JPH0938685A - Deep zone aeration tank - Google Patents
Deep zone aeration tankInfo
- Publication number
- JPH0938685A JPH0938685A JP7208562A JP20856295A JPH0938685A JP H0938685 A JPH0938685 A JP H0938685A JP 7208562 A JP7208562 A JP 7208562A JP 20856295 A JP20856295 A JP 20856295A JP H0938685 A JPH0938685 A JP H0938685A
- Authority
- JP
- Japan
- Prior art keywords
- aeration tank
- tank
- aeration
- carrier
- deep
- 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.)
- Granted
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、深層曝気槽に係
り、特に下水・し尿・産業排水などに含まれるＢＯＤあ
るいは窒素を、流動させた微生物固定化担体を利用して
生物学的に処理する深層曝気槽に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep aeration tank, and in particular, biologically treats BOD or nitrogen contained in sewage, night soil, industrial wastewater, etc. using a fluidized microorganism-immobilized carrier. Regarding deep aeration tank.
【０００２】[0002]
【従来の技術】近年、活性汚泥法、生物膜法、固定化微
生物法などの普及が著しいが、国内においては省面積で
処理が可能な高性能汚水処理装置の開発が急務である。
これらの中で微生物固定化担体を利用する汚水処理装置
は、槽内の微生物濃度を上げることが可能なことから注
目を集めている。2. Description of the Related Art In recent years, the activated sludge method, biofilm method, immobilized microorganism method and the like have been remarkably spread.
Of these, sewage treatment apparatuses that utilize a microorganism-immobilized carrier have been drawing attention because they can increase the concentration of microorganisms in the tank.
【０００３】[0003]
【発明が解決しようとする課題】本発明者らは、固定化
担体を利用した生物処理装置の開発を行ってきたが、そ
の過程で次のような技術的課題に遭遇した。水深１０ｍ
程度の深層曝気槽において固定化担体を使用した際に、
固定化担体が底部に沈殿し、処理性能が著しい低下をき
たした。担体の沈殿を防止する手段として、散気装置を
直接底部に設置する方法を検討したが、散気水深が１０
ｍになることから特殊な高圧ブロアーが必要となり、設
備費が膨大になることが予想された。さらに、１０ｍ水
深から曝気を行った場合、過飽和の窒素ガスが汚泥に微
細気泡として付着し、最終沈殿池で汚泥が浮上すること
が懸念された。そこで、本発明は、担体の底部沈殿を未
然に防止し、処理性能の低下を防止することのできる深
層曝気槽を提供することを課題とする。The present inventors have developed a biological treatment apparatus using an immobilized carrier, but encountered the following technical problems in the process. Water depth 10m
When using the immobilization carrier in a deep aeration tank
The immobilized carrier settled at the bottom, and the treatment performance was significantly reduced. As a means of preventing the carrier from settling, a method of installing an air diffuser directly on the bottom was examined, but the aeration water depth was 10
It was expected that a special high-pressure blower would be required because of the m, and the equipment cost would be enormous. Furthermore, when aeration was performed from a water depth of 10 m, it was feared that the supersaturated nitrogen gas adhered to the sludge as fine bubbles and the sludge floated up in the final settling tank. Therefore, it is an object of the present invention to provide a deep aeration tank capable of preventing bottom precipitation of a carrier and preventing deterioration of treatment performance.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明では、流動性の微生物固定化担体を用いた深
層曝気槽において、該曝気槽の中間水深部に吐出口を有
する上吐出し型水中機械攪拌式曝気装置を配置し、該曝
気装置の吸込部と槽底部をドラフトチューブで連結する
こととしたものである。前記深層曝気槽において、曝気
装置は、複数基設置され、曝気槽の長手方向に単列又は
複数列で配備され、また、曝気槽は、槽底部がドラフト
チューブの吸込口に向かって、担体が移動しやすいよう
に傾斜しているのがよい。In order to solve the above-mentioned problems, according to the present invention, in a deep layer aeration tank using a fluidized microorganism-immobilized carrier, an upper discharge having a discharge port at an intermediate water depth of the aeration tank. A squirrel-type underwater mechanical stirring type aerator is arranged, and the suction part of the aerator and the tank bottom are connected by a draft tube. In the deep layer aeration tank, a plurality of aeration devices are installed, are arranged in a single row or a plurality of rows in the longitudinal direction of the aeration tank, the aeration tank, the bottom of the tank toward the suction port of the draft tube, the carrier It is better to be inclined so that it is easy to move.
【０００５】[0005]
【発明の実施の形態】次に、本発明の構成を詳細に説明
する。本発明における曝気装置の設置水深は、ブロアー
の汎用的な吐出圧力、あるいは窒素ガスの過飽和を考慮
すると３〜６ｍが適切であり、一般的には５ｍ前後が採
用される。また本発明におけるドラフトチューブの口径
は４０〜２４０ｍｍが用いられるが、固定化担体が安定
して上昇できる液上昇流速を確保できる口径であればよ
い。本発明で使用する固定化担体としては、粒径１〜１
０ｍｍ程度の粒状の親水性ゲル、プラスチック片、繊維
をマリモ状に絡めた高分子担体、スポンジ、あるいは発
泡性セラミックなどが使用できる。BEST MODE FOR CARRYING OUT THE INVENTION Next, the structure of the present invention will be described in detail. Considering the general discharge pressure of the blower or the supersaturation of nitrogen gas, the installation water depth of the aeration device in the present invention is appropriately 3 to 6 m, and generally about 5 m is adopted. The diameter of the draft tube used in the present invention is 40 to 240 mm, but any diameter may be used as long as it can secure a liquid rising flow rate with which the immobilized carrier can stably rise. The immobilization carrier used in the present invention has a particle size of 1 to 1.
A granular hydrophilic gel of about 0 mm, a plastic piece, a polymer carrier in which fibers are entwined in a marimo shape, a sponge, or a foamable ceramic can be used.
【０００６】本発明の深層曝気槽は、標準活性汚泥法の
エアレーションタンク、硝化脱窒法における硝化槽（好
気タンク）、あるいは嫌気−無酸素−好気法における好
気タンクなどに採用可能である。本発明で使用する水中
機械攪拌式曝気装置は一般に使用されている物でよい
が、使用する担体が柔らかい場合は、担体の破壊が生じ
ないようにプロペラの設置位置、回転数、あるいは流路
面を滑らかに仕上げるなどの破壊防止処置を講じる必要
がある。次に、図面を用いて本発明の構成を具体的に説
明する。図１は本発明の一例を示す深層曝気槽の構成図
であり、図１の（ａ）は平面図、（ｂ）はＡ−Ａ断面
図、（ｃ）はＢ−Ｂ断面図である。The deep aeration tank of the present invention can be adopted as an aeration tank of the standard activated sludge method, a nitrification tank (aerobic tank) in the nitrification and denitrification method, or an aerobic tank in the anaerobic-anoxic-aerobic method. . The underwater mechanical stirring type aerator used in the present invention may be a generally used one, but when the carrier used is soft, the installation position of the propeller, the number of revolutions, or the flow path surface should be set so that the carrier is not destroyed. It is necessary to take measures to prevent destruction such as smooth finishing. Next, the configuration of the present invention will be specifically described with reference to the drawings. 1A and 1B are configuration diagrams of a deep aeration tank showing an example of the present invention. FIG. 1A is a plan view, FIG. 1B is a sectional view taken along line AA, and FIG. 1C is a sectional view taken along line BB.
【０００７】図１は、幅８ｍ×長２４ｍ×水深１０ｍの
深層曝気槽１であり、原水流入部２と処理水流出部８を
有する。ここで処理水流出部８には固定化担体６の流出
を防止する目的で担体分離スクリーン４が設けてある。
水中機械攪拌式曝気装置３は１５ｋＷのものを長手方向
に３台設置し、設置水深は５ｍである。曝気装置は上吐
出型であり、曝気装置下部の吸込部と槽底部９は口径１
７０ｍｍのドラフトチューブ５で連結する。使用する固
定化担体６は粒径４ｍｍ、比重１．０２の親水性ゲルで
あり、その使用量は容積率で１５ｖ／ｖ％である。曝気
装置内部では循環流を励起する攪拌羽根が回転し、羽根
付近に空気１０が８〜１８Ｎｍ3 ／時で通気される。そ
の結果、槽内には図１（ｂ）に示されるようなフローパ
ターンが形成され、固定化担体６は槽底部９に沈殿する
ことなく、槽内を円滑に流動する。この時のドラフトチ
ューブ５内の液上昇流速は３０〜４０ｍ／分である。固
定化担体６の沈降速度は２〜３ｍ／分であることから、
固定化担体６はドラフトチューブ５内を安定に上昇す
る。FIG. 1 shows a deep aeration tank 1 having a width of 8 m, a length of 24 m, and a water depth of 10 m, which has a raw water inflow part 2 and a treated water outflow part 8. Here, the treated water outflow portion 8 is provided with a carrier separation screen 4 for the purpose of preventing the immobilization carrier 6 from flowing out.
As for the submersible mechanical stirring type aerator 3, three 15 kW aerators are installed in the longitudinal direction, and the installation water depth is 5 m. The aeration device is an upper discharge type, and the suction part at the bottom of the aeration device and the tank bottom 9 have a diameter of 1
Connect with a 70 mm draft tube 5. The immobilization carrier 6 used is a hydrophilic gel having a particle size of 4 mm and a specific gravity of 1.02, and the amount thereof used is 15 v / v% in volume ratio. Inside the aerator, a stirring blade that excites a circulating flow rotates, and air 10 is ventilated near the blade at 8 to 18 Nm 3 / hour. As a result, a flow pattern as shown in FIG. 1B is formed in the tank, and the immobilization carrier 6 flows smoothly in the tank without settling on the bottom 9 of the tank. At this time, the liquid rising velocity in the draft tube 5 is 30 to 40 m / min. Since the settling speed of the immobilized carrier 6 is 2 to 3 m / min,
The immobilization carrier 6 stably rises in the draft tube 5.
【０００８】図２は本発明の他の例を示す深層曝気槽の
構成図で、図２の（ａ）は平面図、（ｂ）はＡ−Ａ断面
図、（ｃ）はＢ−Ｂ断面図である。図２は、幅８ｍ×長
２０ｍ×水深１０ｍの深層曝気槽１に、７．５ｋＷの上
吐出型水中機械攪拌式曝気装置３を２台水深５ｍに設置
した例である。この時は担体が曝気槽の角部に沈殿する
ことが懸念されたために、ドラフトチューブの吸込口に
向かって槽底部に３０度の傾斜を設けた。この深層曝気
槽に粒径５ｍｍ、比重１．０３の比重調整プラスチック
片を固定化担体６として２０ｖ／ｖ％で使用し、空気を
４〜６Ｎｍ3 ／分で通気した。その結果、図２（ｂ）に
示すようなフローパターンが形成され、固定化担体は槽
内を円滑に流動した。このように本発明により、深層曝
気槽において固定化担体を安定に流動させることが可能
である。また、水中機械攪拌式曝気装置は旋回流方式よ
りも曝気動力を節減することが可能である。さらに、水
中機械攪拌式曝気装置は槽内の攪拌混合力が強いことか
ら、槽内を完全混合状態に維持できる。これにより、固
定化担体の分布濃度を均一化でき、固定化担体の能力を
最大限に発揮することが可能になる。2A and 2B are configuration diagrams of a deep aeration tank showing another example of the present invention. FIG. 2A is a plan view, FIG. 2B is a sectional view taken along line AA, and FIG. 2C is a sectional view taken along line BB. It is a figure. FIG. 2 is an example in which two 7.5 kW upper discharge type submersible mechanical stirring aerators 3 are installed at a water depth of 5 m in a deep aeration tank 1 having a width of 8 m, a length of 20 m and a water depth of 10 m. At this time, there was a concern that the carrier might settle at the corners of the aeration tank, so a 30 degree inclination was provided at the bottom of the tank toward the suction port of the draft tube. In this deep aeration tank, a specific gravity adjusting plastic piece having a particle size of 5 mm and a specific gravity of 1.03 was used as the immobilization carrier 6 at 20 v / v%, and air was aerated at 4 to 6 Nm 3 / min. As a result, a flow pattern as shown in FIG. 2 (b) was formed, and the immobilized carrier smoothly flowed in the tank. As described above, according to the present invention, it is possible to stably flow the immobilized carrier in the deep aeration tank. In addition, the submersible mechanical stirring type aerator can save aeration power as compared with the swirling flow system. Further, since the submersible mechanical stirring type aerator has a strong stirring and mixing power inside the tank, the inside of the tank can be maintained in a completely mixed state. As a result, the distribution concentration of the immobilization carrier can be made uniform, and the capability of the immobilization carrier can be maximized.
【０００９】[0009]
【実施例】本発明の実施例として、図３に示す循環式硝
化脱窒装置の硝化槽（好気タンク）に深層曝気槽を採用
した例を示す。 実施例１ （ａ）原水２、 都市下水一次処理水：ＢＯＤ１００ｍｇ／ｌ、ＮＨ4 −
Ｎ３０ｍｇ／ｌ、 水量：１５，０００ｍ3 ／日、 （ｂ）深層曝気槽 脱窒槽１１： 幅６．５ｍ×長３１ｍ×水深１０ｍ、 有効容量：２，０００ｍ3 、 水中攪拌機１３：ＤＳＲ−２４０Ｕ（荏原製作所製、３０ｋ Ｗ）×２台、 硝化槽１２： 幅６．５ｍ×長２３ｍ×水深１０ｍ、 有効容量：１，４７０ｍ3 、 水中機械攪拌式曝気装置３：ＤＳＲ−１４０Ｕ（荏原製作所 製、１ｋＷ）×３台、 ドラフトチューブ：口径１４０ｍｍ×４ｍ×３本、 曝気風量１０：１２Ｎｍ3 ／（分・台）×３台、EXAMPLE As an example of the present invention, an example in which a deep aeration tank is adopted as the nitrification tank (aerobic tank) of the circulation type nitrification denitrification apparatus shown in FIG. Example 1 (a) Raw water 2, municipal wastewater primary treated water: BOD 100 mg / l, NH 4 −
N 30 mg / l, water amount: 15,000 m 3 / day, (b) deep aeration tank denitrification tank 11: width 6.5 m x length 31 m x water depth 10 m, effective capacity: 2,000 m 3 , underwater agitator 13: DSR-240U ( Ebara Corporation, 30 kW) x 2, Nitrification tank 12: Width 6.5 m x Length 23 m x Water depth 10 m, Effective capacity: 1,470 m 3 , Underwater mechanical stirring type aerator 3: DSR-140U (Ebara Corporation, 1kW) x 3 units, Draft tube: 140mm x 4m x 3, aeration air volume 10: 12Nm 3 / (min / unit) x 3 units,
【００１０】（ｃ）固定化担体６： 材質：ポリエチレングリコール製の親水性ゲル、 粒径：４ｍｍ、 比重：１．０２、 投入量：かさ体積として２２０ｍ3 （充填率１５ｖ／ｖ
％）、 （ｄ）ＭＬＳＳ：２５００ｍｇ／ｌ、 （ｅ）運転結果 図３に示されるようなフローパターンが曝気槽内に形成
され、担体は底部に沈殿することなく、槽内を均一濃度
（１５％）で流動した。その結果、処理水８の平均水質
はＢＯＤ５．４ｍｇ／ｌ、Ｔ−Ｎ９．５ｍｇ／ｌ、ＮＨ
4 −Ｎ０．４ｍｇ／ｌであり、極めて良好であった。(C) Immobilization carrier 6: Material: hydrophilic gel made of polyethylene glycol, particle size: 4 mm, specific gravity: 1.02, input amount: 220 m 3 as bulk volume (filling rate 15 v / v
%), (D) MLSS: 2500 mg / l, (e) Operation result A flow pattern as shown in FIG. 3 is formed in the aeration tank, and the carrier does not precipitate at the bottom, and the carrier has a uniform concentration (15%). %). As a result, the average water quality of treated water 8 was BOD 5.4 mg / l, T-N 9.5 mg / l, NH.
4- N was 0.4 mg / l, which was extremely good.
【００１１】[0011]
【発明の効果】本発明によれば、微生物固定化担体を利
用する深層曝気槽において、下部にドラフトチューブを
連結した水中機械攪拌式曝気装置を使用することで、固
定化担体の底部沈殿を防止できる。さらに、曝気風量を
低減できることから省エネルギー的な処理も可能とな
り、槽内の担体濃度を均等にできることから担体の能力
を最大限に発揮可能である。本発明は、固定化担体を利
用する深層曝気槽に、広く採用されていくものと確信す
る。EFFECTS OF THE INVENTION According to the present invention, in a deep aeration tank using a microorganism-immobilized carrier, the bottom sedimentation of the immobilized carrier is prevented by using an underwater mechanical stirring type aerator with a draft tube connected to the lower part. it can. Furthermore, since the amount of aeration air can be reduced, energy-saving processing can be performed, and since the carrier concentration in the tank can be made uniform, the capacity of the carrier can be maximized. It is believed that the present invention will be widely adopted in deep aeration tanks that utilize immobilized carriers.
【図１】本発明の深層曝気槽の一例を示す構成図で
（ａ）は平面図、（ｂ）はＡ−Ａ断面図、（ｃ）はＢ−
Ｂ断面図である。FIG. 1 is a configuration diagram showing an example of a deep aeration tank of the present invention, (a) is a plan view, (b) is a sectional view taken along line AA, and (c) is B-.
It is B sectional drawing.
【図２】本発明の深層曝気槽の他の例を示す構成図で、
（ａ）は平面図、（ｂ）はＡ−Ａ断面図、（ｃ）はＢ−
Ｂ断面図である。FIG. 2 is a configuration diagram showing another example of the deep aeration tank of the present invention,
(A) is a plan view, (b) is a sectional view taken along line AA, and (c) is B-.
It is B sectional drawing.
【図３】本発明の深層曝気槽を用いた循環硝化脱窒装置
の構成図。FIG. 3 is a configuration diagram of a circulating nitrification denitrification apparatus using a deep aeration tank of the present invention.
１：深層曝気槽、２：原水流入部、３：水中機械攪拌式
曝気装置、４：担体分離スクリーン、５：ドラフトチュ
ーブ、６：固定化担体、７：傾斜部、８：処理水流出
部、９：槽底部、１０：空気送入管、１１：脱窒槽、１
２：硝化槽、１３：水中攪拌機1: Deep aeration tank, 2: Raw water inflow part, 3: Underwater mechanical stirring type aeration device, 4: Carrier separation screen, 5: Draft tube, 6: Immobilized carrier, 7: Inclined part, 8: Treated water outflow part, 9: bottom of the tank, 10: air inlet pipe, 11: denitrification tank, 1
2: Nitrification tank, 13: Underwater stirrer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 勝倉 昇 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 山田 武彦 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 栃久保 英二 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Katsukura 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Ebara Corporation (72) Inventor Takehiko Yamada 11-11 Haneda-asaka-cho, Ota-ku, Tokyo Inside the EBARA CORPORATION (72) Eiji Tochikubo Eiji Tochikubo 11-1 Haneda-Asahi-cho, Ota-ku, Tokyo Inside the EBARA CORPORATION
Claims (3)
曝気槽において、該曝気槽の中間水深部に吐出口を有す
る上吐出し型水中機械攪拌式曝気装置を配置し、該曝気
装置の吸込部と槽底部をドラフトチューブで連結したこ
とを特徴とする深層曝気槽。1. A deep aeration tank using a flowable microorganism-immobilized carrier, wherein an upper discharge type underwater mechanical stirring type aerator having a discharge port is arranged in the intermediate water depth of the aeration tank, A deep aeration tank characterized by connecting the suction part and the bottom of the tank with a draft tube.
槽の長手方向に単列又は複数列で配備することを特徴と
する請求項１記載の深層曝気槽。2. The deep aeration tank according to claim 1, wherein a plurality of the aeration devices are installed and arranged in a single row or a plurality of rows in the longitudinal direction of the aeration tank.
ブの吸込口に向かって傾斜していることを特徴とする請
求項１又は２記載の深層曝気槽。3. The deep aeration tank according to claim 1 or 2, wherein a bottom of the aeration tank is inclined toward a suction port of the draft tube.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20856295A JP3228455B2 (en) | 1995-07-25 | 1995-07-25 | Deep aeration tank |
| DE1996626864 DE69626864T2 (en) | 1995-05-23 | 1996-05-23 | Waste water basin for the aerobic treatment of waste water, including carrier |
| PCT/JP1996/001365 WO1996037444A1 (en) | 1995-05-23 | 1996-05-23 | Method of aerobically treating wastewater and treatment tank |
| KR1019970708312A KR100409056B1 (en) | 1995-05-23 | 1996-05-23 | Aerobic treatment method and treatment tank of sewage |
| US08/952,609 US6077424A (en) | 1995-05-23 | 1996-05-23 | Method for aerobically treating wastewater and a treatment tank for such method |
| CN96194979A CN1098815C (en) | 1995-05-23 | 1996-05-23 | Method of aerobically treating waste water and treatment tank |
| CA 2221923 CA2221923A1 (en) | 1995-05-23 | 1996-05-23 | Method of aerobically treating liquid-waste and treatment tank |
| EP96914409A EP0933334B1 (en) | 1995-05-23 | 1996-05-23 | Treatment tank for AEROBICALLY TREATING WASTEWATER comprising carriers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20856295A JP3228455B2 (en) | 1995-07-25 | 1995-07-25 | Deep aeration tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0938685A true JPH0938685A (en) | 1997-02-10 |
| JP3228455B2 JP3228455B2 (en) | 2001-11-12 |
Family
ID=16558246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20856295A Expired - Lifetime JP3228455B2 (en) | 1995-05-23 | 1995-07-25 | Deep aeration tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3228455B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008080269A (en) * | 2006-09-28 | 2008-04-10 | Sharp Corp | Nitrogen-containing wastewater treatment apparatus and method |
-
1995
- 1995-07-25 JP JP20856295A patent/JP3228455B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008080269A (en) * | 2006-09-28 | 2008-04-10 | Sharp Corp | Nitrogen-containing wastewater treatment apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3228455B2 (en) | 2001-11-12 |
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