JP3764812B2 - 厨 芥 Wastewater treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a treatment device for waste water generated by a waste grinder such as a disposer in a food processing factory, a restaurant, a house, or the like.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a disposer for pulverizing garbage generated from a kitchen (hereinafter referred to as cocoon) has become widespread.
[0003]
Disposers are electrical appliances that pulverize potatoes and discharge them together with kitchen wastewater, and have gained popularity among consumers as they can eliminate everyday troubles such as storage, collection, and transportation of potatoes. However, in view of the impact on the environment and the increase in load exceeding the capacity of existing wastewater treatment facilities, the current situation is that the use of a disposer for dredging dredged wastewater is self-sufficient.
[0004]
For this reason, development of the method and apparatus which can treat dredged wastewater at the generation | occurrence | production point is performed actively.
[0005]
As an example, Japanese Patent Application Laid-Open No. 58-20291 discloses a treatment apparatus having both a precipitation action and an aeration action. According to this, only organic solids are treated as a soluble pollutant. Processing is not considered.
[0006]
[Problems to be solved by the invention]
However, according to the knowledge of the present inventors, it is common for organic solid-containing wastewater to contain a soluble pollutant that should be treated, so only solids are treated as described above. It is not appropriate to do so, and the disclosed wastewater treatment device is not suitable for the treatment of dredged wastewater.
[0007]
In addition, this publication describes that solids are effectively removed by precipitation, but the organic solids in the soot often contain persistent substances such as fibers, When the action is used, these hardly decomposable substances accumulate, and there is a problem that it is necessary to extract sludge during operation.
[0008]
Therefore, the applicant of the present invention consists of an aerobic digester that separates dredged wastewater into solid concentrated wastewater and separated wastewater by a separation device and processes the solids concentrated wastewater, and a contact aeration tank that processes the separated wastewater. Therefore, a processing apparatus that can prevent increase and accumulation of sludge in the tank by providing a stirring means in the digestion tank while optimizing the capacity of each tank has been studied.
[0009]
By the way, the sardines are constantly mixed with inorganic solids that are difficult to decompose by biological treatment, such as earth and sand, chicken eggshells, birds and fish bones, and shells attached to vegetables. Since this inorganic solid has a large specific gravity and a large particle size, excessive power is required to sufficiently stir in the aerobic digester tank.
[0010]
On the other hand, sludge generated by the decomposition of organic solids in an aerobic digester is mainly composed of microorganisms that assimilate organic substances, the specific gravity is close to water, and microbial flocs are also disassembled by the stirring effect Therefore, since the particle size is reduced, the liquid in the tank can be mixed without being precipitated at the bottom of the tank with a relatively small stirring power.
[0011]
Therefore, if only the extraction of excess sludge is not required, the stirring power may be small, but if it is not necessary to extract the inorganic solid in addition to the excess sludge, it is excessive to prevent precipitation of the inorganic solid. Stirring power is required.
[0012]
Here, except for some special food wastewater, dredging wastewater is generally low in the amount of inorganic solids in dredging wastewater, so excessive stirring power for inorganic solids is profitable. There is a high possibility of being ignored. In such a case, it is possible to treat organic solids, which are the overwhelming main component of dredged wastewater, with no apparent power, and to eliminate the need to extract excess sludge. Will gradually accumulate.
[0013]
In addition, an aerobic digester is equipped with a diffuser at the bottom, and as inorganic solids accumulate at the bottom of the tank, it will clog the opening of the diffuser for a long time. This results in significantly shortening the life of the device.
[0014]
In order to avoid these points, the extraction work of inorganic solids may be carried out periodically, but the work of taking out a small amount of inorganic substance from a large volume aerobic digestion tank as compared with the tank capacity is costly. -There is a lot of waste.
[0015]
The present invention is made in view of such circumstances, and before removing organic solids and soluble pollutants contained in wastewater, inorganic solids that are difficult to biologically treat are removed. By removing it outside the system, excessive stirring power is not required, and there is no adverse effect caused by the hardly decomposable substances and inorganic solids contained in the wastewater, and a large amount of excess sludge derived from microorganisms An object of the present invention is to provide a dredging waste water treatment device that can eliminate the need for the extraction work.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the dredged wastewater treatment apparatus of the present invention includes a sand settling tank 21 for settling and separating inorganic solids and a dredged wastewater 211 excluding the inorganic solids as illustrated in FIG. The aerobic digester 23 to be processed, the settling tank 22 that separates the internal liquid of the aerobic digester 23 into concentrated organic solids and sludge, and separated wastewater 221, and the separated wastewater 221 are more aerobic. comprising a wastewater treatment tank (contact aeration tank) 24 for biological treatment, the waste water treatment tank 24 for the aerobic biological treatment, with and configured to direct treated water 231 of the aerobic digestion tank 23, It is characterized by providing the aerobic digestion tank 23 with a means (aeration device 232) for stirring the treated water in the tank.
<Action>
According to the treatment apparatus of the present invention, since the inorganic solids contained in the wastewater are removed from the system by the sand settling tank 21, excessive stirring power for diffusing the inorganic solids is not required. Since the inorganic solids are stored in the dedicated sand settling tank 21, the extraction work can be performed easily and at a lower cost than when the inorganic solids are extracted from a large-capacity aerobic digestion tank. it can.
[0018]
In addition, the hydraulic residence time can be set longer than the time required for the decomposition of the organic solids in the aerobic digestion tank 23 , whereby the organic solids contained in the inflow drainage can be sufficiently decomposed. Moreover, since the aerobic digestion tank 23 is provided with a stirring means, the treated water in the tank can be constantly stirred, and the action of decomposing solid matter by aerobic microorganisms can be enhanced.
[0019]
Furthermore, by allowing the treated water 231 in the tank to flow out, the sludge concentration in the tank can always be maintained at a constant equilibrium state. As a result, the increase and accumulation of sludge in the aerobic digestion tank 23 is achieved. Will not occur.
[0020]
In the processing apparatus of the present invention, it is more convenient to provide an air diffuser for supplying air into the sand settling tank so that the contents can be prevented from decaying or odor.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a block diagram showing a configuration of an embodiment of a wastewater treatment apparatus .
The processing apparatus 1 shown in FIG. 1 is an apparatus used for processing dredging drainage generated from a detached house in a sewerage maintenance area, for example, and includes a sand settling tank 11, a settling tank 12, an aerobic digestion tank 13, and a contact aeration tank 14. It is mainly composed.
[0023]
The sand settling tank 11 is a device that separates and stores inorganic solids from dredged wastewater, and is connected to a drainage pipe 110 for flowing together the disposer drainage (spider drainage) and kitchen drainage generated in the sink of a detached house. The
[0024]
The dredged waste water 111 from which the inorganic solid matter is removed in the sand settling tank 11 flows into the settling tank 12.
[0025]
The sedimentation tank 12 is a device that separates the dredged waste water 111 from which inorganic solids have been removed into an organic solids concentrated waste water 121 and a separated waste water 122, and the solids separated in the precipitation tank 12 are the surrounding liquid. At the same time, it is transferred to the aerobic digester 13 by the air lift pump 16 as the solid concentrate drainage 121.
[0026]
The aerobic digestion tank 13 is an apparatus that keeps the inside of the tank in an aerobic atmosphere by the air ejected from the diffuser 132 provided at the bottom of the tank, and mainly decomposes organic solids by the action of aerobic microorganisms. The aerobic digestion tank 13 is provided with a liquid feed pump 15 for constantly stirring the treated water in the tank.
[0027]
On the other hand, the separated waste water 122 separated in the settling tank 12 is guided to the contact aeration tank 14. Similar to the aerobic digestion tank 13, the contact aeration tank 14 has a structure in which the inside of the tank is maintained in an aerobic atmosphere by the air blown from the air diffuser 142 at the bottom of the tank, and decomposes the soluble pollutant.
[0028]
In addition to the separated drainage 122 described above, the effluent 131 overflowed from the aerobic digestion tank 13 flows into the contact aeration tank 14.
[0029]
Next, the operation of the embodiment shown in FIG. 1 will be described.
First, the disposer waste water and the kitchen waste water flow into the sand settling tank 11 through the drain pipe 110. In the sand settling tank 11, an inorganic solid matter having a large sedimentation property is removed by the precipitation separating action, and this inorganic solid matter is removed. The culm drainage and kitchen drainage 111 are guided to the settling tank 12.
[0030]
The solid-concentrated waste water 121 separated in the settling tank 12 is transferred to the aerobic digestion tank 13 by the air lift pump 16, where the organic solid is decomposed by biooxidation of aerobic microorganisms.
[0031]
In the aerobic digestion tank 13, since the solid matter in the tank is constantly stirred by the liquid feed pump 15, the decomposition action by the aerobic microorganism is effectively performed, and the solid matter can be sufficiently decomposed. . Moreover, since the in-tank treated water 131 is allowed to flow out, the sludge concentration in the aerobic digestion tank 13 is always maintained in a constant equilibrium state, so that sludge does not increase in the tank.
[0032]
Then, the treated water 131 in which the solid matter is sufficiently decomposed in the aerobic digestion tank 13 flows out of the tank due to overflow when the solid matter concentrated waste water 121 flows into the tank. The effluent 131 is guided to the contact aeration tank 14.
[0033]
On the other hand, the separated waste water 122 from which the organic solid matter has been removed in the sedimentation tank 11 flows into the contact aeration tank 14, and the dissolved pollutants are decomposed in the tank by the biooxidation of aerobic microorganisms, and the treated water 141. Is discharged out of the tank due to overflow.
[0034]
As described above, in the embodiment shown in FIG. 1, the sedimentary tank 11 is used to remove inorganic solids having a large sedimentation property from the wastewater, and then the aerobic digestion tank 13 and the contact aeration tank 14 are used to organically Since the solid material and the soluble pollutant are separately treated, the capacity and stirring power of each treatment tank can be optimized.
[0035]
In addition, since the inorganic solid matter is stored in the dedicated sand settling tank 11, the cost is lower than extracting the inorganic solid matter from the large-capacity aerobic digestion tank, and the workability is improved.
[0036]
In addition to the configuration of the embodiment shown in FIG. 1, if a sand diffuser 11 is provided with an air diffuser for supplying air into the tank, the contents can be prevented from decaying or odor.
[0037]
Here, in the embodiment shown in FIG. 1, each of the aerobic digestion tank 13 and the contact aeration tank 14 is a single tank, but the present invention is not limited to this, and a plurality of treatment tanks are provided. You may use what connected the tank.
[0038]
Further, the air diffuser, the advection method, the discharge method, the stirring means, and the like as ancillary means of the aerobic digestion tank 13 and the contact aeration tank 14 are not limited to those having the configuration shown in FIG. Any method may be adopted as long as it can obtain the same effect as the contents.
[0039]
FIG. 2 is a block diagram showing the configuration of the embodiment of the present invention.
The treatment apparatus 2 of this embodiment is an apparatus used for the treatment of dredged wastewater generated from an apartment house, and is mainly composed of a sand settling tank 21, a settling tank 22, an aerobic digestion tank 23, and a contact aeration tank 24. Yes.
[0040]
The sand settling tank 21 is a device that separates and stores inorganic solids from dredged wastewater, and is connected to a drain pipe 210 for flowing together the disposer wastewater and kitchen wastewater generated in the sink of each house.
[0041]
The dredged waste water 211 from which the inorganic solid matter is removed in the sand settling tank 21 flows into the aerobic digestion tank 23. In the sand settling tank 21, the air diffuser 212 is provided at an appropriate water depth.
[0042]
The aerobic digestion tank 23 has a structure in which the inside of the tank is maintained in an aerobic atmosphere by air ejected from an air diffuser 232 provided at the bottom of the tank, and mainly decomposes organic solids. The air diffuser 232 provided in the aerobic digestion tank 23 also serves as stirring power for constantly stirring the treated water in the tank.
[0043]
The aerobic digestion tank 23 is provided with a path 26 through which the internal liquid can be circulated with the precipitation tank 22.
[0044]
The settling tank 22 is a tank that separates treated water into concentrated organic solids and sludge and separated wastewater 221 by a settling action, and the bottom of the tank is inclined toward the path 26 to the aerobic digestion tank 23. It is processed into a shape.
[0045]
Then, the treated water 231 in the aerobic digestion tank 23 is transferred from a suitable depth to the contact aeration tank 24 by the liquid feed pump 25.
[0046]
On the other hand, the separated waste water 221 separated in the settling tank 22 is guided to the contact aeration tank 24. Similarly to the aerobic digestion tank 23, the contact aeration tank 24 has a structure in which the inside of the tank is maintained in an aerobic atmosphere by the air ejected from the air diffuser 242 to the bottom of the tank, and dissolves pollutants.
[0047]
Further, the organic solid and sludge concentrated in the sedimentation tank 22 are returned to the aerobic digestion tank 23 through the path 26 and further decomposed and stirred.
[0048]
Next, the operation of the embodiment shown in FIG. 2 will be described.
First, the disposer drainage and the kitchen drainage flow into the sand settling tank 21 through the drain pipe 210. In the sand settling tank 21, the sedimentary separation action removes the inorganic solid matter having a large sedimentation property, and the inorganic solid matter is removed. The kitchen wastewater and kitchen wastewater 211 are led to the aerobic digester 23.
[0049]
In the aerobic digestion tank 23, the solid matter in the tank is constantly stirred by the air diffuser 232 that also serves as the stirring power. Therefore, the decomposition action by the aerobic microorganisms is effectively performed, and the solid matter is sufficiently removed. Can be disassembled. In addition, by allowing the treated water 231 in the tank to flow out with the liquid feed pump 25, the sludge concentration in the aerobic digestion tank 23 is always maintained in a constant parallel state, so that sludge may increase in the tank. Disappear.
[0050]
The internal liquid of the aerobic digestion tank 23 is separated into concentrated organic solids and sludge and separated waste water 221 by the precipitation separation action using the gradient in the precipitation tank 22, and the concentrated organic solids. And sludge returns to the aerobic digester 23 through the path | route 26, and is further stirred and decomposed | disassembled.
[0051]
The outflow water 231 of the aerobic digestion tank 23 is guided to the contact aeration device 24, and the separated waste water 221 decomposed in the settling tank 22 is contacted by overflow when the inflow water 211 flows into the aerobic digestion tank 23. It is transferred to the aeration tank 24.
[0052]
In the contact aeration tank 24, the soluble pollutant is decomposed by biological oxidation of aerobic microorganisms, and the treated water 241 is discharged out of the tank by overflow.
[0053]
As described above, also in the embodiment shown in FIG. 2, since the inorganic solids contained in the dredged wastewater are removed from the system by the sand settling tank 21, the capacity and stirring power of each treatment tank are appropriate. Can be realized. In addition, since the inorganic solid matter is stored in the dedicated sand settling tank 21, the cost is lower than extracting the inorganic solid matter from the large-capacity aerobic digestion tank, and the workability is improved.
[0054]
Here, in the embodiment shown in FIG. 2, each of the aerobic digestion tank 23 and the contact aeration tank 24 is a single tank, but the present invention is not limited to this, and a plurality of treatment tanks are used. You may use what connected the tank.
[0055]
Further, the diffuser, the advection method, the discharge method, the stirring means, and the like as the auxiliary means of the aerobic digestion tank 23 and the contact aeration tank 24 are not limited to the one shown in FIG. Any method may be adopted as long as it can obtain the same effect as the contents.
[0056]
【The invention's effect】
As described above, according to the wastewater treatment apparatus of the present invention, the inorganic solids contained in the wastewater are removed from the system, and the organic solids and the soluble pollutants are individually treated. Therefore, it is possible to optimize the capacity of each treatment tank and the stirring power, whereby the maintenance and management of the treatment apparatus can be performed easily and inexpensively, and the entire apparatus can be made compact.
[0057]
Moreover, this can maintain the sludge density | concentration in a tank in a fixed equilibrium state, without an excess sludge increasing in a digestion tank. Furthermore, since the inorganic solid does not accumulate at the bottom of the digester, it is possible to reduce the failure of the incidental device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of the invention described in claim 1; FIG. 2 is a block diagram showing a configuration of an embodiment of the invention described in claim 3;
1 Processing device 11 Sand settling tank 12 Settling tank (separation device)
13 Aerobic digestion tank 14 Contact aeration tank (drainage treatment tank)
DESCRIPTION OF SYMBOLS 15 Liquid feed pump 16 Air lift pump 110 Drain pipe 111 The dredging drainage 121 except the solid inorganic substance 121 Solid matter concentration drainage 122 Separation wastewater 131 Treated water of an aerobic digester 132 Aeration apparatus 141 Treated water 142 Aeration apparatus 2 Processing device 21 Sand settling tank 22 Settling tank 23 Aerobic digestion tank 24 Contact aeration tank (drainage treatment tank)
25 Liquid feed pump 26 Channel 210 Drain pipe 211 Drainage drainage 212 excluding inorganic solid matter 212 Aeration device 221 Separation wastewater 231 Aerobic digester treated water 232 Aeration device 241 Treatment device treated water 242 Aeration device

Claims (2)

A device used to reduce the concentration of organic solids contained in dredging wastewater, a sand settling tank that separates inorganic solids from dredged solids, and dredging drainage that excludes the inorganic solids An aerobic digester to be treated, a settling tank for separating the internal liquid of the aerobic digester into concentrated organic solids and sludge and separated wastewater, and wastewater for further aerobic biological treatment of the separated wastewater comprising a treatment vessel, the waste water treatment tank to perform the aerobic biological treatment, the conjunction is configured to direct the treated water aerobic digestion tank, means for agitating the intracisternal to the aerobic digestion tank A wastewater treatment apparatus characterized by being provided.   The apparatus for treating dredged wastewater according to claim 1, wherein the sand basin is provided with an air diffuser for supplying air into the tank.

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