JP4046488B2 - Merged septic tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is from a first casing, which is a single treatment septic tank, in which an aerobic treatment tank for aerobically treating treated water is used, to a second casing, in which an activated sludge treatment tank for treating activated water is treated. It is related with the merged septic tank provided so that to-be-processed water can move freely.
[0002]
[Prior art]
Conventionally, as a septic tank for treating general-purpose domestic wastewater, a single-treatment septic tank that only treats wastewater and urine drainage, and a combined septic tank that can treat not only wastewater to be treated but also sewage wastewater can be used. Yes.
[0003]
In the single treatment septic tank, the wastewater to be treated is only human wastewater, so daily wastewater from the kitchen, laundry, bathroom, etc. is discharged as it is, which is a major cause of water pollution in closed water areas such as lakes and marshes. . It is clear that proper treatment of this domestic wastewater greatly contributes to the reduction of water pollution in closed water areas, and further, wastewater discharged into rivers, etc. due to the strengthening of water quality regulations accompanying the improvement of environmental awareness. A septic tank that improves the quality of water has been desired. Thus, it is considered to use a combined septic tank that can treat not only human wastewater but also daily wastewater from a single treatment septic tank, which makes it possible to satisfy high water quality standards. ing. Furthermore, under such circumstances, measures for realizing the abolition of the new single treatment septic tank and the merger processing of the existing single treatment septic tank are being sought. Examples of cases where an existing single treatment septic tank is to be merged are, for example, shortly after the installation of a single treatment septic tank, or the existing single treatment septic tank is effectively utilized from the area, form, etc. of the land. There are times when it is better to do.
[0004]
As shown in FIG. 4, the septic tank that realizes the combined processing of such existing single-treatment septic tanks performs membrane separation activated sludge treatment that is installed on the ground separately from the existing single-process septic tank and the existing single-process septic tank. There is known one that is connected to a subsequent processing tank so that it can be merged (see JP-A-11-169872).
[0005]
In the septic tank that realizes the combined processing of the existing single processing septic tank, raw water to be treated flows into the sedimentation separation chamber 2 from the inlet 1 and goes downstream in the order of the aeration chamber 3, the sedimentation chamber 4, and the disinfection chamber 5. In the single-treatment septic tank 7 buried underground so as to be decomposed while being transported, a membrane module 8 and an air diffuser 9 installed below the membrane module 8 are provided separately from the single-process septic tank 7. The membrane treatment tank 10 is installed on the ground, the aeration chamber 3 and the membrane treatment tank 10 are communicated with each other by a transfer pipe 12 having a pump 11 for pumping up sewage, and the membrane module 8 and the disinfection tank 5 are connected. The effluent pipe 13 communicated, and the bottom of the membrane treatment tank 10 and the sedimentation separation chamber 2 communicated with an excess sludge return pipe 15 having a valve 14.
[0006]
In such a combined septic tank, miscellaneous wastewater and human wastewater drainage flows from the pipes 16 and 17 into the precipitation separation chamber 2 through the inlet 1, and solid-liquid separation is performed in the precipitation separation chamber 2. The supernatant liquid after solid-liquid separation flows into the aeration chamber 3, and flows into the membrane treatment tank 10 through the transfer pipe 12 by the pump 11. At this time, since the aeration chamber 3 functions as a flow rate adjusting tank for adjusting the flow rate of the supernatant liquid after solid-liquid separation, as in the case where it is used only in the single processing septic tank, It is not necessary to provide an aerobic treatment by providing a contact material in the aeration chamber 3.
The membrane treatment tank 10 incorporates the membrane module 8 and the diffuser tube 9 inside, and the supernatant liquid flowing into the membrane treatment tank 10 from the transfer pipe 12 connected above the membrane treatment tank 10 is: The membrane module 8 performs micron-sized solid-liquid separation, and the treated water separated from the outflow pipe 13 is transferred to the disinfection tank 5. The treated water transferred to the disinfecting tank 5 is sterilized with a chlorine agent and then discharged out of the system from the outlet 6.
The sludge that is not transferred to the disinfection tank 5 by the membrane module 8 is supplied with air from the air diffuser 9 installed below the membrane module 8 and is subjected to aerobic treatment. However, since all the sludge is rarely decomposed by the aerobic treatment, the sludge settled on the bottom of the membrane treatment tank 10 (excess sludge) opens the valve 14 and the surplus sludge return pipe 15 It is transferred to the precipitation separation chamber 2.
[0007]
In this way, simply by installing a membrane treatment tank for membrane separation activated sludge treatment by effectively utilizing the existing single treatment septic tank, the treated water that has been treated with activated sludge and has a sufficiently reduced BOD is efficiently separated into solid and liquid. Can be made into a combined septic tank that can be highly purified, and all domestic wastewater discharged from the household can be efficiently purified and treated so as to meet the water discharge standard value.
[0008]
[Problems to be solved by the invention]
In the conventional merged septic tank described above, the aeration chamber of the existing single processing septic tank is used as a flow rate adjusting tank for the subsequent processing tank. In other words, since the aeration chamber functioning as the flow rate adjusting tank is configured to absorb the peak amount of the inflow treated water concentrated at a specific time in the morning and evening, the water level of the treated water is normally suppressed to the vicinity of the low water level LWL. There is a need. Therefore, most of the aeration chamber space is in an empty state, easily affected by earth pressure around the existing single treatment septic tank buried in the ground, and there is a risk of deformation or breakage of the existing single treatment septic tank. In order to avoid such deformation and breakage of the existing single treatment septic tank, it is conceivable to reinforce the inside of the aeration chamber etc., but the reinforcement work in the existing single treatment septic tank is complicated and the reinforcement cost is Because this is an obstacle, it is actually quite difficult to reinforce existing single-treatment septic tanks, and there is still a question of whether they can withstand long-term even if they are reinforced. There was a point.
[0009]
In addition, in the merged septic tank described above, the subsequent processing tank attached to the existing single processing septic tank is installed on the ground or semi-ground in consideration of the construction cost and labor at the time of installation, the burden at the time of maintenance, etc. There are many. Such treatment tanks installed on the ground or semi-ground are mainly formed of plastics such as FRP (glass fiber reinforced plastic) and DCPD (dicyclopentagen). In addition, the treatment tank is applied with a weather-resistant paint on the outer surface of the treatment tank in a warm region, and in a cold region, the treatment tank is subjected to a civil engineering finish such as surrounding the treatment tank with a pile or a block and covering with earth and sand. It was protected from the surrounding environment.
[0010]
However, the above-described plastic processing tank has the following problems.
(A) Even if the weather-resistant paint was applied to the outer surface of the treatment tank, the weather-resistant paint sometimes deteriorated over time (weather-resistant deterioration). When such deterioration occurs, in the case of the processing tank using the FRP, the resin is likely to deteriorate or the glass fiber is exposed, and in the case of the DCPD, the surface is roughened or embrittled. The inconvenience of progressing is likely to occur.
(B) Since creep deformation with time occurs in addition to the weather resistance deterioration, the long-term reliability is lacking (lack of long-term reliability).
(C) There is a risk of damage due to external impact (lack of impact resistance).
(D) Since the frame of the treatment tank is only a few millimeters thick, in winter (especially in cold regions), the influence of outside air may reduce the activity of microorganisms in the treatment tank, Furthermore, there is a possibility that the inside of the processing tank will freeze. (Lack of thermal insulation properties).
[0011]
The above (a) deterioration of weather resistance and (b) lack of long-term reliability can be solved by adopting a stainless steel (sus) structure in the frame of the treatment tank, but in this case as well, (c) The problem of lack of impact resistance and (d) lack of heat insulation properties could not be solved. Further, when the stainless steel structure is used, the manufacturing cost of the treatment tank is expensive.
[0012]
In addition, (d) the problem of lack of heat insulation properties may be to improve the heat insulation properties of the treatment tank by using a heat insulating material such as a foam, but in this case also, the manufacturing cost of the treatment tank is expensive. There was a drawback of becoming. In addition, it is conceivable to protect the treatment tank from the surrounding environment by applying a civil engineering finish as described above, but this has a problem that it takes labor and costs for construction.
[0013]
Accordingly, an object of the present invention is to provide a combined septic tank that can be used as it is, or can be used in a state of simple modification, and has high resistance to the external environment.
[0014]
[Means for Solving the Problems]
    [Configuration 1]
  The characteristic configuration of the present invention to achieve this object is as described in claim 1.
  Water to be treated is transferred from the first casing, which is an independent treatment septic tank, in which an aerobic treatment tank for aerobically treating the water to be treated to a second casing in which an activated sludge treatment tank for treating the treated water is activated. In the merged septic tank that is set up so that it can freely move,
  A household wastewater pipe for allowing household wastewater to flow in is connected to the second casing, and a flow rate adjustment tank for storing the treated water and adjusting the flow rate is provided upstream of the activated sludge treatment tank in the second casing. Set up inIn addition, a contaminant removal tank for removing contaminants is provided upstream of the flow rate adjustment tank.In other words, the aeration of the aerobic treatment tank is stopped, and the effects thereof are as follows.
[0015]
[Operation effect 1]
In other words, since the daily wastewater pipe for allowing the daily wastewater to flow in is connected to the second casing, the daily wastewater that is drained from the kitchen, laundry, bathroom, etc. can be directly flowed into the second casing. it can. Therefore, it is not necessary to adjust the flow rate of the water to be treated in the first casing, which is an existing single treatment purification tank, and the first aerobic treatment tank can be utilized with a member such as a contact material provided. At this time, the first casing, which is an existing single-treatment septic tank, accepts only human wastewater, and the aerobic treatment tank can perform the treatment with the normal water level being a relatively high water level. Therefore, most of the aerobic treatment tank space is almost never emptied, and the water pressure of the water to be treated inside the aerobic treatment tank is kept in an antagonistic state with the earth pressure around the existing single treatment septic tank. Therefore, there is almost no risk of deformation or breakage of the existing single treatment septic tank. Therefore, the existing single treatment septic tank can be used as it is without performing a reinforcement work for increasing the strength of the existing single treatment septic tank. At this time, in general, since the aerobic treatment tank is used in a state where aeration is stopped, the existing single treatment purification tank is used as a precipitation separation tank or an anaerobic treatment tank.
[0016]
And said 1st casing which is an existing single processing septic tank, after exhibiting the function as a sedimentation separation tank that separates solid components in human wastewater by precipitation, the treated water with reduced load is installed in the above-mentioned It can be naturally advected to the second casing.
[0017]
Further, in the second casing, by providing a flow rate adjusting tank for storing the treated water and adjusting the flow rate upstream of the activated sludge treating tank, the inflow load of domestic wastewater directly flowing into the second casing is reduced. It can be buffered, so that the peak amount of the inflow treated water concentrated at a specific time in the morning and evening can be absorbed. Therefore, the activated sludge treatment of the activated sludge treatment tank can be performed stably.
[0018]
In this way, by providing the flow rate adjustment tank that buffers the inflow load of domestic wastewater in the second casing, it is not necessary to adjust the flow rate of the treated water in the existing single treatment septic tank. It can be used as it is. Therefore, the second casing having the above-described configuration is to be used when merging wastewater in a situation where a single treatment septic tank that has at least an aerobic treatment tank for aerobically treating treated water is already installed. Therefore, installation labor and cost can be reduced compared to newly laying a merged septic tank. Further, it is possible to avoid the problem of waste disposal when the existing single treatment septic tank is dug up.
[0019]
  Furthermore, when the second casing having the above-described configuration is connected to the existing single treatment septic tank, it is not necessary to connect with a plurality of pipes such as the transfer pipe, the outflow pipe, and the excess sludge return pipe, so that complicated piping work There is no need to perform installation, and installation labor and cost can be reduced accordingly..
AlsoIn the second casing, it is possible to remove contaminants such as food residues flowing into the second casing by providing a contaminant removal tank for removing contaminants upstream of the flow rate adjustment tank.
  Further, since the contaminant removal tank is provided upstream of the flow rate adjustment tank, the contaminant removal tank is provided upstream of the activated sludge treatment tank. Thereby, impurities hardly flow into the activated sludge treatment tank, and the possibility of adversely affecting the activated sludge treatment in the activated sludge treatment tank is reduced. That is, in the activated sludge treatment tank, the activated sludge treatment proceeds in a state in which solids or the like that are difficult to be aerobically treated due to a large load are difficult to flow into the activated sludge treatment tank. Water treatment capacity can be maintained higher. Therefore, the improvement of the processing efficiency in the said activated sludge processing tank is anticipated.
[0020]
    〔Constitution2]
  In order to achieve this object, the characterizing features of the present invention are as follows.2As described in
  Water to be treated is transferred from the first casing, which is an independent treatment septic tank, in which an aerobic treatment tank for aerobically treating the water to be treated to a second casing in which an activated sludge treatment tank for treating the treated water is activated. In the merged septic tank that is set up so that it can freely move,
  A household wastewater pipe for allowing household wastewater to flow is connected to the first casing, and a flow rate adjustment tank for storing treated water and adjusting the flow rate with respect to the second casing is the activated sludge treatment tank. The waste removal tank for removing the foreign substances is provided upstream of the flow rate adjustment tank, and the operation and effects thereof are as follows.
[0021]
    [Function and effect2]
  In other words, the daily wastewater pipe into which the daily wastewater flows is connected to the first casing, so that the daily wastewater flows into the first casing together with the urine drainage. And the said 1st casing is a contaminant removal tank which carries out the sediment separation of the solid content in a human waste water, the foreign materials, such as toilet paper in a human waste water, and the food residue in a domestic waste water. After exhibiting the function, the water to be treated can be naturally advected to the subsequent second casing. In other words, since the water to be treated that has been subjected to the pretreatment such as the removal of contaminants in the first casing can be activated sludge treatment in the activated sludge treatment tank of the second casing, the load in the activated sludge treatment tank is Since the activated sludge treatment proceeds in a state in which solids such as contaminants that are largely difficult to be aerobic hardly flow in, the water treatment capacity of the activated sludge treatment tank can be maintained higher.
  In addition, the connection of the household wastewater piping to the first casing can be performed only by adding a simple modification such as opening the daily wastewater inlet to the first casing as described in Example 2 described later. .
[0022]
Further, since the second casing is provided with a flow rate adjusting tank for storing the treated water and adjusting the flow rate, the inflow load of the domestic wastewater that has flowed into the first casing is set to the flow rate of the second casing. Since it can be buffered in the adjustment tank, there is no need to adjust the flow rate of the water to be treated in the first casing, which is an existing single treatment purification tank, and a member such as a contact material is provided in the aerobic treatment tank Since the aerobic treatment tank of the existing single treatment septic tank can be used as it is, the treatment can be performed with the normal water level being relatively high. Therefore, most of the aerobic treatment tank space is almost never emptied, and the water pressure of the water to be treated inside the aerobic treatment tank is kept in an antagonistic state with the earth pressure around the existing single treatment septic tank. Therefore, there is almost no risk of deformation or breakage of the existing single processing septic tank. Therefore, the existing single processing septic tank can be used as it is without performing a reinforcement work for increasing the strength of the existing single processing septic tank. At this time, in general, since the aerobic treatment tank is used in a state where aeration is stopped, the existing single treatment purification tank is used as a precipitation separation tank or an anaerobic treatment tank.
[0023]
In addition, since the flow rate adjustment tank is provided upstream of the activated sludge treatment tank, it can absorb the peak amount of the inflow treated water concentrated at a specific time in the morning and evening, so that the activated sludge treatment tank can be activated. Sludge treatment can be performed stably.
[0024]
In this way, by providing the flow rate adjustment tank that buffers the inflow load of domestic wastewater in the second casing, it is not necessary to adjust the flow rate of the treated water in the existing single treatment septic tank. It can be used as it is. Therefore, the second casing having the above-described configuration is to be used when merging wastewater in a situation where a single treatment septic tank that has at least an aerobic treatment tank for aerobically treating treated water is already installed. Therefore, installation labor and cost can be reduced compared to newly laying a merged septic tank. Further, it is possible to avoid the problem of waste disposal when the existing single treatment septic tank is dug up.
[0025]
Furthermore, when the second casing having the above-described configuration is connected to the existing single treatment septic tank, it is not necessary to connect with a plurality of pipes such as the transfer pipe, the outflow pipe, and the excess sludge return pipe, so that complicated piping work There is no need to perform the operation, and installation labor and cost can be reduced accordingly.
[0026]
Further, the cleaning of the tank may be performed mainly for the first casing, and the second casing may be subjected to a process such as sludge extraction only when necessary, so that labor and cost required for cleaning are reduced. Can be reduced.
[0028]
  AndIn the second casing, it is possible to remove contaminants such as food residues flowing into the second casing by providing a contaminant removal tank for removing contaminants upstream of the flow rate adjustment tank.
  Further, since the contaminant removal tank is provided upstream of the flow rate adjustment tank, the contaminant removal tank is provided upstream of the activated sludge treatment tank. Thereby, impurities hardly flow into the activated sludge treatment tank, and the possibility of adversely affecting the activated sludge treatment in the activated sludge treatment tank is reduced. That is, in the activated sludge treatment tank, the activated sludge treatment proceeds in a state in which solids or the like that are difficult to be aerobically treated due to a large load are difficult to flow into the activated sludge treatment tank. Water treatment capacity can be maintained higher. Therefore, the improvement of the processing efficiency in the said activated sludge processing tank is anticipated.
[0029]
    〔Constitution3]
  In order to achieve this object, the characterizing features of the present invention are as follows.3As described above, the above configuration1~2In the merged septic tank described in any one of
  The contaminant removal tank is provided with an advection pipe having an opening at the lower end, and the treated water that brings the contaminant removal tank to a predetermined water level or higher is guided to the upper end of the advection pipe to other than the flow rate adjustment tank. A guide path is provided, and the function and effect thereof are as follows.
[0030]
    [Function and effect3]
  That is, when the water level of the contaminant removal tank and the flow rate adjustment tank is abnormally high, the low-load treated water that has flowed into the tank in large quantities can be transferred to the disinfection tank as it is or stored in the temporary storage tank. It can be done.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.
As shown in FIG. 1, the merged septic tank of the present invention comprises a first casing X1 and a second casing X2 embedded underground, and is covered from the first casing X1 to the second casing X2 via a connecting pipe H1. The treated water is formed so as to be transportable.
[0034]
In the first casing X1, the water to be treated can freely flow through the inlet 1 into which the water to be treated flows, the sedimentation separation chamber 2 that receives the raw water to be treated, the aeration chamber 3, the sedimentation chamber 4, and the disinfection chamber 5 in this order. The human wastewater is advected by overflow. The treated water that has passed through the aeration chamber 3 is precipitated in the sedimentation chamber 4 and treated wastewater that does not contain solid components is transferred to the outside of the first casing X1 through the disinfection chamber 5. The configuration is as follows. As such a first casing X1, an existing single processing septic tank can be applied as it is.
[0035]
In addition, the first casing X1 is not limited to the above-described configuration, but can be applied to a configuration in which the precipitation separation tank is replaced with an anaerobic processing tank as long as it is a human waste treatment tank. It is also possible to apply a configuration such as a complete aeration tank comprising a sedimentation tank and a disinfection tank. These are at least an aerobic treatment tank for aerobic treatment of water to be treated, and a urine single treatment purification tank. At this time, since the aeration to the aeration tank, which is an aerobic treatment tank, is used in a stopped state, the human waste single treatment purification tank is used as a precipitation separation tank or an anaerobic treatment tank.
[0036]
The second casing X2 is provided with a contaminant removal tank N1, a flow rate adjustment tank E1, a membrane separation tank E2, a sludge concentration adjustment tank P, and a disinfection tank Q from the upstream side.
[0037]
The contaminant removal tank N1 receives the water to be treated which has flowed into the second casing, and precipitates from the water to be treated and solids such as scum generated on the liquid surface and impurities such as food residues. The water to be treated is anaerobically treated by anaerobic bacteria that inhabit the inside, and can be transferred to the flow rate adjusting tank E1 via the advection tube F. Since the contaminant removal tank N1 is provided upstream of the membrane separation tank E2 described later, the contaminants hardly flow into the membrane separation tank E2, thereby adversely affecting the activated sludge treatment in the membrane separation tank E2. Is less likely to give Therefore, improvement of the processing efficiency in the membrane separation tank E2 is expected.
The advection pipe F is a advection pipe provided with an opening F1 in the central portion in the width direction of the contaminant removal tank N1, and the water to be treated that has reached the reference water level of the contaminant removal tank N1 is filtered by the filter medium F2. And is configured to flow into the flow rate adjusting tank E1 from the opening F1. In addition, first and second guide paths G1 and G2 for guiding the water to be treated that has reached a predetermined water level slightly above the reference water level to other than the flow rate adjusting tank E1 are provided on the upper part of the advection pipe F. is there.
The first guide path G1 provided in the upper part of the advection pipe F is connected to the sterilization tank Q so as to supply water to be treated to the sterilization tank Q without passing through the membrane separation tank E2. The mechanism is configured. When the water levels of the contaminant removal tank N1 and the flow rate adjusting tank E1 are abnormally high, the low-load treated water that has flowed into the tank in large quantities can be transferred to the disinfection tank Q as it is. The second guide path G2 is connected to a temporary storage tank T provided separately from the first casing X1 and the second casing X2, and the low-load treated water is supplied to the temporary storage tank. T can be stored in T.
[0038]
The flow rate adjustment tank E1 has a flow rate adjustment unit capable of storing the treated water and adjusting the flow rate in the range of LWL to HWL while anaerobically treating the treated water flowing from the contaminant removal tank N1 with denitrifying bacteria. Have. Thereby, it is set as the structure which can buffer the inflow load of to-be-processed water, and can absorb the peak amount of the inflow treated water amount which concentrates on the morning and evening specific time. Therefore, the activated sludge treatment of the membrane separation tank E2 can be performed stably.
The flow rate adjusting tank E1 includes a metering device A1 and a transfer air lift pump A2, and the water to be treated is steadily supplied to the membrane separation tank E2 in accordance with the amount of the membrane to be treated. It is configured to be transferred through the transfer pipe A3.
[0039]
The membrane separation tank E2 includes a membrane separation apparatus M having a large number of flat membranes arranged in parallel, and aerobic bacteria are grown in the membrane separation tank E2. The aerobic bacteria aggregate to form flocs to become activated sludge, which aerobically decomposes organic components of the water to be treated. Below the membrane separator M, bubbles are supplied to the membrane separator M to prevent sludge and the like from adhering to the membrane surface, and a circulation flow is formed in the membrane separator E2. An air diffuser D for supplying oxygen to the aerobic bacteria is incorporated.
Each flat membrane of the membrane separation device M is formed by adhering and forming a filtration membrane member on both surfaces of a resin-made support plate having a to-be-treated water conducting portion on the inside, and communicating with the to-be-treated water conducting portion. A water pipe M1 is provided continuously. The water collecting pipe M1 is connected in communication with a suction pump A4. By operating the suction pump A4 and performing a suction operation, the water to be treated passes through the filtration membrane member of the flat membrane and is treated by the filtration membrane member. The sludge in the water is removed, and the water to be treated, which has been subjected to membrane separation treatment and highly purified in this way, is sent to the sterilization tank Q.
[0040]
The downstream side of the suction pump A4 can be configured to be reusable on the ground via the pumping pipe 101. For example, a roof watering facility as the water supply unit 102 is connected, and is used for melting snow on the roof in winter and for cooling the roof in summer. Moreover, it can be used not only for watering the roof but also for cooling water for air conditioning or washing water for toilets.
[0041]
The sludge concentration adjusting tank P stores sludge contained in the circulating liquid from the membrane separation tank E2, and further transfers the desorbed liquid from the sludge concentration adjusting tank P to the flow rate adjusting tank E1 together with the nitrification liquid. The sludge transfer pipe G3 is arranged.
[0042]
The amount of sludge in the membrane separation tank E2 is preferably in the range of 5000 to 15000 mg / liter in order to maintain an appropriate activated sludge treatment, and the membrane of the flat membrane in the membrane separator M The surface can be kept from being contaminated.
[0043]
As described above, the first casing X1 and the second casing X2 are provided so as to be freely transferred, and the first casing X1 and the second casing X2 are buried underground to form a combined treatment septic tank. In one casing X1, water to be treated can be transferred to the second casing X2 provided later by natural advection without using power from a pump device or the like.
[0044]
In such a combined septic tank, as shown in FIG. 2, it can be set as the structure which flows a miscellaneous wastewater into said 2nd casing X2 from the miscellaneous wastewater piping H2. At this time, the miscellaneous wastewater pipe H2 may be directly connected to the second casing X2 so that the wastewater from the first casing X1 and the miscellaneous wastewater flow into the second casing X2 separately. Even if the connecting pipe H1 that connects the one casing X1 and the second casing X2 is joined (broken line part), the waste water from the first casing X1 and the domestic waste water are collectively flowed into the second casing X2. Good.
[0045]
By providing the household wastewater pipe H2 in this way, it is possible to provide a septic tank that can be merged without modifying the first casing, which is an existing single-process septic tank. At this time, the first casing X1 accepts only human wastewater and exhibits a function as a sedimentation separation tank that separates the solid components in the human wastewater by sedimentation. The second casing X2 can be naturally advected.
[0046]
In the merged septic tank described above, the flow rate adjusting tank E1 is provided in the second casing X2, so that it is not necessary to adjust the flow rate of the water to be treated in the existing single process septic tank. Can be used as is. That is, since the first casing X1 can be utilized in a state where a member such as a contact material is provided in the aeration chamber 3 of the existing single processing septic tank, the aeration chamber 3 has a relatively high water level. The treatment can be carried out with the normal water level. Therefore, most of the space of the aeration chamber 3 is almost never empty, and the water pressure of the water to be treated inside the aeration chamber 3 is kept in an antagonistic state with the earth pressure around the first casing X1. Therefore, there is almost no risk of deformation or breakage of the first casing X1. Therefore, the first casing X1 can utilize the existing single-treatment septic tank as it is without reinforcing work for increasing the strength. At this time, in general, since the aeration to the aeration chamber 3 is stopped, the existing single treatment septic tank is used as a precipitation separation tank or an anaerobic treatment tank.
[0047]
Therefore, in the situation where the single treatment septic tank that houses the aeration chamber 3 that aerobically treats the water to be treated is already installed, the second casing X2 having the above-described configuration is used for the combined treatment of domestic wastewater. Therefore, it is possible to reduce installation labor and cost as compared to newly laying a combined septic tank, and further, the first casing X1 which is an existing singly processed septic tank. The problem of waste disposal when digging up can also be avoided.
[0048]
Further, when the second casing X2 having the above-described configuration is connected to the existing single processing septic tank, it is necessary to connect with a plurality of pipes such as the transfer pipe 12, the outflow pipe 13, and the excess sludge return pipe 15 in FIG. Since there is no need for complicated piping work, installation labor and cost can be reduced accordingly.
[0049]
Further, since the second casing X2 is buried in the ground, the second casing X2 is not directly exposed to the outside air. As a result, there is almost no risk of the weather resistance deterioration, and since the soil around the second casing X2 supports and disperses the load of the second casing X2, creep deformation hardly occurs, and thus long-term reliability is ensured. The casing can be provided, and there is almost no risk of damage to the casing due to external impact.
[0050]
Furthermore, since the second casing X2 is buried in the ground, it is difficult to be affected by the outside air temperature in the winter in a cold region. Therefore, since there is almost no possibility that the water to be treated in the second casing X2 will freeze, it is possible to prevent the activated sludge treatment and membrane separation treatment of the water to be treated from being performed, and the inside of the second casing X2 due to the influence of outside air. Since there is less possibility that the activity of the microorganisms in the membrane separation tank E2 is reduced, it is possible to prevent a decrease in biological reaction efficiency in the membrane separation tank E2. Therefore, improvement of the processing efficiency in the membrane separation tank E2 is expected.
[0051]
[Another embodiment]
Another embodiment will be described below.
In the merged treatment septic tank having the first casing X1 and the second casing X2 buried underground, as shown in FIG. 3, a configuration in which household wastewater flows into the first casing X1 from the household wastewater pipe H3. It can be.
[0052]
At this time, the connection to the first casing X1 of the domestic miscellaneous drainage pipe H3 is performed only by adding a simple modification such as opening a miscellaneous drainage inlet different from the inlet 1 to the first casing X1. Can do. Alternatively, if the daily wastewater drain pipe H3 is joined with the existing human wastewater drainage pipe H4 (broken line portion), the wastewater drainage and the daily wastewater are collectively flowed into the first casing X1. There is no need to modify the casing X1.
[0053]
The first casing X1 has a function as a contaminant removal tank that precipitates and separates solids in human wastewater, and impurities such as toilet paper in human wastewater and household wastewater. After being demonstrated, the water to be treated can be naturally advected to the second casing X2 provided later.
[0054]
That is, since the water to be treated which has been pretreated such as removing foreign substances in the existing single treatment septic tank of the first casing X1 can be treated with activated sludge in the membrane separation tank E2 of the second casing X2, the membrane separation In the tank E2, since the activated sludge process proceeds in a state where it is difficult for a solid content or the like that is heavily loaded and difficult to be aerobic to flow into the membrane separation tank E2, the water treatment capacity of the membrane separation tank E2 is further increased. Highly maintainable.
[0055]
At this time, since the cleaning in the tank may be performed mainly for the first casing X1, labor and cost required for cleaning can be reduced. Further, in the cleaning of the second casing X2, it is only necessary to perform processing such as sludge extraction from the contaminant removal tank N1 and the sludge concentration adjustment tank P only when necessary.
[Brief description of the drawings]
FIG. 1 is a schematic view of a combined septic tank of the present invention.
FIG. 2 is a schematic view showing a piping system of a combined septic tank according to the present invention.
FIG. 3 is a schematic view of another embodiment showing the piping system of the combined septic tank of the present invention.
FIG. 4 is a schematic diagram of a conventional merged septic tank.
[Explanation of symbols]
X1 first casing
X2 Second casing
2 Precipitation separation chamber
3 Aeration room
N1 contaminant removal tank
E1 Flow adjustment tank
E2 membrane separation tank
H2-3 Daily life drainage piping

Claims (3)

Water to be treated is transferred from the first casing, which is an independent treatment septic tank, in which an aerobic treatment tank for aerobically treating the water to be treated to a second casing in which an activated sludge treatment tank for treating the treated water is activated. In the merged septic tank that is set up so that it can freely move,
A household wastewater pipe for allowing household wastewater to flow in is connected to the second casing, and a flow rate adjustment tank for storing the treated water and adjusting the flow rate is provided upstream of the activated sludge treatment tank in the second casing. the provided Oh Rutotomoni, Ri Oh provided contaminant removal bath to remove contaminants upstream of the flow regulation tank, septic tanks where the are stops aeration aerobic treatment tank. Water to be treated is transferred from the first casing, which is an independent treatment septic tank, in which an aerobic treatment tank for aerobically treating the water to be treated to a second casing in which an activated sludge treatment tank for treating the treated water is activated. In the merged septic tank that is set up so that it can freely move,
A household wastewater pipe for allowing household wastewater to flow is connected to the first casing, and a flow rate adjustment tank for storing treated water and adjusting the flow rate with respect to the second casing is the activated sludge treatment tank. A combined septic tank in which a contaminant removal tank for removing impurities is provided upstream of the flow rate adjustment tank. The contaminant removal tank is provided with an advection pipe having an opening at the lower end, and the treated water that brings the contaminant removal tank to a predetermined water level or higher is guided to the upper end of the advection pipe to other than the flow rate adjustment tank. The merged septic tank according to claim 1 or 2 , wherein a guide path is provided.

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