JP2016179438A - Carrier charging type sewage treatment apparatus - Google Patents

Carrier charging type sewage treatment apparatus Download PDF

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JP2016179438A
JP2016179438A JP2015060750A JP2015060750A JP2016179438A JP 2016179438 A JP2016179438 A JP 2016179438A JP 2015060750 A JP2015060750 A JP 2015060750A JP 2015060750 A JP2015060750 A JP 2015060750A JP 2016179438 A JP2016179438 A JP 2016179438A
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biological reaction
reaction tank
treated water
sewage
carrier
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JP6394977B2 (en
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智典 岩瀬
Tomonori Iwase
智典 岩瀬
圭 馬場
Kei Baba
圭 馬場
順 青木
Jun Aoki
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
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Abstract

PROBLEM TO BE SOLVED: To provide a carrier charging type sewage treatment apparatus not causing clogging of a carrier separator with carriers.SOLUTION: In a carrier charging type sewage treatment apparatus, a biological reaction tank is partitioned lengthwise into a plurality of biological reaction tanks by partition walls, a treated water space having an erected baffle plate is provided between a carrier separator and a partition wall downstream of the biological reaction tank, a first divided flow is supplied to a first biological reaction tank, each biological reaction tank other than the first biological reaction tank and a sewage distribution mechanism are communicated with each other by a sewage supply duct, a treated water space of each biological reaction tank other than a downstream end-side biological reaction tank and a treated water space of the downstream end-side biological reaction tank are communicated with each other by a treated water discharge duct, a sewage supply duct introducing an n-th divided flow penetrates from a first partition wall to an (n-1)-th partition wall and opens upstream of an n-th biological reaction tank, and a treated water discharge duct discharging treated water from the n-th biological reaction tank opens in a treated water space of the n-th biological reaction tank and penetrates from an n-th partition wall to a final partition wall to open in the treated water space of the downstream end-side biological reaction tank.SELECTED DRAWING: Figure 5

Description

本発明は、微生物を付着させた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。   The present invention relates to a carrier input type sewage treatment apparatus for treating sewage with a carrier to which microorganisms are attached.

従来の活性汚泥処理法を適用した汚水処理装置として、微生物を付着させた担体を生物反応槽内に投入して汚水処理を行う担体投入型汚水処理装置は知られている（例えば、特許文献１参照）。   As a sewage treatment apparatus to which a conventional activated sludge treatment method is applied, a carrier input type sewage treatment apparatus that performs sewage treatment by introducing a carrier with microorganisms attached into a biological reaction tank is known (for example, Patent Document 1). reference).

また、特許文献２には、雨天時等に設計値以上の水量が処理場に流入した場合に、担体と生物反応槽混合液を分離する担体分離板の閉塞を回避することができるようにした担体投入型生物反応装置が記載されている。
特許文献２に記載の装置を図６に示す。この装置は、微生物を付着させた担体Ｓを用いて流入水の生物処理を行う生物反応槽３１と、この生物反応槽３１内に配設され、生物反応槽３１内の混合液から前記担体Ｓを捕捉分離する担体分離装置（担体分離板）３２と、生物反応槽３１の流下方向に沿って設置され、流入水を移送する移送管３３とを備えている。この移送管３３には、上流側から流入口３５、流入調整具３６、下流側流入口３４が設けられている。 Further, in Patent Document 2, when the amount of water more than the design value flows into the treatment plant during rainy weather or the like, it is possible to avoid clogging of the carrier separation plate that separates the carrier and the biological reaction tank mixture. A carrier input bioreactor is described.
The device described in Patent Document 2 is shown in FIG. This apparatus includes a biological reaction tank 31 that performs biological treatment of influent water using a carrier S to which microorganisms are attached, and a biological reaction tank 31 that is disposed in the biological reaction tank 31. Is provided along a flow-down direction of the biological reaction tank 31 and a transfer pipe 33 that transfers inflow water. The transfer pipe 33 is provided with an inlet 35, an inflow adjuster 36, and a downstream inlet 34 from the upstream side.

この装置においては、通常時は流入水が移送管３３上流側の流入口３５から生物反応槽３１内に流入する。また、過剰流入水が流入したときは、その過剰流入水が流入調整具３６のゲートを超えて下流側流入口３４から担体分離装置３２の下流側に分配流入される。このため、担体分離板３２に生物反応槽３１の流入水量（設計水量）以上の水量負荷がかからず、担体Ｓが担体分離板３２付近の上流側に集中するようなことがなく、担体Ｓによる担体分離板３２の閉塞を回避することができる。   In this apparatus, inflow water normally flows into the biological reaction tank 31 from the inlet 35 upstream of the transfer pipe 33. Further, when excessive inflow water flows in, the excessive inflow water passes through the gate of the inflow adjuster 36 and is distributed and introduced from the downstream inflow port 34 to the downstream side of the carrier separation device 32. For this reason, the carrier separation plate 32 is not loaded with a water amount greater than the amount of inflow water (designed water amount) of the biological reaction tank 31, and the carrier S is not concentrated upstream in the vicinity of the carrier separation plate 32. The blockage of the carrier separation plate 32 due to the above can be avoided.

しかしながら、図６に示した装置では、生物反応槽３１の末端に担体分離板を設置しているため、槽内断面流速が大きくなると、担体が担体分離装置側に偏り、ある一定の槽内断面流速に達すると担体分離装置が閉塞する恐れがある。   However, in the apparatus shown in FIG. 6, since the carrier separation plate is installed at the end of the biological reaction tank 31, when the cross-sectional flow velocity in the tank increases, the carrier is biased toward the carrier separation apparatus, and a certain cross-section in the tank. When the flow rate is reached, the carrier separation device may be blocked.

特開昭５８−６７３９５号公報JP 58-67395 A 特開２０１０−１５５１８４号公報JP 2010-155184 A

本発明は生物反応槽内において担体が担体分離装置側に偏って担体分離装置が閉塞することのない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 in which a carrier is not biased toward the carrier separation device and the carrier separation device is not blocked in the biological reaction tank.

本発明者は、生物反応槽を仕切壁で複数槽に仕切り、それぞれの槽に担体分離装置を設け、流入水を分割して各槽に供給するとともに、担体分離装置を通過した処理水を各槽から排出することにより、上記課題を解決することができることを見いだして本発明を完成した。
すなわち、本発明の構成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。 The inventor divided a biological reaction tank into a plurality of tanks with partition walls, provided a carrier separation device in each tank, divided inflow water to be supplied to each tank, and treated water passed through the carrier separation device. The present invention has been completed by finding that the above-mentioned problems can be solved by discharging from the tank.
That is, the configuration of the present invention relates to a carrier input sewage treatment apparatus as described below.

（１）担体を用いて生物処理を行う生物反応槽と、前記生物反応槽に汚水を供給する汚水供給手段と、前記生物反応槽から処理水を排出する処理水排出手段とを備えた担体投入型汚水処理装置であって、
前記汚水供給手段は汚水を複数の分割流に分割する汚水分配機構を備えており、
前記生物反応槽は仕切壁によって長さ方向に複数個の生物反応槽に分割されており、
各生物反応槽のそれぞれには担体分離装置が設けられており、
担体分離装置と生物反応槽の下流側仕切壁又は下流側槽壁との間には処理水空間が設けられており、
第１番目の分割流は第１番目の生物反応槽に供給されるようになっており、
第１生物反応槽を除く各生物反応槽と前記汚水分配機構とは汚水供給ダクトによって連通するとともに、下流側端の生物反応槽を除く各生物反応槽の処理水空間と下流側端の生物反応槽の処理水空間とは処理水排出ダクトによって連通しており、
第ｎ番目（ｎ＝１を除く）の分割流を導く汚水供給ダクトは第１番目の仕切壁から第ｎ−１番目の仕切壁までを貫通してｎ番目の生物反応槽の上流側に開口しており、
第ｎ番目の生物反応槽からの処理水を排出する処理水排出ダクトは第ｎ番目の生物反応槽の処理水空間に開口すると共に、第ｎ番目の仕切壁から最後の仕切壁までを貫通して最後の生物反応槽の処理水空間に開口しており、
前記生物反応槽の処理水空間には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）担体を用いて生物処理を行う生物反応槽と、前記生物反応槽に汚水を供給する汚水供給手段と、前記生物反応槽から処理水を排出する処理水排出手段とを備えた担体投入型汚水処理装置であって、
前記汚水供給手段は汚水を２つの分割流に分割する汚水分配機構を備えており、
前記生物反応槽は仕切壁によって長さ方向に第１生物反応槽と第２生物反応槽とに分割されており、
第１生物反応槽及び第２生物反応槽にはそれぞれ第１担体分離装置及び第２担体分離装置が設けられており、
第１担体分離装置と仕切壁との間には第１処理水空間が設けられ、
第２担体分離装置と第２生物反応槽の下流側槽壁との間には第２処理水空間が設けられ、
第１の分割流は第１生物反応槽に供給されるようになっており、
第２の分割流を導く汚水供給ダクトが、その上流側端部が前記汚水分配機構に連通すると共に、その下流側端部が第２生物反応槽の上流側に開口するように仕切壁を貫通して設けられ、
第１生物反応槽からの処理水を排出する処理水排出ダクトが、その上流側端部が前記第１処理水空間に開口すると共に、その下流側端部が前記第２処理水空間に開口するように仕切壁を貫通して設けられ、
前記第１処理水空間及び第２処理水空間には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。
（３）前記汚水分配機構は、溢流堰と分配壁とを含み前記分配壁は溢流堰を越えた汚水を複数の分割流に分割する位置に設けられていることを特徴とする上記（１）または（２）に記載の担体投入型汚水処理装置。 (1) A carrier input provided with a biological reaction tank that performs biological treatment using a carrier, sewage supply means for supplying sewage to the biological reaction tank, and treated water discharge means for discharging treated water from the biological reaction tank Type wastewater treatment equipment,
The sewage supply means includes a sewage distribution mechanism that divides sewage into a plurality of divided flows,
The biological reaction tank is divided into a plurality of biological reaction tanks in the length direction by a partition wall;
Each biological reaction tank is provided with a carrier separation device,
A treated water space is provided between the carrier separator and the downstream partition wall or the downstream tank wall of the biological reaction tank,
The first split stream is fed to the first biological reactor,
Each biological reaction tank except the first biological reaction tank and the sewage distribution mechanism communicate with each other by a sewage supply duct, and the treated water space of each biological reaction tank except the biological reaction tank at the downstream end and the biological reaction at the downstream end. The treated water space of the tank communicates with the treated water discharge duct,
The sewage supply duct for guiding the nth (except for n = 1) divided flow passes through the first partition wall to the (n-1) th partition wall and opens upstream of the nth biological reaction tank. And
A treated water discharge duct for discharging treated water from the nth biological reaction tank opens into the treated water space of the nth biological reaction tank and penetrates from the nth partition wall to the last partition wall. Open to the treated water space of the last biological reaction tank,
A baffle plate is erected in the treated water space of the biological reaction tank.
(2) Feeding carrier comprising biological reaction tank for biological treatment using a carrier, sewage supply means for supplying sewage to the biological reaction tank, and treated water discharge means for discharging treated water from the biological reaction tank Type wastewater treatment equipment,
The sewage supply means includes a sewage distribution mechanism that divides sewage into two divided flows,
The biological reaction tank is divided into a first biological reaction tank and a second biological reaction tank in a longitudinal direction by a partition wall;
The first biological reaction tank and the second biological reaction tank are provided with a first carrier separation device and a second carrier separation device, respectively.
A first treated water space is provided between the first carrier separation device and the partition wall,
A second treated water space is provided between the second carrier separation device and the downstream tank wall of the second biological reaction tank,
The first split stream is supplied to the first biological reactor,
The sewage supply duct for guiding the second divided flow passes through the partition wall so that its upstream end communicates with the sewage distribution mechanism and its downstream end opens to the upstream side of the second biological reaction tank. Provided,
The treated water discharge duct for discharging treated water from the first biological reaction tank has an upstream end opened to the first treated water space and a downstream end opened to the second treated water space. Provided through the partition wall,
A baffle plate is provided upright in the first treated water space and the second treated water space.
(3) The sewage distribution mechanism includes an overflow dam and a distribution wall, and the distribution wall is provided at a position where the sewage exceeding the overflow dam is divided into a plurality of divided flows. 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は、生物反応槽内において担体が担体分離装置側に偏って担体分離装置が閉塞することがないため、安定した生物処理を行うことができる。   In the carrier input type sewage treatment apparatus of the present invention, the carrier is not biased toward the carrier separation device in the biological reaction tank and the carrier separation device is not clogged, so that stable biological treatment can be performed.

本発明の実施の形態による担体投入型汚水処理装置を模式的に示す断面図である。It is sectional drawing which shows typically the support | carrier insertion type sewage treatment apparatus by embodiment of this invention. 本発明の実施の形態による担体投入型汚水処理装置を示す概略的な斜視図である。1 is a schematic perspective view showing a carrier input sewage treatment apparatus according to an embodiment of the present invention. 図１のＸ部分を拡大して示した図である。It is the figure which expanded and showed the X part of FIG. 図１のＹ部分を拡大して示した図である。It is the figure which expanded and showed the Y part of FIG. 本発明の実施の形態による担体投入型汚水処理装置の汚水及び処理水の流れを説明するための模式図である。It is a schematic diagram for demonstrating the flow of the sewage of a carrier injection | throwing-in type sewage treatment apparatus by embodiment of this invention, and treated water. 従来の担体投入型汚水処理装置を示す図である。It is a figure which shows the conventional support | carrier insertion type sewage treatment apparatus.

担体が投入された生物反応槽において、担体分離スクリーン近傍の担体濃度が高くなると、担体がスクリーンに圧着されて通水抵抗が大きくなり、水の通過が阻害される。担体分離スクリーン近傍の担体濃度は生物反応槽の縦横比と断面流速とによって定まる。本発明者は、処理水の速度、生物反応槽の幅と長さとの比を考慮して、生物反応槽を２分割し、分割したそれぞれの生物反応槽に担体分離スクリーンを設けると共に、各生物反応槽に汚水を略均等に分配できる分配機構を設けることで、縦横比及び断面流速を小さくすることによって担体分離スクリーン近傍の担体濃度を低減させることができることを見出した。
そして、担体分離スクリーン近傍の担体濃度を低減させることにより、担体分離スクリーンの閉塞がなく、安定的に運転ができると共に、担体剥離のための散気空気量も低減することができた。 When the carrier concentration in the vicinity of the carrier separation screen is increased in the biological reaction tank in which the carrier is charged, the carrier is pressed against the screen, the water flow resistance is increased, and the passage of water is inhibited. The carrier concentration in the vicinity of the carrier separation screen is determined by the aspect ratio of the biological reaction tank and the cross-sectional flow velocity. The present inventor considered that the ratio of the speed of treated water and the width and length of the biological reaction tank was divided into two, and the biological reaction tank was divided into two, and a carrier separation screen was provided in each divided biological reaction tank. It has been found that the carrier concentration in the vicinity of the carrier separation screen can be reduced by reducing the aspect ratio and the cross-sectional flow velocity by providing a distribution mechanism capable of distributing sewage substantially evenly in the reaction tank.
Further, by reducing the carrier concentration in the vicinity of the carrier separation screen, the carrier separation screen is not clogged and can be operated stably, and the amount of air diffused for carrier separation can also be reduced.

また、流出ダクト付近における担体分離スクリーン部での局所流を防止するためにスクリーンとダクトとの間にバッフル板を設け、スクリーン流出側の局所流を低減することより、スクリーンへの担体の圧着を防止することができることを見出した。
そして、上記のように、担体分離スクリーン近傍の担体濃度を低減させ、スクリーン流出側の局所流を低減することにより、担体分離スクリーンの閉塞がなく、安定的に運転ができると共に、担体剥離のための散気空気量も低減することができた。 In addition, a baffle plate is provided between the screen and the duct in order to prevent local flow at the carrier separation screen near the outflow duct, and the local flow on the screen outflow side is reduced, so that the carrier is pressed onto the screen. It was found that it can be prevented.
As described above, by reducing the carrier concentration in the vicinity of the carrier separation screen and reducing the local flow on the screen outflow side, the carrier separation screen is not clogged and can be stably operated, and the carrier can be separated. The amount of air diffused was also reduced.

担体投入型汚水処理装置は基本的な構成として、担体を用いて生物処理を行う生物反応槽と、前記生物反応槽に汚水を供給する汚水供給手段と、前記生物反応槽から処理水を排出する処理水排出手段とを備えている。   The carrier input type sewage treatment apparatus basically includes a biological reaction tank that performs biological treatment using a carrier, sewage supply means that supplies sewage to the biological reaction tank, and discharges treated water from the biological reaction tank. Treated water discharge means.

本発明の担体投入型汚水処理装置は生物反応槽を長さ方向に複数の生物反応槽に分割すると共に、汚水を複数の分割流に分割して、それぞれの分割流を各生物反応槽において処理することを特徴としている。
以下では発明の理解を容易にするために生物反応槽を２つに分割した実施形態を例にとって説明する。
本発明の担体投入型汚水処理装置の実施の形態を図１に基づいて説明する。
担体投入型汚水処理装置は、生物反応槽（１Ａ、１Ｂ）と、汚水Ｗを生物反応槽（１Ａ、１Ｂ）に供給する汚水分配機構２と、処理水を生物反応槽から排出する処理水排出手段７とを備えている。
生物反応槽は仕切壁３によって容積が略等しい第１生物反応槽１Ａと第２生物反応槽１Ｂとに分割されている。 The carrier input type sewage treatment apparatus of the present invention divides a biological reaction tank into a plurality of biological reaction tanks in the lengthwise direction, divides sewage into a plurality of divided flows, and processes each divided flow in each biological reaction tank. It is characterized by doing.
In the following, an embodiment in which a biological reaction tank is divided into two parts will be described as an example in order to facilitate understanding of the invention.
An embodiment of the carrier input sewage treatment apparatus of the present invention will be described with reference to FIG.
The carrier input type sewage treatment apparatus includes a biological reaction tank (1A, 1B), a sewage distribution mechanism 2 for supplying sewage W to the biological reaction tank (1A, 1B), and a treated water discharge for discharging treated water from the biological reaction tank. Means 7 are provided.
The biological reaction tank is divided by the partition wall 3 into a first biological reaction tank 1A and a second biological reaction tank 1B having substantially the same volume.

第１生物反応槽１Ａの処理水の流れ方向の下流側末端付近には第１担体分離装置４Ａが設けられており、第１担体分離装置４Ａと仕切壁３との間には第１処理水空間５Ａが設けられている。
また、第２生物反応槽１Ｂの処理水の流れ方向の下流側末端付近には第２担体分離装置４Ｂが設けられており、第２担体分離装置４Ｂと第２生物反応槽１Ｂの下流側槽壁６との間には第２処理水空間５Ｂが設けられている。 A first carrier separation device 4A is provided in the vicinity of the downstream end in the flow direction of the treated water in the first biological reaction tank 1A, and the first treated water is provided between the first carrier separating device 4A and the partition wall 3. A space 5A is provided.
A second carrier separation device 4B is provided near the downstream end of the second biological reaction tank 1B in the direction of the treated water, and the second carrier separation device 4B and the downstream tank of the second biological reaction tank 1B. A second treated water space 5 </ b> B is provided between the wall 6.

第１生物反応槽１Ａの上流側端部に設けられた汚水分配機構２は、汚水Ｗを第１生物反応槽１Ａに流入する第１汚水ＷＡと、第２生物反応槽に流入する第２汚水ＷＢとに分配する構造を有している。
この汚水分配機構２の具体的な構造例を図２に基づいて説明する。
汚水分配機構２は溢流堰２１と、溢流堰２１を超えてきた汚水Ｗを、第１生物反応槽１Ａにおいて処理される第１汚水ＷＡと、第２生物反応槽１Ｂにおいて処理される第２汚水ＷＢとの２つの流れに分配する分配壁２２とを備えている。この分配壁２２は汚水Ｗを略等量に二分するような位置に設けられている。 The sewage distribution mechanism 2 provided at the upstream end of the first biological reaction tank 1A includes a first sewage WA that flows the sewage W into the first biological reaction tank 1A and a second sewage that flows into the second biological reaction tank. It has a structure for distributing to WB.
A specific structural example of the sewage distribution mechanism 2 will be described with reference to FIG.
The sewage distribution mechanism 2 includes an overflow weir 21 and a sewage W that has exceeded the overflow dam 21 in a first sewage WA that is treated in the first biological reaction tank 1A and in a second biological reaction tank 1B. The distribution wall 22 distributes the two flows of the two wastewater WB. The distribution wall 22 is provided at a position that divides the sewage W into approximately equal amounts.

分配壁２２は、溢流堰２１及び区画壁２３と共に第２汚水ＷＢを受け入れる区画室２０を形成しており、区画室２０に流入した第２汚水ＷＢは、区画室２０の底板２４に開口している流出口２５から汚水供給ダクト１０Ａ内に流入し、第２生物反応槽１Ｂに送られて担体Ｓと接触して処理される。
分配壁２２によって分配された第１汚水ＷＡはそのまま第１生物反応槽１Ａ内に流入して担体Ｓと接触して生物反応処理される。 The distribution wall 22 forms a compartment 20 that receives the second sewage WB together with the overflow weir 21 and the compartment wall 23, and the second sewage WB that has flowed into the compartment 20 opens into the bottom plate 24 of the compartment 20. It flows into the sewage supply duct 10A from the outlet 25, and is sent to the second biological reaction tank 1B to be processed in contact with the carrier S.
The first sewage WA distributed by the distribution wall 22 flows into the first biological reaction tank 1A as it is, contacts the carrier S, and is subjected to a biological reaction process.

次に汚水供給ダクト１０Ａ及び処理水排水ダクト１０Ｂについて説明する。
汚水供給ダクト１０Ａの上流側端部は汚水分配機構２の区画室の流出口２５に連通している。また、汚水供給ダクト１０Ａは第１生物反応槽１Ａ内を通って下流側に伸び、その下流側端部は仕切壁３の下方部に設けられた第２開口部１２Ａを貫通し、その下流側端部開口１１Ａは第２生物反応槽１Ｂの上流側で開口している。 Next, the sewage supply duct 10A and the treated water drainage duct 10B will be described.
The upstream end of the sewage supply duct 10 </ b> A communicates with the outlet 25 of the compartment of the sewage distribution mechanism 2. Further, the sewage supply duct 10 </ b> A extends downstream through the first biological reaction tank 1 </ b> A, and its downstream end penetrates through the second opening 12 </ b> A provided in the lower part of the partition wall 3, and downstream thereof The end opening 11A opens on the upstream side of the second biological reaction tank 1B.

処理水排水ダクト１０Ｂの上流側端部は仕切壁３の下方部に設けられた第１開口部１２Ｂを貫通し、前記第１処理水空間５Ａに開口している。また、処理水排水ダクト１０Ｂは第２生物反応槽１Ｂ内を通って下流側に伸び、その下流側端部開口１１Ｂは前記第２処理水空間５Ｂに開口している。   The upstream end of the treated water drainage duct 10B passes through a first opening 12B provided in the lower part of the partition wall 3 and opens into the first treated water space 5A. Further, the treated water drainage duct 10B extends downstream through the second biological reaction tank 1B, and its downstream end opening 11B opens into the second treated water space 5B.

図１及び図２に基づいて、汚水処理フローについて説明する。
第１生物反応槽１Ａ及び第２生物反応槽１Ｂには担体Ｓが投入されている。また、汚水槽８、第１生物反応槽１Ａ及び第２生物反応槽１Ｂには曝気用の散気装置９ａ、９ｂ、９ｃが設けられている。
汚水槽８に流入した汚水Ｗは、散気装置９ａで曝気処理され汚水分配機構２に流入する。
汚水分配機構２の溢流堰２１を超えた汚水Ｗは分配壁２２によって、第１汚水ＷＡと第２汚水ＷＢとに分配される。 Based on FIG.1 and FIG.2, a sewage treatment flow is demonstrated.
A carrier S is introduced into the first biological reaction tank 1A and the second biological reaction tank 1B. Further, the sewage tank 8, the first biological reaction tank 1A, and the second biological reaction tank 1B are provided with aeration devices 9a, 9b, and 9c for aeration.
The sewage W that has flowed into the sewage tank 8 is aerated by the air diffuser 9 a and flows into the sewage distribution mechanism 2.
The sewage W exceeding the overflow weir 21 of the sewage distribution mechanism 2 is distributed by the distribution wall 22 into the first sewage WA and the second sewage WB.

第１汚水ＷＡは第１生物反応槽１Ａ内に流入し、散気装置９ｂで曝気処理を受けながら担体Ｓによって生物反応処理される。処理水は第１担体分離装置（スクリーン）４Ａで担体を分離されたのち、第１処理水空間５Ａ内に流入する。第１処理水空間５Ａ内の処理水は処理水排水ダクト１０Ｂの端部開口１４から処理水排水ダクト１０Ｂ内を通って下流側の端部開口１１Ｂから第２処理水空間５Ｂ内に流入し、第２の空間５Ｂ内を上昇して流出堰７から排出される。   The first sewage WA flows into the first biological reaction tank 1A, and is subjected to biological reaction treatment by the carrier S while being subjected to aeration treatment by the air diffuser 9b. The treated water is separated by the first carrier separation device (screen) 4A and then flows into the first treated water space 5A. The treated water in the first treated water space 5A flows from the end opening 14 of the treated water drain duct 10B through the treated water drain duct 10B into the second treated water space 5B through the downstream end opening 11B, It rises in the second space 5 </ b> B and is discharged from the outflow weir 7.

第２汚水ＷＢは区画室２０の底板２４に開口している流出口２５から汚水供給ダクト１０Ａ内に流入して、該ダクト内を通って、汚水供給ダクト１０Ａの下流側端部開口１１Ａから第２生物反応槽１Ｂ内に流入する。第２汚水ＷＢは散気装置９ｃで曝気処理を受けながら担体Ｓによって生物反応処理される。処理水は第２担体分離装置（スクリーン）４Ｂで担体を分離されたのち、第２処理水空間５Ｂ内に流入し、第２の空間５Ｂ内を上昇して流出堰７から排出される。   The second sewage WB flows into the sewage supply duct 10A from the outlet 25 opened in the bottom plate 24 of the compartment 20, passes through the duct, and passes through the duct from the downstream end opening 11A of the sewage supply duct 10A. 2 flows into the biological reaction tank 1B. The second sewage WB is subjected to biological reaction treatment by the carrier S while being subjected to aeration treatment by the air diffuser 9c. The treated water is separated from the carrier by the second carrier separation device (screen) 4B, then flows into the second treated water space 5B, rises in the second space 5B, and is discharged from the outflow weir 7.

ところで、処理水排水ダクト１０Ｂの上流側端部開口１４付近は処理水の流速が大きくこの付近の第２担体分離装置を通過する処理水の流速が大きい局所流が発生する。このため、担体が圧着して全体の処理効率が低下する。
図１において符号Ｘで示した箇所の部分拡大図を図３に示す。
図３に示すように、本発明の実施形態においては、第１の空間５Ａ内には、バッフル板１３が処理水排水ダクト１０Ｂの上流側端部開口１４を覆うように設けられている。このようにバッフル板１３を設けることにより局所流を低減することができ、担体分離スクリーンの閉塞がなく、安定的に運転ができ、担体剥離のための散気空気量も低減することができる。 By the way, in the vicinity of the upstream end opening 14 of the treated water drainage duct 10B, a local flow is generated in which the treated water has a high flow rate and the treated water passing through the second carrier separation device in the vicinity thereof. For this reason, the carrier is pressure-bonded and the overall processing efficiency is lowered.
FIG. 3 shows a partially enlarged view of a portion indicated by a symbol X in FIG.
As shown in FIG. 3, in the embodiment of the present invention, a baffle plate 13 is provided in the first space 5A so as to cover the upstream end opening 14 of the treated water drainage duct 10B. By providing the baffle plate 13 in this manner, the local flow can be reduced, the carrier separation screen is not blocked, the operation can be performed stably, and the amount of air diffused for peeling the carrier can also be reduced.

また、流出堰７付近は処理水の流速が大きくこの付近の第２担体分離装置を通過する処理水の流速が大きい局所流が発生する。このため、担体が圧着して全体の処理効率が低下する。
図１において符号Ｙで示した箇所の部分拡大図を図４に示す。
図４に示すように、本発明の実施形態においては、第２処理水空間５Ｂ内には、バッフル板１５が流出堰７付近を覆うように設けられている。このようにバッフル板１５を設けることにより局所流を低減することができ、担体分離スクリーンの閉塞がなく、安定的に運転ができ、担体剥離のための散気空気量も低減することができる。 In addition, the flow rate of the treated water is large in the vicinity of the outflow weir 7, and a local flow having a large flow rate of the treated water passing through the second carrier separation device in the vicinity is generated. For this reason, the carrier is pressure-bonded and the overall processing efficiency is lowered.
FIG. 4 shows a partially enlarged view of a portion indicated by a symbol Y in FIG.
As shown in FIG. 4, in the embodiment of the present invention, a baffle plate 15 is provided in the second treated water space 5 </ b> B so as to cover the vicinity of the outflow weir 7. By providing the baffle plate 15 in this manner, the local flow can be reduced, the carrier separation screen is not blocked, the operation can be stably performed, and the amount of air diffused for peeling the carrier can also be reduced.

汚水供給ダクト１０Ａは第１担体分離装置４Ａを貫通して設けても良いが、メンテナンス上は好ましくない。第１担体分離装置４Ａは、その横幅を第１生物反応槽１Ａの幅よりも短くして、第１担体分離装置４Ａの横側端部と第１生物反応槽１Ａの槽壁との間に躯体壁を設けて、この躯体壁を汚水供給ダクト１０Ａが貫通するようにすることが好ましい。
このことは、第２担体分離槽４Ｂについても同様であり、第２担体分離装置４Ｂの横側端部と第２生物反応槽１Ｂの槽壁との間に躯体壁を設けて、この躯体壁を処理水排出ダクト１０Ｂが貫通するようにすることが好ましい。 Although the sewage supply duct 10A may be provided through the first carrier separation device 4A, it is not preferable in terms of maintenance. The first carrier separation device 4A has a lateral width shorter than the width of the first biological reaction tank 1A, and is located between the lateral end of the first carrier separation device 4A and the tank wall of the first biological reaction tank 1A. It is preferable to provide a casing wall so that the sewage supply duct 10A passes through the casing wall.
The same applies to the second carrier separation tank 4B. A housing wall is provided between the lateral end of the second carrier separation device 4B and the tank wall of the second biological reaction tank 1B. It is preferable that the treated water discharge duct 10B penetrates.

上記実施形態は、汚水Ｗを２つの分割流に分割して、長さ方向に２分割した生物反応槽で処理するものである。これを２つの生物反応槽を並列に設置した場合と対比すると次の通りである。
槽幅を同じとした場合、後者では槽長さは半分となるが、横長の敷地利用となり幅広く敷地を確保する必要がある。
また、槽長さを同じとした場合、前者は槽幅が半分となり、より幅：長さ比が増大する。
上記のことから、本発明の実施形態のように、生物反応槽を２分割して直列配置して利用した方が敷地利用の点から有利であり、また、槽幅：長さ比が抑えられる配置とすることができる。
また、前記したとおり、担体分離スクリーン近傍の担体濃度は生物反応槽の縦横比と断面流速とによって定まるので、各生物反応槽の縦横比は処理水の速度を勘案して適宜の値に決定することができる。 The said embodiment divides the sewage W into two divided flows and treats it in a biological reaction tank divided into two in the length direction. This is compared with the case where two biological reaction tanks are installed in parallel as follows.
If the tank width is the same, the tank length is halved in the latter case, but it is necessary to secure a wide site by using a horizontally long site.
Further, when the tank length is the same, the former has a half tank width, and the width: length ratio is further increased.
From the above, as in the embodiment of the present invention, it is advantageous from the point of use of the site that the biological reaction tank is divided into two parts and arranged in series, and the tank width: length ratio is suppressed. It can be arranged.
In addition, as described above, the carrier concentration in the vicinity of the carrier separation screen is determined by the aspect ratio of the biological reaction tank and the cross-sectional flow velocity. Therefore, the aspect ratio of each biological reaction tank is determined to an appropriate value in consideration of the speed of the treated water. be able to.

次に、汚水Ｗを３以上の分割流に分割して、長さ方向に３以上に分割した生物反応槽で処理する場合を図５に基づいて説明する。
図５における（１）、（２）、（３）、（ｎ）の流れは第1分割流、第２分割流、第３分割流、・・・第ｎ分割流のそれぞれがどのように生物反応槽内を通過するかを模式的に示したものであり、生物反応槽が幅方向に分割されていることを意味するものではない。 Next, the case where the wastewater W is divided into three or more divided flows and treated in the biological reaction tank divided into three or more in the length direction will be described with reference to FIG.
The flow of (1), (2), (3), (n) in FIG. 5 shows how the first divided flow, the second divided flow, the third divided flow,... It schematically shows whether or not it passes through the reaction tank, and does not mean that the biological reaction tank is divided in the width direction.

まず、汚水Ｗが生物反応処理されて担体分離装置で単体を分離されるまでの流れを説明する。
汚水分配機構によって汚水Ｗは複数の分割流（第１分割流、第２分割流、・・・第ｎ分割流）に分割される。
第１分割流は第1生物反応槽に供給されて生物反応処理を受けて第1生物反応槽の処理水空間に流入する。
第２分割流は第１仕切壁を貫通する汚水供給ダクトに導かれて第２生物反応槽に供給されて生物反応処理を受けて第２生物反応槽の処理水空間に流入する。
第３分割流は第１仕切壁及び第２仕切壁を貫通する汚水供給ダクトに導かれて第３生物反応槽に供給されて生物反応処理を受けて第３生物反応槽の処理水空間に流入する。
第ｎ分割流は第１仕切壁から第ｎ−１仕切壁までの仕切壁を貫通する汚水供給ダクトに導かれて第ｎ生物反応槽に供給されて生物反応処理を受けて第ｎ生物反応槽の処理水空間に流入する。
最後の分割流は第１仕切壁から最後の仕切壁までの仕切壁を貫通する汚水供給ダクトに導かれて最後の生物反応槽に供給されて生物反応処理を受けて最後の生物反応槽の処理水空間に流入する。 First, the flow from when the sewage W is subjected to a biological reaction process to be separated by a carrier separation device will be described.
The sewage W is divided into a plurality of divided flows (first divided flow, second divided flow,... Nth divided flow) by the sewage distribution mechanism.
The first divided flow is supplied to the first biological reaction tank, receives the biological reaction treatment, and flows into the treated water space of the first biological reaction tank.
The second divided flow is guided to a sewage supply duct penetrating the first partition wall, supplied to the second biological reaction tank, undergoes a biological reaction process, and flows into the treated water space of the second biological reaction tank.
The third divided flow is led to a sewage supply duct penetrating the first partition wall and the second partition wall, supplied to the third biological reaction tank, subjected to biological reaction treatment, and flows into the treated water space of the third biological reaction tank. To do.
The n-th divided flow is led to a sewage supply duct that passes through the partition walls from the first partition wall to the (n-1) -th partition wall, is supplied to the n-th biological reaction tank, is subjected to a biological reaction treatment, and receives an n-th biological reaction tank. Into the treated water space.
The last divided flow is led to a sewage supply duct penetrating the partition wall from the first partition wall to the last partition wall, is supplied to the last biological reaction tank, is subjected to the biological reaction treatment, and is processed in the last biological reaction tank. It flows into the water space.

第１生物反応槽の処理水空間に流入した処理水は、第１仕切壁から最後の仕切壁までの仕切壁を貫通する処理水排出ダクトを通って最後の生物反応槽の処理水空間に流入する。
第２生物反応槽の処理水空間に流入した処理水は、第２仕切壁から最後の仕切壁までの仕切壁を貫通する処理水排出ダクトを通って最後の生物反応槽の処理水空間に流入する。
第３生物反応槽の処理水空間に流入した処理水は、第３仕切壁から最後の仕切壁までの仕切壁を貫通する処理水排出ダクトを通って最後の生物反応槽の処理水空間に流入する。
第ｎ生物反応槽の処理水空間に流入した処理水は、第ｎ仕切壁から最後の仕切壁までの仕切壁を貫通する処理水排出ダクトを通って最後の生物反応槽の処理水空間に流入する。
最後の生物処理槽の処理水は、処理水排出ダクトを通って最後の生物反応槽の処理水空間に流入した処理水と合流して流出堰を超えて排出される。 The treated water that has flowed into the treated water space of the first biological reaction tank flows into the treated water space of the last biological reaction tank through the treated water discharge duct that penetrates the partition wall from the first partition wall to the last partition wall. To do.
The treated water that has flowed into the treated water space of the second biological reaction tank flows into the treated water space of the last biological reaction tank through the treated water discharge duct that penetrates the partition wall from the second partition wall to the last partition wall. To do.
The treated water flowing into the treated water space of the third biological reaction tank flows into the treated water space of the last biological reaction tank through the treated water discharge duct penetrating the partition wall from the third partition wall to the last partition wall. To do.
The treated water flowing into the treated water space of the nth biological reaction tank flows into the treated water space of the last biological reaction tank through the treated water discharge duct penetrating the partition wall from the nth partition wall to the last partition wall. To do.
The treated water in the last biological treatment tank joins the treated water that has flowed into the treated water space of the last biological reaction tank through the treated water discharge duct and is discharged beyond the outflow weir.

１ 生物反応槽
１Ａ 第１生物反応槽
１Ｂ 第２生物反応槽
２ 汚水分配機構
３ 仕切壁
４ 担体分離装置
４Ａ 第１担体分離装置
４Ｂ 第２担体分離装置
５Ａ 第１処理水空間
５Ｂ 第２処理水空間
６ 第１生物反応槽の下流側槽壁
７ 流出堰
８ 汚水槽
９ａ、９ｂ、９ｃ 散気装置
１０Ａ 汚水供給ダクト
１０Ｂ 処理水排出ダクト
１１Ａ 汚水供給ダクトの下流側端部開口
１１Ｂ 処理水排出ダクトの下流側端部開口
１２Ａ 開口部
１２Ｂ 開口部
１３、１５ バッフル板
１４ 処理水排出ダクトの上流側端部開口
２１ 溢流堰
２２ 分配壁
２３ 区画壁
２０ 区画室
２４ 底板
２５ 流出口
３１ 生物反応槽
３２ 担体分離板
３３ 移送管
３４ 下流側流入口
３５ 流入口
３６ 流入調整具
Ｓ 担体
Ｗ 汚水
ＷＡ 第１汚水
ＷＢ 第２汚水 1 biological reaction tank 1A first biological reaction tank 1B second biological reaction tank 2 sewage distribution mechanism 3 partition wall 4 carrier separation device 4A first carrier separation device 4B second carrier separation device 5A first treated water space 5B second treated water Space 6 Downstream tank wall 7 of first biological reaction tank 7 Outflow weir 8 Sewage tanks 9a, 9b, 9c Aeration device 10A Sewage supply duct 10B Treated water discharge duct 11A Downstream end opening 11B of sewage supply duct Treated water discharge duct Downstream end opening 12A opening 12B opening 13, 15 baffle plate 14 upstream end opening 21 of treated water discharge duct overflow weir 22 partition wall 23 partition wall 20 partition chamber 24 bottom plate 25 outlet 31 bioreactor 32 Carrier separation plate 33 Transfer pipe 34 Downstream inlet 35 Inlet 36 Inflow regulator S Carrier W Wastewater WA First wastewater WB Second wastewater

Claims (3)

担体を用いて生物処理を行う生物反応槽と、前記生物反応槽に汚水を供給する汚水供給手段と、前記生物反応槽から処理水を排出する処理水排出手段とを備えた担体投入型汚水処理装置であって、
前記汚水供給手段は汚水を複数の分割流に分割する汚水分配機構を備えており、
前記生物反応槽は仕切壁によって長さ方向に複数個の生物反応槽に分割されており、
各生物反応槽のそれぞれには担体分離装置が設けられており、
担体分離装置と生物反応槽の下流側仕切壁又は下流側槽壁との間には処理水空間が設けられており、
第１番目の分割流は第１番目の生物反応槽に供給されるようになっており、
第１生物反応槽を除く各生物反応槽と前記汚水分配機構とは汚水供給ダクトによって連通するとともに、下流側端の生物反応槽を除く各生物反応槽の処理水空間と下流側端の生物反応槽の処理水空間とは処理水排出ダクトによって連通しており、
第ｎ番目（ｎ＝１を除く）の分割流を導く汚水供給ダクトは第１番目の仕切壁から第ｎ−１番目の仕切壁までを貫通してｎ番目の生物反応槽の上流側に開口しており、
第ｎ番目の生物反応槽からの処理水を排出する処理水排出ダクトは第ｎ番目の生物反応槽の処理水空間に開口すると共に、第ｎ番目の仕切壁から最後の仕切壁までを貫通して最後の生物反応槽の処理水空間に開口しており、
前記処理水空間には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 system comprising: a biological reaction tank that performs biological treatment using a carrier; a sewage supply means that supplies sewage to the biological reaction tank; and a treated water discharge means that discharges treated water from the biological reaction tank. A device,
The sewage supply means includes a sewage distribution mechanism that divides sewage into a plurality of divided flows,
The biological reaction tank is divided into a plurality of biological reaction tanks in the length direction by a partition wall;
Each biological reaction tank is provided with a carrier separation device,
A treated water space is provided between the carrier separator and the downstream partition wall or the downstream tank wall of the biological reaction tank,
The first split stream is fed to the first biological reactor,
Each biological reaction tank except the first biological reaction tank and the sewage distribution mechanism communicate with each other by a sewage supply duct, and the treated water space of each biological reaction tank except the biological reaction tank at the downstream end and the biological reaction at the downstream end. The treated water space of the tank communicates with the treated water discharge duct,
The sewage supply duct for guiding the nth (except for n = 1) divided flow passes through the first partition wall to the (n-1) th partition wall and opens upstream of the nth biological reaction tank. And
A treated water discharge duct for discharging treated water from the nth biological reaction tank opens into the treated water space of the nth biological reaction tank and penetrates from the nth partition wall to the last partition wall. Open to the treated water space of the last biological reaction tank,
A baffle plate is installed upright in the treated water space. 担体を用いて生物処理を行う生物反応槽と、前記生物反応槽に汚水を供給する汚水供給手段と、前記生物反応槽から処理水を排出する処理水排出手段とを備えた担体投入型汚水処理装置であって、
前記汚水供給手段は汚水を２つの分割流に分割する汚水分配機構を備えており、
前記生物反応槽は仕切壁によって長さ方向に第１生物反応槽と第２生物反応槽とに分割されており、
第１生物反応槽及び第２生物反応槽にはそれぞれ第１担体分離装置及び第２担体分離装置が設けられており、
第１担体分離装置と仕切壁との間には第１処理水空間が設けられ、
第２担体分離装置と第２生物反応槽の下流側槽壁との間には第２処理水空間が設けられ、
第１の分割流は第１生物反応槽に供給されるようになっており、
第２の分割流を導く汚水供給ダクトが、その上流側端部が前記汚水分配機構に連通すると共に、その下流側端部が第２生物反応槽の上流側に開口するように仕切壁を貫通して設けられ、
第１生物反応槽からの処理水を排出する処理水排出ダクトが、その上流側端部が前記第１処理水空間に開口すると共に、その下流側端部が前記第２処理水空間に開口するように仕切壁を貫通して設けられ、
前記第１処理水空間及び第２処理水空間には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 system comprising: a biological reaction tank that performs biological treatment using a carrier; a sewage supply means that supplies sewage to the biological reaction tank; and a treated water discharge means that discharges treated water from the biological reaction tank. A device,
The sewage supply means includes a sewage distribution mechanism that divides sewage into two divided flows,
The biological reaction tank is divided into a first biological reaction tank and a second biological reaction tank in a longitudinal direction by a partition wall;
The first biological reaction tank and the second biological reaction tank are provided with a first carrier separation device and a second carrier separation device, respectively.
A first treated water space is provided between the first carrier separation device and the partition wall,
A second treated water space is provided between the second carrier separation device and the downstream tank wall of the second biological reaction tank,
The first split stream is supplied to the first biological reactor,
The sewage supply duct for guiding the second divided flow passes through the partition wall so that its upstream end communicates with the sewage distribution mechanism and its downstream end opens to the upstream side of the second biological reaction tank. Provided,
The treated water discharge duct for discharging treated water from the first biological reaction tank has an upstream end opened to the first treated water space and a downstream end opened to the second treated water space. Provided through the partition wall,
A baffle plate is provided upright in the first treated water space and the second treated water space. 前記汚水分配機構は、溢流堰と分配壁とを含み前記分配壁は溢流堰を越えた汚水を複数の分割流に分割する位置に設けられていることを特徴とする請求項１または２に記載の担体投入型汚水処理装置。   3. The sewage distribution mechanism includes an overflow weir and a distribution wall, and the distribution wall is provided at a position that divides sewage beyond the overflow weir into a plurality of divided flows. The carrier input type sewage treatment apparatus as described in 1.
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* Cited by examiner, † Cited by third party
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JPH02214597A (en) * 1989-02-16 1990-08-27 Hitachi Plant Eng & Constr Co Ltd Device for nitrifying sewage
JPH07328675A (en) * 1994-06-03 1995-12-19 Ebara Res Co Ltd Aerobic organism treating device
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