JP4194702B2 - Low speed carrier floating machine - Google Patents
Low speed carrier floating machine Download PDFInfo
- Publication number
- JP4194702B2 JP4194702B2 JP03897499A JP3897499A JP4194702B2 JP 4194702 B2 JP4194702 B2 JP 4194702B2 JP 03897499 A JP03897499 A JP 03897499A JP 3897499 A JP3897499 A JP 3897499A JP 4194702 B2 JP4194702 B2 JP 4194702B2
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- Prior art keywords
- reaction tank
- carrier
- low
- upper blade
- speed
- Prior art date
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- Expired - Lifetime
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- 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
Description
【０００１】
【発明の属する技術分野】
本発明は、担体添加活性汚泥法で、反応槽内の担体の浮遊効果を増大し担体の沈殿を防止するため、反応槽内の下水汚泥に流れを与える低速担体浮遊機に関する。
【０００２】
【従来の技術】
下水処理場には、下水処理において脱窒素・脱燐処理の効率を向上させるために、担体添加活性汚泥法が導入されている。担体添加活性汚泥法では、菌の付着・生殖した担体を反応槽内の下水汚泥の中で浮遊させて、脱窒素・脱燐処理を行う。
【０００３】
この担体添加活性汚泥法で効率よく脱窒素・脱燐処理を行うには、担体と下水汚泥の接触面積、接触頻度を大きくすることが望ましい。そこで、担体と下水汚泥の接触面積、接触頻度を大きくするため、下水汚泥の中に多量の担体を混合している。
ところが、担体は、比重が水より大であるので、単に下水汚泥の中に多量に混合するだけでは沈殿し、圧密状態になって担体に付着した菌を死滅させてしまう。従って、担体を下水汚泥中で浮遊させるために、下水汚泥に流れを与える必要がある。そこで、反応槽には、下水汚泥に流れを与えて担体を下水汚泥中で浮遊させるための低速担体浮遊機が設けられている。
【０００４】
低速担体浮遊機は、羽根の回転により反応槽内の下水汚泥に流れを与えるものであって、同一平面上の複数枚の羽根を一段分として、単段の羽根を備えたものと２段の羽根を備えたものがある。２段の羽根を備えたものは、一般に水深の大きい反応槽で用いられる。
２段の羽根を備えた低速担体浮遊機は、図２に示すように、反応槽１の天井２の中央に設置された駆動部３から反応槽１内へ回転軸４を垂設し、この回転軸４には、反応槽１の底面７付近に下段羽根５、反応槽１の液面８付近に上段羽根６を設けている。
【０００５】
担体はスポンジのように柔らかい物質であり、強い流れを与えると担体に損傷を生ずるおそれがあるので、下段羽根５及び上段羽根６の回転速度は、３〜１０ｒｐｍ程度の低速回転とし、反応槽１内において下水汚泥に１０ｃｍ／ｓｅｃ程度の低速の流れを与える。
従来の低速担体浮遊機では、この下段羽根５と上段羽根６には、同径、同長のものが用いられており、反応槽１の底面７の外周部で上記のような低速の流れを与えるため、下段羽根５及び上段羽６の回転外径は、反応槽１の内径に近い大径となっている。
【０００６】
【発明が解決しようとする課題】
このような低速担体浮遊機で、下向流Ｄを発生させた場合、反応槽１の側壁９に沿って上昇流Ｕが発生する。しかし、この上昇流Ｕは、大径の上段羽根６の影響を受けて上段羽根６付近で下向流Ｄとなり、上段羽根６以上の高さには上昇しない。従って、反応槽１の液面８付近では担体の浮遊移動がなくなってしまうという問題がある。
【０００７】
本発明は、担体添加活性汚泥法におけるかかる問題を解決するものであって、担体を反応槽の液面まで浮遊移動させることができ、脱窒素・脱燐処理を促進し処理効率を向上させる低速担体浮遊機を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は、反応槽と、その反応槽の天井の中央に設置された駆動部と、その駆動部から前記反応槽内へ垂設された回転軸と、その回転軸の上下に離間して配置された２段の羽根とを備え、その２段の羽根が、前記反応槽の底面近傍に設けられた下段羽根と、前記反応槽の液面近傍且つ液面よりも低い位置に設けられた上段羽根とを有してなり、担体添加活性汚泥法で、前記反応槽内に担体を浮遊させるために、前記２段の羽根を毎分３〜１０回転の低速で回転させることにより、前記反応槽内の下水汚泥に上下に旋回する流れを与える低速担体浮遊機であって、前記下段羽根の回転外径は、前記反応槽の内径近傍まで延びる大径であり、前記上段羽根の回転外径は、前記上下に旋回する流れのうち、前記反応槽の側壁に沿って上昇する上昇流が、当該上段羽根の外側を通り前記液面まで到達するように、前記下段羽根の回転外径の１／２〜１／３の小径にすることにより上記課題を解決している。
【０００９】
この低速担体浮遊機は、下段羽根と上段羽根とを回転させ、反応槽内の下水汚泥に流れを与えて担体を下水汚泥中で浮遊させる。下向流を発生させた場合、反応槽の側壁に沿って上昇流が発生する。この上昇流は、上段羽根が小径であるので上段羽根の外側を通り液面まで到達する。従って、担体を反応槽の液面まで浮遊移動させることができ、脱窒素・脱燐処理を促進し処理効率を向上させる。
【００１０】
【発明の実施の形態】
図１は、本発明の実施の一形態である低速担体浮遊機の構成図である。
低速担体浮遊機は、反応槽１の天井２の中央に設置された駆動部３から反応槽１内へ回転軸４を垂設し、この回転軸４には、反応槽１の底面７付近に下段羽根５、反応槽１の液面８付近に上段羽根１０を設けている。
【００１１】
下段羽根５は、従来の低速担体浮遊機で用いられているものと同様に、回転外径が反応槽１の内径に近い大径となっている。
これに対し、上段羽根１０は、回転外径が下段羽根より小径で、下段羽根５の回転外径の１／２〜１／３となっているので、上段羽根１０の先端と反応槽１の側壁９との間隔が広くなっている。
【００１２】
下水処理を行う場合には、反応槽１内の下水汚泥の中に担体を混合し、駆動部３で回転軸４を駆動して下段羽根５及び上段羽根１０を３〜１０ｒｐｍ程度の低速で回転させ、反応槽１内の下水汚泥に１０ｃｍ／ｓｅｃ程度の流れを与えて担体を下水汚泥中で浮遊させる。
低速担体浮遊機で、下向流Ｄを発生させた場合、反応槽１の底面７の外周部から側壁９に沿って上昇流Ｕが発生する。この低速担体浮遊機は、上段羽根１０が小径で上段羽根１０の先端と反応槽１の側壁９との間隔が広くなっているので、この上昇流Ｕは、上段羽根１０の影響を受けなくなり、上段羽根１０の外側を通り液面８まで到達する。
【００１３】
上昇した下水汚泥は、上段羽根１０の回転により生ずる下向流Ｄによって反応槽１の液面８付近で中央部へ流れ、再び下向に転ずる。
従って、均一な濃度で担体を反応槽１の底面７から液面８まで効率良く浮遊移動させることができ、下水汚泥の脱窒素・脱燐処理を促進し処理効率を向上させる。
【００１４】
【発明の効果】
以上説明したように、本発明の低速担体浮遊機は、担体を反応槽の液面まで効率良く浮遊移動させることができ、脱窒素・脱燐処理を促進し処理効率を向上させる。
【図面の簡単な説明】
【図１】本発明の実施の一形態である低速担体浮遊機の構成図である。
【図２】従来の低速担体浮遊機の構成図である。
【符号の説明】
１ 反応槽
２ 天井
３ 駆動部
４ 回転軸
５ 下段羽根
７ 底面
８ 液面
９ 側壁
１０ 上段羽根[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-speed carrier floater for supplying a flow to sewage sludge in a reaction tank in order to increase the floating effect of the carrier in a reaction tank and prevent sedimentation of the carrier in the support-added activated sludge method.
[0002]
[Prior art]
In order to improve the efficiency of denitrification / dephosphorization treatment in sewage treatment plants, a carrier-added activated sludge method has been introduced in sewage treatment plants. In the carrier-added activated sludge method, a carrier on which bacteria have adhered and reproduced is suspended in sewage sludge in a reaction tank, and denitrification and dephosphorization are performed.
[0003]
In order to efficiently perform the denitrification / dephosphorization treatment by the support-added activated sludge method, it is desirable to increase the contact area and contact frequency between the support and sewage sludge. Therefore, in order to increase the contact area and contact frequency between the carrier and sewage sludge, a large amount of carrier is mixed in the sewage sludge.
However, since the specific gravity of the carrier is larger than that of water, the carrier simply settles in a large amount in the sewage sludge and becomes a compacted state, killing the bacteria attached to the carrier. Therefore, it is necessary to give a flow to the sewage sludge in order to float the carrier in the sewage sludge. Therefore, the reaction tank is provided with a low-speed carrier floating machine for applying a flow to the sewage sludge to float the carrier in the sewage sludge.
[0004]
The low-speed carrier floating machine gives a flow to the sewage sludge in the reaction tank by the rotation of the blades, and includes a plurality of blades on the same plane as one stage, and a single stage blade and two stages. Some have feathers. Those equipped with two-stage blades are generally used in a reaction tank having a large water depth.
As shown in FIG. 2, the low-speed carrier floating machine equipped with two-stage blades has a rotating shaft 4 suspended from the drive unit 3 installed in the center of the ceiling 2 of the reaction tank 1 into the reaction tank 1. The rotary shaft 4 is provided with a lower blade 5 near the bottom surface 7 of the reaction tank 1 and an upper blade 6 near the liquid surface 8 of the reaction tank 1.
[0005]
Since the carrier is a soft material such as a sponge and may cause damage to the carrier when a strong flow is applied, the rotation speed of the lower blade 5 and the upper blade 6 is set to a low speed of about 3 to 10 rpm, and the reaction vessel 1 Inside the sewage sludge, a low-speed flow of about 10 cm / sec is given.
In the conventional low-speed carrier floating machine, the lower blade 5 and the upper blade 6 have the same diameter and the same length, and the low-speed flow as described above is generated on the outer periphery of the bottom surface 7 of the reaction tank 1. For this reason, the rotation outer diameters of the lower blade 5 and the upper blade 6 are large diameters close to the inner diameter of the reaction tank 1.
[0006]
[Problems to be solved by the invention]
When the downward flow D is generated with such a low-speed carrier floating machine, the upward flow U is generated along the side wall 9 of the reaction tank 1. However, the upward flow U is influenced by the large-diameter upper blade 6 and becomes a downward flow D in the vicinity of the upper blade 6, and does not rise to a height higher than the upper blade 6. Therefore, there is a problem that the carrier is not suspended in the vicinity of the liquid surface 8 in the reaction tank 1.
[0007]
The present invention solves such a problem in the support addition activated sludge method, which can float the support to the liquid level in the reaction tank, promotes denitrification / dephosphorization treatment, and improves the processing efficiency. It aims at providing a carrier floating machine.
[0008]
[Means for Solving the Problems]
The present invention includes a reaction vessel, a drive unit installed at the center of the ceiling of the reaction vessel, a rotary shaft suspended from the drive unit into the reaction vessel, and spaced apart above and below the rotary shaft. Two-stage blades, the two-stage blades provided in the vicinity of the bottom surface of the reaction tank, and the upper stage provided in the vicinity of the liquid level of the reaction tank and lower than the liquid level. it and a blade, with a carrier added activated sludge process, in order to float the carrier into the reaction vessel, by rotating at low speed per minute 3-10 rotating blades of the two stages, the reactor A low-speed carrier floating machine that gives a flow swirling up and down to the sewage sludge inside, the rotating outer diameter of the lower blade is a large diameter extending to the vicinity of the inner diameter of the reaction tank , and the rotating outer diameter of the upper blade is Of the flow swirling up and down, the upward flow rising along the side wall of the reaction vessel , So as to reach the outside of the upper blade up through the liquid surface, solves the above problems by the small diameter of 1 / 2-1 / 3 of the rotating outside diameter of the lower blade.
[0009]
This low-speed carrier floating machine rotates the lower blade and the upper blade to give a flow to the sewage sludge in the reaction tank to float the carrier in the sewage sludge. When a downward flow is generated, an upward flow is generated along the side wall of the reaction tank. Since the upper blade has a small diameter, the upward flow passes through the outside of the upper blade and reaches the liquid level. Therefore, the carrier can be floated and moved to the liquid level in the reaction tank, and the denitrification / dephosphorization treatment is promoted to improve the treatment efficiency.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram of a low-speed carrier floating machine according to an embodiment of the present invention.
The low-speed carrier floating machine has a rotary shaft 4 suspended from the drive unit 3 installed in the center of the ceiling 2 of the reaction tank 1 into the reaction tank 1, and the rotary shaft 4 is located near the bottom surface 7 of the reaction tank 1. An upper blade 10 is provided near the lower blade 5 and the liquid surface 8 of the reaction tank 1.
[0011]
The lower blade 5 has a rotating outer diameter that is close to the inner diameter of the reaction tank 1 as in the conventional low-speed carrier floating machine.
On the other hand, the upper blade 10 has a rotation outer diameter smaller than that of the lower blade and is 1/2 to 1/3 of the rotation outer diameter of the lower blade 5. The space | interval with the side wall 9 is wide.
[0012]
In the case of performing sewage treatment, a carrier is mixed in sewage sludge in the reaction tank 1, and the rotating shaft 4 is driven by the drive unit 3 to rotate the lower blade 5 and the upper blade 10 at a low speed of about 3 to 10 rpm. The carrier is suspended in the sewage sludge by applying a flow of about 10 cm / sec to the sewage sludge in the reaction tank 1.
When the downward flow D is generated by the low-speed carrier floating machine, the upward flow U is generated along the side wall 9 from the outer peripheral portion of the bottom surface 7 of the reaction tank 1. In this low-speed carrier floating machine, since the upper blade 10 has a small diameter and the distance between the tip of the upper blade 10 and the side wall 9 of the reaction tank 1 is wide, the upward flow U is not affected by the upper blade 10, It reaches the liquid level 8 through the outside of the upper blade 10.
[0013]
The raised sewage sludge flows to the center near the liquid surface 8 of the reaction tank 1 due to the downward flow D generated by the rotation of the upper blades 10 and turns downward again.
Therefore, the carrier can be efficiently floated and moved from the bottom surface 7 to the liquid surface 8 of the reaction tank 1 at a uniform concentration, and the denitrification / dephosphorization treatment of the sewage sludge is promoted to improve the treatment efficiency.
[0014]
【The invention's effect】
As described above, the low-speed carrier floating machine of the present invention can efficiently float and move the carrier to the liquid level of the reaction tank, promotes denitrification / dephosphorization treatment and improves the treatment efficiency.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a low-speed carrier floating machine according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a conventional low-speed carrier floating machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction tank 2 Ceiling 3 Drive part 4 Rotating shaft 5 Lower blade 7 Bottom surface 8 Liquid surface 9 Side wall 10 Upper blade
Claims (1)
前記下段羽根の回転外径は、前記反応槽の内径近傍まで延びる大径であり、前記上段羽根の回転外径は、前記上下に旋回する流れのうち、前記反応槽の側壁に沿って上昇する上昇流が、当該上段羽根の外側を通り前記液面まで到達するように、前記下段羽根の回転外径の１／２〜１／３の小径になっていることを特徴とする低速担体浮遊機。 A reaction tank, a drive unit installed at the center of the ceiling of the reaction tank, a rotary shaft suspended from the drive unit into the reaction tank, and two stages disposed above and below the rotary shaft. The two-stage blades include a lower blade provided near the bottom surface of the reaction tank and an upper blade provided near the liquid surface of the reaction tank and lower than the liquid surface. and will, in the carrier added activated sludge process, in order to float the carrier into the reaction vessel, by rotating at low speed per minute 3-10 rotating blades of the two stages, sewage sludge within the reaction tank A low-speed carrier floater that gives a flow swirling up and down ,
The rotating outer diameter of the lower blade is a large diameter extending to the vicinity of the inner diameter of the reaction tank , and the rotating outer diameter of the upper blade is increased along the side wall of the reaction tank in the flow swirling up and down. A low-speed carrier floater having a small diameter of 1/2 to 1/3 of the rotational outer diameter of the lower blade so that the upward flow reaches the liquid level through the outside of the upper blade. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03897499A JP4194702B2 (en) | 1999-02-17 | 1999-02-17 | Low speed carrier floating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03897499A JP4194702B2 (en) | 1999-02-17 | 1999-02-17 | Low speed carrier floating machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000237780A JP2000237780A (en) | 2000-09-05 |
| JP4194702B2 true JP4194702B2 (en) | 2008-12-10 |
Family
ID=12540139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03897499A Expired - Lifetime JP4194702B2 (en) | 1999-02-17 | 1999-02-17 | Low speed carrier floating machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4194702B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7660455B2 (en) | 1999-08-26 | 2010-02-09 | Nanogeometry Research Inc. | Pattern inspection apparatus, pattern inspection method, and recording medium |
| US7796801B2 (en) | 1999-08-26 | 2010-09-14 | Nanogeometry Research Inc. | Pattern inspection apparatus and method |
| US7817844B2 (en) | 1999-08-26 | 2010-10-19 | Nanogeometry Research Inc. | Pattern inspection apparatus and method |
| US7983471B2 (en) | 2006-12-05 | 2011-07-19 | Ngr Inc. | Pattern inspection apparatus and method |
| US8150140B2 (en) | 2008-12-22 | 2012-04-03 | Ngr Inc. | System and method for a semiconductor lithographic process control using statistical information in defect identification |
| US8422761B2 (en) | 2008-12-22 | 2013-04-16 | Ngr Inc. | Defect and critical dimension analysis systems and methods for a semiconductor lithographic process |
| WO2021083425A3 (en) * | 2020-12-21 | 2021-10-14 | 苏州巴涛信息科技有限公司 | Wastewater treatment apparatus for environmentally friendly machinery |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100451967B1 (en) * | 2001-10-25 | 2004-10-08 | 금호타이어 주식회사 | The Agitating Device to Avoid Sludge and Foam of Mold Release Solution |
| JP4544583B2 (en) * | 2005-02-09 | 2010-09-15 | オルガノ株式会社 | Waste water treatment apparatus and method |
| JP5329021B2 (en) * | 2005-04-06 | 2013-10-30 | 株式会社西原環境 | Sewage treatment equipment |
| JP4938582B2 (en) * | 2007-07-31 | 2012-05-23 | メタウォーター株式会社 | Reaction tank for sewage treatment |
| CN105749618B (en) * | 2016-04-12 | 2017-10-24 | 淮阴工学院 | Submersible type sludge-water separating system |
-
1999
- 1999-02-17 JP JP03897499A patent/JP4194702B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7660455B2 (en) | 1999-08-26 | 2010-02-09 | Nanogeometry Research Inc. | Pattern inspection apparatus, pattern inspection method, and recording medium |
| US7796801B2 (en) | 1999-08-26 | 2010-09-14 | Nanogeometry Research Inc. | Pattern inspection apparatus and method |
| US7817844B2 (en) | 1999-08-26 | 2010-10-19 | Nanogeometry Research Inc. | Pattern inspection apparatus and method |
| US8045785B2 (en) | 1999-08-26 | 2011-10-25 | Ngr Inc. | Pattern inspection apparatus and method |
| US7983471B2 (en) | 2006-12-05 | 2011-07-19 | Ngr Inc. | Pattern inspection apparatus and method |
| US8285031B2 (en) | 2006-12-05 | 2012-10-09 | Ngr Inc. | Pattern inspection apparatus and method |
| US8150140B2 (en) | 2008-12-22 | 2012-04-03 | Ngr Inc. | System and method for a semiconductor lithographic process control using statistical information in defect identification |
| US8422761B2 (en) | 2008-12-22 | 2013-04-16 | Ngr Inc. | Defect and critical dimension analysis systems and methods for a semiconductor lithographic process |
| WO2021083425A3 (en) * | 2020-12-21 | 2021-10-14 | 苏州巴涛信息科技有限公司 | Wastewater treatment apparatus for environmentally friendly machinery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000237780A (en) | 2000-09-05 |
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