JP2000117284A - Upflow type anaerobic treatment equipment and treatment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further simplify the equipment structure and to enable more efficient separation of formed gas, more efficient settling separation of sludge particles and highly efficient treatment of organic wastewater by placing a lower stage three-phase separation member and an upper stage three-phase separation member which is positioned above the lower stage three phase separation member and has almost the same structure as that of the lower stage three-phase separation member, and using the space between both the two separation members as a flow rectification zone, in the equipment. SOLUTION: This equipment is provided with: an anaerobic treatment vessel 1; a water-to-be- treated supply means 8 which is placed in the lower part of the treatment vessel 1 and connected to a water-to-be-treated supply flow passage 11; a treated water overflow member 15 which is placed in the upper part of the treatment vessel 1 and used for discharging treated water to the preceding stage by allowing the treated water to overflow; a treated water pit 17 placed outside the vessel 1; two stage three-phase separation members 2 and 3 each of which is used for separating a treatment mixture into three phases, i.e., a gas, a liquid and sludge and placed in the horizontal direction in the intermediate part of the treatment vessel 1; a circulation flow passage 14a which is used for circulating a liquid through the water-to-be-treated supply means 8 and connected to the treatment vessel 1 at a position midway between the three-phase separation members 2 and 3; a sludge bed A which is formed below the lower stage three-phase separation member 2 and in which sludge particles are fluidized; and a flow rectification zone which is formed between the lower and upper stage three-phase separation members 2 and 3 and is effective in promoting the settlement of sludge particles entrained by the upflow stream.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an organic effluent, wherein an organic effluent is allowed to flow upward through a self-granulated sludge bed (hereinafter simply referred to as a sludge bed) of microorganisms formed in an anaerobic treatment tank. The present invention relates to an upward anaerobic treatment device (hereinafter referred to as a UASB device) for decomposing organic substances by the biological action of microorganisms, and a method for treating the same.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for treating organic industrial wastewater or sewage such as food processing wastewater, fermentation factory wastewater, chemical factory wastewater, and pulp and paper factory wastewater, means for supplying treated water at the lower part, treated water and water at the upper part. A gas discharge means is provided, and a sludge bed in a blanket state is formed below the inside of the sludge bed by sludge (hereinafter referred to as sludge particles) mainly composed of methane bacteria and microorganisms are formed. The organic wastewater is anaerobically and biologically decomposed by upwardly circulating wastewater, and the generated gas such as methane gas is separated from the treated water at the top, and the treated water is discharged from the treated water discharge means. And the generated gas is discharged from the gas discharging means.
An ASB device is used.

In the UASB device, anaerobic microorganisms that biologically decompose organic substances in wastewater are converted into particles using the microorganisms themselves or fine particles as nuclei. Since the wastewater can be efficiently treated, the installation area of the apparatus can be reduced, and the methane gas generated can be used as a fuel or a raw material for producing a chemical product.

However, in the conventional general UASB apparatus, turbulent flow occurs in the liquid in the processing tank due to the generated methane gas. Therefore, when the upward flow velocity of the water to be treated is increased, the sludge particles are treated together with the treated water. There is a risk of spillage from water discharge means. In addition, when the upward flow velocity of the water to be treated is increased, the sludge load is locally overloaded, acid-producing bacteria grow densely on the surface of the sludge particles, and the structure of the sludge particles becomes a structure that is difficult for gas to permeate. The specific gravity of the sludge particles becomes lighter and easier to flow out. Therefore, conventionally, sludge particles are not allowed to expand and flow by slowing the upward flow velocity of the water to be treated, and the sludge particles are treated while being maintained in a blanket state.

As described above, the conventional UASB apparatus has a low upward flow velocity and does not expand and flow, so that the contact efficiency between the water to be treated and the sludge particles is low, and the inorganic solid matter contained in the water to be treated is low. Is easily captured by the sludge particles, and the biological activity of the sludge cannot be maintained high. Also, if the upward flow velocity is increased, sludge particles may flow out,
It has been difficult to increase the processing efficiency under high speed and high load conditions.

[0006] In view of the above problems, the height of the processing tank is set to 2 to
It is possible to reduce the flow of sludge particles and to increase the supply amount of the water to be treated by increasing the efficiency by three times and efficiently separating generated gas and sludge particles.
Improved device that can be up to 3 times higher (hereinafter referred to as high speed UASB
It is called a device. ), A plurality of gas collection tubes in the height direction.
A high-speed UASB device in which gas separators provided with a gas separator are provided in two upper and lower stages and a recovered gas is used for generating an internal circulation flow of liquid is described in JP-A-61-71896. Japanese Patent Application Laid-Open No. 61-204093 discloses a high-speed UASB device in which a gas separation section having three stages of gas recovery hoods is provided at a staggered position in the height direction.

[0007]

SUMMARY OF THE INVENTION The above-mentioned JP-A-61-71 is disclosed.
No. 896 and JP-A-61-204093,
In the configuration of the high-speed UASB apparatus described above, since a large number of pipes and hoods for gas recovery are arranged in the processing tank, the apparatus becomes unnecessarily complicated and the equipment cost increases.

Therefore, the present invention can simplify the complicated structure of the conventional high-speed UASB device, and can more efficiently perform the separation of the produced gas and the sedimentation and separation of the sludge particles. High-speed UASB that enables processing
The purpose is to provide an apparatus and a processing method.

[0009]

The gist of the present invention for achieving the above object is as follows.
An organic wastewater is circulated upward in an anaerobic treatment tank provided with a treated water supply means in the lower part, a treated water discharge means and a gas discharge means in the upper part, and a sludge bed formed by self-granulating sludge below the inside. In an upflow anaerobic treatment apparatus to be treated, a plurality of gas recovery hoods having a gas discharge pipe at an upper part thereof are provided at predetermined positions in a horizontal direction at a position higher than at least 1/2 of an effective water depth in the treatment tank. Are arranged in two rows with the lower row gas collector and the upper row gas collector where the gas recovery hood is located with a certain gap above the opening that is the upward flow channel of the lower row gas collector. A lower three-phase separating member for separating the gas, liquid and sludge is provided, and an upper three-phase separating member having substantially the same configuration as the lower three-phase separating member is provided at a position higher than the lower three-phase separating member. Phase separation member and upper three-phase separation member Rectifying zone between - a upflow anaerobic treatment apparatus which is characterized in that the emissions.

[0010] In the second aspect of the present invention,
The upflow anaerobic treatment device according to claim 1,
An upflow anaerobic treatment apparatus characterized in that each of the lower three-phase separation member and the upper three-phase separation member has the same vertical projected area as the horizontal sectional area of the processing tank.

Further, in the invention according to claim 3,
The upward flow anaerobic treatment apparatus according to claim 1 or 2, wherein an opening of an opening which is an upward flow passage formed by a plurality of gas recovery hoods in a lower row and an upper row of gas collectors. An upflow anaerobic treatment apparatus, wherein a total sectional area is 30% to 70% of a horizontal sectional area of the treatment tank.

Further, in the invention according to claim 4,
The upward flow anaerobic treatment apparatus according to any one of claims 1 to 3, wherein the total opening of the openings that are upward flow channels formed by the lower row and the upper row gas collectors in the gas collector. An upflow anaerobic treatment device, wherein a cross-sectional area is 30% to 70% of a horizontal cross-sectional area of each of the treatment tanks.

Further, in the invention according to claim 5,
The upflow anaerobic treatment apparatus according to any one of claims 1 to 4, wherein a gas discharge pipe provided above a plurality of gas recovery hoods in a gas collector is provided in the processing tank. An upflow anaerobic treatment device which is connected to a seal pot attached to the outside and is sealed with water.

Further, in the invention according to claim 6,
The upflow anaerobic treatment apparatus according to any one of claims 1 to 5, wherein a rectifying zone between the lower three-phase separation member and the upper three-phase separation member is effective in the processing tank. An upflow anaerobic treatment device characterized by a height of 5 to 30%, preferably 10 to 20% of the water depth.

Further, in the invention according to claim 7,
The treated water is supplied from the treated water supply means at the bottom, and the sludge bed of self-granulated sludge formed at the bottom of the inside is upwardly circulated to biologically treat the organic matter anaerobically and the lower three phases. The liquid is circulated upward at a liquid rising speed of 60 to 90 m / hr at the separation member, gas, liquid and sludge are separated, the gas is recovered by a gas recovery hood, and the sludge is further settled by a rectifying zone. Also, the liquid is extracted from the rectifying zone and circulated to the treated water supply means, and the liquid ascending speed at the upper three-phase separation member is 30 m / m.
Upflow anaerobic treatment characterized by flowing upwards at a rate of hr or less, extracting and discharging treated water from an upper treated water discharging means, and collecting gas from a gas discharging means.

Further, in the invention according to claim 8,
The treated water is supplied from the treated water supply means at the bottom, and the sludge bed of self-granulated sludge formed at the bottom of the inside is upwardly circulated to biologically treat the organic matter anaerobically and the lower three phases. The liquid is circulated upward at a liquid rising speed of 30 m / hr or less at the separation member to separate gas, liquid, and sludge to recover the gas.
The sludge is further settled in a rectifying zone, and the liquid is circulated upward at a liquid rising speed of 30 m / hr or less at the upper three-phase separation member, and treated water is extracted from the treated water discharge means on the upper part. The upward anaerobic treatment is characterized in that a part of the anaerobic treatment is circulated to the treated water supply means, the remainder is discharged out of the system, and the gas is recovered from the gas discharge means.

With the above structure, the water to be treated is supplied into the treatment tank from the treatment water supply means at the lower portion, and the sludge bed of the sludge particles formed below the inside is circulated upward to remove organic matter. Anaerobic and biologically treated, gas, liquid and sludge can be efficiently separated by the lower three-phase separation member, rectifying zone and upper three-phase separation member, so high efficiency treatment of organic wastewater Is possible.

Further, since the gas discharge and recovery system is connected to a seal pot attached to the outside of the processing tank and sealed with water, the structure in the processing tank is simplified and the equipment cost is reduced.

[0019]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of an upflow anaerobic treatment device according to one embodiment of the present invention, FIG. 2 is a configuration diagram of an upflow anaerobic treatment device according to another embodiment of the present invention, and FIG. FIG. 4 is a plan view of a three-layer separation member of another embodiment, and FIG. 5 is an explanatory view of an upflow anaerobic treatment device according to one embodiment of the present invention. FIG. In the drawings, members having the same functions are denoted by the same reference numerals.

Reference numeral 1 denotes a cylindrical anaerobic treatment tank having a closed structure (hereinafter simply referred to as a treatment tank), but may be a rectangular treatment tank. At the lower part of the treatment tank, there is provided treated water supply means 8 to which a treated water supply flow path 11 is connected, and at the upper part, a treated water outlet in which treated water is discharged in an upstream stage. A treated water discharge means 9 is provided, which includes a buffer member 15 and a treated water pit 17, and is connected to a treated water discharge flow path 12. Further, a generated gas discharge flow through a buffer tank 18 and a seal pot 7 is provided. The passage 13 is connected, and a gas discharging means 10 provided with a gas suction device (not shown) is provided.

At an intermediate position in the processing tank 1, two-stage three-phase separation members 2 and 3 for separating into three phases of gas, liquid and sludge are respectively provided horizontally in the horizontal direction. A circulation passage 14a for circulating the liquid to the water-to-be-treated supply means 8 is connected to an intermediate position of the sludge bed A, and a sludge bed A in which sludge particles are fluidized is formed below the lower three-phase separation member 2, A rectifying zone B is formed between the lower three-phase separating member 2 and the upper three-phase separating member 3 to promote the sedimentation of the sludge particles entrained in the upward flow. Further, in the sludge bed A of the treatment tank 1,
Sludge discharging means 19 for extracting excess sludge particles is provided.

The treatment water supply means 8 preferably distributes the treatment water uniformly upward in the entire horizontal cross section of the treatment tank 1. It is preferable to dispose the shaped member over substantially the entire bottom surface, and it may be a member that supplies the water to be treated in the tangential direction in the treatment tank 1, but is not limited thereto.

The treated water overflow member 15 is
The side surface into which the treated water flows is a member formed of a notch, a slit shape, a lattice shape, a wire mesh, or the like, but a structure in which the microorganism particles floating with the treated water do not flow out is preferable. Further, when the treated water discharged from the treated water discharge means 9 is used as the circulating water circulating in the treated water supply means 8, the circulation flow path 14a becomes a circulation flow path 14b.

The two-phase separating members 2 and 3 are located at positions higher than at least 1/2 of the effective water depth in the treatment tank 1 (that is, in FIG. 2 means a gas collector in which a plurality of gas recovery hoods 6 each having a gas discharge pipe 16a or 16b at the top are arranged at predetermined intervals in the horizontal direction. , The upper row gas collector 4a and the upper row gas collector 4b where the gas recovery hood 6 is located with a certain gap above the opening, which is the upward flow passage of the lower row gas collector 4a. It is a lower three-phase separation member for separating gas, liquid and sludge.

The numeral 3 is provided at a position higher than the lower three-phase separating member 2, and is provided between the lower three-phase separating member 2 and the rectifying circuit.
A plurality of gas recovery hoods 6 having substantially the same configuration as the lower three-phase separation member 2 and having a gas discharge pipe 16c or 16d at the top are provided in a horizontal direction. Gas collectors arranged at intervals are arranged in the upper row gas collector 5b where the gas recovery hood 6 is located with a certain gap above the opening, which is the upward flow passage of the lower row gas collector 5a and the lower row gas collector 6a. And two rows.

The distal end of the gas discharge pipe 16 extending outside the processing tank 1 is connected to a seal pot 7 provided outside the processing tank 1 and sealed with water. As shown in FIG. 1, the seal pot 7 includes a lower row gas collector 4a, an upper row gas collector 4b, a lower row gas collector 5a, and an upper row gas collector 4a. 5b, gas exhaust pipes 16a, 16b, 16
A single seal pot 7 to which all of c and 16d are connected may be used, or a plurality of seal pots to be connected to each of the gas discharge pipes 16a, 16b, 16c and 16d as shown in FIG. 7 is acceptable.

The lower three-phase separating member 2 and the upper three-phase separating member 3 are connected to the gas recovery tubes of the lower row gas collectors 4a, 5a.
6 and the gas recovery hoods 6 of the upper row gas collectors 4b and 5b are located vertically in the openings which are the upward flow channels, respectively, so that the projected area in the vertical direction is Is the same as the horizontal cross-sectional area. The upper row gas collector 4
b, the horizontal size of the gas recovery hood 6 is the same as the size of the opening that is the upward flow channel formed by the gas recovery hood 6 of the lower row gas collectors 4a, 5a, or Or more.

The lower three-phase separating member 2 and the upper three-phase separating member 3 each have a horizontally elongated triangular or semi-cylindrical gas recovery hood 6 having an open lower surface, as shown in FIG. As described, concentrically arranged configurations may be used,
Further, as shown in FIG. 4, a configuration arranged in a straight line may be used. However, the present invention is not limited to those configurations.

The total cross-sectional area of the opening, which is the upward flow passage formed by the plurality of gas recovery hoods 6 in the lower and upper rows of gas collectors, is the horizontal cross-sectional area of the processing tank 1 respectively. Is preferably 30% to 70%. That is,
In FIG. 5, the total cross-sectional area obtained by adding up the cross-sectional areas of the openings, which are the upward flow channels having the width of a1 or a2, is equal to the diameter of the processing tank 1.
Is 30% to 70% of the horizontal cross-sectional area.

The total cross-sectional area of the opening, which is the upward flow passage formed by the lower and upper gas collectors 4a, 4b or 5a, 5b in the gas collector, is equal to the horizontal cross-sectional area of the processing tank 1. Is preferably 30% to 70%. That is, in FIG. 5, the total cross-sectional area obtained by integrating the cross-sectional areas of the openings, which are the upward flow channels having the width b1 or b2, is 30% to 70% of the horizontal cross-sectional area where the diameter of the processing tank 1 is d. is there.

The rectifying zone B between the lower three-phase separating member 2 and the upper three-phase separating member 3 has a height of 5 to 30%, preferably 10 to 20% of the effective water depth in the treatment tank 1. is there. That is, in FIG. 5, Hb is 1 of the effective water depth H in the treatment tank 1.
Meaning 0-30% height.

The operation of the present invention will be described below with reference to the drawings. Water to be treated as organic wastewater such as food processing wastewater is supplied from the treated water supply flow path 11 to the lower part of the treatment tank 1 via the treated water supply means 8, and the inside of the treatment tank 1 is uniformly turned upward. By distributing the sludge as a stream, a sludge bed A of sludge particles formed by microorganisms such as methane bacteria that self-granulate as a seed microorganism using sewage sludge and the like initially filled therein is formed, but sludge particles from other devices are initially formed. It may be filled.

The upward flow velocity of the water to be treated is the same as that of the conventional UAS.
In the B apparatus, the flow rate is about 1 to 2 m / hr in order to prevent the sludge particles from flowing out due to the expansion and development of the sludge bed A, and the inorganic solid matter contained in the water to be treated is easily captured by the sludge particles. However, the biological activity of the sludge cannot be kept high, and the supply amount of the water to be treated is small, so that it is difficult to increase the treatment efficiency under high-speed and high-load conditions. Since the phase separation is performed efficiently, the flow velocity can be extremely high as 4 to 30 m / hr, and the expansion and expansion of the sludge bed A can be positively promoted, and the contact efficiency between the water to be treated and the sludge particles can be increased. it can. Further, the supply amount of the water to be treated can be increased, and the treatment efficiency can be increased under high-speed and high-load conditions.

In the water to be treated supplied into the treatment tank 1, organic substances in the water to be treated are decomposed by the biological action of microorganisms while flowing upward through the sludge bed A, and gas such as methane gas is generated. . The sludge bed A expands and expands by 20% or more as compared with the conventional sludge bed, and the inorganic solid and the organic solid mainly containing sedimentation velocity of 4 m / hr or less in the water to be treated are settled. Since it is not carried out, it is discharged out of the system together with the treated water without being attached to the sludge particles. In addition, the sludge particles that have exceeded a certain amount due to the growth of microorganisms are extracted from the sludge discharge means 19 to the outside of the system.

The water to be treated, in which the organic matter has been decomposed by the microorganisms in the sludge bed A, further rises and reaches the lower three-layer separating member 2,
An opening a1, which is an upward flow channel of the lower three-phase separation member 2,
Gas, liquid and sludge are separated while flowing upward at a liquid rising speed of 30 to 90 m / hr at b1, and the gas is collected by gas recovery hoods of the lower and upper gas collectors 4a and 4b. The sludge is recovered from the gas discharge pipe 16 through the seal pot 7, and the sludge is settled on the sludge bed.

The liquid ascending speed at the lower three-phase separating member 2 is when the liquid is extracted from the circulation channel 14a of the rectifying zone and circulated to the water supply means 8, and a part of the treated water Is circulated from the circulation channel 14b to the water-to-be-treated supply means 8, in order to efficiently perform three-phase separation, the liquid is upwardly circulated at a liquid rising speed of 30 m / hr or less at the lower three-phase separation member 2 part. There is a need. The gas recovery rate at the lower three-phase separation member 2 is about 60 to 95% of the generated gas.

The water to be treated, which has been subjected to three-phase separation in the lower three-phase separation member 2, is further settled and separated while the ascending zone rises. The sediment is settled on the sludge bed A from the opening which is the counter flow passage, and a part of the water to be treated is extracted from the circulating water discharge passage 14 and circulated to the treated water supply means.

The water to be treated reaches the upper three-phase separation member 3,
An opening a2, which is an upward flow channel of the upper three-phase separation member 3,
Gas, liquid and sludge are separated while flowing upward at a liquid rising speed of 30 m / hr or less at b2, and the gas is collected by the gas collection hoods of the lower and upper row gas collectors 5a and 5b and discharged. The sludge is recovered from the pipe 16 through the seal pot 7 and settles on the sludge bed through the lower three-phase separating member 2.

The water to be treated, which has been purified by the above, is
Through the treated water overflow member 15 and treated water pit 17 of the treated water discharge means 9, the treated water is discharged from the treated water discharge channel 12 to the outside of the system. The gas is recovered from the generated gas discharge channel 13 to a gas tank or the like via the tank 18 and a gas suction device (not shown).

[0040]

According to the present invention, there is provided a high-speed UASB device capable of efficiently separating product gas and sludge particles, suppressing outflow of microbial particles, and increasing the supply amount of water to be treated. The advantages are further enhanced, the complicated structure of the conventional high-speed UASB device is simplified, the separation of generated gas and the sedimentation separation of sludge particles can be performed more efficiently, and the supply amount of the water to be treated is increased. U capable of high efficiency processing
An ASB apparatus and a processing method.

According to the first aspect, a two-stage three-phase separating member including two rows of gas collectors is provided at a position higher than at least 1/2 of the effective water depth in the processing tank.
Since the three-phase separation is performed efficiently and the height of the sludge bed is high, the expansion and expansion of the sludge bed can be actively promoted, and the contact efficiency between the water to be treated and the sludge particles can be increased. The supply amount of treated water can be increased, and the treatment efficiency can be increased under high-speed and high-load conditions.

According to the second aspect, the projected area of the three-phase separating member in the vertical direction is the same as the horizontal sectional area of the processing tank, so that the generated gas can be reliably captured and recovered.

According to the third aspect of the present invention, the total cross-sectional area of the opening, which is the upward flow passage formed by the plurality of gas recovery hoods in the gas collector, is 30% to 30% of the horizontal cross-sectional area of the processing tank. Since it is 70%, the rising speed of the upward flow of the water to be treated is not increased more than necessary, and three-phase separation is efficiently performed.

In claim 4, the total cross-sectional area of the opening, which is the upward flow passage formed by the lower and upper gas collectors, is 30% to 70% of the horizontal cross-sectional area of the processing tank. Therefore, the rising speed of the upward flow of the water to be treated is not increased more than necessary, and the three-phase separation is efficiently performed.

According to the fifth aspect, the gas discharge pipe is connected to a seal pot attached to the outside of the treatment tank and is sealed with treated water, so that the structure inside the treatment tank is simplified and the equipment cost is reduced. Will also be cheaper.

In claim 6, the rectifying zone between the lower three-phase separating member and the upper three-phase separating member has a height of 5 to 30%, preferably 10 to 20% of the effective water depth in the treatment tank. In addition, since the turbulent state is sufficiently removed and rectified, the sludge settles efficiently.

According to the present invention, when the liquid is extracted from the rectification zone and circulated to the water supply means, the liquid ascending speed at the lower three-phase separating member is 60 to 90 m / hr, and the upper three-phase separating member. By flowing upward at a liquid rising speed of 30 m / hr or less at the separation member portion, turbulence does not occur more than necessary, and the three-phase separation efficiency is high.

According to the present invention, when a part of the treated water is circulated to the treated water supply means, the liquid ascending speed at the lower and upper three-phase separation members is set to 30 m / hr or less. By doing so, turbulence does not occur more than necessary, and the three-phase separation efficiency is high.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an upflow anaerobic treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an upflow anaerobic treatment device according to another embodiment of the present invention.

FIG. 3 is a plan view of a three-layer separating member according to the embodiment;

FIG. 4 is a plan view of a three-layer separating member according to another embodiment.

FIG. 5 is an explanatory diagram of an upflow anaerobic treatment device according to an embodiment of the present invention.

[Explanation of symbols]

 1: Anaerobic treatment tank 2: Lower three-phase separation member 3: Upper three-phase separation member 4a, 5a: Lower row gas collector 4b, 5b: Upper row gas collector 6: Gas recovery hood 7: Seal pot 8: Cover Treated water supply means 9: Treated water discharge means 10: Gas discharge means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyo Shinichiro 2-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term in Mitsubishi Kakoki Co., Ltd. (reference) 4D040 AA01 AA31

Claims (8)

[Claims] 1. An anaerobic treatment tank having a treated water supply means in a lower part, a treated water discharge means and a gas discharge means in an upper part, and a sludge bed formed by self-agglomerated sludge below the inside. In an upward flow anaerobic treatment apparatus for processing by flowing upward, a plurality of gas recovery hoods having a gas discharge pipe on the upper part are provided at a position higher than at least 1/2 of the effective water depth in the treatment tank. A gas collector disposed at a predetermined interval in the horizontal direction is provided with an upper gas collector in which a gas recovery hood is located with a certain gap above an opening which is an upward flow passage of the lower gas collector and the lower gas collector. Provide a lower three-phase separation member for separating gas, liquid and sludge configured in two rows, and an upper three-phase separation member having substantially the same configuration as the lower three-phase separation member at a position higher than the lower three-phase separation member. The lower three-phase separation member and the upper three Rectifying zone between the separating member - ting with upflow anaerobic treatment apparatus, characterized in that the. 2. The upwardly directed area of each of the lower three-phase separation member and the upper three-phase separation member is the same as the horizontal sectional area of the processing tank. Flow anaerobic treatment equipment. 3. The horizontal cross-sectional area of each of the processing tanks, wherein the total cross-sectional area of the opening, which is an upward flow passage formed by a plurality of gas recovery hoods, in the lower row and the upper row of gas collector hoods, respectively. 3. The method according to claim 1, wherein the ratio is 30% to 70%.
Or the upflow anaerobic treatment device according to claim 2. 4. A total cross-sectional area of an opening, which is an upward flow passage formed by a lower row and an upper row gas collector in the gas collector, is 30% of a horizontal cross-sectional area of the processing tank.
% To 70%.
The upflow anaerobic treatment device according to any one of the above. 5. The gas collector according to claim 1, wherein a gas discharge pipe provided above a plurality of gas recovery hoods in the gas collector is connected to a seal pot provided outside the processing tank and is sealed with water. The upflow anaerobic treatment device according to any one of claims 1 to 4, characterized in that: 6. A rectifying zone between the lower three-phase separating member and the upper three-phase separating member, wherein the rectifying zone has an effective water depth of 5 to 30 within the treatment tank.
%, Preferably 10 to 20% of the height of the upflow anaerobic treatment device according to any one of claims 1 to 5, characterized in that. 7. An anaerobic and biological treatment of organic matter by supplying treated water from a treated water supply means at a lower portion and flowing upwardly through a sludge bed of self-granulated sludge formed below the inside. And the liquid rising speed at the lower three-phase separation member is 60 to 90 m / hr.
The gas, liquid and sludge are separated and the gas is recovered by a gas recovery hood, the sludge is further settled by a rectifying zone, and the liquid is extracted from the rectifying zone to be treated. Circulating to the water supply means, flowing upward with the liquid rising speed at the upper three-phase separation member portion being 30 m / hr or less, extracting and discharging treated water from the treated water discharge means on the upper side, and gas from the gas discharge means. Upflow anaerobic treatment method, characterized by recovering water. 8. An anaerobic and biological treatment of organic substances by supplying treated water from a treated water supply means at a lower portion and flowing upward through a sludge bed of self-granulated sludge formed below the inside. Then, the liquid is circulated upward at a liquid rising speed of 30 m / hr or less at the lower three-phase separation member section, gas, liquid and sludge are separated, and the gas is recovered by a gas recovery hood. The sludge is settled, and the liquid rising speed at the upper three-phase separation member is 30 m / h.
r upward flow, draw out the treated water from the upper treated water discharge means, circulate a part to the treated water supply means,
An upflow anaerobic treatment method characterized by discharging the remainder out of the system and recovering gas from gas discharging means.