JP4881720B2 - Water reuse system, water reuse method - Google Patents

Description

  The present invention relates to a water treatment technique, and more particularly to a technique for reusing water obtained by treatment of water to be treated.

Conventionally, among wastewater discharged from ordinary households, wastewater with relatively low pollutant concentration, such as bathroom wastewater, washwater wastewater, and laundry wastewater, is purified and the treated water is washed as reused water. There is known a water reuse system that is reused as flush water for toilets, water for car washing, water for watering a garden, etc. (see, for example, Patent Document 1).
JP 2002-242238 A

By the way, when assuming the use of flush toilets in the event of a disaster, even if electricity and water supply are stopped, a water reuse system that can quickly supply flush water to flush toilets afterwards. There is a high demand for construction.
Therefore, the present invention has been made in view of such points, and in a water reuse system that reuses water obtained by treatment of water to be treated, the treated water is reused at the time of unsteady operation. It is an object to provide a technology that is effective for prompt supply.

  The present invention is configured to solve the above problems. In addition, this invention is used suitably for the technique which processes and reuses various to-be-processed waters, such as rain water, including the domestic waste water discharged | emitted from a general household.

  The water reuse system according to the present invention is a system for reusing water obtained by treatment of water to be treated, and includes at least a purification treatment unit, a storage unit, and a transfer unit.

  The purification process part of this invention has the function to perform the purification process of to-be-processed water. The “purification process” here widely includes various purification processes such as a solid-liquid separation process, an anaerobic process, an aerobic process, and a disinfecting process. In addition, the “treated water” here widely includes wastewater discharged from various facilities, rainwater, etc., including domestic wastewater discharged from ordinary households. In addition, the water to be reused may include all or part of the treated water that has undergone a predetermined treatment such as a purification treatment. Depending on the properties of the pollutant concentration, the degree of clarification, etc. It may be water itself. Typically, among the water to be treated, it is preferable to purify and reuse domestic wastewater and rainwater having a relatively low concentration of pollutants such as bathroom wastewater, bathroom wastewater, and laundry wastewater.

  The storage unit of the present invention has a function of storing water after being purified by the purification processing unit. The water stored in the storage unit is transferred by the transfer unit of the present invention to a reuse destination where the water is reused. In particular, the transfer unit of the present invention includes first and second transfer paths that connect a storage unit and a reuse destination, and transfer path switching that enables switching between the first transfer path and the second transfer path. It is set as the structure which has a mechanism. The transfer unit can be configured by appropriately combining piping members, valve members, pumps, connectors, and the like. Further, in this transfer section, the first transfer path is arranged with the inlet corresponding to the first water level in the storage section, while the second transfer path has the inlet of the storage section. Among these, it arrange | positions corresponding to the 2nd water level lower than a 1st water level. The first transfer path and the second transfer path may be completely independent transfer paths between the storage unit and the reuse destination, or may have a configuration in which the transfer paths are partially shared. May be. In the present invention, another transfer path may be added in addition to the first transfer path and the second transfer path.

  In such a configuration, the first transfer mode and the second transfer mode are possible. In the first transfer mode, the first transfer path is used by the transfer path switching mechanism, and thus the water stored in the storage unit is always maintained at least at a location lower than the first water level. Is transferred from the inflow port of the first transfer path to the reuse destination. On the other hand, in the second transfer mode, the second transfer path is used by the transfer path switching mechanism, whereby water stored in the storage unit is sucked from the inlet of the second transfer path to the reuse destination. The transfer mode is set to transfer. The first transfer mode is performed during steady operation such as normal operation, and the second transfer mode is performed during non-steady operation such as a disaster.

  According to such a configuration of the water reuse system according to the present invention, the first transfer mode is performed at the time of steady operation such as normal operation, so that the storage unit can operate regardless of whether the system is operating or stopped. It is reasonable because water can be constantly stored at least at a location lower than the first water level to prepare for unsteady operation such as during a disaster. Then, the second transfer mode is performed during the unsteady operation, and the already-prepared water in the ready state can be quickly supplied to the reuse destination. In addition, the water that is constantly stored in the storage unit during the steady operation is mixed with the water that flows into the storage unit and is always replaced, which is effective in preventing deterioration of water quality due to storage.

  The water reuse system of the further form concerning this invention connects the storage part and the transfer area | region different from a reuse destination further, and the inflow port is arrange | positioned corresponding to a 2nd water level. 3 transfer paths are provided. Sewerage is typically used as the transfer area here. Further, the third transfer path may be a transfer path that is completely independent of the first transfer path and the second transfer path, or may be a part of the first transfer path or the second transfer path. Alternatively, the transfer path may be shared. In such a configuration, in addition to the first transfer mode and the second transfer mode described above, by using a third transfer path, the water stored in the storage section is supplied to the third transfer path. A third transfer mode is possible in which suction from the inflow port and transfer to the transfer area is possible. According to such a configuration, the water stored in the storage unit is accumulated in the storage unit by performing the third transfer mode during periodic maintenance such as inspection, maintenance, repair, etc. of the purification processing unit. It is possible to discharge to the transfer area together with the accumulated sludge and prepare for maintenance work of the purification processing section.

  In the water reuse system of the further form concerning this invention, the said 1st and 2nd transfer path | route is set as the structure which mutually merges in the junction part downstream from a storage part. The transfer path switching mechanism includes a single switching valve and a discharge pump. The single switching valve is disposed at the junction and has a function of connecting one of the first and second transfer paths to the reuse destination. The discharge pump is disposed in a transfer path downstream from the junction and has a function of discharging water to a reuse destination. This discharge pump is typically configured as an electric pump. And by switching operation of a switching valve at the time of operation of a discharge pump, the water of a storage part is transferred to the reuse destination by any one transfer route. According to such a configuration, the transfer path downstream from the merging portion is also used, and one of the first and second transfer paths is used by operating a single switching valve. Therefore, it is possible to simplify the structure of the transfer unit that transfers the water in the storage unit to the reuse destination.

  In the water reuse method according to the present invention, a purification processing unit that performs purification treatment of water to be treated, a storage unit that stores water after purification processing by the purification processing unit, a storage unit, and a reuse destination A first transfer path and a second transfer path connected to each other, and an inlet of the first transfer path is disposed corresponding to the first water level in the reservoir, while the flow of the second transfer path A device is used in which the inlet is disposed corresponding to the second water level that is lower than the first water level in the reservoir.

  In this apparatus, it is possible to perform the first transfer step during steady operation and perform the second transfer step during non-steady operation. In the first transfer step, the first transfer path is used so that the water stored in the storage section is maintained in a state where the storage of water at a location lower than the first water level is always maintained. Inhaled from the route inlet and transferred to the reuse destination. In the second transfer step, the second transfer path is used, and thereby the water stored in the storage unit is sucked from the inlet of the second transfer path and transferred to the reuse destination.

  According to such a reuse method according to the present invention, the first transfer step is performed at the time of steady operation, so that it is at least lower than the first water level in the reservoir regardless of whether the system is operating or stopped. It is reasonable because water can be constantly stored in the place and prepared for unsteady operation. And it becomes possible to perform the 2nd transfer step at the time of unsteady operation, and to supply the processed water promptly to the reuse place. In addition, the water that is constantly stored in the storage unit during the steady operation is mixed with the water that flows into the storage unit and is always replaced, which is effective in preventing deterioration of water quality due to storage.

  In the further water reuse method according to the present invention, in the above-mentioned device, the storage portion and the transfer area different from the reuse destination are connected, and the inflow port is arranged corresponding to the second water level. A third transfer path is provided. Sewerage is typically used as the transfer area here. The third transfer path is used by performing the third transfer step during periodic maintenance such as inspection, maintenance, repair, etc. of the purification processing unit, thereby removing the water stored in the storage unit. The air is sucked from the inlet of the third transfer path and transferred to the transfer area. Thereby, the water stored in the storage unit can be discharged together with the accumulated sludge accumulated in the storage unit to the transfer region to prepare for the maintenance work of the purification processing unit.

  As described above, according to the present invention, in the water reuse system that reuses the water obtained by the treatment of the water to be treated, in particular, regardless of the operation or stoppage of the water reuse system, By adopting a configuration that can always store water, it becomes possible to quickly supply the treated water to the reuse destination during non-steady operation.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, treated water such as domestic wastewater (washing, washing, drainage in bathrooms) and rainwater discharged from general households is treated, and the treated water is reused ("medium water"). Alternatively, it is also referred to as “recycled water”) to explain a water reuse system to be supplied to a reuse destination.

  FIG. 1 shows a schematic configuration of a water reuse system 100 which is an embodiment of a “water reuse system” in the present invention. The water reuse system 100 shown in FIG. 1 treats domestic wastewater discharged from ordinary households, and then uses the treated water as reused water in the toilet wash water tank as the “reuse destination” in the present invention. Configured as a feeding device. In connection with this water reuse system 100, water (water from the water supply) is supplied to each water supply destination for household washing, toilets, toilets, and kitchens. 10 can be supplied (supplemented) to a reused water tank 101 described later. The water supply pipe 10 is provided with an electromagnetic open / close control valve 10a. The open / close operation of the open / close control valve 10a switches between a state in which water is supplied to the reused water tank 101 and a state in which no water is supplied. It is supposed to be configured. The opening / closing control of the opening / closing control valve 10a is performed by the control unit 150 based on the water level detection information by the water level sensor 142 provided in the water storage chamber 140 of the reuse water tank 101 described later.

  The water reuse system 100 according to the present embodiment includes a reuse water tank 101 formed in a tank shape, and accommodates various purification treatment mechanisms described later in the reuse water tank 101. The washing wastewater generated by washing and the washing wastewater generated by the wash surface join the inflow pipe 102 of the reuse water tank 101 together with the bathroom wastewater discharged from the bathroom. In particular, bathroom wastewater and laundry wastewater are relatively abundant amounts of wastewater that allow the user to arbitrarily set the discharge (release) timing. Drainage (hereinafter referred to as “drainage A”) flowing into the reused water tank 101 through the inflow pipe 102 is drainage having a relatively low pollutant concentration. This drainage A usually contains a foam component derived from various cleaning wastewaters. The treated water purified by the purification mechanism in the reused water tank 101 is taken as reused water from a water storage chamber 140, which will be described later, and is reused through a water intake pipe 104, a water supply pump 105, and a water supply pipe 106. Supplied to the wash water tank. Thus, the intake pipe 104, the water supply pump 105, and the water supply pipe 106 constitute means for supplying the stored water stored in the water storage chamber 140 to the reuse destination as reused water. Is configured.

  On the other hand, toilet drainage discharged from a household toilet is discharged into the sewer along with kitchen drainage discharged from a kitchen sink or the like. This wastewater (hereinafter referred to as “drainage B”) is wastewater having a relatively high concentration of pollutants, and is generally difficult to use treated water as reused water. In general, the drainage B has a higher concentration load and a lower water load than the drainage A. Usually, this waste water B contains manure derived from toilet waste water.

  For the configuration of the purification treatment mechanism in the reuse water tank 101, FIG. 2 is referred to. FIG. 2 shows an internal structure of the reuse water tank 101 of the present embodiment. As shown in FIG. 2, the reuse water tank 101 has a contact aeration chamber 110, a sedimentation chamber 120, a disinfection from the upstream side (left side in FIG. 2) corresponding to the processing order as a purification processing mechanism. A chamber 130 and a water storage chamber 140 are provided. These contact aeration chamber 110, sedimentation chamber 120, disinfection chamber 130, and water storage chamber 140 constitute a “purification processing unit” in the present invention.

  The contact aeration chamber 110 has a contact material filling portion 116, and the contact material filling portion 116 is filled with a predetermined amount of contact material C1 to which aerobic microorganisms that aerobically treat (oxidize) organic pollutants adhere. ing. When the water to be treated repeatedly passes through the contact material filling section 116, the organic pollutant in the water to be treated is decomposed and BOD is removed. The contact aeration chamber 110 is provided with a foam separating device 112. In this foam separation device 112, the water to be treated is bubbled by the blower (aeration / foam separation air supplied from 111 in FIG. The foam component contained in the treated water becomes foam, which is discharged together with the overflow water to the sewer through the overflow pipe 103. At this time, a part of SS (floating matter) contained in the treated water is also combined. It should be noted that, instead of the contact aeration chamber 110, another processing chamber capable of performing an aerobic process, such as an aeration chamber or a carrier flow chamber having another configuration, can be appropriately employed.

  The sedimentation chamber 120 is provided with an inclined portion 122 whose bottom portion is inclined, and the inclined portion 122 is configured to have an inclined surface such that the contact aeration chamber 110 side is lower (the water depth is deeper). The inclined portion 122 has a function of precipitating and separating SS (floating matter) generated in the contact aeration chamber 110 and transferred to the sedimentation chamber 120 through the advection opening to the bottom of the contact aeration chamber 110. . The water in the sedimentation chamber 120 is transferred to the disinfection chamber 130 after the flow rate is adjusted via, for example, a float type flow rate adjustment device 124.

  The disinfection chamber 130 includes a disinfectant injection device 132. The water flowing from the sedimentation chamber 120 is sterilized by the disinfectant injected from the disinfectant injection device 132, and the water after the disinfection is transferred to the water storage chamber 140.

  The water storage chamber 140 is an area for temporarily storing water before being supplied to the reuse destination, and corresponds to the “reservoir” in the present invention. The water once stored in the water storage chamber 140 is sucked by a water supply pump (water supply pump 105 in FIG. 1) and discharged as reused water to a reuse destination (in FIG. 1, a wash water tank of a flush toilet). . The water level in the water storage chamber 140 is detected by the water level sensor 142 and transmitted to the control unit 150. Based on the detection information, the control unit 150 outputs a control signal to the open / close control valve 10a. Specifically, the control unit 150 controls the open / close control valve 10a to be open when the water level of the water storage chamber 140 detected by the water level sensor 142 is lower than the reference water level, while the water storage chamber detected by the water level sensor 142. When the water level 140 reaches the reference water level, the open / close control valve 10a is controlled to be closed. Thereby, the water level in the water storage chamber 140 can be maintained. The water level sensor 142 has a float-type water level detection structure that operates according to the water level of the water storage chamber 140, and instead of the opening / closing control valve 10a, the water supply pipe 10 is mechanically interlocked with the float. It is also possible to use an opening / closing valve that performs the opening / closing operation.

  The present embodiment is characterized by the structure of the water storage chamber 140 side in the intake pipe 104 configured as described above. As shown in FIG. 2, the water storage chamber 140 is provided with two water absorption pipes (a first water absorption pipe 144 and a second water absorption pipe 146) capable of absorbing the stored water. The first water absorption pipe 144 and the second water absorption pipe 146 are configured to merge with each other at a merge section 140 a downstream from the water storage chamber 140. The inlet of the first water intake pipe 144 is disposed corresponding to the first water level L1 of the water storage chamber 140, while the inlet of the second water intake pipe 146 is lower than the first water level L1. It is arranged corresponding to the second water level L2. Here, the first water level L1 corresponds to the “first water level” in the present invention, and the second water level L2 corresponds to the “second water level” in the present invention.

  The junction 140a is provided with a single switching valve 148 that connects any one of the first water absorption pipe 144 and the second water absorption pipe 146 to the reuse destination. As the switching valve 148, a three-way valve can be typically used. In the switching operation of the switching valve 148, it is possible to switch between the state using the first water absorption pipe 144 and the state using the second water absorption pipe 146 by one operation of the three-way valve. The switching valve 148 may be configured to be manually operated by an operator, or may be configured to be automatically operated by the control unit 150. It is preferable to provide display means (for example, a label or the like) for displaying whether the switching valve 148 is set in a steady operation state or an unsteady operation state. The switching valve 148 here corresponds to a “switching valve” in the present invention, and constitutes a “transfer path switching mechanism” in the present invention.

  According to such a configuration, the first transfer mode (also referred to as “first transfer step”) and the second transfer mode (also referred to as “second transfer step”) are formed by switching the switching valve 148. Is done. With regard to these transfer modes, reference is made to FIGS.

  FIG. 3 shows a first transfer mode in the reuse water tank 101 in FIG. As shown in FIG. 3, in a steady operation such as a normal operation, the first water intake pipe 144 is used by switching the switching valve 148 to the first transfer mode. In the first transfer mode, the water stored in the water storage chamber 140 is absorbed by the first water absorption pipe 144 in a state in which the water storage in the water storage chamber 140 is always maintained at least at a location lower than the first water level L1. Then, it is transferred to the flush water tank of the toilet that is the reuse destination through the water intake pipe 104, the water supply pump 105, and the water supply pipe 106. At this time, the water stored in a place higher or lower than the first water level L1 of the water storage chamber 140 can be absorbed by the first water absorption pipe 144 in a state where the water is appropriately mixed. In this embodiment, since there is no member or the like that separates the upper side and the lower side in the water storage chamber 140, the water that is always stored in the water storage chamber 140 during this steady operation flows into the water storage chamber 140 from the upstream side. It is always mixed with the incoming water. The path from the first water absorption pipe 144 to the washing water tank here corresponds to the “first transfer path” in the present invention.

  On the other hand, FIG. 4 shows the second transfer mode in the reuse water tank 101 in FIG. As shown in FIG. 4, the second water intake pipe 146 is used by switching the switching valve 148 to the second transfer mode at the time of unsteady operation such as a disaster or emergency. In this second transfer mode, the water stored in the water storage chamber 140 is absorbed by the second water intake pipe 146 and passed through the water intake pipe 104, the water supply pump 105, and the water supply pipe 106 to the wash water tank of the toilet that is the reuse destination. Be transported. At this time, water stored in a place higher or lower than the second water level L2 of the water storage chamber 140 can be absorbed by the second water absorption pipe 146 in a state where the water is mixed appropriately. The path from the second water absorption pipe 146 to the washing water tank here corresponds to the “second transfer path” in the present invention.

  It should be noted that, in the event of a disaster, the restoration of electricity is usually the earliest compared to water and gas, so that if electricity is restored, the water supply pump 105 is operated in the second transfer mode, so that the water is shut off. However, it is possible to use a flush toilet. In addition, after the water supply that has been temporarily shut down in the event of a disaster or the like is restored, the switching valve 148 should be quickly switched to the first water intake pipe 144 side to switch to the first transfer mode in order to switch back to the first transfer mode. preferable.

  As described above, according to the water reuse system 100 of the present embodiment or the water reuse method using the water reuse system 100, the first transfer mode (first transfer step) is performed during steady operation. This is reasonable because it is possible to always store water in the reservoir 140 at least at a location lower than the first water level L1 in preparation for unsteady operation regardless of whether the system is operating or stopped. is there. In addition, the second transfer mode (second transfer step) is performed during the unsteady operation, and the treated water can be quickly supplied to the reuse destination. In addition, the water that is constantly stored in the water storage chamber 140 during steady operation is mixed with the water that flows into the water storage chamber 140 from the upstream side, and is constantly replaced, which is effective in preventing deterioration of water quality due to storage. It is said.

  Further, according to the water reuse system 100 of the present embodiment, the transfer path downstream of the joining portion 140a of the first water suction pipe 144 and the second water suction pipe 146 is shared, and the single switching valve 148 is provided. Since one of the transfer paths of the first water absorption pipe 144 and the second water absorption pipe 146 can be used by the operation, the transfer structure for transferring the water in the water storage chamber 140 to the reuse destination is simplified. It becomes possible. In addition, by setting the switching valve 148 as a three-way valve, it is possible to switch between a state using the first water absorption pipe 144 and a state using the second water absorption pipe 146 by one operation of the three-way valve. This is effective in preventing an erroneous operation such as closing all the transfer paths. Although disasters occur when they are not anticipated, by adopting such a simple switching method, it is possible to continue operation without worrying about the equipment during normal operation and to act only after an actual disaster has occurred. There is an effect.

[Other Embodiments]
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above-described embodiment, the transfer path downstream of the merging portion 140a of the first water absorption pipe 144 and the second water absorption pipe 146 is shared, and the transfer is performed using the single switching valve 148 disposed in the merging section 140a. Although the case of switching the path has been described, a switching valve may be provided in each transfer path, and the transfer path may be switched by operating two switching valves. Further, in the present invention, each transfer path is made a completely independent transfer path, a pump is provided in each transfer path, the pump of one transfer path is operated, and the pump of the other transfer path is stopped to transfer You may make it switch a path | route. In the present invention, in addition to the first water absorption tube 144 and the second water absorption tube 146, another water absorption tube may be added.

Moreover, the reuse water tank of another embodiment different from the reuse water tank 101 of the said embodiment can also be employ | adopted. Here, the internal structure of the reuse water tank 201 of another embodiment is shown in FIG.
The reuse water tank 201 shown in FIG. 5 has a configuration similar to that of the reuse water tank 101, and further includes a merge pipe in which the first water absorption pipe 144 and the second water absorption pipe 146 merge at the merge section 140a than the merge section 140a. In the downstream branch part 140b, it has the structure branched to a reuse destination (wash water tank of a toilet) and a sewer. The branch portion 140b is provided with a single switching valve 149 that connects the downstream of the junction portion 140a to one of the reuse destination and the sewerage transfer path. As the switching valve 149, a three-way valve can be typically used. The switching operation of the switching valve 149 is performed after the switching valve 148 is switched to a state where the second water suction pipe 146 is used. In the switching operation of the switching valve 149, the water sucked from the second water suction pipe 146 is transferred to the reuse destination by one operation of the three-way valve, and the water sucked from the second water suction pipe 146 is sent to the sewer. It is possible to switch to either one of the states to be transferred. The switching valve 149 may be configured to be manually operated by an operator, or may be configured to be automatically operated by the control unit 150. It is preferable to provide display means (for example, a label or the like) for displaying whether the switching valve 149 is set in a state of being transferred to a reuse destination or in a state of being transferred to a sewer.

  According to such a configuration, by switching the switching valves 148 and 149, in addition to the first transfer mode (first transfer step) and the second transfer mode (second transfer step) described above, the third transfer mode is further increased. The transfer mode (also referred to as “third transfer step”) is formed. FIG. 6 shows a third transfer mode in the reuse water tank 201 in FIG. As shown in FIG. 6, during periodic maintenance such as inspection, maintenance, repair, etc. in the reused water tank 201, the switching valve 148 is switched to the second water intake pipe 146 side, and the switching valve 148 is moved to the sewer side. A switched third transfer mode is used. In the third transfer mode, the water stored in the water storage chamber 140 is absorbed by the second water intake pipe 146 together with the accumulated sludge accumulated in the water storage chamber 140 and discharged to the sewer, to prepare for maintenance work. Is possible. At this time, water stored in a place higher or lower than the second water level L2 of the water storage chamber 140 can be absorbed by the second water absorption pipe 146 in a state where the water is mixed appropriately. The path from the second water intake pipe 146 here to the sewer corresponds to the “third transfer path” in the present invention. In this case, the water absorption may be performed using the pump action of the feed water pump 105 or may be configured using the pump action of a pump different from the feed water pump 105. . The third transfer path here is completely different from the first transfer path from the first water absorption pipe 144 to the reuse destination and the second transfer path from the second water absorption pipe 146 to the reuse destination. Independent transfer paths may be used, or the transfer path may be partially shared with the first transfer path and the second transfer path.

  In addition, the present invention can be applied to water treatment technology that reuses various types of water such as rainwater as well as domestic wastewater discharged from ordinary households. Further, in the present invention, domestic wastewater and rainwater may be reused not only as washing water for flush toilets, but also as water for car washing or watering for gardens, for example.

It is a figure which shows schematic structure of the water reuse system 100 which is one Embodiment of the "water reuse system" in this invention. It is a figure which shows the internal structure of the reuse water tank 101 of this Embodiment. It is a figure which shows the 1st transfer mode in the reuse water tank 101 in FIG. It is a figure which shows the 2nd transfer mode in the reuse water tank 101 in FIG. It is a figure which shows the internal structure of the reuse water tank 201 of another embodiment. It is a figure which shows the 3rd transfer mode in the reuse water tank 201 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Water supply pipe 10a ... Open / close control valve 100 ... Water reuse system 101, 201 ... Reuse water tank 102 ... Inflow pipe 103 ... Overflow pipe 104 ... Water intake pipe 105 ... Water supply pump 106 ... Water supply pipe 110 ... Contact aeration chamber DESCRIPTION OF SYMBOLS 112 ... Foam separator 114 ... Air diffuser 116 ... Contact material filling part 120 ... Sedimentation chamber 122 ... Inclination part 124 ... Flow control device 130 ... Disinfection chamber 132 ... Disinfectant injection apparatus 140 ... Water storage chamber 140a ... Confluence part 140b ... Branch part 142 ... Water level sensor 144 ... First water absorption pipe 146 ... Second water absorption pipe 148, 149 ... Switching valve 150 ... Control unit

Claims (5)

A water reuse system that reuses water obtained by treatment of water to be treated,
A purification treatment section for purifying the treated water;
A storage unit for storing water after being purified by the purification unit;
A transfer unit that transfers the water stored in the storage unit to a reuse destination where the water is reused;
With
The transfer unit includes a first and second transfer path that connects the storage unit and the reuse destination, and a transfer path switching mechanism that enables switching between the first transfer path and the second transfer path. The first transfer path has an inlet corresponding to the first water level of the reservoir, while the second transfer path has an inlet of the reservoir. Among them, it is a configuration arranged corresponding to the second water level that is lower than the first water level,
The first transfer path is used by the transfer path switching mechanism, whereby the water stored in the storage unit is re-recovered in the state where the storage of water at a lower position than the first water level is always maintained. A first transfer mode for transferring to the user;
Water having the second transfer mode in which the second transfer path is used by the transfer path switching mechanism and thereby the water stored in the storage unit is transferred to the reuse destination. Reuse system. The water reuse system according to claim 1,
Further, the third storage path is connected to the storage area and a transfer area different from the reuse destination, and the inlet is provided corresponding to the second water level. A water reuse system having a third transfer mode in which water stored in the storage unit is transferred to the transfer region by using a transfer path. The water reuse system according to claim 1 or 2,
The first and second transfer paths are configured to merge with each other at a merging section downstream from the storage section,
The transfer path switching mechanism includes a single switching valve that is disposed in the merging portion and connects one of the first and second transfer paths to the reuse destination, and the merging A discharge pump that is disposed in a transfer path downstream of the unit and discharges water to the reuse destination, and the switching operation of the single switching valve is performed during operation of the discharge pump. A water reuse system characterized in that the water in the reservoir is transferred to the reuse destination through one of the transfer paths. A water reuse method for reusing water obtained by treatment of water to be treated,
A purification processing unit that performs a purification process of water to be treated, a storage unit that stores water after being purified by the purification processing unit, and a first and a second that connect the storage unit and the reuse destination A transfer path, and an inlet of the first transfer path is disposed corresponding to a first water level in the reservoir, while an inlet of the second transfer path is In the apparatus disposed corresponding to the second water level that is lower than the first water level in the reservoir,
At the time of steady operation, the water stored in the storage part is used for the reuse destination in a state where the first transfer path is used and thereby the storage of the water at a location lower than the first water level is always maintained. A first transfer step to transfer;
A water reuse method characterized by comprising a second transfer step of using the second transfer path during unsteady operation and thereby transferring the water stored in the storage part to the reuse destination. The water recycling method according to claim 4,
Furthermore, while connecting the said storage part and the transfer area | region different from the said reuse destination, the 3rd transfer path by which the inflow port is arrange | positioned corresponding to the said 2nd water level is provided,
A water recycling method comprising a third transfer step of using the third transfer path during maintenance and thereby transferring the water stored in the storage unit to the transfer region.

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