JP6489507B2 - Sewage treatment equipment - Google Patents

Sewage treatment equipment Download PDF

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JP6489507B2
JP6489507B2 JP2016017150A JP2016017150A JP6489507B2 JP 6489507 B2 JP6489507 B2 JP 6489507B2 JP 2016017150 A JP2016017150 A JP 2016017150A JP 2016017150 A JP2016017150 A JP 2016017150A JP 6489507 B2 JP6489507 B2 JP 6489507B2
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carrier
biological reaction
reaction tank
tank
sewage treatment
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智典 岩瀬
智典 岩瀬
圭 馬場
圭 馬場
順 青木
順 青木
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JFE Engineering 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
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    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Description

本発明は、微生物を付着させてなる微生物固定化担体によって汚水を処理する担体投入型汚水処理装置に関する。
なお、本発明においては「担体」という用語は微生物を担体に付着させてなる「微生物固定化担体」を意味するものとして用いる。 The present invention relates to a carrier-feeding sewage treatment apparatus for treating sewage with a microorganism-immobilized carrier to which microorganisms are attached.
In the present invention, the term “carrier” is used to mean a “microorganism-immobilized carrier” obtained by attaching a microorganism to a carrier.

担体を生物反応槽内に投入することにより生物反応槽内に微生物を保持させる担体投入型汚水処理装置は、標準活性汚泥法による汚水処理装置と比較して、処理の高速化あるいは処理設備のコンパクト化を図ることができるという利点がある。一方で、担体投入型汚水処理装置では、担体が生物反応槽外に流出するのを防止する必要がある。
そこで、担体が生物反応槽外に流出するのを防止するために、一般的には生物反応槽内の処理水流出側に担体分離装置（スクリーン）を設置することが行われている。 Compared with the sewage treatment equipment using the standard activated sludge method, the support-feeding sewage treatment equipment that retains microorganisms in the biological reaction tank by putting the carrier into the biological reaction tank is faster and more compact in the treatment equipment. There is an advantage that it can be realized. On the other hand, in the carrier input type sewage treatment apparatus, it is necessary to prevent the carrier from flowing out of the biological reaction tank.
Therefore, in order to prevent the carrier from flowing out of the biological reaction tank, a carrier separation device (screen) is generally installed on the treated water outflow side in the biological reaction tank.

特許文献１に記載の汚水処理装置を図８に示す。図８（ａ）は汚水処理装置を示し、図８（ｂ）はその要部を示す。
図８（ａ）に示した汚水処理装置は、生物反応槽１０に担体Ｓを投入して汚水Ｗを処理する汚水処理装置であり、生物反応槽１０には、汚水Ｗが投入され、さらに、担体Ｓが投入されている。生物反応槽１０に投入された汚水Ｗは、生物反応槽１０の底部に設けられた散気装置５から散気される空気等によって撹拌されており、生物反応槽１０は曝気槽を形成している。生物反応槽１０に投入された汚水Ｗは、担体Ｓによって、汚水Ｗ中に混入する有機物等を分解する微生物が育成されている。汚水Ｗは、生物反応槽１０内に所定時間滞留して、生物学的な処理がなされ、処理水Ｗｐは、担体分離用スクリーン３とバッフル板４とを通過して、越流部７から排出される。前記バッフル板４は、スクリーン３と越流部７との間に配置されてスクリーン３における処理水Ｗｐの流水速度Ｖを調整するものである。 The sewage treatment apparatus described in Patent Literature 1 is shown in FIG. Fig.8 (a) shows a sewage treatment apparatus, FIG.8 (b) shows the principal part.
The sewage treatment apparatus shown in FIG. 8 (a) is a sewage treatment apparatus that throws the carrier S into the biological reaction tank 10 to treat the sewage W. The biological reaction tank 10 is filled with sewage W, Carrier S is charged. The sewage W introduced into the biological reaction tank 10 is agitated by air or the like diffused from the air diffuser 5 provided at the bottom of the biological reaction tank 10, and the biological reaction tank 10 forms an aeration tank. Yes. In the sewage W introduced into the biological reaction tank 10, microorganisms that decompose organic substances and the like mixed in the sewage W are grown by the carrier S. The sewage W stays in the biological reaction tank 10 for a predetermined time and is biologically treated. The treated water Wp passes through the carrier separation screen 3 and the baffle plate 4 and is discharged from the overflow section 7. Is done. The baffle plate 4 is disposed between the screen 3 and the overflow section 7 and adjusts the flow velocity V of the treated water Wp in the screen 3.

この装置によれば、生物反応槽１０の槽壁上部に形成されている越流部７を流れる処理水Ｗｐは、水面において最も通水速度が速くなるが、生物反応槽１０のスクリーン３と越流部７との間に設けられたバッフル板４は、その流速が最も速い部分の流速を抑制して、スクリーン３を通過する処理水Ｗｐの流速Ｖを平均化するようにしており、処理水Ｗｐの流速によって、担体Ｓがスクリーン３の前面に押し付けられ、スクリーン３に目詰まりが発生するのを防止する   According to this apparatus, the treated water Wp flowing through the overflow section 7 formed at the upper part of the tank wall of the biological reaction tank 10 has the highest water flow rate on the surface of the water, but the screen 3 of the biological reaction tank 10 is overflowed. The baffle plate 4 provided between the flow portion 7 suppresses the flow velocity of the portion where the flow velocity is the fastest, and averages the flow velocity V of the treated water Wp passing through the screen 3. The carrier S is pressed against the front surface of the screen 3 by the flow rate of Wp, thereby preventing the screen 3 from being clogged.

ところで、担体投入型汚水処理装置においては、図９に示すような生物反応槽１０の槽幅Ｄ１が槽長さＤ２よりも長い躯体形状を有し、長辺側の槽壁の内側上部の角及び内側下部の角にハンチ１１が設けられている生物反応槽１０が用いられる場合がある。このような駆体形状を有する生物反応槽１０においては、図１０に示すように生物反応槽１０の底部に設けられた散気装置５による曝気によって旋回流Ｆが発生することがある。この場合、担体Ｓは発生した旋回流Ｆにより槽底部から槽上部へ集積するとともに、汚水の流れによってスクリーン３の前面上部に偏在する。その結果、スクリーン３の前面に偏在する担体Ｓが汚水の流れによりスクリーン面に押し付けられ、スクリーン３に目詰まりが発生し、槽内水位が上昇する要因となる。   By the way, in the carrier-feeding sewage treatment apparatus, the tank width D1 of the biological reaction tank 10 as shown in FIG. 9 has a casing shape longer than the tank length D2, and the corner on the inner upper side of the tank wall on the long side. And the biological reaction tank 10 in which the haunch 11 is provided in the corner | angular of an inner lower part may be used. In the biological reaction tank 10 having such a precursor shape, a swirling flow F may be generated by aeration by the air diffuser 5 provided at the bottom of the biological reaction tank 10 as shown in FIG. In this case, the carrier S accumulates from the bottom of the tank to the top of the tank by the generated swirling flow F, and is unevenly distributed on the front upper surface of the screen 3 by the flow of sewage. As a result, the carrier S unevenly distributed on the front surface of the screen 3 is pressed against the screen surface by the flow of dirty water, the screen 3 is clogged, and the water level in the tank rises.

特開２００１−４７０７３号公報JP 2001-47073 A

本発明は、安価かつ容易に、担体分離装置（スクリーン）の閉塞を抑制して安定した処理能力を得ることができる担体投入型汚水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 carrier input type sewage treatment apparatus that can obtain a stable treatment capacity by suppressing blockage of a carrier separation apparatus (screen) inexpensively and easily.

本発明は以下に記載する通りの担体投入型汚水処理装置に係るものである。
（１）担体を用いて生物処理を行う生物反応槽を備えた担体投入型汚水処理装置であって、
前記生物反応槽は槽幅が槽長さよりも長い躯体形状を有し、長辺側の槽壁の内側上部の角及び内側下部の角にハンチが設けられており、
前記生物反応槽の底部には散気装置が設けられており、
前記生物反応槽内の下流側には槽内を上流側と下流側とに仕切るように担体分離スクリーンが立設されており、
前記担体分離スクリーンの上流側にバッフル板が立設されていることを特徴とする担体投入型汚水処理装置。
（２）前記担体分離スクリーンに近接して、担体分離スクリーンに付着する担体を剥離させるための散気装置又は液体噴射装置を設けたことを特徴とする上記（１）に記載の担体投入型汚水処理装置。
（３）前記バッフル板が、担体分離スクリーンと平行に配置されているか、又は、担体分離スクリーンとバッフル板との間隔が上方に向かって広くなるように傾斜して配置されていることを特徴とする上記（１）又は（２）に記載の担体投入型汚水処理装置。 The present invention relates to a carrier input sewage treatment apparatus as described below.
(1) A carrier-feeding sewage treatment apparatus including a biological reaction tank that performs biological treatment using a carrier,
The biological reaction tank has a box shape in which the tank width is longer than the tank length, and a haunch is provided at an inner upper corner and an inner lower corner of the long side tank wall,
A diffuser is provided at the bottom of the biological reaction tank,
A carrier separation screen is erected on the downstream side in the biological reaction tank so as to partition the inside of the tank into an upstream side and a downstream side ,
A carrier-feeding sewage treatment apparatus, wherein a baffle plate is erected on the upstream side of the carrier separation screen .
(2) The carrier-filled sewage as described in (1) above, wherein an aeration device or a liquid ejecting device for separating the carrier adhering to the carrier separation screen is provided in the vicinity of the carrier separation screen. Processing equipment.
(3) the baffle plate, or are arranged parallel to the carrier separation screen, or a feature that the distance between the carrier separation screen and the baffle plate is arranged inclined to become wider upward The carrier input type sewage treatment apparatus according to (1) or (2).

本発明の担体投入型汚水処理装置を用いることにより、安価かつ容易に担体分離装置の閉塞を抑制することができ、汚水を安定して処理することができる。   By using the carrier input type sewage treatment apparatus of the present invention, the clogging of the carrier separation apparatus can be suppressed inexpensively and easily, and sewage can be treated stably.

本発明の担体投入型汚水処理装置における生物反応槽の例を示す断面図である。It is sectional drawing which shows the example of the biological reaction tank in the support | carrier insertion type sewage treatment apparatus of this invention. 図１に示した生物反応槽内の処理水の流れを示す図である。It is a figure which shows the flow of the treated water in the biological reaction tank shown in FIG. 図１に示した生物反応槽の縦断面及び横断面を示す図である。It is a figure which shows the longitudinal cross-section and cross section of the biological reaction tank shown in FIG. 本発明の担体投入型汚水処理装置における生物反応槽の一例を模式的に示す断面図である。It is sectional drawing which shows typically an example of the bioreaction tank in the support | carrier insertion type sewage treatment apparatus of this invention. 本発明の担体投入型汚水処理装置における生物反応槽の例を示す断面図である。It is sectional drawing which shows the example of the biological reaction tank in the support | carrier insertion type sewage treatment apparatus of this invention. 図１に示した生物反応槽の複数個を多段に配置した例を示す図である。It is a figure which shows the example which has arrange | positioned the biological reaction tank shown in FIG. 1 in multiple stages. 図７（ａ）は生物反応槽の平面図であり、図７（ｂ）は生物反応槽内の担体の濃度分布を示す図である。FIG. 7A is a plan view of the biological reaction tank, and FIG. 7B is a diagram showing the concentration distribution of the carrier in the biological reaction tank. 従来の担体投入型汚水処理装置における生物反応槽の例を示す図である。It is a figure which shows the example of the bioreaction tank in the conventional support | carrier insertion type sewage treatment apparatus. 従来の担体投入型汚水処理装置における生物反応槽の例を示す図である。It is a figure which shows the example of the bioreaction tank in the conventional support | carrier insertion type sewage treatment apparatus. 図９に示した生物反応槽内の処理水の流れを示す図である。It is a figure which shows the flow of the treated water in the biological reaction tank shown in FIG.

本発明の汚水処理装置の構成を図１に基づいて説明する。
本発明の汚水処理装置は、担体Ｓを用いて生物処理を行う生物反応槽１０を備えた担体投入型汚水処理装置である。本発明における生物反応槽１０は図９に示されるような、槽幅Ｄ１が槽長さＤ２よりも長い躯体形状を有し、長辺側の槽壁の内側上部の角及び内側下部の角にハンチ１１が設けられている。 The configuration of the sewage treatment apparatus of the present invention will be described with reference to FIG.
The sewage treatment apparatus of the present invention is a carrier input sewage treatment apparatus including a biological reaction tank 10 that performs biological treatment using a carrier S. As shown in FIG. 9, the biological reaction tank 10 in the present invention has a box shape in which the tank width D1 is longer than the tank length D2, and is formed at the corners of the inner upper part and the inner lower part of the tank wall on the long side. A haunch 11 is provided.

そして、前記生物反応槽１０内においては、下流側に担体分離装置３が設けられており、この担体分離装置３の上流側に該担体分離装置３に近接してバッフル板４が立設されている。
汚水流入部１から流入した汚水Ｗは生物反応槽１０内で担体Ｓと接触することによって生物処理され担体分離装置３によって担体Ｓを分離されて処理水流出部２から排出される。
既に図９に基づいて述べたように、バッフル板４を設置しない場合には、生物反応槽１０の底部に設けられた散気装置５による曝気によって旋回流Ｆが発生する。この旋回流Ｆは担体分離装置３の前面まで到達し、担体分離装置３の前面の上方部分における担体Ｓの存在密度が増加し、担体分離装置３の前面上部において担体Ｓが偏在するため、目詰まりが発生して安定した汚水処理ができない。 In the biological reaction tank 10, a carrier separation device 3 is provided on the downstream side, and a baffle plate 4 is erected in the vicinity of the carrier separation device 3 on the upstream side of the carrier separation device 3. Yes.
The sewage W flowing from the sewage inflow part 1 is biologically treated by contacting the carrier S in the biological reaction tank 10, the carrier S is separated by the carrier separation device 3, and discharged from the treated water outflow part 2.
As already described with reference to FIG. 9, when the baffle plate 4 is not installed, a swirling flow F is generated by aeration by the aeration device 5 provided at the bottom of the biological reaction tank 10. This swirling flow F reaches the front surface of the carrier separation device 3, the density of the carrier S in the upper part of the front surface of the carrier separation device 3 increases, and the carrier S is unevenly distributed in the upper part of the front surface of the carrier separation device 3. Clogging occurs and stable sewage treatment is not possible.

これに対し、担体分離装置３の上流側にバッフル板４を設けた場合には、図２に示すように、生物反応槽１０に供給された汚水Ｗはバッフル板４までの槽内空間で旋回流Ｆを形成する。そして、図２のＸで示した領域におけるバッフル板４と担体分離装置３との間の空間には処理水の一部が流入して良好な上向流を形成するため、担体分離装置３の前面側では担体Ｓが偏在することがなく、目詰まりが発生しないため安定した汚水処理が可能となる。   On the other hand, when the baffle plate 4 is provided on the upstream side of the carrier separation device 3, the sewage W supplied to the biological reaction tank 10 swirls in the tank space up to the baffle plate 4 as shown in FIG. A flow F is formed. Then, a part of the treated water flows into the space between the baffle plate 4 and the carrier separation device 3 in the region indicated by X in FIG. Since the carrier S is not unevenly distributed on the front side and clogging does not occur, stable sewage treatment is possible.

生物反応槽１０内におけるバッフル板４の配置の仕方を図３に示す。
図３（ａ）は生物反応槽１０の縦断面図であり、図３（ｂ）は生物反応槽１０の横断面図である。
図３（ａ）に示すように、バッフル板４は担体分離装置３の前面に間隔Ａをおいて配置されている。
図３（ａ）において、生物反応槽１０の水位はＨであり、バッフル板４の縦方向長さは水位Ｈの高さよりも短く、水面１３とバッフル板４の上端との間には間隔Ｂが設けられており、槽底面１２とバッフル板４の下端との間には間隔Ｃが設けられている。
また、図３（ｂ）に示すように、バッフル板４の横方向長さは生物反応槽１０の槽幅Ｄ１と同じである。 FIG. 3 shows how the baffle plate 4 is arranged in the biological reaction tank 10.
FIG. 3A is a longitudinal sectional view of the biological reaction tank 10, and FIG. 3B is a transverse sectional view of the biological reaction tank 10.
As shown in FIG. 3 (a), the baffle plate 4 is arranged at a distance A on the front surface of the carrier separation device 3.
In FIG. 3A, the water level of the biological reaction tank 10 is H, the vertical length of the baffle plate 4 is shorter than the height of the water level H, and there is a gap B between the water surface 13 and the upper end of the baffle plate 4. A space C is provided between the tank bottom surface 12 and the lower end of the baffle plate 4.
Moreover, as shown in FIG. 3B, the lateral length of the baffle plate 4 is the same as the tank width D <b> 1 of the biological reaction tank 10.

前記のＡ、Ｂ及びＣの寸法は生物反応槽１０の大きさによって適宜選択することができるが、バッフル板４として高さ２４００ｍｍ程度のものを使用する生物反応槽１０においては下記の寸法を例示することができる。   The dimensions of A, B, and C can be appropriately selected depending on the size of the biological reaction tank 10, but the following dimensions are exemplified in the biological reaction tank 10 using a baffle plate 4 having a height of about 2400 mm. can do.

Figure 0006489507
Figure 0006489507

図３ではバッフル板４を担体分離装置３と平行に配置した例を示したが、バッフル板４を図４に示すようにバッフル板４と担体分離装置３との間の間隔が上方に向かって広くなるように傾斜させて配置しても良い。   Although FIG. 3 shows an example in which the baffle plate 4 is arranged in parallel with the carrier separating device 3, the distance between the baffle plate 4 and the carrier separating device 3 is upward as shown in FIG. You may incline and arrange so that it may become wide.

また、担体分離装置３に担体Ｓが付着して目詰まりが生じることを防ぐために、担体分離装置３の前面に専用の散気装置又は液体噴射装置を設けてもよい。
図５に担体分離装置３の前面に散気装置６を設けた例を示す。
散気装置６から連続的又は間欠的に噴出されるガスは担体Ｓを攪乱して担体Ｓによる目詰まりを防ぐことができる。
図５には散気装置６を担体分離装置３の前面に設けた例を示したが、散気装置６は担体分離装置３の後面に設けても良く、また、担体分離装置３の前面及び後面に設けても良い。
また、散気装置６に代えて液体噴射装置を設けることによっても同様に目詰まりを防ぐ効果を得ることができる。 In order to prevent the carrier S from adhering to the carrier separation device 3 and causing clogging, a dedicated air diffuser or liquid ejecting device may be provided on the front surface of the carrier separation device 3.
FIG. 5 shows an example in which an air diffuser 6 is provided on the front surface of the carrier separator 3.
The gas ejected continuously or intermittently from the air diffuser 6 can disturb the carrier S and prevent clogging by the carrier S.
FIG. 5 shows an example in which the air diffuser 6 is provided on the front surface of the carrier separator 3, but the air diffuser 6 may be provided on the rear surface of the carrier separator 3, It may be provided on the rear surface.
In addition, an effect of preventing clogging can be obtained by providing a liquid ejecting apparatus instead of the air diffuser 6.

また、汚水処理システムにおいては、複数の生物反応槽を上流側から下流側に直列に接続して配置する場合がある。
図６に本発明において用いる生物反応槽である、第１生物反応槽２１、第２生物反応槽２２及び第３生物反応槽２３を直列に配置した例を示す。 In the sewage treatment system, a plurality of biological reaction tanks are sometimes connected in series from the upstream side to the downstream side.
FIG. 6 shows an example in which a first biological reaction tank 21, a second biological reaction tank 22, and a third biological reaction tank 23, which are biological reaction tanks used in the present invention, are arranged in series.

図７に示す生物反応槽１０において担体分離装置３の前面側における担体濃度（真容積の体積％）を測定した。図７（ａ）は生物反応槽の平面図であり、図７（ｂ）は生物反応槽の断面図である。図中●は担体濃度の測定箇所を示す。なお、この生物反応槽１０における上記Ａ、Ｂ及びＣの寸法は、以下の通りである。
Ａ：５００ｍｍ、Ｂ：１０００ｍｍ、Ｃ：１０００ｍｍ。
図７（ｂ）に示すように、担体分離装置３の上流側にバッフル板４を立設することにより、担体分離装置３の前面の担体濃度は槽内全体の担体濃度と同程度のものとなった。
なお、担体分離装置３の前面下部で担体濃度が槽全体の担体濃度よりも高い数値を示しているがこれは上方に行くに従って均等化される結果となっており、担体濃度は担体分離装置３の前面において上方に向かって増大することはなく、バッフル板４が担体Ｓの集積防止の効果を奏していることがわかる。
なお、併せてバッフル板を設けないで行った場合には、担体分離装置３の前面における担体濃度は槽内全体より増大し、かつ担体分離装置３の下方から上方へ向かって増大した。 In the biological reaction tank 10 shown in FIG. 7, the carrier concentration (volume% of the true volume) on the front side of the carrier separator 3 was measured. FIG. 7A is a plan view of the biological reaction tank, and FIG. 7B is a cross-sectional view of the biological reaction tank. In the figure, ● indicates the measurement point of the carrier concentration. In addition, the dimension of said A, B, and C in this biological reaction tank 10 is as follows.
A: 500 mm, B: 1000 mm, C: 1000 mm.
As shown in FIG. 7 (b), by setting up a baffle plate 4 on the upstream side of the carrier separation device 3, the carrier concentration on the front surface of the carrier separation device 3 is approximately the same as the carrier concentration in the entire tank. became.
The carrier concentration is higher in the lower part of the front surface of the carrier separation device 3 than the carrier concentration in the entire tank, but this is a result of equalization as it goes upward. The carrier concentration is equal to the carrier separation device 3. It can be seen that the baffle plate 4 has an effect of preventing the accumulation of the carrier S.
In addition, when it carried out without providing a baffle plate, the carrier concentration at the front surface of the carrier separation device 3 increased from the entire inside of the tank, and increased from the lower side to the upper side of the carrier separation device 3.

１ 汚水流入部
２ 処理水流出部
３ 担体分離装置、スクリーン
４ バッフル板
５、６ 散気装置
７ 越流部
８ 気泡
１０ 生物反応槽
１１ ハンチ
１２ 槽底面
１３ 水面
２１ 第１生物反応槽
２２ 第２生物反応槽
２３ 第３生物反応槽
Ｄ１ 槽幅
Ｄ２ 槽長さ
Ｆ 旋回流
Ｌ１ 生物反応槽の水位
Ｌ２ 処理水の流出流路の水位
Ｓ 担体
Ｖ 流速
Ｗ 汚水
Ｗｐ 処理水 DESCRIPTION OF SYMBOLS 1 Wastewater inflow part 2 Treated water outflow part 3 Carrier separation apparatus, screen 4 Baffle plate 5, 6 Air diffuser 7 Overflow part 8 Bubble 10 Bioreaction tank 11 Haunch 12 Tank bottom face 13 Water surface 21 First bioreaction tank 22 2nd Biological reaction tank 23 Third biological reaction tank D1 Tank width D2 Tank length F Swirling flow L1 Water level L2 of biological reaction tank Water level of outflow channel of treated water S Carrier V Flow velocity W Sewage Wp Treated water

Claims (3)

担体を用いて生物処理を行う生物反応槽を備えた担体投入型汚水処理装置であって、
前記生物反応槽は槽幅が槽長さよりも長い躯体形状を有し、長辺側の槽壁の内側上部の角及び内側下部の角にハンチが設けられており、
前記生物反応槽の底部には散気装置が設けられており、
前記生物反応槽内の下流側には槽内を上流側と下流側とに仕切るように担体分離スクリーンが立設されており、
前記担体分離スクリーンの上流側にバッフル板が立設されていることを特徴とする担体投入型汚水処理装置。 A carrier input type sewage treatment apparatus equipped with a biological reaction tank that performs biological treatment using a carrier,
The biological reaction tank has a box shape in which the tank width is longer than the tank length, and a haunch is provided at an inner upper corner and an inner lower corner of the long side tank wall,
A diffuser is provided at the bottom of the biological reaction tank,
A carrier separation screen is erected on the downstream side in the biological reaction tank so as to partition the inside of the tank into an upstream side and a downstream side ,
A carrier-feeding sewage treatment apparatus, wherein a baffle plate is erected on the upstream side of the carrier separation screen . 前記担体分離スクリーンに近接して、担体分離スクリーンに付着する担体を剥離させるための散気装置又は液体噴射装置を設けたことを特徴とする請求項１に記載の担体投入型汚水処理装置。 2. The carrier input type sewage treatment apparatus according to claim 1, further comprising an air diffuser or a liquid ejecting device for separating the carrier attached to the carrier separation screen in the vicinity of the carrier separation screen . 前記バッフル板が、担体分離スクリーンと平行に配置されているか、又は、担体分離スクリーンとバッフル板との間隔が上方に向かって広くなるように傾斜して配置されていることを特徴とする請求項１又は２に記載の担体投入型汚水処理装置。 Claims wherein the baffle plate, or are arranged parallel to the carrier separation screen, or, characterized in that the distance between the carrier separation screen and the baffle plate is arranged inclined to become wider upward The carrier input type sewage treatment apparatus according to 1 or 2.
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