usage-amount of water at the time of applying the rainwater utilization system which concerns on this invention in the standard home of a family of 4-5. 50 L of drinking water (oral water) for drinking water and cooking, 200 L for drinking water (bath, shower, washing, etc.) and 350 L for drinking water (toilet, watering, etc.). Considering that the shortage of middle water 350-200 = 150L with respect to the upper water is covered with the fresh water, the total amount of used water is 50 + 150 = 200L. Since the total amount of water is 50 + 200 + 350 = 600 L, 200/600 = 33.3%. Then, 66.6% of the total consumption of tap water can be actually reduced. Therefore, on average, it can be seen that the amount of clean water used can be reduced by 60 to 70%. Thus, since the rainwater utilization system according to the present invention can be used for the second time as the middle water after using the rainwater as the upper middle water, the amount of the water used can be greatly reduced as compared with the conventional case. Not only can the cost of tap water be reduced, but it is also possible to reduce the energy required to produce tap water and reduce the CO ₂ emissions. In addition, the amount of water 540L of “sewage (drainage)” in FIG. 5B is obtained by adding the amount of water (190L) directly drained from the first water-use facility to the usage amount 350L of middle water.

The capacities of the upper and lower water storage tanks 130 and 160 can be appropriately set depending on the scale of the house. For example, if there are 4 to 5 family members, about 1 m ³ is stored per person, and the total amount is 4 m. It can be ³ to 5 m ³ . As a result, it is possible to store water for 8 to 10 days, assuming 500 L per day.

  As described above, the rainwater is purified by using the upper and middle water purified from the rainwater in the first water use facility 140 of the house, purifying the drainage of the first water use facility 140 and using it in the second water use facility 170. Can be used multiple times. Therefore, rainwater can be used efficiently, and even if the supply of rainwater is unstable, the stored rainwater will not be exhausted immediately. For this reason, it is possible to significantly reduce the amount of clean water used.

  In addition, by purifying only rain water and generating upper and middle water, water quality that can be used as drinking water in an emergency can be obtained even with a simple purification device. Thereby, even if the water supply which is a lifeline stops functioning due to a natural disaster such as an earthquake, drinking water can be secured without waiting for relief.

  In addition, by storing rainwater in each house, it can function as a buffer even in the case of heavy rain, and the amount of outflow can be reduced. Therefore, flooding of roads can be prevented and river flooding can be suppressed.

  As a result, it is possible to promote the use of rainwater and greatly reduce the amount of clean water supplied as water supply, thereby improving the living environment and contributing to the conservation of the global environment. .

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above embodiment, it has been described that all rainwater is used only to generate upper and middle water. However, a part of rainwater is led to the middle water storage tank 160 without passing through the rainwater purification unit 120 and used as middle water. It can also be used.

  INDUSTRIAL APPLICABILITY The present invention can be used as a rainwater utilization system that uses rainwater as domestic water.

It is a figure explaining the structure of the rainwater utilization system concerning embodiment. It is a figure explaining a separation tank. It is a figure explaining the example of a rainwater purification | cleaning part and a waste water purification | cleaning part. It is a figure explaining the relationship between the use of water and water quality. It is a figure explaining the usage-amount of water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Rainwater utilization system 102 ... House 104 ... Roof 106 ... Eaves wall 108 ... 樋 110 ... Separation tank 112 ... Strainer 114 ... Rectification plate 116 ... Garden sprinkling valve 118 ... Waste mud drain 120 ... Rainwater purification part 122 ... Hollow fiber 124a ... Inlet 124b ... Outlet 126 ... Drain outlet 130 ... Upper and middle water storage tank 132 ... First water supply part 134 ... Hot water heater 136 ... Filtration filter 140 ... First water use equipment 142 ... Bath equipment 144 ... Washing equipment 146 ... Laundry equipment 148 ... Drinking water equipment 150 ... Drainage purification part 160 ... Middle water storage tank 162 ... Second water supply part 170 ... Second water use equipment 172 ... Toilet equipment 180 ... Water distribution pipe

Claims (6)

A water collection unit that collects rainwater that falls on the house;
A rainwater purification unit that purifies rainwater collected by the water collection unit and generates upper and middle water;
An upper and middle water storage tank for storing upper and middle water purified by the rainwater purification unit;
A first water supply unit for supplying the upper water stored in the upper water storage tank to the first water use facility of the house;
A waste water purification unit that purifies the waste water of the first water use facility to generate middle water;
A middle water storage tank for storing middle water purified by the waste water purification unit;
A second water supply unit for supplying the intermediate water stored in the intermediate water storage tank to the second water use facility of the house;
A drainage facility for discharging the drainage of the second water use facility to a sewage facility;
A rainwater utilization system characterized by comprising: Furthermore, a strainer that removes impurities from the rainwater collected by the water collection unit,
It is equipped with a separation tank that stores rainwater from which foreign substances have been removed and precipitates and separates foreign substances.
The rainwater use system according to claim 1, wherein the rainwater purification unit purifies the supernatant liquid of the separation tank.   The rainwater utilization system according to claim 1, wherein the first water utilization facility is a bath facility, a laundry facility, or a drinking water facility, and the second water utilization facility is a toilet facility. The rainwater purification unit and the drainage purification unit have a filter for filtering foreign matter,
The rainwater utilization system according to claim 1, wherein the filter included in the drainage purification unit has a coarser foreign matter to be removed than the filter included in the rainwater purification unit.   The rainwater use system according to claim 1, wherein the rainwater purification unit or the drainage purification unit has a microfiltration membrane. The water use facilities in the house are the water use facilities that use the clean water, the first water use facilities that use the clean water that has purified the rainwater, and at least the clean water that has purified the waste water from the first water use facility. It is divided into the second water use equipment to be used,
Collect and purify rainwater to produce water
Supply the generated water to the first water use facility,
Purifying waste water from at least one of the first water use facility or the plurality of first water use facilities to generate middle water;
Supply the generated middle water to the second water use facility,
A method for using rainwater, wherein the drainage of the second water use facility is discharged to a sewage facility.

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