JP2017154110A - Circulation type toilet system and wastewater treatment method for circulation type toilet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circulation type toilet system that can be used even though a lifeline is cut off in the event of a disaster or the like and can manage an electric power required for operating the toilet system only by a small scale of photovoltaic power generation apparatus.SOLUTION: In a circulation type toilet system 10 comprising subjecting sewage discharged from a flush toilet bowl 100 to solid-liquid separation in a solid-liquid separation tank 200 to form a primary treatment water, then subjecting the primary treatment water to soil treatment in a soil treatment tank 600 to thereby re-utilize the treated water in the flush toilet bowl 100, the use of a screw type lifting pump 400 as a wastewater pump for water-feeding the primary treatment water from a primary storage tank 300 to the soil treatment tank 600 reduces a starting current of the wastewater pump to a low level and as a result, an electric power required for operating the toilet system can be managed only by a small scale of photovoltaic power generation apparatus 900.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a circulating toilet system that purifies and uses the waste water of flush toilets and a circulating toilet drainage treatment method that can be implemented using the circulating toilet system.

  In the event of a disaster such as an earthquake, securing a sanitary excretion environment is very important from the viewpoints of preventing infectious diseases and reducing the mental stress of victims. At the time of a disaster, lifelines such as water supply and sewerage and electricity are often disconnected, and so far, there have been many evacuation-type temporary toilets used at construction sites. However, temporary flushing toilets (1) take a certain amount of time to be installed at the evacuation center, (2) frequent flushing operations are required, and the pumping is not in time due to the road not functioning. In such a case, there are problems such as being unable to continue to use hygienically, and (3) generating a strong odor during the high temperature season.

  On the other hand, a circulation toilet that can purify and reuse the waste water of flush toilets has also been proposed. For example, Patent Document 1 discloses a human waste treatment apparatus that primarily purifies human waste in the septic chambers 2a and 2b and then purifies it by permeating it into the soil treatment tank 3 and circulates and uses it as washing water for the flush toilet 1. Yes. Since the manure processing apparatus described in Patent Document 1 is supplied with power necessary for operation by the solar panel 13, it can be operated even when a commercial power source cannot be used. However, the conventional circulation toilet system such as the manure processing device described in Patent Document 1 is mainly for installation in areas where no discharge is required, such as water source recharge forests. It was unsuitable for installation in a residential area. This is because the conventional circulating toilet system supplies the primary treated water after solid-liquid separation processing (in Patent Document 1, the rot treatment in the first rot chamber 2a and the second rot chamber 2b) to the soil treatment tank. Because the starting current of the sewage pump (submersible pump 2c in FIG. 1 of the same document) is large, it is necessary to provide a large-scale solar power generation device, and it is difficult to install it in an urban area with limited space It is. Moreover, even if it was able to install temporarily, there also existed a problem that the installation cost of a solar power generation device became high.

Japanese Patent Laying-Open No. 2005-262077

  The present invention has been made to solve the above problems, and can be used even when lifelines such as electricity and water and sewage systems do not function normally during disasters. Provided is a circulating toilet system that can supply power necessary for operation with only a power generation device. The present invention also provides a circulating toilet wastewater treatment method that can be carried out using this circulating toilet system.

The above issues
Flush toilet,
A solid-liquid separation tank for solid-liquid separation of the sewage discharged from the flush toilet,
A primary storage tank for storing primary treated water treated in the solid-liquid separation tank;
A screw type pump for pumping the primary treated water stored in the primary storage tank, comprising an outer cylinder extending in a non-horizontal direction and a screw disposed in the outer cylinder;
The interior is filled with soil, and has a watering pipe buried in the soil and a water collecting part provided at the lower end of the soil, and the primary treated water pumped by the screw type pump is used as the watering pipe. A soil treatment tank that passes water and permeates it into the soil, collects it from the water collection section, and uses it as secondary treated water,
A pressurizing pump for sending the secondary treated water to the flush toilet,
A solar power generator for supplying electric power to operate a screw type pump and a pressure pump;
It is solved by providing a circulating toilet system with

  In the circulating toilet system of the present invention, since a screw type pump is adopted as a sewage pump for pumping up primary treated water, when a non-clog pump or a vortex pump generally used as a sewage pump is adopted. In comparison, it is possible to greatly suppress the starting current that flows when the pump is started. For this reason, since the circulation type toilet system of this invention can cover the electric power required for the operation only by a small-scale photovoltaic power generation apparatus, it can suppress not only an installation place but installation cost. It has become a thing. The screw-type water pump in the circulating toilet system of the present invention includes a non-horizontal outer cylinder and a screw arranged in the outer cylinder. By rotating the screw, the screw pump The flow of primary treated water is generated, and the primary treated water near the lower end of the outer cylinder can be pumped up to the vicinity of the upper end of the outer cylinder. The term “soil” as used herein includes not only so-called “soil” such as red or black soil, but also various gravels, granular porous materials, and the like.

  The circulating toilet system of the present invention may further include an inverter device for driving the screw type pump. As a result, the screw pump can be started while controlling the frequency and voltage, so that the pump can be started while adjusting the starting current so that it does not increase, and the power required for the operation of the circulating toilet system can be reduced. Further, it can be kept low.

  In the circulating toilet system of the present invention, if the difference between the outer radius of the screw of the screw-type pump and the inner radius of the outer cylinder is too large, the primary treated water is likely to leak from the gap, and the water is efficiently pumped. There is a possibility that it cannot be done. For this reason, the difference between the outer radius of the screw and the inner radius of the outer cylinder in the screw type pump is preferably 10 mm or less. The difference between the outer radius of the screw and the inner radius of the outer cylinder is more preferably 7 mm or less, and further preferably 5 mm or less. On the other hand, if the difference between the outer radius of the screw and the inner radius of the outer cylinder is made too small, the rotational resistance of the screw increases and it becomes easy to consume extra power. For this reason, it is preferable that the difference between the outer radius of the screw and the inner radius of the outer cylinder in the screw pump is 1 mm or more. The difference between the outer radius of the screw and the inner radius of the outer cylinder is more preferably 2 mm or more, and further preferably 2.5 mm or more. Thereby, primary treated water can be pumped efficiently with little electric power.

  In the circulating toilet system of the present invention, it is preferable to provide a planting layer having soilable soil quality on the surface layer of the soil filled in the soil treatment tank. Because, in the soil treatment tank, aerobic treatment of primary treated water by aerobic microorganisms is performed, so when planting on the surface layer, plant roots are spread around the planting layer This is because a fine space is created and the deep position of the soil becomes an aerobic environment, and the aerobic treatment of the primary treated water is efficiently performed. As an aerobic treatment in general sewage treatment, there is an activated sludge method in which aeration is performed, but considerable electric power is required to perform aeration continuously. In this regard, the aerobic treatment using the soil treatment tank with the planting on the surface layer can realize an efficient aerobic treatment without using electric power. Moreover, the treatment speed of the primary treated water in the soil treatment tank can be increased by moving a part of the primary treated water that has penetrated into the soil to the planting layer by capillary action and using it for plant growth. .

In the circulating toilet system of the present invention, the soil filled in the soil treatment tank has a layer structure including a water spray layer including a water spray pipe and a permeation layer arranged adjacent to the lower side of the water spray layer. and then, preferably the ratio _P d / _{P p} of the permeability _{P p} permeability _{P d} and the transmissive layer watering layer is made to be a 10 to 10 ^4. As a result, the primary treated water that has permeated into the water spray layer from the water spray pipe does not immediately move to the permeation layer, but spreads horizontally in the water spray layer and then drops to the permeation layer. . For this reason, the purification treatment of the primary treated water in the permeable layer can be made more efficient by allowing the primary treated water to pass through the wide range of the permeable layer evenly.

The above issues are also
A solid-liquid separation process for solid-liquid separation of the sewage discharged from the flush toilet,
A primary storage step for storing the primary treated water treated in the solid-liquid separation step;
A pumping process in which the primary treated water stored in the primary storage process is pumped by a screw-type pump;
A soil treatment process in which primary treated water pumped by a screw-type pump is passed through a sprinkler pipe embedded in the soil and infiltrated into the soil, and is recovered from the water collecting section at the lower end to be used as secondary treated water; ,
A pressurizing process for sending the secondary treated water to the flush toilet,
A solar power generation process for supplying electric power to operate a screw type pump and a pressure pump;
It can also be solved by providing a circulating toilet wastewater treatment method comprising:

  As a result, it becomes possible to recycle and reuse the toilet drainage with less power. For this reason, it is possible to provide power necessary for the operation with only a small-scale photovoltaic power generation apparatus, and it is possible to provide a circulating toilet system that can be installed not only at an installation location but also at a reduced installation cost. .

  As described above, according to the present invention, it can be used even when lifelines such as electricity and water and sewage systems do not function normally at the time of a disaster, etc., and is necessary for operation only with a small-scale photovoltaic power generation device. It becomes possible to provide a circulation type toilet system that can supply electric power. Moreover, the circulation type toilet drainage processing method which can be implemented using this circulation type toilet system can also be provided.

It is a mimetic diagram showing the whole circulation type toilet system of this embodiment. It is a side view of the screw type pumping pump in the circulation type toilet system of this embodiment. It is sectional drawing which cut | disconnected the screw and the outer cylinder in the surface perpendicular | vertical to a pumping direction in the screw type pumping pump in the circulation type toilet system of this embodiment. It is sectional drawing which cut | disconnected the soil treatment tank in the circulation type toilet system of this embodiment by the vertical surface substantially perpendicular to a water spray pipe.

  Preferred embodiments of the present invention will be described in more detail with reference to the drawings. However, the circulation toilet system of the present invention is not limited to the form described below, and can be appropriately changed without departing from the gist of the present invention.

1. Circulating Toilet System FIG. 1 is a schematic diagram showing the entire circulating toilet system 10 of the present embodiment. In FIG. 1, a part of the primary storage tank 300 is broken to expose a screw-type water pump 400 installed therein. As shown in FIG. 1, the circulating toilet system 10 of the present embodiment includes a flush toilet 100, a solid-liquid separation tank 200, a primary storage tank 300, a screw-type pumping pump 400, a flow rate adjustment tank 500, A soil treatment tank 600, a secondary storage tank 700, a surplus tank 710, a pressure pump 800, a solar power generation device 900, and an inverter device 910 are provided. The solid-liquid separation tank 200 is a three-tank type that includes a first separation tank 210, a second separation tank 220, and a third separation tank 230.

  The sewage discharged from the flush toilet 100 flows down to the first separation tank 210 of the solid-liquid separation tank 200, and is subjected to solid-liquid separation in multiple stages while undergoing anaerobic treatment in the solid-liquid separation tank 200 and the primary treated water. Become. The primary treated water is stored in the primary storage tank 300 and is pumped and pumped to the soil treatment tank 600 by the screw-type pumping pump 400 several times a day. In the circulating toilet system 10 of the present embodiment, a flow rate adjustment tank 500 for adjusting the amount of water supplied to the soil treatment tank 600 is provided between the primary storage tank 300 and the soil treatment tank 600. The primary treated water sent to the soil treatment tank 600 is treated by passing through the soil filled in the soil treatment tank 600 and recovered as secondary treated water. The recovered secondary treated water is stored in the secondary storage tank 700, and is pumped to the pre-purified water tank 110 for storing the flush water of the flush toilet 100 by the pressurizing pump 800, and the flush toilet 100 Used for cleaning.

  The electric power necessary for the operation of the circulating toilet system 10 according to the present embodiment is provided by combining the amount of electric power supplied from the commercial power source and the electric power generated by the solar power generation device 900 in normal times. When the power supply from the commercial power supply is stopped, all of the power can be covered by the power generated by the photovoltaic power generation apparatus 900. An inverter device 910 is provided in a power transmission circuit that connects the photovoltaic power generation apparatus 900 and the screw type pumping pump 400, and the frequency and voltage of electricity transmitted to the screw type pumping pump 400 can be controlled. ing.

  In the circulating toilet system 10 of this embodiment, as shown in FIG. 1, the solid-liquid separation tank 200, the primary storage tank 300, the flow rate adjustment tank 500, the soil treatment tank 600, and the secondary storage tank 700 The surplus tank 710 is installed in a state where it is buried in the ground. The solid-liquid separation tank 200, the primary storage tank 300, the flow rate adjustment tank 500, the secondary storage tank 700, and the surplus tank 710 are provided with inspection ports for maintenance so as to be exposed to the ground surface and blocked with a lid. Yes. However, the circulating toilet system 10 of the present invention is not particularly limited in the installation location of each component. In the circulating toilet system 10 of the present invention, all the configurations including the soil treatment tank 600 can be installed on the ground, inside the building, on the roof, etc., but as shown in this embodiment, a part of the configuration Is preferably buried in the ground because it is less likely to be damaged during disasters such as earthquakes and fires. Moreover, it is preferable to provide the partial structure of the circulation type toilet system 10 in the state buried in the ground also from the viewpoint on the landscape.

  As described above, the circulating toilet system 10 of the present invention can purify and recycle sewage and reuse it as toilet flushing water, and even if the power supply of the commercial power source is cut off during a disaster or the like, It can continue to operate only with the electric power generated by the photovoltaic power generation apparatus 900. In addition, the circulating toilet system 10 according to the present invention does not require a large-scale solar power generation device, and can provide its operating power with only the small-scale solar power generation device 900. Regardless of the installation location, it is excellent in terms of cost. This is because the circulating toilet system 10 of the present invention employs the screw-type pumping pump 400 as a pump for pumping the primary treated water from the primary storage tank 300, and from the photovoltaic power generation device 900 to the screw-type pumping pump 400. This is because since the inverter circuit 910 is provided in the power transmission circuit, the sewage pump that has conventionally required a large amount of power can be started with low power. Hereinafter, each structure of the circulation type toilet system 10 of this invention is demonstrated concretely.

2. Flush toilet bowl The flush toilet bowl 100 is not particularly limited in its type and shape, and a general flush toilet bowl can be adopted. However, it is preferable that the flush toilet 100 is a toilet bowl that can be washed with a small amount of water in order to be able to cope with an increase in the number of users during a disaster or the like. In this embodiment, the wash water tank 110 that stores the secondary treated water that has been soil treated in the soil treatment tank 600 and pumped by the pressure pump 800 until it is used for washing the flush toilet 100 is provided. Provided.

3. Solid-liquid separation tank and primary storage tank As shown in FIG. 1, the solid-liquid separation tank 200 in the circulating toilet system 10 of the present embodiment includes a first separation tank 210, a second separation tank 220, and a third separation tank. 230, and the sewage from the flush toilet 100 is solid-liquid separated in three stages. The primary storage tank 300 is for storing the primary treated water processed in the solid-liquid separation tank 200. The movement of the treated water from the first separation tank 210 to the second separation tank 220, from the second separation tank 220 to the third separation tank 230, and from the third separation tank 230 to the primary storage tank 300, This is done by inflow.

  In general, the solid-liquid separation treatment of sewage is often a combination of a physical treatment that separates a solid component and a liquid component and a biological treatment using microorganisms. Biological treatment is roughly divided into an aerobic treatment and an anaerobic treatment. The solid-liquid separation tank 200 in the circulating toilet system 10 of the present invention performs an anaerobic treatment. This is because when aerobic treatment is performed at the same time as solid-liquid separation treatment, since aeration is generally required, a considerable amount of power is required for continuous aeration. It is against it. In this respect, the anaerobic treatment employed in the present invention does not require aeration. In addition, even if the BOD value of sewage varies, the processing capacity is unlikely to decrease, so that it is possible to stably perform processing even in disasters where the number of users tends to change significantly.

  The solid-liquid separation tank 200 conforms to the “European septic tank structure standard” of the Building Standard Law and the septic tank law, and can separate the sewage from the flush toilet 100 in an anaerobic environment. The solid-liquid separation system and structure are not limited. The solid-liquid separation tank 200 in the present embodiment is a three-tank type equipped with a first separation tank 210, a second separation tank 220, and a third separation tank 230. It may be a tank type or a two tank type, and may be provided with four or more separation tanks. Moreover, although the solid-liquid separation tank 200 may be made to connect between each separation tank with a water pipe like this embodiment, a separation wall is provided in the solid-liquid separation tank 200, and solid-liquid separation is carried out in steps. You may make it isolate | separate. In order to efficiently treat the primary treated water treated in the solid-liquid separation tank 200 in the soil treatment tank 600 as the next treatment step, the solid-liquid separation tank 200 has a BOD of 100 to 150 mg of the primary treated water. / L can be reduced to about L. However, if the BOD of the primary treatment water is too low, the aerobic treatment of the primary treatment water in the soil treatment tank 600 described later may not be performed efficiently. It is preferable that the BOD is not lowered below about 50 to 70 mg / L.

4). FIG. 2 is a side view of the screw-type water pump 400 in the circulating toilet system 10 of the present embodiment. In FIG. 2, a part of the outer cylinder 430 is broken to expose the screw 420. Moreover, in order to show the positional relationship of the screw type pumping pump 400 and the primary storage tank 300, the primary storage tank 300 is displayed with the broken line. In this embodiment, as shown in FIG. 2, the screw type pump 400 includes a screw 420, an outer cylinder 430 that covers the periphery of the screw 420, a driving unit 440 for rotating the screw 420, and a driving unit 440. A shaft 450 for transmitting the driving force to the screw 420 is provided, and is provided inside the primary storage tank 300.

  The screw type water pump 400 sucks the primary treated water into the outer cylinder 430 from an opening (not shown) provided in the lower part of the outer cylinder 430 by rotating the screw 420 in one direction by the driving means 440. Thus, it is possible to pump up to the vicinity of the upper end of the outer cylinder 430. The pumped primary treated water is sent to the soil treatment tank 600 (see FIG. 1) through the flow rate adjustment tank 500 (see FIG. 1). The flow rate adjusting tank 500 temporarily stores the primary treated water to buffer the pumping speed of the screw type pump 400 and the intake speed of the primary treated water into the soil treatment tank 600 when there is a difference. It is meant to be Pumping of the primary treated water by the screw pump pump 400 may be performed continuously, but is preferably performed intermittently. Specifically, it is preferable to supply a large amount of primary treated water to the soil treatment tank 600 at a time several times a day. Thereby, as will be described later, the aerobic treatment in the soil treatment tank 600 can be made efficient.

The screw-type pumping pump 400 in the present embodiment is provided inside the primary storage tank 300, but the screw-type pumping pump 400 pumps the primary treated water stored in the primary storage tank 300 and soil treatment tank 600. If it can be sent to, the installation location is not particularly limited. In this embodiment, the pumping height L ₁ by the screw type pump 400 is about 0.5 to ₁ m, but the pumping height L ₁ is appropriately changed according to the design of the circulating toilet system 10. be able to. However, the pumping height L ₁ is too high, the load tends to increase according to the screw 420. Therefore, pumping height L ₁ preferably when less 4m, more preferable to less 2m.

Screw pump - 400 in the present embodiment, although it shall be substantially vertically pumping the primary treated water, it can achieve the desired pumping height L _1, as long as it is a non-horizontal, screw type water pumps 400 The pumping direction is not particularly limited, and may be inclined with respect to the vertical direction. The outer cylinder 430 is generally a cylinder that covers the entire outer surface of the screw 420. However, when the outer cylinder 430 is inclined with respect to the vertical direction, it may be a semi-cylinder that covers only the lower side of the screw 420. it can. The screw 420 may be provided eccentric with respect to the central axis of the outer cylinder 430. In the present embodiment, the outer cylinder 430 is formed in a cylindrical shape in which the rotation axis of the screw 420 and the central axis of the outer cylinder 430 are substantially coincident.

FIG. 3 is a cross-sectional view of the screw-type pumping pump 400 in the circulating toilet system 10 of the present embodiment, in which the screw 420 and the outer cylinder 430 are cut along a plane perpendicular to the pumping direction. In the present embodiment, the difference L ₂ between the outer radius of the screw 420 and the inner radius of the outer cylinder 430 is adjusted to be about 3 mm, thereby enabling the primary treated water to be pumped efficiently. ing.

The circulating toilet system 10 of the present invention, the difference between L ₂ and the inner radius of the outer radius and the outer cylinder 430 of the screw 420 is not particularly limited. However, if the difference between L ₂ and the inner radius of the outer radius and the outer cylinder 430 of the screw 420 is too large, the gap tends to fall leakage primary treated water from efficiently that there is a risk that can not be pumped. Therefore, the difference between _{L 2} and the inner radius of the outer radius and the outer cylinder 430 of the screw 420, preferably when the 10mm or less, and more preferably when the 7mm or less, more preferably to 5mm or less. On the other hand, when the difference between L ₂ and the inner radius of the outer radius and the outer cylinder 430 of the screw 420 is too small, the rotational resistance of the screw 420 is increased, there is a fear that extra consumption of electric power. Therefore, the outer radius and the difference between _{L 2} and the inner radius of the outer cylinder 430 of the screw 420 is preferably When 1mm or more, more preferably when a 2mm or more, further preferable to set 2.5mm or more.

The inner diameter L ₃ of the screw 420 is not particularly limited as long as it is possible to maintain the strength of the screw 420. The outer diameter L ₄ of the screw 420 is not particularly limited, but if the outer diameter L ₄ of the screw 420 is excessively large, a large force is required to rotate the screw 420, and there is a possibility that a large amount of power is consumed. is there. Therefore, the outer diameter _{L 4} of the screw 420, preferably when the 150mm or less, more preferably to 130mm or less. On the other hand, when the outer diameter L ₄ of the screw 420 is too small, there may not be able to pumping efficiently primary treatment water. Therefore, the outer diameter _{L 4} of the screw 420, preferably when the 50mm or more, and more preferably to 70mm or more. In this embodiment, the outer diameter _{L 4} of the screw 420, is about 100 mm.

The pitch L ₅ (see FIG. 2) of the blade 421 of the screw 420 in the screw type pump 400 is not particularly limited. However, if the pitch L ₅ of the blades 421 is too wide, there may not be able to pumping efficiently primary treatment water. Therefore, the ratio L ₅ / L ₄ of the pitch L ₅ of the blades 421 to the outer diameter L ₄ of the screw 420 is preferably 2.0 or less, and more preferably 1.5 or less. On the other hand, even if the pitch L ₅ of the blades 421 is too narrow, there may not be able to pumping efficiently primary treatment water. Therefore, the ratio L ₅ / L ₄ of the pitch L ₅ of the blade 421 to the outer diameter L ₄ of the screw 420 is preferably 0.5 or more, and more preferably 0.7 or more. In this embodiment, the ratio L ₅ / L ₄ of the pitch L ₅ of the blade 421 to the outer diameter L ₄ of the screw 420 is about 1.0. The screw 420 is depicted as being right-handed in FIG. 2, but may be left-handed.

  The screw type pumping pump 400 according to the present invention can be started and operated only by the electric power supplied from the solar power generation device 900 even when the power supply from the commercial power supply is stopped in the event of a disaster or the like. ing. However, if the bad weather continues, there is a possibility that the photovoltaic power generation apparatus 900 cannot supply sufficient power. For this reason, the circulating toilet system 10 of this embodiment is also provided with a manual pump 460 for manually pumping up the primary treated water stored in the primary storage tank 300, as shown in FIG. As long as the manual pump 460 can pump the primary treated water without using electric power, the type thereof is not limited, and the manual pump 460 may be operated by a body part other than the hand.

5. Soil Treatment Tank FIG. 4 is a cross-sectional view of the soil treatment tank 600 in the circulating toilet system 10 of the present embodiment cut along a vertical plane substantially perpendicular to the water spray pipe 621. As shown in FIG. 4, the soil treatment tank 600 in the present embodiment is arranged on the surface layer of the soil treatment tank 600 and has a planting layer 610 having soilable soil quality and a watering layer 620 in which a watering pipe 621 is embedded. A permeation layer 630 disposed below the sprinkling layer 620, an adsorption layer 640 disposed below the permeation layer 630 and containing a cation-exchangeable porous material, and a water collection pipe 651, And a water collection layer 650 that functions as a water collection unit for collecting the treated water that has passed. A water shielding sheet 601 for preventing treated water from leaking to the outside is provided on the outer wall surface of the underground portion of the soil treatment tank 600. In FIG. 4, leafy vegetables are indicated by broken lines as examples of plants that can be planted in the planting layer 610.

  The soil treatment tank 600 in the circulating toilet system 10 of the present invention is for purifying the primary treated water by allowing the soil to pass therethrough. That is, the primary treated water pumped and pumped by the screw type pump 400 and passed through the sprinkler pipe 621 embedded in the soil treatment tank 600 is transferred from the sprinkler pipe 621 whose side wall is permeable to the sprinkler layer 620. Exudates. A part of the treated water that has oozed into the water spray layer 620 moves to the planting layer 610 provided above the water spray layer 620 by capillarity, and the remaining part permeates and falls into the permeable layer 630 according to gravity. The treated water that has passed through the permeable layer 630 further passes through the adsorption layer 640, and is collected by a water collecting pipe 651 provided in the water collecting layer 650, and is used as a secondary treated water in the secondary storage tank 700 (see FIG. 1). (See below).

  In the sprinkling layer 620, the planting layer 610, and the permeation layer 630, the treated water is aerobically biotreated by microorganisms that inhabit the soil and is physically filtered by passing through the soil. Moreover, the phosphoric acid contained in the treated water is adsorbed and removed by the soil. Ammonia nitrogen contained in the treated water is converted to nitrate nitrogen by aerobic treatment by microorganisms, and together with potassium contained in the treated water and phosphoric acid adsorbed on the soil, the plant is planted in the planting layer 610. It is absorbed from the roots and used as a fertilizer for plant growth. The adsorption layer 640 contains zeolite and can adsorb odorous substances such as ammonia and pigment components contained in the treated water to deodorize and decolorize the treated water. As described above, the soil treatment in the soil treatment tank 600 can remove the organic matter, nitrogen, phosphoric acid, insoluble matter, and the like contained in the primary treated water, and can purify the primary treated water in a multifaceted manner. . In the circulating toilet system 10 of this embodiment, the BOD of the secondary treated water obtained through the soil treatment in the soil treatment tank 600 is about 5 mg / L or less.

  The planting layer 610 is located on the surface layer of the soil treatment tank 600 and has a soil quality suitable for planting. In this embodiment, leafy vegetables are planted in the planting layer 610 as shown in FIG. This is because when a plant is planted in the planting layer 610, the aerobic treatment in the soil treatment tank 600 can be made efficient. That is, when plant roots are stretched around the planting layer 610, a fine space can be formed in the soil of the planting layer 610, and oxygen necessary for aerobic treatment by microorganisms is abundant in the soil. Will be able to supply. For this reason, the plant planted in the planting layer 610 is not particularly limited, but is preferably a vegetable that has roots deep into the ground and is nitric acid-rich. Specifically, Lotus and Komatsuna are suitable. In addition, when primary treated water is sent to the soil treatment tank 600, fertilizer components such as nitrogen, phosphoric acid, and potassium and water are supplied to the planting layer 610. Plants can be nurtured vigorously without using fertilizer or topdressing, and can be used as food in times of disaster.

  The soil of the planting layer 610 is not particularly limited as long as it is suitable for planting a desired plant. In this embodiment, soil mixed with rice husk powdered coal is used for the planting layer 610. This is because rice husk pulverized coal contains many microorganisms suitable for aerobic treatment, improves the air permeability of soil, and can also deodorize and decolorize treated water. The vertical thickness of the planting layer 610 is normally 150 to 300 mm, and is about 220 mm in this embodiment.

The water sprinkling layer 620 is for spreading the primary treated water leached from the buried sprinkling pipe 621 in the horizontal direction of the soil treatment tank 600. For this reason, the primary treated water that has leached from the water spray pipe 621 to the water spray layer 620 does not immediately drop to the permeable layer 630, but spreads in the water spray layer 620 in the horizontal direction and then gradually moves to the permeable layer 630. It is preferable. Specifically, it is preferable that the ratio P _d / P _p between the water permeability coefficient P _d of the water spray layer 620 and the water permeability coefficient P _p of the transmission layer 630 be 10 or more. The ratio P _d / P _p is more preferably 10 ² or more. However, if the ratio P _d / P _p is increased too much, the treated water does not readily penetrate from the sprinkling layer 620 to the permeable layer 630, and the sprinkling layer 620 is immersed in water and becomes an anaerobic environment. May decrease. For this reason, it is preferable that the ratio P _d / P _p be 10 ⁴ or less. The ratio P _d / P _p is more preferably 5 × 10 ³ or less. In this embodiment, the ratio P _d / P _p is about 10 ³ .

Soil watering layer 620 is not particularly limited as long as it has the desired permeability P _d, in this embodiment, it is assumed that contains humus or dead leaves. Since these contain many microorganisms suitable for an aerobic process, the aerobic process in the sprinkling layer 620 can be made efficient. The vertical thickness of the sprinkling layer 620 is usually 80 to 200 mm, and is about 120 mm in this embodiment. It is preferable that the watering pipe 621 is embedded so that the upper end thereof is positioned 300 mm to 350 mm in the vertical direction from the upper end of the planting layer 610 of the soil treatment tank 600. This is because if the embedding position of the water spray pipe 621 is too shallow, the primary treated water that has exuded from the water spray pipe 621 directly hits the roots of the plant, and the plant may cause root rot, and the embedding position of the water spray pipe 621 is deep. It is because there is a possibility that the primary treated water exuded from the water spray pipe 621 may not be sufficiently supplied to the roots of the plant.

  The structure and the material of the water spray pipe 621 are not particularly limited as long as the primary treated water that has been allowed to flow through can be exuded to the water spray layer 620. The water spray pipe 621 in the present embodiment is a pipe having a skeleton in which a flexible resin is arranged in a spiral shape, and has a structure in which the skeleton is lined with a water-permeable nonwoven fabric, so that all directions of the side surfaces are provided. The primary treated water can be leached. The primary treated water oozes out from the water spray pipe 621 and does not descend directly below the water spray pipe 621 but permeates horizontally in the water spray layer 620 and then moves to the planting layer 610 and the transmission layer 630. This is preferable. For this reason, in this embodiment, as shown in FIG. 4, the water-impervious bowl-shaped member 622 disposed in the lower part of the water spray pipe 621 so as to receive the water spray pipe 621 and the water spray pipe 621 are in contact with each other. A water guide member 623 arranged so as to spread in the horizontal direction is provided.

  The water guide member 623 includes an upper water guide member 623 a provided in contact with the upper portion of the water spray pipe 621, and a lower water guide member 623 b provided between the water pipe 621 and the bowl-shaped member 622. ing. The upper water conveyance member 623a is for facilitating movement of the primary treated water to a wide range of the planting layer 610, and the lower water conveyance member 623b spreads the primary treated water horizontally in the sprinkling layer 620. It is intended to make it easier. The lower water guide member 623b also has a siphon-like function of sucking up primary treated water in the vicinity of the inner bottom portion of the bowl-shaped member 622. The material and shape of the bowl-shaped member 622 are not limited as long as the primary treated water can be prevented from moving directly below the sprinkling pipe 621. The water guide member 623 may be formed of any material as long as the primary treated water oozed from the water spray pipe 621 can be guided to spread in the horizontal direction, but in the present embodiment, the water guide member 623 is formed of a thick non-woven fabric. doing.

  The process of pumping the primary treated water by the screw type pump 400 and passing it through the sprinkling pipe 621 can be performed continuously at a low speed, but a large amount of the primary treated water is pumped at a time several times a day. It is preferable to pass water through the water spray pipe 621. This is because, when a large amount of primary treated water is passed through the sprinkler pipe 621 at a time, the treated water permeates over the entire soil in the soil treatment tank 600 and then drops toward the water collection layer 650 at a stroke. This is because air is drawn from the surface layer into the soil, making the soil a more aerobic environment and making the aerobic treatment more efficient.

The kind of the soil of the permeable layer 630 is not particularly limited as long as it has a desired water permeability P _p and is suitable for the growth of microorganisms that perform aerobic treatment. In this embodiment, the soil of the permeable layer 630 contains abundant aluminum components, phosphoric acid-adsorbing black soil, pure sand soil excellent in filtration performance, abundant aerobic microorganisms, It includes rice husk pulverized coal that improves air permeability and can be deodorized and decolored. The vertical thickness of the transmissive layer 630 is usually 200 to 450 mm, and is about 340 mm in this embodiment.

  In this embodiment, an adsorption layer 640 containing zeolite, which is a cation-exchangeable porous material, is provided between the permeable layer 630 and the water collection layer 650. Thereby, the odorous substance contained in the treated water passing through the adsorption layer can be adsorbed on the porous material, and the treated water can be deodorized. Moreover, the coloring matter contained in the treated water can also be adsorbed to decolorize the treated water. The porous material contained in the adsorption layer 640 is not limited to a cation exchange material, but if it is a cation exchange material, a cationic odorous substance such as ammonia can be efficiently adsorbed. The lower end portion of the adsorption layer 640 is provided with a split cloth 641 that has high water permeability but does not allow a porous material or the like to pass therethrough, thereby preventing the porous material or the like from entering the water collecting layer 650. The vertical thickness of the adsorption layer 640 is usually 50 to 150 mm, and is about 120 mm in this embodiment.

  In this embodiment, the water collection pipe 651 is formed of a water-permeable material, and portions other than the water collection pipe 651 in the water collection layer 650 are filled with gravel or the like. The structure of the water collection layer 650 is not particularly limited as long as it is located at the lower end of the soil treatment tank 600 and can collect treated water without leakage. The shape of the bottom of the soil treatment tank 600 may be flat as shown in FIG. 4 or may have a substantially V-shaped cross section that narrows toward the water collection pipe 651.

6). Secondary storage tank and pressure pump The secondary treated water subjected to soil treatment in the soil treatment tank 600 is stored in the secondary storage tank 700 (see FIG. 1). If the secondary storage tank 700 can store the secondary treated water processed in the soil treatment tank 600, the specific magnitude | size and structure will not be ask | required. In this embodiment, the surplus tank 710 for temporarily storing surplus secondary treated water is provided in case the secondary storage tank 700 overflows due to heavy rain or the like. The secondary treated water stored in the secondary storage tank 700 is pumped by the pressurizing pump 800 and is circulated and reused as cleaning water for the flush toilet 100 again. In the present embodiment, the pressurization pump 800 also includes a manual pump (not shown) similar to the manual pump 460 of the screw type pumping pump 400, and even when sufficient power is not supplied from the photovoltaic power generation apparatus 900. The secondary treated water can be pumped and used for cleaning the flush toilet 100.

7). Photovoltaic power generator The circulating toilet system 10 according to the present embodiment includes a solar power generator 900 that can supply all of the necessary power even when power supply from a commercial power supply is stopped during a disaster or the like. Yes. The solar power generation device 900 is not particularly limited in size and type as long as it can supply a desired amount of power according to the scale and installation location of the circulating toilet system 10. In the circulating toilet system 10 of this embodiment, the generated power of the solar power generation device 900 per flush toilet 100 may be about 0.075 kW. Although not shown in the figure, the circulating toilet system 10 may include a power storage device capable of storing electricity generated by the solar power generation device 900.

  In this embodiment, an inverter device 910 that can control the frequency and voltage of electricity is provided in the power transmission circuit that transmits the electric power generated by the solar power generation device 900 to the screw pump pump 400. Thereby, the screw type pumping pump 400 can be operated with more power saving. That is, when operating the screw type pumping pump 400, the largest amount of electric power is required at the time of starting. In this embodiment, the frequency of the power supplied to the solar power generation device 900 is determined by the inverter device 910. By starting the screw type pumping pump 400 gradually while optimizing the voltage, the starting current of the screw type pumping pump 400 can be greatly suppressed. For this reason, even if it makes the solar power generation device 900 small, the screw type pumping pump 400 can be started now. The type and capacity of the inverter device 910 are not particularly limited as long as the above purpose can be achieved.

8). Others In the circulation type toilet system 10 of this embodiment, as shown in FIG. 1, the rubber-made earthquake-proof joint 11 is used for the joint between process tanks. In the present invention, the material of the joint that connects the treatment tanks is not particularly limited. However, if the rubber earthquake-resistant joint 11 is used, even if the ground is deformed due to an earthquake or the like and the positional relationship between the treatment tanks is shifted, It is preferable because it can be prevented from being detached or damaged. Further, the material of the solid-liquid separation tank 200, the primary storage tank 300, the flow rate adjustment tank 500, the secondary storage tank 700, and the surplus tank 710 in the circulation toilet system 10 is not particularly limited. In order to make it difficult to break even if it is distorted or distorted, it is made of resin in this embodiment.

DESCRIPTION OF SYMBOLS 10 Circulation type toilet system 11 Seismic joint 100 Flush toilet 110 Preliminary water tank 200 Solid liquid separation tank 210 First separation tank 220 Second separation tank 230 Third separation tank 300 Primary storage tank 400 Screw type pumping pump 420 Screw 421 Blade 422 shaft 430 outer cylinder 440 drive means 450 shaft 460 manual pump 500 flow rate adjustment tank 600 soil treatment tank 601 water shielding sheet 610 planting layer 620 water spray layer 621 water sprinkling pipe 622 bowl-shaped member 623 water guide member 623a upper water guide member 623b lower water guide member 623b Member 630 Permeation layer 640 Adsorption layer 641 Split cloth 650 Water collection layer 651 Water collection pipe 700 Secondary storage tank 710 Surplus tank 800 Pressure pump 900 Solar power generation device 910 Inverter device L ₁ Pumping height L ₂ Outer radius and outside of screw The inner half of the tube The difference L ₃ the outer diameter of the screw of the inner diameter L ₄ screw L ₅ blade pitch and

Claims (6)

Flush toilet,
A solid-liquid separation tank for solid-liquid separation of the sewage discharged from the flush toilet,
A primary storage tank for storing primary treated water treated in the solid-liquid separation tank;
A screw type pump for pumping the primary treated water stored in the primary storage tank, comprising an outer cylinder extending in a non-horizontal direction and a screw disposed in the outer cylinder;
The interior is filled with soil, and has a watering pipe buried in the soil and a water collecting part provided at the lower end of the soil, and the primary treated water pumped by the screw type pump is used as the watering pipe. A soil treatment tank that passes water and permeates it into the soil, collects it from the water collection section, and uses it as secondary treated water,
A pressurizing pump for sending the secondary treated water to the flush toilet,
A solar power generator for supplying electric power to operate a screw type pump and a pressure pump;
Circulating toilet system equipped with. The circulation type toilet system of Claim 1 further provided with the inverter apparatus for driving a screw type pump. The circulating toilet system according to claim 1 or 2, wherein a difference between an outer radius of the screw and an inner radius of the outer cylinder in the screw pump is 1 to 10 mm. The circulation type toilet system of Claims 1-3 which provided the planting layer which has the soil quality which can be planted in the surface layer of the soil with which a soil processing tank is filled. The soil filled in the soil treatment tank has a layer structure including a water spray layer in which a water spray pipe is embedded, and a permeation layer arranged adjacent to the bottom of the water spray layer, and the water permeability coefficient P _d of the water spray layer. circulating toilet system according to claim 1 ratio _P d / _{P p} of the permeability _{P p} of the transmission layer is 10 to 10 ⁴ and. A solid-liquid separation process for solid-liquid separation of the sewage discharged from the flush toilet,
A primary storage step for storing the primary treated water treated in the solid-liquid separation step;
A pumping process in which the primary treated water stored in the primary storage process is pumped by a screw-type pump;
A soil treatment process in which primary treated water pumped by a screw-type pump is passed through a sprinkler pipe embedded in the soil and infiltrated into the soil, and is recovered from the water collecting section at the lower end to be used as secondary treated water; ,
A pressurizing process for sending the secondary treated water to the flush toilet,
A solar power generation process for supplying electric power to operate a screw type pump and a pressure pump;
A circulating toilet wastewater treatment method.

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