JPH04960Y2 - - Google Patents
Info
- Publication number
- JPH04960Y2 JPH04960Y2 JP1983143416U JP14341683U JPH04960Y2 JP H04960 Y2 JPH04960 Y2 JP H04960Y2 JP 1983143416 U JP1983143416 U JP 1983143416U JP 14341683 U JP14341683 U JP 14341683U JP H04960 Y2 JPH04960 Y2 JP H04960Y2
- Authority
- JP
- Japan
- Prior art keywords
- aerator
- speed
- denitrification
- wastewater
- waterway
- 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
Links
- 238000005276 aerator Methods 0.000 claims description 29
- 238000005273 aeration Methods 0.000 claims description 27
- 239000002351 wastewater Substances 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000010802 sludge Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000003795 desorption Methods 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000013019 agitation Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 108091006146 Channels Proteins 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【考案の詳細な説明】
この考案は横軸エアレータを２段切換変速回転
制御して曝気処理と脱窒処理を効率的に行うよう
にした循環水路式活性汚泥処理装置に関する。[Detailed Description of the Invention] This invention relates to a circulating waterway type activated sludge treatment device in which a horizontal axis aerator is controlled in two-stage variable speed rotation to efficiently perform aeration treatment and denitrification treatment.
従来から水路内の汚水に流速を与えながら曝気
処理を行う循環水路式活性汚泥処理装置が提案さ
れているが、この装置では例えば曝気装置の回転
数制御を汚水中のDO等で行つていたので、動力
効率が非常に悪い等の問題点があつた。 Circulating channel activated sludge treatment equipment has been proposed in the past, which performs aeration treatment while giving a flow rate to wastewater in a waterway, but in this equipment, for example, the rotation speed of the aeration equipment was controlled using DO in the wastewater, etc. Therefore, there were problems such as very poor power efficiency.
この考案は上記問題点を解消するためになされ
たもので、単一の曝気槽によつて形成された汚水
処理の循環水路に横軸エアレータを装備しただけ
の頗る簡単な構成でありながら、この横軸エアレ
ータを２段切換変速運転制御するだけで、上記循
環水路における汚水の循環流生起と、該循環流生
起状態での効果的な曝気処理と、上記循環流生起
による効果的な攪拌混合および該循環流生起状態
での効果的な脱窒処理とが確実かつ円滑に行える
循環水路式活性汚泥処理装置を提供することを目
的とする。 This idea was devised to solve the above problems, and although it has a very simple configuration of just equipping a horizontal shaft aerator to the sewage treatment circulation waterway formed by a single aeration tank, it By simply controlling the horizontal shaft aerator with two-stage switching speeds, it is possible to generate a circulating flow of wastewater in the circulation waterway, to perform effective aeration treatment in the state where the circulating flow occurs, and to achieve effective agitation and mixing due to the occurrence of the circulating flow. It is an object of the present invention to provide a circulating waterway type activated sludge treatment device that can perform effective denitrification treatment reliably and smoothly in the circulating flow generation state.
以下、この考案の一実施例を図面参照により説
明する。 An embodiment of this invention will be described below with reference to the drawings.
第１図において、１は単一の循環水路式曝気槽
であり、この曝気槽１は活性汚泥を用いて汚水を
処理すべき循環水路３を形成する隔壁２を有して
いる。 In FIG. 1, reference numeral 1 denotes a single circulating waterway type aeration tank, and this aeration tank 1 has a partition wall 2 forming a circulating waterway 3 in which wastewater is to be treated using activated sludge.
かかる曝気槽１において、循環水路３には図中
矢印方向に循環流を与えるための横軸エアレータ
４が配置されている。 In the aeration tank 1, a horizontal aerator 4 is disposed in the circulation waterway 3 to provide a circulating flow in the direction of the arrow in the figure.
この横軸エアレータ４は、第１図示のように、
上記循環水路３を横切る回転軸５と、この回転軸
５より放射状に伸びた複数のロータ羽根６とを有
する構成となつていて、上記循環水路３の汚水に
循環流を生起させるべく該汚水中の所定深さ（例
えば、100cm〜20cm程度）に浸漬配置されている。 This horizontal axis aerator 4, as shown in the first diagram,
It is configured to have a rotating shaft 5 that crosses the circulation waterway 3 and a plurality of rotor blades 6 that extend radially from the rotational shaft 5, and in order to generate a circulating flow in the wastewater in the circulation waterway 3. It is placed immersed at a predetermined depth (for example, about 100 cm to 20 cm).
そして、上記横軸エアレータ４は、曝気使用点
と脱窒使用点とに随時切換可能な２段変速切換運
転制御手段７によつて２段切換変速回転制御され
るようになつている。 The horizontal axis aerator 4 is rotationally controlled in two stages by a two-stage speed switching operation control means 7 which can switch between an aeration use point and a denitrification use point at any time.
即ち、上記２段変速切換運転制御手段７は、上
記横軸エアレータ４を、循環水路３の汚水中へ
の浸漬状態で酸素供給の動力効率が略最大となる
概要回転数50〜80r.p.m程度（高速運転N1）で、
且つ上記ロータ羽根６の先端速度2.5m／sec以上
程度となる曝気使用点と、上記循環水路３の汚
水に循環流を生起させるが、酸素の供給が殆どな
く、脱窒を起こす嫌気性状態に保持する概要回転
数30r.p.m程度（水流の混合・攪拌を行う低速運
転N2）で、且つ上記ロータ羽根６の先端速度が
1.5m／sec以下程度となる脱窒使用点との２点に
切換変速回転制御するようになつている。 That is, the two-stage shift switching operation control means 7 controls the horizontal shaft aerator 4 at a rough rotational speed of about 50 to 80 r.pm at which the power efficiency of oxygen supply is approximately maximum when the horizontal shaft aerator 4 is immersed in the dirty water of the circulation waterway 3. (high speed operation N 1 ),
In addition, at the aeration use point where the tip speed of the rotor blade 6 is approximately 2.5 m/sec or more, a circulating flow is generated in the wastewater in the circulation waterway 3, but there is almost no oxygen supply and an anaerobic state occurs where denitrification occurs. The general rotational speed to be maintained is approximately 30 r.pm (low-speed operation N 2 for mixing and stirring water flow), and the tip speed of the rotor blade 6 is
The speed rotation is controlled at two points: the denitrification use point and the denitrification use point, which is about 1.5 m/sec or less.
ここで、上記横軸エアレータ４の高速運転時の
回転数N1 1は、高効率の酸素供給を行つて曝気を
効果的に行う回転数であり、第２図示のように、
ロータ羽根６の浸漬水深（ａ〜ｄ）によつて異な
るが、動力効率の略最大点となる（例えば、50〜
80r.p.m）。 Here, the rotational speed N 1 1 of the horizontal axis aerator 4 during high-speed operation is the rotational speed at which aeration is effectively performed by supplying oxygen with high efficiency, and as shown in the second diagram,
Although it varies depending on the immersion depth (a to d) of the rotor blades 6, it is approximately the maximum point of power efficiency (for example, 50 to
80r.pm).
また、低速運転時の回転数N2 2は、汚水に酸素
の供給を殆ど行わずに循環水路３内の汚水に循環
流を生起させ、活性汚泥の沈澱を防ぎ、しかも流
入汚水と曝気混合液とを混合攪拌し、脱窒を促進
する回転数（例えば、30r.p.m程度以下）に設定
されている。 In addition, the rotational speed N 2 2 during low-speed operation generates a circulating flow in the wastewater in the circulation waterway 3 without almost supplying oxygen to the wastewater, prevents sedimentation of activated sludge, and also reduces the amount of inflowing wastewater and aerated mixture. The rotation speed is set at a speed (for example, about 30 rpm or less) that mixes and stirs and promotes denitrification.
以上において、上記循環水路３の後段には沈澱
池８が設けられている。 In the above, a sedimentation tank 8 is provided at the latter stage of the circulation waterway 3.
この沈澱池８には、沈澱処理された上澄液Ａを
放流する放流手段９と、上澄液Ａの一部を上記曝
気槽１に返送する返送手段１０とが設けられてい
る。 This sedimentation tank 8 is provided with a discharge means 9 for discharging the precipitated supernatant liquid A, and a return means 10 for returning a part of the supernatant liquid A to the aeration tank 1.
以上の構成によれば、循環水路３内の汚水は、
高速回転（N1）する横軸エアレータ４により循
環水流が与えられて曝気処理される。この曝気時
にはロータ羽根６の先端速度2.5m／sec以上程度
となつているので、汚水表面に飛沫を多量に作つ
て泡を発生させる。 According to the above configuration, the wastewater in the circulation waterway 3 is
A circulating water flow is provided by a horizontal shaft aerator 4 that rotates at high speed (N 1 ) for aeration treatment. During this aeration, the tip speed of the rotor blade 6 is approximately 2.5 m/sec or more, so a large amount of droplets are created on the surface of the wastewater, generating bubbles.
また、従来はDO等により回転数を制御してい
たので、動力効率の悪い回転数での運転時間が長
く最終的な動力効率が悪かつたが、この考案によ
れば、曝気時の回転数N1 1は動力効率の最良点に
設定されているので、最終的な動力効率が飛躍的
に向上する。 In addition, in the past, the rotation speed was controlled using DO, etc., which resulted in a long operation time at a rotation speed with poor power efficiency, resulting in poor final power efficiency, but with this invention, the rotation speed during aeration Since N 1 1 is set at the best point of power efficiency, the final power efficiency is dramatically improved.
そして、２段変速切換運転制御手段７での適時
の切換により横軸エアレータ４は低速回転（N2）
に減速されると、ロータ羽根６の先端速度は
1.5m／sec以下程度となるので、汚水表面に飛沫
を作らない攪拌となり、しかも、循環水路３内に
循環流を生起させるが、酸素供給が殆どない脱窒
を良好に起こす状態に保持され、極めて効果的な
混合・攪拌脱窒を行うことができる。また、この
際、循環水路３における上述の循環流が、脱窒時
の攪拌に効果的に利用できる。 Then, the horizontal shaft aerator 4 rotates at a low speed (N 2 ) by timely switching by the two-speed changeover operation control means 7.
When the rotor blade 6 is decelerated to
Since it is about 1.5 m/sec or less, the agitation does not create splashes on the surface of the wastewater, and a circulating flow is generated in the circulation waterway 3, but it is maintained in a state where denitrification occurs well with almost no oxygen supply, Extremely effective mixing and stirring denitrification can be performed. Moreover, at this time, the above-mentioned circulation flow in the circulation waterway 3 can be effectively used for stirring during denitrification.
上述のような横軸エアレータ４の回転数の切換
は随時行われるが、汚水中に例えば流量計やDO
メータを設け、水路内の状態に対応させてもよ
い。例えば、横軸エアレータ４の回転数N1′1，
N2 2を第３図示のように組み合わせて１サイクル
ｆを30分〜６時間程度にし、しかも、このサイク
ルを可変とすることによつて、より効果的な処理
を行うことができる。 The rotational speed of the horizontal aerator 4 as described above is switched at any time, but if there is a flow meter or DO
A meter may be provided to respond to conditions within the waterway. For example, the rotation speed N 1 ′ 1 of the horizontal axis aerator 4,
More effective treatment can be achieved by combining N 2 2 as shown in the third diagram to make one cycle f about 30 minutes to 6 hours, and by making this cycle variable.
以上のように、この考案によれば、単一の曝気
槽によつて形成された汚水処理の循環水路に横軸
エアレータを装備しただけの頗る簡単な構成であ
りながら、この横軸エアレータを２段切換変速回
転制御するようにし、その２段切換変速回転制御
条件として、上記横軸エアレータを上記循環水路
の汚水中に浸漬した状態での酸素供給の動力効率
が略最大となる概要回転数50〜80r.p.m程度で、
且つ、上記横軸エアレータのロータ羽根の先端速
度2.5m／sec以上程度となる曝気使用点と、上記
循環水路の汚水に循環流を生起させるが、酸素の
供給が殆どなく、脱窒を起こす嫌気性状態に保持
する概要回転数30r.p.m程度で、且つ、上記ロー
タ羽根の先端速度が1.5m／sec以下程度となる脱
窒使用点との２点を設定し、かかる設定条件の曝
気使用点と脱窒使用点の２点に上記横軸エアレー
タを切換変速運転制御する構成としたので、横軸
エアレータが上述のように設定された曝気使用点
と脱窒使用点の２点に切換変速運転制御され、そ
の何れの点においても循環水路の汚水に循環流が
生起し、該循環流生起状態での上記曝気使用点で
は、上記横軸エアレータが概要回転数50〜80r.p.
m程度に高速回転することにより酸素供給の動力
効率が略最大となり、且つ、ロータ羽根の先端速
度が2.5m／sec以上となることにより、循環流汚
水の表面には多量の飛沫が発生し、もつて、上記
曝気使用点では、酸素移動効率の最大点で効率的
な曝気処理を行うことができる。 As described above, this invention has a very simple configuration in which a horizontal aerator is installed in a sewage treatment circulation waterway formed by a single aeration tank, but this horizontal aerator can be used in two ways. The two-stage variable speed rotation control is performed at a speed of 50, at which the power efficiency of oxygen supply is approximately maximum when the horizontal axis aerator is immersed in the waste water of the circulation waterway. ~ About 80r.pm,
In addition, there is an aeration use point where the tip speed of the rotor blade of the horizontal aerator is approximately 2.5 m/sec or more, and a circulating flow is generated in the wastewater in the circulation waterway, but there is almost no oxygen supply and there is an anaerobic point where denitrification occurs. The denitrification use point is set at a general rotational speed of about 30 r.pm at which the temperature is maintained and the tip speed of the rotor blade is about 1.5 m/sec or less, and the aeration use point under these setting conditions is set. Since the above-mentioned horizontal axis aerator is switched between two points, the aeration use point and the denitrification use point, and is controlled at variable speed, the horizontal axis aerator is switched between two points, the aeration use point and the denitrification use point, which are set as described above, and the variable speed operation is controlled. At any of these points, a circulating flow occurs in the wastewater in the circulating waterway, and at the aeration point where the circulating flow occurs, the horizontal axis aerator has an approximate rotational speed of 50 to 80 r.p.
By rotating at a high speed of approximately 100 m/sec, the power efficiency of oxygen supply is approximately maximized, and the tip speed of the rotor blades is 2.5 m/sec or more, so a large amount of droplets are generated on the surface of the circulating wastewater. Therefore, at the aeration use point, efficient aeration treatment can be performed at the maximum oxygen transfer efficiency.
また、上記脱窒使用点では、上記横軸エアレー
タが概要回転数30r.p.m程度で、且つ、上記ロー
タ羽根の先端速度が1.5m／sec以下に減速運転さ
れることにより、循環水路の汚水に循環流を生起
させた状態で、該循環流汚水の表面に飛沫を発生
させずに、該循環流汚水を攪拌するので、酸素の
供給が殆どなく、極めて効果的な混合・攪拌が行
われて効率的な脱窒処理が行える。 In addition, at the above denitrification use point, the horizontal shaft aerator is operated at an approximate rotational speed of about 30 r.pm, and the tip speed of the rotor blade is decelerated to 1.5 m/sec or less, so that the sewage in the circulation waterway is Since the circulating flow sewage is stirred without generating droplets on the surface of the circulating flow wastewater while the circulating flow is being generated, very effective mixing and agitation can be performed with almost no oxygen supply. Efficient denitrification treatment can be performed.
以上のように、この考案では、横軸エアレータ
を２段変速切換運転制御するだけで、上記循環水
路における汚水の循環流生起と、該循環流生起状
態での効果的な曝気処理と、上記循環流生起によ
る効果的な攪拌混合および該循環流生起状態での
効果的な脱窒処理が確実かつ円滑に行えるという
優れた効果がある。 As described above, in this invention, simply by controlling the horizontal axis aerator by two-speed changeover operation, generation of a circulating flow of sewage in the circulation waterway, effective aeration treatment in the state where the circulating flow is occurring, and the above-mentioned circulation There are excellent effects in that effective stirring and mixing due to flow generation and effective denitrification treatment under the circulating flow generation state can be carried out reliably and smoothly.
第１図はこの考案の一実施例による循環水路式
活性汚泥処理装置の平面図、第２図は横軸エアレ
ータの回転数と動力効率との関係を示す図、第３
図は横軸エアレータの回転数のサイクルの一例を
示す図である。
１……循環水路式曝気槽、３……循環水路、４
……横軸エアレータ、６……ロータ羽根、７……
２段変速切換運転制御。
Fig. 1 is a plan view of a circulating waterway type activated sludge treatment equipment according to an embodiment of this invention, Fig. 2 is a diagram showing the relationship between the rotation speed and power efficiency of the horizontal axis aerator, and Fig. 3
The figure is a diagram showing an example of a cycle of the rotation speed of the horizontal axis aerator. 1...Circulation waterway type aeration tank, 3...Circulation waterway, 4
... Horizontal shaft aerator, 6 ... Rotor blade, 7 ...
2-speed switching operation control.
Claims (1)
形成する単一の循環水路式曝気槽と、上記循環水
路を横切る回転軸より放射状に伸びた複数のロー
タ羽根を有し、上記循環水路の汚水に循環流を生
起させるべく該汚水中の所定深さに浸漬配置され
た横軸エアレータと、この横軸エアレータを、上
記汚水中への浸漬状態で酸素供給の動力効率が略
最大となる概要回転数50〜80r.p.m程度で且つ上
記ロータ羽根の先端速度が2.5m／sec以上程度と
なる曝気使用点と、上記循環水路の汚水に循環流
を生起させるが、酸素の供給が殆どなく、脱窒を
起こす嫌気性状態に保持する概要回転数30r.p.m
程度で且つ上記ロータ羽根の先端速度が1.5m／
sec以下程度となる脱窒使用点との２点に切換変
速回転制御するエアレータ２段変速切換運転制御
手段とから成り、上記循環水路に汚水の循環流を
生起させた状態で該汚水の曝気処理と脱窒処理と
を行うようにした構成を特徴とする循環水路式活
性汚泥処理装置。 It has a single circulation waterway type aeration tank that forms a circulation waterway in which wastewater is treated using activated sludge, and a plurality of rotor blades extending radially from a rotating shaft that crosses the circulation waterway. A horizontal aerator is immersed at a predetermined depth in the wastewater to generate a circulation flow, and the horizontal aerator is rotated so that the power efficiency of oxygen supply is approximately maximum when the aerator is immersed in the wastewater. At the aeration use point where the speed of the rotor blade is approximately 50 to 80 r.pm and the tip speed of the rotor blade is approximately 2.5 m/sec or more, a circulating flow is generated in the wastewater in the circulating waterway, but there is almost no oxygen supply and desorption occurs. General rotation speed 30r.pm to maintain anaerobic conditions that cause nitrogen formation
and the tip speed of the rotor blade is 1.5m/
It consists of an aerator two-stage variable speed switching operation control means that performs variable speed rotation control at two points: a denitrification use point where the denitrification is about sec or less; A circulating waterway type activated sludge treatment device characterized by a configuration that performs denitrification and denitrification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983143416U JPS6049999U (en) | 1983-09-14 | 1983-09-14 | Circulating waterway type activated sludge treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983143416U JPS6049999U (en) | 1983-09-14 | 1983-09-14 | Circulating waterway type activated sludge treatment equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6049999U JPS6049999U (en) | 1985-04-08 |
| JPH04960Y2 true JPH04960Y2 (en) | 1992-01-13 |
Family
ID=30320129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983143416U Granted JPS6049999U (en) | 1983-09-14 | 1983-09-14 | Circulating waterway type activated sludge treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6049999U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS553845A (en) * | 1978-06-23 | 1980-01-11 | Kawasaki Heavy Ind Ltd | Biological treating method and apparatus for waste water |
| JPS5732790A (en) * | 1980-08-07 | 1982-02-22 | Sumitomo Jukikai Envirotec Kk | Treatment of waste water |
-
1983
- 1983-09-14 JP JP1983143416U patent/JPS6049999U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS553845A (en) * | 1978-06-23 | 1980-01-11 | Kawasaki Heavy Ind Ltd | Biological treating method and apparatus for waste water |
| JPS5732790A (en) * | 1980-08-07 | 1982-02-22 | Sumitomo Jukikai Envirotec Kk | Treatment of waste water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6049999U (en) | 1985-04-08 |
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