JP2007144401A - Biological reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological reactor having a high efficiency of gas-liquid-solid separation and hence capable of enhancing the biological reaction efficiency in a vessel. <P>SOLUTION: The area of the vessel 1 from around the middle part to the bottom part forms a biological reaction zone S where sludge floats. Raw water undergoes an anaerobic biological treatment in the biological reaction zone S and is introduced into a gas-liquid-solid separator 4 installed in the upper part of the vessel 1 for the gas-liquid-solid separation. The treated water via the gas-liquid-solid separation process is discharged out of the vessel 1 through a treated water discharging conduit 6. The solid matter settles in the gas-liquid-solid separator 4 and is returned to the biological treatment zone S in the vessel 1 through a solid matter discharging conduit 7. The separator 4 is internally installed with baffles 21 to 24, each of which is made of an annular sheet in a tapered form whose diameter becomes smaller toward the lower portion. Each baffle 21 to 24 is disposed concentrically with a space in between. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bioreactor suitably used for biological treatment of wastewater, and more particularly to a bioreactor provided with a gas-liquid solid separation chamber in the upper part of a bioreaction container.

For biological treatment of organic wastewater, UASB (Upflow Anaerobic Sludge Blanket) or EGSB (Expanded Granular Sludge Bed) type biological treatment equipment is widely used. According to these UASB and EGSB treatments, organic substances in the wastewater are converted into methane and CO ₂ gas by anaerobic biological treatment. Therefore, biological treatment for water gas (methane, CO _2), will include liquid (water) and solid (sludge). In order to efficiently perform the UASB and EGSB processes, it is necessary to perform gas-liquid solid separation so that the solid content does not flow out.

Japanese Patent Application Laid-Open No. 10-165980 and Japanese Patent Application Laid-Open No. 7-507233 disclose gas-liquid solid separation for separating and separating solids in the upper part of a biological treatment reaction tank such as the UASB method and for floating and separating gases. It is described that a vessel is provided.
JP-A-10-165980 Japanese National Patent Publication No. 7-507233

  The gas-liquid solid separator used in the above-mentioned JP-A-10-165980 and JP-A-7-507233 has a simple structure and low gas-liquid solid separation efficiency.

  An object of the present invention is to provide a bioreactor that has high gas-liquid solid separation efficiency and can therefore increase the bioreaction efficiency in the container.

  The bioreactor according to claim 1 is a container in which a biological reaction process of a liquid is performed, and a liquid that is provided in an upper part of the container and into which the liquid flows, and the solid content in the liquid is settled and separated. And a gas-liquid solid separation chamber in which gas separation is performed, a tapered shape that is concentrically arranged in the gas-liquid solid separation chamber and spaced apart from each other, and has a smaller diameter toward the bottom. A plurality of baffles having the above are provided.

A bioreactor according to a second aspect is the bioreactor according to the first aspect, wherein the gas-liquid solid separation chamber includes an upper cylindrical portion and a conical portion connected to the lower side of the cylindrical portion. A solid content discharge pipe for allowing the settled solid content to flow out downward from the gas-liquid solid separation chamber by gravity extends downward from the lower end of the conical portion, and the vertical length of the solid content discharge pipe h ₂ is not less than 0.1 times the inner diameter d ₁ of the cylindrical portion.

  The bioreactor according to claim 3 is the bioreactor according to claim 2, wherein the solid content discharge pipe is inclined with respect to a vertical direction, and an opening at a lower end of the solid content discharge pipe is laterally or obliquely upward. It is characterized by becoming.

  The biological reactor according to claim 4 is the bioreactor according to claim 2 or 3, wherein the gas in the gas-liquid solid separation chamber or the solid content discharge pipe is supplied to the lower part of the gas-liquid solid separation chamber or the upper part of the solid content discharge pipe. A gas vent hole for allowing the liquid-solid separation chamber or the solid content discharge pipe to flow out is provided.

  The bioreactor according to claim 5 is the bioreactor according to claim 2, wherein the solid content discharge pipe is an upper pipe extending in a vertical direction, and a lower pipe connected to the upper pipe and extending laterally or obliquely downward. The opening at the end of the lower tube is characterized by being laterally or obliquely upward.

  The bioreactor according to claim 6 is the bioreactor according to claim 5, wherein a gas vent hole for allowing the gas in the solid content discharge pipe to flow out of the solid content discharge pipe is provided in the lower part of the upper pipe or the lower pipe. It is characterized by that.

  The bioreactor according to claim 7 is the bioreactor according to any one of claims 1 to 6, wherein an upper end of the outermost baffle is continuous with an inner surface of the gas-liquid solid separation chamber, An inflow portion is provided so as to allow the liquid in the container to flow into the gas-liquid solid separation chamber in a substantially tangential direction with respect to the baffle on the outermost periphery.

  The bioreactor according to claim 8 is the bioreactor according to claim 7, wherein a gas vent for allowing gas to flow out from between the inner surface of the gas-liquid solid separation chamber and the outermost peripheral baffle to the outside of the cylindrical portion. Is provided.

  In the bioreactor of the present invention, a plurality of baffles are provided concentrically in the gas-liquid solid separation chamber in the upper part of the reaction vessel, and the gas-liquid solid separation efficiency is high. For this reason, the biological treatment reaction efficiency in a container can be made high.

  When the solid content discharge pipe is extended downward from the gas-liquid solid separation chamber as in claim 2, the solid content stays in the discharge pipe and gradually flows out from the discharge pipe toward the lower part of the container by gravity. Since solids having a higher density (specific gravity) than the liquid stays in the discharge pipe, the liquid does not flow back from the discharge pipe to the gas-liquid solid separation chamber, and the gas-liquid solid separation efficiency in the gas-liquid solid separation chamber is high. Maintained on things.

  According to the third and fourth aspects, the solid content is easily retained in the discharge pipe by inclining the solid content discharge pipe or by setting the lower pipe to be horizontal or obliquely downward. Moreover, by making the lower end or the end opening of the solid content discharge pipe laterally or obliquely upward, the gas generated in the reaction vessel is reliably prevented from flowing into the discharge pipe.

Since the solid content stays from the lower part in the gas-liquid solid separation chamber to the discharge pipe, the gas can be extracted from the retained solid content by providing a gas vent hole in this portion as in claim 5. Thereby, the buoyancy of the gas is prevented or suppressed from acting on the staying solid content, and the solid content smoothly passes through the discharge pipe downward.
In the case where a horizontal or obliquely downward lower pipe is provided at the lower part of the solid content discharge pipe as in the sixth aspect of the invention, it is possible to satisfactorily retain the solid by providing a vent hole in the lower or lower pipe of the upper pipe. Degas from the minute.

  The liquid swirl is formed in the gas-liquid solid separation chamber by allowing the liquid to flow in a tangential direction between the outermost baffle and the gas-liquid solid separation chamber surface as in the seventh aspect, and the gas-liquid solid separation is performed. Will be done very well.

  As described in claim 8, by providing a gas vent in the cylindrical portion so as to extract gas from a portion between the outermost baffle and the gas-liquid solid separation chamber inner surface, gas can be accumulated in the contact portion. Is prevented. Thereby, the liquid flows smoothly into the gas-liquid solid separation chamber.

  Hereinafter, embodiments will be described with reference to the drawings.

[Bioreactor in which the entire solid content discharge pipe is inclined]
FIG. 1 is a longitudinal sectional view of a bioreactor according to an embodiment in which the entire solid content discharge pipe is inclined, FIG. 2 (a) is an enlarged view of the upper part of the bioreactor of FIG. (B) is a plan view of the gas-liquid solid separator, and FIG. 3 is a longitudinal sectional view of the baffle. FIG. 2 (a) shows a cross section taken along line AA in FIG. 2 (b). FIG. 4 (a) is an enlarged view of an upper part of a bioreactor according to another embodiment, and FIG. 4 (b) is a perspective view of the gas-liquid solid separator of FIG. 4 (a).

  In the embodiment shown in FIG. 1 to FIG. 3, the container 1 has a cylindrical shape, and raw water is supplied from the raw water pipe 2 to the distributor 3 in the lower part of the container 1, Introduced at the bottom.

  A biological reaction zone S in which sludge floats is located in the middle of the container 1 or slightly from near the top to the bottom. The raw water is subjected to anaerobic biological treatment in the biological reaction zone S, and then introduced into the gas-liquid / solid-separator 4 (gas-liquid / solid separation chamber) in the upper part of the container 1 for gas-liquid / solid separation.

  Most of the gas leaves the water surface in the container 1 without entering the gas-liquid solid separator 4 and is discharged out of the container 1 through the gas vent 5 at the top of the container 1. A part of the gas flows into the gas-liquid solid separator 4 and is discharged out of the gas-liquid solid separator 4 from a gas vent 10a described later to leave the water surface in the container 1, or The water surface of the gas-liquid solid separator 4 is removed and discharged from the gas vent 5. The treated water that has been gas-liquid-solid separated in the gas-liquid solid separator 4 is taken out of the container 1 through the treated water extraction pipe 6. The solid content settles in the gas-liquid solid separator 4 and is returned to the biological reaction zone S in the container 1 through the solid content discharge pipe 7.

  The configuration of the gas-liquid solid separator 4 will be described with reference to FIG. 2 and FIG.

The outer shell of the gas-liquid solid separator 4 includes an upper cylindrical portion 10 and a conical portion 11 having a tapered shape that is continuous with the lower side of the cylindrical portion 10 and has a diameter that decreases downward. A solid content discharge pipe 7 is connected to the lower end of the conical portion 11. In this embodiment, the entire solid content discharge pipe 7 is inclined. However, the solid content discharge pipe 7 may be provided so as to extend in the vertical direction, and the vicinity of the lower end of the discharge pipe 7 is inclined. Although the lower end of the opening of the exhaust extraction tube 7 has a slanting upward may be sideways, the angle theta ₃ is preferably 0 to 20 °, especially 10 to 15 °.

  A trough 12 for overflowing treated water is provided in the upper part of the cylindrical portion 10. The treated water extraction pipe 6 (not shown in FIGS. 2 to 4) is connected to the cylindrical portion 10 so as to take out treated water that has passed through the trough 12.

  In the vicinity of the lower portion of the cylindrical portion 10, an inlet 13 for allowing biological reaction water to flow into the gas-liquid solid separator 4 is provided. In the embodiment shown in FIG. 2, a guide 13 a is provided on the outer surface of the cylindrical portion 10 to guide water so that water flows into the cylindrical portion 10 from the inlet 13 into the tangential direction. The inflow part of water is comprised by this inflow port 13 and the guide 13a. In this embodiment, the inflow linear velocity of water from the inlet 13 (the velocity obtained by dividing the amount of treated water by the area of the inlet 13) is 2 to 8 cm / s, particularly 4 to 6 cm / s. preferable.

  A jet nozzle 14 is provided at the lower part of the conical part 11 to eject water toward the solid content discharge pipe 7 so that the lower part of the conical part 11 and the solid content discharge pipe 7 can be cleaned. The jet nozzle 14 can be supplied with high-pressure water from a pump (not shown) via a pipe 15. However, the jet nozzle 14 may be omitted.

  In this embodiment, a gas pocket 16 for collecting gas is provided at the upper part of the solid content discharge pipe 7, and a gas vent hole 17 for discharging gas from the gas pocket 16 to the outside of the discharge pipe 7 is provided. It has been. However, the gas pocket 16 and the gas vent hole 17 may be omitted.

  Baffles 21 to 24 made of an annular plate material having a tapered shape with a smaller diameter toward the lower side are provided in the cylindrical portion 10. Each baffle 21-24 is arrange | positioned concentrically at intervals. In this embodiment, a total of four baffles are provided from the innermost baffle 21 to the outermost baffle 24, but the number of baffles is not limited to four.

  The upper end of the outermost baffle 24 is in contact with or fixed to the inner peripheral surface of the cylindrical portion 10. The inlet is opened between the outermost baffle 24 and the inner peripheral surface of the cylindrical portion 10.

  In this embodiment, as shown in FIG. 2, a notch-like gas vent 10a is provided directly below the contact portion or the fixed portion between the upper end of the outermost baffle 24 and the inner peripheral surface of the cylindrical portion 10. In addition, the gas can be extracted out of the gas-liquid solid separator 4 from between the baffle 24 and the inner peripheral surface of the cylindrical portion 10. By providing the gas vent 10a, gas does not accumulate between the baffle 24 and the inner peripheral surface of the cylindrical portion 10, and water flows smoothly from the inlet 13. As shown in FIG. 3, the baffle 23 on the outer peripheral side extends longer than the baffles 21 and 22 on the inner peripheral side, and the baffle 24 on the outermost periphery extends further downward below the baffle 23. Is preferred.

  In the thus configured bioreactor, raw water is introduced from the distributor 3 into the bioreaction zone S, treated with anaerobic organisms, and then introduced into the gas-liquid solid separator 4 (gas-liquid solid separation chamber). .

  This biological reaction water flows into the gas-liquid solid separator 4 from the inlet 13 and is subjected to gas-liquid solid separation processing. When this biological reaction water comes into contact with the baffles 21 to 24, this gas-liquid solid separation process is efficiently performed. The gas separated from the water is discharged from the gas discharge port 5. The water that has passed through the trough 12 is taken out from the treated water outlet pipe 6.

  The solid content (sludge) settled on the conical part 11 in the gas-liquid solid separator 4 gradually moves downward in the conical part 11 and the solid content discharge pipe 7 due to gravity, and the biological matter is released from the lower end of the discharge pipe 7. It falls toward the reaction zone S.

  In this embodiment, since the baffles 21 to 24 are provided, the gas-liquid solid separation in the gas-liquid solid separator 4 is efficiently performed. And since the solid content fully concentrated is returned to the biological reaction zone S via the discharge pipe 7, the biological reaction in this biological reaction zone S is performed efficiently.

  In this embodiment, the gas generated from the sludge in the discharge pipe 7 flows out of the discharge pipe 7 through the gas pocket 16 and the gas vent hole 17, so that the gas is formed in the upper part of the discharge pipe 7 and the lower part of the conical part 11. The retention of gas is prevented or suppressed. For this reason, the buoyancy of the gas is prevented or suppressed from acting on the sludge, and the sludge is smoothly discharged from the discharge pipe 7. Note that the vent hole 17 may be provided in the lower part of the conical part 11.

In this embodiment, since sludge stays in the discharge pipe 7 from the lower part of the conical part 11 in this way, the treated water does not flow back into the discharge pipe 7 from the lower end of the discharge pipe 7 or the gas vent hole 17. . Further, since the opening at the lower end of the discharge pipe 7 is inclined upward as shown by the angle θ ₃ , the reaction gas rising in the container 1 is also prevented from flowing into the discharge pipe 7. In addition, the lower end of the discharge pipe 7 may be turned sideways.

  Next, preferred dimensions, operating conditions, etc. of each part of the bioreactor of the above embodiment will be described.

The diameter d ₁ of the cylindrical portion 10 of the gas-liquid solid separator 4 is preferably 60 to 90%, particularly 70 to 85% of the diameter of the cylindrical container 1.

The height h ₁ of the cylindrical portion 10 is preferably 250 cm or less, particularly 50 to 200 cm.

It is preferable inclination angle theta ₁ with respect to the horizontal plane of the conical portion 11 is 45 to 60 °, especially 50 to 60 °.

The inclination angle θ ₂ of the baffles 21 to 24 with respect to the horizontal plane is preferably 45 to 60 °, particularly 50 to 60 °.

  The diameter of the solid content discharge pipe 7 (average diameter in the case of a non-circular pipe) is 50 to 150% of the diameter of the inlet 13 and is preferably 50 mm or more.

The vertical length (height) h ₂ of the solid content discharge pipe 7 is preferably 10% or more of the diameter d ₁ of the gas-liquid solid separator 4, for example, 10 to 70%, and preferably 30 to 80%. More preferred.

It is preferable inclination angle theta ₄ with respect to the horizontal plane of the solids discharge pipe 7 is 45 to 135 °, especially 50 to 130 °.

  The number of vent holes 10a provided in the cylindrical portion 10 is preferably 4 or more.

  The number of baffles is preferably 1 to 10, particularly 4.

The length h ₃ from the contact portion or the fixed portion between the outermost baffle 24 and the inner peripheral surface of the cylindrical portion 10 to the lower end of the cylindrical portion 10 is 1 to ₃ of the diameter of the inlet 13 or the vertical width of the inlet 13. In particular, it is preferably 1.5 to 2 times.

The height h ₄ of the outermost peripheral baffle 24 is preferably 1 to 2 times, particularly 1.25 to 1.5 times the height h ₃ .

The empty cylinder speed in the container 1 is preferably 7 m / h or less. The COD load in the container 1 is preferably 30 kg-COD / m ³ · d or less, and more preferably 25 kg-COD / m ³ · d or less.

  In the above embodiment, the jet nozzle 14 is provided along the inner surface of the conical portion 11, but may be provided vertically as shown in FIG.

  FIG. 4 (a) is an enlarged view of an upper part of a bioreactor according to another embodiment, and FIG. 4 (b) is a perspective view of the gas-liquid solid separator.

  In the embodiment shown in FIG. 4, a living organism enters the gas-liquid-solid separator 4A from a plurality of horizontally long rectangular inlets 13A provided over substantially the entire circumference of the cylindrical portion 10 of the gas-liquid-solid separator 4A. Let the reaction water flow in. Each inflow port 13 </ b> A is provided so as to surround the outside of the baffle 24.

  In the embodiment shown in FIG. 2, the biological reaction water is allowed to flow tangentially into the gas-liquid solid separation chamber, whereby a swirl flow is formed in the gas-liquid solid separation chamber, and the gas-liquid solid separation is performed efficiently. On the other hand, in the embodiment of FIG. 4, the sedimentation efficiency of the solid in the gas-liquid solid separation chamber is obtained by reducing the inflow rate of the biological reaction water by increasing the inlet of the biological reaction water. It is what raises.

  In the case of FIG. 4, the diameter of the solid content discharge pipe 7 (average diameter in the case of a non-circular pipe) is 50 to 100% of the vertical width of the inlet 13A, and preferably 50 mm or more.

  The other structure of FIG. 4 is the same as that of FIG. 2, and the same code has shown the same part. In the embodiment of FIG. 4, the inlet 13 </ b> A is provided in a slit shape, but the shape of the inlet 13 </ b> A is not particularly limited as long as it is provided over substantially the entire circumferential direction of the cylindrical portion 10. In this embodiment, the inflow linear velocity of water from the inflow port 13A is preferably 5 cm / s or less, particularly 1 to 4 cm / s.

  In any of the above embodiments, the container 1 has a cylindrical shape, but may have an elliptical cylindrical shape, a rectangular cylindrical shape, or the like, for example, a rectangular cylindrical shape. The quadrangular cylindrical shape may be a square cylindrical shape or a rectangular cylindrical shape.

  In the above embodiment, one gas-liquid solid separator 4, 4 </ b> A is provided in the upper part of the container 1, but a plurality of gas-liquid solid separators may be provided.

  FIG. 5 shows an example thereof, and six gas-liquid solid separators 4 are installed in a rectangular container 1A. The treated water from each gas-liquid solid separator 4 is collected in the collecting pipe 6A and discharged. Each gas-liquid solid separator 4 is preferably supported by a beam-like member (not shown) installed on the top of the container 1A.

  Although the said embodiment is comprised so that the sludge in the gas-liquid solid separator 4 may be discharged | emitted by gravity, you may be attracted | sucked and discharged | emitted by the pump.

  FIG. 6 shows an example, and the solid content discharge pipe 7 of each gas-liquid solid separator 4 is connected to the collecting pipe 7A and is returned to the biological reaction zone S via the pump P. Yes. In FIG. 6, a plurality of gas-liquid solid separators 4 are installed. However, in FIG. 1, sludge may be drawn from the discharge pipe 7 via a pump. The drawn sludge is preferably returned to the biological reaction zone of the container 1A.

[Bioreactor whose solid content discharge pipe consists of a vertical upper pipe and a horizontal or diagonally lower lower pipe]
FIG. 7 is a cross-sectional view showing an embodiment of a bioreactor in which the solid content discharge pipe is composed of a vertical upper pipe and a horizontal or obliquely downward lower pipe, as in FIG. It is sectional drawing.

Also in this embodiment, the gas-liquid solid separator 4D is installed in the upper part of the container 1. This gas-liquid solid separator 4D has a structure similar to that of the gas-liquid solid separator 4 of FIG. 2, except that an upper pipe 7a in which a solid content discharge pipe 7D is vertical and the upper pipe 7a. that consists the lower tube 7b which extends obliquely downward in the slope angle theta ₅ contiguous to, and the jet nozzle 14 and the pipe 15 connected to it are arranged vertically in the axial portion of the gas-liquid-solid separator 4D It is a point.

The upper end 7 a of the solid content discharge pipe 7 </ b> D is connected to the lower end of the conical part 11. The lower pipe 7b extends obliquely downward from the lower end of the upper pipe 7a. Of the upper surface portion of the lower pipe 7b, a gas pocket 16 and a gas vent hole 17 for venting gas from the solid content discharge pipe 7D are provided in a portion closest to the upper pipe 7a. End of the opening of the lower tube 7b, only the angle theta ₃ has a obliquely upward. Note that the vent hole may be provided in the lower portion of the upper tube 7a.
Other configurations are the same as those of the embodiment shown in FIGS. 1 to 3, and the same reference numerals denote the same parts.

The preferred ranges of the angles θ ₁ , θ ₂ , θ _{3 in} FIG. 7 are the same as above. The gradient angle θ ₅ of the lower tube may be 0 ° to 90 °, but is more preferably 45 ° to 90 °, particularly 60 to 80 °.

The preferred range of the dimensions of each part in FIG. 7 is the same as that of the above embodiment. Horizontal length of the lower tube 7b is about 5% to 90% of the height _{h 2} of the solids discharge pipe 7D are preferred.

  Also in the bioreactor having the configuration shown in FIG. 7, the same effects as those of the bioreactor shown in FIGS.

  FIG. 7 shows that the solid content discharge pipe 7D is composed of the upper pipe 7a and the lower pipe 7b in FIGS. 1 to 3, but as described above, also in the bioreactor of FIGS. 4 to 6. The solid content discharge pipe may be composed of an upper pipe 7a and a lower pipe 7b.

It is a longitudinal cross-sectional view of the bioreactor which concerns on embodiment. FIG. 2 (a) is an enlarged view of the upper part of the bioreactor of FIG. 1, and FIG. 2 (b) is a plan view of the gas-liquid solid separator. It is a longitudinal cross-sectional view of a baffle. FIG. 4 (a) is an enlarged view of an upper part of a bioreactor according to another embodiment, and FIG. 4 (b) is a perspective view of a gas-liquid solid separator. It is a top view which shows another embodiment. It is a top view which shows another embodiment. It is a longitudinal cross-sectional view of the bioreactor which concerns on different embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A container 4,4A, 4D Gas-liquid solid separator 7,7D Solid content discharge pipe 7a Upper pipe 7b Lower pipe 10 Cylindrical part 10a Gas vent 11 Conical part 13,13A Inlet 14 Jet nozzle 17 Gas vent 21 ~ 24 baffle

Claims (8)

A container in which a liquid biological reaction process is performed,
In a bioreactor having a gas-liquid solid separation chamber provided in an upper part of the container, in which a liquid flows in from the container and in which the solid content in the liquid is separated and the gas is separated by floating,
A bioreactor characterized in that a plurality of baffles having a tapered shape having a smaller diameter toward the lower side are provided in the gas-liquid solid separation chamber so as to be concentrically spaced from each other. In Claim 1, the gas-liquid solid separation chamber includes an upper cylindrical portion and a conical portion connected to the lower side of the cylindrical portion,
A solid content discharge pipe for allowing the solid content settled in the gas-liquid solid separation chamber to flow downward by gravity from the gas-liquid solid separation chamber is extended downward from the lower end of the conical portion,
Vertical length h ₂ of the solid content discharge pipe, bioreactor, characterized in that 0.1 times the inner diameter d ₁ of the cylindrical portion. In Claim 2, the solid content discharge pipe is inclined and extended with respect to the vertical direction,
The bioreactor characterized in that the opening at the lower end of the solid content discharge pipe is laterally or obliquely upward.   4. The gas-liquid solid separation chamber or the solid content discharge pipe according to claim 2 or 3, wherein the gas in the gas-liquid solid separation chamber or the solid content discharge pipe is supplied to the lower part of the gas-liquid solid separation chamber or the upper part of the solid content discharge pipe. A bioreactor characterized by being provided with a vent hole for flowing out. The solid content discharge pipe according to claim 2, wherein the solid content discharge pipe extends in a vertical direction;
Continuing from the upper pipe, it consists of a lower pipe extending sideways or diagonally downward,
A bioreactor characterized in that the opening at the end of the lower pipe is laterally or obliquely upward.   6. The biological reaction according to claim 5, wherein a gas vent hole for allowing the gas in the solid content discharge pipe to flow out of the solid content discharge pipe is provided in the lower part of the upper pipe or in the lower pipe. vessel. In any one of Claims 1 thru | or 6, the upper end of the outermost periphery baffle is connected with the inner surface of the said gas-liquid solid separation chamber,
An inflow portion is provided between the inner surface of the gas-liquid solid separation chamber and the outermost peripheral baffle so that the liquid in the container flows into the gas-liquid solid separation chamber in a substantially tangential direction. Bioreactor.   8. The cylindrical portion according to claim 7, wherein a gas vent is provided in the cylindrical portion for allowing gas to flow out of the cylindrical portion from between the inner surface of the gas-liquid solid separation chamber and the outermost baffle. Bioreactor.

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