JPH1119674A - Organic waste water treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device to perform an effective treatment, to eliminate a short circuit and to prevent clogging by providing the multilayered construction of a packed layer and an auxiliary layer and further providing the both layers in a plurality. SOLUTION: First treated water is introduced to a second treating tank 30. The second treating tank 30 is composed of the multilayered structure of packed layers 34 (34a, 34b, 34c and 34d) and foamed glass layers 36 (36a, 36b, 36c and 36d). Then, air is supplied to the foamed glass layers 36 (36a, 36b, 36c and 36d). In this way, the packed layers 34 (34a, 34b, 34c and 34d) are kept in an aerobic condition and a good aerobic biological treatment is executed here to the permeated treated water of a first treating tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic wastewater treatment apparatus for treating organic wastewater, and more particularly to an apparatus using a packed bed filled with a microorganism carrier.

[0002]

2. Description of the Related Art Conventionally, a treatment using an aerobic microorganism has been widely used for treating organic wastewater. For example, activated sludge method is usually adopted in sewage treatment plants,
In the combined type septic tank, the activated sludge method and the immersion filter bed method are adopted.

Here, garbage discharged from homes and the like is separated and collected, and incinerated at a garbage incineration plant. However, with such a conventional disposal method, the labor and burden involved in transporting, collecting, and treating garbage are large, and incineration is not preferable from the viewpoint of effective use of resources and protection of the global environment. On the other hand, a disposer for crushing garbage has been conventionally known, and by using this disposer, garbage can be transported as wastewater. Therefore, the user does not need to collect garbage, which is very convenient. However, when this disposer is used, there is a problem that the concentration of solids and organic matter in the wastewater becomes extremely high, so that the sewer pipe is easily clogged and the load on the septic tank and the sewage treatment facility becomes too large.

Further, there has been proposed an apparatus for treating wastewater containing crushed garbage in a home or an apartment house using the disposer. According to this device, a disposer can be used in each home, and there is no adverse effect on sewerage and the like.

For example, Japanese Patent Application Laid-Open No. 9-1117 discloses that
An apparatus for treating garbage-containing wastewater containing garbage crushed by such a disposer is shown. In this apparatus, garbage-containing wastewater flows into a solid processing section, where solids are decomposed and removed. Then, the primary treated water obtained in the solid processing section is introduced into a wastewater treatment tank, where it is subjected to aeration treatment. In this way, solid matter can be removed and aerobic biological treatment can be performed on wastewater containing garbage crushed by the disposer.

[0006]

Here, in this device, aeration treatment is performed by a diffuser in a wastewater treatment tank.
Aerated water is discharged as treated water. Therefore, basically, the same treatment as the activated sludge method is performed. But,
The wastewater treatment tank described in this publication does not have a sedimentation tank large enough to settle the aeration mixture, and when the suspended solids concentration (MLSS) of the aeration mixture increases,
Sufficient processing cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an organic wastewater treatment apparatus capable of effectively treating organic wastewater such as primary wastewater containing garbage from a disposer. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an organic wastewater treatment apparatus for treating organic wastewater, which is filled with a microorganism carrier, filters the supplied wastewater, and performs aerobic biological treatment. A bed, an auxiliary layer for inserting wastewater discharged through the packed bed, and an air supply member for diffusing air or oxygen gas into the packed bed, and discharging treated water from the auxiliary bed. And

The auxiliary layer has a function of promoting drainage from the packed bed.

Thus, the organic wastewater is supplied to the packed bed where it is brought into contact with the filler. Further, air is supplied to this packed bed, and the packed bed is maintained in an aerobic state. Therefore, in the packed bed, aerobic microorganisms adhere to and propagate on the filler, and the aerobic microorganisms oxidize and remove organic substances in the organic wastewater. In particular, since the wastewater is circulated through the packed bed and air is supplied to the inside, sufficient oxygen is supplied, and suitable oxidative decomposition of organic substances by aerobic microorganisms is achieved.

Further, since the treated water is discharged from the auxiliary layer, the treated water from the packed bed can be smoothly discharged to the outside. In other words, if the packed bed has high water retention (relatively poor water permeability), it is difficult to discharge the treated water to the outside, and the treated water cannot be discharged from the packed bed. Cheap. However, a material having better water permeability than the packed layer can be used as the auxiliary layer. by this,
It is possible to provide a packed layer providing an intermediate atmosphere between the packed layer and the outside, and it is possible to smoothly discharge treated water from the packed layer. In particular, by providing the auxiliary layer below and adjacent to the packed bed, it is possible to smoothly discharge the treated water from the packed bed.

Further, the present invention is characterized in that it has a multi-stage structure in which a plurality of the above-mentioned filling layers and the above-mentioned auxiliary layers are alternately laminated.
By providing a plurality of stages, short-circuiting of the water to be treated can be prevented, and the downward movement of the water to be treated can be made smooth.

An air supply member for supplying air or oxygen gas to the plurality of auxiliary layers is provided, and air is diffused from the air supply member. In this way, all of the multi-stage packed layers can be effectively kept aerobic. In addition, the auxiliary layer can also function as an air diffusion member, and can diffuse air throughout the packed layer.

Further, the present invention is characterized in that air or oxygen gas is forcibly supplied to the packed bed. Such forced aeration ensures that the packed bed is maintained in an aerobic state.

Further, the auxiliary layer is characterized in that it is made of a material having water permeability and water permeability. Thereby, the transfer of the processing liquid from the packed layer to the auxiliary layer becomes smooth. In addition, microorganisms are retained in the auxiliary layer, and BOD is further oxidized and removed.

Further, the average water permeability of the auxiliary layer is better than the average water permeability of the packed layer. In this way, by interposing the auxiliary layer having better water permeability than the packed layer between the packed layer and the outside, the processing liquid from the packed layer can be smoothly discharged to the outside. That is, it is difficult for the treatment liquid to be discharged to the outside from the packed layer having relatively poor water permeability (high water retention) due to surface tension and the like. Therefore, the treatment liquid from the packed bed cannot be discharged well, and decay clogging is likely to occur here. However, by providing the auxiliary layer that provides an intermediate atmosphere between the filling layer and the outside, it is possible to smoothly discharge the processing liquid to the outside.

Further, the auxiliary layer is made of a porous material. By making it porous, the water retention can be made predetermined. Here, the porous means at least a part of the surface, preferably substantially the entire surface,
More preferably, it means that the whole is porous.

Further, the auxiliary layer is made of a granular material. By using the granular material, it becomes easy to set the water permeability and the like to a predetermined value.

Further, the auxiliary layer is made of foamed glass. Foamed glass has better water permeability (lower water retention) than microbial carriers such as wood chips, and is very suitable as a material for an auxiliary layer for receiving a treatment liquid from a packed layer and discharging it to the outside. Furthermore, the foamed glass can hold an appropriate amount of microorganisms without causing clogging, and can remove BOD components (particularly soluble BOD components) remaining in the treatment liquid from the packed bed.

A clogging prevention layer made of a wood chip having a large particle size is disposed on the uppermost packing layer in a multi-stage structure in which a plurality of packing layers and auxiliary layers are laminated to prevent clogging on the surface. It is preferable to dispose a coarse fibrous component layer below the lowermost auxiliary layer to promote drainage.

Further, the microorganism carrier of the packed bed is a wood chip. Wood chips are inexpensive, porous and water-absorbing. Therefore, it is suitable as a carrier for microorganisms. Therefore, by filling the wood chips in the filling layer, aerobic microorganisms that oxidatively decompose organic substances can be sufficiently retained here, and suitable decomposition of organic substances can be achieved.

Further, the organic wastewater to be treated is a primary treated water obtained by subjecting wastewater containing garbage from a disposer to a filtration treatment and an aerobic biological treatment in a primary treatment device. . The disposer crushes household garbage and contains a large amount of organic matter. Therefore, when processing this, it is more efficient to separate and process relatively large solids. Therefore, the primary treated water from which a relatively large SS component has been removed together with some soluble organic substances by a filtration layer such as a wood chip is an organic wastewater containing many organic substances. Such organic wastewater is effectively treated by the organic wastewater treatment device of the present invention.

Further, the organic wastewater to be treated further includes kitchen wastewater. By flowing in the kitchen wastewater, the kitchen wastewater can be treated, and the total organic matter discharge amount of the wastewater discharged from a home or the like can be reduced.

The present invention is also an organic wastewater treatment apparatus for treating organic wastewater, wherein the wastewater is supplied with a wood chip filled as a microbial carrier and filtered.
It is characterized by having a packed layer for aerobic biological treatment.

Further, it is preferable that the temperature of at least the packed bed in the primary treatment device and the secondary treatment device is maintained at about 30 ° C. or higher. Thereby, the activity of the aerobic microorganisms in the packed bed is maintained at a sufficient level, and effective treatment can be performed. For this heating, a heater or the like that is turned on when the temperature is lowered is preferable.

Further, the auxiliary layer has a two-layer structure, and is characterized in that a layer farther from a layer closer to the filling layer of the auxiliary layer has better water permeability. .
As described above, by making the auxiliary layer a multilayer, the change in the atmosphere can be further gradually changed, and a smoother discharge of the permeation treatment liquid can be achieved.

In the case where the number of the auxiliary layer is one, the auxiliary layer thereof is provided, and in the case of a plurality of the auxiliary layers, the auxiliary layer on the last treatment water discharge side has at least a two-layer structure. It is characterized in that the layer farther than the layer closer to has better water permeability. With such a configuration, it is possible to effectively discharge the treated water.

Further, by increasing the porosity of the layer farther from the layer closer to the filling layer of the auxiliary layer, the water permeability of the layer farther away is improved. Depending on the porosity,
Water permeability can be easily set.

The lowermost auxiliary layer of the auxiliary layers has a structure in which the porosity gradually increases from a portion closer to the filler layer to a portion farther from the filler layer. As described above, by gradually changing the porosity in one layer, the permeation treatment liquid can be similarly smoothly discharged.

Further, the layer of the auxiliary layer, which is farther from the filling layer, is characterized in that it is composed of a fibrous structure formed by entanglement of a large number of fibers. The fibrous component has a high porosity and good water permeability. Therefore, the inside of the auxiliary layer can be configured to gradually improve water permeability, and the treatment liquid can be discharged very smoothly.

In this case, it is preferable that the layer close to the packed layer is formed of granular material and the layer farther (the treated water discharge side) is formed of fibrous material. Further, foamed glass is suitable as the granular material. In addition, in the auxiliary layer other than the rearmost auxiliary layer, it is also preferable that the intermediate portion (intermediate layer) of the auxiliary layer has a higher porosity than both side portions (upper and lower layers).

[0032] The microbial carrier of the packed bed is characterized in that its particle size is comprised between 2 and 5 mm. Increasing the particle size of a microbial carrier such as a wood chip improves drainage and makes clogging less likely to occur. However, if the particle size is too large, the effect of the treatment is reduced. This makes it possible to achieve long-term continuous treatment while maintaining the properties of the treated water at a sufficient level.

[0033]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of a solid organic matter-containing wastewater treatment apparatus according to an embodiment of the present invention. In the apparatus of this embodiment, garbage-containing wastewater is treated as solid organic matter-containing wastewater. Disposers are provided at drains of household sinks, and garbage is crushed by the disposers. During use of the disposer, tap water is allowed to flow, and crushed garbage flows through the drainpipe while being dispersed in the water. In addition, when this apparatus is provided immediately below each household sink, a drain pipe is not required. The garbage-containing wastewater containing the crushed garbage flows into the first treatment tank 10 functioning as a primary treatment device. In addition, if it is the wastewater of the same property as such a garbage containing wastewater, the apparatus of this embodiment can perform suitable processing.

As shown in FIGS. 1 and 2, the first processing tank 10 has a rectangular container 12 having a hopper-shaped lower part and an upper part opened. Then, a filling layer 14 is formed inside the container 12. This filling layer 14
Is filled with wood chips such as cedar sawdust and has a particle size of several mm (1.5 m in this embodiment).
m). Note that a porous plastic, a porous glass material, a mesh material, or the like may be used as long as a solid organic substance can be filtered, water can be retained, and microorganisms that decompose the organic substance are easily attached and grow. Further, by forming the filling layer 14 with a wood chip, a biodegradable plastic, or the like, it becomes possible to use this as compost when discarding. The filling layer 14 has a thickness of, for example, about 15 cm.

Under the filling layer 14, the foamed glass layer 1 functioning as an auxiliary layer (supporting layer for supporting the filling layer 14) is formed.
6 are provided. The foam glass layer 16 is formed by filling granular foam glass. Here, the particle diameter of the granular foam glass is about 5 mm, and the particle diameter is set to be larger than that of the wood chips forming the filling layer 14.
Therefore, the porosity of the foamed glass layer 16 is
Larger than. In addition, this granular foamed glass is obtained by crushing natural glass-based rock and firing and foaming at high temperature.
Those used as materials for preventing root rot of plants and improving soil are suitable. The foam glass layer 16 has a thickness of, for example, about 10 cm.

Below the foam glass layer 16, there is provided a fibrous component layer 18 which also functions as an auxiliary layer.
The fibrous constituent layer 18 has a greater roughness than the foamed glass layer 16 and has a higher porosity.
As the fibrous constituent layer 18, a mat-like one formed by entanglement of hard plastic fibers having a wire diameter of about 0.5 mm is employed. For example, among mat materials used as a filtering material for water in an aquarium of an aquarium fish, coarse mat materials and the like are preferable.

Below the fibrous material layer 18, a corrugated sheet material 20 for collecting and discharging the primary processing liquid is provided. This corrugated sheet material 20 is arranged toward the drain port 22,
Drainage is easy to flow downward. The fibrous constituent layer 18 has a thickness of, for example, about 2 to 3 cm.
This corrugated sheet material 20 may be considered as a part of the auxiliary layer.

Further, the bottom of the container 12 has a constant depth in the longitudinal direction, and a drain port 22 is provided at the bottom. Note that the container 12 may be slightly inclined in the longitudinal direction, and the drainage port 22 may be arranged at the lowest part.

Further, a plowing device 24 is provided in the surface portion of the filling layer 14 for plowing the same. In this embodiment, a paddle-shaped device is shown as the plowing device 24. The turning device 24 may rotate or may reciprocate. The plowing device 24 may be of any type, such as a device that moves while pressing a rake-like or comb-shaped device against the surface layer so that the surface layer portion is not hardened.

When garbage-containing wastewater flows into the first treatment tank 10, crushed garbage, which is a solid content, is filtered and separated by the packed bed 14. On the other hand, the liquid component passes through the filling layer 14, the foam glass layer 16, and the fibrous constituent layer 18. Then, the processing liquid that has passed through the fibrous constituent layer 18 flows through the valley of the corrugated sheet material 20 and reaches the center, and the processing liquid is dropped and stored in the reserve tank 26 below the drainage port 22. You.

Further, compressed air is supplied from an air pump 28 to the reserve tank 26, and the primary processing liquid stored in the first processing tank 10 is aerated here. You. Thereby, it can prevent that it rots in the reserve tank 26.

Here, the filling material of the filling layer 14 is a wood chip, and is a porous material having a water absorbing ability and a large surface area. Further, since there is a gap between the particles, the inside of the filling layer 14 is maintained in an aerobic state. Moreover, the solid matter filtered and separated in the packed bed 14 and the organic matter in the liquid component are rich in organic matter in the packed bed 14. Therefore, the filler functions as a microorganism carrier, and aerobic microorganisms propagate in the filling layer 14. Therefore, the solid matter (crushed garbage) separated and held in the packed bed 14 and the soluble BOD component in contact with the filler are decomposed by the aerobic microorganisms. In particular, a wood chip is very suitable as a carrier for microorganisms.
4, a sufficient amount of microorganisms can be retained, and thus sufficient treatment can be performed.

In particular, the first processing tank 10 of the present embodiment has a foam glass layer 16 made of granular foam glass below the filling layer 14. The granular foam glass of the foam glass layer 16 is porous like the wood chips of the filling layer 14, but the particle size is set to be larger than that of the wood chips. When such a filling layer 14 and a foam glass layer 16 are laminated, the difference in atmosphere between the two layers is relatively small. Therefore, the liquid component that has descended by gravity in the filling layer 14 moves smoothly to the foam glass layer 16. Therefore, it is possible to effectively prevent clogging from occurring in the lower portion of the filling layer 14. In particular, the packed layer 1 of the present embodiment
No. 4 has a large flat area and is shallow. Therefore, the liquid is smoothly discharged downward. Furthermore, since an appropriate amount of microorganisms is also held in the foam glass layer 16, the soluble BOD can be further removed here while maintaining sufficient water permeability.

For example, when the filling layer 14 is directly supported, the atmosphere after the filling layer 14 of the wood chip is, and at this interface, it is difficult for the liquid component to escape from the filling layer 14 due to the surface tension of water. Then, a region having high moisture is generated at the bottom of the filling layer 14. And in such an area, it becomes anaerobic and rot occurs, and clogging is further promoted. According to the present embodiment, such disadvantages can be eliminated.

Further, in the present embodiment, a fibrous component layer 18 made of a fibrous mat material is provided below the foamed glass layer 16. This fibrous component layer 18 is also a porous layer and contacts the foamed glass layer 16 to a considerable extent. Therefore, the movement of the liquid here is also smooth.

Then, since the liquid component from the fibrous constituent layer 18 is discharged to the outside via the corrugated sheet member 20, the liquid component here is also smoothly moved. As described above, according to the first processing tank of the present embodiment, the downward movement of the liquid is very smooth as a whole. For this reason, it is possible to suppress the generation of a region having a high water content at the bottom of the filling layer 14, and it is possible to effectively prevent rot and clogging from occurring here. Then, the BOD component is effectively removed by the aerobic microorganisms growing on the filling layer 14 and the foam glass layer 16. Therefore, the solid organic matter-containing wastewater containing the crushed garbage discharged from the disposer can be effectively treated for a long period of time.

The reversing device 24 scrapes the surface of the filling layer 14 in order to prevent clogging of the surface, and does not stir and mix the entire filling layer 14. The reversing device 24 can prevent clogging of the surface layer and promote the downward movement of the liquid component and the ventilation from the surface.

If an air supply member is attached to the first treatment tank 10, aerobic decomposition can be promoted and the water content (40-80%) suitable for solid matter decomposition can be adjusted, and clogging can be prevented. Useful.

In this way, the primary processing liquid processed in the first processing tank 10 is stored in the reserve tank 26. Then, in the apparatus of the present embodiment, the first processing tank 30 functioning as the secondary processing apparatus includes the first processing tank 30.
The primary processing liquid of the processing tank 10 is further processed.

As shown in FIGS. 1 and 3, the second processing tank 30 of this embodiment has a four-layer structure in which a plurality of packing layers 34 are stacked in a cylindrical container 32. A foam glass layer 36 functioning as an auxiliary layer is disposed below 34. That is, a first layer composed of the first filling layer 34a and the first foamed glass layer 36a, a second layer composed of the second filling layer 34b and the second foamed glass layer 36b, and a third layer 3
It comprises a third layer composed of 4c and third foamed glass layer 36c, and a fourth layer composed of fourth filled layer 34d and fourth foamed glass layer 36d. Here, the same wood chips as the filling layer 14 of the first treatment tank 10 are filled in the filling layer 34. The foamed glass layer 36 is filled with the same granular foamed glass as the foamed glass layer 16.

The first, second, third, and fourth foamed glass layers 36a, 3a
An air pipe 38 is connected to each of the air pipes 6b, 36c, and 36d.
It is connected to the. Therefore, the compressed air from the air pump 28 is supplied to each filling layer 34 via each foam glass layer 36.

A water pump 40 is provided above the container 32.
The primary processing liquid supply pipe 42 connected to the reserve tank 26 is opened through the opening, and the primary processing liquid in the reserve tank 26 is supplied to the first filling layer 34a from above.
In addition, a drain pipe 44 is connected to the bottom of the container 32, from which treated water is discharged.

Further, the second processing liquid supply pipe 42
A sprinkling device 46 is provided at a tip end in the processing tank 30. The sprinkling device 46 sprinkles the supplied primary treatment liquid toward the surface of the filling layer 34a. The sprinkler 46 may be cylindrical or donut-shaped, with a hole in the bottom surface, or may be configured to overflow from the upper edge.

Further, a fibrous component layer 48 is provided below the foamed glass layer 36d and on the bottom surface of the container 32. The fibrous constituent layer 48 has the same configuration as the fibrous constituent layer 18 of the first treatment tank, and by disposing the fibrous constituent layer 48, the drainage of the treated water from the second treatment tank 30 can be performed smoothly. Can be something.

In this embodiment, a clogging prevention layer 50 is disposed above the first filling layer 34a.
The clogging prevention layer 50 has a particle size of 2 mm, 3 m
m, 5 mm. The clogging prevention layer 50 has a thickness of, for example, about 5 cm.

In this configuration, when the water pump 40 is driven to supply the primary processing liquid in the reserve tank 26 to the second processing tank 30, the primary processing liquid is supplied to the first filling layer 34 a in the container 32. Water is sprayed on the entire surface via a water spray device 46. Then, the four-stage filling layer 34 and the foamed glass layer 3
Go down 6. Thereby, it comes into contact with the wood chips constituting the filling layer 34. On the other hand, in the second processing tank 30,
The air is supplied from the air pump 28 and the packed bed 3
4 is maintained in an aerobic state. Therefore, the packed layer 3
Aerobic microorganisms adhere to and grow on the wood chips in 4, and effectively oxidatively decompose the BOD component contained in the primary treatment liquid in the first treatment tank 10 that descends. In particular, wood chips are woody and porous, and are very suitable as carriers for aerobic microorganisms. Therefore, the second processing tank 30
In this, an effective aerobic microbial treatment is achieved. Furthermore, wood chips have the advantage of being inexpensive.

Each of the filling layers 34 is made of a foamed glass layer 36.
Supported by. This foam glass layer 36 is made of granular foam glass. This granular foam glass,
As in the case of the above-described first treatment tank 10, it has a function of effectively discharging the liquid from the wood chips downward. Thus, clogging in each of the filling layers 34 can be prevented.

Further, the second processing tank 3 in the present embodiment
Numeral 0 is longer than the first processing tank 10 and has a multi-stage configuration. Then, the liquid that has passed through the filling layer 34 is dispersed in the foamed glass layer 36 to which air is supplied, and reaches the next filling layer 34. Therefore, the permeated treatment water supplied from the upper part is surely treated without causing a short circuit. The air is supplied into the foam glass layer 36 having a relatively high porosity. Therefore, the foamed glass layer 36 functions as an air diffusion member, and efficient aeration of the entire inside of the second processing tank 30 can be achieved. Further, the air is supplied to the foam glass layers 36 of each stage. Therefore, a larger amount of air is supplied to the upper side in contact with the liquid having a high BOD concentration, and effective processing can be performed.

Here, the filling layer 34 in the second processing tank 30
The greater the number of stages of the foamed glass layer 36, the better the processing effect, but practically three or four stages. Also, the filling layer 34
It is also possible to insert an air diffuser into the air outlet from which air is diffused. In this case, the air diffuser may be inserted vertically or horizontally. For example, it is preferable to insert a vertical air diffuser in the center of the second processing tank 30. further,
In the second processing tank 30, only the foamed glass layers 36 and the filling layers 34 are alternately formed in layers, and no partition walls or the like are formed on the way. Further, the air pipe 38 is only opened slightly from the side wall of the container 32 to the inside. Therefore, it is easy to take out the wood chips and the foamed glass forming the inner filling layer 34 and the foamed glass layer 36. These are preferably replaced periodically. In this case, the wood chips or the like may be taken out from above, but it is also preferable to provide a takeout window or the like below the container 32.

The permeated water in the first treatment tank 10 is supplied to the first packed bed 34a. This permeated water contains a considerable amount of SS component, and the first packed bed 3
Clogging is likely to occur on the surface portion 4a. In the present embodiment, in the upper part of the first filling layer 34a,
The clogging prevention layer 50 is added. Thereby, it is possible to prevent the occurrence of clogging on the surface portion of the first filling layer 34a, and it is possible to continue good processing for a long time.

Although illustration is omitted, in the present embodiment, a heater is provided around the containers 12 and 32, and the temperature is set in the first and second processing tanks 10 and 30. A thermometer to measure is arranged. The on / off of the heater is controlled so that the temperature in the first and second processing tanks 10 and 30 does not become 30 ° C. or lower. In this way, by controlling the temperature, the activity of the microorganisms in the processing tanks 10 and 30 can always be maintained at a sufficient level.
In addition, in the processing tanks 10 and 30, an organic matter oxidative decomposition reaction of aerobic microorganisms occurs. Therefore, there is also internal heat generation, and the normal temperature is higher than the outside air temperature. Therefore, heating is often unnecessary. In addition, the primary low temperature condition has few problems, and since 30 ° C. is not always the limit temperature, the heater capacity does not need to be large enough to guarantee 30 ° C. or more.

It is also preferable to use oxygen gas or air with an increased oxygen content (oxygen-rich air) instead of air as the gas to be supplied to the processing tank or the like.

Further, the filling layer 34 and the foamed glass layer (auxiliary layer) 36 may be at least one pair, and the lowermost layer may not be the foamed glass layer 36. That is, the filling layer 34 may be provided below the foamed glass layer 36, and the treated water may be discharged from the lowermost filling layer 34.

"Installation Location of Apparatus"
As described above, the processing tanks 10 and 30 are basically provided. Then, the wastewater containing the crushed garbage from the disposer provided at the drain of the household sink is treated. Therefore, the device of the present embodiment can be accommodated in the space below the kitchen sink. Further, the apparatus of the present embodiment can be installed outdoors. In this case, the pipe of the present apparatus may be connected from the disposer. This plumbing
It is preferable that the wastewater containing the crushed garbage can be transported by gravity.

[Modification of Apparatus] As described above, the apparatus of the present embodiment processes wastewater containing crushed garbage from the disposer. However, the disposer does not need to be provided separately from the apparatus, and may be formed integrally. That is, a disposer is integrally formed above the first processing tank 10 to receive the garbage discharged from the sink, crush and reprocess the garbage, and
It can be configured to flow into. Such a disposer-integrated device is preferably provided immediately below the sink, but may be installed outdoors so that the garbage flows into the disposer formed with the device together with water.

[Size of Wood Chips] In the above embodiment, the filling layers 14 of the first processing tank 10 and the second processing tank 30
34 wood chips having a particle size of about 1.5 mm (mostly 2 mm or less) were used. Here, an experiment was conducted by changing the particle size of the wood chips. According to this experiment, the larger the particle size of the wood chips, the more the packed bed 1
The permeability of the wastewater at 4, 34 increases. By using wood chips having a particle size of about 2 to 5 mm as the wood chips used for the packed layers 14 and 34 of the first processing tank and the second processing tank, the processing water can be maintained for a long time while maintaining the processing capacity. It was found that the water quality could be maintained at a predetermined level.

[Structure of Foamed Glass Layer (Auxiliary Layer)] In place of the foamed glass of the foamed glass layers 16 and 36, it is also preferable to use a wood chip. That is, the foamed glass layer 1
The layers 6 and 36 function as auxiliary layers for indicating the filling layers 14 and 34. However, these layers may be made of wood chips of the same material as the filling layers 14 and 34 (however, the particle size is not Layers are larger than packed layers). Wood chips have water retention and can provide the same processing effects as foamed glass. And by using wood chips,
When this is discarded, it can be used as compost. Note that biodegradable plastics and the like can also be used.

The auxiliary layer of the first processing tank 10 and the second processing tank 3
The lowermost auxiliary layer of 0, as described above, as a multilayer of the foamed glass layer and the fibrous constituent layer, adopts a material having a larger porosity as it goes down, so that the permeation treatment liquid can be discharged smoothly. it can. The same effect can be obtained by increasing the porosity substantially gradually or stepwise downward as one layer.

[Structure of First Processing Tank 10] As described above,
The first processing tank 10 includes a fibrous component layer 18, a foam glass layer 16, and a filling layer 14 from below. Then, experiments were carried out with these thicknesses changed. By this experiment, 7
The filling layer 14 using wood chips having a particle size of 1.7 mm to 5 mm (a main component of which is 2 mm or more) has a thickness of 5 mm or more.
It has been found that it is preferable to fill about 10 cm to about 10 cm. At this time, the foam glass layer 16 is preferably about 3 to 5 cm.

[Removal of Sludge from Primary Processing Liquid] In the above embodiment, the reserve tank 26 for storing the primary processing liquid is used.
, An aeration treatment was performed to prevent spoilage. But,
With this configuration, the primary processing liquid is basically kept in the second processing liquid as it is.
It will be introduced into the processing tank 30. The primary processing liquid has a considerable amount of SS (floating solids), and if this is directly introduced into the second processing tank 30, clogging is likely to occur in the second processing tank 30.

Therefore, it is preferable that the sludge in the primary treatment liquid is separated and settled by stopping or weakening the aeration in the reserve tank. Then, the sludge separated and settled is returned to the first treatment tank 10. Accordingly, the amount of SS introduced into the second processing tank 30 is reduced, and the occurrence of clogging in the second processing tank 30 is prevented, so that long-term stable processing can be performed.

Further, according to this configuration, the settled sludge is
It is processed again in the first processing tank 10. Therefore, it is not necessary to provide a special sludge treatment device or the like. The settled sludge does not necessarily need to be returned to the first treatment tank 10. If the sludge can be disposed outside, the sludge may be directly discharged outside the system.

Further, it is also preferable that the primary treatment liquid obtained in the first treatment tank is filtered with a filter to partially remove the SS component before flowing into the second treatment tank 30. Thereby, the occurrence of clogging in the second processing tank can be effectively prevented.

This filter may be provided in front of the reserve tank 26, in the reserve tank 26, after the reserve tank, in the pipe, or further, in the inflow portion of the primary treatment liquid of the second treatment tank 30. It may be provided. And this filter includes cloth-like filter material such as gauze (for example,
Asahi Chemical's trade name "Bencott" or a stainless sieve can be used. The sieve is preferably about 83 mesh (wire diameter: about 0.12 mm, mesh size: about 0.18 mm square).

It is preferable that the filter is periodically cleaned or replaced, and the cleaning water is supplied to the first treatment tank 1.
It may be returned to 0.

[Configuration of Second Processing Tank] The second processing tank 30
Increasing the flow rate increases the treated water BOD, and decreasing the flow rate decreases the treated water BOD. Also, when the height of the second processing tank 30 is increased, the treated water SS becomes smaller,
When the height is reduced, the treated water SS increases. Therefore, by adjusting the flow velocity and height of the second treatment tank 30, the treatment water BOD and SS can be controlled. BO of treated water
The required water quality for D and SS often differs depending on local governments and the like, and this apparatus can cope with the required water quality of the treated water by adjusting the flow velocity and height of the second treatment tank 30. . The height of the second processing tank 30 can be changed by changing the inflow position of the primary processing liquid, changing the number of stages, changing the outlet, and the like.

It is also preferable that kitchen wastewater other than the wastewater containing garbage that has been crushed by the disposer is treated in the second treatment tank 30. That is, kitchen wastewater flows into the second treatment tank 30 directly or via a storage tank such as the reserve tank 26. As a result, kitchen wastewater can be treated, and the overall organic matter discharge amount of wastewater discharged from homes and the like can be reduced.

[Cartridge Type Second Processing Tank] FIGS. 4 and 5 show another configuration example of the second processing tank 30. In this example, the filling layer 34 and the foam glass layer 36 can be inserted and removed as one set (or separately). That is, the bottom lid 50 that houses the fibrous material layer 48 is formed at the bottom of the container 32. And this bottom lid 50
Is attached to the bottom of the container 32 by a hinge 52. Then, the bottom lid 50 can be fixed to the container 32 by the stopper 54. The rubber packing 56 is located between the bottom cover 50 and the container 32, and when the bottom cover 50 is closed,
This is to prevent water leakage. Therefore, the bottom of the container 32 is closed by hanging the stopper 54,
By removing the stopper 54, the bottom of the container 32 is opened.

Then, a new filling layer 34 and a foam glass layer 36 are inserted from below, and the top filling layer 34 and the foam glass layer 36 are removed. The removed filling layer 34 and foamed glass layer 36 are on the inflow side, and have a high load in the treatment and tend to accumulate sludge. Therefore, by inserting a new filling layer 34 and a foamed glass layer 36 from below and excluding the inflow side filling layer 34 and the foamed glass layer 36, all the filling layers 34 and the foamed glass layer 36 are similarly used. , Very effective processing can be continued.

In order to perform such an operation easily, it is preferable that one packing layer 34 and one foam glass layer 36 are grouped together as a set. In other words, vinyl net,
The filling layer 34 and the foamed glass layer 36 may be housed in an elastic tube or the like, and may be inserted from below the container 32.
In addition, such a pack facilitates removal from above.

The removed filling layer 34 and foamed glass layer 36 may be cleaned and reused. It is also preferable to use compost as the filling layer 34 and replace it with new wood chips for those used for a certain period of time.

Further, the filling layer 34 and the foam glass layer 36
May be separately packed and separately replaceable. Furthermore, it is not always necessary to insert a new one from below, and only the upper layer of sludge may be replaced.

FIGS. 6 and 7 show still another configuration example of the second processing tank 30. This example is also of a cartridge type, but the structure for that is different from the above-mentioned example. In the example of FIG. 6, the container 32 is divided into two in the vertical direction. And, by being connected by a hinge (not shown), one of the containers 32 can be opened and closed like a door. The bottom plate of the container 32 is fixed to one side, and half of the side surface of the container 32 can be opened and closed. A rubber packing 62 is arranged at a position where the two abut against each other so that water leakage does not occur when the rubber packing 62 is closed. Further, the stopper 64 is for fixing the container 32 in a closed state.

Then, by continuing the processing, the packed layer 34
When the sludge accumulates, remove the stoppers, open the container 32, and fill the inside with the filling layer 34 and the foam glass layer 3.
Replace the pack consisting of six. Thereby, the filling layer 34 and the foam glass layer 36 can be appropriately replaced with new ones.

In the example of FIG. 7, the container 32 has a plurality of cylindrical bodies 70.
Are stacked. Further, the filling layer 34 and the foam glass layer 36 are accommodated inside each cylindrical body 70. Each cylindrical body 70 can be connected to another cylindrical body in the up-down direction, and a rubber packing 72 is arranged at a contact portion between the two to prevent water leakage. The stopper 74 is used to connect the two cylinders 70 to each other.

When the sludge has accumulated due to the continuation of the treatment, the filling layer 34 and the foamed glass layer 36 are removed together with the cylinder 70 and replaced with a new one. In this case, the cylindrical body 70 may be removed, and the filling layer 34 and the foam glass layer 36 therein may be replaced. With such a configuration, any of the filling layer 34 and the foamed glass layer 36 can be easily replaced with a new one.

Further, the accumulated sludge may be washed by flowing water from the inlet of the treated water, the air supply member or the outlet without replacing each layer.

FIGS. 4 to 6 schematically show the main parts, in which various members such as the air pipe 38 are omitted.

[0090]

【Example】

Experiment 1. "Experiment conditions" As processing tanks corresponding to the first processing tank 10,
A plastic water tank (20 × 30 × 20 cm) was prepared, and a 5 cmφ hole was formed in the bottom thereof to serve as a drain port. And as a support material layer (auxiliary layer), granular foam glass (grain of about 5 mm), filter material made of ceramics (hollow hexagon of about 1 cm square), gravel (particle diameter of about 1 cm), fibrous composition (wire) (A mat-like shape in which hard plastic fibers having a diameter of about 0.5 mm are entangled), and a wood chip is filled thereon. That is, as shown in Table 1, A
The tank is wood chips on 3 kg of ceramic filter material, the tank B is wood chips on 1.5 kg of ceramic filter material, the tank C is 1.5 kg of ceramic filter material, and the wood chips on foam glass (3 cm thick).
Tank D is a ceramic filter medium 1.5 kg, wood chips on 2 kg of gravel, and tank E is a 2 cm thick fibrous structure, foamed glass 1
The wood chips were directly filled with the wood chips on the cm thickness, and the F tank was directly filled with the wood chips. In addition, 1.4 kg of wood chips having a water content of about 70% were used.

[0091]

[Table 1] Then, 1 kg of garbage is placed in each of the processing tanks A to F.
2 L (liter: hereinafter, liters are represented by L) of the garbage-containing wastewater generated by disposing with a disposer is introduced at a rate of 2 L per day, and the change of the SS (floating solid) component of the wastewater and the change of the color of the wood chips are measured. Examined.

[Results] BOD of garbage-containing wastewater input
Was 3500 mg / L and SS was 2800 mg / L. FIG. 8 shows the change in SS of the primary treatment liquid when the wastewater was charged 2 L each day. As described above, in the F tank, the SS concentration of the permeation treatment water is reduced to about 100 mg / L from an early stage. Here, the lower SS concentration of the permeated water means that clogging has occurred accordingly. In this F tank, clogging occurred earlier, and the color of the wood chips at the bottom of the packed bed was black brown. From ocher to
Corruption has also begun.

On the other hand, in the C and E tanks, the SS concentration is 500 to
It was as high as 1000 mg / L, and the water permeability was good. No rot occurred.

The tanks A, B, and D had an SS concentration of the permeated water of about 500 mg / L, and were intermediate between the tank F and the tanks C and E. However, clogging began to occur in these A, B, and D tanks at the end of the experiment.

From these results, it can be seen that the presence of the support material layer (auxiliary layer) is important for preventing clogging. In particular, by providing a support layer (auxiliary layer) of granular foam glass,
It turns out that it is very effective in preventing the occurrence of clogging.

Table 2 shows the quality of the permeated water after 20 injections.

[0097]

[Table 2] As described above, the SS concentration was high in the tanks C and E, but the SS concentration was extremely low due to clogging in the tank F. A, B, D
In the tank, the SS concentration is decreasing, and it is predicted that clogging will occur as the operation continues.

Experiment 2 As shown in FIG.
A wood chip was packed in a column having a height of 345 mm and a processing tank 60 corresponding to the second processing tank 30 was formed. Then, 5 mL of a broth medium having a COD (chemical oxygen demand using potassium permanganate) of 12,500 mg / L was charged into the treatment tank 60, and carrier water (0.
(85% NaCl aqueous solution) at 2.07 mL / min. This carrier water was supplied from the carrier water tank 62 to the processing tank 60 by the peristaltic pump 64. Then, the treated water was collected by the fraction collector 66 and the change with time was observed. The fraction collector 66 was 3.5 minutes / column. In run 1, the carrier water was passed without aeration, and in run 2, the carrier water was aerated by supplying air from the air pump 68 to the carrier water tank 62.

FIG. 10 shows the result. Thus, r
In un1, the peak value of the COD of the treated water is 190 mg / L.
In run 2, the peak value of COD of treated water is 140
mg / L. This shows that the aeration promotes the removal of COD.

Experiment 3 In the same device as in Experiment 2, BOD1
3.5m drainage of 900mg / L, SS300mg / L
Water was passed at L / min for 5 hours a day (1 L a day). As a result, treated water with a BOD of 450 mg / L and an SS of about 60 mg / L was stably obtained.

Experiment 4 146 mm diameter processing tank (second
(Corresponding to treatment tank 30), granular foam glass (thickness 3 cm)
And wood chips (5 cm thick) were alternately laminated in four layers to form a tank having a height of 500 mm. Note that a fibrous component layer is disposed below the lowermost foamed glass layer. In addition, air was supplied to each layer of the granular foam glass from the side. The same wastewater as in Experiment 3 was passed through this treatment tank at 35 mL / min for 5 hours a day. Thereby, SS50mg /
About L and about 200 mg / L BOD were obtained stably.

From these Experiments 2 to 4, it can be seen that suitable processing can be performed by the second processing tank 30 of the present embodiment.

Experiment 5 The following experiment was performed using the system shown in FIG. 25% of garbage of 1.25 kg of garbage and 25 liters of water, and garbage-containing wastewater crushed by a disposer are charged daily (1.25 kg of garbage / 25 L of water / day)
Processing was performed. The water quality of the crushed liquid is BOD3500mg /
L, SS3300 mg / L.

The first processing tank 10 has an outer size of 35 ×
Two 60 cm pieces are prepared, and a total of 10 kg of wood chips are filled as the filling layer 14, and 1 kg of foamed glass is filled.
Degree filled. 70% or more of the wood chips of the filling layer 14 have a particle size of 1.7 mm or more (the main component is 2 mm or more). Table 3 shows the particle size distribution of the wood chips. The thickness of the filling layer 14 was about 5 to 10 cm, and the thickness of the foam glass layer (auxiliary layer) 16 was about 3 to 5 cm.

[0105]

[Table 3] As a result of this treatment, a BOD of 2000 mg / L and a SS of 1000 mg / L
L was obtained. Also, as shown in FIG.
The total weight (T-Wt) of the processing tank 10 is 3 at the beginning of use.
It was about 5 kg but about 52 kg in 10 days, 20
It increased to about 55 kg per day, and then gradually increased until 100 days, and reached about 60 kg in 100 days.
And after 100 days, the speed of weight increase will increase,
On 110 days, it rose to about 65 kg. From this, it was found that the processing can be continued without clogging for at least about 100 days under the conditions like this time.

Further, the primary processing liquid obtained in the first processing tank 10 was supplied to the second processing tank 30, and a processing experiment was performed. Two second processing tanks 30 having an outer dimension of 18 cm in diameter × 32 cm in height were prepared. Therefore, the total area is
508 cm ² . The water flow rate was 60 mL / min, and the air flow rate was 60 L / min. Further, as the filling layer 34, wood chips having a chip diameter of 2 mmφ or more were selected and used by sieving wood chips having the same particle size distribution as those used in the first treatment tank 10. In addition, the filling layer 34, the foam glass layer 3
Sample No. 6 had a thickness of 5 cm, and three layers were laminated.

As a result, water having a BOD of 200 mg / L and SS of about 50 mg / L was stably obtained as the treated water in the second treatment tank 30 for 70 days or more. Also, n in the treated water
Hexane-extracted substances were also sufficiently low at about several mg / L.

The wastewater containing garbage obtained by crushing the garbage with the disposer is treated using the first treatment tank 10 and the second treatment tank 30 to obtain a BOD of 200 m.
It was found that treated water of about g / L and SS of about 50 mg / L can be stably obtained. Further, as a result of the analysis, it was found that nitrogen was removed in the second processing tank 30. That is, from the comparison of the total nitrogen concentration of the influent water and the treated water in the second treatment tank 30,
% Nitrogen removal was achieved. From this, this device
It was also confirmed that the removal of nitrogen was effective.

[0109]

As described above, according to the organic wastewater treatment apparatus according to the present invention, organic matter in wastewater can be effectively decomposed by aerobic microorganisms while filtering the organic wastewater. In particular, the auxiliary layer below the packed bed allows the permeation treatment liquid to be smoothly drained from the packed bed, thereby preventing rot clogging in the packed bed. Also,
By using a wood chip as a microbial carrier for the packed bed, a sufficient amount of microorganisms can be retained in the packed bed.
Aerobic biological treatment can be performed effectively, and suitable treatment can be continued for a long period of time. Furthermore, by providing a multilayer structure of the filling layer and the auxiliary layer, and further providing a plurality of both layers, short-circuiting can be prevented and clogging can be prevented, so that effective processing can be performed. Further, by supplying air to the auxiliary layer and performing aeration, it is possible to perform aerobic biological treatment with higher performance.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of a solid-containing wastewater treatment device including an organic wastewater treatment device according to an embodiment, as viewed from the front.

FIG. 2 is a diagram schematically illustrating a configuration of a first processing tank viewed from a side.

FIG. 3 is a diagram schematically showing a configuration in which a second processing tank is viewed obliquely.

FIG. 4 is a view showing a configuration of a cartridge type second processing tank.

FIG. 5 is a diagram showing a configuration of a bottom portion of a second processing tank of a cartridge type.

FIG. 6 is a view showing another example of a cartridge type second processing tank.

FIG. 7 is a view showing still another example of the cartridge type second processing tank.

FIG. 8 is a diagram showing the results of processing experiments using various support material layers (auxiliary layers).

FIG. 9 is a diagram schematically showing a configuration of an experimental apparatus.

FIG. 10 is a view showing an experimental result.

FIG. 11 is a diagram showing a change in weight of a first processing tank.

[Explanation of symbols]

10 first treatment tank, 12 vessels, 14 packed bed, 16
Foam glass layer, 18 fibrous constituent layers, 20 corrugated sheet material, 2
2 drainage port, 24 reversing device, 26 reserve tank, 30 second treatment tank, 32 container, 34 packed bed, 3
6 Foam glass layer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Kimura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Eiji Kawano 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Tatsuhiko Sekiguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (20)

[Claims] 1. An organic wastewater treatment device for treating organic wastewater, wherein the wastewater is filled with a microbial carrier, the wastewater supplied is filtered, and a packed bed for aerobic biological treatment is provided. An organic wastewater treatment apparatus, comprising: an auxiliary layer that circulates discharged wastewater; and a gas supply member that diffuses air or oxygen gas into the packed layer, wherein the treated water is discharged through the auxiliary layer. 2. The organic wastewater treatment apparatus according to claim 1, wherein the auxiliary layer has a function of promoting drainage from the packed bed. 3. The organic wastewater treatment apparatus according to claim 1, wherein the auxiliary layer is provided below and adjacent to the packed layer. 4. The organic wastewater treatment according to claim 1, wherein the apparatus has a multi-stage configuration in which the packed layer and the auxiliary layer are alternately stacked in plural. apparatus. 5. The apparatus according to claim 4, wherein a gas supply member for supplying air or oxygen gas to the plurality of auxiliary layers is provided, and air or oxygen gas is diffused from the gas supply member. apparatus. 6. An organic wastewater treatment apparatus according to claim 1, wherein air or oxygen gas is forcibly supplied to the packed bed. 7. The organic wastewater treatment apparatus according to claim 1, wherein the auxiliary layer has a water permeability and is made of a material having a water retention property. . 8. The apparatus according to claim 7, wherein the water permeability of the auxiliary layer is better than the water permeability of the packed layer. 9. An organic wastewater treatment apparatus according to claim 1, wherein said auxiliary layer is made of a porous material. 10. The organic wastewater treatment apparatus according to claim 1, wherein the auxiliary layer is formed of a granular material. 11. The organic wastewater treatment apparatus according to claim 1, wherein the auxiliary layer is made of foamed glass. 12. The organic wastewater treatment apparatus according to claim 1, wherein the microorganism carrier of the packed bed is a wood chip. 13. The apparatus according to claim 1, wherein the organic wastewater to be treated is a wastewater containing garbage from a disposer, which is subjected to a filtration treatment and an aerobic treatment in a primary treatment device. An organic wastewater treatment device, which is primary treated water obtained by biological treatment. 14. The apparatus according to claim 1, wherein the organic wastewater to be treated further includes kitchen wastewater. 15. The apparatus according to claim 1, wherein when the number of the auxiliary layer is one, the auxiliary layer is a double-layered structure, and in the case of a plurality of the auxiliary layers, the auxiliary layer on the treated water discharge side at the last stage has at least a two-layer structure. An organic wastewater treatment apparatus, wherein a layer farther than a layer closer to the filling layer of the auxiliary layer has good water permeability. 16. The device according to claim 4, wherein the porosity of a layer farther than a layer closer to the filling layer of the auxiliary layer is increased to improve water permeability of a layer farther away. An organic wastewater treatment device characterized by the above-mentioned. 17. The device according to claim 1, wherein a lowermost auxiliary layer of the auxiliary layers has a porosity that gradually increases from a portion closer to the filler layer to a portion farther from the filler layer. An organic wastewater treatment device comprising: 18. The device according to claim 15, wherein the layer of the auxiliary layer remote from the filling layer is formed of a fibrous structure formed by entanglement of a large number of fibers. Organic wastewater treatment equipment. 19. The organic wastewater treatment apparatus according to claim 1, wherein the microorganism carrier of the packed bed has a particle size of 2 to 5 mm. 20. An organic wastewater treatment apparatus for treating organic wastewater, wherein the wooden chip has a packed bed for filtering wastewater supplied as being filled and supplied as a microbial carrier and performing aerobic biological treatment. And organic wastewater treatment equipment.