JP2020025901A - Anaerobic fluid bed type biological treatment apparatus and anaerobic fluid bed type biological treatment method - Google Patents
Anaerobic fluid bed type biological treatment apparatus and anaerobic fluid bed type biological treatment method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
Description
本発明は、微生物を付着した担体を用いた嫌気性流動床式生物処理装置および嫌気性流動床式生物処理方法に関する。 The present invention relates to an anaerobic fluidized-bed biological treatment apparatus and an anaerobic fluidized-bed biological treatment method using a carrier having microorganisms attached thereto.
流動床式の嫌気性生物処理は、担体に微生物を固着させ、流動により被処理水との接触効率を高めることで、安定かつ高効率な処理が実現出来る処理方法である。しかし、担体の流動状態を適切に管理しなければ、担体に付着した微生物の剥離や、担体の反応槽外への流出等が発生し、処理が不安定となる。 The anaerobic biological treatment of a fluidized bed type is a treatment method capable of realizing a stable and highly efficient treatment by fixing microorganisms to a carrier and increasing the contact efficiency with water to be treated by flowing. However, if the flow state of the carrier is not properly controlled, the microorganisms adhering to the carrier may be peeled off, the carrier may flow out of the reaction tank, and the treatment may be unstable.
特許文献１には、反応槽内に上下が開口したドラフトチューブを設け、ドラフトチューブの内側に下向流、ドラフトチューブの外側に上向流を形成し、上向流に伴って上昇する担体が存在する領域を実質的にドラフトチューブの上端以下に抑える方法が示されている。微生物の付着した担体は、微生物の付着量や担体内で発生するバイオガス量等によって担体の見掛けの比重が変化するため、特許文献１の方法では、担体の流動性を十分に確保しながら担体の存在領域をドラフトチューブの上端以下に制御するには、界面計測装置を設置して管理する等、装置構成、運転管理が複雑になる場合がある。 Patent Document 1 discloses that a draft tube having an open top and bottom is provided in a reaction tank, a downward flow is formed inside the draft tube, an upward flow is formed outside the draft tube, and a carrier that rises with the upward flow is provided. A method is shown in which the existing area is substantially kept below the upper end of the draft tube. Since the apparent specific gravity of a carrier varies depending on the amount of microorganisms attached thereto and the amount of biogas generated in the carrier, the method of Patent Document 1 requires the carrier with sufficient fluidity of the carrier. In order to control the existence region of the lower part of the draft tube to be lower than the upper end thereof, the device configuration and operation management may be complicated, for example, by installing and managing an interface measuring device.
特許文献２には、槽底部に放射状に延びる静翼と槽内の液面下方付近に回転翼を具備する反応槽において、回転翼より下方位置の槽側壁面に開口部を設けるとともに、その槽壁面の外部に開口部に連通する担体分離部を設ける方法が示されている。特許文献２の方法では、担体分離部は背面板や前面板を複雑に組み合わせる必要があり、かつ反応槽と担体分離部との接続部分が液面下となっているため、排水処理に伴って発生するスカムや油分が液面上に蓄積する問題がある。 Patent Literature 2 discloses that in a reaction tank having a stationary blade extending radially at the bottom of a tank and a rotary blade near a lower portion of the liquid level in the tank, an opening is provided on a tank side wall surface located below the rotary blade, and the tank is provided. A method of providing a carrier separating portion communicating with the opening outside the wall surface is shown. In the method of Patent Literature 2, the carrier separation unit requires a complicated combination of a back plate and a front plate, and the connection between the reaction tank and the carrier separation unit is below the liquid level. There is a problem that generated scum and oil accumulate on the liquid surface.
本発明の目的は、担体を適切な流動状態に維持し、かつ反応槽内におけるスカム等の液面浮遊物の蓄積を抑制しながら反応槽外への担体の流出を抑制し、安定した高効率の嫌気性処理が可能となる、嫌気性流動床式生物処理装置および嫌気性流動床式生物処理方法を提供することにある。 An object of the present invention is to maintain the carrier in an appropriate flow state, and to suppress the outflow of the carrier out of the reaction tank while suppressing accumulation of liquid surface suspended matter such as scum in the reaction tank, thereby achieving stable high efficiency. An object of the present invention is to provide an anaerobic fluidized-bed biological treatment apparatus and an anaerobic fluidized-bed biological treatment method that enable anaerobic treatment of anaerobic fluid.
本発明は、担体を用いた流動床式の生物処理を行うための反応槽と、前記反応槽に液体を導入したときの液面から所定の深さに設置された回転翼と、前記反応槽の底部に固定された放射状に延びる静翼と、前記反応槽における液面付近に設置された、前記反応槽内の液体を外部に排出する排出口と、を備える、嫌気性流動床式生物処理装置である。 The present invention relates to a reaction tank for performing a fluidized bed biological treatment using a carrier, a rotating blade installed at a predetermined depth from a liquid level when a liquid is introduced into the reaction tank, and the reaction tank An anaerobic fluidized bed biological treatment, comprising: a radially extending stationary blade fixed to the bottom of the reactor; and an outlet installed near the liquid level in the reactor, for discharging the liquid in the reactor to the outside. Device.
前記嫌気性流動床式生物処理装置において、前記回転翼は、前記回転翼の上方で前記回転翼の回転の影響を受けない液層部分が形成される深さに設置されることが好ましい。 In the anaerobic fluidized-bed biological treatment apparatus, it is preferable that the rotor is installed at a depth above the rotor which forms a liquid layer portion that is not affected by rotation of the rotor.
前記嫌気性流動床式生物処理装置において、前記回転翼は、前記液面からの深さの１／４よりも前記反応槽の底部側に設置されることが好ましい。 In the anaerobic fluidized-bed biological treatment apparatus, it is preferable that the rotary blade is provided on a bottom side of the reaction tank with respect to a quarter of a depth from the liquid level.
前記嫌気性流動床式生物処理装置において、前記回転翼は、長方形状の平板であることが好ましい。 In the anaerobic fluidized-bed biological treatment device, the rotor is preferably a rectangular flat plate.
前記嫌気性流動床式生物処理装置において、前記回転翼の上端部に板体が固定されていることが好ましい。 In the anaerobic fluidized-bed biological treatment device, it is preferable that a plate is fixed to an upper end portion of the rotor.
前記嫌気性流動床式生物処理装置において、前記液面より下で、前記回転翼の上方の前記反応槽の側壁の内周面に、円周方向に、邪魔板が固定されていることが好ましい。 In the anaerobic fluidized-bed biological treatment apparatus, it is preferable that a baffle plate is fixed in a circumferential direction to an inner peripheral surface of a side wall of the reaction tank above the rotary blade and below the liquid surface. .
また、本発明は、担体を用いた流動床式の生物処理を行うための反応槽と、前記反応槽に液体を導入したときの液面から所定の深さに設置された回転翼と、前記反応槽の底部に固定された放射状に延びる静翼と、前記反応槽における液面付近に設置された、前記反応槽内の液体を外部に排出する排出口と、を備える生物処理装置を用いて嫌気性流動床式生物処理を行う、嫌気性流動床式生物処理方法である。 Further, the present invention also provides a reaction vessel for performing a fluidized bed biological treatment using a carrier, and a rotary blade installed at a predetermined depth from a liquid level when a liquid is introduced into the reaction vessel; Using a biological treatment apparatus including a radially extending stationary blade fixed to the bottom of the reaction tank, and a discharge port disposed near the liquid level in the reaction tank and discharging the liquid in the reaction tank to the outside, This is an anaerobic fluidized bed biological treatment method in which an anaerobic fluidized bed biological treatment is performed.
前記嫌気性流動床式生物処理方法において、前記回転翼は、前記回転翼の上方で前記回転翼の回転の影響を受けない液層部分が形成される深さに設置されることが好ましい。 In the anaerobic fluidized-bed biological treatment method, it is preferable that the rotor is installed at a depth above the rotor which forms a liquid layer portion that is not affected by rotation of the rotor.
前記嫌気性流動床式生物処理方法において、前記回転翼は、前記液面からの深さの１／４よりも前記反応槽の底部側に設置されることが好ましい。 In the anaerobic fluidized-bed biological treatment method, it is preferable that the rotor is installed on a bottom side of the reaction tank with a depth of １ ／ of a depth from the liquid level.
前記嫌気性流動床式生物処理方法において、前記回転翼は、長方形状の平板であることが好ましい。 In the anaerobic fluidized bed biological treatment method, the rotor is preferably a rectangular flat plate.
前記嫌気性流動床式生物処理方法において、前記回転翼の上端部に板体が固定されていることが好ましい。 In the anaerobic fluidized-bed biological treatment method, it is preferable that a plate is fixed to an upper end of the rotor.
前記嫌気性流動床式生物処理方法において、前記液面より下で、前記回転翼の上方の前記反応槽の側壁の内周面に、円周方向に、邪魔板が固定されていることが好ましい。 In the anaerobic fluidized bed biological treatment method, it is preferable that a baffle plate is fixed in a circumferential direction to an inner peripheral surface of a side wall of the reaction tank below the liquid surface and above the rotary blade. .
本発明により、担体を適切な流動状態に維持し、かつ反応槽内におけるスカム等の液面浮遊物の蓄積を抑制しながら反応槽外への担体の流出を抑制し、安定した高効率の嫌気性処理が可能となる。 According to the present invention, the carrier is maintained in an appropriate fluidized state, and the carrier is prevented from flowing out of the reaction tank while suppressing accumulation of liquid surface floating substances such as scum in the reaction tank, thereby achieving stable and efficient anaerobic. Sexual processing becomes possible.
本発明の実施の形態について以下説明する。本実施形態は本発明を実施する一例であって、本発明は本実施形態に限定されるものではない。 An embodiment of the present invention will be described below. The present embodiment is an example for implementing the present invention, and the present invention is not limited to the present embodiment.
本発明の実施形態に係る生物処理装置の第１の概略を図１に示し、その構成について説明する。 FIG. 1 shows a first outline of a biological treatment apparatus according to an embodiment of the present invention, and its configuration will be described.
［嫌気性流動床式生物処理の反応槽、撹拌装置］
生物処理装置８は、担体を用いた流動床式の生物処理を行うための反応槽２と、反応槽２に液体を導入したときの液面から所定の深さに設置された回転翼３と、反応槽２の底部に固定された放射状に延びる静翼４と、反応槽２における液面付近に設置された、反応槽２内の液体を外部に排出する排出口９と、を備える。生物処理装置８は、反応槽２の例えば底部付近の側壁部分に形成された、反応槽２内に被処理水を導入する流入管６を備える。反応槽２内には、嫌気性微生物が生物膜状となって付着している担体１３が投入されている。
[Anaerobic fluidized bed biological treatment tank and stirrer]
The biological treatment device 8 includes a reaction tank 2 for performing a fluidized bed biological treatment using a carrier, and a rotating blade 3 installed at a predetermined depth from a liquid level when a liquid is introduced into the reaction tank 2. A radially extending stationary blade 4 fixed to the bottom of the reaction tank 2, and a discharge port 9 installed near the liquid level in the reaction tank 2 for discharging the liquid in the reaction tank 2 to the outside. The biological treatment device 8 includes an inflow pipe 6 formed in, for example, a side wall near the bottom of the reaction tank 2 to introduce water to be treated into the reaction tank 2. In the reaction tank 2, a carrier 13 to which anaerobic microorganisms are attached in the form of a biofilm is charged.
本実施形態に係る生物処理装置８においては、撹拌装置の回転軸３ａを反応槽２内の液面から下方に伸ばし、回転軸３ａの下端に固定された回転翼３を、反応槽２内に収容された被処理水の液面から所定の深さにおいて回転するように設けるとともに、回転翼３の上方の液面付近における反応槽２の側壁に排出口９を設ける。 In the biological treatment device 8 according to the present embodiment, the rotating shaft 3a of the stirring device is extended downward from the liquid level in the reaction tank 2, and the rotating blade 3 fixed to the lower end of the rotating shaft 3a is inserted into the reaction tank 2. A water outlet is provided on the side wall of the reaction tank 2 near the liquid surface above the rotating blades 3 while being provided so as to rotate at a predetermined depth from the liquid surface of the accommodated water to be treated.
なお、「液面から所定の深さ」とは、反応槽２内に予め定めた（規定）の高さまで被処理水を収容し、回転翼３を回転させたときに、回転翼３の上方で、回転翼３の回転の影響を実質的に受けない液層部分１０（以下、「無担体ゾーン１０」という）が形成される深さを意味し、この深さは、反応槽２と回転翼３と静翼４の形状や、回転翼３の回転数や、被処理水や担体１３の種類等により影響を受けるが、例えば、回転翼３は、液面からの深さの１／４よりも反応槽２の底部側に設置されることが好ましく、液面からの深さの１／３．７以下の反応槽２の底部側に設置されることがより好ましく、液面からの深さの１／３よりも反応槽２の底部側に設置されることがさらに好ましい。 In addition, the “predetermined depth from the liquid level” refers to the case where the water to be treated is stored in the reaction tank 2 to a predetermined (prescribed) height and the rotating blade 3 is rotated. Means the depth at which the liquid layer portion 10 (hereinafter, referred to as “carrier-free zone 10”) that is not substantially affected by the rotation of the rotary blade 3 is formed. The shape is influenced by the shapes of the blades 3 and the stationary blades 4, the number of rotations of the rotary blade 3, the type of water to be treated and the type of the carrier 13, and the like. It is more preferably installed on the bottom side of the reaction tank 2 than on the bottom side of the reaction tank 2, more preferably 1 / 3.7 or less of the depth from the liquid level. More preferably, it is installed on the bottom side of the reaction tank 2 than 1/3 of the thickness.
排出口９は、回転翼３の上方の無担体ゾーン１０の上部の液面付近における反応槽２の側壁部分に設置される。この「排出口を液面付近に設置」とは、液面に蓄積し易いスカムや油分等を系外へ排出することができるように設置すればよく、例えば反応槽２の水位（底部２ａから液面までの高さ）の上部５%以内に排出口の中心がくるよう設置すればよい。 The discharge port 9 is provided on the side wall of the reaction tank 2 near the liquid level above the carrier-free zone 10 above the rotary blade 3. The term "installing the discharge port near the liquid surface" means that the scum or oil, which easily accumulates on the liquid surface, may be installed so as to be discharged out of the system. For example, the water level of the reaction tank 2 (from the bottom 2a) The height of the outlet should be within 5% of the upper part of the liquid level).
本実施形態に係る生物処理方法および生物処理装置８の動作について説明する。 The operation of the biological treatment method and the biological treatment device 8 according to the present embodiment will be described.
被処理水は、流入管６より、反応槽２内に所定の高さまで導入されて、反応槽２内に収容される。回転翼３が回転されることにより、反応槽２内において、担体１３および被処理水は、例えば図１に示すように、回転翼３によって反応槽２の半径方向外側に吐出されて反応槽２の側壁内面に接して下方に流れて、反応槽２の側壁内面を旋回しながら緩やかに反応槽２の底部２ａに向かう下降流が形成され、その後、反応槽２の底部２ａの中心部において、静翼４により、竜巻上昇流が引き起こされ、これにより、回転翼３と静翼４との間において、循環流が形成され、反応槽２内で担体１３および被処理水の混合、分散化が行われる。 The water to be treated is introduced into the reaction tank 2 to a predetermined height from the inflow pipe 6 and stored in the reaction tank 2. When the rotor 3 is rotated, the carrier 13 and the water to be treated are discharged to the outside of the reaction tank 2 in the radial direction by the rotor 3, for example, as shown in FIG. Flows downward in contact with the inner surface of the side wall of the reaction vessel 2 and gradually descends toward the bottom 2a of the reaction vessel 2 while rotating around the inner surface of the side wall of the reaction vessel 2. Thereafter, at the center of the bottom 2a of the reaction vessel 2, A tornado rising flow is caused by the stationary blade 4, whereby a circulating flow is formed between the rotary blade 3 and the stationary blade 4, and mixing and dispersion of the carrier 13 and the water to be treated are performed in the reaction tank 2. Done.
回転翼３の上方に回転翼３による吐出流の影響をほとんど受けない無担体ゾーン１０が形成され、無担体ゾーン１０の処理水が、液面付近の排出口９から排出される。これにより、反応後の処理水が、担体１３の流出がほとんどない状態で、処理槽２の外に引き抜き排出される。 A carrier-free zone 10 hardly affected by the discharge flow of the rotor 3 is formed above the rotor 3, and the treated water in the carrier-free zone 10 is discharged from a discharge port 9 near the liquid surface. As a result, the treated water after the reaction is pulled out of the treatment tank 2 and discharged with almost no outflow of the carrier 13.
本実施形態に係る生物処理方法および生物処理装置により、担体１３を適切な流動状態に維持し、かつ反応槽２内におけるスカム等の液面浮遊物の蓄積を抑制しながら反応槽２外への担体１３の流出を抑制し、安定した高効率の嫌気性処理が可能となる。簡易な構成で、担体１３の槽内混合、分散化が得られるとともに、担体１３が生物処理系から系外に流出することが抑制される。 With the biological treatment method and biological treatment device according to the present embodiment, the carrier 13 is maintained in an appropriate fluidized state, and while the accumulation of liquid surface floating substances such as scum in the reaction tank 2 is suppressed, the carrier 13 flows out of the reaction tank 2. Outflow of the carrier 13 is suppressed, and stable and efficient anaerobic treatment can be performed. With a simple configuration, mixing and dispersion of the carrier 13 in the tank can be obtained, and the carrier 13 is prevented from flowing out of the biological treatment system to the outside.
回転翼３の形状としては、反応槽２内の液体を撹拌できるものであればよく、特に制限はないが、例えば、パドル翼、傾斜パドル翼、プロペラ翼、タービン翼、アンカー翼等が挙げられる。回転翼３の形状は、図１に縦断側面図、および、図２に図１におけるＡ−Ａ線断面図を示すように、長方形状（正方形状を含む）の平板（フラット状パドル）、すなわちパドル翼が好ましい。図１，２の例では、回転翼３は、傾斜角度９０度の長方形状の平板（フラット状パドル）の羽根４枚が等角度で配置されている４枚パドル翼である。この長方形状の平板の回転翼３によって、担体１３に付着した微生物の剥離が抑制される。パドル翼の羽根の枚数は、例えば、２〜６枚とすればよい。 The shape of the rotary blade 3 is not particularly limited as long as the liquid in the reaction tank 2 can be stirred, and examples thereof include a paddle blade, an inclined paddle blade, a propeller blade, a turbine blade, and an anchor blade. . The shape of the rotary wing 3 is a rectangular (including square) flat plate (flat paddle), that is, as shown in a longitudinal side view in FIG. 1 and a sectional view taken along the line AA in FIG. 1 in FIG. Paddle wings are preferred. In the example of FIGS. 1 and 2, the rotary blade 3 is a four-paddle blade in which four rectangular flat plate (flat paddle) blades having an inclination angle of 90 degrees are arranged at equal angles. The removal of microorganisms attached to the carrier 13 is suppressed by the rectangular flat rotor 3. The number of blades of the paddle blade may be, for example, two to six.
反応槽２の内径に対する、回転翼３の反応槽２の径方向の長さ（翼径）の比は、例えば、０．２５〜０．６の範囲とすればよい。回転翼３の高さは、例えば、回転翼径に対して０．１５〜０．３５の範囲とすればよい。 The ratio of the radial length (blade diameter) of the rotary blade 3 of the reaction vessel 2 to the inner diameter of the reaction vessel 2 may be, for example, in the range of 0.25 to 0.6. The height of the rotor 3 may be, for example, in the range of 0.15 to 0.35 with respect to the rotor diameter.
静翼４の形状は、反応槽２の底部の中心部から放射状に延びる長方形状（正方形状を含む）の平板（フラット状板）である。図１，２の例では、傾斜角度９０度の長方形状の平板（フラット状板）４枚が等角度で配置されている。羽根の枚数は、例えば、２〜６枚とすればよい。 The shape of the stationary blade 4 is a rectangular (including square) flat plate (flat plate) extending radially from the center of the bottom of the reaction tank 2. In the example of FIGS. 1 and 2, four rectangular flat plates (flat plates) having a tilt angle of 90 degrees are arranged at equal angles. The number of blades may be, for example, 2 to 6 blades.
反応槽２の内径に対する、静翼４の反応槽２の径方向の長さ（静翼径）の比は、例えば、０．６〜１．０の範囲とすればよい。静翼４の高さは、例えば、回転翼径に対して０．１５〜０．３５の範囲とすればよい。 The ratio of the length of the stationary blade 4 in the radial direction of the reaction tank 2 (diameter of the stationary blade) to the inner diameter of the reaction tank 2 may be, for example, in the range of 0.6 to 1.0. The height of the stationary blade 4 may be, for example, in the range of 0.15 to 0.35 with respect to the diameter of the rotating blade.
図３，４に、本実施形態に係る生物処理装置の第２の例の概略構成を示す。図５には、図４におけるＢ−Ｂ線断面図を示す。図３〜５の生物処理装置８では、回転翼３の上端部に円板等の板体１１が固定されている。 3 and 4 show a schematic configuration of a second example of the biological treatment apparatus according to the present embodiment. FIG. 5 is a sectional view taken along line BB in FIG. In the biological treatment device 8 of FIGS. 3 to 5, a plate 11 such as a disk is fixed to the upper end of the rotor 3.
板体１１は、例えば、その中心が回転軸３ａとほぼ一致した円板であり、回転翼３の径と同じ、それ以下の径、または、それ以上の径の円板で形成されるとともに、板体１１の縁部と反応槽２の側壁内面との間に隙間が形成されるような大きさに形成される。 The plate body 11 is, for example, a disk whose center substantially coincides with the rotation axis 3a, and is formed of a disk having a diameter equal to, less than, or greater than the diameter of the rotary wing 3; It is formed in such a size that a gap is formed between the edge of the plate 11 and the inner surface of the side wall of the reaction tank 2.
板体１１により、回転翼３の上方の無担体ゾーン１０への担体１３の侵入を図１の装置に比べてより少なくすることができるようになる。また、板体１１を設けることにより、回転翼３の上方に無担体ゾーン１０が形成されやすくなるため、図１のように板体１１を設置しない場合に比べて、回転翼３の位置をより高い位置に設けることができるようになる。すなわち、回転軸３ａの長さをより短くすることができる。 The plate 11 makes it possible to reduce the penetration of the carrier 13 into the carrier-free zone 10 above the rotor 3 compared to the device of FIG. In addition, since the provision of the plate 11 makes it easier to form the carrier-free zone 10 above the rotor 3, the position of the rotor 3 can be more increased than when the plate 11 is not installed as shown in FIG. 1. It can be provided at a higher position. That is, the length of the rotating shaft 3a can be further reduced.
板体１１は、円板の他に、例えば、リング状板、正方形板であってもよい。流動安定性、翼設計等の点から、円板が好ましい。 The plate body 11 may be, for example, a ring-shaped plate or a square plate in addition to the circular plate. Disks are preferred from the viewpoints of flow stability, blade design, and the like.
反応槽２の内径に対する、板体１１の長さの比は、例えば、０．２５〜０．６の範囲とすればよい。 The ratio of the length of the plate 11 to the inner diameter of the reaction tank 2 may be, for example, in the range of 0.25 to 0.6.
図６，７に、本実施形態に係る生物処理装置の第３の例の概略構成を示す。図８には、図７におけるＣ−Ｃ線断面図を示す。図６〜８の生物処理装置８では、回転翼３の上方でかつ液面よりも下方の反応槽２の側壁の内周面に、円周方向に、例えば、リング状板等の邪魔板１２が固定されている。 6 and 7 show a schematic configuration of a third example of the biological treatment apparatus according to the present embodiment. FIG. 8 is a cross-sectional view taken along line CC in FIG. In the biological treatment apparatus 8 shown in FIGS. 6 to 8, for example, a baffle plate 12 such as a ring-shaped plate is provided on the inner peripheral surface of the side wall of the reaction tank 2 above the rotor 3 and below the liquid surface. Has been fixed.
邪魔板１２は、反応槽２の側壁の内周面に、円周方向に固定されており、回転翼３の上方が開放されているものであればよく、特に制限はない。邪魔板１２は、例えば、反応槽２の内径と同じ外径のリング状の板が反応槽２の側壁内の全周にわたって水平に固定された板体であるリング状板であり、板体の中心部には、例えば、円状の開口部１２ａが形成されている。 The baffle plate 12 is fixed to the inner peripheral surface of the side wall of the reaction tank 2 in the circumferential direction, and is not particularly limited as long as it is open above the rotor 3. The baffle plate 12 is, for example, a ring-shaped plate in which a ring-shaped plate having the same outer diameter as the inner diameter of the reaction tank 2 is fixed horizontally over the entire circumference in the side wall of the reaction tank 2. At the center, for example, a circular opening 12a is formed.
邪魔板１２は、例えば、リング状板であり、リング状の平板の他に、リング状の傾斜板、リング状の湾曲板であってもよい。製作、施工等の点から、リング状の平板が好ましい。 The baffle plate 12 is, for example, a ring-shaped plate, and may be a ring-shaped inclined plate or a ring-shaped curved plate other than the ring-shaped flat plate. A ring-shaped flat plate is preferable in terms of production, construction, and the like.
邪魔板１２の設置位置は、回転翼３の上方でかつ液面よりも下方であればよいが、例えば、液面からの深さは回転翼径の１／２よりも反応槽２の液面側に設置されることがより好ましい。 The installation position of the baffle plate 12 may be above the rotary blade 3 and below the liquid surface. For example, the depth from the liquid surface is less than half the diameter of the rotary blade, More preferably, it is installed on the side.
邪魔板１２の開口部１２ａの大きさは、例えば、回転翼３の径よりも大きく形成すればよい。また、回転翼３の上端に板体１１が設置されている場合は、例えば、板体１１の径よりも大きく形成すればよい。 The size of the opening 12a of the baffle plate 12 may be larger than the diameter of the rotary wing 3, for example. When the plate 11 is provided at the upper end of the rotary wing 3, for example, the plate 11 may be formed larger than the diameter of the plate 11.
リング状板等の邪魔板１２により、図７に示すように、回転翼３により半径方向外側に吐出され、反応槽２の側壁の内面に接した被処理水が、邪魔板１２より上方に向かうのを抑制することができ、図１，４の装置に比べて回転翼３の上方の無担体ゾーン１０への担体１３の侵入をさらに少なくすることができるようになる。また、リング状板等の邪魔板１２を設けることにより、回転翼３の上方に無担体ゾーン１０がさらに形成されやすくなるため、図１，４のようにリング状板等の邪魔板１２を設置しない場合に比べて、回転翼３の位置をより高い位置に設けることができるようになる。すなわち、回転軸３ａの長さをより短くすることができる。 As shown in FIG. 7, as shown in FIG. 7, the water to be treated, which is discharged radially outward by the rotating blades 3 and is in contact with the inner surface of the side wall of the reaction tank 2, goes upward from the baffle plate 12. 1 and 4, the intrusion of the carrier 13 into the carrier-free zone 10 above the rotor 3 can be further reduced. Further, by providing the baffle plate 12 such as a ring-shaped plate, the carrier-free zone 10 is more easily formed above the rotary wing 3. Therefore, the baffle plate 12 such as a ring-shaped plate is installed as shown in FIGS. The position of the rotary wings 3 can be provided at a higher position than in a case where the rotating blade 3 is not provided. That is, the length of the rotating shaft 3a can be further reduced.
［担体］
担体としては、従来、嫌気性生物処理で使用される担体であれば特に制限されるものではなく、例えば、プラスチック製担体、スポンジ状担体、ゲル状担体等が挙げられる。特に、ゲル状担体を用いることで、高分子ポリマを産出しないメタン発酵菌がゲル状担体の３次元の網目構造の孔に入り込む、またはゲル状担体の形状、荷電等の関係で付着しやすく、また、撹拌による担体の流動性も高いため、プラスチック製担体、スポンジ状担体と比較して、高負荷処理が可能となる。ゲル状担体としては、特に限定されるものではないが、ポリビニルアルコール、ポリエチレングリコール、ポリウレタン等を含んでなる吸水性高分子ゲル状担体等が挙げられる。
[Carrier]
The carrier is not particularly limited as long as it is a carrier conventionally used in anaerobic biological treatment, and examples thereof include a plastic carrier, a sponge-like carrier, and a gel-like carrier. In particular, by using a gel carrier, methane fermentation bacteria that do not produce a high-molecular polymer easily enter the pores of the three-dimensional network structure of the gel carrier, or easily adhere due to the shape of the gel carrier, charge, etc. In addition, since the fluidity of the carrier due to stirring is high, high-load processing can be performed as compared with plastic carriers and sponge-like carriers. The gel-like carrier is not particularly limited, and examples thereof include a water-absorbing polymer gel-like carrier containing polyvinyl alcohol, polyethylene glycol, polyurethane and the like.
担体の形状は、特に限定されるものではないが、０．５ｍｍ〜２０ｍｍ程度の径の球状または立方体状（キューブ状）、長方体、円筒状等のものが好ましい。特に、３〜８ｍｍ程度の径の球状、または円筒状のゲル状担体が好ましい。 The shape of the carrier is not particularly limited, but is preferably spherical, cubic (cube), rectangular, cylindrical, or the like having a diameter of about 0.5 mm to 20 mm. Particularly, a spherical or cylindrical gel carrier having a diameter of about 3 to 8 mm is preferable.
反応槽２の内部に流動状態を形成するために、担体の比重は少なくとも１．０より大きく、真比重として、１．１以上、あるいは見かけ比重として１．０１以上のものが好ましい。 In order to form a fluid state inside the reaction vessel 2, the specific gravity of the carrier is preferably at least greater than 1.0, and the true specific gravity is preferably 1.1 or more, or the apparent specific gravity is preferably 1.01 or more.
反応槽２への担体の投入量は、反応槽２の容積に対して１０〜７０%の範囲が好ましい。担体の投入量が反応槽２の容積に対して１０%未満であると反応速度が小さくなる場合があり、７０%を超えると担体が流動しにくくなり、長期運転において汚泥による閉塞等で被処理水がショートパスして処理水質が悪くなる場合がある。 The amount of the carrier charged into the reaction tank 2 is preferably in the range of 10 to 70% based on the volume of the reaction tank 2. If the input amount of the carrier is less than 10% with respect to the volume of the reaction tank 2, the reaction rate may be reduced, and if it exceeds 70%, the carrier becomes difficult to flow, and is subject to treatment due to blockage by sludge in a long-term operation. Water may be short-passed and the quality of treated water may deteriorate.
担体の沈降速度は、１００〜１５０ｍ／ｈｒであることが好ましい。担体の沈降速度が１０ｍ／ｈｒ未満であると、担体が浮上し、反応槽２から流出しやすくなり、１５０ｍ／ｈｒを超えると、流動状態が悪くなり、被処理水がショートパスしたり、撹拌のエネルギーが大きくなったりする場合がある。 The sedimentation velocity of the carrier is preferably from 100 to 150 m / hr. If the sedimentation velocity of the carrier is less than 10 m / hr, the carrier floats up and easily flows out of the reaction tank 2. If the sedimentation velocity exceeds 150 m / hr, the flow state deteriorates, and the water to be treated is short-passed or stirred. Energy may increase.
［嫌気性微生物付着担体］
生物膜とは、嫌気性微生物と、嫌気性微生物が産出する菌体外多糖等の生産物等が集合した膜状構造体であって、少なくとも１０μｍ以上の膜厚、好ましくは２０μｍ以上の膜厚を有するものである。上記膜厚は、担体表面上からの厚みであり、１０個〜２０個の担体の平均値である。なお、菌体外多糖等の生産物は、アルカリを用いて生物膜から多糖類を抽出し、抽出液中の糖濃度をＡｎｔｈｒｏｎｅ法により測定することが可能である。菌体外多糖等の生産物は粘着性を有し、生物膜の付着性に影響を与えるものであると考えられ、例えば、生物膜中に２０ｐｐｍ以上存在していることが好ましく、５０ｐｐｍ以上存在していることがより好ましい。
[Anaerobic microorganism carrier]
The biofilm is a film-like structure in which anaerobic microorganisms and products such as exopolysaccharides produced by the anaerobic microorganisms are gathered, and has a film thickness of at least 10 μm or more, preferably 20 μm or more. It has. The film thickness is a thickness from the surface of the carrier, and is an average value of 10 to 20 carriers. For products such as extracellular polysaccharides, it is possible to extract polysaccharides from the biofilm using alkali and measure the sugar concentration in the extract by the Anthrone method. Products such as extracellular polysaccharides are considered to be sticky and affect the adhesion of the biofilm. For example, it is preferably present in the biofilm at 20 ppm or more, preferably at 50 ppm or more. Is more preferable.
［反応槽の運転条件］
本実施形態では、有機物を含有する有機性の被処理水を生物処理するにあたり、被処理水のｐＨは６．０〜８．５の範囲が好ましく、６．５〜７．５の範囲がより好ましい。被処理水のｐＨ調整は、例えば、ｐＨ調整剤供給ライン（図示せず）から、被処理水を貯留した被処理水槽（図示せず）にｐＨ調整剤を供給することにより行われる。被処理水のｐＨが上記範囲外であると、生物処理による有機物の分解反応速度が低下する場合がある。
[Operation conditions of reaction tank]
In the present embodiment, the pH of the water to be treated is preferably in the range of 6.0 to 8.5, and more preferably in the range of 6.5 to 7.5 when the organic water to be treated containing the organic matter is biologically treated. preferable. The pH of the water to be treated is adjusted, for example, by supplying a pH adjusting agent from a pH adjusting agent supply line (not shown) to a water tank (not shown) storing the water to be treated. If the pH of the water to be treated is outside the above range, the decomposition reaction rate of organic substances by biological treatment may decrease.
ｐＨ調整剤としては、塩酸等の酸剤、水酸化ナトリウム等のアルカリ剤等が挙げられ、特に制限されるものではない。また、ｐＨ調整剤は、例えば、緩衝作用を持つ重炭酸ナトリウム、燐酸緩衝液等であってもよい。 Examples of the pH adjuster include an acid agent such as hydrochloric acid and an alkali agent such as sodium hydroxide, and are not particularly limited. The pH adjuster may be, for example, sodium bicarbonate having a buffering action, a phosphate buffer, or the like.
本実施形態では、有機性の被処理水を生物処理するにあたり、嫌気性微生物の分解活性を良好に維持する等の点から、例えば、被処理水に栄養剤を添加することが好ましい。栄養剤としては、特に制限されるものではないが、例えば、炭素源、窒素源、燐源、その他無機塩類（ニッケル、コバルト、鉄等の塩類）等が挙げられる。 In the present embodiment, it is preferable to add a nutrient to the water to be treated, for example, from the viewpoint of maintaining the activity of decomposing the anaerobic microorganisms satisfactorily in the biological treatment of the water to be treated organically. The nutrient is not particularly limited, and examples thereof include a carbon source, a nitrogen source, a phosphorus source, and other inorganic salts (salts such as nickel, cobalt, and iron).
本実施形態では、流動床式の反応槽２の水温を２０℃以上となるように温度調整することが好ましい。通常、２０℃未満であると、分解反応速度が低下する傾向にある。流動床式の反応槽２内の水温の温度調整方法は、特に制限されるものではないが、例えば、流動床式の反応槽２にヒータ等の加熱装置を設置して、ヒータ等の熱により反応槽２内の水温を調整する方法等が挙げられる。 In the present embodiment, it is preferable to adjust the temperature of the fluidized bed type reaction tank 2 so that the water temperature is 20 ° C. or higher. Usually, when the temperature is lower than 20 ° C., the decomposition reaction rate tends to decrease. The method of adjusting the temperature of the water temperature in the fluidized bed type reaction vessel 2 is not particularly limited. For example, a heating device such as a heater is installed in the fluidized bed type reaction vessel 2 and the heat of the heater or the like is used. A method of adjusting the water temperature in the reaction tank 2 and the like can be given.
［被処理水］
本実施形態に係る生物処理装置および生物処理方法における処理対象である被処理水は、例えば、食品製造工場、電子産業工場、パルプ製造工場、化学工場等から排出される有機物（油脂、懸濁物質、ならびに油脂および懸濁物質以外の有機物）を含有する排水である。
[Treatment water]
The treated water to be treated in the biological treatment apparatus and the biological treatment method according to the present embodiment is, for example, an organic matter (oil, fat, suspended substance, or the like) discharged from a food manufacturing plant, an electronics industry plant, a pulp manufacturing plant, a chemical plant, or the like. , And organic matter other than oils and fats and suspended substances).
本実施形態に係る生物処理装置および生物処理方法は、被処理水のＣＯＤＣｒ濃度が比較的低く、流動担体ゾーン（無担体ゾーン１０の下方）から排出口９への液の流れ、すなわち上昇ＬＶ（ｍ／ｈ：被処理水流入量ｍ３／ｈを反応槽２の断面積で除した値）が高い条件ほど、高い効果を示す。例えば、被処理水ＣＯＤＣｒ濃度５０００ｍｇ／Ｌ以下、上昇ＬＶが２ｍ／ｈ以上の条件にて効果が高い。 The biological treatment apparatus and the biological treatment method according to this embodiment have a relatively low COD Cr concentration in the water to be treated, and the flow of the liquid from the fluid carrier zone (below the non-carrier zone 10) to the outlet 9, ie, the rising LV The higher the condition (m / h: the value obtained by dividing the inflow rate of the treated water m 3 / h by the cross-sectional area of the reaction tank 2), the higher the effect is. For example, the effect is high under the conditions where the COD Cr concentration of the water to be treated is 5000 mg / L or less and the rise LV is 2 m / h or more.
以下、実施例および比較例を挙げ、本発明をより具体的に詳細に説明するが、本発明は、以下の実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.
＜比較例１＞
試験は従来のドラフトチューブ型の嫌気性生物処理装置を用いて行った。排出口を液面付近に設置し、反応槽の容積は２．７Ｌとした。球状のポリビニルアルコール製ゲル状担体（細孔径４〜２０μｍ、直径４ｍｍ、比重１．０２５、沈降速度４ｃｍ／ｓｅｃ）を反応槽の容積に対して３０%投入し、嫌気性汚泥を反応構の容積に対して１０%投入した。プロペラ状の回転翼を用いて、撹拌速度２２０〜２６０ｒｐｍでドラフトチューブ内に下降流を発生させ、担体および嫌気性汚泥を流動させた。被処理水はスクロース、カツオエキスを主成分とした食品工場模擬排水（ＣＯＤＣｒ濃度１０００〜２０００ｍｇ／Ｌ）とした。
<Comparative Example 1>
The test was performed using a conventional draft tube type anaerobic biological treatment device. The discharge port was installed near the liquid surface, and the volume of the reaction tank was 2.7 L. A spherical polyvinyl alcohol gel-like carrier (pore diameter 4 to 20 μm, diameter 4 mm, specific gravity 1.025, sedimentation velocity 4 cm / sec) is charged at 30% of the volume of the reaction tank, and the anaerobic sludge is supplied to the volume of the reaction structure. 10% was added. A downflow was generated in the draft tube at a stirring speed of 220 to 260 rpm using a propeller-like rotating blade, and the carrier and the anaerobic sludge were caused to flow. The water to be treated was a food factory simulated wastewater (COD Cr concentration 1000 to 2000 mg / L) containing sucrose and skipjack extract as main components.
図９にＣＯＤＣｒ負荷、除去速度の経日変化、図１０に処理水の有機酸濃度の経日変化を示す。処理状況を確認しながら、段階的にＣＯＤＣｒ負荷を上昇させたが、ＣＯＤＣｒ負荷約３．３ｋｇ／ｍ３／ｄａｙにおいて処理水の有機酸濃度が２００ｍｇ／Ｌを超え、除去速度は２．４ｋｇ／ｍ３／ｄａｙ程度に留まった。 FIG. 9 shows the daily change of the COD Cr load and the removal rate, and FIG. 10 shows the daily change of the organic acid concentration of the treated water. While confirming the treatment status, the COD Cr load was increased stepwise, but at a COD Cr load of about 3.3 kg / m 3 / day, the organic acid concentration of the treated water exceeded 200 mg / L, and the removal rate was 2. It stayed at about 4 kg / m 3 / day.
これは、担体がドラフトチューブ内に進入することで、担体上の生物膜がプロペラ状の回転翼に接触し、剥離したことが要因の一つと考えられる。ドラフトチューブ内に担体が進入しないように撹拌速度を低下させた場合、一部の担体が反応槽の底部に蓄積する傾向を確認した。 This is considered to be one of the factors that the biofilm on the carrier came into contact with the propeller-shaped rotor and was peeled off when the carrier entered the draft tube. When the stirring speed was reduced so that the carrier did not enter the draft tube, it was confirmed that some carriers tended to accumulate at the bottom of the reaction tank.
＜実施例１＞
試験は図３，４に示す嫌気性生物処理装置を用いて行った。放射状に延びる静翼を槽底部、排出口を液面付近（反応槽の水位（底部から液面までの高さ）の上部５％以内）に設置し、反応槽の容積は１．３Ｌとした。球状のポリビニルアルコール製ゲル状担体（細孔径４〜２０μｍ、直径４ｍｍ、比重１．０２５、沈降速度４ｃｍ／ｓｅｃ）を反応槽の容積に対して３０%投入し、嫌気性汚泥を反応槽の容積に対して１０%投入した。フラット状の回転翼を用いて、撹拌速度８０〜９０ｒｐｍで反応槽壁付近に下降流の旋回流と反応槽中心付近に竜巻状の上昇流を発生させ、担体および嫌気性汚泥を流動させた。回転翼には上端部に円盤状の板（回転翼の径と同じ大きさ）を設置し、かつ回転翼は液面からの深さの１／３．７の位置に設置した。被処理水はスクロース、カツオエキスを主成分とした食品工場模擬排水（ＣＯＤＣｒ濃度３０００ｍｇ／Ｌ）とした。
<Example 1>
The test was performed using the anaerobic biological treatment apparatus shown in FIGS. The radially extending stationary blades were placed at the bottom of the tank, and the discharge port was placed near the liquid surface (within 5% of the upper part of the water level (height from the bottom to the liquid level) of the reaction tank). . A spherical polyvinyl alcohol gel-like carrier (pore diameter 4 to 20 μm, diameter 4 mm, specific gravity 1.025, sedimentation speed 4 cm / sec) is charged at 30% of the volume of the reaction tank, and anaerobic sludge is poured into the volume of the reaction tank. 10% was added. Using a flat rotor, a downflow swirling flow near the reaction vessel wall and a tornado-like upflow near the reaction vessel center were generated at a stirring speed of 80 to 90 rpm to flow the carrier and the anaerobic sludge. A disk-shaped plate (having the same size as the diameter of the rotor) was installed at the upper end of the rotor, and the rotor was installed at a position 1 / 3.7 of the depth from the liquid level. The water to be treated was food factory simulated wastewater (COD Cr concentration 3000 mg / L) containing sucrose and skipjack extract as main components.
図１１にＣＯＤＣｒ負荷、除去速度の経日変化、図１２に処理水の有機酸濃度の経日変化を示す。処理状況を確認しながら、段階的にＣＯＤＣｒ負荷を上昇させたところ、ＣＯＤＣｒ負荷約２１ｋｇ／ｍ３／ｄａｙにおいても処理水の有機酸濃度が２００ｍｇ／Ｌ以下を維持し、除去速度は１６ｋｇ／ｍ３／ｄａｙに到達した。フラット状回転翼と底部の静翼の効果により、担体上の微生物の剥離を抑えながら良好な担体流動状態を維持でき、かつ回転翼上端に円盤状板を設置し、回転翼の設置位置を液面からの深さの１／４より底部側とし、さらに排出口を液面付近に設置することで、担体の流出を抑制することができたため、処理効率を高くすることが可能であった。また、排出口からスカム等の液面浮遊物が排出されることで、ガス配管の目詰まり等が発生せず、安定した処理が可能であった。 FIG. 11 shows the daily change of COD Cr load and removal rate, and FIG. 12 shows the daily change of the organic acid concentration of the treated water. When the COD Cr load was increased stepwise while checking the treatment status, the organic acid concentration of the treated water was maintained at 200 mg / L or less even at a COD Cr load of about 21 kg / m 3 / day, and the removal rate was 16 kg. / M 3 / day. Due to the effect of the flat rotor and the stationary vane at the bottom, it is possible to maintain a good carrier flow state while suppressing the separation of microorganisms on the carrier, and install a disk-shaped plate on the upper end of the rotor to adjust the position of the rotor to liquid. By setting the bottom side from １ ／ of the depth from the surface and setting the discharge port near the liquid surface, the outflow of the carrier could be suppressed, so that the processing efficiency could be increased. In addition, since the liquid suspended matter such as scum was discharged from the discharge port, clogging of the gas pipe did not occur, and stable processing was possible.
このように、実施例の生物処理装置および生物処理方法によって、担体を適切な流動状態に維持し、かつ反応槽内におけるスカム等の液面浮遊物の蓄積を抑制しながら反応槽外への担体の流出を抑制し、安定した高効率の嫌気性処理が可能となった。 Thus, by the biological treatment apparatus and the biological treatment method of the embodiment, the carrier is maintained in an appropriate fluidized state, and the carrier is moved out of the reaction tank while suppressing accumulation of liquid surface suspended matter such as scum in the reaction tank. The effluent of water was suppressed, and stable and efficient anaerobic treatment became possible.
２ 反応槽、２ａ 底部、３ 回転翼、３ａ 回転軸、４ 静翼、６ 流入管、８ 生物処理装置、９ 排出口、１０ 無担体ゾーン、１１ 板体、１２ 邪魔板、１２ａ 開口部、１３ 担体。 2 reaction tank, 2a bottom, 3 rotating blades, 3a rotating shaft, 4 stationary blades, 6 inlet pipe, 8 biological treatment device, 9 outlet, 10 carrier-free zone, 11 plate, 12 baffle plate, 12a opening, 13 Carrier.
Claims (12)
前記反応槽に液体を導入したときの液面から所定の深さに設置された回転翼と、
前記反応槽の底部に固定された放射状に延びる静翼と、
前記反応槽における液面付近に設置された、前記反応槽内の液体を外部に排出する排出口と、
を備えることを特徴とする嫌気性流動床式生物処理装置。 A reaction tank for performing fluidized bed biological treatment using a carrier,
Rotor blades installed at a predetermined depth from the liquid level when introducing the liquid into the reaction tank,
A radially extending stationary blade fixed to the bottom of the reaction vessel;
An outlet installed near the liquid level in the reaction tank, for discharging the liquid in the reaction tank to the outside,
An anaerobic fluidized-bed biological treatment apparatus, comprising:
前記回転翼は、前記回転翼の上方で前記回転翼の回転の影響を受けない液層部分が形成される深さに設置されることを特徴とする嫌気性流動床式生物処理装置。 An anaerobic fluidized-bed biological treatment apparatus according to claim 1,
The anaerobic fluidized-bed biological treatment apparatus, wherein the rotor is installed at a depth above the rotor at which a liquid layer portion not affected by the rotation of the rotor is formed.
前記回転翼は、前記液面からの深さの１／４よりも前記反応槽の底部側に設置されることを特徴とする嫌気性流動床式生物処理装置。 An anaerobic fluidized-bed biological treatment apparatus according to claim 1 or 2,
The anaerobic fluidized-bed biological treatment apparatus, wherein the rotor is installed on a bottom side of the reaction tank with a depth of 1/4 of a depth from the liquid level.
前記回転翼は、長方形状の平板であることを特徴とする嫌気性流動床式生物処理装置。 An anaerobic fluidized-bed biological treatment apparatus according to claim 1 or 2,
An anaerobic fluidized-bed biological treatment apparatus, wherein the rotor is a rectangular flat plate.
前記回転翼の上端部に板体が固定されていることを特徴とする嫌気性流動床式生物処理装置。 An anaerobic fluidized bed biological treatment apparatus according to any one of claims 1 to 4,
An anaerobic fluidized-bed biological treatment apparatus, wherein a plate is fixed to an upper end of the rotor.
前記液面より下で、前記回転翼の上方の前記反応槽の側壁の内周面に、円周方向に、邪魔板が固定されていることを特徴とする嫌気性流動床式生物処理装置。 An anaerobic fluidized-bed biological treatment apparatus according to any one of claims 1 to 5,
An anaerobic fluidized-bed biological treatment apparatus, wherein a baffle is fixed in a circumferential direction on an inner peripheral surface of a side wall of the reaction tank below the liquid level and above the rotary blade.
前記反応槽に液体を導入したときの液面から所定の深さに設置された回転翼と、
前記反応槽の底部に固定された放射状に延びる静翼と、
前記反応槽における液面付近に設置された、前記反応槽内の液体を外部に排出する排出口と、
を備える生物処理装置を用いて嫌気性流動床式生物処理を行うことを特徴とする嫌気性流動床式生物処理方法。 A reaction tank for performing fluidized bed biological treatment using a carrier,
Rotor blades installed at a predetermined depth from the liquid level when introducing the liquid into the reaction tank,
A radially extending stationary blade fixed to the bottom of the reaction vessel;
An outlet installed near the liquid level in the reaction tank, for discharging the liquid in the reaction tank to the outside,
An anaerobic fluidized-bed biological treatment method comprising performing an anaerobic fluidized-bed biological treatment using a biological treatment device provided with:
前記回転翼は、前記回転翼の上方で前記回転翼の回転の影響を受けない液層部分が形成される深さに設置されることを特徴とする嫌気性流動床式生物処理方法。 An anaerobic fluidized bed biological treatment method according to claim 7,
The anaerobic fluidized-bed biological treatment method, wherein the rotor is installed at a depth above the rotor which forms a liquid layer portion that is not affected by the rotation of the rotor.
前記回転翼は、前記液面からの深さの１／４よりも前記反応槽の底部側に設置されることを特徴とする嫌気性流動床式生物処理方法。 An anaerobic fluidized bed biological treatment method according to claim 7 or 8,
The anaerobic fluidized-bed biological treatment method, wherein the rotor is installed on the bottom side of the reaction tank at a depth less than 1/4 of a depth from the liquid level.
前記回転翼は、長方形状の平板であることを特徴とする嫌気性流動床式生物処理方法。 An anaerobic fluidized bed biological treatment method according to claim 7 or 8,
The anaerobic fluidized bed biological treatment method, wherein the rotor is a rectangular flat plate.
前記回転翼の上端部に板体が固定されていることを特徴とする嫌気性流動床式生物処理方法。 An anaerobic fluidized bed biological treatment method according to any one of claims 7 to 10,
An anaerobic fluidized-bed biological treatment method, wherein a plate is fixed to an upper end of the rotor.
前記液面より下で、前記回転翼の上方の前記反応槽の側壁の内周面に、円周方向に、邪魔板が固定されていることを特徴とする嫌気性流動床式生物処理方法。 An anaerobic fluidized-bed biological treatment method according to any one of claims 7 to 11,
An anaerobic fluidized bed biological treatment method, wherein a baffle plate is fixed in a circumferential direction on an inner peripheral surface of a side wall of the reaction tank below the liquid surface and above the rotary blade.
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