JPH0431757B2 - - Google Patents
Info
- Publication number
- JPH0431757B2 JPH0431757B2 JP62307825A JP30782587A JPH0431757B2 JP H0431757 B2 JPH0431757 B2 JP H0431757B2 JP 62307825 A JP62307825 A JP 62307825A JP 30782587 A JP30782587 A JP 30782587A JP H0431757 B2 JPH0431757 B2 JP H0431757B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- ventilation resistance
- diffuser plate
- diffuser
- air diffuser
- 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.)
- Expired - Lifetime
Links
- 238000009423 ventilation Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 10
- 238000005273 aeration Methods 0.000 description 21
- 238000004140 cleaning Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は下水処理場の曝気槽内に設置され汚水
中に空気を吹込むために使用されている散気板や
デイフユーザーのような散気装置の目詰り防止方
法に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to an aeration plate or a diffuser installed in an aeration tank of a sewage treatment plant and used to blow air into wastewater. The present invention relates to a method for preventing clogging of an apparatus.
（従来の技術）
下水処理場の曝気槽内には散気装置として例え
ば多孔質のセラミツク材などからなる散気板が設
置され、そのホルダーに形成された空気室から供
給される空気を細かい気泡として汚水中に散気
し、好気性菌体による活性汚泥処理が能率良く行
われるようになつている。ところがこのような散
気装置は汚水及び活性汚泥に常時接触しているた
めに長期間使用しているとこれらの汚れが散気装
置の表面に付着したりその内部に侵入し、次第に
目詰りを引起こして通気抵抗が増加し、ついには
散気不能な状態に至る。このため従来から定期的
に散気装置を曝気槽内から引上げ、手作業により
洗浄して汚れを除去したり新しい散気装置と交換
する作業を行つているが、そのためには長時間に
わたり曝気を停止しなければならず、また作業量
が多大なものとなる等の欠点があつた。(Prior art) An aeration plate made of, for example, porous ceramic material is installed as an aeration device in the aeration tank of a sewage treatment plant, and the air supplied from the air chamber formed in the holder is converted into fine bubbles. As a result, activated sludge treatment using aerobic bacteria can be carried out efficiently by diffusing air into wastewater. However, since such air diffusers are in constant contact with sewage and activated sludge, if they are used for a long period of time, these dirt will adhere to the surface of the air diffuser or penetrate into its interior, causing it to gradually become clogged. This causes an increase in ventilation resistance, eventually leading to a state where aeration becomes impossible. For this reason, the air diffuser has traditionally been periodically pulled out of the aeration tank and manually cleaned to remove dirt or replaced with a new one, but this requires continuous aeration for a long period of time. There were drawbacks such as the need to stop and the amount of work required.
（発明が解決しようとする問題点）
本発明はこのような従来の問題点を解決して、
散気装置の通気抵抗を簡便に回復させることがで
き、しかもこの間にも散気を継続して行うことが
できる散気装置の目詰り防止方法を目的として完
成されたものである。(Problems to be solved by the invention) The present invention solves these conventional problems,
This method was completed with the aim of providing a method for preventing clogging of an air diffuser that can easily restore the ventilation resistance of the air diffuser and also allow continuous air diffusion during this period.
（問題点を解決するための手段）
本発明は下面に空気室を備えた散気装置を定期
的に、あるいは通気抵抗が増加した際に空気室が
上面に来るように反転させ、散気装置の下面から
空気を噴出させることにより散気装置の表面に付
着した汚れを除去することを特徴とするものであ
る。(Means for Solving the Problems) The present invention provides an air diffuser that is equipped with an air chamber on the lower surface and is inverted so that the air chamber is on the upper surface periodically or when ventilation resistance increases. It is characterized by removing dirt attached to the surface of the air diffuser by blowing air out from the bottom surface of the air diffuser.
以下に本発明を図面を参照しつつ更に詳細に説
明すると、第１図及び第２図に示す実施例におい
て、(1)は曝気槽、(2)はその底面に設置された散気
装置の代表例としての散気板である。本実施例に
おいては散気板２は多孔質のセラミツク板からな
るもので、その下面にはホルダを兼ねる空気室３
が形成されている。これらの空気室３には空気管
４，５を介して圧縮空気が供給され、常時は散気
板２の表面から汚水中に散気を行つている。また
この空気管５には圧力検出装置１０が設置されて
おり、散気板２の通気抵抗が監視されている。 The present invention will be explained in more detail below with reference to the drawings. In the embodiment shown in FIGS. 1 and 2, (1) is an aeration tank, and (2) is an aeration device installed on the bottom of the This is a diffuser plate as a typical example. In this embodiment, the air diffuser plate 2 is made of a porous ceramic plate, and an air chamber 3 that also serves as a holder is provided on the bottom surface of the air diffuser plate 2.
is formed. Compressed air is supplied to these air chambers 3 through air pipes 4 and 5, and air is normally diffused into the waste water from the surface of the diffuser plate 2. Further, a pressure detection device 10 is installed in the air pipe 5, and the ventilation resistance of the air diffuser plate 2 is monitored.
第２図に明示されるように、散気板２と空気室
３とを取付けた空気管４はその端部がロータリジ
ヨイント６を介して垂直な空気管５を分岐した端
部に回転自在に接続されており、また各空気管４
の端部に設けられたスプロケツト７がチエーン８
によつて相互に連結されるとともに、中央の空気
管４が水中駆動モータ９によつて回転できる構造
となつている。そして圧力検出装置１０によつて
検出された散気板２の通気抵抗が所定値まで増加
した際に、この水中駆動モータ９を作動させて各
空気管４とともに全散気板２を空気室３が上面に
来るように反転させる。このように反転状態のま
ま空気室３から散気板２に圧縮空気を供給すれ
ば、空気は下向きになつた散気板２の表面から気
泡となつて水中に押出されて散気板２の表面に沿
つて周辺に向つて流れることとなり、このときに
表面に付着していた汚れなどを散気板２の表面か
ら除去することができる。このように本発明によ
れば散気を継続しつつ散気板２の表面洗浄を行う
ことができる。このとき、空気噴出量を通常時の
150〜300％に増加させれば、散気板２の内部に侵
入した汚れまで洗浄することができるので、更に
好ましい結果を得ることができる。 As clearly shown in FIG. 2, the air pipe 4 to which the air diffuser plate 2 and the air chamber 3 are attached is rotatable at its end, which branches off from the vertical air pipe 5 via the rotary joint 6. and each air pipe 4
The sprocket 7 provided at the end of the chain 8
The central air pipe 4 is connected to each other by a submersible drive motor 9 and can be rotated by a submersible drive motor 9. When the ventilation resistance of the air diffuser plate 2 detected by the pressure detection device 10 increases to a predetermined value, the submersible drive motor 9 is operated to move all the air diffuser plates 2 together with each air pipe 4 into the air chamber 3. Flip it so that it is on top. If compressed air is supplied from the air chamber 3 to the air diffuser plate 2 in this inverted state, the air will become bubbles from the downward facing surface of the air diffuser plate 2 and be pushed out into the water. The air flows along the surface toward the periphery, and at this time, dirt and the like adhering to the surface can be removed from the surface of the air diffuser plate 2. As described above, according to the present invention, the surface of the air diffuser plate 2 can be cleaned while continuing air diffusion. At this time, adjust the air jet amount to the normal
If the amount is increased to 150 to 300%, even the dirt that has entered the interior of the air diffuser plate 2 can be cleaned, so more favorable results can be obtained.
なお散気板２を反転させる方法はこれに限定さ
れるものではなく、曝気槽１の水面上からチエー
ン等によつて散気板２を空気管４のまわりに反転
させてもよく、また旋回流方式曝気槽のように槽
幅の片側のみに配置されている場合には一旦散気
板２を水面上へ引上げたうえで反転させ、再び水
中に沈める方法など種々の反転方法を採用するこ
とができる。なお水中駆動モータ９と圧力検出装
置１０とを電気的に接続し、洗浄開始圧力を例え
ば正常時の50〜70％増加、あるいは50mmAq増
加等に設定しておき、通気抵抗がこの値を越えた
ときに自動洗浄を開始させるようにすることもで
きる。 Note that the method for inverting the air diffuser plate 2 is not limited to this, and the air diffuser plate 2 may be inverted around the air pipe 4 using a chain or the like from above the water surface of the aeration tank 1, or may be rotated. If the aeration tank is placed on only one side of the width of the tank, such as a flow type aeration tank, various inversion methods can be used, such as a method in which the diffuser plate 2 is first raised above the water surface, then inverted, and submerged in the water again. I can do it. The submersible drive motor 9 and the pressure detection device 10 are electrically connected, and the cleaning start pressure is set to, for example, a 50 to 70% increase in normal pressure, or a 50 mmAq increase, so that the ventilation resistance exceeds this value. Automatic cleaning can also be started from time to time.
第３図は本発明方法において、洗浄時間と洗浄
通気量を変化させた場合の散気板２の湿式通気抵
抗の変化を示したグラフである。洗浄は２週間に
一回ずつ15分、30分、60分の割合で実施され、活
性汚泥濃度1200mg／、曝気時間６時間、１枚当
りの通気量80／分で下水処理を行つている曝気
槽を用いて１年間にわたりテストされた。テスト
中の通気抵抗測定は散気板２を槽内から取出し、
第６図に示される通気抵抗測定装置により湿式通
気抵抗を測定する方法で行つた。散気板２は１回
の測定につきホルダー６枚中２枚を１枚ずつ測定
し、平均値を採用した。算出式は次のとおりであ
る。 FIG. 3 is a graph showing changes in the wet ventilation resistance of the air diffuser plate 2 when the cleaning time and cleaning ventilation amount are changed in the method of the present invention. Cleaning is carried out once every two weeks for 15 minutes, 30 minutes, and 60 minutes, and the activated sludge concentration is 1200 mg/minute, the aeration time is 6 hours, and the aeration rate per plate is 80 minutes per minute. It was tested over a period of one year using a tank. To measure ventilation resistance during the test, remove the diffuser plate 2 from the tank.
The wet ventilation resistance was measured using the ventilation resistance measuring device shown in FIG. For the air diffuser plate 2, two out of six holders were measured one by one, and the average value was used. The calculation formula is as follows.
ΔP＝ΔP1−50（水深分）
ここで、
ΔP：散気板の通気抵抗（mmAq）
ΔP1：水深分を含んだ通気抵抗値（mmAq）
第３図からも明らかなように、１回当りの洗浄
時間が長く、しかも通気量の多い方が散気板２の
通気抵抗の増加が少なく優れた洗浄効果が得られ
ることとなる。洗浄時間は15分間では不十分であ
るが30分以上では時間延長の割には効果が少な
く、実用的には60分以上洗浄することはあまり意
味がない。また通気量は多い程好ましいのである
が、実設備で通常の散気に用いられているブロア
の能力の範囲内で十分な効果が得られる。 ΔP=ΔP 1 −50 (water depth) Where, ΔP: Ventilation resistance of the diffuser plate (mmAq) ΔP 1 : Ventilation resistance value including water depth (mmAq) As is clear from Figure 3, once The longer the cleaning time per cleaning and the greater the amount of ventilation, the less the increase in ventilation resistance of the air diffuser plate 2 and the better the cleaning effect. A cleaning time of 15 minutes is insufficient, but a cleaning time of 30 minutes or more is less effective in spite of the extended time, and it is practically meaningless to wash for more than 60 minutes. Although it is preferable to increase the amount of ventilation, sufficient effects can be obtained within the capacity of the blower normally used in actual equipment.
第４図は洗浄回数を変化させた場合の散気板２
の湿式通気抵抗の変化を示したグラフであり、下
水処理におけるテスト条件は第３図について説明
したと同一である。このように無洗浄の場合には
１年間で通気抵抗が新品の約２倍にまで上昇した
が、月１回の洗浄では上昇率は約50％、２週間に
１回の洗浄では約30％、週１回洗浄を行えばわず
か15％となり、優れた洗浄効果が確認された。 Figure 4 shows the air diffuser plate 2 when the number of cleanings is changed.
3 is a graph showing the change in wet ventilation resistance of sewage treatment, and the test conditions in sewage treatment are the same as those described in connection with FIG. 3. In this way, in the case of no cleaning, the ventilation resistance increased to about twice that of a new product in one year, but when washed once a month, the increase rate was about 50%, and when washed once every two weeks, the increase was about 30%. However, when washed once a week, the cleaning effect was only 15%, confirming the excellent cleaning effect.
なお第５図は散気板２の通気抵抗増加と消費電
力増加の関係を示したグラフである。このグラフ
からも明らかなように、通気抵抗の増加に伴い消
費電力は著しく増加することとなるので、本発明
の方法によつて通気抵抗の増加を例えば
50mmAq以下に抑えれば電力費の増加を１％以
下に抑制することができる。 Note that FIG. 5 is a graph showing the relationship between the increase in ventilation resistance of the diffuser plate 2 and the increase in power consumption. As is clear from this graph, power consumption increases significantly as ventilation resistance increases, so the method of the present invention can reduce the increase in ventilation resistance, for example.
If you keep it below 50mmAq, you can keep the increase in power costs below 1%.
（発明の効果）
本発明は以上の説明からも明らかなように、単
に散気装置を反転させるだけで表面に付着した汚
れを除去し、通気抵抗を減少させることができる
ものであり、実施例のように水中で反転を行わせ
れば曝気槽を稼働させたままで洗浄が可能であ
り、また水中から散気装置を引上げて反転させる
場合でも作業時間はごく短時間で十分であつて従
来のように長時間にわたり曝気槽を停止する必要
はない。従つて本発明は下水処理場等において実
施するに適した散気装置の目詰り防止方法とし
て、産業の発展に寄与するところは極めて大きい
ものである。(Effects of the Invention) As is clear from the above description, the present invention is capable of removing dirt attached to the surface and reducing ventilation resistance by simply reversing the air diffuser. If the aeration tank is turned over underwater as shown in the figure above, it is possible to clean the aeration tank while it is in operation.Also, even when the aeration tank is pulled up from the water and turned over, the work time is very short and is sufficient compared to conventional methods. There is no need to stop the aeration tank for a long time. Therefore, the present invention greatly contributes to the development of industry as a method for preventing clogging of air diffusers suitable for implementation in sewage treatment plants and the like.
第１図は本発明に用いられる曝気槽を示す断面
図、第２図は散気装置の反転部を示す斜視図、第
３図と第４図は本発明の効果を示すグラフ、第５
図は通気抵抗の増加と消費電力の増加との関係を
示すグラフ、第６図は通気抵抗測定装置を示す断
面図である。
２……散気装置の代表例としての散気板、３…
…空気室。
FIG. 1 is a sectional view showing an aeration tank used in the present invention, FIG. 2 is a perspective view showing an inverted part of the aeration device, FIGS. 3 and 4 are graphs showing the effects of the present invention, and FIG.
The figure is a graph showing the relationship between the increase in ventilation resistance and the increase in power consumption, and FIG. 6 is a sectional view showing the ventilation resistance measuring device. 2... Diffuser plate as a typical example of a diffuser, 3...
...Air chamber.
Claims (1)
あるいは通気抵抗が増加した際に空気室が上面に
来るように反転させ、散気装置の下面から空気を
噴出させることにより散気装置の表面に付着した
汚れを除去することを特徴とする散気装置の目詰
り防止方法。 ２ 反転時の空気噴出量を通常時の150〜300％と
する特許請求の範囲第１項記載の散気装置の目詰
り防止方法。[Claims] 1. Periodically install an air diffuser equipped with an air chamber on the lower surface,
Alternatively, when ventilation resistance increases, the air diffuser is inverted so that the air chamber is on the top surface, and air is ejected from the bottom surface of the diffuser to remove dirt attached to the surface of the diffuser. How to prevent clogging of equipment. 2. The method for preventing clogging of an air diffuser according to claim 1, wherein the amount of air ejected during reversal is 150 to 300% of the normal amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307825A JPH01148397A (en) | 1987-12-04 | 1987-12-04 | Method for preventing blocking of diffuser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62307825A JPH01148397A (en) | 1987-12-04 | 1987-12-04 | Method for preventing blocking of diffuser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01148397A JPH01148397A (en) | 1989-06-09 |
| JPH0431757B2 true JPH0431757B2 (en) | 1992-05-27 |
Family
ID=17973661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62307825A Granted JPH01148397A (en) | 1987-12-04 | 1987-12-04 | Method for preventing blocking of diffuser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01148397A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6550747B2 (en) | 1998-10-09 | 2003-04-22 | Zenon Environmental Inc. | Cyclic aeration system for submerged membrane modules |
| JP4502856B2 (en) * | 2005-03-24 | 2010-07-14 | メタウォーター株式会社 | Method for preventing clogging of air diffuser and method for operating air diffuser using this method |
| JP5955745B2 (en) * | 2012-10-31 | 2016-07-20 | 三機工業株式会社 | Swirl aeration tank |
-
1987
- 1987-12-04 JP JP62307825A patent/JPH01148397A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01148397A (en) | 1989-06-09 |
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