JP2022549249A - Biological treatment device, carrier capture device for biological treatment device, water treatment method, and modification method for biological treatment device - Google Patents

Biological treatment device, carrier capture device for biological treatment device, water treatment method, and modification method for biological treatment device Download PDF

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JP2022549249A
JP2022549249A JP2022517994A JP2022517994A JP2022549249A JP 2022549249 A JP2022549249 A JP 2022549249A JP 2022517994 A JP2022517994 A JP 2022517994A JP 2022517994 A JP2022517994 A JP 2022517994A JP 2022549249 A JP2022549249 A JP 2022549249A
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water
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バン コン、 ニエップ ドゥ
バン、 ホップ グェン
裕章 目黒
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Organo Corp
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Organo Corp
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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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

本発明は、担体のスクリーンへの付着を抑制することが可能な生物処理装置を提供することを目的とする。生物処理装置２は、被処理水を浄化するための微生物が固定された担体が流動する生物反応槽２Ａと、生物反応槽２Ａに設けられ、生物反応槽２Ａを、被処理水の供給部２２を含む第１の領域１９と、生物反応槽２Ａの下部で第１の領域１９と連通し、上部のみに生物反応槽２Ａで処理された処理水の流出部２５が形成された第２の領域２０と、に分離する仕切り壁１８と、流出部２５に設けられたスクリーン２７を備え、スクリーン２７は担体の生物反応槽２Ａからの流出を防止する担体捕捉装置２６と、を有する。An object of the present invention is to provide a biological treatment apparatus capable of suppressing adhesion of a carrier to a screen. The biological treatment apparatus 2 includes a biological reaction tank 2A in which a carrier on which microorganisms are immobilized for purifying water to be treated flows, and a biological reaction tank 2A provided in the biological reaction tank 2A. and a second region that communicates with the first region 19 at the bottom of the biological reaction tank 2A and has an outflow part 25 for the treated water treated in the biological reaction tank 2A only at the top. 20 and a partition wall 18, and a screen 27 provided in an outflow part 25. The screen 27 has a carrier trapping device 26 for preventing the carrier from flowing out of the biological reaction tank 2A.

Description

本発明は生物処理装置、生物処理装置の担体捕捉装置、水処理方法及び生物処理装置の改造方法に関する。 TECHNICAL FIELD The present invention relates to a biological treatment device, a carrier capture device for a biological treatment device, a water treatment method, and a modification method for a biological treatment device.

ゲル状や繊維状の担体に保持された嫌気性細菌や好気性細菌などの微生物を用いて生物処理を行う水処理システムが知られている。生物反応槽に供給された被処理水に含まれる有機物が微生物によって分解される。微生物を保持する担体は生物反応槽の内部を流動する。担体の流出を防止するため、生物反応槽の流出口にはスクリーンが設置される。特許第３６６８３５８号明細書には、生物反応槽の本体部から出口側に張り出す流出口が形成され、流出口にスクリーンが設置された生物反応槽が開示されている。 BACKGROUND ART Water treatment systems are known that perform biological treatment using microorganisms such as anaerobic bacteria and aerobic bacteria held in gel-like or fibrous carriers. Organic matter contained in the water to be treated supplied to the biological reactor is decomposed by microorganisms. A carrier containing microorganisms flows inside the bioreactor. A screen is installed at the outlet of the bioreactor to prevent the outflow of the carrier. Japanese Patent No. 3668358 discloses a bioreactor in which an outlet projecting from the main body of the bioreactor toward the outlet side is formed and a screen is installed at the outlet.

特許第３６６８３５８号明細書に開示された生物反応槽においては、スクリーンの接液部はほぼ本体部と対向しており、本体部の液体とこれに含まれる担体は概ね水平方向に流出口に流入する。流出口に流入した担体のほぼ全量がスクリーンに達し、スクリーンに捕捉される。このため、大量の担体がスクリーンに付着し、スクリーンの定期的な清掃が必要となる。 In the bioreactor disclosed in Japanese Patent No. 3668358, the liquid-contacting portion of the screen substantially faces the main body, and the liquid in the main body and the carrier contained therein flow into the outlet in a substantially horizontal direction. do. Almost all of the carrier that has flowed into the outlet reaches the screen and is captured by the screen. As a result, a large amount of carrier adheres to the screen, requiring regular cleaning of the screen.

本発明は担体のスクリーンへの付着を抑制することが可能な生物処理装置を提供することを目的とする。 An object of the present invention is to provide a biological treatment apparatus capable of suppressing adhesion of a carrier to a screen.

本発明の生物処理装置は、被処理水を生物処理するための微生物が固定された担体が流動する生物反応槽と、生物反応槽に設けられ、生物反応槽を、被処理水の供給部を含む第１の領域と、生物反応槽の下部で第１の領域と連通し、上部のみに生物反応槽で処理された処理水の流出部が形成された第２の領域と、に分離する仕切り壁と、流出部に設けられたスクリーンを備え、スクリーンは担体の生物反応槽からの流出を防止する担体捕捉装置と、を有する。 The biological treatment apparatus of the present invention comprises a biological reaction tank in which a carrier on which microorganisms are immobilized for biological treatment of water to be treated flows; and a second zone communicating with the first zone at the bottom of the bioreactor and forming an outlet for the treated water treated in the bioreactor only at the top. It has a wall and a carrier trapping device provided with a screen at the outlet, the screen preventing the carrier from flowing out of the bioreactor.

本発明によれば、生物反応槽は仕切り壁によって第１の領域と第２の領域とに分離されている。第２の領域は生物反応槽の下部で第１の領域と連通し、処理水の流出部は第２の領域の上部のみに形成されている。第２の領域は鉛直方向に延びている。第２の領域に流入した担体は重力によって沈降するため、スクリーンに達する担体の量が抑制される。従って、本発明によれば、担体のスクリーンへの付着を抑制することができる。 According to the invention, the bioreactor is separated into a first zone and a second zone by a partition wall. The second region communicates with the first region at the bottom of the bioreactor, and the treated water outlet is formed only at the top of the second region. The second region extends vertically. Since the carriers that have flowed into the second region settle due to gravity, the amount of carriers that reach the screen is suppressed. Therefore, according to the present invention, adhesion of the carrier to the screen can be suppressed.

上述した、およびその他の、本出願の目的、特徴、および利点は、本出願を例示した添付の図面を参照する以下に述べる詳細な説明によって明らかとなろう。 The above and other objects, features and advantages of the present application will become apparent from the following detailed description which refers to the accompanying drawings illustrating the present application.

以下、図面を参照して本発明の生物処理装置の実施形態について説明する。生物処理装置は水処理システムの一部として使用される。まず、生物処理装置２を含む水処理システムの構成例について説明する。図１は水処理システム１の概略構成を示している。水処理システム１は生物処理装置２と沈殿槽３とを有している。生物処理装置２は、脱窒処理槽２Ａ（第１の生物処理槽）と好気処理槽２Ｂ（第２の生物処理槽）とで構成されている。脱窒処理槽２Ａには、被処理水の供給ラインＬ１と、再循環ポンプ５を備えた再循環ラインＬ２とが接続されている。被処理水は、供給ラインＬ１を通って脱窒処理槽２Ａに供給される。脱窒処理槽２Ａでは脱窒処理または嫌気性処理が行われる。脱窒処理では、水中に酸素が存在していない環境下で、被処理水中の硝酸が微生物の有機物を消費する呼吸のために使われることで、有機物が窒素と炭酸ガスと水とに分解される。嫌気性処理では、水中に溶存酸素及び亜硝酸（ＮＯ２－）、硝酸（ＮＯ３－）の中の酸素が存在していない環境下で、有機物が微生物によって、メタンガスと炭酸ガスと水とに分解される。脱窒処理槽２Ａで処理された水（処理水）は好気処理槽２Ｂに送られる。好気処理槽２Ｂでは好気処理が行わる。好気処理槽２Ｂは曝気装置５５を備えている。曝気装置５５によって好気処理槽２Ｂに空気が送り込まれ、微生物によって残留有機物が炭酸ガスと水とに分解される。好気処理槽２Ｂで処理された水は沈殿槽３に送られ、処理水から微生物汚泥が分離される。微生物汚泥の一部または全量は、再循環ポンプ５によって、再循環ラインＬ２を通って脱窒処理槽２Ａに戻される。以下、再循環ラインＬ２を通って脱窒処理槽２Ａに戻された、微生物汚泥を含む水も、供給ラインＬ１から供給される被処理水と合わせて「被処理水」という。 Hereinafter, embodiments of the biological treatment apparatus of the present invention will be described with reference to the drawings. Biological treatment units are used as part of a water treatment system. First, a configuration example of a water treatment system including the biological treatment device 2 will be described. FIG. 1 shows a schematic configuration of a water treatment system 1. As shown in FIG. A water treatment system 1 has a biological treatment device 2 and a sedimentation tank 3 . The biological treatment apparatus 2 is composed of a denitrification treatment tank 2A (first biological treatment tank) and an aerobic treatment tank 2B (second biological treatment tank). A supply line L1 for the water to be treated and a recirculation line L2 having a recirculation pump 5 are connected to the denitrification treatment tank 2A. The water to be treated is supplied to the denitrification treatment tank 2A through the supply line L1. Denitrification treatment or anaerobic treatment is performed in the denitrification treatment tank 2A. In denitrification, in an environment where there is no oxygen in the water, nitric acid in the water to be treated is used for respiration by microorganisms that consume organic matter, and the organic matter is decomposed into nitrogen, carbon dioxide, and water. be. In anaerobic treatment, organic matter is converted into methane gas, carbon dioxide gas, and water by microorganisms in an environment where dissolved oxygen and oxygen in nitrous acid (NO 2- ) and nitric acid (NO 3- ) do not exist in water. decomposed. The water (treated water) treated in the denitrification treatment tank 2A is sent to the aerobic treatment tank 2B. Aerobic treatment is performed in the aerobic treatment tank 2B. The aerobic treatment tank 2B is equipped with an aerator 55 . Air is sent into the aerobic treatment tank 2B by the aerator 55, and the residual organic matter is decomposed into carbon dioxide gas and water by microorganisms. The water treated in the aerobic treatment tank 2B is sent to the sedimentation tank 3, and microbial sludge is separated from the treated water. Part or all of the microbial sludge is returned to the denitrification treatment tank 2A through the recirculation line L2 by the recirculation pump 5. Hereinafter, the water containing microbial sludge returned to the denitrification treatment tank 2A through the recirculation line L2 is also referred to as "the water to be treated" together with the water to be treated supplied from the supply line L1.

次に、図２～６を参照して生物処理装置２の構成について説明する。図２は図１に示す水処理システム１における生物処理装置２の部分斜視図であり、第３の側壁１５の図示を省略している。図３は図２に示す生物処理装置２の、脱窒処理槽２Ａを示す断面図である。図４は図３のＡ－Ａ線に沿った生物処理装置２の、脱窒処理槽２Ａを示す平面図である。図５は図３のＢ部拡大図である。図６はスクリーン２７の部分斜視図である。以下の説明において、幅方向Ｗは脱窒処理槽２Ａの第１及び第２の側壁１３，１４と平行な方向を意味する。 Next, the configuration of the biological treatment device 2 will be described with reference to FIGS. 2 to 6. FIG. FIG. 2 is a partial perspective view of the biological treatment device 2 in the water treatment system 1 shown in FIG. 1, omitting illustration of the third side wall 15 . FIG. 3 is a sectional view showing the denitrification treatment tank 2A of the biological treatment apparatus 2 shown in FIG. FIG. 4 is a plan view showing the denitrification treatment tank 2A of the biological treatment apparatus 2 taken along line AA of FIG. FIG. 5 is an enlarged view of the B portion in FIG. FIG. 6 is a partial perspective view of the screen 27. FIG. In the following description, the width direction W means the direction parallel to the first and second side walls 13, 14 of the denitrification treatment tank 2A.

脱窒処理槽２Ａには被処理水と、微生物（嫌気性細菌）が固定された担体とが収容されている。生物処理装置２は鉄筋コンクリート製の躯体であり、脱窒処理槽２Ａ及び好気処理槽２Ｂの底部１２Ａを構成する底板１２と、底板１２に接続された４つの側面１３～１６と、天板１７と、を有している。脱窒処理槽２Ａの出口側の側壁を第１の側壁１３、第１の側壁１３の反対側に位置する脱窒処理槽２Ａの入口側の側壁を第２の側壁１４、第１及び第２の側壁１３，１４と直交する脱窒処理槽２Ａ及び好気処理槽２Ｂの側壁を第３及び第４の側壁１５，１６という。 The denitrification treatment tank 2A contains water to be treated and a carrier on which microorganisms (anaerobic bacteria) are fixed. The biological treatment apparatus 2 is a frame made of reinforced concrete, and includes a bottom plate 12 that constitutes the bottom 12A of the denitrification treatment tank 2A and the aerobic treatment tank 2B, four side surfaces 13 to 16 connected to the bottom plate 12, and a top plate 17. and have The side wall on the outlet side of the denitrification treatment tank 2A is called a first side wall 13, the side wall on the inlet side of the denitrification treatment tank 2A located on the opposite side of the first side wall 13 is called a second side wall 14, and the first and second Side walls of the denitrification treatment tank 2A and the aerobic treatment tank 2B perpendicular to the side walls 13, 14 of are referred to as third and fourth side walls 15, 16, respectively.

脱窒処理槽２Ａには仕切り壁１８が設けられている。脱窒処理槽２Ａは仕切り壁１８によって第１の領域１９と第２の領域２０とに分離されている。第１の領域１９は、主に被処理水を脱窒処理するための領域である。第１の領域１９は、被処理水の供給部２２と撹拌機２３とを有している。被処理水の供給部２２は供給ラインＬ１と再循環ラインＬ２とからなる。攪拌機２３の位置、個数及び仕様は、脱窒処理槽２Ａ内の担体が十分に撹拌できるような一般的な選定基準で決定される。脱窒処理槽２Ａは無酸素または嫌気性処理を行うものであるため、空気を供給する曝気装置は設けられていない。酸素の侵入をできるだけ防止するため、第１の領域１９は天板１７で覆われている。天板１７には供給ラインＬ１と再循環ラインＬ２が通るための開口１７Ａが設けられている。仕切り壁１８は天板１７から下方に伸びており、下端部は脱窒処理槽２Ａの底部１２Ａと離隔している。従って、第１の領域１９と第２の領域２０は脱窒処理槽２Ａの下部の連通部２１で互いに連通している。仕切り壁１８は鉄筋コンクリートで作られているが、金属プレートで作成してもよい。金属プレートは例えば、ステンレス鋼のプレート、ステンレスでライニングされた鋼板を含む。 A partition wall 18 is provided in the denitrification treatment tank 2A. The denitrification treatment tank 2A is separated into a first area 19 and a second area 20 by a partition wall 18 . The first region 19 is a region mainly for denitrifying the water to be treated. The first region 19 has a feeder 22 for water to be treated and a stirrer 23 . The supply section 22 for the water to be treated comprises a supply line L1 and a recirculation line L2. The position, number and specifications of the agitator 23 are determined according to general selection criteria so that the carrier in the denitrification treatment tank 2A can be sufficiently agitated. Since the denitrification treatment tank 2A performs anoxic or anaerobic treatment, it is not provided with an aerator for supplying air. The first area 19 is covered with a top plate 17 in order to prevent oxygen from entering as much as possible. The top plate 17 is provided with an opening 17A through which the supply line L1 and the recirculation line L2 pass. The partition wall 18 extends downward from the top plate 17, and its lower end is separated from the bottom 12A of the denitrification treatment tank 2A. Therefore, the first area 19 and the second area 20 are communicated with each other through the communicating portion 21 at the bottom of the denitrification treatment tank 2A. The partition wall 18 is made of reinforced concrete, but it may also be made of a metal plate. Metal plates include, for example, stainless steel plates and stainless steel lined steel plates.

供給ラインＬ１と再循環ラインＬ２は脱窒処理槽２Ａの入口側、すなわち第２の側壁１４の近傍に設けられている。供給ラインＬ１と再循環ラインＬ２は、第２の側壁１４の幅方向Ｗにおける中心線の両側に、当該中心線に関しほぼ対称の位置に設けられている。このため、供給ラインＬ１と再循環ラインＬ２から供給された被処理水はほぼ第２の側壁１４と垂直な方向に、第２の領域２０に向かって流動する。供給ラインＬ１と再循環ラインＬ２の側面には、脱窒処理槽２Ａに開口し、被処理水を脱窒処理槽２Ａに供給する複数の供給口２４が形成されている。複数の供給口２４は第２の側壁１４と対向しており、被処理水を第２の側壁１４に向けて放出する。被処理水は第２の側壁１４に衝突し、その後向きを反対方向に変えて第２の領域２０に向かって流動する。従って、被処理水は第１の領域１９内で大きな偏流を生じにくくなり、被処理水の流速や撹拌機２３により、担体が第１の領域１９内で効率よく流動することができる。 The supply line L1 and the recirculation line L2 are provided on the inlet side of the denitrification treatment tank 2A, that is, near the second side wall 14. As shown in FIG. The supply line L1 and the recirculation line L2 are provided on both sides of the center line in the width direction W of the second side wall 14 at substantially symmetrical positions with respect to the center line. Therefore, the water to be treated supplied from the supply line L1 and the recirculation line L2 flows toward the second area 20 in a direction substantially perpendicular to the second side wall 14 . A plurality of supply ports 24 are formed on the sides of the supply line L1 and the recirculation line L2 to open into the denitrification treatment tank 2A and supply the water to be treated to the denitrification treatment tank 2A. A plurality of supply ports 24 face the second side wall 14 and discharge the water to be treated toward the second side wall 14 . The water to be treated collides with the second side wall 14 and then turns in the opposite direction to flow toward the second region 20 . Therefore, the water to be treated is less likely to cause a large drift in the first region 19 , and the carrier can efficiently flow in the first region 19 due to the flow velocity of the water to be treated and the stirrer 23 .

さらに、第１の阻流板５１を設けることで、第１の領域１９内でより偏流を生じにくくすることができる。第１の阻流板５１は、第１の領域１９内でより偏流を抑えることができれば、その形状、配置等に制限はない。本実施形態では、図３，図４に示すように、第１の阻流板５１は供給ラインＬ１及び再循環ラインＬ２の下流側に設けられた仕切り壁１８と同様な壁である。第１の阻流板５１を設けない場合、供給ラインＬ１や再循環ラインＬ２の上部から供給される被処理水は第２の領域２０との連通部２１に向かう流れが第１の領域１９に対して均一にならず、第１の領域１９の仕切り壁１８の上部付近の水に偏流が生じ、偏流が担体をスクリーンへ到達させるおそれがある。第１の阻流板５１を設けることで、第１の領域１９に供給された被処理水は第１の阻流板５１を超えた際に第１の領域１９に対して均一になるため、仕切り壁１８の上部付近の水に偏流が生じるのを抑制することができる。 Furthermore, by providing the first baffle plate 51 , it is possible to make it more difficult for drift to occur in the first region 19 . The first baffle plate 51 is not limited in its shape, arrangement, etc., as long as it can further suppress the drift in the first region 19 . In this embodiment, as shown in FIGS. 3 and 4, the first baffle 51 is a wall similar to the partition wall 18 provided downstream of the supply line L1 and the recirculation line L2. When the first baffle plate 51 is not provided, the water to be treated supplied from the upper part of the supply line L1 or the recirculation line L2 flows toward the communication part 21 with the second region 20 in the first region 19. On the other hand, the water is not uniform, and the water near the upper portion of the partition wall 18 in the first region 19 may have a drift, and the drift may cause the carrier to reach the screen. By providing the first baffle plate 51, the water to be treated supplied to the first region 19 becomes uniform with respect to the first region 19 when it exceeds the first baffle plate 51. It is possible to suppress the occurrence of drift in water in the vicinity of the upper portion of the partition wall 18 .

第２の領域２０は脱窒処理槽２Ａで処理された水（処理水）の流出部２５を含む領域であり、その容積は第１の領域１９よりも小さい。第２の領域２０は第１の側壁１３と第３の側壁１５と第４の側壁１６と仕切り壁１８とによって画定されている。天板１７は第２の領域２０には設けられていない。処理水の流出部２５は第２の領域２０の上部のみに、より正確には第１の側壁１３の頂部１３Ａに形成されている。第１の側壁１３の頂部１３Ａは第３の側壁１５、第４の側壁１６、仕切り壁１８の頂部より低い水平面であり、第２の領域２０に流入した処理水は第１の側壁１３の頂部１３Ａを超えて好気処理槽２Ｂに流出する。 The second area 20 is an area including an outflow part 25 of water (treated water) treated in the denitrification treatment tank 2A, and its volume is smaller than that of the first area 19 . The second region 20 is defined by the first side wall 13 , the third side wall 15 , the fourth side wall 16 and the partition wall 18 . Top plate 17 is not provided in second region 20 . The treated water outflow portion 25 is formed only in the upper portion of the second region 20, more precisely, in the top portion 13A of the first side wall 13. As shown in FIG. The top portion 13A of the first side wall 13 is a horizontal plane lower than the top portions of the third side wall 15, the fourth side wall 16, and the partition wall 18, and the treated water flowing into the second region 20 reaches the top portion of the first side wall 13. It flows out to the aerobic treatment tank 2B beyond 13A.

流出部２５、より正確には第１の側壁１３の頂部１３Ａに、担体の脱窒処理槽２Ａからの流出を防止する担体捕捉装置２６が設けられている。担体捕捉装置２６は、スクリーン２７と支持部２８とを有しており、第１の側壁１３の頂部１３Ａに支持部２８が固定されている。スクリーン２７はウェッジワイヤスクリーンからなる。図５，６に示すように、スクリーン２７は複数のワイヤロッド２９と複数のサポートロッド３０とから構成されている。ワイヤロッド２９は互いに平行に、且つ互いに間隔をあけて配置されている。サポートロッド３０はワイヤロッド２９と直交する方向に延びており、互いに平行に、且つ互いに間隔をあけて配置されている。サポートロッド３０の間隔はワイヤロッド２９の間隔よりも大きい。各ワイヤロッド２９は幅広面２９Ａと幅狭面２９Ｂとを有する逆三角形断面形状を有し、幅狭面２９Ｂがサポートロッド３０に固定されている。互いに隣接する幅広面２９Ａの間の間隔は、処理水の流通を許容し且つ担体の平均直径より十分に小さい寸法とされている。サポートロッド３０は支持部２８に固定されている。支持部２８は金属プレートからなり、ボルト（図示せず）によって第１の側壁１３の頂部１３Ａに固定されている。スクリーン２７は幅広面２９Ａが処理水の流動方向（図６に矢印で示す）における上流側、幅狭面２９Ｂが処理水の流動方向における下流側となる向きで配置されている。処理水はワイヤロッド２９の幅広面２９Ａの間を通り、処理水に含まれる担体が幅広面２９Ａ、または幅広面２９Ａの間の隙間で捕捉される。スクリーン２７の構成はウェッジワイヤスクリーンに限定されず、処理水を通し担体を捕捉できる限りあらゆるスクリーンを使用することができる。例えば、多数の小孔が形成されたパンチングメタルをスクリーン２７として用いることができる。 At the outflow part 25, more precisely at the top part 13A of the first side wall 13, a carrier capture device 26 is provided to prevent the carrier from flowing out of the denitrification treatment tank 2A. The carrier capturing device 26 has a screen 27 and a support portion 28 , and the support portion 28 is fixed to the top portion 13 A of the first side wall 13 . The screen 27 consists of a wedge wire screen. As shown in FIGS. 5 and 6, the screen 27 is composed of a plurality of wire rods 29 and a plurality of support rods 30. FIG. The wire rods 29 are arranged parallel to each other and spaced from each other. The support rods 30 extend in a direction orthogonal to the wire rods 29 and are arranged parallel to and spaced apart from each other. The spacing of the support rods 30 is greater than the spacing of the wire rods 29 . Each wire rod 29 has an inverted triangular cross-sectional shape with a wide side 29A and a narrow side 29B, and the narrow side 29B is fixed to the support rod 30. FIG. The spacing between adjacent wide faces 29A is dimensioned to allow flow of treated water and sufficiently smaller than the average diameter of the carrier. A support rod 30 is fixed to the support portion 28 . The support portion 28 is made of a metal plate and fixed to the top portion 13A of the first side wall 13 by bolts (not shown). The screen 27 is arranged such that the wide surface 29A is upstream in the flow direction of the treated water (indicated by an arrow in FIG. 6), and the narrow surface 29B is downstream in the flow direction of the treated water. The treated water passes between the wide surfaces 29A of the wire rod 29, and the carriers contained in the treated water are trapped in the wide surfaces 29A or the gaps between the wide surfaces 29A. The configuration of the screen 27 is not limited to a wedge wire screen, and any screen can be used as long as it can pass the treated water and trap the carriers. For example, a punching metal having a large number of small holes can be used as the screen 27 .

図５に示すように、スクリーン２７は鉛直方向Ｖに対して傾斜しているのが好ましい。すなわち、スクリーン２７と支持部２８は９０度以外の角度で交差している。スクリーン２７を傾斜させることで、スクリーン２７の接液面積を増加させることができる。スクリーン２７は第２の領域２０側に傾斜していてもよいし、第２の領域２０の反対側（好気処理槽２Ｂ側）に傾斜していてもよい。前者の構成は、スクリーン２７に付着した担体が第２の領域２０に落下するためより好ましい。 The screen 27 is preferably inclined with respect to the vertical direction V, as shown in FIG. That is, the screen 27 and the supporting portion 28 intersect at an angle other than 90 degrees. By inclining the screen 27, the wetted area of the screen 27 can be increased. The screen 27 may be inclined toward the second area 20, or may be inclined toward the opposite side of the second area 20 (toward the aerobic treatment tank 2B). The former configuration is more preferable because the carriers adhering to the screen 27 fall to the second area 20 .

担体捕捉装置２６は、スクリーン２７の第２の領域２０の反対側（好気処理槽２Ｂ側）に洗浄装置３１を備えることができる。洗浄装置３１はスクリーン２７に洗浄用流体を噴射する。洗浄装置３１は洗浄用流体を供給する配管３２を有している。配管３２はスクリーン２７の幅方向Ｗに、スクリーン２７のほぼ全幅と対向して延びている。配管３２のスクリーン２７と対向する面に洗浄用流体を噴射する多数のノズル３３が形成されている。後述するように、スクリーン２７に付着する担体の量は限られているが、スクリーン２７への担体の付着を完全に防止することは難しい。このため、スクリーン２７に付着した担体を定期的に除去することが望ましい。洗浄用流体は好ましくは水または空気である。洗浄装置３１は第２の領域２０側に設けられていても、第２の領域２０側と第２の領域２０の反対側の両方に設けられていてもよい。 The carrier trapping device 26 can be provided with a cleaning device 31 on the opposite side of the second area 20 of the screen 27 (on the side of the aerobic treatment tank 2B). The cleaning device 31 sprays cleaning fluid onto the screen 27 . The washing device 31 has a pipe 32 for supplying washing fluid. The pipe 32 extends in the width direction W of the screen 27 so as to face substantially the entire width of the screen 27 . A large number of nozzles 33 for jetting cleaning fluid are formed on the surface of the pipe 32 facing the screen 27 . As will be described later, the amount of carriers adhering to the screen 27 is limited, but it is difficult to completely prevent the adherence of the carriers to the screen 27 . Therefore, it is desirable to periodically remove the carrier adhering to the screen 27 . The cleaning fluid is preferably water or air. The cleaning device 31 may be provided on the second area 20 side, or may be provided on both the second area 20 side and the opposite side of the second area 20 .

次に、図３を参照して、生物処理装置２を用いた水処理方法の手順、ないし生物処理装置２、特に脱窒処理槽２Ａの動作について説明する。上述のように、脱窒処理槽２Ａの第１の領域１９に供給された被処理水は第１の領域１９を第２の領域２０に向かって流動しながら、担体Ｃに固定された微生物によって無酸素もしくは嫌気性処理を受ける。処理水は第１の領域１９と第２の領域２０との間の連通部２１を通って第２の領域２０に流入する。処理水は第２の領域２０を上昇し、担体Ｃも処理水の上昇流に随伴して第２の領域２０を上昇する。しかし、担体Ｃの比重は処理水の比重より大きいため、ほとんどの担体Ｃは流出部２５に達することなく、重力によって下降ないし沈降する。連通部２１から第２の領域２０の下部にかけての領域では、第２の領域２０に流入する処理水により生み出された流れと、攪拌機２３により生み出された流れにより、流出部２５に向かう処理水及び担体Ｃの流れと、第２の領域２０を下降して第１の領域１９に戻る担体Ｃの流れが共存していると考えられる。第２の領域２０に侵入したほとんどの担体Ｃは、第２の領域２０を上昇し、次に下降し、第１の領域１９に戻ると考えられる。連通部２１から第１の領域１９に戻る処理水の流れによって、担体Ｃが第２の領域２０の底部１２Ａや連通部２１に滞積することが防止される。 Next, with reference to FIG. 3, the procedure of the water treatment method using the biological treatment apparatus 2, or the operation of the biological treatment apparatus 2, particularly the denitrification treatment tank 2A, will be described. As described above, the water to be treated supplied to the first region 19 of the denitrification treatment tank 2A flows through the first region 19 toward the second region 20, and the microorganisms immobilized on the carrier C Receive anoxic or anaerobic treatment. Treated water flows into the second area 20 through the communicating portion 21 between the first area 19 and the second area 20 . The treated water rises in the second region 20, and the carrier C also rises in the second region 20 with the upward flow of the treated water. However, since the specific gravity of the carrier C is higher than that of the treated water, most of the carrier C does not reach the outflow part 25 and descends or sinks due to gravity. In the area from the communication part 21 to the lower part of the second area 20, the flow generated by the treated water flowing into the second area 20 and the flow generated by the stirrer 23 flow the treated water toward the outflow part 25 and It is considered that the flow of carriers C and the flow of carriers C descending through the second region 20 and returning to the first region 19 coexist. It is believed that most of the carriers C that have entered the second region 20 ascend the second region 20 , then descend and return to the first region 19 . The flow of the treated water returning from the communication portion 21 to the first region 19 prevents the carrier C from accumulating on the bottom portion 12A of the second region 20 and the communication portion 21 .

処理水は第２の領域２０の流出部２５に達し、第１の側壁１３の頂部１３Ａを超える。処理水はスクリーン２７を通過し、脱窒処理槽２Ａから好気処理槽２Ｂに流出する。第１の領域１９内の担体Ｃは、ほとんどが撹拌機２３により生み出される流れにより第１の領域１９に留まる。一部の担体Ｃは、側壁１４から側壁１３への流れにより第２の領域２０に流出するが、担体Ｃの比重が液体の比重より大きいため、第２の領域２０内で沈降する。しかし、第２の領域２０に流出した担体Ｃの一部は、沈降することなく第２の領域２０の流出部２５に達する可能性がある。第２の領域２０の流出部２５に達した担体Ｃは、第１の側壁１３の頂部１３Ａに設けられたスクリーン２７に捕捉され、脱窒処理槽２Ａから流出することが防止される。 Treated water reaches the outlet 25 of the second region 20 and over the top 13A of the first sidewall 13 . The treated water passes through the screen 27 and flows out from the denitrification treatment tank 2A to the aerobic treatment tank 2B. The carrier C in the first zone 19 mostly stays in the first zone 19 due to the flow generated by the stirrer 23 . Some of the carriers C flow from the side wall 14 to the side wall 13 and flow out to the second region 20, but settle in the second region 20 because the specific gravity of the carriers C is greater than that of the liquid. However, part of the carrier C that has flowed out to the second area 20 may reach the outflow part 25 of the second area 20 without settling. The carrier C reaching the outflow part 25 of the second area 20 is caught by the screen 27 provided on the top part 13A of the first side wall 13 and prevented from flowing out of the denitrification treatment tank 2A.

仕切り壁１８と脱窒処理槽２Ａの底部１２Ａとの離隔距離Ｄは所定の範囲に設定することが望ましい。離隔距離Ｄが小さすぎると、連通部２１の圧力損失が大きくなり第２の領域２０に十分な水量を供給することができない。所定の範囲は、例えば、離隔距離Ｄと脱窒処理槽２Ａの幅方向Ｗの寸法とを乗じて算出される面積が、第２の領域２０の流路断面積以上であるように設定されることが望ましい。また、生物処理装置２の停止時には液体の流動がないため、比重の大きい担体Ｃが下降し第１の領域１９の底面に堆積する。離隔距離Ｄが小さい場合、底部１２Ａに堆積した担体Ｃが連通部２１を塞ぐ可能性がある。この状態で生物処理装置２を再起動すると、連通部２１を塞いでいる担体が第２の領域２０に押し出される。この結果、大量の担体がスクリーン２７に到達し、スクリーン２７が閉塞する可能性がある。従って、離隔距離Ｄは生物処理装置２の停止時に底面に堆積した担体層の厚さよりも大きくすることが好ましい。これによって、連通部２１において、底面に堆積した担体の上方に流路が確保され、第１の領域１９の液体が担体の上方を通って第２の領域２０に流れる。 It is desirable to set the separation distance D between the partition wall 18 and the bottom portion 12A of the denitrification treatment tank 2A within a predetermined range. If the separation distance D is too small, the pressure loss of the communicating portion 21 becomes large and a sufficient amount of water cannot be supplied to the second region 20 . The predetermined range is set, for example, so that the area calculated by multiplying the separation distance D by the dimension in the width direction W of the denitrification treatment tank 2A is equal to or larger than the channel cross-sectional area of the second region 20. is desirable. Further, when the biological treatment apparatus 2 is stopped, the liquid does not flow, so the carrier C having a large specific gravity descends and deposits on the bottom surface of the first region 19 . If the separation distance D is small, the carriers C deposited on the bottom portion 12A may block the communicating portion 21 . When the biological treatment device 2 is restarted in this state, the carrier blocking the communicating portion 21 is pushed out to the second area 20 . As a result, a large amount of carrier may reach the screen 27 and clog the screen 27 . Therefore, the separation distance D is preferably made larger than the thickness of the carrier layer deposited on the bottom surface when the biological treatment device 2 is stopped. As a result, a flow path is secured above the carrier deposited on the bottom surface in the communicating portion 21 , and the liquid in the first region 19 flows over the carrier to the second region 20 .

脱窒処理槽２Ａの底部１２Ａに堆積する担体層の厚さは担体の充填率に依存する。充填率は脱窒処理槽２Ａに保持されている液体の容積に対する担体の体積比を意味する。脱窒処理槽２Ａはほぼ直方体であるため、充填率は第１の側壁１３の頂部１３Ａと脱窒処理槽２Ａの底部１２Ａとの鉛直距離Ｈに対する、仕切り壁１８と脱窒処理槽２Ａの底部１２Ａとの離隔距離Ｄの比率に概ね一致する。以上より、仕切り壁１８と脱窒処理槽２Ａの底部１２Ａとの離隔距離Ｄは、第１の側壁１３の頂部１３Ａと脱窒処理槽２Ａの底部１２Ａとの鉛直距離Ｈに担体の充填率を乗じた値より大きいことが望ましい。充填率は被処理水の水質などによって変動する。しかし、充填率が４０％を超えることはほとんどなく、５０％を超えることはほぼあり得ない。従って、現実的には、離隔距離Ｄを第１の側壁１３の頂部１３Ａと脱窒処理槽２Ａの底部１２Ａとの鉛直距離Ｈの１／２以上確保する必要性はない。換言すれば、離隔距離Ｄは第１の側壁１３の頂部１３Ａと脱窒処理槽２Ａの底部１２Ａとの鉛直距離Ｈの１／２未満でよい。 The thickness of the carrier layer deposited on the bottom 12A of the denitrification treatment tank 2A depends on the packing rate of the carrier. The filling rate means the volume ratio of the carrier to the volume of the liquid held in the denitrification treatment tank 2A. Since the denitrification treatment tank 2A is substantially a rectangular parallelepiped, the filling rate is the vertical distance H between the top part 13A of the first side wall 13 and the bottom part 12A of the denitrification treatment tank 2A. It roughly matches the ratio of the separation distance D to 12A. From the above, the separation distance D between the partition wall 18 and the bottom 12A of the denitrification treatment tank 2A is the vertical distance H between the top 13A of the first side wall 13 and the bottom 12A of the denitrification treatment tank 2A. It is desirable to be larger than the multiplied value. The filling rate varies depending on the quality of the water to be treated. However, the filling factor rarely exceeds 40% and almost never exceeds 50%. Therefore, in reality, it is not necessary to secure the separation distance D to be 1/2 or more of the vertical distance H between the top portion 13A of the first side wall 13 and the bottom portion 12A of the denitrification treatment tank 2A. In other words, the separation distance D may be less than half the vertical distance H between the top portion 13A of the first side wall 13 and the bottom portion 12A of the denitrification treatment tank 2A.

上述の通り、第２の領域２０では担体を処理水の上昇流に打ち勝って沈降させるため、第２の領域２０における処理水の流速Ｖは、少なくとも担体の沈降速度より小さいことが望ましい。沈降速度は処理水の性状と担体の種類によって予め求めることができる。第２の領域２０における処理水の流速Ｖは、脱窒処理槽２Ａに供給される被処理水の流量（すなわち、第２の領域２０に供給される処理水の流量）と、第２の領域２０の流路断面とで決定される。担体が確実に沈降するようにするため、第２の領域２０における処理水の流速Ｖは安全率を考慮して決定することが望ましい。安全率は１．２～２．０程度の範囲から決定するのが望ましい。換言すれば、第２の領域２０における処理水の流速Ｖは担体の沈降速度の０．５～０．８倍とすることが望ましい。生物処理装置２の単位時間当たり処理量が決まっている場合は、第２の領域２０における処理水の流速Ｖが所定の値となるように、第２の領域２０の流路断面を決定することが望ましい。 As described above, the flow velocity V of the treated water in the second area 20 is desirably smaller than the sedimentation velocity of the carriers, in order to overcome the upward flow of the treated water and settle the carriers in the second area 20 . The sedimentation velocity can be determined in advance according to the properties of treated water and the type of carrier. The flow velocity V of the treated water in the second region 20 is determined by the flow rate of the water to be treated supplied to the denitrification treatment tank 2A (that is, the flow rate of the treated water supplied to the second region 20) and the second region 20 channel cross-sections. In order to ensure that the carrier settles, it is desirable to determine the flow velocity V of the treated water in the second region 20 in consideration of a safety factor. It is desirable to determine the safety factor within the range of about 1.2 to 2.0. In other words, the flow velocity V of the treated water in the second region 20 is desirably 0.5 to 0.8 times the sedimentation velocity of the carrier. When the throughput per unit time of the biological treatment device 2 is determined, the cross section of the flow path of the second region 20 is determined so that the flow velocity V of the treated water in the second region 20 becomes a predetermined value. is desirable.

第２の領域２０から第１の側壁１３へ越流する水の流れは、供給ラインＬ１と循環ラインＬ２とによって規定される流量に依存するが、上述の通り、攪拌機２３によって生じた偏流が担体と共に第２の領域２０の上部に達して、担体がスクリーンに付着することがある。第２の阻流板５２を設けることで、攪拌機２３によって生じる流れを抑制し、担体捕捉装置２６に到達する担体Ｃの量を抑えることができる。第２の阻流板５２は、担体捕捉装置２６に到達する担体Ｃの量を抑えることができれば、その形状、配置等に制限はない。本実施形態では、図３，図４に示すように、第２の阻流板５２は、第１の側壁１３から側方に突き出す邪魔板である。第２の阻流板５２は、第２の領域２０における処理水の上昇流を抑制する。図３に示すように、第２の阻流板５２は下方向に傾斜している。これによって、第２の阻流板５２の上面に担体が蓄積せず、一旦上昇した担体を第２の阻流板５２の上面に沿って降下ないし沈降させることができる。第２の阻流板５２を設けることで、担体捕捉装置２６に到達する担体Ｃの量を抑えることができるため、担体捕捉装置２６のスクリーン２７をより小さくすることができる。 The flow of water that overflows from the second region 20 to the first side wall 13 depends on the flow rate defined by the supply line L1 and the circulation line L2. , the upper portion of the second region 20 may be reached and the carrier may adhere to the screen. By providing the second baffle plate 52, the flow generated by the stirrer 23 can be suppressed, and the amount of the carrier C reaching the carrier capturing device 26 can be suppressed. The second baffle plate 52 is not limited in its shape, arrangement, etc., as long as the amount of carriers C reaching the carrier capturing device 26 can be suppressed. In this embodiment, as shown in FIGS. 3 and 4, the second baffle plate 52 is a baffle plate protruding sideways from the first side wall 13 . The second baffle plate 52 suppresses upward flow of treated water in the second region 20 . As shown in FIG. 3, the second baffle plate 52 slopes downward. This prevents the carriers from accumulating on the upper surface of the second baffle plate 52 , and allows the carriers that have once risen to descend or sink along the upper surface of the second baffle plate 52 . By providing the second baffle plate 52, the amount of carriers C reaching the carrier capturing device 26 can be suppressed, so the screen 27 of the carrier capturing device 26 can be made smaller.

本実施形態は以下の長所を有する。上述のように、第２の領域２０の入口（連通部２１）は脱窒処理槽２Ａの下部に位置しており、第２の領域２０の出口は第２の領域２０の上部のみにある。換言すれば、流出部２５ないしスクリーン２７は、連通部２１より上方且つ第１の領域１９から水平方向に直視不能な位置に設けられている。この構成によって、処理水は脱窒処理槽２Ａを流出する直前に必ず上昇流となって流動し、処理水から担体が分離される。スクリーン２７に達する担体の数が連通部２１を通過する担体の数より大幅に低減するため、スクリーン２７の接液面積は小さくてよい。換言すれば、ほとんどの担体は第２の領域２０の縦方向流路構成によって処理水から分離されるため、スクリーン２７は主にバックアップとして機能する。このため、スクリーン２７の小型化とコストダウンが可能である。スクリーン２７を清掃する頻度及び／または清掃時間も抑えることができる。 This embodiment has the following advantages. As described above, the inlet (communication part 21) of the second area 20 is located at the bottom of the denitrification treatment tank 2A, and the outlet of the second area 20 is only at the top of the second area 20. In other words, the outflow portion 25 or the screen 27 is provided above the communication portion 21 and at a position that is not directly visible in the horizontal direction from the first region 19 . With this configuration, the treated water always flows upward just before it flows out of the denitrification treatment tank 2A, and the carrier is separated from the treated water. Since the number of carriers reaching the screen 27 is much smaller than the number of carriers passing through the communicating portion 21, the wetted area of the screen 27 may be small. In other words, the screen 27 functions primarily as a backup since most of the carriers are separated from the treated water by the longitudinal channel configuration of the second region 20 . Therefore, the size and cost of the screen 27 can be reduced. The frequency and/or cleaning time for cleaning the screen 27 can also be reduced.

従来のスクリーンでは多くの部分が脱窒処理槽２Ａに水没していたため、スクリーンの清掃方法が制約されている。脱窒処理槽２Ａの水抜きを行えば、清掃は容易に行うことができるが、この方法では生物処理装置２を停止する必要がある。稼働中に水没部を清掃するためには特別な設備が必要となり、清掃コストが増加する。これに対して、本実施形態ではスクリーン２７が処理水が越流する箇所に設けられているため、稼働中に容易に清掃ができ、清掃コストも抑えられる。また、槽内の水を抜かなくても被処理水の供給を停止するだけでスクリーン２７はほぼ全域が露出するため、効率よく清掃ができる。このメリットは無酸素または嫌気性処理において特に顕著である。前述の通り、好気性処理では一般に曝気装置が設けられ、曝気装置から噴出する空気によってスクリーン２７が定常的に洗浄される。しかしながら、無酸素または嫌気性処理では脱窒処理槽２Ａへの空気の流入を避けることが望ましいため、曝気装置を用いた洗浄を行うと、処理効率が低下する。また、空気曝気したときの空気の溶解効率は水深が深いほど高くなるため、スクリーン２７に水没部があると不利になる。このため、嫌気性処理では好気性処理と比べて曝気条件を緩和せざるを得ず、スクリーン２７に担体が付着しやすい。本実施形態ではスクリーン２７の清掃が容易であるため、嫌気性処理におけるこのような問題点の解決が容易である。また、本実施形態では、第１の領域１９が仕切り壁１８で第２の領域２０と隔離されているため、第１の領域１９に空気が流入しにくい。このため、洗浄装置３１でスクリーン２７を清掃する場合、洗浄用流体として空気を使用することができる。 Since many parts of the conventional screen were submerged in the denitrification treatment tank 2A, the method of cleaning the screen is restricted. Cleaning can be easily performed by draining the denitrification treatment tank 2A, but this method requires the biological treatment apparatus 2 to be stopped. Special equipment is required to clean the submerged portion during operation, which increases the cleaning cost. On the other hand, in this embodiment, since the screen 27 is provided at the place where the treated water overflows, cleaning can be easily performed during operation, and the cleaning cost can be suppressed. In addition, since the screen 27 is exposed almost entirely by simply stopping the supply of the water to be treated without draining the water in the tank, cleaning can be efficiently performed. This advantage is particularly pronounced in anoxic or anaerobic processing. As described above, an aerator is generally provided in aerobic treatment, and the screen 27 is constantly washed by the air blown out from the aerator. However, since it is desirable to avoid the inflow of air into the denitrification treatment tank 2A in the anoxic or anaerobic treatment, cleaning using an aerator lowers the treatment efficiency. Further, since the dissolution efficiency of air during air aeration increases as the depth of water increases, it is disadvantageous if the screen 27 has a submerged portion. Therefore, in anaerobic treatment, the aeration conditions must be relaxed compared to aerobic treatment, and the carrier tends to adhere to the screen 27 . Since the screen 27 can be easily cleaned in this embodiment, it is easy to solve such problems in the anaerobic treatment. Further, in the present embodiment, since the first area 19 is separated from the second area 20 by the partition wall 18 , air is less likely to flow into the first area 19 . Therefore, when cleaning the screen 27 with the cleaning device 31, air can be used as the cleaning fluid.

以上、本発明を一実施形態によって説明したが、本発明はこの実施形態に限定されず、除去する物質の種類や濃度等によってさまざまな態様で修正することができる。例えば、好気処理槽２Ｂを設けずに、脱窒処理槽２Ａから排出される水を沈澱槽３に供給することができる。また、好気処理槽２Ｂにも同様の担体捕捉装置２６を設けることができる。好気性細菌を固定する担体はスポンジなどの軽量な物質から形成されるため、嫌気性微生物の担体と比べて重力による沈降が生じにくい。しかし、水分を含んだ担体の比重は被処理水の比重より大きい場合もあり、本発明の効果が得られる場合がある。また、一般的には、本実施形態のように一つの仕切り壁１８を設けるだけで、担体を液体から分離する十分な効果が得られるが、例えば担体の比重が処理水の比重に近く、重力による担体の分離効果が小さい場合、仕切り壁１８の上流に底板１２から立ち上がる他の仕切り壁を配置することもできる。 Although the present invention has been described in terms of one embodiment, the present invention is not limited to this embodiment, and can be modified in various ways depending on the type and concentration of substances to be removed. For example, the water discharged from the denitrification treatment tank 2A can be supplied to the sedimentation tank 3 without providing the aerobic treatment tank 2B. A similar carrier capture device 26 can also be provided in the aerobic treatment tank 2B. Since the carrier for immobilizing aerobic bacteria is made of a lightweight material such as sponge, sedimentation due to gravity is less likely to occur than carriers for anaerobic microorganisms. However, the specific gravity of the carrier containing water may be greater than the specific gravity of the water to be treated, and the effects of the present invention may be obtained. In general, providing only one partition wall 18 as in the present embodiment provides a sufficient effect of separating the carrier from the liquid. If the separation effect of the carrier by is small, another partition wall rising from the bottom plate 12 can be arranged upstream of the partition wall 18 .

本発明は生物処理装置の改造方法に適用することができる。例えば、生物反応槽の一つの側面に大型のスクリーンが取り付けられている生物処理装置を、本実施形態と同様の構成の生物処理装置に改造することができる。改造工事は以下の手順で行うことができる。まず、大型のスクリーンを取り外し、第１の側壁１３を設ける。生物反応槽の内側に仕切り壁１８を設け、第１の側壁１３の頂部１３Ａに本実施形態の小型のスクリーン２７を含む担体捕捉装置２６を設ける。施工性の観点から、仕切り壁１８は金属プレートで作成することが好ましい。 INDUSTRIAL APPLICABILITY The present invention can be applied to a method for modifying a biological treatment apparatus. For example, a biological treatment apparatus in which a large screen is attached to one side surface of a biological reaction tank can be modified into a biological treatment apparatus having a configuration similar to that of the present embodiment. Modification work can be carried out according to the following procedure. First, the large screen is removed and the first sidewall 13 is provided. A partition wall 18 is provided inside the bioreactor, and a carrier trapping device 26 including a small screen 27 of the present embodiment is provided at the top portion 13A of the first side wall 13 . From the viewpoint of workability, the partition wall 18 is preferably made of a metal plate.

本発明のいくつかの好ましい実施形態を詳細に示し、説明したが、添付された請求項の趣旨または範囲から逸脱せずに様々な変更および修正が可能であることを理解されたい。 While several preferred embodiments of the invention have been shown and described in detail, it will be appreciated that various changes and modifications can be made without departing from the spirit or scope of the appended claims.

本発明の一実施形態に係る水処理システムの断面図である。1 is a cross-sectional view of a water treatment system according to one embodiment of the present invention; FIG. 図１に示す水処理システムにおける生物処理装置の部分斜視図である。FIG. 2 is a partial perspective view of a biological treatment device in the water treatment system shown in FIG. 1; 図２に示す生物処理装置の部分断面図である。3 is a partial cross-sectional view of the biological treatment apparatus shown in FIG. 2; FIG. 図３のＡ－Ａ線に沿った生物処理装置の部分平面図である。4 is a partial plan view of the biological treatment device taken along line AA of FIG. 3; FIG. 図３のＢ部拡大図である。FIG. 4 is an enlarged view of a B portion in FIG. 3; スクリーンの部分斜視図である。FIG. 4 is a partial perspective view of the screen;

２ 生物処理装置
２Ａ 脱窒処理槽（第１の生物処理槽）
２Ｂ 好気処理槽（第２の生物処理槽）
１２ 底板
１３～１６第１～第４の側壁
１７ 天板
１８ 仕切り壁
１９ 第１の領域
２０ 第２の領域
２１ 連通部
２２ 供給部
２５ 流出部
２６ 担体捕捉装置
２７ スクリーン
３１ 洗浄装置
Ｃ 担体 2 biological treatment equipment 2A denitrification treatment tank (first biological treatment tank)
2B Aerobic treatment tank (second biological treatment tank)
12 bottom plate 13 to 16 first to fourth side walls 17 top plate 18 partition wall 19 first area 20 second area 21 communicating section 22 supply section 25 outflow section 26 carrier capture device 27 screen 31 cleaning device C carrier

Claims (10)

被処理水を生物処理するための微生物が固定された担体が流動する生物反応槽と、
前記生物反応槽に設けられ、前記生物反応槽を、前記被処理水の供給部を含む第１の領域と、前記生物反応槽の下部で前記第１の領域と連通し、上部のみに前記生物反応槽で処理された処理水の流出部が形成された第２の領域と、に分離する仕切り壁と、
前記流出部に設けられたスクリーンを備え、前記スクリーンは前記担体の前記生物反応槽からの流出を防止する担体捕捉装置と、を有する、生物処理装置。 a biological reaction tank in which a carrier on which microorganisms are immobilized for biological treatment of water to be treated flows;
provided in the biological reaction tank, the biological reaction tank is communicated with a first region including the supply part of the water to be treated, a lower part of the biological reaction tank is in communication with the first region, and only an upper part of the biological reaction tank is in communication with the first region; a partition wall separating a second region in which an outflow part of the treated water treated in the reaction tank is formed;
A biological treatment apparatus comprising a screen provided in the outflow part, wherein the screen prevents the carrier from flowing out of the biological reaction tank. 前記生物反応槽は、前記仕切り壁と対向する第１の側壁を有し、前記第２の領域は前記仕切り壁と前記第１の側壁との間に形成され、前記処理水は前記第１の側壁を超えて前記生物反応槽を流出し、前記担体捕捉装置は前記第１の側壁の頂部に設けられている、請求項１に記載の生物処理装置。 The biological reaction tank has a first side wall facing the partition wall, the second region is formed between the partition wall and the first side wall, and the treated water 2. The biological treatment apparatus of claim 1, wherein said biological reactor flows over a side wall, said carrier capture device being located on top of said first side wall. 前記スクリーンは鉛直方向に対して傾斜している、請求項１または２に記載の生物処理装置。 3. A biological treatment apparatus according to claim 1 or 2, wherein said screen is inclined with respect to the vertical direction. 前記担体捕捉装置は、前記スクリーンの前記第２の領域の反対側に設けられ、前記スクリーンに洗浄用流体を噴射する洗浄装置を有する、請求項１から３のいずれか１項に記載の生物処理装置。 4. The biological treatment according to any one of claims 1 to 3, wherein the carrier capturing device has a cleaning device provided on the opposite side of the second area of the screen and configured to inject a cleaning fluid onto the screen. Device. 前記微生物は嫌気性細菌である、請求項１から４のいずれか１項に記載の生物処理装置。 The biological treatment apparatus according to any one of claims 1 to 4, wherein said microorganisms are anaerobic bacteria. 前記生物反応槽は前記第１の側壁の反対側に位置する第２の側壁を有し、前記供給部は前記第２の側壁の近傍に設けられ、前記供給部は前記生物反応槽に開口し前記被処理水を供給する供給口を有し、前記供給口は前記第２の側壁と対向している、請求項１から５のいずれか１項に記載の生物処理装置。 The bioreactor has a second side wall opposite the first side wall, the feed section is provided near the second side wall, and the feed section opens into the bioreactor. The biological treatment apparatus according to any one of claims 1 to 5, comprising a supply port for supplying said water to be treated, said supply port facing said second side wall. 被処理水を生物処理するための微生物が固定された担体が流動する生物反応槽と、
前記生物反応槽に設けられ、前記生物反応槽を、前記被処理水の供給部を含む第１の領域と、前記生物反応槽の下部で前記第１の領域と連通し、上部のみに前記生物反応槽で処理された処理水の流出部が形成された第２の領域と、に分離する仕切り壁と、を有する生物処理装置の担体捕捉装置であって、
前記流出部に設けられ、前記担体の前記生物反応槽からの流出を防止するスクリーンを備えた担体捕捉装置。 a biological reaction tank in which a carrier on which microorganisms are immobilized for biological treatment of water to be treated flows;
provided in the biological reaction tank, the biological reaction tank is communicated with a first region including the supply part of the water to be treated, a lower part of the biological reaction tank is in communication with the first region, and only an upper part of the biological reaction tank is in communication with the first region; A carrier capture device for a biological treatment device, comprising: a second region in which an outflow part of treated water treated in a reaction tank is formed; and a partition wall separating the second region,
A carrier trapping device provided at the outflow part and equipped with a screen for preventing the carrier from flowing out of the biological reaction tank. 前記スクリーンに洗浄用流体を噴射する洗浄装置を有する、請求項７に記載の担体捕捉装置。 8. A carrier capturing device according to claim 7, comprising a cleaning device for injecting a cleaning fluid onto said screen. 被処理水を生物処理するための微生物が固定された担体が流動する生物反応槽と、前記生物反応槽に設けられ、前記生物反応槽を、前記被処理水の供給部を含む第１の領域と、前記生物反応槽の下部で前記第１の領域と連通し、上部のみに前記生物反応槽で処理された処理水の流出部が形成された第２の領域と、に分離する仕切り壁と、を有する生物処理装置を用いた水処理方法であって、
前記第１の領域に被処理水を供給し、前記被処理水の一部を前記第２の領域に流入させることと、
前記第２の領域から前記流出部を通って流出する前記処理水を、前記流出部に設けられ、前記担体の前記生物反応槽からの流出を防止するスクリーンに通すことと、を有する、水処理方法。 a biological reaction tank in which a carrier on which microorganisms are immobilized for biological treatment of water to be treated flows; and a partition wall that separates the bioreactor into a second area that communicates with the first area in the lower part of the biological reaction tank and that has an outflow part for the treated water treated in the biological reaction tank only in the upper part. A water treatment method using a biological treatment device having
supplying the water to be treated to the first region and causing part of the water to be treated to flow into the second region;
passing the treated water flowing out of the second region through the outflow through a screen provided in the outflow to prevent the carrier from flowing out of the bioreactor. Method. 被処理水を生物処理するための微生物が固定された担体が流動する生物反応槽を備えた生物処理装置の改造方法であって、
前記生物反応槽に、前記生物反応槽を、前記被処理水の供給部を含む第１の領域と、前記生物反応槽の下部で前記第１の領域と連通し、上部のみに前記生物反応槽で処理された処理水の流出部が形成された第２の領域と、に分離する仕切り壁を設けることと、
前記流出部に設けられ前記担体の前記生物反応槽からの流出を防止するスクリーンを有する担体捕捉装置を設けることを有する、生物処理装置の改造方法。 A method for remodeling a biological treatment apparatus having a biological reaction tank in which a carrier on which microorganisms are immobilized for biological treatment of water to be treated flows, comprising:
The biological reactor is provided with a first region including the supply part of the water to be treated, a lower portion of the biological reactor communicating with the first region, and only an upper portion of the biological reactor. providing a partition wall separating a second region in which an outflow portion of the treated water treated in is formed;
A method for remodeling a biological treatment apparatus, comprising providing a carrier capture device having a screen provided at the outflow portion to prevent the carrier from flowing out of the biological reaction tank.
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