JP7131346B2 - Air diffuser and membrane separation activated sludge system - Google Patents

Air diffuser and membrane separation activated sludge system Download PDF

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JP7131346B2
JP7131346B2 JP2018228382A JP2018228382A JP7131346B2 JP 7131346 B2 JP7131346 B2 JP 7131346B2 JP 2018228382 A JP2018228382 A JP 2018228382A JP 2018228382 A JP2018228382 A JP 2018228382A JP 7131346 B2 JP7131346 B2 JP 7131346B2
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胤制 李
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    • YGENERAL 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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Description

本発明は、散気装置及び膜分離活性汚泥装置に関する。 TECHNICAL FIELD The present invention relates to an air diffuser and a membrane separation activated sludge apparatus.

工業廃水や生活廃水は、廃水中に含まれる有機物等を取り除く処理が施されてから、工業用水として再利用されるか、もしくは河川等に放流される。工業廃水等の処理方法としては、例えば、曝気して好気的な微生物に有機物等を分解させる活性汚泥法が挙げられる。 Industrial wastewater and domestic wastewater are treated to remove organic substances and the like contained in the wastewater, and then reused as industrial water or discharged into rivers and the like. Examples of methods for treating industrial wastewater include an activated sludge method in which aerobic microorganisms decompose organic matter by aeration.

活性汚泥法による処理と、分離膜モジュールによる膜ろ過とを組み合わせた膜分離活性汚泥(MBR)法による処理が知られている。MBR法による処理では、膜ろ過を継続するに従って分離膜表面に有機物等が堆積することにより、ろ過流量の低下や、膜間差圧の上昇が生じることがある。そのため、MBR法による処理では、一般に膜モジュールの下方に散気装置を設置し、散気装置で発生させた気泡が膜表面に接触するときの衝撃、もしくは気泡の発生に伴う水流によって膜自体を振動させて、膜表面への有機物等の堆積を抑制している。 Treatment by a membrane separation activated sludge (MBR) method, which combines treatment by the activated sludge method and membrane filtration by a separation membrane module, is known. In the treatment by the MBR method, as the membrane filtration continues, organic matter and the like accumulate on the surface of the separation membrane, which may cause a decrease in the filtration flow rate and an increase in the transmembrane pressure difference. Therefore, in the treatment by the MBR method, an air diffuser is generally installed below the membrane module, and the air bubbles generated by the air diffuser come into contact with the surface of the membrane. By vibrating, deposition of organic substances and the like on the film surface is suppressed.

散気装置としては、曝気時の気泡のサイズが大きく、膜表面の洗浄性に優れることから、サイフォンの原理を利用して間欠的に曝気する散気装置が提案されている。例えば、内部が空洞で下方が解放され、上部に空気供給口が形成された散気ケースと、散気ケース内に設けられ、上方が解放された箱状(例えば、上方が解放され、側面側及び底面側が気密に封止された形状)の第1導出部と、散気ケースの上部から第1導出部内に向かって下方に延びる複数の管状の第2導出部とを備える散気装置が知られている(特許文献1、2)。 As an air diffuser, an air diffuser that intermittently aerates using the principle of a siphon has been proposed because the bubble size during aeration is large and the surface of the membrane is easily washed. For example, an air diffusion case having a hollow interior with an open bottom and an air supply port formed at the top, and a box-like case provided in the air diffusion case with an open top (for example, an open top and side surfaces) and a shape in which the bottom side is airtightly sealed) and a plurality of tubular second outlets extending downward from the upper part of the diffusion case toward the inside of the first outlet. (Patent Documents 1 and 2).

特開2018-103134号公報JP 2018-103134 A 特開2018-103135号公報JP 2018-103135 A

しかし、特許文献1、2のような従来の散気装置では、散気装置の設置時の勾配や、散気装置内の液面の波打ち等によって各第2導出部からの曝気が不均一になり、上方の膜モジュールの膜表面が均等に洗浄されないことがある。 However, in conventional air diffusers such as Patent Documents 1 and 2, the aeration from each second lead-out portion becomes uneven due to the gradient at the time of installation of the air diffuser, waviness of the liquid surface in the air diffuser, etc. and the membrane surfaces of the upper membrane modules may not be evenly cleaned.

本発明は、このような事情に鑑みてなされてものであって、サイフォンの原理を利用して間欠的に曝気でき、かつ複数の第2導出部から均等に曝気できる散気装置、及び前記散気装置を用いた膜分離活性汚泥装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and provides an air diffuser capable of intermittent aeration using the siphon principle and capable of evenly aerating from a plurality of second lead-out portions, and the diffuser. An object of the present invention is to provide a membrane separation activated sludge system using a gas system.

本発明は、以下の構成を有する。
[1]被処理水中で間欠的に曝気を行う散気装置であって、
被処理水中に浸漬され、内部が空洞で、下部に被処理水流入部が形成された本体部と、
前記本体部の内部に設けられ、上側が開口し、かつ、側面側及び底面側が気密に封止された第1導出部と、
前記本体部の上部から下方に延びるように設けられ、両端が開口した複数の第2導出部と、
少なくとも1つの仕切部と、を備え、
各々の前記第2導出部は、それぞれの下端が前記第1導出部の下部から離間した状態で、前記第1導出部の上側から前記第1導出部内に部分的に入り込み、
前記本体部には、前記本体部の内部における前記第1導出部の外側に空気を供給する空気供給口が形成され、
前記第1導出部内は平面視で前記仕切部によって複数の領域に仕切られ、各々の仕切られた領域に前記第2導出部がそれぞれ入り込んでいる、散気装置。
[2]前記第1導出部内の平面視で前記仕切部によって仕切られた複数の領域に、それぞれ1本ずつ前記第2導出部が入り込んでいる、[1]に記載の散気装置。
[3]前記本体部が直方体状で、前記の複数の第2導出部が平面視で前記本体部の長手方向に互いに間隔を空けて並んで設けられている、[1]又は[2]に記載の散気装置。
[4]前記の複数の第2導出部が平面視で前記本体部の長手方向に一列に並び、前記第2導出部の数をn本としたとき、前記仕切部の数がn-1個である、[3]に記載の散気装置。
[5]前記仕切部の上端の位置が前記第1導出部の上端よりも高く、前記仕切部の下端の位置が前記第2導出部の下端よりも低い、[1]~[4]のいずれかに記載の散気装置。
[6]活性汚泥を含む汚泥含有処理水を膜分離する膜モジュールと、[1]~[5]のいずれかに記載の散気装置と、を備える膜分離活性汚泥装置。
The present invention has the following configurations.
[1] An air diffuser that intermittently aerates water to be treated,
a main body that is immersed in the water to be treated, has a hollow interior, and has a water inlet portion formed at the bottom;
a first lead-out portion provided inside the main body portion, the upper side of which is open, and the side and bottom sides of which are airtightly sealed;
a plurality of second lead-out portions extending downward from the upper portion of the main body and having both ends open;
at least one partition;
each of the second lead-out portions partially enters into the first lead-out portion from the upper side of the first lead-out portion with the lower end of each of the second lead-out portions being separated from the lower portion of the first lead-out portion;
The main body portion is formed with an air supply port for supplying air to the outside of the first lead-out portion inside the main body portion,
The air diffusion device, wherein the interior of the first lead-out portion is partitioned into a plurality of regions by the partition portion in plan view, and the second lead-out portion enters each of the partitioned regions.
[2] The air diffuser according to [1], wherein one of the second lead-out portions enters each of a plurality of regions partitioned by the partition portion in plan view inside the first lead-out portion.
[3] In [1] or [2], wherein the main body has a rectangular parallelepiped shape, and the plurality of second lead-out portions are arranged side by side at intervals in the longitudinal direction of the main body in a plan view. Air diffuser as described.
[4] When the plurality of second lead-out portions are arranged in a line in the longitudinal direction of the main body in plan view, and the number of the second lead-out portions is n, the number of the partition portions is n−1. The air diffuser according to [3].
[5] Any one of [1] to [4], wherein the upper end of the partition is higher than the upper end of the first lead-out portion, and the lower end of the partition is lower than the lower end of the second lead-out portion. The air diffuser according to .
[6] A membrane separation activated sludge apparatus comprising a membrane module for membrane separation of sludge-containing treated water containing activated sludge, and the air diffuser according to any one of [1] to [5].

本発明によれば、サイフォンの原理を利用して間欠的に曝気でき、かつ複数の第2導出部から均等に曝気できる散気装置、及び前記散気装置を用いた膜分離活性汚泥装置を提供することができる。 According to the present invention, an air diffuser capable of intermittent aeration using the siphon principle and uniform aeration from a plurality of second outlets, and a membrane separation activated sludge apparatus using the air diffuser are provided. can do.

水処理装置の一例を示した概略模式図である。BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic diagram which showed an example of the water treatment apparatus. 本発明の散気装置の一例を示した斜視図である。It is a perspective view showing an example of the air diffuser of the present invention. 図2の散気装置のI-I断面図である。FIG. 3 is a cross-sectional view of the air diffuser of FIG. 2 taken along line II. 図3の第1導出部及び第2導出部のII-II断面図である。FIG. 4 is a II-II cross-sectional view of the first lead-out portion and the second lead-out portion of FIG. 3; 本発明の散気装置の他の例を示した断面図である。FIG. 4 is a cross-sectional view showing another example of the air diffuser of the present invention; 本発明の散気装置の他の例を示した断面図である。FIG. 4 is a cross-sectional view showing another example of the air diffuser of the present invention;

なお、以下の説明において例示される図の寸法等は一例であって、本発明はそれらに必ずしも限定されるものではなく、その要旨を変更しない範囲で適宜変更して実施することが可能である。 It should be noted that the dimensions and the like of the drawings illustrated in the following description are only examples, and the present invention is not necessarily limited to them, and can be implemented with appropriate changes within the scope of not changing the gist of the present invention. .

〔水処理装置〕
図1に示すように、水処理装置1000は、活性汚泥処理槽11と、活性汚泥処理槽11の後段に設けられた膜分離槽21と、膜分離槽21の後段に設けられた処理水槽41とを備えている。さらに、水処理装置1000は、図示を省略するが、活性汚泥処理槽11に流入する原水の流量を調整する流量調整槽、膜分離槽21から余剰汚泥を引く抜く引抜ポンプ、膜分離槽21に薬液や希釈水を送液する送液手段、及び処理水槽41から工場や河川等に処理水を放流する放流手段等を備えている。
[Water treatment equipment]
As shown in FIG. 1, the water treatment apparatus 1000 includes an activated sludge treatment tank 11, a membrane separation tank 21 provided downstream of the activated sludge treatment tank 11, and a treated water tank 41 provided downstream of the membrane separation tank 21. and Furthermore, although illustration is omitted, the water treatment apparatus 1000 includes a flow rate adjustment tank for adjusting the flow rate of raw water flowing into the activated sludge treatment tank 11, a drawing pump for drawing excess sludge from the membrane separation tank 21, and a It is provided with a liquid feeding means for feeding a chemical solution or dilution water, and a discharging means for discharging the treated water from the treated water tank 41 to a factory, a river, or the like.

活性汚泥処理槽11は、活性汚泥処理を行うために活性汚泥を充填するものである。
活性汚泥処理槽11には、第1の流路12と第2の流路13とが接続されている。第1の流路12は、工場や家庭等から排出された原水を活性汚泥処理槽11に流入させる流路である。第2の流路13は、活性汚泥処理槽11から排出された汚泥含有処理水(被処理水)を膜分離槽21に流入させる流路である。
The activated sludge treatment tank 11 is filled with activated sludge for performing activated sludge treatment.
A first channel 12 and a second channel 13 are connected to the activated sludge treatment tank 11 . The first channel 12 is a channel through which raw water discharged from factories, households, etc. flows into the activated sludge treatment tank 11 . The second channel 13 is a channel through which sludge-containing treated water (water to be treated) discharged from the activated sludge treatment tank 11 flows into the membrane separation tank 21 .

活性汚泥処理槽11内には槽内を好気条件に維持するために曝気装置14が設置されている。
曝気装置14は、活性汚泥処理槽11内で曝気する曝気管14aと、曝気管14aに空気を供給する供給管14bと、空気を送気するブロア14cとを備えている。
曝気管14aとしては、ブロア14cから供給される空気を上方へ吐出できるものであれば特に限定されず、例えば、穴あきの単管やメンブレンタイプのものが挙げられる。
An aerator 14 is installed in the activated sludge treatment tank 11 to maintain the inside of the tank in an aerobic condition.
The aeration device 14 includes an aeration pipe 14a for aerating the inside of the activated sludge treatment tank 11, a supply pipe 14b for supplying air to the aeration pipe 14a, and a blower 14c for supplying air.
The aeration pipe 14a is not particularly limited as long as it can discharge the air supplied from the blower 14c upward, and examples thereof include a perforated single pipe and a membrane type.

膜分離槽21は、活性汚泥処理槽11から送られてきた、活性汚泥及び生物処理水を含む汚泥含有処理水を溜めるものである。
膜分離槽21は、本発明の一態様を適用した膜分離活性汚泥装置100(以下、「MBR装置100」と称することがある。)を備えている。MBR装置100については後述する。
The membrane separation tank 21 stores sludge-containing treated water containing activated sludge and biologically treated water sent from the activated sludge treatment tank 11 .
The membrane separation tank 21 includes a membrane separation activated sludge apparatus 100 (hereinafter sometimes referred to as "MBR apparatus 100") to which one aspect of the present invention is applied. The MBR device 100 will be described later.

膜分離槽21と活性汚泥処理槽11には汚泥返送手段30が接続されている。汚泥返送手段30は、膜分離槽21から活性汚泥処理槽11に、汚泥含有処理水の一部を返送するものである。
汚泥返送手段30は、第4の流路31を備えている。第4の流路31は、汚泥含有処理水の一部を膜分離槽21から排出し、活性汚泥処理槽11に流入させる流路である。
第4の流路31には、ポンプ31aが設置されている。これにより、膜分離槽21内の汚泥含有処理水の一部を膜分離槽21から活性汚泥処理槽11に返送することができる。
A sludge return means 30 is connected to the membrane separation tank 21 and the activated sludge treatment tank 11 . The sludge return means 30 returns part of the sludge-containing treated water from the membrane separation tank 21 to the activated sludge treatment tank 11 .
The sludge return means 30 has a fourth flow path 31 . The fourth channel 31 is a channel for discharging part of the sludge-containing treated water from the membrane separation tank 21 and allowing it to flow into the activated sludge treatment tank 11 .
A pump 31 a is installed in the fourth flow path 31 . As a result, part of the sludge-containing treated water in the membrane separation tank 21 can be returned from the membrane separation tank 21 to the activated sludge treatment tank 11 .

処理水槽41は、汚泥含有処理水を膜分離した後の処理水を貯留するものである。 The treated water tank 41 stores the treated water after membrane separation of the sludge-containing treated water.

<膜分離活性汚泥装置>
MBR装置100は、複数の膜モジュール22と、それら膜モジュール22の下方に設けられた散気装置10と、を備えている。
<Membrane separation activated sludge system>
The MBR device 100 includes a plurality of membrane modules 22 and an air diffuser 10 provided below the membrane modules 22 .

膜モジュール22は、活性汚泥を含む汚泥含有処理水を膜分離するものである。膜モジュール22は分離膜を備え、この分離膜により汚泥含有処理水が生物処理水と活性汚泥とに固液分離(膜分離)される。 The membrane module 22 membrane-separates sludge-containing treated water containing activated sludge. The membrane module 22 has a separation membrane, and the separation membrane separates sludge-containing treated water into biologically treated water and activated sludge by solid-liquid separation (membrane separation).

分離膜としては、分離能を有するものであれば特に限定されず、例えば、中空糸膜、平膜、チューブラ膜、モノリス型膜等が挙げられる。これらの中でも、容積充填率が高いことから、中空糸膜が好ましい。 The separation membrane is not particularly limited as long as it has separation ability, and examples thereof include hollow fiber membranes, flat membranes, tubular membranes, monolithic membranes, and the like. Among these membranes, hollow fiber membranes are preferred because of their high volume filling factor.

分離膜として中空糸膜を用いる場合、その材質としては、例えば、セルロース、ポリオレフィン、ポリスルフォン、ポリフッ化ビニリデンフロライド(PVDF)、ポリ四フッ化エチレン(PTFE)等が挙げられる。これらの中でも、中空糸膜の材質としては、耐薬品性やpH変化に強い点から、PVDF、PTFEが好ましい。
分離膜としてモノリス型膜を用いる場合は、セラミック製の膜を用いることが好ましい。
When a hollow fiber membrane is used as the separation membrane, its material includes, for example, cellulose, polyolefin, polysulfone, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and the like. Among these, PVDF and PTFE are preferable as the material for the hollow fiber membrane because of their chemical resistance and resistance to pH changes.
When a monolithic membrane is used as the separation membrane, it is preferable to use a ceramic membrane.

分離膜に形成される微細孔の平均孔径としては、一般に限外分離膜と呼ばれる膜で0.001~0.1μm程度であり、一般に精密分離膜と呼ばれる膜で0.1~1μm程度である。本実施形態においては平均孔径が前記範囲内である分離膜を用いることが好ましい。 The average pore diameter of the micropores formed in the separation membrane is about 0.001 to 0.1 μm for a membrane generally called an ultraseparation membrane, and about 0.1 to 1 μm for a membrane generally called a precision separation membrane. . In the present embodiment, it is preferable to use a separation membrane having an average pore size within the above range.

膜モジュール22には、第3の流路33が接続されている。第3の流路33は、分離膜を透過した処理水を膜分離槽21から排出し、処理水槽41に流入させる流路である。
第3の流路33には、ポンプ33aが設置されている。これにより、膜モジュール22の分離膜を透過した処理水を膜分離槽21から排出できるようになっている。
A third channel 33 is connected to the membrane module 22 . The third channel 33 is a channel for discharging the treated water that has passed through the separation membrane from the membrane separation tank 21 and allowing it to flow into the treated water tank 41 .
A pump 33 a is installed in the third flow path 33 . This allows the treated water that has passed through the separation membranes of the membrane module 22 to be discharged from the membrane separation tank 21 .

散気装置10は、汚泥含有処理水(被処理水)中で間欠的に曝気を行う散気装置である。散気装置10は、図2~4に示すように、本体部50と、第1導出部52と、複数の第2導出部54と、複数の仕切部56と、を備えている。散気装置10は、膜分離槽21内において被処理水中に浸漬された状態で設けられる。 The air diffuser 10 is an air diffuser that intermittently aerates sludge-containing treated water (water to be treated). As shown in FIGS. 2 to 4, the air diffuser 10 includes a main body portion 50, a first lead-out portion 52, a plurality of second lead-out portions 54, and a plurality of partition portions 56. As shown in FIG. The air diffuser 10 is provided in a state of being immersed in the water to be treated in the membrane separation tank 21 .

本体部50は、内部が空洞の直方体状の筐体であり、下部が解放されて被処理水流入部58が形成されている。本体部50が被処理水中に浸漬された状態では、被処理水流入部58から被処理水が本体部50の内部に浸入する。
なお、本体部50の形状は、直方体状には限定されず、例えば、立方体状、円柱状等であってもよい。
The main body part 50 is a rectangular parallelepiped housing with a hollow interior, and the lower part is opened to form a water inflow part 58 to be treated. While the main body 50 is immersed in the water to be treated, the water to be treated enters the inside of the main body 50 from the water inflow part 58 to be treated.
In addition, the shape of the main body part 50 is not limited to a rectangular parallelepiped shape, and may be, for example, a cubic shape, a cylindrical shape, or the like.

第1導出部52は、直方体状の上側が開口し、かつ、側面側及び底面側が気密に封止された部材(例えば、箱状の部材)であり、本体部50の内部に設けられている。第1導出部52は、第1導出部52の上端52cが本体部50の上部50aから離間した状態で本体部50の内部に配置されている。
なお、第1導出部52の形状は、直方体状には限定されず、本体部50の形状、第2導出部54の配置等に応じて適宜設定でき、例えば、立方体状、円筒状等であってもよい。
The first lead-out portion 52 is a member (for example, a box-shaped member) whose rectangular parallelepiped upper side is open and whose side and bottom sides are airtightly sealed, and is provided inside the main body portion 50. . The first lead-out portion 52 is arranged inside the body portion 50 with the upper end 52 c of the first lead-out portion 52 separated from the upper portion 50 a of the body portion 50 .
The shape of the first lead-out portion 52 is not limited to a rectangular parallelepiped shape, and can be appropriately set according to the shape of the main body portion 50, the arrangement of the second lead-out portion 54, and the like. may

複数の第2導出部54は、例えば、両端が開口した管状であり、本体部50の上部50aから下方に延びるように設けられている。各々の第2導出部54の上側開口端54aは散気穴となる。
散気装置10では、本体部50の内部における第1導出部52の上端52cから第2導出部54の下端54cまでの空間がサイフォン室70となり、サイフォン室70に貯留されている空気が後述のようにサイフォンの原理によって各第2導出部54から間欠的に曝気される。
The plurality of second lead-out portions 54 are, for example, tubular with both ends opened, and are provided so as to extend downward from the upper portion 50 a of the main body portion 50 . An upper open end 54a of each second lead-out portion 54 serves as an air diffusion hole.
In the air diffuser 10, the space from the upper end 52c of the first lead-out portion 52 to the lower end 54c of the second lead-out portion 54 inside the main body portion 50 serves as a siphon chamber 70, and the air stored in the siphon chamber 70 is As shown, the air is intermittently aerated from each of the second lead-out portions 54 by the siphon principle.

この例の各々の第2導出部54は、平面視で本体部50の長手方向に互いに間隔を空けて並んで設けられている。長手方向に並ぶ複数の第2導出部54は、等間隔に配置されていてもよく、隣り合う第2導出部54ごとに間隔が変わるように配置されていてもよい。各々の第2導出部54から均等に曝気されやすい点では、複数の第2導出部54は等間隔に配置されていることが好ましい。 Each of the second lead-out portions 54 in this example is arranged side by side at intervals in the longitudinal direction of the main body portion 50 in plan view. The plurality of second lead-out portions 54 arranged in the longitudinal direction may be arranged at regular intervals, or may be arranged such that the intervals between the adjacent second lead-out portions 54 are different. It is preferable that the plurality of second lead-out portions 54 are arranged at equal intervals in that the air is easily aerated uniformly from each of the second lead-out portions 54 .

各々の第2導出部54は、それぞれの下端54cが第1導出部52の下部52dから離間した状態で、第1導出部52の上側から第1導出部52内に部分的に入り込んでいる。
各第2導出部54の上側開口端54aからの曝気を均等にしやすい点では、各々の第2導出部54の下側開口端54bの上下方向の位置は、この例のように一致していることが好ましい。なお、本発明の効果を損なわない範囲であれば、各々の第2導出部54の下側開口端54bの上下方向の位置がずれていてもよい。
Each of the second lead-out portions 54 partially enters the first lead-out portion 52 from the upper side of the first lead-out portion 52 with the lower end 54c of each second lead-out portion 54 being spaced from the lower portion 52d of the first lead-out portion 52 .
The vertical positions of the lower open ends 54b of the second lead-out portions 54 match each other, as in this example, in that the aeration from the upper open ends 54a of the second lead-out portions 54 can be made uniform. is preferred. It should be noted that the positions of the lower opening ends 54b of the respective second lead-out portions 54 may be displaced in the vertical direction as long as the effects of the present invention are not impaired.

また、各第2導出部54は、上側の一部が本体部50の上部50aから上方に突き出た状態になっている。なお、散気装置10の態様は、各第2導出部54の上側が本体部50の上部50aから突き出た態様には限定されず、例えば、各第2導出部54の上側開口端54aが本体部50の上面と一致している態様であってもよい。 Further, each second lead-out portion 54 is in a state in which an upper portion thereof protrudes upward from the upper portion 50 a of the main body portion 50 . In addition, the aspect of the air diffuser 10 is not limited to the aspect in which the upper side of each second lead-out portion 54 protrudes from the upper portion 50a of the main body portion 50. For example, the upper open end 54a of each second lead-out portion 54 protrudes from the main body It may be in a mode that matches the upper surface of the portion 50 .

第2導出部54の形状は、この例では円筒状である。なお、第2導出部54の形状は円筒状には限定されず、例えば、四角筒状等であってもよい。
第2導出部54の流路断面積は、適宜設定でき、例えば、100~2000mmとすることができる。気泡形状、間欠曝気性、均等曝気性、中空糸膜の洗浄性及び空気供給量(省エネルギー性)等の観点から、第2導出部54の流路断面積は、500~1750mmが好ましく、750~1600mmがより好ましい。
The shape of the second lead-out portion 54 is cylindrical in this example. The shape of the second lead-out portion 54 is not limited to a cylindrical shape, and may be, for example, a rectangular cylindrical shape.
The flow passage cross-sectional area of the second lead-out portion 54 can be set as appropriate, and can be, for example, 100 to 2000 mm 2 . From the viewpoint of air bubble shape, intermittent aeration, uniform aeration, cleanability of the hollow fiber membrane, air supply amount (energy saving), etc., the flow passage cross-sectional area of the second lead-out part 54 is preferably 500 to 1750 mm 2 , and 750 ~1600 mm2 is more preferred.

第2導出部54の数は、この例では5本であるが、4本以下であってもよく、6本以上であってもよい。第2導出部54の数は、適宜設定でき、例えば、4~10本とすることができる。 Although the number of the second lead-out portions 54 is five in this example, it may be four or less, or may be six or more. The number of second lead-out portions 54 can be set as appropriate, and can be set to 4 to 10, for example.

散気装置10においては、第1導出部52及び複数の第2導出部54が、本体部50における長手方向の一方の端部側に偏って設けられており、本体部50の上部50aの他方の端部側に、空気供給口60が形成されている。空気供給口60は、本体部50の上部50aから上方に突き出た空気供給部62に通じており、空気供給部62はブロア1bと配管1cで繋がれている。これにより、ブロア1bから配管1cを通じて供給される空気は、空気供給口60から、本体部50の内部における第1導出部52の外側に供給されるようになっている。空気供給口60から本体部50内に供給された空気は、第1導出部52の上側から第1導出部52内に入り、各々の第2導出部54を通って上側開口端54aから本体部50の外部に放出される。 In the air diffuser 10, the first lead-out portion 52 and the plurality of second lead-out portions 54 are provided biased toward one end side in the longitudinal direction of the body portion 50, and the other side of the upper portion 50a of the body portion 50 is provided. An air supply port 60 is formed on the end side of the . The air supply port 60 communicates with an air supply portion 62 projecting upward from the upper portion 50a of the main body portion 50, and the air supply portion 62 is connected to the blower 1b by a pipe 1c. Thus, the air supplied from the blower 1b through the pipe 1c is supplied from the air supply port 60 to the outside of the first lead-out portion 52 inside the main body portion 50. As shown in FIG. The air supplied from the air supply port 60 into the main body 50 enters the first lead-out part 52 from the upper side of the first lead-out part 52, passes through each of the second lead-out parts 54, and enters the main body from the upper opening end 54a. 50 is released to the outside.

第1導出部52内におけるそれぞれの隣り合う第2導出部54の間には、平面視で第1導出部52内を仕切る複数の板状の仕切部56が設けられている。各仕切部56は、第1導出部52の短手方向の一方の側壁52aの内面から他方の側壁52bの内面まで達するように設けられている。仕切部56の下端56bは第1導出部52の下部に接している。このように、散気装置10では、第1導出部52内が平面視で長手方向に5つの領域に仕切られ、各々の領域に1本ずつ第2導出部54が入り込んでいる。 A plurality of plate-shaped partitions 56 that partition the inside of the first lead-out portion 52 in plan view are provided between the adjacent second lead-out portions 54 in the first lead-out portion 52 . Each partition portion 56 is provided so as to reach from the inner surface of one lateral side wall 52a of the first lead-out portion 52 to the inner surface of the other side wall 52b. A lower end 56 b of the partition portion 56 is in contact with the lower portion of the first lead-out portion 52 . As described above, in the air diffuser 10, the interior of the first lead-out portion 52 is divided into five regions in the longitudinal direction in plan view, and the second lead-out portion 54 is inserted into each region one by one.

第1導出部内が仕切部によって複数の領域に仕切られ、その仕切られた領域のそれぞれに第2導出部が入り込むようにすることで、間欠的な曝気が起こる際に、各々の領域に貯留されている空気が当該領域に入り込んだ第2導出部を通って放出される。このように、仕切部は、曝気の際に第1導出部内の空気が各第2導出部に均等に振り分けられるように規制する堰として機能する。これにより、曝気の際に第1導出部内の空気が特定の第2導出部に偏って吸い込まれることが抑制されるため、各々の第2導出部から均等に曝気させることができる。 The inside of the first lead-out portion is partitioned into a plurality of regions by the partition portion, and the second lead-out portion enters into each of the partitioned regions, so that when intermittent aeration occurs, it is stored in each region. The air trapped in the area is discharged through the second outlet entering the area. In this way, the partition functions as a weir that regulates the air in the first lead-out part to be evenly distributed to the respective second lead-out parts during aeration. As a result, it is possible to prevent the air in the first lead-out portion from being biased toward a specific second lead-out portion during aeration, so that the air can be uniformly aerated from each of the second lead-out portions.

本発明の散気装置では、各第2導出部から均等に曝気させやすい点から、この例のように、平面視で第1導出部内を第2導出部の本数と同じ数の領域に仕切り、それぞれの領域に1本ずつ第2導出部が入り込むようにすることが好ましい。また、この場合、各第2導出部から均等に曝気させやすい点から、第1導出部内を仕切部で各領域が均等になるように仕切ることがより好ましく、平面視で仕切られた各領域の中央に第2導出部がそれぞれ位置することがさらに好ましい。 In the air diffuser of the present invention, since it is easy to uniformly aerate from each second lead-out part, as in this example, the inside of the first lead-out part is divided into the same number of regions as the number of the second lead-out parts in plan view, It is preferable that one second lead-out portion enters into each region. Also, in this case, it is more preferable to partition the inside of the first lead-out portion so that each region is evenly divided by the partition portion in terms of facilitating uniform aeration from each of the second lead-out portions. It is further preferable that the second lead-out portions are respectively located in the center.

なお、本発明の効果を損なわない範囲であれば、第1導出部内の仕切部で仕切られた各領域の大きさは異なっていてもよい。また、第1導出部内の仕切られた各領域に入り込む第2導出部の平面視での位置が異なっていてもよい。第1導出部内における平面視で仕切部によって仕切られた1つの領域に、2本以上の第2導出部が入り込むようにしてもよい。 It should be noted that the sizes of the regions partitioned by the partitions in the first lead-out portion may be different as long as the effects of the present invention are not impaired. Further, the positions of the second lead-out portions entering the partitioned regions in the first lead-out portion in plan view may be different. Two or more second lead-out portions may enter one area partitioned by the partition in plan view in the first lead-out portion.

仕切部56の数は、この例では4個であるが、3個以下であってもよく、5個以上であってもよい。
散気装置10では、各々の第2導出部54が第1導出部52の長手方向に一列に並び、5本の第2導出部54に対して4個の仕切部56が設けられており、仕切部56の数が第2導出部54の数よりも1つ少なくなっている。本発明では、このように第1導出部に入り込む複数の第2導出部が一列に並び、第2導出部の数をn本としたとき、仕切部の数がn-1個になっていることが好ましい。これにより、各第2導出部から均等に曝気させることがさらに容易になる。
Although the number of partitions 56 is four in this example, it may be three or less, or may be five or more.
In the air diffuser 10, the respective second lead-out portions 54 are arranged in a row in the longitudinal direction of the first lead-out portions 52, and four partition portions 56 are provided for the five second lead-out portions 54, The number of partition portions 56 is one less than the number of second lead-out portions 54 . In the present invention, when the plurality of second lead-out portions entering the first lead-out portion are arranged in a row in this way, and the number of the second lead-out portions is n, the number of partition portions is n-1. is preferred. This further facilitates uniform aeration from each of the second lead-out portions.

また、仕切部56の上端56aの位置は第1導出部52の上端52cよりも高く、仕切部56の下端56bの位置は第2導出部54の下端54cよりも低くなっている。これにより、第1導出部52内に入り込んだ空気が特定の第2導出部54に偏って吸い込まれることが抑制されやすくなり、各第2導出部54からの曝気がより均等になる。 The upper end 56a of the partition portion 56 is positioned higher than the upper end 52c of the first lead-out portion 52, and the lower end 56b of the partition portion 56 is lower than the lower end 54c of the second lead-out portion 54. This makes it easier to prevent the air that has entered the first lead-out portion 52 from being biased toward a specific second lead-out portion 54, and the aeration from the respective second lead-out portions 54 becomes more uniform.

仕切部56の上端56aと第1導出部52の上端52cの上下方向の距離d1は、0.1mm以上が好ましく、1mm以上がより好ましい。距離d1が前記範囲の下限値以上であれば、各第2導出部54から均等に曝気されやすくなる。 A vertical distance d1 between the upper end 56a of the partition portion 56 and the upper end 52c of the first lead-out portion 52 is preferably 0.1 mm or more, more preferably 1 mm or more. If the distance d1 is equal to or greater than the lower limit value of the range, it becomes easy to evenly aerate from the second lead-out portions 54 .

仕切部56の下端56bと第2導出部54の下端54cの上下方向の距離d2は、0.1mm以上が好ましく、1mm以上がより好ましい。距離d2が前記範囲の下限値以上であれば、各第2導出部54から均等に曝気されやすくなる。 A vertical distance d2 between the lower end 56b of the partition portion 56 and the lower end 54c of the second lead-out portion 54 is preferably 0.1 mm or more, more preferably 1 mm or more. If the distance d2 is equal to or greater than the lower limit value of the range, it becomes easy to evenly aerate from the second lead-out portions 54 .

本体部50、第1導出部52、第2導出部54及び仕切部56の材質は、特に限定されない。例えば、ポリエチレン、ポリプロピレン、AS樹脂、ABS樹脂、アクリル樹脂(PMMA)、ポリ塩化ビニル樹脂(PVC)、ポリアセタール樹脂(POM)、ポリアミド樹脂(PA)、ポリエチレンテレフタレート樹脂(PET)、ポリブチレンテレフタレート樹脂(PBT)、ポリカーボネート樹脂(PC)、変性ポリフェニレンエーテル樹脂(PPE)、ポリフェニレンスルファイド樹脂(PPS)、ポリエーテルエーテルケトン樹脂(PEEK)、ポリスルフォン樹脂(PSf)、ポリエーテルスルフォン樹脂(PES)等が挙げられる。本体部50、第1導出部52、第2導出部54及び仕切部56の材質は、1種であってもよく、2種以上の組み合わせであってもよい。また、ステンレス(SUS304系、SUS316系)等の金属製であってもよい。 Materials for the main body portion 50, the first lead-out portion 52, the second lead-out portion 54, and the partition portion 56 are not particularly limited. For example, polyethylene, polypropylene, AS resin, ABS resin, acrylic resin (PMMA), polyvinyl chloride resin (PVC), polyacetal resin (POM), polyamide resin (PA), polyethylene terephthalate resin (PET), polybutylene terephthalate resin ( PBT), polycarbonate resin (PC), modified polyphenylene ether resin (PPE), polyphenylene sulfide resin (PPS), polyether ether ketone resin (PEEK), polysulfone resin (PSf), polyether sulfone resin (PES), etc. mentioned. The main body portion 50, the first lead-out portion 52, the second lead-out portion 54, and the partition portion 56 may be made of one kind of material or a combination of two or more kinds. It may also be made of metal such as stainless steel (SUS304 series, SUS316 series).

以下、散気装置10の作用機構について説明する。散気装置10においては、サイフォンの原理によって間欠的に曝気が起こる。
具体的には、運転開始前においては、本体部50の内部は汚泥含有処理水(被処理水)で満たされている。ブロア1bから配管1cを通じて空気を送り、空気供給部62を通じて空気供給口60から本体部50内に空気を連続的に供給すると、本体部50内の汚泥含有処理水が被処理水流入部58から押し出され、本体部50内の汚泥含有処理水の液面が次第に降下する。本体部50内の汚泥含有処理水の液面の高さが第2導出部54の下端54cよりも低くなると、第2導出部54内とサイフォン室70との2つの気液界面高さの差によって空気が第2導出部54内に吸い込まれ、第2導出部54の上側開口端54a(散気穴)から一挙に放出される。このようにして曝気が起こると、それに伴って被処理水流入部58から汚泥含有処理水が本体部50に流入し、本体部50内の汚泥含有処理水の液面の高さが第1導出部52の上端52c付近まで上昇する。そして、再び本体部50内の汚泥含有処理水の液面の高さが第2導出部54の下端54cよりも低くなったときに次の曝気が起こる。
The working mechanism of the air diffuser 10 will be described below. In the diffuser 10, aeration occurs intermittently according to the siphon principle.
Specifically, the inside of the main body 50 is filled with sludge-containing treated water (to-be-treated water) before the start of operation. When air is sent from the blower 1b through the pipe 1c and continuously supplied from the air supply port 60 into the main body 50 through the air supply part 62, the sludge-containing treated water in the main body 50 is discharged from the water inflow part 58. As a result, the liquid level of the sludge-containing treated water in the main body 50 gradually drops. When the liquid level of the sludge-containing treated water in the body portion 50 becomes lower than the lower end 54c of the second lead-out portion 54, the difference between the two gas-liquid interface heights in the second lead-out portion 54 and the siphon chamber 70 The air is sucked into the second lead-out portion 54 by the air, and is discharged from the upper open end 54a (air diffusion hole) of the second lead-out portion 54 at once. When aeration occurs in this way, sludge-containing treated water flows into the main body 50 from the water inflow part 58 to be treated, and the liquid level of the sludge-containing treated water in the main body 50 rises to the first outlet. It rises to near the upper end 52c of the portion 52 . Then, when the level of the sludge-containing treated water in the main body portion 50 becomes lower than the lower end 54c of the second lead-out portion 54 again, the next aeration occurs.

散気装置10においては、第1導出部52内が複数の仕切部56によって複数の領域に仕切られ、その仕切られた領域のそれぞれに第2導出部54が入り込んでいる。そのため、間欠的な曝気が起こる際に、第1導出部52内の仕切部56で仕切られた各領域に貯留されている空気が、それぞれその領域に入り込んでいる第2導出部54内に吸い込まれる。これにより、第1導出部52内の空気が特定の第2導出部54に偏って吸い込まれることが抑制されることで、各々の第2導出部から均等に曝気させることができる。 In the air diffuser 10, the interior of the first lead-out portion 52 is partitioned into a plurality of regions by a plurality of partitions 56, and the second lead-out portion 54 enters each of the partitioned regions. Therefore, when intermittent aeration occurs, the air stored in each region partitioned by the partition portion 56 in the first lead-out portion 52 is sucked into the second lead-out portion 54 entering the respective regions. be As a result, the air in the first lead-out portion 52 is prevented from being absorbed by a specific second lead-out portion 54, and the air can be uniformly aerated from each of the second lead-out portions.

〔水処理方法〕
以下、前記した水処理装置1000を用いた水処理方法について説明する。本実施形態の水処理方法は、活性汚泥を用いて原水を活性汚泥処理する活性汚泥処理工程と、活性汚泥処理工程で得られた汚泥含有処理水を膜分離する膜分離工程と、を有している。
[Water treatment method]
A water treatment method using the water treatment apparatus 1000 described above will be described below. The water treatment method of the present embodiment includes an activated sludge treatment process for treating raw water using activated sludge, and a membrane separation process for membrane separation of the sludge-containing treated water obtained in the activated sludge treatment process. ing.

(活性汚泥処理工程)
水処理装置1000による水処理方法では、工場や家庭等から排出された工業廃水や生活廃水等の廃水(原水)を第1の流路12を通じて活性汚泥処理槽11に流入させ、活性汚泥処理槽11で活性汚泥処理し、生物処理水とする。処理後の汚泥含有処理水(被処理水)は、第2の流路13を通じて膜分離槽21に流入させる。
(Activated sludge treatment process)
In the water treatment method using the water treatment apparatus 1000, wastewater (raw water) such as industrial wastewater and domestic wastewater discharged from factories, households, etc. is allowed to flow into the activated sludge treatment tank 11 through the first flow path 12, and Activated sludge is treated in 11 to obtain biologically treated water. The sludge-containing treated water (to-be-treated water) after treatment is made to flow into the membrane separation tank 21 through the second channel 13 .

(膜分離工程)
膜分離槽21では、MBR装置100の膜モジュール22により、活性汚泥及び生物処理水を含む汚泥含有処理水(被処理水)を膜分離処理する。膜分離処理中においては、散気装置10により曝気を行う。
(Membrane separation process)
In the membrane separation tank 21 , the membrane module 22 of the MBR device 100 membrane-separates sludge-containing treated water (water to be treated) containing activated sludge and biologically treated water. Aeration is performed by the air diffuser 10 during the membrane separation process.

汚泥含有処理水の一部は、汚泥返送手段30によって膜分離槽21から活性汚泥処理槽11に返送する。膜モジュール22により汚泥含有処理水を膜分離した後の処理水は、第3の流路33を通じて処理水槽41に送って貯留する。処理水槽41で貯留する処理水は、工業用水として再利用したり、河川等に放流したりすることができる。 A part of the sludge-containing treated water is returned from the membrane separation tank 21 to the activated sludge treatment tank 11 by the sludge return means 30 . After membrane separation of the sludge-containing treated water by the membrane module 22, the treated water is sent to the treated water tank 41 through the third channel 33 and stored therein. The treated water stored in the treated water tank 41 can be reused as industrial water or discharged into a river or the like.

なお、水処理方法は、活性汚泥処理槽11の中にMBR装置100が設けられた水処理装置を用いて、活性汚泥処理工程と膜分離工程とを同時に行ってもよい。 In the water treatment method, the activated sludge treatment process and the membrane separation process may be performed simultaneously using a water treatment apparatus in which the MBR device 100 is provided in the activated sludge treatment tank 11 .

以上説明したように、本発明では、散気装置の本体部の内部において、第1導出部内が平面視で仕切部によって複数の領域に仕切られ、各々の領域に第2導出部がそれぞれ入り込んでいる。これにより、曝気の際に第1導出部内の空気が特定の第2導出部に偏って吸い込まれ、各々の第2導出部からの曝気が不均一になることが抑制される。 As described above, in the present invention, the interior of the main body of the air diffuser is divided into a plurality of regions by the partitions in a plan view, and the second lead-out portion enters each region. there is As a result, the air in the first lead-out portion is biasedly sucked into a specific second lead-out portion during aeration, and uneven aeration from each of the second lead-out portions is suppressed.

なお、本発明の散気装置は、前記した散気装置10には限定されない。
例えば、図5に示すように、散気装置10における仕切部56の下端56bが第1導出部52の下部52dから離間した散気装置10Aであってもよい。仕切部56の下端56bが第1導出部52の下部52dから離間していても、仕切部56の下端56bの位置が第2導出部54の下端54cよりも低ければ、第1導出部52内の空気が特定の第2導出部54に偏って吸い込まれることを充分に抑制でき、各第2導出部54からの曝気が均等になる。
In addition, the air diffuser of the present invention is not limited to the air diffuser 10 described above.
For example, as shown in FIG. 5, an air diffuser 10A in which the lower end 56b of the partition portion 56 of the air diffuser 10 is separated from the lower portion 52d of the first lead-out portion 52 may be used. Even if the lower end 56b of the partition portion 56 is separated from the lower portion 52d of the first lead-out portion 52, if the position of the lower end 56b of the partition portion 56 is lower than the lower end 54c of the second lead-out portion 54, the inside of the first lead-out portion 52 of the air is sufficiently suppressed from being biased into a specific second lead-out portion 54, and the aeration from each of the second lead-out portions 54 becomes uniform.

本発明の散気装置は、複数の第2導出部が平面視で本体部の長手方向に一列に並ぶ態様には限定されず、例えば、複数の第2導出部が平面視で本体部の長手方向に二列以上に並んでいてもよい。
具体的には、図6に示すように、10本の第2導出部54が5本ずつ二列に並んだ状態で、平面視で第1導出部52内における仕切部56Aによって仕切られた10個の領域に個別に入り込んでいる態様であってもよい。仕切部56Aは、平面視で、第1導出部52の長手方向に延びる第1仕切板57aと、第1仕切板57aから第1導出部52の短手方向の一対の側壁52a,52bに向かって4つずつ延びる合計8つの第2仕切板57bとを備える。この例では、第1導出部52内は平面視で仕切部56Aによって均等な10個の領域に仕切られている。
The air diffuser of the present invention is not limited to an aspect in which the plurality of second lead-out portions are arranged in a row in the longitudinal direction of the main body in plan view. They may be arranged in two or more rows in one direction.
Specifically, as shown in FIG. 6, ten second lead-out portions 54 are arranged in two rows of five each, and the ten second lead-out portions 54 are partitioned by the partition portion 56A in the first lead-out portion 52 in plan view. It may be a mode in which each region is individually entered. The partition portion 56A includes a first partition plate 57a extending in the longitudinal direction of the first lead-out portion 52 and a pair of side walls 52a and 52b extending from the first partition plate 57a in the short direction of the first lead-out portion 52 in plan view. and a total of eight second partition plates 57b extending four by four. In this example, the interior of the first lead-out portion 52 is partitioned into ten equal regions by the partition portion 56A in a plan view.

本発明の散気装置は、第1導出部を2つ以上備え、それぞれの第1導出部内が1個以上の仕切部で複数の領域に仕切られ、それらの領域にそれぞれ第2導出部が入り込んでいるものであってもよい。
本発明の散気装置は、本体部の上部に空気供給口が形成されている態様には限定されず、例えば、本体部の側部に空気供給口が形成されている態様であってもよく、本体部の下方にブロアと繋がれた穴あきの単管等を配置し、下部の被処理水流入部が空気供給口を兼ねる態様としてもよい。
The air diffuser of the present invention includes two or more first lead-out portions, each of which is partitioned into a plurality of regions by one or more partitions, and the second lead-out portion enters each of these regions. It may be something that is
The air diffuser of the present invention is not limited to the aspect in which the air supply port is formed in the upper part of the main body, and for example, it may be the aspect in which the air supply port is formed in the side part of the main body. Alternatively, a perforated single pipe or the like connected to the blower may be arranged below the main body, and the water inlet at the bottom may also serve as an air supply port.

10…散気装置、22…膜モジュール、50…本体部、52…第1導出部、54…第2導出部、56…仕切部、58…被処理水流入部、60…空気供給口、70…サイフォン室、100…膜分離活性汚泥装置。 DESCRIPTION OF SYMBOLS 10... Air diffuser, 22... Membrane module, 50... Main-body part, 52... 1st lead-out part, 54... 2nd lead-out part, 56... Partition part, 58... Water-to-be-treated inflow part, 60... Air supply port, 70 ... siphon chamber, 100 ... membrane separation activated sludge apparatus.

Claims (5)

被処理水中で間欠的に曝気を行う散気装置であって、
被処理水中に浸漬され、内部が空洞で、下部に被処理水流入部が形成された本体部と、
前記本体部の内部に設けられ、上側が開口し、かつ、側面側及び底面側が気密に封止された第1導出部と、
前記本体部の上部から下方に延びるように設けられ、両端が開口した複数の第2導出部と、
少なくとも1つの仕切部と、を備え、
各々の前記第2導出部は、それぞれの下端が前記第1導出部の下部から離間した状態で、前記第1導出部の上側から前記第1導出部内に部分的に入り込み、
前記本体部には、前記本体部の内部における前記第1導出部の外側に空気を供給する空気供給口が形成され、
前記第1導出部内は平面視で前記仕切部によって複数の領域に仕切られ、各々の仕切られた領域に前記第2導出部がそれぞれ入り込んでおり、
前記仕切部の上端の位置が前記第1導出部の上端よりも高く、前記仕切部の下端の位置が前記第2導出部の下端よりも低い、散気装置。
An air diffuser that intermittently aerates water to be treated,
a main body that is immersed in the water to be treated, has a hollow interior, and has a water inlet portion formed at the bottom;
a first lead-out portion provided inside the main body portion, the upper side of which is open, and the side and bottom sides of which are airtightly sealed;
a plurality of second lead-out portions extending downward from the upper portion of the main body and having both ends open;
at least one partition;
each of the second lead-out portions partially enters into the first lead-out portion from the upper side of the first lead-out portion with the lower end of each of the second lead-out portions being separated from the lower portion of the first lead-out portion;
The main body portion is formed with an air supply port for supplying air to the outside of the first lead-out portion inside the main body portion,
The inside of the first lead-out portion is partitioned into a plurality of regions by the partition portion in a plan view, and the second lead-out portion enters into each of the partitioned regions ,
The air diffuser , wherein the upper end of the partition is higher than the upper end of the first lead-out portion, and the lower end of the partition is lower than the lower end of the second lead-out portion .
前記第1導出部内の平面視で前記仕切部によって仕切られた複数の領域に、それぞれ1本ずつ前記第2導出部が入り込んでいる、請求項1に記載の散気装置。 2. The air diffuser according to claim 1, wherein one of said second lead-out portions enters each of a plurality of regions partitioned by said partition portion in plan view inside said first lead-out portion. 前記本体部が直方体状で、前記の複数の第2導出部が平面視で前記本体部の長手方向に互いに間隔を空けて並んで設けられている、請求項1又は2に記載の散気装置。 The air diffuser according to claim 1 or 2, wherein the main body has a rectangular parallelepiped shape, and the plurality of second lead-out portions are arranged side by side at intervals in the longitudinal direction of the main body in a plan view. . 前記の複数の第2導出部が平面視で前記本体部の長手方向に一列に並び、前記第2導出部の数をn本としたとき、前記仕切部の数がn-1個である、請求項3に記載の散気装置。 When the plurality of second lead-out portions are arranged in a row in the longitudinal direction of the main body in a plan view, and the number of the second lead-out portions is n, the number of the partition portions is n-1. The air diffuser according to claim 3. 活性汚泥を含む汚泥含有処理水を膜分離する膜モジュールと、
請求項1~のいずれか一項に記載の散気装置と、を備える膜分離活性汚泥装置。
a membrane module for membrane separation of sludge-containing treated water containing activated sludge;
A membrane separation activated sludge apparatus comprising the air diffuser according to any one of claims 1 to 4 .
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