JP6522959B2 - Waste water treatment equipment - Google Patents

Description

  The present invention comprises a solid-liquid separation tank that includes a receiving unit for receiving the waste garbage crush processing waste, transfers the waste garbage crush processing waste from the receiving unit, and separates the waste garbage crush processing waste by precipitation; It is equipped with an aerobic treatment tank that receives the liquid phase separated in solid-liquid separation in the liquid separation tank and aerobically processes it, and is equipped with an anaerobic fermenter that receives and biogases the sediment separated in the solid-liquid separation tank. Draining means for transferring the liquid phase from the solid-liquid separation tank to the aerobic treatment tank, and return means for returning the precipitate separated in the aerobic treatment tank to the receiving part It relates to a processing device.

In recent years, garbage disposers tend to be disseminated in each household and collective housing for the purpose of volume reduction of garbage, etc. There is a tendency to install a wastewater treatment device capable of processing garbage shredded by disposers It is in.
Such a waste water treatment apparatus receives the garbage waste treatment waste fluid obtained by diluting the food waste subjected to the grinding treatment with water, solid-liquid separation in the solid-liquid separation tank, and the liquid phase separated in solid-liquid separation by aerobic treatment At the same time, aerobic treatment and purification are conducted, and the precipitate is biogasified in an anaerobic fermenter.

  In such a waste water treatment apparatus, conventionally, a solid-liquid separation tank and an aerobic treatment tank are provided adjacent to each other in a state of being separated by a dividing wall, and the supernatant liquid of the liquid phase is divided from the solid-liquid separation tank The upper end of the upper portion is overflowed and transferred to the aerobic treatment tank, and the transfer portion is configured as an overflow-like transfer portion at the upper end portion of the partition wall (for example, see Patent Document 1).

JP, 2013-27851, A

By the way, since the garbage in the garbage waste processing waste liquid contains floating solids floating in water, the upper layer of the solid-liquid separation tank is floating garbage (hereinafter suspended solids). It may be described as ") is mixed.
However, since the conventional waste water treatment apparatus has a configuration in which the supernatant liquid of the solid-liquid separation tank overflows the upper end of the partition wall and is transferred to the aerobic treatment tank, the supernatant liquid containing suspended matter is treated aerobically It will be transferred to the tank, and a relatively large amount of suspended matter will be transferred from the solid-liquid separation tank to the aerobic treatment tank.
Therefore, since the load of aerobic treatment in the aerobic treatment tank is increased, aerobic treatment is sufficiently performed in the aerobic treatment tank to improve the cleanliness of the drainage discharged from the aerobic treatment tank. There was room for

  This invention is made in view of this situation, The objective is to provide the waste-water-treatment apparatus which can improve the purity of the waste_water | drain which carries out a purification process and to discharge | emit.

[Configuration 1]
In order to achieve the above object, the waste water treatment apparatus according to the present invention comprises a receiving unit for receiving a garbage waste treatment waste solution,
A solid-liquid separation tank for transferring the garbage waste treatment waste solution from the receiving part to transfer the waste material waste treatment waste liquid;
It has an aerobic treatment tank for receiving and aerobically treating the liquid phase separated in the solid-liquid separation tank,
And an anaerobic fermenter for receiving and biogasifying the precipitate separated in the solid-liquid separation tank,
Providing a transfer unit for transferring a liquid phase from the solid-liquid separation tank to the aerobic treatment tank;
A waste water treatment apparatus comprising a return means for returning the precipitate separated in the aerobic treatment tank to the receiving part,
Characteristic features include a liquid phase advection section for advecting the liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a sediment advection section for advecting the precipitate in the lower part of the solid-liquid separation tank ,
The upper end as the lowest water level height of the solid-liquid separation tank, so as to partition the the solid-liquid separation tank and the anaerobic fermentation tank, provided with a partition wall upper end edge is the liquid phase advection part, said liquid phase A diffuser is provided on the receiving part side of the advection part, from the liquid surface of the solid-liquid separation tank or near the liquid surface, with an aeration direction as the upper end of the partition wall, for diffusing the anaerobic gas.
The point which provided the control mechanism which controls the advection of the floating matter between the aeration area of the above-mentioned aeration device, and the liquid phase inflow area of the above-mentioned transfer part.

[Operation effect 1]
According to the above configuration, solid waste liquid waste is separated from solid waste in the solid-liquid separation tank, and the precipitate separated is transferred to the anaerobic fermentation tank by the sediment transfer part, and the liquid phase of the supernatant is liquid phase While being transferred to the anaerobic fermentation tank by the advection part, it is transferred to the aerobic treatment tank by the transfer part.
In the liquid phase advection section, a partition wall is provided to separate the solid-liquid separation tank and the anaerobic fermentation tank, with the upper end being the lowest water level of the solid-liquid separation tank, and the liquid level of the solid-liquid separation tank Alternatively, since the anaerobic gas is diffused toward the upper end of the partition wall from near the liquid surface, the liquid layer of the supernatant of the solid-liquid separation tank in the state in which the suspended matter is mixed with the suspended matter mixed in It is flow-guided toward the upper end of the partition wall, overflows the upper end of the partition wall, and flows into the anaerobic fermentation tank.
And the suppression mechanism prevents the floating matter from flowing into the liquid phase inflow area of the transfer section from the aeration area.
As a result, since it is possible to suppress the transfer of the suspended matter in the solid-liquid separation tank to the aerobic treatment tank together with the liquid phase by the transfer unit, the load of the aerobic treatment in the aerobic treatment tank can be reduced. it can.
Therefore, it is possible to provide a waste water treatment apparatus capable of improving the cleanliness of the waste water to be purified and discharged.

[Configuration 2]
In addition, it comprises a sludge sedimentation tank for receiving the sediment separated in the aerobic treatment tank,
The return means comprises a first return path for returning precipitates from the aerobic treatment tank to the sludge settling tank, and a second return path for returning precipitates from the sludge settling tank to the receiving portion. And
The carrier gas in at least the second return path may be an anaerobic gas.

[Operation effect 2]
According to the above configuration, the precipitate separated in the aerobic treatment tank is returned to the sludge sedimentation tank through the first return path, and, for example, aerobically treated and reduced in volume in the sludge sedimentation tank, and sludge The precipitate deposited in the settling tank is returned to the receiving unit through the second return path. As a result, the amount of suspended solids transferred from the solid-liquid separation tank to the aerobic treatment tank together with the liquid phase can be further reduced by the transfer unit, and therefore the load of the aerobic treatment in the aerobic treatment tank can be further reduced. Can.
In addition, since the carrier gas in at least the second return path is the anaerobic gas, it is possible to prevent the anaerobic fermentation tank from being biased aerobically and the biogasification of the precipitate being reduced.
Therefore, the cleanliness of the waste water to be purified and discharged can be further improved.

[Configuration 3]
The transfer unit may transfer the liquid phase, which has been solid-liquid separated in the solid-liquid separation tank, to the aerobic treatment tank via the sludge sedimentation tank.

[Operation effect 3]
The liquid phase separated in the solid-liquid separation tank is transferred from the solid-liquid separation tank to the aerobic treatment tank to be received in the aerobic treatment tank and subjected to aerobic treatment, but a sludge sedimentation tank is provided. In the above configuration, instead of transferring the liquid phase from the solid-liquid separation tank directly to the aerobic treatment tank, the liquid phase may be transferred to the aerobic treatment tank via the sludge settling tank. That is, even with the above configuration, the liquid phase solid-liquid separated in the solid-liquid separation tank is subjected to aerobic treatment well, and the supernatant after the sludge is separated in the sludge sedimentation tank is also easily aerobically again A configuration that enables processing can be realized.

[Configuration 4]
Further, a side corresponding to one end side in the lateral direction of the partition wall in a state in which the processing waste solution advection unit for transferring the garbage waste processing waste solution from the receiving unit to the solid-liquid separation tank is opposed to the partition wall Set up,
The aeration device is provided between the processing waste solution advection unit and the partition wall, and is provided near the processing waste solution advection unit side.
Even if the liquid phase inflow region of the transfer portion is provided on the side corresponding to the side opposite to the processing waste solution advection portion side in the lateral direction of the partition wall with respect to the aeration region of the aeration device good.

[Operation effect 4]
According to the above-described configuration, the liquid dispersion of the supernatant of the solid-liquid separation tank can be more effectively flow-directed toward the upper end of the partition wall by the air diffuser, and the suspended matter is transported from the aeration area by the suppression mechanism. Can be properly prevented from flowing into the liquid phase inflow region of the fluid, so the amount of suspended matter transferred to the aerobic treatment tank by the transfer unit can be further reduced to further reduce the load of the aerobic treatment in the aerobic treatment tank. can do.
Therefore, the cleanliness of the waste water to be purified and discharged can be further improved.

[Configuration 5]
In addition, the restraining mechanism is a descending partition provided so as to descend below the liquid surface of the solid-liquid separation tank between the aeration area and the liquid phase inflow area in the solid-liquid separation tank, Also good.

[Operation effect 5]
According to the above configuration, since the floating member floating below the liquid surface of the solid-liquid separation tank is also prevented from flowing into the liquid phase inflow region from the aeration region by the suppression mechanism which is the descending partition, the transfer portion Thus, the amount of suspended matter transferred to the aerobic treatment tank together with the liquid phase can be further reduced to further reduce the load of aerobic treatment in the aerobic treatment tank.
Therefore, the cleanliness of the waste water to be purified and discharged can be further improved.

[Configuration 6]
Further, the suppression mechanism may be a liquid phase advection permitted suppression mechanism that allows the advection of the liquid phase between the aeration area and the liquid phase inflow area and suppresses the advection of the floating matter.

[Operation effect 6]
According to the above configuration, when the suppression mechanism is configured by the descending partition, the descending partition can be lowered to a deeper position of the solid-liquid separation tank by using the suppression mechanism as the liquid phase advection permitted suppression mechanism. Because this can be performed, it is possible to more effectively prevent the floating material from flowing into the liquid phase inflow region from the aeration region, and the amount of the floating material transferred to the aerobic treatment tank together with the liquid phase by the transfer unit is further reduced. Thus, the load of aerobic treatment in the aerobic treatment tank can be further reduced.
Therefore, the cleanliness of the waste water to be purified and discharged can be further improved.

[Configuration 7]
Further, the transfer unit is configured to include a tubular transfer path provided over the solid-liquid separation tank and the aerobic treatment tank,
The proximal end of the tubular transfer path may be disposed on the liquid surface side of the liquid phase of the solid-liquid separation tank, and the vicinity of the periphery of the proximal end may be the liquid phase inflow area.

[Operation effect 7]
According to the above configuration, the transfer portion is configured to include the tubular transfer path, whereby the base end of the tubular transfer path to be the liquid phase inflow portion is made to enter the liquid phase from the liquid surface of the solid-liquid separation tank It is possible to more effectively prevent the floating matter in the solid-liquid separation tank from flowing into the tubular transfer passage, and the amount of the floating matter transferred to the aerobic treatment tank together with the liquid phase by the transfer section. Can be further reduced to further reduce the load of aerobic treatment in the aerobic treatment tank.
Therefore, the cleanliness of the waste water to be purified and discharged can be further improved.

[Configuration 8]
Further, in the precipitate transfer unit, the space between the solid-liquid separation tank and the anaerobic fermentation tank can be blocked by the precipitate to prevent backflow of solid components from the anaerobic fermentation tank to the solid-liquid separation tank Together with a diaphragm to
A sediment advection mechanism is provided to transfer the precipitate to the anaerobic fermentation tank through the narrowing section, and to allow the excess liquid phase of the anaerobic fermentation tank to be returned to the solid-liquid separation tank through the narrowing section. May be

[Operation effect 8]
According to the above configuration, the precipitate separated in the solid-liquid separation tank precipitates and reaches the constriction part in the sediment transfer part. In the constriction section, a precipitate advection mechanism is provided that can block the solid-liquid separation tank and the anaerobic fermentation tank with the precipitate and prevent backflow of solid components from the anaerobic fermentation tank to the solid-liquid separation tank, Sediments are one-way advected from the solid-liquid separation tank to the anaerobic fermenter. On the other hand, the liquid phase containing the supernatant in the solid-liquid separation tank is anaerobically fermented in the anaerobic fermentation tank to produce biogas. Moreover, the sludge which consists of microorganisms of an anaerobic fermentation tank is hold | maintained in an anaerobic fermentation tank, and is hold | maintained without flowing out outside. That is, depending on the transfer rate of the excess liquid phase, a return flow of the liquid phase occurs from the anaerobic fermentation tank to the solid-liquid separation tank, but the precipitate exerts a filter effect and is included in the return flow from the anaerobic fermentation tank Anaerobic microorganisms remain in the sediment. Thereby, the anaerobic microorganism concentration in the anaerobic fermentation tank can be maintained at a high concentration. And in an anaerobic fermentation tank, although the precipitate of a solid-liquid separation tank flows in, the solid component inside an anaerobic fermentation tank is not returned to a solid-liquid separation tank, but the microorganism in an anaerobic fermentation tank is an anaerobic fermentation tank It is suppressed from flowing out and being reduced, and good anaerobic fermentation can be maintained, and an operating state can be maintained in which sediments corresponding to the volume of solid component reduced by anaerobic fermentation are sequentially replenished.
Therefore, in the anaerobic fermenter, since the precipitate can be efficiently biogasified, the amount of biogas produced can be increased.

[Configuration 9]
In addition, the constriction portion is provided with a slit-like outlet provided in the lower part of the solid-liquid separation tank, and a deposit in the solid-liquid separation tank can form a deposited layer which blocks and deposits the slit-like outlet May be

[Operation effect 9]
According to the above configuration, since the precipitates deposited in the lower part of the solid-liquid separation tank gather in the lower part at the slit-like outlet, they are collected and deposited at the slit-like outlet. Then, the precipitate deposited at the slit-like outlet functions as a filter for preventing the backflow of solid components such as sediment and microorganisms in the anaerobic fermentation tank from the anaerobic fermentation tank to the solid-liquid separation tank It will be.
Then, the sediment can be prevented from backflow of the solid component from the anaerobic fermentation tank while gradually flowing into the anaerobic fermentation tank by a simple configuration in which the slit-like outlet is used as a throttling part to hold the precipitate. As a result, the amount of precipitate in the anaerobic fermentation tank can be suitably maintained, the microorganisms in the anaerobic fermentation tank can be reliably held in the tank, and the generation of biogas can be favorably maintained.

[Configuration 10]
Further, the anaerobic fermentation tank is provided with an advection diffuser for diffusing anaerobic gas, the advection diffuser is provided with a gas supply apparatus for intermittently supplying anaerobic gas, and rising from below the slit-like outlet The precipitate advection mechanism may be formed by being arranged so as to form a gas-liquid mixed phase flow.

[Operation effect 10]
According to the above-mentioned configuration, the anaerobic gas is diffused into the anaerobic fermentation tank by the advection aeration device, whereby a gas-liquid mixed phase flow rising from the lower side of the slit-like outlet can be formed. When the gas-liquid mixed phase flow rises in the vicinity of the slit-like outlet, an ejector effect is generated due to the flow of the gas-liquid mixed-phase flow, and the precipitate trapped at the slit-like outlet is sucked out to the anaerobic fermentation tank side It functions as a sediment advection mechanism for advection from the tank to the anaerobic fermenter. At this time, it is the anaerobic gas that is supplied to the aeration apparatus, so the anaerobic fermentation conditions of the anaerobic fermenter can be maintained well. As such an anaerobic gas, for example, biogas generated in an anaerobic fermentation tank can be used.
Therefore, it is possible to configure the sediment advection mechanism with a simple configuration, and to control the amount of aeration intermittently aerated from the advection aeration device, and a simple control that only adjusts the aeration timing, from the solid-liquid separation tank The amount of sediment transferred to the anaerobic fermenter can be controlled.

[Configuration 11]
Further, the inside is divided into a plurality of water treatment tanks from one end side to the other end side, and the plurality of water treatment tanks are divided from the one end side into the anaerobic fermentation tank, the solid-liquid separation tank, the storage tank as the receiving part, It may be provided in order of the sludge settling tank which receives the sediment separated by the aerobic treatment tank, and the said aerobic processing tank.

[Operation effect 11]
According to the above configuration, the liquid phase separated in solid-liquid separation in the solid-liquid separation tank is transferred to the aerobic treatment tank without straddling the anaerobic fermentation tank, and can be made compact, and can be used for a long period of time It is possible to greatly reduce the possibility of constriction or blockage of the transfer passage of the liquid phase due to the adhesion of suspended matter. Moreover, by the anaerobic fermentation tank located nearest one end of the waste water treatment apparatus main body, since will be located in the most other end of the waste water treatment apparatus main aerobic treatment tank, said hot methane fermentation in anaerobic fermenter In the case where the heat supplied to the sludge settling tank or aerobic treatment tank is mitigated by shielding it with a solid-liquid separation tank or a storage tank, the solid-liquid separation tank is suitable for high temperature methane fermentation It becomes easy to maintain heating to a temperature range of 50 ° C. to 80 ° C. (for example 55 ° C.). Therefore, it is possible to reduce the energy supply amount required to maintain the temperature, and the temperature at which the drainage temperature in the aerobic treatment tank becomes too high (for example, 35 ° C. or more) and the activity of aerobic microorganism is less likely to occur. It can be maintained in the range (eg, about 30 ° C.).

Longitudinal front view of waste water treatment equipment Diagram showing solid-liquid separation tank and anaerobic fermentation tank in wastewater treatment equipment Cross-sectional plan view of solid-liquid separation tank and anaerobic fermentation tank in wastewater treatment equipment Figure showing transition of T-COD of supernatant liquid transferred to aerobic treatment tank and wastewater discharged from aerobic treatment tank Cross-sectional plan view of the wastewater treatment device in another embodiment Longitudinal front view of waste water treatment apparatus in another embodiment Cross-sectional plan view of the wastewater treatment device in another embodiment Longitudinal front view of waste water treatment apparatus in another embodiment

  Hereinafter, the waste water treatment apparatus according to the embodiment of the present invention will be described based on the drawings. Although preferred embodiments are described below, these embodiments are each described in order to illustrate the present invention more specifically, and various changes can be made without departing from the spirit of the present invention. The present invention is not limited to the following description.

[Drainage treatment equipment]
The waste water treatment apparatus according to the embodiment of the present invention, as shown in FIG. 1 to FIG. 3, comprises a receiving port 11 for receiving the waste waste grinding waste, and the waste waste grinding waste received at the receiving inlet 11 Reservoir 1 (an example of the receiving part), solid waste separation tank 2 which deposits garbage separation waste waste by accreting garbage waste treatment waste liquid from the storage tank 1 and precipitates in solid liquid separation tank 2 Anaerobic fermentation tank 3 that receives separated sediment and biogases it, aerobic processing tank 4 that receives liquid phase that has been solid-liquid separated in solid-liquid separation tank 2, and aerobically processed, and aerobic processing tank 4 The sludge settling tank 5 etc. which receive the sediment separated by sedimentation are comprised.

  In addition, the treatment waste liquid transfer unit 12 for transferring the garbage waste treatment waste received in the storage tank 1 to the solid-liquid separation tank 2, and the solid solution (ie, liquid phase) from the solid-liquid separation tank 2 to the aerobic treatment tank 4 Transfer unit M to transfer, liquid phase transfer unit 21 to transfer supernatant (that is, liquid phase) from solid-liquid separation tank 2 to anaerobic fermentation tank 3, sediment transfer unit 22 to transfer precipitates, aerobic treatment tank 4 A return means R is provided for returning the precipitate separated at step 1 to the storage tank 1.

In this embodiment, as shown in FIG. 1, the return means R is a first return passage 41 for returning sludge (an example of precipitate) mainly from the aerobic treatment tank 4 to the sludge settling tank 5, and a sludge settling tank It comprises and the 2nd return path 51 which returns sludge (an example of a precipitate) mainly from 5 to the storage tank 1 and comprising.
Furthermore, the biogas taken out from the biogas outlet 31 and the biogas outlet 31 from the biogas outlet 31 through the biogas outlet 37 can be temporarily stored, and can be sent to the outside as needed. A biogas tank T and a drainage port 42 for discharging treated wastewater treated aerobically in the aerobic treatment tank 4 to the outside are provided.

  Then, the garbage waste processing waste received from the receiving port 11 is separated by settling in the solid-liquid separation tank 2, the precipitate is biogasified by anaerobic fermentation in the anaerobic fermentation tank 3, and the biogas is extracted from the biogas outlet 31 The liquid phase is removed by the biogas removal path 37, and the liquid phase is purified by the aerobic treatment in the aerobic treatment tank 4 and discharged as the clean drainage from the drainage port 42 to the outside.

  Specifically, as shown in FIG. 1, the inside of the waste water treatment apparatus main body A is aligned with the left and right direction of the waste water treatment apparatus main body A by four partition walls W12, W23, W35, W45 (the right and left direction in FIG. ), The storage tank 1, solid-liquid separation tank 2, anaerobic fermentation tank 3, sludge sedimentation tank 5, and aerobic treatment tank 4 are arranged in a row from one end in the left-right direction (left end in FIG. 1). It is formed. Regarding the communication state between the respective tanks, as is clear from FIG. 1, the storage tank 1, the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 are in communication with both the liquid phase side and the gas phase side. The sludge settling tank 5 and the aerobic treatment tank 4 are independent of each other. Further, the biogas outlet 31 is formed in the gas phase portion of the upper portion of the anaerobic fermentation tank 3, and the gas generated in the anaerobic fermentation tank 3 is taken out by the biogas extraction passage 37, It does not flow out from this tank to the sludge settling tank 5 and the aerobic treatment tank 4.

  In the following description, the partition wall W12 partitioning the storage tank 1 and the solid-liquid separation tank 2 is a first partition wall W12, and the partition wall W23 partitioning the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 is a second partition Wall W23, partition wall W35 that divides anaerobic fermentation tank 3 and sludge sedimentation tank 5 into third partition wall W35, partition wall W45 that divides sludge sedimentation tank 5 and aerobic treatment tank 4 into fourth partition wall W45 Each may be described.

  In FIG. 2, FIG. 2 (a) is a longitudinal front view of the solid-liquid separation tank 2 and the anaerobic fermentation tank 3, FIG. 2 (b) is a view taken along the line IIb-IIb in FIG. 2 shows a view taken along the line IIc-IIc in FIG. 2 (a), and FIG. 3 shows a cross-sectional plan view of the storage tank 1, the solid-liquid separation tank 2 and the anaerobic fermentation tank 3.

[Storage tank]
As shown in FIGS. 1 to 3, the receiving port 11 is provided in the vicinity of the liquid surface of the storage tank 1 in the waste water treatment apparatus main body A, and the storage space 13 capable of storing garbage waste processing waste liquid inside the storage tank 1. It is formed. In addition, a storage tank aeration apparatus 14 is provided inside the storage space 13 to supply the biogas stored in the biogas tank T as an anaerobic gas by the anaerobic gas pump P1, and aeration agitation is performed from the lower part of the storage tank 1 The apparatus is configured to function as a solubilization tank for achieving more solubilization and fluidization while storing the received garbage crush processing waste solution. Further, in the storage tank 1, foreign matter having a large specific gravity such as metal is removed. An on-off valve V1 and a flow rate adjustment valve V2 are provided in the air supply flow path (not shown) for sending biogas from the biogas tank T to the storage tank aeration apparatus 14, and these on-off valve V1 and flow rate adjustment valve V2 It is possible to adjust the aeration of the aeration from the storage tank aeration device 14 and the adjustment of the aeration amount.

  The upper end of the first partition wall W12 extends close to the ceiling of the drainage treatment apparatus main body A, and is positioned above the liquid surface of the storage tank 1, and the drainage treatment apparatus main body A in the first partition wall W12 Garbage treatment waste was solubilised at one end side (rear end side) of the front and back direction (the direction of the front and back of the sheet with respect to the left and right direction corresponding to the left and right direction of FIG. 1 and FIG. An opening is formed so that the solubilization liquid can be transferred from the storage tank 1 to the solid-liquid separation tank 2 by overflow, and the processing waste liquid transfer part 12 is configured at this opening.

Solid-liquid separation tank
As shown in FIGS. 1 to 3, in the solid-liquid separation tank 2, a precipitation separation space 23 is formed, which enables the solid component to be precipitated and separated from the solubilized liquid received from the processing waste liquid transfer unit 12.
As shown in FIG. 1 and FIG. 2 (a), in the lower part of the solid-liquid separation tank 2, the precipitate from which the solid component is separated in the solid-liquid separation tank 2 is transferred to the anaerobic fermentation tank 3 together with the solubilization liquid A sediment transfer unit 22 is provided which enables the treated wastewater (excess liquid phase) anaerobically treated in the anaerobic fermentation tank 3 to be returned to the solid-liquid separation tank 2.
Furthermore, although a liquid phase transfer unit 21 is provided to transfer the supernatant liquid of the solid-liquid separation tank 2 to the anaerobic fermentation tank 3, regarding the treatment liquid stored in each of the solid-liquid separation tank 2 and the anaerobic fermentation tank 3, A unique configuration is adopted so that the supernatant can flow between the two tanks on the surface side of the treatment liquid.

  As can be seen from FIG. 1 and FIG. 2 (a), in the solid-liquid separation tank 2, a sedimented layer 22c of the precipitate in which solid components are separated is formed in the lower region, and the upper region is solubilized It becomes a liquid supernatant layer. The supernatant layer is in a state where so-called supernatant fluid and floating dust (that is, suspended matter) S are mixed. And, in the waste water treatment apparatus according to the embodiment of the present invention, the constitution for favorably advecting the precipitate to the anaerobic fermentation tank 3 and the advection and transfer of the supernatant liquid to the anaerobic fermentation tank 3 and the aerobic treatment tank 4 are good. The configuration to be performed is adopted.

That is, as shown in FIGS. 1 to 3, the second partition wall which divides the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 into the liquid phase transfer part 21 with the upper end as the minimum water level of the solid-liquid separation tank 2. W23 is provided, and the aeration direction D (indicated by an arrow in FIG. 2 and FIG. 3) from the lower side of the liquid surface of the solid-liquid separation tank 2 on the storage tank 1 side of the liquid phase advection portion 21 As an upper end of the partition wall W23, an air floating device 25 (i.e., air diffusion device) for air floating an anaerobic gas is provided, and the air diffusion region Z1 of the air floating device 25 and the transfer portion M are provided. The suppression mechanism C (refer FIG.2 (b), (c) and FIG. 3) which suppresses the advection of the floating substance S between liquid phase inflow area | region Z2 is provided.
The following will be described in order.

[Advection of sediment to anaerobic fermenter]
As shown in FIG. 1 and FIG. 2 (a), the precipitate advection part 22 is provided with a bottomed slit-like outlet 22a as a throttling part provided in the lower part of the precipitation separation space 23 of the solid-liquid separation tank 2. Is configured. Specifically, the flow-down guide plate 24 extends from a position below the surface of the first partition wall W12 on the solid-liquid separation tank 2 side in a sloping shape in which the downstream guide plate 24 is positioned on the anaerobic fermentation tank 3 side toward the lower side. Yes. Further, the lower portion of the second partition wall W23 is configured as an inclined wall portion 22b which approaches the solid-liquid separation tank 2 side as it goes downward, and the lower end edge of the inclined wall portion 22b and the obliquely upward surface of the flow guiding plate 24. A slit is formed therebetween, and a slit-like outlet 22a is formed by the downstream guide plate 24 and the inclined wall portion 22b at the lower part of the second partition wall W23. Thereby, the advection of the precipitate, the solubilization liquid, and the treated drainage is suppressed via the slit outlet 22a, and the precipitate in the solid-liquid separation tank 2 is deposited by closing the slit outlet 22a. The layer 22c can be formed (see FIG. 2A).

  In the above configuration, the width of the slit-like outlet 22a is about 10-30 mm, preferably about 15 mm.

[Advection and transfer to the anaerobic fermenter and aerobic treatment tank on the supernatant side]
1 and 2, the second partition wall W23 for partitioning the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 includes the inclined wall portion 22b described above in the lower region thereof, and the waste water treatment apparatus main body It is provided so as to extend to both side walls of the drainage treatment apparatus main body A in the front-rear direction of A.
Then, the upper end edge 27 of the second partition wall W23 is positioned below the ceiling of the drainage treatment apparatus main body A, and the upper end edge 27 of the second partition wall W23 corresponds to the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 The liquid phase transfer unit 21 divides the solid-liquid separation tank 2 and the anaerobic fermentation tank 3 with the upper end as the minimum water level of the solid-liquid separation tank 2. A second partition wall W23 is provided. Thereby, the supernatant fluid and the float S between the two tanks are configured to be able to flow over each other beyond the upper end edge 27 of the second partition wall W23 that constitutes the liquid phase advection portion 21.

  Further, a floating material diffuser aeration apparatus 25 (an example of a diffuser) to which an anaerobic gas is supplied by the anaerobic gas pump P1 is provided near the lower side of the liquid surface on the storage tank 1 side of the solid-liquid separation tank 2 ing. The floating material transfer diffuser 25 has a length shorter than the length of the drainage treatment apparatus main body A in the front-rear direction (for example, about 2/3 of the length of the drainage treatment apparatus main body A in the front-rear direction) A large number of air bubbles are dispersedly formed in the length direction to form a pipe shape.

  Then, the pipe-shaped air diffuser 25 for floating material positioning is provided on the surface of the first partition W12 on the solid-liquid separation tank 2 side at a height slightly lower than the upper end edge 27 of the second partition W23. While being close to each other and approaching the end of the waste water treatment apparatus main body A in the front-rear direction of the treatment waste solution transfer portion 12, the length direction thereof is substantially horizontal in the solid-liquid separation tank 2 side of the first partition wall W12. It is arranged in a posture along the surface. Furthermore, the aeration direction D (the direction of each aeration hole) of the floating material aeration aeration device 25 is set obliquely upward toward the upper end edge 27 of the second partition wall W23.

  In other words, in the region above the floating material dispersal diffuser 25 in the liquid phase region of the solid-liquid separation tank 2, the range in which the floating material dispersal diffuser 25 exists in the front-rear direction of the waste water treatment apparatus main body A It becomes the aeration area Z1 of the aeration device 25 for stuffing.

  Then, the floating material S described above is sent from the solid-liquid separation tank 2 to the anaerobic fermentation tank 3 over the upper end edge 27 of the second partition wall W23 by operating the floating material air diffuser 25. be able to. As a result, the floating matter S can be avoided from becoming an inhibition factor of the treatment in the solid-liquid separation tank 2.

Now, as shown in FIGS. 1 to 3, the transfer section M is configured to include a tubular transfer path 6 provided over the solid-liquid separation tank 2 and the aerobic treatment tank 4. The tubular transfer passage 6 has a base end from the upper end edge 27 of the second partition wall W23 in the solid-liquid separation tank 2 while passing through the gas phase zone above the anaerobic fermentation tank 3 and the sludge sedimentation tank 5 respectively. It is located slightly lower and the tip is located in the upper gas phase of the aerobic treatment tank 4.
Since a large amount of biogas is generated in the anaerobic fermentation tank 3 and the gas phase area of the anaerobic fermentation tank 3 and the gas phase area of the solid-liquid separation tank 2 communicate with each other, the gas phase area of the solid-liquid separation tank 2 is The pressure is higher than the gas phase area of the aerobic treatment tank 4.
Therefore, due to the pressure difference between the gas phase area of solid-liquid separation tank 2 and the gas phase area of aerobic treatment tank 4, the supernatant liquid of solid-liquid separation tank 2 is made to flow into tubular transfer path 6 from its proximal end. Then, it can be transferred to the aerobic treatment tank 4 through the tubular transfer path 6.
Here, the entry of the suspended matter S, which has become a problem in the tubular transfer path 6, increases the load of aerobic treatment in the aerobic treatment tank 4.

  Therefore, as can be seen from FIGS. 2 (b), (c) and FIG. 3, the proximal end which is the suction portion (inflow portion) of the tubular transfer path 6 A portion, that is, a portion where the floater air diffuser 25 does not exist is disposed. That is, in the region on the liquid surface side in the liquid phase region of the solid-liquid separation tank 2, a range in which the floating material transfer diffuser 25 on the front side in the front-rear direction of the drainage treatment device main body A does not exist ( In the vicinity of the periphery of the proximal end of the fluid flow path Z2 of the tubular transfer path 6).

  That is, one end side (that is, the waste water treatment apparatus) in the lateral direction of the second partition wall W23 (that is, the front-rear direction of the waste water treatment apparatus main body A) The floating material transfer aeration device 25 is provided between the processing waste solution advection part 12 and the second partition wall W23. The liquid phase inflow area Z2 of the transfer section M is provided on the side of the treatment waste advection section 12 in the lateral direction of the second partition wall W23 with respect to the aeration area Z1 of the floating material aeration diffuser 25 Are provided on the opposite side (i.e., the front end side in the front-rear direction of the waste water treatment apparatus A).

As shown in FIG. 2 and FIG. 3, solid-liquid in a posture in which the porous baffle plate 26 for preventing the advection of the floating matter S is placed along the vertical direction and the horizontal direction of the drainage treatment apparatus main body A. In the separation tank 2, it is disposed between the floater air diffuser 25 and the proximal end of the tubular transfer passage 6 in the front-rear direction of the waste water treatment apparatus main body A.
The baffle plate 26 is provided so as to extend from the ceiling portion of the waste water treatment apparatus main body A to a lower side than the proximal end of the tubular transfer path 6, covering the first partition wall W12 and the second partition wall W23. .
The pore size of the porous baffle plate 26 is set to a diameter that can prevent the passage of the floating matter S, and the baffle mechanism 26 is configured by the baffle plate 26.

That is, the liquid in the solid-liquid separation tank 2 is formed between the aeration area Z1 of the floating material transfer diffuser 25 in the solid-liquid separation tank 2 and the liquid-phase inflow area Z2 of the tubular transfer path 6 It is an example of the descent | fall partition provided so that it may descend | fall to the lower side from a surface.
Further, the baffle plate 26 allows the advection of the liquid phase between the aeration region Z1 of the aeration device for floating material 25 and the liquid phase inflow region Z2 of the tubular transfer path 6, and the advection of the floating matter S. It is an example of the liquid phase advection permissible suppression mechanism to suppress.

Therefore, the floating plate S is prevented from flowing from the aeration zone Z1 to the liquid phase inflow zone Z2 by the baffle plate 26 and the upper end of the first partition wall W12 is higher than the liquid level of the storage tank 1, The floating material S is also prevented from flowing directly from the storage tank 1 into the liquid phase inflow region Z2.
This makes it possible to prevent the float S from being sucked into the tubular transfer path 6.

[Anaerobic fermenter]
As shown in FIG. 1, the anaerobic fermentation tank 3 forms an anaerobic fermentation space 32 which biodegrades the precipitate received from the sediment transfer unit 22 by anaerobic fermentation with methane bacteria in the waste water treatment apparatus main body A. It is configured. The anaerobic fermentation space 32 is provided with a heat exchanger 33 for maintaining the treated water in the anaerobic fermentation space 32 at a good temperature for performing methane fermentation well. The upper space of the anaerobic fermentation space 32 constitutes a biogas collection space 34 for collecting the biogas generated in the anaerobic fermentation space 32. The biogas outlet 31 described above is provided to face the biogas collection space 34.

  In the anaerobic fermentation space 32, an ejector diffuser (ie, advection diffuser) 35 for supplying biogas stored in the biogas tank T as an anaerobic gas by an anaerobic gas pump P1 and a diffuser 36 for circulation are provided. It is provided. An on-off valve V1 and a flow control valve V2 are provided in the air supply flow path (not shown) for sending the biogas from the biogas tank T to the ejector air diffuser 35 and the circulation air diffuser 36 respectively. The adjustment valve V2 is configured to enable / disable the aeration of the aeration from the ejector aeration device 35 and the aeration aeration device 36 and adjust the aeration amount. Then, the anaerobic gas is intermittently diffused by the ejector air diffuser 35 and the circulation air diffuser 36 respectively. That is, the anaerobic gas pump P1, the on-off valve V1 and the flow rate adjustment valve V2 constitute a gas supply device G for intermittently supplying anaerobic gas to the ejector air diffuser 35 and the circulation air diffuser 36.

  As shown by the arrows in FIGS. 1 and 2 (a), the ejector air diffuser 35 is disposed so as to form a gas-liquid multiphase flow rising from below the slit-like outlet 22a. Sediment advection mechanism that allows sediment to be transferred to the anaerobic fermentation tank 3 via the slit outlet 22a and allows the excess liquid phase of the anaerobic fermentation tank 3 to be returned to the solid-liquid separation tank 2 via the slit outlet 22a It is formed. Further, the circulating air diffuser 36 is disposed between the heat exchanger 33 and the third partition wall W 35 on the lower side of the heat exchanger 33 so as to form a circulating flow in the entire anaerobic fermentation tank 3 .

Hereinafter, the operation of the ejector air diffuser 35 and the circulation air diffuser 36 will be described in this order. [Air diffuser for ejector]
The precipitate advection mechanism supplies a large amount of air bubbles at one time by the ejector aeration device 35 from slightly below the slit outlet 22a, so that the ejector effect by the upward flow of the air bubbles causes the solid-liquid separation tank 2 to The precipitate deposited at the slit-like outlet 22a is sucked to the anaerobic fermentation tank 3 side, and the precipitate is transferred. At this time, the precipitate of the deposited layer 22c deposited in the slit-like outlet 22a does not all flow simultaneously simultaneously, but always flows so that the deposit 22c of precipitate is kept in the slit-like outlet 22a. Therefore, even if the precipitate is transferred from the solid-liquid separation tank 2 to the anaerobic fermentation tank 3 via the sediment transfer part 22, the liquid phase in the anaerobic fermentation tank 3 backflows to the solid-liquid separation tank 2 immediately. Although not, it is gradually returned to the solid-liquid separation tank 2 through the deposited layer 22c.

  On the other hand, the solid components in the anaerobic fermentation tank 3 can not be transferred to the solid-liquid separation tank 2 because of being blocked by the sediment layer 22 c. As a result, in the anaerobic fermentation tank 3, the precipitates of the solid-liquid separation tank 2 flow in, but solid components inside the anaerobic fermentation tank 3 are not returned to the solid-liquid separation tank 2, and the inside of the anaerobic fermentation tank 3 Is suppressed from flowing out of the anaerobic fermentation tank 3 and reduced, maintaining good anaerobic fermentation, and maintaining an operating state in which the precipitates corresponding to the volume of solid component reduced by anaerobic fermentation are sequentially replenished be able to.

[Dispersion device for circulation]
As shown in FIG. 1, the anaerobic fermentation space 32 on the sludge sedimentation tank 5 side of the anaerobic fermentation tank 3 is provided with a heat exchanger 33 for maintaining the treated water in this space at a temperature suitable for methane fermentation. It is done. Specifically, the heat exchanger 33 is configured by including a heat medium head 33 h up and down, and a plurality of tubes 33 c through which the heat medium can flow between the pair of heat medium heads 33 h. Therefore, the treatment liquid in the anaerobic fermentation space 32 can be heated by circulating the heat medium from one heat medium head 33 h to the other heat medium head 33 h via the plurality of tubes 33 c.

As can be seen from FIG. 1, the circulating air diffuser 36 is provided between the heat exchanger 33 and the third partition wall W 35 to stir the precipitate present in the anaerobic fermentation space 32 and to Convection is formed, and a configuration capable of maintaining the processing solution of the anaerobic fermentation space 32 at a temperature (for example, 55 ° C.) suitable for anaerobic fermentation by heat exchange with the heat exchanger 33 is employed.
Therefore, in the anaerobic fermentation tank 3, the precipitate can be continuously gasified and reduced in volume by anaerobic fermentation, and biogas can be recovered.

  In the case of the above configuration, the aeration by the ejector aeration device 35 and the circulation aeration device 36 supplies a part of the collected biogas from the biogas tank T with the anaerobic gas pump P1, so the anaerobic fermentation tank The inside of 3 can be maintained in an anaerobic state. In addition, if a large amount of aeration of about 70 L / min is performed for about 20 seconds twice a day, respectively, the advection of the precipitate according to the processing capacity of the anaerobic fermentation tank 3 can be continued, and a large capacity pump etc. It is possible to efficiently transfer the sediment derived from the garbage processing waste without using it.

[Sludge settling tank]
As shown in FIG. 1, a sludge settling tank 5 is provided between the anaerobic fermentation tank 3 and the aerobic treatment tank 4. In the sludge settling tank 5, the sludge and the treatment liquid are returned from the aerobic treatment tank 4 via the first return path 41, and stored from the sludge settling tank 5 via the second return path 51. The sludge and the treatment liquid are returned to the tank 1.

  The first return path 41 supplies air as a pumping gas to the lower part of the vertical pipe portion 41a by the air pump P2, raises the water level in the pipe to the horizontal pipe connection height, and reaches the horizontal pipe connection height Is sent back to the upstream side. An open / close valve V1 and a flow control valve V2 are provided in an air supply flow path (not shown) for sending air to the vertical pipe portion 41a of the first return path 41, and the vertical pipe portion 41a is formed by the open / close valve V1 and the flow control valve V2. It is possible to adjust the interruption of the return of the sludge and the treatment liquid by the first return path 41 and the adjustment of the return amount by performing the interruption of the air supply to and the adjustment of the air supply amount.

  In addition, the second return path 51 supplies the biogas of the biogas tank T as a pumping gas to the lower part of the vertical pipe portion 51a by the anaerobic gas pump P1 to raise the water level in the pipe to the horizontal pipe connection height and connect the horizontal pipe The water to be treated which has reached the height is returned to the upstream side. An on-off valve V1 and a flow control valve V2 are provided in the air supply flow path (not shown) for sending biogas from the biogas tank T to the vertical pipe portion 51a of the second return path 51, and these on-off valve V1 and flow control valve V2 The interruption of the supply of air to the vertical pipe portion 51a and the adjustment of the amount of air supply are configured so that the interruption of the return of sludge and the treatment liquid by the second return passage 51 and the adjustment of the amount of return can be performed.

The sludge settling tank 5 has a configuration in which the sludge settles in the lower part. Then, an air diffusion device 52 for the sludge settling tank is provided which supplies air from the air pump P2 to diffuse the air, and a circulation flow is formed in the tank by the aeration from the air diffusion device 52 for the sludge settling tank It is
Thereby, in the sludge sedimentation tank 5, the sludge and the treatment liquid returned from the aerobic treatment tank 4 through the first return path 41 are further treated aerobically and purified, and the sedimented sludge generated in the sludge sedimentation tank 5 Are returned to the storage tank 1 on the upstream side via the second return path 51, and can be processed again in the anaerobic fermentation tank 3.
In the second return path 51, anaerobic gas is used as the pumping gas, so that the upstream storage tank 1, solid-liquid separation tank 2, and anaerobic fermentation tank 3 can be prevented from being biased aerobically. .

  In the second return path 51, the sludge in the sludge settling tank 5 is returned to the storage tank 1 using anaerobic gas as a pumping gas. Besides, the inside of the sludge settling tank 5 is pumped by a submersible pump. It can also be set as the structure which returns the sludge of this to the storage tank 1. FIG. Furthermore, even when air is used as a pumping gas instead of the anaerobic gas, an air venting path is provided in the second return path 51, and the storage tank 1 side of the second return path 51 is in the water to be treated. A configuration such as submersion can be adopted. Also by this, the liquid phase of the sludge settling tank 5 can be returned to the storage tank 1 while maintaining the situation where air bubbles of the air do not flow into the storage tank 1 and the gas phase on the storage tank 1 side is not released to the atmosphere. . In short, various constitutions are known as the second return path 51 for returning the liquid phase of the sludge settling tank 5 to the storage tank 1 as long as the anaerobic state of the storage tank 1 side (treatment tank of anaerobic environment) is maintained. The configuration can be adopted.

[Aerobic treatment tank]
In the waste water treatment apparatus according to the embodiment of the present invention, the supernatant is transferred from the solid-liquid separation tank 2 to the aerobic treatment tank 4 via the transfer unit M (tubular transfer path 6) and subjected to aerobic treatment. It will be used as a domestic septic tank, etc., which can be purified to the level of water that can be discharged into the natural world and then drained.

  Specifically, the aerobic treatment tank 4 is formed on the opposite side of the storage tank 1 adjacent to the sludge settling tank 5 inside the waste water treatment apparatus main body A. Then, a tubular transfer path 6 is provided between the solid-liquid separation tank 2 and the aerobic treatment tank 4 so that the supernatant liquid transferred to the aerobic treatment tank 4 is further purified and discharged from the drainage port 42. It is configured.

A large number of sponge-like carriers 43 are accommodated in the aerobic treatment tank 4. In addition, the aeration device 44 for aerobic treatment tank that supplies air by aeration pump P2 to aerate is internally provided, and air is supplied from the aeration device 44 for aerobic treatment tank to the carrier 43 of the aerobic treatment tank. In addition to growing aerobic bacteria that aerobically treats the solution in 4, the carrier 43 is configured to be able to form a circulating flow in which the fluidized bed is formed in the tank.
In addition, a porous solid content shielding body 45 is provided in the vicinity of the drainage port 42 to suppress the mixing of solid components into the treated waste water to be discharged, and clean supernatant liquid containing no solid component is discharged. It is as composition.

Next, based on FIG. 4, the load of aerobic treatment in aerobic treatment tank 4 is adopted by adopting the above-described transfer configuration of the supernatant liquid from solid-liquid separation tank 2 to aerobic treatment tank 4. We will explain the results of verifying that we can reduce
Note that FIG. 4 shows the supernatant liquid transferred from the solid-liquid separation tank 2 to the aerobic treatment tank 4 (hereinafter sometimes referred to as influent water) and the waste water discharged from the aerobic treatment tank 4 respectively. COD (mg / L) is shown for each treatment day, the horizontal axis of FIG. 4 shows the date of waste water treatment, and the vertical axis shows T-COD.
In FIG. 4, a configuration is adopted in which the floating material re-arranging air diffuser 25 works from July 12 (7/12) indicated by a vertical line.

Before adopting the configuration of the embodiment of the present invention, the average of T-COD of influent water and drainage was 48000 mg / L and 14000 mg / L, respectively.
On the other hand, after adopting the configuration of the embodiment of the present invention, the average of T-COD of influent water and waste water was 23000 mg / L and 7200 mg / L, respectively.
Therefore, by adopting the configuration of the embodiment of the present invention, the load of aerobic treatment in the aerobic treatment tank 4 can be reduced, and the cleanliness of the drainage can be improved.

[Another embodiment]
Next, another embodiment will be described.
(1) The specific configuration of the transfer section M is not limited to the tubular transfer path 6 exemplified in the above embodiment.
For example, while the solid-liquid separation tank 2 and the aerobic treatment tank 4 are provided adjacent to each other in a partitioned state by the partition wall, the supernatant of the liquid phase from the solid-liquid separation tank 2 overflows the upper end of the partition wall The transfer unit M may be configured as an overflow-like transfer unit at the upper end of the partition wall so as to be transferred to the aerobic treatment tank 4.

(2) The specific configuration of the suppression mechanism C is not limited to the porous baffle plate 26 exemplified in the above embodiment, and may be a plate having no hole.

(3) In the above configuration, the inlet 11 is provided on one end side of the drainage treatment apparatus main body A, and the outlet 42 is provided on the other end, and the direction from the inlet 11 to the outlet 42 Storage tank 1, solid-liquid separation tank 2, anaerobic fermentation tank 3, sludge sedimentation tank 5, and aerobic treatment tank 4 are arranged in this order in order to treat waste water. When the waste water containing the garbage waste treatment waste is large, the tubular transfer path 6, which transfers the waste water between each water treatment tank as the volume of the waste water treatment apparatus A itself is set large, the return means There is a tendency for the ducts forming R and the like to become longer. Specifically, for example, the tubular transfer path 6 needs to be formed in a length extending from the liquid phase of the solid-liquid separation tank 2 to the aerobic treatment tank 4 across the anaerobic fermentation tank 3, but the anaerobic fermentation tank 3 The tube itself is most likely to be enlarged depending on the displacement, and the tubular transfer path 6 is lengthened accordingly. In such a case, although the tubular transfer path 6 transfers the supernatant liquid of the solid-liquid separation tank 2, it may unavoidably transfer and transport the slight float S together with the supernatant liquid. Therefore, there is a concern that the suspended matter S may be attached to the tubular transfer path 6 during long-term use to inhibit the transfer of the supernatant. Therefore, in such a case, it is desirable to make the tubular transfer path 6 as compact as possible.

  Therefore, as shown in FIG. 5, the storage tank 1, the solid-liquid separation tank 2, the anaerobic fermentation tank 3, the sludge sedimentation tank 5, and the aerobic treatment tank 4 are arranged in this order in the longitudinal direction in the waste water treatment apparatus main body A. The receiving port 11 is provided near the central portion in the longitudinal direction of the drainage treatment apparatus main body A, and the storage tank 1 is provided in the central portion in the longitudinal direction of the drainage treatment apparatus main body A. A solid-liquid separation tank 2 and an anaerobic fermentation tank 3 are provided in this order toward the one end side (upper side), and a sludge settling tank 5 and an aerobic treatment tank are sequentially arranged toward the other side (lower side) than the storage tank 1 4 can be juxtaposed in this order.

  When configured in this manner, when the waste water containing the waste crush processing waste fluid flows into the inside of the waste water treatment apparatus main body A from the receiving port 11, the waste water flows into the storage tank 1 in the longitudinal central portion of the waste water treatment apparatus main body A The precipitate is separated and fluidized with the progress of anaerobic digestion. Then, it is transferred to the upper side, flows into the solid-liquid separation tank 2, and after solid-liquid separation, the precipitate flows into the anaerobic fermentation tank 3, is methane fermented, and is biogasified. On the other hand, the supernatant liquid separated in solid and liquid is transferred to the lower side by the tubular transfer path 6 and subjected to aerobic treatment in the aerobic treatment tank 4, and the cleaned drainage is discharged from the drainage port 42. After the precipitated sludge generated by the aerobic biological treatment is concentrated in the sludge settling tank 5, it can be returned to the storage tank 1.

  Then, the tubular transfer path 6 can transfer the liquid phase of the solid-liquid separation tank 2 to the aerobic treatment tank 4 without straddling the anaerobic fermentation tank 3, and can be made compact, and can be used for a long time It is possible to greatly reduce the possibility of the narrowing or blockage of the flow path due to the attachment of the float S. Moreover, since the anaerobic fermentation tank 3 is disposed on the most advanced side of the wastewater treatment apparatus main body A and the aerobic treatment tank 4 is disposed on the most downstream side of the wastewater treatment apparatus main body A, the high temperature in the anaerobic fermentation tank 3 The solid-liquid separation tank 2 and the storage tank 1 shield and relieve that the heat supplied when performing methane fermentation is transmitted to the sludge settling tank 5 and the aerobic treatment tank 4. While the amount of energy supply required to heat and maintain the separation tank 2 to a temperature range of 50 ° C. to 80 ° C. (for example, 55 ° C.) suitable for high temperature methane fermentation can be reduced, the drainage temperature in the aerobic treatment tank 4 becomes high. It is possible to maintain a temperature range (for example, about 30 ° C.) which is less likely to cause problems such as too low (for example, 35 ° C. or more) and a decrease in the activity of aerobic microorganisms.

  Specifically, the outer peripheral wall portion corresponding to the storage tank 1, the solid-liquid separation tank 2, and the anaerobic fermentation tank 3 in the waste water treatment apparatus main body A is thermally insulated as a heat insulation structure, and the sludge sedimentation tank 5 and the aerobic treatment tank 4 are provided. In the embodiment of FIG. 1 when the corresponding outer peripheral wall portion has a non-insulating structure, when the anaerobic fermentation tank 3 is maintained at 55 ° C., the temperature of the storage tank 1 adjacent to the solid-liquid separation tank is 48 ° C. In the case of the configuration shown in FIG. 5, when the anaerobic fermentation tank 3 is maintained at 55 ° C., the temperature of the storage tank 1 is 40 ° C. and the temperature of the aerobic treatment tank 4 is 32 ° C. It is expected that a suitable water treatment environment can be maintained.

(4) Further, in the above configuration, the solid-liquid separation tank 2 and the aerobic treatment tank 4 and the transfer unit M directly transfer the liquid phase separated in the solid-liquid separation tank 2 to the aerobic treatment tank 4. Although the tubular transfer path 6 provided across it was comprised, as shown to FIG. 6, FIG. 7, it can also comprise.

  That is, the tubular transfer passage 6 is provided so as to extend between the solid-liquid separation tank 2 and the sludge sedimentation tank 5. Further, the upper end portion of the partition wall W45 is set in the vicinity of the liquid surface height between the solid-liquid separation tank 2 and the sludge sedimentation tank 5, and from the sludge sedimentation tank 5 aerobically via the upper end portion of the partition wall W45. An overflow portion 6a is formed in the processing tank 4 to cause the supernatant to overflow. Then, a transfer unit M is configured from a tubular transfer path 6 provided over the solid-liquid separation tank 2 and the sludge sedimentation tank 5 and an overflow part 6 a that causes the supernatant to overflow from the sludge sedimentation tank 5 to the aerobic treatment tank 4. .

  Thereby, the liquid phase solid-liquid separated in solid-liquid separation tank 2 is subjected to aerobic treatment well, and supernatant liquid after precipitation separation of sludge in sludge sedimentation tank 5 can also be simply aerobically treated again Can be Further, by configuring in this manner, the tubular transfer passage 6 can be made more compact, and the possibility of causing narrowing or blockage of the transfer passage of the liquid phase due to adhesion of suspended matters during long-term use can be greatly reduced. become.

(5) Further, in the above configuration, the sludge settling tank 5 and the aerobic treatment tank 4 are provided separately, but as shown in FIG. 8, the aerobic treatment of the supernatant liquid generated in the sludge settling tank 5 In order to promote advection to the tank 4, an overflow portion 6 a may be provided between the sludge settling tank 5 and the aerobic treatment tank 4 and communicated. In this case, the sludge and the treatment liquid are returned from the aerobic treatment tank 4 to the sludge sedimentation tank 5 through the first return path 41, the sludge is sedimented in the sludge sedimentation tank 5, and the treatment liquid is overflowed by the overflow. While flowing into the treatment tank 4, the sludge is returned from the sludge settling tank 5 to the storage tank 1 via the second return path 51. Therefore, there is an advantage that the return processing of the sludge and the processing liquid from the aerobic treatment tank 4 and the sludge return processing from the sludge settling tank 5 to the storage tank 1 can be performed steadily and stably.

  As described above, it is possible to provide a waste water treatment apparatus capable of improving the cleanliness of the waste water to be purified and discharged.

1 Storage tank (receiving part)
2 Solid-liquid separation tank 3 Anaerobic fermentation tank 4 Aerobic treatment tank 5 Sludge settling tank 6 Tubular transfer path 12 Treated waste solution advection part 21 Liquid phase advection part 22 Sediment advection part 22a Slit shaped outlet (shrinkage part)
22c Sedimentary layer 25 Aeration device for floating material collection (aeration device)
26 Baffle plate (downward partition, liquid phase advection permissible suppression mechanism)
35 Ejector aeration device (advertising aeration device)
41 first return passage 51 second return passage C suppression mechanism D aeration direction G gas supply device M transfer unit R return means S floating matter W23 second partition wall (partition wall)
Z1 aeration zone Z2 liquid phase inflow zone

Claims (11)

It has a receiving unit for receiving garbage waste treatment wastes,
A solid-liquid separation tank for transferring the garbage waste treatment waste solution from the receiving part to transfer the waste material waste treatment waste liquid;
It has an aerobic treatment tank for receiving and aerobically treating the liquid phase separated in the solid-liquid separation tank,
And an anaerobic fermenter for receiving and biogasifying the precipitate separated in the solid-liquid separation tank,
Providing a transfer unit for transferring a liquid phase from the solid-liquid separation tank to the aerobic treatment tank;
A waste water treatment apparatus comprising a return means for returning the precipitate separated in the aerobic treatment tank to the receiving part,
A liquid phase advection section for advecting a liquid phase from the solid-liquid separation tank to the anaerobic fermentation tank, and a sediment advection section for advecting the precipitate in a lower part of the solid-liquid separation tank ,
The upper end as the lowest water level height of the solid-liquid separation tank, so as to partition the the solid-liquid separation tank and the anaerobic fermentation tank, provided with a partition wall upper end edge is the liquid phase advection part, said liquid phase A diffuser is provided on the receiving part side of the advection part, from the liquid surface of the solid-liquid separation tank or near the liquid surface, with an aeration direction as the upper end of the partition wall, for diffusing the anaerobic gas.
The waste water treatment apparatus which provided the control mechanism which controls the advection of the floating matter between the aeration area of the above-mentioned aeration device, and the liquid phase inflow area of the above-mentioned transfer part. A sludge settling tank for receiving the sediment separated in the aerobic treatment tank,
The return means comprises a first return path for returning precipitates from the aerobic treatment tank to the sludge settling tank, and a second return path for returning precipitates from the sludge settling tank to the receiving portion. And
The waste water treatment apparatus according to claim 1, wherein the carrier gas in at least the second return path is an anaerobic gas.   The waste water treatment apparatus according to claim 2, wherein the transfer unit transfers the liquid phase separated in solid-liquid separation in the solid-liquid separation tank to the aerobic treatment tank via the sludge sedimentation tank. The processing waste liquid advection part for transferring the garbage waste processing waste liquid from the receiving part to the solid / liquid separation tank is moved to the side corresponding to one end side in the lateral direction of the dividing wall in a state of facing the dividing wall. Provided
The aeration device is provided between the processing waste solution advection unit and the partition wall, and is provided near the processing waste solution advection unit side.
The liquid phase inflow area of the transfer section is provided on the side corresponding to the side opposite to the processing waste solution advection section side in the lateral direction of the partition wall with respect to the aeration area of the aeration device. The waste water treatment apparatus of any one of 1-3.   The reduction mechanism is a descent partition provided so as to descend below the liquid surface of the solid-liquid separation tank, between the aeration area and the liquid phase inflow area in the solid-liquid separation tank. The waste water treatment apparatus of any one of -4.   The drainage according to claim 5, wherein the suppression mechanism is a liquid phase advection permissible suppression mechanism that allows the advection of the liquid phase between the aeration area and the liquid phase inflow area and suppresses the advection of the floating matter. Processing unit. The transfer unit includes a tubular transfer path provided between the solid-liquid separation tank and the aerobic treatment tank,
The proximal end of the said tubular transfer path is arrange | positioned by the liquid surface side part in the liquid phase of the said solid-liquid separation tank, and the periphery vicinity of the said proximal end is made into the said liquid phase inflow area | region. The waste water treatment apparatus according to any one of the preceding claims. In the precipitate transfer part, the space between the solid-liquid separation tank and the anaerobic fermentation tank is closed by the precipitate so that the backflow from the anaerobic fermentation tank to the solid-liquid separation tank can be prevented. While providing a diaphragm,
A sediment advection mechanism is provided to transfer the precipitate to the anaerobic fermentation tank through the narrowing section, and to allow the excess liquid phase of the anaerobic fermentation tank to be returned to the solid-liquid separation tank through the narrowing section. The waste water treatment apparatus of any one of Claims 1-7.   The narrowing portion includes a slit-like outlet provided in the lower part of the solid-liquid separation tank, and the deposit in the solid-liquid separation tank is capable of forming a deposited layer which blocks the slit-like outlet and deposits. The wastewater treatment device according to claim 8.   The anaerobic fermentation tank is provided with an advection aeration device for aeration of an anaerobic gas, the advection aeration device is provided with a gas supply device for intermittently supplying the anaerobic gas, and the air rising from below the slit-like outlet 10. The waste water treatment apparatus according to claim 9, wherein the sediment advection mechanism is formed so as to be capable of forming a liquid multiphase flow. Internal partitions into a plurality of water treatment tanks for the other end from one end of the anaerobic fermenter of the plurality of water treatment tanks from one end, the solid-liquid separation tank, storage tank as the receiving section, the aerobic The wastewater treatment apparatus according to any one of claims 1 to 10, wherein a sludge settling tank for receiving the sediment separated in the treatment tank and the aerobic treatment tank are provided in this order.

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