JPH09164396A - Diffuser plate - Google Patents
Diffuser plateInfo
- Publication number
- JPH09164396A JPH09164396A JP7327314A JP32731495A JPH09164396A JP H09164396 A JPH09164396 A JP H09164396A JP 7327314 A JP7327314 A JP 7327314A JP 32731495 A JP32731495 A JP 32731495A JP H09164396 A JPH09164396 A JP H09164396A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- diffuser plate
- uniformly
- ruggednesses
- unevenness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水処理場等のエ
アレーションタンクに使用される散気板の改良に関する
ものである。TECHNICAL FIELD The present invention relates to an improvement of a diffuser plate used in an aeration tank of a sewage treatment plant or the like.
【０００２】[0002]
【従来の技術】従来、下水処理はＢＯＤ除去のレベルに
とどまっていたが、近年における下水処理の高度化によ
り、窒素除去（硝化・脱窒）まで行なうことが必要とさ
れるようになった。このため、硝化のための供給酸素量
を増加させることが要求され、散気板の気孔径を小さく
して気泡を細かくしたり、全面配置して酸素溶解効率を
高める工夫がなされている。2. Description of the Related Art Conventionally, sewage treatment has been limited to the level of BOD removal, but due to the advanced sewage treatment in recent years, it has become necessary to perform nitrogen removal (nitrification / denitrification). For this reason, it is required to increase the amount of oxygen supplied for nitrification, and various measures have been taken to reduce the pore diameter of the diffuser plate to make the bubbles finer or to arrange the entire surface to enhance the oxygen dissolution efficiency.
【０００３】ところが、技術的、経済的な観点から散気
板の気孔径をあまり小さくすることは得策ではない。即
ち、散気板の気孔径を小さくすると目詰まりの問題や、
ブロワに過大な負担がかかるという問題がある。従っ
て、気孔径を小さくする方法には限界がある。また、気
孔径を一定としたままで散気板の通気量を増加させて
も、単に水中における気泡径が大きくなるだけで、酸素
溶解効率は低下する。従って、従来の散気板を用いたエ
アレーションタンクでは、下水への供給酸素量を増加さ
せるためには散気板の設置枚数を増加させるしか有効な
手段がないが、エアレーションタンクの面積により制約
を受けるため、散気板の設置が困難なことも多い。However, from a technical and economical point of view, it is not a good idea to make the pore size of the diffuser plate too small. That is, if the pore size of the diffuser plate is reduced, the problem of clogging,
There is a problem that the blower is overloaded. Therefore, there is a limit to the method for reducing the pore size. Further, even if the ventilation volume of the diffuser plate is increased while the pore diameter is kept constant, the oxygen dissolution efficiency is lowered only by increasing the bubble diameter in water. Therefore, in the aeration tank using the conventional air diffuser, the only effective means to increase the amount of oxygen supplied to the sewage is to increase the number of air diffusers installed, but there are restrictions due to the area of the aeration tank. Because of this, it is often difficult to install the diffuser plate.
【０００４】また、下水処理場の供用開始初期において
は流入下水量が計画水量よりも少ない。しかし散気板は
計画水量に対応させて設置されている。このため、供用
開始初期においては散気板の通気量をかなり絞って運転
せざるを得ない。ところが通気量を絞ると散気板の中で
の気泡の吹き出し位置が不均一になり易く、それに伴っ
て汚泥が散気板の表面に堆積し、目詰まりの原因となる
という問題もあった。In addition, the amount of inflowing sewage is smaller than the planned amount of water at the beginning of the operation of the sewage treatment plant. However, the diffuser plate is installed according to the planned water volume. For this reason, at the beginning of service, it is inevitable that the diffuser plate is operated with a considerably reduced air flow rate. However, when the air flow rate is reduced, there is also a problem in that the position of air bubbles in the diffuser plate is likely to be non-uniform, and along with that, sludge accumulates on the surface of the diffuser plate, causing clogging.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、従来品よりも下水への供給酸素量を
増加させることができ、また通気量を絞った場合にも吹
き出し位置の不均一や目詰まりを生じにくい散気板を提
供するためになされたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and can increase the amount of oxygen supplied to the sewage as compared with the conventional product, and the blowing position can be achieved even when the ventilation amount is reduced. The purpose of the present invention is to provide a diffuser plate that is less likely to cause unevenness and clogging.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、多孔質の板状体の表面に、多数
の凹凸を均一に形成配置したことを特徴とするものであ
る。なお、前記凹凸の高さが、平均粒子径の５倍以上で
あり、かつ板状体の厚みの1/6 〜1/3 の範囲としておく
ことが好ましい。The present invention made to solve the above-mentioned problems is characterized in that a large number of irregularities are uniformly formed and arranged on the surface of a porous plate-like body. . The height of the irregularities is preferably 5 times or more the average particle diameter, and is preferably in the range of 1/6 to 1/3 of the thickness of the plate-shaped body.
【０００７】[0007]
【発明の実施の形態】以下に本発明の好ましい実施の形
態を、図面を参照しつつ説明する。図１は本発明の散気
板の一部の縦断面図であり、１は散気板を構成する多孔
質の板状体、２はその表面に形成された多数の凹凸であ
る。多孔質の板状体１は、磁器、合成樹脂等材料は種々
のものが利用でき、種々の形状があるが、一般的には矩
形または円形のものが多い。セラミック粒子をバインダ
ーとともに焼結した例では、平均粒子径は0.5 〜２mm程
度が普通である。またその場合の気孔径は260 〜400 μ
m 程度である。一般にこの板状体１は厚みが30mmであ
り、長さ×幅は300mm ×300mm 、または100mm ×300mm
のものが普通である。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a part of the air diffusing plate of the present invention, in which 1 is a porous plate-like body forming the air diffusing plate, and 2 is a large number of irregularities formed on the surface thereof. As the porous plate-shaped body 1, various materials such as porcelain and synthetic resin can be used, and there are various shapes, but generally, they are rectangular or circular. In an example in which ceramic particles are sintered together with a binder, the average particle diameter is usually about 0.5 to 2 mm. In that case, the pore size is 260-400 μ.
It is about m. Generally, this plate-like body 1 has a thickness of 30 mm, and length x width is 300 mm x 300 mm, or 100 mm x 300 mm.
The ones are normal.
【０００８】発泡を均等に行なわせるためには、凹凸２
は板状体１の全面にできるだけ均等に形成配置すること
が好ましく、このためには細かい凹凸２を多数均一に設
けることが好ましい。しかし、散気板の発泡面積を増加
させるためには、できるだけ凹凸２の高さ（深さ）は大
きいことが好ましいが、それと同時に発泡した気体の合
一を避ける必要がある。そこで両方の要求を満足するた
めに、凹凸２の高さは５〜10mm程度、凹凸２の平面方向
のピッチは５〜15mm程度、凹凸の角度は30〜60°前後と
することが好ましい。In order to make the foaming even, the unevenness 2
Is preferably formed and arranged as uniformly as possible on the entire surface of the plate-like body 1. For this purpose, it is preferable to provide a large number of fine irregularities 2 uniformly. However, in order to increase the foaming area of the diffuser plate, it is preferable that the height (depth) of the unevenness 2 is as large as possible, but at the same time, it is necessary to avoid coalescence of the foamed gas. Therefore, in order to satisfy both requirements, it is preferable that the height of the unevenness 2 is about 5 to 10 mm, the pitch of the unevenness 2 in the plane direction is about 5 to 15 mm, and the angle of the unevenness is about 30 to 60 °.
【０００９】また粒子径との関係では、凹凸２の高さは
平均粒子径の５倍以上であることが好ましく、これより
も凹凸２の高さが小さいと本発明の効果を十分に発揮さ
せることができない。一方、凹凸２の高さは板状体１の
厚みの1/6 〜1/3の範囲としておくことが好ましい。こ
れは凹凸２の高さが板状体１の厚みの1/6よりも小さい
と本発明の効果を十分に発揮させることができず、1/3
を越えると板状体１の機械的強度の低下を招くためであ
る。In relation to the particle size, it is preferable that the height of the unevenness 2 is 5 times or more the average particle size. If the height of the unevenness 2 is smaller than this, the effect of the present invention can be sufficiently exhibited. I can't. On the other hand, the height of the unevenness 2 is preferably set in the range of 1/6 to 1/3 of the thickness of the plate-shaped body 1. This is because if the height of the unevenness 2 is smaller than 1/6 of the thickness of the plate-shaped body 1, the effect of the present invention cannot be sufficiently exerted, and
This is because the mechanical strength of the plate-shaped body 1 is deteriorated when it exceeds.
【００１０】図１の例では凹凸２の斜面は直線状とした
が、適当な丸みを設けてもよい。また凹凸２はそれぞれ
が独立したものとすることが好ましいが、多数の平行な
Ｖ溝を板状体１の表面に形成することにより、三角山状
の連続した凹凸を形成してもよい。さらに図２に示すよ
うに、凹凸２の上下に平面部３を設けてもよいが、表面
積をかせぐためにできる限り狭くすることが好ましい。In the example of FIG. 1, the slope of the unevenness 2 is linear, but it may be provided with an appropriate roundness. Further, it is preferable that the unevennesses 2 are independent of each other, but a plurality of parallel V-shaped grooves may be formed on the surface of the plate-shaped body 1 to form continuous triangular mountain-shaped unevenness. Further, as shown in FIG. 2, flat portions 3 may be provided above and below the unevenness 2, but it is preferable that the flat portions 3 are made as narrow as possible in order to increase the surface area.
【００１１】このように構成された本発明の散気板は、
汚水と接触する表面積が凹凸２により増加するので、平
面積が同一であっても汚水への供給空気量を従来よりも
50％程度増加させることができる。また通気量を絞った
場合には通気抵抗の少ない凹凸２の底部から発泡が行な
われるが、本発明によれば凹凸２は散気板の全面に均等
に形成配置されているために、みかけ上は散気板の全面
から均等に発泡することとなり、従来品のように吹き出
し位置が不均一となることはない。The air diffusing plate of the present invention thus constructed is
Since the surface area in contact with sewage increases due to the unevenness 2, the amount of air supplied to sewage is greater than in the past even if the flat area is the same.
It can be increased by about 50%. Further, when the ventilation amount is narrowed, foaming is performed from the bottom of the unevenness 2 having a small ventilation resistance, but according to the present invention, since the unevenness 2 is formed and arranged evenly over the entire surface of the air diffusing plate, the appearance is apparent. Will uniformly foam from the entire surface of the diffuser plate, and the blowing position will not be uneven as in the conventional product.
【００１２】しかも図２のように凹凸２の底部から吹き
出した気泡が上昇する際に、汚水が乱流状態となって底
面及び斜面に堆積した汚泥を剥離し、上昇流に伴って凹
凸２から除去することができる。このために汚泥の堆積
による目詰まりを防止することができる。Moreover, as shown in FIG. 2, when the bubbles blown from the bottom of the unevenness 2 rise, the sewage becomes a turbulent state and the sludge accumulated on the bottom surface and the slope is peeled off, and the ascending flow causes the unevenness 2 to be removed. Can be removed. Therefore, clogging due to sludge accumulation can be prevented.
【００１３】[0013]
【実施例】平均粒子径が１mmのセラミック粒子を重量比
で５％のガラス質バインダーと混合し、成形型を利用し
て振動成形したうえ焼成し、厚みが30mmで長さ×幅が30
0mm ×300mm 、及び100mm ×300mm の２種類の散気板を
製作した。なお、その表面には成形型を利用して、高さ
が８mm、平面方向のピッチが15mmのピラミッド状の凹凸
を均等に形成した。この場合、凹凸の高さは平均粒子径
の７倍であり、散気板の厚みの約1/4 である。[Examples] Ceramic particles having an average particle diameter of 1 mm were mixed with a glassy binder having a weight ratio of 5%, vibration-molded using a molding die, and fired to obtain a thickness of 30 mm and a length × width of 30.
Two types of diffuser plates of 0 mm x 300 mm and 100 mm x 300 mm were manufactured. A pyramid-shaped concavo-convex having a height of 8 mm and a pitch in the plane direction of 15 mm was uniformly formed on the surface by using a molding die. In this case, the height of the irregularities is 7 times the average particle diameter, which is about 1/4 of the thickness of the diffuser plate.
【００１４】これらの散気板を表面が平坦な従来品とと
もにエアレーションタンク内に設置し、ブロワから圧縮
空気を通気して発泡状態を観察しつつ、使用可能な通気
量の範囲を測定した。その結果、300mm ×300mm のサイ
ズのものは従来品では使用可能な通気量の範囲は80〜10
0L/minであったが、本発明品では50〜150L/minにまで拡
大された。また、100mm ×300mm のサイズのものは従来
品では使用可能な通気量の範囲は20〜40L/min であった
が、本発明品では10〜60L/min にまで拡大された。These diffusing plates were installed in an aeration tank together with a conventional product having a flat surface, and compressed air was ventilated from a blower to observe the foaming state, and the range of usable ventilation amount was measured. As a result, the 300 mm x 300 mm size has a usable air flow range of 80 to 10 with the conventional product.
Although it was 0 L / min, the product of the present invention was expanded to 50 to 150 L / min. Further, in the case of the size of 100 mm × 300 mm, the range of the air flow rate which can be used in the conventional product was 20 to 40 L / min, but it was expanded to 10 to 60 L / min in the product of the present invention.
【００１５】[0015]
【発明の効果】上記の実施例からも明らかなように、本
発明の散気板は表面に凹凸を設けたことにより通気量が
低い範囲から高い範囲まで均等に発泡させることがで
き、下水処理場の供用開始初期においても、また硝化対
応の高通気量時にも使用することができる。さらに本発
明の散気板は、通気量を絞った場合にも汚泥の堆積によ
る目詰まりを生じにくい。As is apparent from the above examples, the diffuser plate of the present invention can be uniformly foamed from a low ventilation range to a high ventilation range by providing irregularities on the surface, and sewage treatment. It can be used even in the initial stage of in-service use, or at a high aeration amount corresponding to nitrification. Further, the air diffuser plate of the present invention is unlikely to cause clogging due to sludge accumulation even when the ventilation amount is reduced.
【図１】本発明の散気板の部分断面図である。FIG. 1 is a partial cross-sectional view of an air diffuser plate of the present invention.
【図２】本発明の効果を説明する拡大断面図である。FIG. 2 is an enlarged sectional view illustrating an effect of the present invention.
１ 板状体、２ 凹凸、３ 平面部 1 plate-like body, 2 unevenness, 3 plane part
Claims (2)
均一に形成配置したことを特徴とする散気板。1. A diffuser plate, characterized in that a large number of irregularities are uniformly formed and arranged on the surface of a porous plate-like body.
あり、かつ板状体の厚みの1/6 〜1/3 の範囲にある請求
項１記載の散気板。2. The diffuser plate according to claim 1, wherein the height of the irregularities is not less than 5 times the average particle diameter and is in the range of 1/6 to 1/3 of the thickness of the plate-shaped body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7327314A JPH09164396A (en) | 1995-12-15 | 1995-12-15 | Diffuser plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7327314A JPH09164396A (en) | 1995-12-15 | 1995-12-15 | Diffuser plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09164396A true JPH09164396A (en) | 1997-06-24 |
Family
ID=18197762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7327314A Withdrawn JPH09164396A (en) | 1995-12-15 | 1995-12-15 | Diffuser plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09164396A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003266093A (en) * | 2002-03-14 | 2003-09-24 | Ngk Insulators Ltd | Regenerable air diffusion plate |
| JP2013236981A (en) * | 2012-05-11 | 2013-11-28 | Sumitomo Heavy Industries Environment Co Ltd | Air diffuser |
| CN107500424A (en) * | 2017-09-13 | 2017-12-22 | 上海然庆环境科技有限公司 | A kind of multiphase flow diffuses air-dissolving apparatus |
-
1995
- 1995-12-15 JP JP7327314A patent/JPH09164396A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003266093A (en) * | 2002-03-14 | 2003-09-24 | Ngk Insulators Ltd | Regenerable air diffusion plate |
| JP2013236981A (en) * | 2012-05-11 | 2013-11-28 | Sumitomo Heavy Industries Environment Co Ltd | Air diffuser |
| CN107500424A (en) * | 2017-09-13 | 2017-12-22 | 上海然庆环境科技有限公司 | A kind of multiphase flow diffuses air-dissolving apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030304 |