JP5367108B2 - Sewage treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewage treatment technique effective for rationally treating sewage discharged mainly from each residence. <P>SOLUTION: This sewage treatment system is configured to treat sewage discharged from each residence of a residence group by a series of treatments by an anaerobic treatment tank, a biological treatment tank and a treatment water tank of a septic tank 120, and a series of treatments by a sterilization tank and a storage tank, and thereafter to directly discharge the treated sewage from the septic tank 120 to a public water area. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a sewage treatment technique, and more particularly to a construction technique of a sewage treatment system that mainly treats sewage discharged from each house.

  In recent years, the birth rate has been declining in Japan, and the birth rate is declining not only in metropolitan areas but also in rural areas. Specifically, according to the 2005 demographic statistics, the total fertility rate, which represents the number of children a woman is estimated to have in her lifetime, dropped to 1.25, and the survey began in 1899 For the first time since then, the Japanese population has declined naturally (see Figure 6). In rural areas, population decline has become more prominent with the acceleration of migration to metropolitan areas. By the way, in such a natural population decline and social demographic situation, it is expected that the amount of inflow water to collective sewage treatment facilities such as sewers and village effluent treatment facilities will decrease, and the use of such facilities will be reduced. It is assumed that the business management will be affected by a decrease in revenues. Therefore, in the future, by reviewing the system, including the effective use of existing facilities and the consolidation and abolition, etc., it is possible to individually respond to the water quality standards required for the target population scale and the discharge destination water area, and to achieve a highly economical future prospect type. Technology to construct a sewage treatment system is required.

  Then, this invention is made | formed in view of this point, and makes it a subject to provide the sewage treatment technique effective in processing the sewage mainly discharged | emitted from the house of each house rationally.

  The present invention is configured to solve the above problems.

The sewage treatment system according to the present invention includes at least a housing group, a sewage treatment facility, a sewage passage, a septic tank, a first treatment mechanism, a second treatment mechanism, and a discharge passage.
The housing group of this invention is comprised as an aggregate | assembly (community etc.) which consists of a some house. The sewage treatment facility of the present invention is configured as a treatment facility for treating sewage. In this sewage treatment facility, not only the so-called “sewage treatment plant” where final treatment of sewage discharged from each house is performed, but also treatment facilities installed for the purpose of sewage treatment for each small village. Are also included. The sewage flow path of the present invention is configured as a flow path that connects a housing group and a sewage treatment facility. The septic tank of the present invention is configured as a plurality of septic tanks disposed on a sewage flow path. The 1st processing mechanism of the present invention is stored in a septic tank, and is constituted as a processing mechanism which performs biological treatment of sewage in a septic tank. Second processing mechanism of the present invention, in the sewage treatment facility, and a processing mechanism which performs post-processing of the first processing mechanism thus treated wastewater. The discharge channel of the present invention is configured as a channel interposed between the sewage treatment facility and the discharge region.
Furthermore, it is set as the structure which has both the connection form of a 1st connection form and a 2nd connection form on a sewage flow path. The first connection form is a connection form in which a single septic tank is connected to a plurality of houses in the house group. Moreover, the 2nd connection form is made into the connection form with which the single septic tank was connected with respect to the single house of a housing group. In the present invention, in a single-family house, the house is configured as a “single house”, and in an apartment house such as an apartment or an apartment, all households of the apartment house, or each household of the apartment house, Furthermore, a predetermined group household among all households can be configured as a “single house”.

In this configuration, sewage discharged from each house in the housing group is biologically treated by the first treatment mechanism of the septic tank disposed on the sewage flow path, and further treated by the second treatment mechanism of the sewage treatment facility. After that, it is discharged from the sewage treatment facility to the discharge area through the discharge channel. That is, in the sewage treatment system of the present invention, only a part of the series of sewage treatment is performed in the sewage treatment facility, and the pretreatment is transferred to the septic tank upstream from the sewage treatment facility and performed in the septic tank.

  According to such a configuration of the sewage treatment system of the present invention, after using a part of an existing sewage treatment facility, a series of processes until the water discharged from each house and treated with sewage is discharged to the discharge area. It is possible to perform the process. In particular, this sewage treatment system has a configuration in which a part of the sewage treatment capacity of the conventional sewage treatment system is distributed to each septic tank, so the number and size of the septic tanks are appropriately changed according to changes in population and water environment. By doing so, the treatment capacity (treatment performance, treatment ability) of the sewage can be easily changed and is reasonable. In addition, it is possible to reduce the installation work cost by effectively utilizing the existing piping in the sewage flow path and some facilities of the existing sewage treatment facility.

  Moreover, according to such a configuration of the sewage treatment system of the present invention, a highly versatile structure is realized by appropriately selecting the first connection mode or the second connection mode for the installation of a single septic tank. It becomes possible.

  As described above, according to the present invention, it is possible to provide an effective sewage treatment technique for rationally treating sewage discharged from each house.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, this Embodiment demonstrates the sewage treatment system and the sewage treatment method which process the sewage discharged | emitted from the house of each house rationally. One embodiment of the “sewage treatment system” in the present invention and one embodiment of the “sewage treatment method” in the present invention are referred to by FIGS.

(First embodiment)
The schematic configuration of the sewage treatment system 100 of the first embodiment is shown on the right side in FIG.
The sewage treatment system 100 according to the first embodiment includes a housing group composed of a plurality of houses (also referred to as “houses”), and sewage (“life”) discharged from each house (also referred to as “houses”) of the housing group. The drainage pipe 110, which is also referred to as “drainage”, is disposed on the sewer 114 as a bowl-shaped structure interposed on the attachment pipe 110 where the sewage flows into the sewer 114, the sewer 114 where the attachment pipe 110 joins, and the sewer 114. The septic tank 120 provided, the sewage treatment plant 130 disposed in the downstream area of the sewer 114, the discharge pipe 129 interposed between the septic tank 120 and the public water area which is the discharge area, the sewer 114 and the sewage treatment plant 130 The flow path closing means 140 interposed therebetween is mainly configured.

  The sewage treatment plant 130 here is a sewage treatment facility for treating sewage, and corresponds to the “sewage treatment facility” in the present invention. Further, the attachment pipe 110 and the sewer 114 here constitute a sewage channel connecting the housing group and the sewage treatment plant 130, and the sewage channel corresponds to the “sewage channel” in the present invention. The septic tank 120 here corresponds to “one or more septic tanks disposed on the sewage flow path” in the present invention. The discharge pipe 129 corresponds to “a discharge channel interposed between the septic tank and the discharge region” in the present invention.

  In the sewage treatment system 100, sewage discharged from each house flows to the sewer 114 through the attachment pipe 110 and the sewage basin 112 and flows into the septic tank 120 disposed on the sewer 114. In this case, as shown in FIG. 1, the septic tank 120 may be configured as a single septic tank shared by a plurality of houses such as the house A and the house B, the house C and the house D, or the house E It may be configured as a single septic tank dedicated to such a single house. That is, a first connection form in which a single septic tank 120 is connected to a plurality of houses in the housing group, and a second connection form in which a single septic tank 120 is connected to a single house in the housing group. It is possible to employ at least one of the connection forms. In the present embodiment, in a detached house, the house is configured as a “single house”, and in an apartment house such as an apartment or a condominium, all the households of the apartment house or each of the apartment houses Households, or even a predetermined group of all households, can be configured as a “single house”.

  The channel closing means 140 is interposed between the sewer 114 and the sewage treatment plant 130 and has a function of preventing the sewage flowing through the sewer 114 from flowing into the sewage treatment plant 130. As the flow path closing means 140, a closed valve disposed in the sewer 114 and capable of closing the flow path, a pipe dividing structure in which a part of the sewer 114 is cut, or a part of the sewer 114 is removed. A pipe removal structure or the like can be used. Thereby, in the sewage treatment plant 130, the processing mechanisms such as the contaminant removal unit, the anaerobic processing unit, the biological processing unit, and the disinfection processing unit installed in the conventional sewage processing system 100a are put into a dormant state. This flow path closing means 140 is a means for closing the flow path between the sewer 114 and the sewage treatment plant 130. In the present invention, the flow path closing means 140 is “between the sewage flow path and the sewage treatment facility”. It corresponds to “a channel closing means for closing the channel”. According to such a configuration, in each septic tank 120, the sewage discharged from each house is subjected to predetermined sewage treatment described later, and then the treated water is discharged into the public water area through the discharge pipe 129. It will be.

Here, the schematic structure of the septic tank 120 in FIG. 1 is shown in FIG.
As shown in FIG. 2, the septic tank 120 is configured as a tank-like body, and has an inlet 121 connected to the upstream side of the septic tank 120 in the sewer 114 and an outlet 128 connected to the upstream side of the discharge pipe 129. Prepare. The septic tank 120 is equipped with a predetermined purification processing mechanism inside the tank-like body. The purification treatment mechanism includes at least a contaminant removal tank 122, an anaerobic treatment tank 123, a biological treatment tank 124, a treatment water tank 125, a disinfection tank (disinfection chamber) 126, and a storage tank 127.

  A series of treatment elements including the contaminant removal tank 122, the anaerobic treatment tank 123, the biological treatment tank 124, and the treated water tank 125 referred to herein are "first treatment mechanism for performing predetermined sewage treatment in the septic tank" or the present invention. Corresponding to the “first treatment mechanism”, a series of treatment elements by the disinfection tank 126 and the storage tank 127 in the present invention is the “second treatment for performing the post-treatment of the sewage treatment in the first treatment mechanism in the septic tank. It corresponds to “mechanism” or “second processing mechanism”.

In the contaminant removal tank 122, contaminants such as solid matter in the treated water are separated into solid and liquid and removed from the treated water. Although not particularly shown in the anaerobic treatment tank 123, a filter medium to which anaerobic microorganisms for anaerobic treatment (reduction treatment) of organic pollutants in the water to be treated is provided. Organic pollutants in the treated water are anaerobically treated by anaerobic microorganisms. In the biological treatment tank 124, although not shown in particular, a biological treatment region filled with a granular carrier to which aerobic microorganisms for aerobic treatment (oxidation treatment) of organic pollutants in the water to be treated is formed is formed. In this biological treatment tank 124, the water to be treated is aerobically treated by supplying aeration air. In the treated water tank 125, the sedimentation of the solid components is promoted, and the treated water is thereby calmed down. In addition, it is good also as a structure which recirculates a part of to-be-processed water in the treated water tank 125 to upstream treatment tanks, such as the contaminant removal tank 122, by an air lift pump etc., and receives a process from an upstream side again. In the sterilization tank 126, the water to be treated is sterilized. In the storage tank 127, the water to be treated is stored for a while, so that further sedimentation of the solid component is promoted during the storage. The water stored in the storage tank 127 is pressurized by a pump transfer means such as a submersible pump (not shown) and discharged to the discharge pipe 129. In this case, the pump transfer means may be provided in the storage tank 127, or a discharge pump tank in which a discharge pump is accommodated downstream of the purification tank 120 may be provided.
In addition, when the concentration of pollutants in the sewage flowing into the septic tank 120 is relatively low, the configuration of the contaminant removal tank 122, the anaerobic treatment tank 123, etc. is omitted as appropriate, and an aeration tank, a precipitation tank, etc. are appropriately arranged. It is also possible to configure.

  On the other hand, a schematic configuration of a conventional sewage treatment system 100a is shown on the left side in FIG. In the sewage treatment system 100a, sewage discharged from each house flows to the sewer 114 through the attachment pipe 110 and the sewage basin 112, and the sewage treatment plant 130 purifies the purification process corresponding to the septic tank 120. After the treatment mechanism is made, it is discharged into a public water area through a discharge pipe 132 on the sewage treatment plant 130 side. That is, the sewage treatment system 100 of the present embodiment is configured as a sewage treatment system in which all of the sewage treatment functions in the conventional sewage treatment system 100 a are shifted to each septic tank 120 disposed on the sewer 114.

  Therefore, by using the sewage treatment system 100 having the above configuration instead of the conventional sewage treatment system 100a, the water after being discharged from each house and treated for sewage can be used without using the sewage treatment plant 130. It is possible to perform a series of treatments until the water is discharged. In particular, the sewage treatment system 100 has a configuration in which the sewage treatment capacity of the conventional sewage treatment system 100a is divided into small septic tanks 120 and distributed, so the number and size of the septic tanks 120 can be adjusted according to changes in population and water environment. By appropriately changing the length, the treatment capacity (treatment performance, treatment ability) of the sewage can be easily changed and is rational. In addition, it is possible to reduce the installation cost by effectively utilizing the existing piping. As a result, it is possible to construct a sewage treatment system with a high economic efficiency and a future perspective that can individually correspond to the water quality standards for which the target population scale and the discharge destination water area are required.

  In the sewage treatment method using the sewage treatment system 100, the sewage discharged from each house in the housing group is subjected to a series of treatments by the anaerobic treatment tank 123, the biological treatment tank 124 and the treatment water tank 125 of the septic tank 120, and the disinfection tank 126. And after processing by a series of processing elements by the storage tank 127, it discharges from the said septic tank 120 to a public water area directly. Therefore, this sewage treatment method is provided in the present invention by providing "a first treatment mechanism for performing a predetermined sewage treatment on the septic tank and a second treatment mechanism for performing a post-treatment of the sewage treatment in the first treatment mechanism. In addition, after processing the sewage discharged from each house in the housing group by the first and second treatment mechanisms of the septic tank, the septic tank is discharged directly from the septic tank to a predetermined discharge area. Equivalent to.

  In addition, about the process element in the septic tank 120 in the sewage treatment system 100, it is not limited to the form shown in FIG. 2, It can change suitably as needed. For example, instead of or in addition to the treatment elements of the anaerobic treatment tank 123, the biological treatment tank 124, the treated water tank 125, the disinfection tank 126, and the storage tank 127, other treatment elements may be employed. In the present invention, it is possible to construct a treatment element in the septic tank 120 by appropriately combining one or more of treatment elements for performing biological treatment, physical treatment, electrolysis treatment, and chemical treatment (treatment including chemical treatment). It is.

(Second and third embodiments)
The schematic configuration of the sewage treatment system 200 of the second embodiment is shown on the right side in FIG. 3, and the schematic configuration of the sewage treatment system 300 of the third embodiment is shown on the right side in FIG.
The sewage treatment system 200 according to the second embodiment includes a housing group composed of a plurality of houses (also referred to as “houses”), and sewage discharged from each house (also referred to as “houses”) (“domestic wastewater”). Are also disposed on the sewer 114 and the sewer 114 where the mounting pipe 110 joins. The septic tank 220, the sewage treatment plant 130 disposed in the downstream region of the sewer 114, and the discharge pipe 132 interposed between the sewage treatment plant 130 and the public water area as the discharge region are mainly configured.

  The septic tank 220 here corresponds to “one or more septic tanks disposed on the sewage flow path” in the present invention. Further, the discharge pipe 132 corresponds to “a discharge flow path interposed between the sewage treatment facility and the discharge area” in the present invention.

  In this sewage treatment system 200, sewage discharged from each house flows to the sewer 114 through the attachment pipe 110 and the sewage basin 112, and flows into the septic tank 220 disposed on the sewer 114. In this case, as shown in FIG. 3, it may be configured as a single septic tank dedicated to a single house, or may be configured as a single septic tank shared by a plurality of houses. An embodiment in which the septic tank 120 is configured as a single septic tank shared by a plurality of houses is shown in FIG. 4 as the sewage treatment system 300 of the third embodiment. That is, in the sewage treatment system 300 shown in FIG. 4, a first connection form in which a single septic tank 220 is connected to a plurality of houses in a housing group, and a single septic tank 220 in a single house in a housing group. Both the connection forms of the 2nd connection form connected with respect are employ | adopted, and in the sewage treatment system 200 shown in FIG. 3, the 2nd single septic tank 220 is connected with respect to the single house of a housing group. Only the connection form is adopted.

In the sewage treatment plant 130, a disinfection processing unit that performs disinfection processing of water to be treated or a post-treatment mechanism 130b including a discharge unit in which a discharge pump is installed is prepared in a usable state. On the other hand, in the sewage treatment plant 130, pretreatment mechanisms 130a such as a contaminant removal unit, an anaerobic treatment unit, and a biological treatment unit installed in the conventional sewage treatment system 100a as a pretreatment of the disinfection treatment unit are put into a dormant state. The Specifically, a configuration in which water that has flowed into the sewage treatment plant 130 flows to the post-treatment mechanism 130b by bypassing the pre-treatment mechanism 130a can be used.
According to such a configuration, in each septic tank 220, the sewage discharged from each house is subjected to a predetermined sewage treatment, which will be described later, and then sterilized in the post-treatment mechanism 130b of the sewage treatment plant 130, The treated water is discharged to the public water area through the discharge pipe 132.

Here, the schematic structure of the septic tank 220 in FIGS. 3 and 4 is shown in FIG.
As shown in FIG. 5, the septic tank 220 is configured as a tank-like body, and has an inlet 221 connected to the upstream side of the septic tank 220 in the attachment pipe 110 or the sewer system 114, and a downstream side of the septic tank 220 in the sewage system 114. An outlet 228 connected to the outlet. The septic tank 220 has a predetermined purification processing mechanism mounted inside the tank-like body. The purification treatment mechanism includes at least a contaminant removal tank 222, an anaerobic treatment tank 223, a biological treatment tank 224, and a treated water tank 225. Regarding the configurations and functions of these contaminant removal tank 222, anaerobic treatment tank 223, biological treatment tank 224, and treated water tank 225, the contaminant removal tank 122, anaerobic treatment tank 123, and biological treatment tank 124 in the septic tank 120 in FIG. This is the same as the treated water tank 125. The combination of the purification treatment mechanism in the septic tank 220 and the post-treatment mechanism 130b of the sewage treatment plant 130 corresponds to a series of purification treatment mechanisms in the septic tank 120 described above. That is, the sewage treatment systems 200 and 300 according to the present embodiment distribute a part of the sewage treatment function in the conventional sewage treatment system 100a (post-treatment mechanism from the upstream to the treated water tank 125 in the septic tank 120) on the sewer 114. The system is configured as a sewage treatment system that shifts to each installed septic tank 220 and uses the remaining treatment function (post-treatment mechanism downstream of the treatment water tank 125 in the septic tank 120) as the post-treatment mechanism 130b of the sewage treatment plant 130. Has been.

  A series of treatment elements by the contaminant removal tank 222, the anaerobic treatment tank 223, the biological treatment tank 224, and the treated water tank 225 referred to here are “first treatment mechanism for performing a predetermined sewage treatment in the septic tank” or the present invention. The post-treatment mechanism 130b of the sewage treatment plant 130 corresponds to the “first treatment mechanism” and the “second treatment mechanism that performs post-treatment of sewage treatment by the first treatment mechanism in the sewage treatment facility” in the present invention. Or it corresponds to a “second processing mechanism”.

  Therefore, in place of the conventional sewage treatment system 100a, by using the sewage treatment systems 200 and 300 having the above-described configuration, a part of the existing sewage treatment plant 130 is used, and then discharged from each house and subjected to sewage treatment. It becomes possible to perform a series of treatments until the subsequent water is discharged into public water bodies. In particular, the sewage treatment systems 200 and 300 have a configuration in which a part of the sewage treatment capacity in the conventional sewage treatment system 100a is divided into the septic tanks 220 and distributed, so that the septic tanks can be adapted to changes in population and water environment. By appropriately changing the number and size of 220, the treatment capacity (treatment performance, treatment ability) of sewage can be easily changed, which is reasonable. Moreover, the installation work cost can be reduced by effectively utilizing the existing piping and some facilities of the existing sewage treatment plant 130. Therefore, it is possible to construct a future-economic sewage treatment system with high economic efficiency and capable of individually responding to the water quality standards for which the target population scale and the discharge destination water area are required.

  In the sewage treatment method using the sewage treatment systems 200 and 300, sewage discharged from each house in the housing group is treated by the anaerobic treatment tank 223, the biological treatment tank 224, and the treated water tank 225 of the septic tank 220, and further sewage treatment is performed. After being treated by the treatment element of the post-treatment mechanism 130b of the site 130, it is discharged from the sewage treatment plant 130 to the public water area. Therefore, in the present invention, this sewage treatment method is “processing the sewage discharged from each house in the housing group by the first treatment mechanism of the septic tank, and further treating it by the second treatment mechanism of the sewage treatment facility”. After that, it is discharged to the discharge area from the sewage treatment facility ”.

  In the sewage treatment systems 200 and 300, the processing elements on the septic tank 220 side are the contaminant removal tank 222, the anaerobic treatment tank 223, the biological treatment tank 224, and the treated water tank 225, and the sewage treatment plant 130 is disposed on the side of the post-treatment mechanism 130b. In the present invention, the treatment element on the septic tank 220 side is added to the contaminant removal tank 222, the anaerobic treatment tank 223, the biological treatment tank 224, and the treated water tank 225. Further, a disinfection tank (a component corresponding to the disinfection tank 126) may be used, and the processing element on the side of the post-treatment mechanism 130b of the sewage treatment plant 130 may be configured only as a discharge part.

  Further, the processing elements in the septic tank 220 in the sewage treatment systems 200 and 300 and the processing elements of the post-treatment mechanism 130b of the sewage treatment plant 130 can be appropriately changed as necessary. Other processing elements can also be employed. In the present invention, one or a plurality of treatment elements for performing biological treatment, physical treatment, electrolysis treatment, and chemical treatment (treatment including chemical treatment) are appropriately combined to treat the treatment elements in the septic tank 220 or the sewage treatment plant 130. It is possible to construct the processing elements of the post-processing mechanism 130b.

[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 first embodiment, the sewage treatment system 100 in which the entire sewage treatment function in the conventional sewage treatment system 100a is shifted to each septic tank 120 disposed on the sewer 114 is described, and the second and third sewage treatment systems 100 are described. In the embodiment, the sewage treatment system 200, 300 in which a part of the sewage treatment function in the conventional sewage treatment system 100a is shifted to each septic tank 220 disposed on the sewer 114 is described. It is also possible to adopt a further embodiment in which these forms are combined.

  With regard to this further embodiment, the construction of the sewage treatment system 200, 300 is adopted for the house in the area relatively far from the sewage treatment plant 130, with the sewage treatment plant 130 being the most downstream, and relative In addition, the construction of the sewage treatment system 100 can be adopted for a house in an area close to the sewage treatment plant 130. According to such a configuration, it becomes possible to construct a sewage treatment system suitable for the geographical situation of each region.

  Further, as a further embodiment, the septic tank 120 of the first embodiment is used as each septic tank, and the sewage discharged from each house in the housing group is processed by the processing mechanism of the septic tank 120, and then from the septic tank 120. The first use mode that directly discharges to the public water area and the septic tank 220 of the second and third embodiments as each septic tank, and the sewage discharged from each house in the housing group, the septic tank 220 treatment mechanism Then, after the wastewater treatment plant 130 is further treated by the post-treatment mechanism 130b of the sewage treatment plant 130, a treatment method having a second use mode in which the sewage treatment plant 130 is discharged into the public water area can be adopted. The first usage mode here corresponds to the “first usage mode” in the present invention, and the second usage mode here corresponds to the “second usage mode” in the present invention. According to such a sewage treatment method, by appropriately selecting and using the first use mode and the second use mode, the existing piping in the sewage flow path and some equipment of the existing sewage treatment facility can be used. It is possible to realize an effective use of the sewage treatment method. In the present invention, the first use mode and the second use mode only need to have the possibility of use, and the use in either one of the use modes is provisional or permanent as necessary. May be paused.

  Moreover, in the said embodiment, the sewage treatment systems 200 and 300 may be comprised as a temporary sewage treatment system in the process which transfers to the sewage treatment system 100 from the conventional sewage treatment system 100a.

  Moreover, in the said embodiment, although the case where this invention was applied with respect to the sewage treatment system which has the sewage treatment plant 130 in the most downstream of the sewer 114 was described, sewage treatment other than the sewage treatment plant 130 in the most downstream of the sewage 114 The present invention can also be applied to a sewage treatment system having a facility. Examples of the sewage treatment facility other than the sewage treatment plant 130 include treatment facilities installed for the purpose of sewage treatment for each small village.

  Moreover, in this invention, it can be set as the structure which can be restored from the sewage treatment system 100,200,300 of the said structure to the conventional sewage treatment system 100a. Specifically, in the sewage treatment system 100, the flow path closing means 140 is configured by an open / close valve that can open and close the flow path from the sewer 114 to the sewage treatment plant 130, and the sewage treatment plant 130 is not used. When the on-off valve is closed and the sewage treatment plant 130 is used, the on-off valve can be opened. In the sewage treatment systems 200 and 300, an opening / closing valve capable of opening and closing the flow path is provided in a flow path that bypasses the pretreatment mechanism 130a and reaches the posttreatment mechanism 130b. The open / close valve can be opened when using the sewage treatment plant, and the open / close valve can be closed when the entire sewage treatment plant 130 is used. According to such a structure, the restoration to the conventional sewage treatment system 100a is facilitated as necessary.

  Moreover, in the sewage treatment system 100, 200, 300 of the said embodiment, although the case where the domestic wastewater discharged | emitted from each house of the housing group was described was described, in this invention, it is discharged | emitted from each house of the housing group. In addition to the domestic wastewater, it is sufficient to treat wastewater discharged from public facilities such as schools, offices, stores, department stores, and offices. A configuration for processing can be employed. Specifically, after treating the combined wastewater discharged from each house and sewage discharged from each building in the septic tank 120 in FIG. 1, the septic tank 120 directly enters the public water area. 2 and a configuration in which treatment is performed in the septic tank 220 in FIG. 2 and further processing is performed by the processing element of the post-treatment mechanism 130b of the sewage treatment plant 130, and then discharged from the sewage treatment plant 130 to a public water area. Can be adopted. Further, in the sewage treatment system 100, 200, 300 of the present embodiment, it is of course possible to treat rainwater mixed in the system through manholes, side grooves, etc. together with domestic wastewater and sewage discharged from each building. It is. In this case, the treatment system and treatment method for treating domestic wastewater and water (sewage) that is a combination of sewage and rainwater discharged from each building can also be referred to as “sewage treatment system” and “sewage treatment method”. .

It is a figure which shows schematic structure of the sewage treatment system 100 which is 1st Embodiment of the "sewage treatment system" of this invention, and the conventional sewage treatment system 100a. It is a figure which shows schematic structure of the septic tank 120 in FIG. It is a figure which shows schematic structure of the sewage treatment system 200 which is 2nd Embodiment of the "sewage treatment system" of this invention, and the conventional sewage treatment system 100a. It is a figure which shows schematic structure of the sewage treatment system 300 which is 3rd Embodiment of the "sewage treatment system" of this invention, and the conventional sewage treatment system 100a. It is a figure which shows schematic structure of the septic tank 220 in FIG.3 and FIG.4. It is a graph which shows transition of a total fertility rate regarding the vital statistics of Japan.

100, 100a, 200, 300 ... Sewage treatment system 110 ... Mounting pipe 112 ... Sewage tank 114 ... Sewerage 120, 220 ... Septic tank 121, 221 ... Inlet 122, 222 ... Contaminant removal tank 123, 223 ... Anaerobic treatment tank 124, 224 ... Biological treatment tank 125,225 ... Treatment water tank 126 ... Disinfection tank 127 ... Storage tank 128,228 ... Outlet 129 ... Discharge pipe 130 ... Sewage treatment plant 130a ... Pre-treatment mechanism 130b ... Post-treatment mechanism 132 ... Discharge pipe

Claims (1)

A group of houses consisting of multiple houses;
A sewage treatment facility for treating sewage,
A sewage flow path connecting the housing group and the sewage treatment facility;
A plurality of septic tanks disposed on the sewage flow path;
A first treatment mechanism housed in the septic tank and performing biological treatment of sewage in the septic tank;
In the sewage treatment facility, a second processing mechanism for performing post-processing on the thus treated wastewater said first processing mechanism,
A sewage treatment system comprising a discharge channel interposed between the sewage treatment facility and the discharge region,
On the sewage flow path, a first connection mode in which a single septic tank is connected to a plurality of houses in the housing group, and a single septic tank is connected to a single house in the housing group. Having both connection aspects of the second connection aspect;
Sewage discharged from each house in the housing group is processed by the first processing mechanism of the septic tank disposed on the sewage flow path, and further processed by the second processing mechanism of the sewage treatment facility. Then, the wastewater treatment system is configured to be discharged from the sewage treatment facility to the discharge region through the discharge channel.

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