JP2002086187A - Organic waste water treating device and method by anaerobic and aerobic filter method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic waste water treating device and method capable of omitting blowers for ventilation and efficiently carrying out deodorization treatment. SOLUTION: This device consists of a first anaerobic treating vessel A which is lined up with anaerobic contact filter media in the form of a plurality of masses or assemblage having a spread in a transverse direction at prescribed intervals in the transverse direction in order to subject inflow organic waste water to digestion treatment and is disposed with these contact filter media in a plurality of stages so as to overlap partly one above the other at the prescribed intervals, a second anaerobic treating vessel C which is packed with the arbitrary contact filter media and an aerobic treating vessel B which has a means for subjecting the water to oxidation treatment by the blast from a blower BL1 for aeration. The device has exhaust ducts 20, 21 and 22 which communicate with the upper space of the aerobic treating vessel B, the upper space of the second anaerobic treating vessel C, the upper space of the first anaerobic treating vessel A and deodorizing device 30. The discharge side of the deodorizing device 30 is provided with an auxiliary suction blower BL2 in such a manner that the inside of the exhaust system holds negative pressure to atm. pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for treating organic wastewater by an anaerobic aerobic filter method combining anaerobic biological treatment and aerobic biological treatment, and more particularly, to odor treatment.

[0002]

2. Description of the Related Art Anaerobic and aerobic filter method is composed of two processes, anaerobic treatment and aerobic treatment. The anaerobic treatment is mainly used for organic matter removal, and wastewater treatment is combined with aerobic treatment as a finishing treatment. System.

In an anaerobic treatment performed in a treatment tank having an airtight structure, organic substances are decomposed by anaerobic microorganisms that are activated when there is no or insufficient dissolved oxygen in wastewater.
Methane gas and carbon dioxide gas are generated as final products. When a sulfur-based organic substance is contained, hydrogen sulfide is generated by decomposition.

[0004] The anaerobic treatment does not require the supply of oxygen.
Furthermore, since most of organic matter is decomposed into methane gas and carbon dioxide gas, there is an advantage that the amount of generated sludge can be reduced. On the other hand, there is a disadvantage that the reaction requires a long time, and in general wastewater treatment, it is often used for treating sludge generated there.

[0005] In general, aerobic treatment performed in an open-structure treatment tank is widely used in ordinary wastewater treatment, and organic substances serve as feed for aerobic microorganisms by microorganisms that are activated when dissolved oxygen is present. Proliferate microorganisms and generate excess sludge. The action of aerobic microorganisms on organic matter is oxidative action.

The anaerobic aerobic filter method, which is composed of two steps of anaerobic treatment and aerobic treatment, has the advantage of being economical because only a small amount of power is required in aerobic treatment as the power required for aeration. There is, for example, disclosed in Japanese Patent Publication No. 1-44397.

A space in which sludge accumulates is provided in the lower part of the anaerobic digestion reaction tank. When an anaerobic digestion reaction of wastewater is performed by a filter medium disposed above the space, sludge separated from the wastewater is removed. It is stored in the space. This sludge is drawn out every time the treatment is performed for a certain period.

One of the problems of the treatment of organic wastewater by the anaerobic aerobic filter method is that malodorous substances such as hydrogen sulfide are generated. This malodorous substance is gasified by methane gas and the like generated by the anaerobic digestion treatment.

The anaerobic digestion gas containing the malodorous gas causes, for example, corrosion of the inner wall of the upper part of the anaerobic digestion tank, and also leaks to the outside air, and gives an unpleasant feeling to workers and neighboring residents. Further, the exhaust gas diffused into the room of the equipment causes adverse effects such as corrosion of the contacted electric components. In some cases, the exhaust may fill certain spaces, putting the work environment at risk.

[0010] The treated water subjected to the anaerobic digestion treatment is subjected to an aerobic treatment in order to remove the remaining BOD and to provide dissolved oxygen to the treated water. In the aerobic treatment, there are cases where an oxygen-enriched gas having an increased oxygen concentration is used and cases where air is used. In general, aeration operation is often performed using air, and a method is employed in which bubbles are generated in water, gas-liquid contact is made, and oxygen is supplied. When air is sent for aerobic treatment and aeration is performed, reducing substances such as hydrogen sulfide contained in the liquid are gasified and accompanied by air bubbles, and odor is accompanied by exhaust from the aerobic treatment tank. .

Conventionally, exhaust air has been deodorized by providing a ventilation blower, deodorizing, and then discharging the air to the outside air. The operation of this ventilation blower accounted for most of the odor treatment costs.

Further, when the deodorization treatment is stopped, the influence of the malodor diffusion is exerted, so that the deodorization treatment must be performed continuously.
The expense of energy consumption has caused the processing costs to increase.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic wastewater treatment apparatus and method which can omit a ventilation blower and can efficiently perform deodorization treatment.

[0014]

According to the structure of the present invention, basically, the aerobic treatment tank has an airtight structure in which gas does not leak to the outside so that the exhaust gas does not diffuse to the outside air, and the pressure of the aeration blower is reduced. The aeration exhaust (odorous gas) is introduced into the deodorizing device using

The organic wastewater treatment apparatus of the present invention comprises a plurality of anaerobic contact filter media in the form of a plurality of lumps or aggregates extending in the lateral direction, for digesting the incoming organic wastewater. A first anaerobic treatment tank disposed in a plurality of stages so that a part thereof is vertically overlapped at a certain interval, and means for receiving treated water from the first anaerobic treatment tank,
A second anaerobic treatment tank filled with an arbitrary contact filter medium;
A second anaerobic treatment tank comprising an airtightly structured aerobic treatment tank provided with a means for receiving treated water from the anaerobic treatment tank, a means for oxidizing treatment by blowing air from an aeration blower, and a means for discharging treated water. And an apparatus for returning sludge generated in the aerobic treatment tank to the first anaerobic treatment tank and an apparatus for discharging sludge after digestion treatment from the first anaerobic treatment tank. Further, an exhaust means, for example, a duct, is provided which connects the upper space of the aerobic treatment tank directly or the upper space of at least one of the second anaerobic treatment tank and the first anaerobic treatment tank to communicate with the deodorizing device. .

Further, in another embodiment, a denitrification reaction tank filled with a carrier holding denitrifying bacteria and a nitrification reactor filled with a carrier holding nitrifying bacteria are provided between a second anaerobic treatment tank and an aerobic treatment tank. A reaction tank is provided, and the denitrification reaction tank is provided with a means for introducing treated water from the second anaerobic contact digestion tank, and a part of the treated water in the nitrification reaction tank together with the carrier or without transporting the carrier. The nitrification reaction tank is provided with a means for introducing the treated water from the denitrification reaction tank together with the carrier or without transporting the carrier, and a means for oxidizing treatment by blowing air from an aeration blower. The aerobic treatment tank includes means for introducing only nitrification-reacted treated water from the nitrification reaction tank, and means for oxidizing treatment by blowing air from an aeration blower, and at least one of the nitrification reaction tank and the aerobic treatment tank. As mentioned above as airtight structure It may be connected to a deodorizing device in the exhaust means so.

Alternatively, in another embodiment, a first denitrification reaction tank and a second denitrification reaction tank filled with a carrier holding denitrifying bacteria are provided between a second anaerobic treatment tank and an aerobic treatment tank, A first nitrification reaction tank and a second nitrification reaction tank filled with a carrier holding bacteria are provided, and the first denitrification reaction tank includes means for introducing treated water from a second anaerobic contact digestion tank, and 1 A means for introducing a part of the treated water of the nitrification reaction tank together with the carrier or without transporting the carrier is provided, and the first nitrification reaction tank is provided with the treated water from the first denitrification reaction tank together with the carrier, or Without transporting the carrier, comprising means for introducing and means for oxidizing by blowing from an aeration blower, wherein the second denitrification reaction tank is means for introducing only the nitrification reaction treated water from the first nitrification reaction tank, And a part of the treated water of the second nitrification reaction tank together with the carrier. There is without conveying the carrier, with means for introducing the second nitrification tank, the treated water from the second denitrification reactor with a carrier, or without transport of the carrier,
Means for introducing and means for oxidizing by means of air blowing from an aeration blower, wherein the aerobic treatment tank is means for introducing only nitrification-reacted treated water from the second nitrification reaction tank, and air blowing from the aeration blower. A means for performing an oxidation treatment may be provided, and at least one of the first nitrification reaction tank, the second nitrification reaction tank, and the aerobic treatment tank may have an airtight structure, and may be connected to the deodorizing device by the exhaust means as described above.

The upper space of the aerobic treatment tank, the upper space of the first anaerobic treatment tank, the upper space of the second anaerobic treatment tank, and the inside of the deodorizer are maintained at a negative pressure with respect to the atmospheric pressure. ,
An auxiliary suction blower may be provided on the discharge side of the deodorizing device.

According to the method for treating organic wastewater of the present invention, the above-mentioned organic wastewater treatment apparatus is used to remove the inflowing organic wastewater into the first form.
The treatment in the anaerobic treatment tank, followed by the treatment in the second anaerobic treatment tank, followed by the aerobic oxidation treatment in the aerobic treatment tank, the sludge generated in the second anaerobic treatment tank and the aerobic treatment tank When the sludge is returned from the first anaerobic treatment tank and discharged from the first anaerobic treatment tank after being subjected to anaerobic digestion treatment together with the inflowing organic wastewater, the upper part of the aerobic treatment tank is blown by an air blower for aeration. Directly from space or second
The generated gas in the tank is transported to the deodorizing device through at least one of the upper space of the anaerobic processing tank and the first anaerobic processing tank, and the deodorized exhaust gas is discharged from the deodorizing apparatus to the outside air. When passing through the first anaerobic treatment tank and the second anaerobic treatment tank, the upper space above the closed anaerobic filter bed where the gas generated by anaerobic fermentation is maintained at a high concentration is aerobic. The high-concentration gas is diluted by supplying aeration exhaust gas for the process.
Thereby, corrosion of the wall surface in the upper space of the anaerobic treatment tank can be prevented.

When the denitrification / nitrification treatment is carried out between the second anaerobic treatment tank and the aerobic treatment tank, the denitrification / nitrification treatment is performed directly from the upper space of the nitrification reaction tank or between the second anaerobic treatment tank and the first anaerobic treatment tank. The generated gas in the tank is transported to the deodorizing device via at least one upper space of the anaerobic treatment tank, and the deodorized exhaust gas is discharged from the deodorizing device to the outside air.

In addition, it is preferable to provide a pretreatment device for removing impurities, sedimentary sediment, and the like, which flow into the organic wastewater, before the first anaerobic treatment tank.

For the aerobic treatment, an aerobic filter bed without using a sedimentation basin or an activated sludge method using an aeration tank and a sedimentation tank can be applied.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The insides of the first anaerobic treatment tank A, the second anaerobic treatment tank C, and the aerobic treatment tank B are shown in detail in a sectional view.

The first anaerobic treatment tank A comprises a cylindrical filter bed 1 having parallel side walls and a hopper 2 thereunder. An inflow portion 3 communicating with a sand basin (not shown) is connected to the filter bed 1. An inflow pipe 5 is connected to the inflow section 3. Inflow pipe 5
Is vertically arranged at the center of the filter bed 1, and its lower end is opened at the lower part of the hopper 2. Further, a sludge drawing pipe 8 is connected to a lower end of the first anaerobic treatment tank A, and a treated water discharge pipe 9 is connected to an upper part thereof.

In the first anaerobic treatment tank A, a plurality of stages of anaerobic filter beds 6 are arranged in the vertical direction with a required gap 7 therebetween. On the anaerobic filter bed 6, for example, a member that spreads in the horizontal direction, for example, a dish-shaped member, for placing an anaerobic filter medium is spatially arranged. A slit-shaped hole is provided at the bottom of each dish. As the anaerobic contact filter medium, for example, plastics having corrosion resistance and easy to mold can be used. Instead of placing it on the dish-shaped member, a bulky anaerobic contact filter medium (lumped contact filter medium) having a fixed volume may be directly arranged.

With such a contact filter, sedimentation and floating of sludge deposited on the contact filter can be permitted, and performance such as anaerobic digestion and sedimentation separation can be maintained without stirring.

Further, according to such a configuration, even if the sludge deposited on the bottom of the tank floats by anaerobic fermentation, it can collide with the dish-shaped member and only the gas in the sludge can float, and the sludge itself precipitates again. Therefore, the efficiency of anaerobic digestion, sedimentation separation, etc. can be enhanced, and the supernatant water in the tank can be kept clean.

The arrangement interval of the anaerobic filter beds 6 and the like are optimized based on the experience of actual operation.

In the upper space of the first anaerobic treatment tank A, two exhaust ducts 21 and 22 are opened, the exhaust duct 22 is connected to the suction side of the deodorizing device 30, and the exhaust duct 21 is
It is connected to the upper space of the anaerobic treatment tank C.

In the second anaerobic treatment tank C after the first anaerobic treatment tank A, an ordinary filter bed is used to enhance the treatment effect. Further, in a third anaerobic treatment tank (not shown) after the second anaerobic treatment tank C, a fine filter medium is used, and the BOD of the treated water can be extremely reduced.

A sludge return pipe 14 is connected to the lower end of the second anaerobic treatment tank C, and an end of the sludge return pipe 14 is connected to the inflow section 3 of the first anaerobic treatment tank A.

The exhaust duct 21 and the exhaust duct 20 are connected to the upper space of the second anaerobic treatment tank C, and the exhaust duct 20 is connected to the upper space of the aerobic treatment tank B.

The aerobic treatment tank B comprises an aerobic filter bed. A vertical flow pipe 10 is provided at the center of the aerobic filter bed 11.
Are arranged vertically. Therefore, the treated water subjected to the anaerobic digestion treatment enters from the upper end of the flow pipe 10 and exits from the lower end, and rises up the aerobic filter bed 11. The purified water outflow pipe 13 is connected to the upper part.

At the lower end of the aerobic treatment tank B, a sludge return pipe 1
4 is connected, and the end of the sludge return pipe 14 is communicated with the inflow section 3 of the first anaerobic treatment tank A.

The exhaust duct 20 is connected to the upper space of the aerobic treatment tank B.

In the lower part of the aerobic treatment tank B, an air diffuser 16 from the aeration blower BL1 is opened. Aerobic filter bed 11
Can be sufficiently contacted with the air for aeration coming out of the air diffuser 16. The air blowing capacity of the aeration air is measured by measuring the flow rate with an appropriate meter provided in the purified water outflow pipe 13 and measuring the BOD
It is determined by adding an appropriate amount of oxygen, for example, 20%, to the amount of oxygen necessary for the treatment, nitrification of ammonia, oxidation of reducing substances, dissolved oxygen, and the like.

The deodorizing device 30 may be a device based on a well-known technique such as an aerobic treatment in which aeration is performed by dissolving and removing odor by aeration during biological deodorization and water spraying, and a device based on a well-known technique, such as a device in which activated carbon is adsorbed. Used in combination.

According to the organic wastewater treatment method of the present invention, the odor gas in the aerobic treatment tank in the anaerobic aerobic filter method can be introduced into the deodorization apparatus without leaking.
The gas generated by anaerobic fermentation and corroding the walls of the anaerobic treatment tank that comes into contact with it is diluted by supplying aerated exhaust air from the aerobic treatment tank, guided to the deodorizer, and after sufficient deodorization, released to the outside air can do.

That is, the exhaust gas which has risen into the upper space of the aerobic treatment tank B is sent to the upper space of the second anaerobic treatment tank C through the exhaust duct 20, and is anaerobic in the second anaerobic treatment tank C. It is mixed with the gas generated by fermentation. This mixed gas is sent from the second anaerobic treatment tank C to the upper space of the first anaerobic treatment tank A through the exhaust duct 21 and mixed with the gas generated by anaerobic fermentation in the first anaerobic treatment tank A. Is done. This mixed gas is sent from the first anaerobic treatment tank A to the deodorizing device 30 through the exhaust duct 22,
After being deodorized, the air is discharged from the exhaust duct 23 to the outside of the system. In the middle of the exhaust duct 23, an auxiliary suction blower BL2
Is provided. In the example shown in the figure, the processing tanks are connected by ducts. However, when the processing tanks are connected directly next to each other, holes are formed in the walls of the processing tanks to replace the ducts. You may. That is, the ventilation means is not limited to the duct.

The aeration blower BL1 is in a state where gas does not leak from the exhaust system including the first anaerobic treatment tank A, the second anaerobic treatment tank C, the aerobic treatment tank B, and the exhaust ducts 20, 21 and 22 ( If the structure above each water surface is configured in an airtight state), it will be pressurized exhaust. The discharge pressure of the aeration blower used for the aeration is, for example, a blower with a pressure of about 40 kPa used to overcome the water depth of the aerobic treatment tank B and blow the air.
It is about 0 Pa, and there is almost no burden on the aeration blower by the exhaust system. Therefore, the auxiliary suction blower BL
2 is not essential and can be omitted.

However, the auxiliary suction blower BL2 is
Upper space of first anaerobic treatment tank A, upper space of second anaerobic treatment tank C, upper space of aerobic treatment tank B, and exhaust duct 2
It is also possible to select and control the inside of the exhaust system consisting of 0, 21 and 22 so as to be kept lower than the atmospheric pressure, that is, at a negative pressure. In this case, if these parts are opened for inspection, etc., or even if a gas leaks into the exhaust system for some reason, the gas does not leak out of the exhaust system and the working environment is always safe. The effect of keeping is obtained.

FIG. 2 is a block diagram showing another embodiment of the present invention. 1 in that the exhaust duct 20 from the aerobic treatment tank B is directly connected to the deodorizing device 30. Other parts are configured similarly to FIG.

FIG. 3 is a block diagram showing another embodiment of the present invention. In the embodiment shown in FIG. 1, the treated water 9 from the second anaerobic treatment tank C is introduced into the denitrification reaction tank D, and the treated water 31 from the denitrification reaction tank D is supplied to the aeration blower BL3. Is introduced into the nitrification reaction tank E equipped with a denitrification treatment tank, a part 42 of the treated water of the digestion reaction tank E is returned to the denitrification treatment tank D, and the gas generated in the nitrification reaction tank E is deodorized by the blowing pressure of the blower BL3. The difference is that an exhaust duct 24 is provided for introduction into the fuel cell 30. Note that one of the exhaust duct 20 and the exhaust duct 24 may be omitted.

FIG. 4 is a block diagram showing another embodiment of the present invention. In the embodiment shown in FIG. 1, the treated water 9 from the second anaerobic treatment tank C is introduced into the first denitrification reaction tank D1, and the treated water 31 from the first denitrification reaction tank D1 is aerated. Into the first nitrification reaction tank E1 equipped with a blower BL3 for
A part 42 of the treated water of the nitrification reaction tank E1 is transferred to the first denitrification treatment tank D.
1 and a part 43 of the treated water in the first nitrification reaction tank E1.
Is introduced into the second denitrification reactor D2, and the second denitrification reactor D2
Treated water 36 from a second air blower BL4
The gas introduced into the nitrification reaction tank E2, a part 47 of the treated water in the second nitrification reaction tank E2 is returned to the second denitrification treatment tank D2, and the gas generated in the first nitrification reaction tank E1 and the second nitrification reaction tank E2. To
The difference is that exhaust ducts 24 and 25 are respectively introduced into the deodorizing device 30 by the blowing pressure of the blowers BL3 and BL4. Note that any one of the exhaust ducts 20, 24, and 25 may be omitted.

As shown in FIG. 2 to FIG. 4, the exhaust system of the present invention causes the exhaust system including the odor generated in the treatment plant and the surrounding air to be sucked into the exhaust system.
It is possible to adopt a configuration in which the suction is performed by the auxiliary suction blower BL2 on the exhaust side of No. 0, and the effect is great.

[0047]

As described in detail above, the organic wastewater treatment apparatus and method by the anaerobic aerobic filter method of the present invention can efficiently deodorize and eliminate odors without using a ventilation fan. Divergence can be completely prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing one embodiment of the present invention.

FIG. 3 is a block diagram showing one embodiment of the present invention.

FIG. 4 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

 A, C Anaerobic treatment tank B Aerobic treatment tank D, D1, D2 Denitrification reaction tank E, E1, E2 Nitrification reaction tank BL1, BL3, BL4 Blower for aeration BL2 Auxiliary suction blower 1 Filter floor 2 Hopper 3 Inflow Part 5, 10 inflow pipe 6 anaerobic filter bed 7 gap 8 sludge extraction pipe 9, 12, 31, 36, 42, 43, 48 discharge pipe 11 aerobic filter bed 13 purified water outflow pipe 14 sludge return pipe 16 diffuser pipe 20, 21, 22, 23, 24 Exhaust duct 30 Deodorizing device 70 Valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 3/34 101 C02F 3/34 101D

Claims (8)

[Claims] 1. An anaerobic contact filter in the form of a plurality of lumps or aggregates extending in the horizontal direction is arranged at regular intervals in the horizontal direction to digest the inflowing organic wastewater, and the upper and lower parts are partially separated. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. An aerobic treatment tank having an air-tight structure, comprising: an anaerobic treatment tank, means for receiving treated water from the second anaerobic treatment tank, means for oxidizing treatment by blowing air from an aeration blower, and means for discharging treated water. A device for returning sludge generated in the second anaerobic treatment tank and the aerobic treatment tank to the first anaerobic treatment tank, and a device for discharging sludge after digestion treatment from the first anaerobic treatment tank. In organic wastewater treatment equipment, above the aerobic treatment tank An organic duct having an exhaust duct for directly connecting the internal space or for connecting at least one of the upper spaces of the second anaerobic treatment tank and the first anaerobic treatment tank and communicating with the deodorizing device. Wastewater treatment equipment. 2. An anaerobic contact filter in the form of a plurality of lumps or aggregates extending in the horizontal direction is arranged at regular intervals in the horizontal direction to digest the incoming organic wastewater, and a part thereof is vertically arranged. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. A denitrification reaction tank filled with a carrier holding denitrifying bacteria, a nitrification reaction tank filled with a carrier holding nitrifying bacteria, and an aerobic treatment tank equipped with a means for discharging treated water. Wherein the first anaerobic catalytic digester has a means for introducing nitrogen-containing organic wastewater, and the second anaerobic catalytic digester has means for introducing treated water from the first anaerobic catalytic digester. The denitrification reaction tank introduces treated water from the second anaerobic catalytic digestion tank. Means, and a means for introducing a part of the treated water of the nitrification reaction tank, together with the carrier, or without transporting the carrier, wherein the nitrification reaction tank is provided with the treated water from the denitrification reaction tank together with the carrier, or the carrier. A means for introducing, and a means for oxidizing by air blowing from a blower for aeration, wherein the aerobic treatment tank is a means for introducing only nitrification-reacted treated water from a nitrification reaction tank, and a blower for aeration. A first anaerobic contact digestion tank and a means for returning suspended matter and sludge generated in the second anaerobic contact digestion tank and the aerobic treatment tank; Means for discharging excess sludge into the anaerobic contact digestion tank, and at least one of the aerobic treatment tank and the nitrification reaction tank has an airtight structure, and the upper space thereof is directly or And the first at least one of the upper space of the anaerobic treatment tank are sequentially connected, organic wastewater treatment apparatus characterized by comprising an exhaust duct for communicating the deodorizer. 3. In order to digest the incoming organic wastewater, anaerobic contact filter media in the form of a plurality of lumps or aggregates extending in the horizontal direction are arranged at regular intervals in the horizontal direction, and a part thereof is arranged vertically. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. A first denitrification reaction tank and a second denitrification reaction tank filled with a carrier holding denitrifying bacteria, a first nitrification reaction tank and a second nitrification reaction tank filled with a carrier holding nitrifying bacteria, An aerobic treatment tank provided with means for discharging treated water, wherein the first denitrification reaction tank has means for introducing treated water from a second anaerobic contact digestion tank, and a first nitrification reaction tank. Part of the treated water with or without carrier,
Means for introducing, wherein the first nitrification reaction tank is an means for introducing treated water from the first denitrification reaction tank together with the carrier or without transporting the carrier, and a means for oxidizing the treated water by blowing from a blower for aeration. Wherein the second denitrification reaction tank comprises:
A means for introducing only the nitrification reaction treated water from the first nitrification reaction tank, and a means for introducing a part of the treatment water of the second nitrification reaction tank together with the carrier or without transporting the carrier,
The second nitrification reaction tank includes a means for introducing treated water from the second denitrification reaction tank together with the carrier or without transporting the carrier and a means for oxidizing the treated water by blowing from an aeration blower, The treatment tank has means for introducing only the nitrification-reacted treated water from the second nitrification reaction tank and means for oxidizing treatment by blowing air from the aeration blower, and the first anaerobic contact digestion tank has the second anaerobic A first nitrification reaction tank and a second nitrification reaction tank, comprising: means for returning suspended matter and sludge generated in the catalytic digestion tank and the aerobic treatment tank; and means for discharging excess sludge to the first anaerobic catalytic digestion tank. At least one of them has an airtight structure, and the upper space thereof is directly connected or the upper space of at least one of the second anaerobic treatment tank and the first anaerobic treatment tank is sequentially connected to communicate with the deodorizing device. Let Organic waste water processing device comprising the duct. 4. The upper space of the aerobic treatment tank, the upper space of the first anaerobic treatment tank, the upper space of the second anaerobic treatment tank, and the inside of the deodorizer are maintained at a negative pressure with respect to the atmospheric pressure. The organic wastewater treatment device according to any one of claims 1 to 4, wherein an auxiliary suction blower is provided on the discharge side of the deodorization device. 5. An anaerobic contact filter medium in the form of a plurality of lumps or aggregates extending in the horizontal direction is arranged at regular intervals in the horizontal direction to digest the inflowing organic wastewater, and a part of the anaerobic contact filter is arranged vertically. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. An aerobic treatment tank having an air-tight structure, comprising: an anaerobic treatment tank, means for receiving treated water from the second anaerobic treatment tank, means for oxidizing treatment by blowing air from an aeration blower, and means for discharging treated water. A device for returning sludge generated in the second anaerobic treatment tank and the aerobic treatment tank to the first anaerobic treatment tank, and a device for discharging sludge after digestion treatment from the first anaerobic treatment tank. Organic wastewater treatment equipment removes incoming organic wastewater. Anaerobic digestion treatment, followed by aerobic oxidation treatment, while discharging the treated water subjected to aerobic oxidation treatment from the aerobic treatment tank, the sludge generated in the second anaerobic treatment tank and the aerobic treatment tank, In the first anaerobic treatment tank, in the method of treating organic wastewater discharged after being subjected to anaerobic digestion treatment together with the inflowing organic wastewater, the exhaust pressure of the aerobic treatment tank is directly discharged by the blowing pressure from the aeration blower. Alternatively, an organic wastewater treatment method characterized in that the wastewater is conveyed to a deodorizer through at least one of the upper space of the second anaerobic treatment tank and the first anaerobic treatment tank, and the deodorized exhaust gas is discharged from the deodorizer to the outside air. . 6. An anaerobic contact filter in the form of a plurality of lumps or aggregates extending in the horizontal direction is arranged at regular intervals in the horizontal direction to digest the inflowing organic wastewater, and a part thereof is vertically arranged. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. A denitrification reaction tank filled with a carrier holding denitrifying bacteria, a nitrification reaction tank filled with a carrier holding nitrifying bacteria, and an aerobic treatment tank equipped with a means for discharging treated water. The organic wastewater treatment apparatus performs an anaerobic digestion treatment on the inflowing organic wastewater, subsequently performs an aerobic oxidation treatment, discharges the treated water subjected to the aerobic oxidation treatment from the aerobic treatment tank, and performs a second anaerobic treatment. Sludge generated in the anaerobic treatment tank and the aerobic treatment tank In a treatment tank, in an organic wastewater treatment method that is discharged after being subjected to anaerobic digestion treatment together with inflowing organic wastewater, exhaust air from at least one of the aerobic treatment tank and the nitrification reaction tank is discharged by a blowing pressure from an aeration blower. An organic material, which is transported to a deodorizing device directly or through an upper space of at least one of a second anaerobic processing tank and a first anaerobic processing tank and discharges deodorized exhaust gas from the deodorizing device to the outside air. Wastewater treatment method. 7. An anaerobic contact filter in the form of a plurality of lumps or aggregates extending in the horizontal direction is arranged at regular intervals in the horizontal direction to digest the inflowing organic wastewater, and a part thereof is arranged vertically. Has a first anaerobic treatment tank arranged in a plurality of stages so as to overlap at regular intervals, and a means for receiving treated water from the first anaerobic treatment tank, and a second anaerobic tank filled with an arbitrary contact filter medium. A first denitrification reaction tank and a second denitrification reaction tank filled with a carrier holding denitrifying bacteria, a first nitrification reaction tank and a second nitrification reaction tank filled with a carrier holding nitrifying bacteria, An organic wastewater treatment apparatus comprising an aerobic treatment tank equipped with a means for discharging treated water was subjected to anaerobic digestion treatment of inflowing organic wastewater, followed by aerobic oxidation treatment and aerobic oxidation treatment A second anaerobic treatment tank discharges the treated water from the aerobic treatment tank. And a method for treating organic wastewater discharged after anaerobic digestion treatment with inflowing organic wastewater in a first anaerobic treatment tank in a first anaerobic treatment tank, wherein the blowing pressure from an aeration blower is used. By the first
The exhaust gas of at least one of the nitrification reaction tank, the second nitrification reaction tank, and the aerobic treatment tank is transported directly to the deodorizer via the upper space of at least one of the second anaerobic treatment tank and the first anaerobic treatment tank. And discharging the deodorized exhaust gas from the deodorizing device to the outside air. 8. An auxiliary suction blower is provided on the discharge side of the deodorizing device, and the upper space of the aerobic processing tank, the upper space of the first anaerobic processing tank, the upper space of the second anaerobic processing tank, and the The organic wastewater treatment method according to any one of claims 5 to 7, wherein the inside is maintained at a negative pressure with respect to the atmospheric pressure.