JP6048557B1 - Anaerobic treatment apparatus and anaerobic treatment method - Google Patents

Abstract

An anaerobic treatment apparatus having a function for preventing a carrier from flowing out of an anaerobic treatment tank filled with a fluid carrier is intended to reduce the number of equipment and the installation space. An anaerobic treatment apparatus 10 is filled with a carrier having fluidity. The raw water flows into the tank from the bottom, is treated in the biological treatment chamber A, and then flows into the carrier-containing water receiving chamber B through the carrier drawing channel 14 with a part of the carrier. Treated water is removed through screen 12. The carrier settles in the receiving chamber B and returns to the biological treatment chamber A from the carrier return channel 15. [Selection] Figure 1

Description

  The present invention relates to an anaerobic treatment apparatus and anaerobic treatment in which a reaction carrier is filled with a fluid carrier, a biological film is formed on the surface of the carrier, and the treatment water is passed under anaerobic conditions. Regarding the method.

  As an anaerobic treatment method for organic wastewater, a sludge blanket is formed by forming granular sludge with high density and high sedimentation in the reaction tank, and upwardly circulating organic wastewater containing soluble BOD. The UASB (Upflow Anaerobic Sludge Blanket) method, which performs high-load and high-speed processing by contacting with a slab, is employed. In this method, solid organic substances with a low digestion rate are separated and treated separately, and only soluble organic substances with a high digestion rate are processed at high speed with high load by anaerobic treatment using granular sludge with high anaerobic microorganism density. It is. In addition, as a development of this UASB method, EGSB is used to conduct anaerobic treatment at a higher load by passing water at a higher flow rate using a high-height reaction vessel, deploying a sludge blanket at a higher deployment rate. (Expanded Granule Sludge Blanket) method is also performed.

  Anaerobic treatment using granular sludge, such as UASB method and EGSB method, is a method in which sludge containing anaerobic microorganisms is maintained and grown in a granular state for treatment. This method can achieve a high sludge retention concentration compared to the treatment with a fixed bed or fluidized bed that holds sludge on the carrier, so that it can be operated at a high load, and surplus sludge from an already operating treatment system. Can be started up in a short period of time, and is generally recognized as the most efficient anaerobic treatment method.

However, these methods using granular sludge are very efficient when the COD concentration of the wastewater is high (COD _Cr concentration is approximately 2000 mg / L or more), but when the COD concentration is low (COD _Cr concentration is approximately 2000 mg). / L or less), it is necessary to flow a large amount of water into the reaction tank, and there is a tendency that the risk of granule outflow increases and stable performance cannot be exhibited.

  It is also known that depending on the type of drainage, there is drainage in which granule is difficult to form, and the initially charged granule gradually dismantles, making it impossible to operate.

  On the other hand, in the method using a fluid non-biological carrier, it is possible to prevent the carrier from flowing out of the reaction tank by a mechanical method such as a screen, and the carrier surface can always be secured as a place for growing microorganisms. There is an advantage that it can be applied to low-concentration COD wastewater and wastewater in which granules are dismantled.

  In addition, the non-biological carrier has a high degree of freedom in designing the specific gravity and size, and the sedimentation rate can be set very large as compared with granules. If a carrier with a high sedimentation rate is used, a mechanism for gas-liquid solid separation (GSS: Gas Solid Separator), which is required in the granule method, becomes unnecessary, and the effective volume of the reaction vessel is increased and the construction cost is greatly increased. There is also an advantage that it can be suppressed.

  However, in the method using a fluid non-biological carrier, microorganisms adhere to the carrier, a biofilm is formed on the surface of the carrier, a reaction that generates gas inside the biofilm proceeds, and the generated gas adheres to the carrier. As a result, there is a problem that the apparent specific gravity of the carrier becomes small, and the carrier floats in the reaction tank and flows out together with the treated water. Such problems can be alleviated by using a carrier having a large specific gravity and a large sedimentation speed. However, in the case of a carrier having an excessively large specific gravity and an excessively large sedimentation speed, the contact efficiency with the water to be treated. However, there is a problem that sufficient processing efficiency cannot be obtained and solid matter accumulates in the sedimentation layer of the settled carrier and the flow path is blocked. On the other hand, when a carrier that does not have such a problem is used It is difficult to avoid the floating and outflow of the carrier due to the generated gas.

  Patent Documents 1 and 2 propose an apparatus in which the floated carrier is extracted from the reaction tank, and the extracted carrier is returned to the reaction tank again by a circulation pipe routed outside the reaction tank. FIG. 6 is a flowchart of the anaerobic processing apparatus of Patent Document 1.

This anaerobic treatment apparatus treats water to be treated (raw water) in the acid generation tank 1, then feeds it to the pH adjustment tank 2 to adjust the pH, and the pH-adjusted water is supplied to the fluid abiotic carrier 4 by the pump P _1. The water is treated by passing water upward in the reaction tank 3 filled with the above. On the upper side wall of the reaction tank 3, there is provided an outflow pipe 5A for extracting the treated water in the reaction tank 3 together with the carrier that has floated up. Has been.

The outlet side of the bubble separation pipe 5 opens into the treated water tank 6 whose bottom surface is inclined. 6A is a screen. The treated water containing the floating carrier flowing out from the reaction tank 3 flows down the bubble separation pipe 5 through the outflow pipe 5A, and is then fed to the treated water tank 6 having the screen 6A. The carrier in the treated water that has flowed out of the reaction tank 3 recovers its sedimentation by separating and removing bubbles while flowing down the bubble separation pipe 5, and quickly settles in the treated water tank 6. A part of the permeated water of the screen 6 </ b> A of the treated water tank 6 is discharged out of the system as treated water, and the remainder is circulated to the acid generation tank 1. Meanwhile, the carrier of sediment in the process water tank 6 is returned to the reaction vessel 4 with the treated water by a pump P _2. 1A and 2A are pH meters.

  In the above-described anaerobic treatment apparatus, it is necessary to separately provide a treatment water tank 6 for circulating the carrier, and additionally, an additional facility for treating bubbles (methane gas) separated from the carrier is also necessary. There are problems that the number of components increases and the installation area increases.

  Patent Documents 3 and 4 describe that an anaerobic reaction tank is provided with a carrier separation screen in the treated water discharge section at the top of the tank.

  However, the screen is prone to clogging and needs frequent maintenance.

JP2012-110820 JP 2014-237102 A JP2013-240768A JP2013-208563A

  An object of the present invention is to reduce the number of equipment and the installation space in an anaerobic treatment apparatus having a function for preventing the outflow of a carrier from an anaerobic treatment tank filled with a fluid carrier. .

  Moreover, an object of this invention is to provide the anaerobic processing method using this anaerobic processing apparatus.

The anaerobic treatment apparatus of the present invention treats water to be treated by passing water to be treated into a tank filled with a fluid nonbiological carrier under anaerobic conditions to form a biofilm on the surface of the nonbiological carrier. In the anaerobic treatment apparatus, a pair of rectifying plates, a biological treatment chamber, and a carrier-containing water receiving chamber having a treated water extraction portion are disposed in the tank, The carrier is drawn at a distance so as to form a carrier drawing channel, the carrier sedimentation speed is 200 to 500 m / hr, and the inside of the tank sandwiches the pair of rectifying plates. as adjacent, it has a said biological treatment chamber which carrier flows are divided into a said carrier containing water receiving chamber is isolated from convection of the organism processing chamber, the the carrier pull-channel gradient The upper end side of the carrier drawing channel is connected to the biological treatment chamber, and the lower end side is connected to the carrier-containing water receiving chamber. Is location, the flow path width of the carrier pull-channel (interval of the rectifying plates are) is 20 to 50 times the average particle size of the carrier, a 25～250Mm, flow path length of the carrier pull-passage 50 to 500 mm , wherein a part of the carrier-containing water in the biological treatment chamber passes through the carrier drawing channel from the upper side to the lower side and flows into the carrier-containing water receiving chamber. It is what.

  In one aspect of the present invention, the width of the carrier drawing channel (interval between the rectifying plates) is 20 to 50 times the average particle size of the carrier, and the channel length of the carrier drawing channel is the average of the carrier. 50 to 100 times the particle size.

  In one aspect of the present invention, a carrier return channel is provided for returning the carrier that has settled in the carrier-containing water receiving chamber to the biological treatment chamber.

  The anaerobic treatment method of the present invention treats organic waste water using the anaerobic treatment apparatus of the present invention.

  In the anaerobic treatment apparatus of the present invention, the current plate is arranged in the vertical direction (including the oblique direction) in the tank, and the carrier drawing channel through which the carrier can pass downward is formed along the current plate. In the carrier-containing water receiving chamber, a treated water discharge part is provided above the outlet of the carrier drawing channel, a carrier separation screen is provided in the treated water discharge part, and the sedimentation speed of the carrier is 200 to 500 m / h. Therefore, the carrier settles in the carrier-containing water receiving chamber, hardly reaches the treated water discharge part, and the carrier is prevented from flowing out.

Therefore, according to the present invention, the following effects are produced.
(1) Installation of the carrier circulating water tank and the treated water tank is unnecessary, and the installation area can be reduced.
(2) The gas treatment incidental facilities set in the carrier circulation water tank are not required.
(3) Since a carrier to which bubbles do not adhere or a carrier to which bubbles slightly adhere but sediments passes through the carrier drawing channel, blockage of the screen due to floating of the carrier is difficult to occur.
(4) Since a carrier to which bubbles do not adhere or a carrier to which bubbles slightly adhere but sediments passes through the carrier drawing channel, the carrier settled in the carrier-containing water receiving chamber is returned to the tank. When the carrier return channel is provided, the carrier is smoothly returned from the carrier return channel to the biological treatment chamber without floating in the carrier-containing water receiving chamber.

(A) is a longitudinal cross-sectional view of the anaerobic processing apparatus which concerns on embodiment. (B) is the BB sectional drawing of (a). It is a longitudinal cross-sectional view of the anaerobic processing apparatus which concerns on embodiment. It is a longitudinal cross-sectional view of the anaerobic processing apparatus which concerns on embodiment. It is a longitudinal cross-sectional view of the anaerobic processing apparatus which concerns on embodiment. It is a longitudinal cross-sectional view of the anaerobic processing apparatus which concerns on embodiment. It is a flowchart of an anaerobic processing apparatus.

  Hereinafter, an example of the anaerobic treatment apparatus of the present invention will be described with reference to FIGS.

  The anaerobic treatment apparatus 10 of FIG. 1 introduces raw water from the bottom (may be a lower part) of a tank body 11 constituting a reaction tank, and makes it contact with a fluid carrier filled in the tank body 11. Configured to perform anaerobic biological treatment. The treated water passes through the carrier separation screen 12 provided at the upper part of the side surface in the tank body 11 and is taken out via the treated water take-out pipe 13.

  Rectifying plates 20 and 30 are provided so as to surround the screen 12. The tank body 11 includes a carrier-containing water receiving chamber B surrounded by a lower part of the rectifying plate 20 (below the part forming the carrier drawing channel) and the rectifying plate 30, and a biological treatment chamber A in which the carrier flows. It is partitioned. Both sides of the current plates 20 and 30 are connected to the tank body 11.

  The rectifying plate 30 is provided in the up-down direction (vertical direction in this embodiment), and its upper end protrudes above the water surface WL in the tank body 11. The lower end of the rectifying plate 30 is located about 50 to 500 mm lower than the upper end of the rectifying plate 20 and about 50 to 500 mm lower than the lower end of the carrier separation screen.

  The rectifying plate 20 faces the rectifying plate 30, is connected to the first vertical plate portion 20 a located closer to the biological treatment chamber A than the rectifying plate 30, and the lower end of the first vertical plate portion 20 a. An inclined portion 20b extending in a downward gradient toward the vicinity of the wall surface of the tank body 11 through the side, and a second vertical plate portion 20c extending downward from the lower end of the inclined portion 20b. Yes. A region sandwiched between the rectifying plate 20 and the rectifying plate 30 is a carrier drawing channel 14. A carrier return flow path 15 is formed between the second vertical plate portion 20 c and the inner wall surface of the tank body 11.

  Although illustration is omitted, a discharge part for biological treatment gas such as methane is provided at the top of the tank body 11.

  In the anaerobic treatment apparatus 10 configured as described above, the carrier-containing water including the carrier rolled up in the biological treatment chamber A flows into the carrier-containing water receiving chamber B through the carrier drawing channel 14. . The carrier in the carrier-containing water is solid-liquid separated into the carrier and the treated water while the carrier-containing water stays in the carrier-containing water receiving chamber B, and flows down along the inclined portion 20b. Returned to processing chamber A.

  The carrier drawing channel 14 has a channel width (horizontal distance between the first vertical plate portion 20a and the rectifying plate 30) that does not hinder the passage of the carrier, and the carrier to which bubbles are attached is difficult to pass. It is preferable to have a path length (a vertical distance from the upper end of the first vertical plate portion 20a to the lower end of the rectifying plate 30). Specifically, the channel width of the carrier drawing channel is preferably about 25 to 50 times and the channel length is about 50 to 100 times the average particle size of the carrier, for example, the channel width is 25 to 250 mm. The length and the channel length are preferably about 50 to 500 mm.

Similarly, the carrier return flow path 15, to the extent that the carrier does not interfere with the passage of the carrier is returned smoothly to the tank flow path width (the inner wall of the second vertical plate portion 21 c and the tank body 11 It is preferable that the length of the flow path is such that it is not affected by the convection of the liquid in the tank (does not flow backward). Specifically, the average channel width of the carrier return channel is preferably about 25 to 50 times and the channel length is about 50 to 100 times the average particle size of the carrier. For example, the channel width is 25 It is preferable that the flow path length is about 50 to 500 mm.

The angles θ ₁ and θ _{2 with} respect to the horizontal direction of the carrier drawing channel 14 and the carrier return channel 15 may be arbitrary angles of 45 ° to 90 °. The angle θ _{3 with} respect to the horizontal direction of the inclined portion 20b may be an arbitrary angle of 30 to 60 ° (however, θ ₁ and θ ₂ are larger than θ ₃ ).

  The carrier return flow path 15 may be provided with a return promotion means for ejecting water downward from the nozzle to form a water flow in the return direction (downward direction). The water to be ejected may be treated water of the treatment device or in-tank water.

  Since the carrier separation screen 12 is disposed so as to be immersed in water and there is no concern about corrosion, a wedge wire screen made of SUS can be used as the carrier separation screen 12. However, the upper part of the carrier separation screen 12 may be positioned above the water surface WL.

  In the present embodiment, the upper part of the carrier-containing water receiving chamber B is opened to communicate with the biological treatment chamber A, but the upper part of the carrier-containing water receiving chamber B may be closed. In this case, the upper part of the current plate 30 is extended to the upper end of the tank body so that the gas phase region of the biological treatment chamber A and the gas phase region of the carrier-containing water receiving chamber B are completely partitioned. Also good.

  In the present embodiment, the carrier separation screen is used as the treated water discharge part. However, a trough may be used under the condition that the floating of the carrier is sufficiently suppressed in the carrier-containing water receiving chamber B.

  When anaerobic biological treatment is performed using this treatment device, gas generated by biological treatment adheres to the carrier and floats in the biological treatment chamber, but most of the bubbles are separated from the carrier at the top of the biological treatment chamber, A part of the carrier that settles with the bubbles attached thereto is drawn into the carrier drawing channel, and further the bubbles are separated from the carrier and flow into the carrier-containing water receiving chamber while passing through the carrier drawing channel. At this time, almost no bubbles are attached to the carrier flowing into the carrier-containing water receiving chamber and the sedimentation speed is sufficiently high, so that the carrier does not flow out of the tank. Since it is isolated from the convection in the biological treatment chamber, the risk of the carrier clogging in the carrier separation screen located higher than the lower end of the carrier drawing channel is also reduced.

  In the anaerobic treatment apparatus 10 </ b> A of FIG. 2, rectifying plates 21 and 31 are installed instead of the rectifying plates 20 and 30. The rectifying plate 31 includes a vertical plate portion 31a having the same shape as that of the rectifying plate 30, and an inclined portion 31b that is connected to the lower end of the vertical plate portion 31a and extends substantially parallel to an inclined portion 21b of the rectifying plate 21 described later. Have. The rectifying plate 21 has a configuration in which the first vertical plate portion 20a is omitted from the rectifying plate 20, and has a configuration including an inclined portion 21b and a second vertical plate portion 21c. A region sandwiched between the inclined portion 21b and the inclined portion 31b is the carrier drawing channel 14.

  The other configuration of the anaerobic processing apparatus 10A is the same as that of the anaerobic processing apparatus 10, and the same reference numerals indicate the same parts.

  In the anaerobic treatment apparatus 10 </ b> B of FIG. 3, the screen 12 is disposed at the upper center of the tank body 11. Further, instead of the rectifying plates 20 and 30, rectifying plates 22 and 32 are installed. The rectifying plate 32 has a cylindrical shape (cylindrical shape or rectangular tube shape) surrounding the carrier-containing water receiving chamber B around the screen 12, and the cylindrical axis direction is the vertical direction. The upper part of the current plate 32 protrudes above the water surface WL, and the lower part is submerged in water.

  The rectifying plate 22 includes a first cylindrical portion 22a that surrounds the outer periphery of the lower portion of the rectifying plate 32, a tapered portion 22b that is continuous with the lower end of the first cylindrical portion 22a and is inclined so as to be lower toward the center side, and the tapered portion The second cylindrical portion 22c is connected to the lower end of the 22b and extends downward. The first cylindrical portion 22a is submerged in water as a whole, and the upper end thereof is also positioned below the water surface WL. A region sandwiched between the first cylindrical portion 22 a and the rectifying plate 32 is the carrier drawing channel 14. The inside of the second cylinder portion 22c is a carrier return channel 15.

  The other structure of this anaerobic processing apparatus 10B is the same as the anaerobic processing apparatus 10, and the same code | symbol has shown the identical part.

  The anaerobic treatment apparatus 10 </ b> C in FIG. 4 is provided with rectifying plates 23 and 33 instead of the rectifying plates 22 and 32. The rectifying plate 33 is connected to the cylindrical portion 33a having the same configuration as that of the rectifying plate 32, is connected to the lower end of the cylindrical portion 33a, has a downward slope toward the center side, and a tapered portion 23b of the rectifying plate 23 to be described later. It has the taper part 33b which is parallel. The rectifying plate 23 has a configuration in which the first cylindrical portion 22a is omitted from the rectifying plate 22, and includes a tapered portion 23b and a second cylindrical portion 23c. A region sandwiched between the taper portion 23 b and the taper portion 33 b of the rectifying plate 33 is the carrier drawing channel 14.

  Other configurations of the anaerobic processing apparatus 10C are the same as those of the anaerobic processing apparatus 10B, and the same reference numerals denote the same parts.

  The tank bodies 11 of the above-described anaerobic treatment apparatuses 10 to 10C are all cylindrical and do not have a portion projecting outward from the side, but may include a portion projecting partially outward from the side. Good.

  An example is shown in FIG. In the anaerobic treatment apparatus 10D of FIG. 5, an overhanging portion 17 that projects outward is provided in a part of the upper side of the tank body 11, and the inside of the overhanging portion 17 is the carrier-containing water receiving chamber B. It has become. A bottom surface 17t of the overhang portion 17 has a downward slope toward the biological treatment chamber A. A screen 12 is disposed in the carrier-containing water receiving chamber B.

  Rectifying plates 24 and 34 made of vertical plates are provided so as to partition the carrier-containing water receiving chamber B and the biological treatment chamber A, respectively. Both sides of the current plates 24 and 34 are connected to the tank body 11. The upper end of the rectifying plate 34 protrudes above the water surface WL. There is a gap between the lower end of the current plate 34 and the bottom surface 17t of the overhang portion 17. The rectifying plate 24 is located closer to the biological treatment chamber A than the rectifying plate 34. The rectifying plate 24 is located above the tank body side wall lower portion 11s on the overhanging portion 17 side. The upper end of the rectifying plate 24 is located above the lower end of the rectifying plate 34, and the space between the rectifying plates 24 and 34 is the carrier drawing channel 14. The lower end of the rectifying plate 24 is positioned lower than the lower end of the rectifying plate 34. Further, there is a gap between the lower end of the rectifying plate 24 and the bottom surface 17 t of the overhanging portion 17, and the carrier return channel 15 is formed between the two. The angle of the bottom surface 17t with respect to the horizontal direction may be an arbitrary angle of 45 to 60 °.

  Also in the anaerobic processing apparatuses 10A to 10C of FIGS. 2 to 4, the preferred values of the channel width and the channel length of the carrier drawing channel 14 and the carrier return channel 15 are the same as those of the anaerobic processing device 10 of FIG. . The preferred value of the channel length of the carrier drawing channel 14 of FIG. 5 is the same as that of the anaerobic treatment apparatus 10 of FIG. The same effect as the anaerobic processing apparatus 10 is obtained by the anaerobic processing apparatuses 10A to 10D in FIGS.

  Next, the fluid non-biological carrier used in the present invention will be described. In the following description, the sedimentation rate and size of the carrier represent the sedimentation rate and size of the carrier to which no microorganisms or bubbles are attached.

  The flowable non-biological carrier used in the present invention has a sedimentation speed of 200 to 500 m / hr. If the sedimentation rate of the carrier is too small, the carrier is likely to float due to water flow or generated gas. Conversely, if the sedimentation rate of the carrier is too large, the contact efficiency with the water to be treated is deteriorated, and sufficient treatment efficiency cannot be obtained, or Detrimental effects such as accumulation of solid matter in the deposited layer of the carrier and blockage of the flow path are likely to occur.

  Here, the settling speed of the carrier is taken out by immersing the carrier in water (fresh water such as tap water) and taking it out and putting it into a graduated cylinder in water (fresh water such as tap water). This is a value obtained by measuring the sedimentation distance per unit time. In the present invention, 10 to 20 carriers are measured, and the average value is defined as the sedimentation speed.

  On the other hand, if the size of the carrier is too large, the surface area per volume of the reaction vessel will be small. The carrier used in the present invention preferably has a size (average value) of 1.0 to 5.0 mm, particularly 2.5 to 4.0 mm.

  Here, the size of the carrier is usually referred to as “particle size”. For example, in the case of a rectangular parallelepiped carrier, it represents the length of the long side, and in the case of a cubic carrier, one side thereof. In the case of a cylindrical carrier, it represents the larger one of the diameter and the height of the cylinder. In the case of a carrier having an irregular shape other than these shapes, when the carrier is sandwiched between two parallel plates, it represents the interval between the plates where the interval between the plates is the largest.

  The carrier used in the present invention is not particularly limited as long as its sedimentation rate satisfies the above range, and the constituent material of the carrier is not particularly limited.

  In the present invention, the water to be treated may be any liquid containing an organic substance that can be treated by anaerobic treatment by contacting with anaerobic microorganisms, and the composition and concentration are not particularly limited.

The COD concentration of the water to be treated is not particularly limited, but as described above, the anaerobic treatment using a carrier is a low-concentration wastewater that is difficult to apply to treatment using granules such as the UASB method and the EGSB method. Since particularly excellent effects are exhibited in the treatment, the water to be treated in the present invention is effective for the treatment of low-concentration wastewater having a COD _Cr concentration of 2000 mg / L or less, for example, 500 to 2000 mg / L. Such wastewater includes, but is not limited to, manufacturing wastewater from food factories, organic wastewater from chemical factories, general sewage, and the like.

DESCRIPTION OF SYMBOLS 1 Acid production tank 2 pH adjustment tank 3 Reaction tank 4 Flowable non-biological support | carrier 5 Bubble separation piping 6 Treated water tank 10,10A-10D Anaerobic processing apparatus 11 Tank body 12 Screen 13 Treated water extraction pipe 14 Carrier drawing-in flow path 15 Carrier Return flow path 20-24, 30-34 Rectifier plate

Claims (4)

In an anaerobic treatment apparatus for treating water to be treated by passing water to be treated in an anaerobic condition in a tank filled with a fluid non-biological carrier, forming a biofilm on the surface of the non-biological carrier,
A pair of rectifying plates, a biological treatment chamber, and a carrier-containing water receiving chamber having a treated water extraction part are disposed in the tank, and the pair of rectifying plates are arranged between the two. Are arranged at intervals so that
The carrier has a sedimentation rate of 200 to 500 m / hr;
Cistern inside, as adjacent sides of the current plate of the pair, partition and said biological treatment chamber which carrier to flow in the said carrier containing water receiving chamber is isolated from convection of the organism processing chamber Has been
The carrier draw-in channel has an inclination, the upper end side of the carrier draw-in channel is connected to the biological treatment chamber, and the lower end side is arranged to be connected to the carrier-containing water receiving chamber,
The carrier inlet channel has a channel width (interval between rectifying plates) of 20 to 50 times the average particle size of the carrier , 25 to 250 mm , and the carrier inlet channel has a channel length of 50 to 500 mm. And
An anaerobic treatment apparatus, wherein a part of the carrier-containing water in the biological treatment chamber passes through the carrier drawing channel from the upper side to the lower side and flows into the carrier-containing water receiving chamber. . According to claim 1, anaerobic treatment and wherein the pre-flow path length of Ki担 body pull channel is 50 to 100 times the average particle size of the carrier.   3. The anaerobic treatment apparatus according to claim 1, further comprising a carrier return channel that returns the carrier settled in the carrier-containing water receiving chamber to the biological treatment chamber.   The anaerobic processing method of processing organic wastewater using the anaerobic processing apparatus of any one of Claim 1 thru | or 3.

Images