JP4230023B2 - Low speed carrier floating machine - Google Patents

Low speed carrier floating machine Download PDF

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Publication number
JP4230023B2
JP4230023B2 JP31099798A JP31099798A JP4230023B2 JP 4230023 B2 JP4230023 B2 JP 4230023B2 JP 31099798 A JP31099798 A JP 31099798A JP 31099798 A JP31099798 A JP 31099798A JP 4230023 B2 JP4230023 B2 JP 4230023B2
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Japan
Prior art keywords
carrier
reaction tank
rotating shaft
sewage sludge
floating machine
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Expired - Fee Related
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JP31099798A
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JP2000135497A (en
Inventor
一吉 小池
秀章 坂本
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Furukawa Co Ltd
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Furukawa Co Ltd
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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

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Activated Sludge Processes (AREA)

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。
【０００４】
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。
【０００５】
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。低速担体浮遊機は、図６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に攪拌羽根５を設けたものであって、攪拌羽根５の回転で反応槽１内の下水汚泥Ｗに流れを与える。
【０００６】
担体Ｃ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Ｃに損傷を生ずるおそれがあるので、攪拌羽根５の回転速度は、３〜１０ｒｐｍ程度とし、反応槽１内において下水汚泥Ｗに１０ｃｍ／ｓｅｃ程度の低速の流れを与えている。
【０００７】
【発明が解決しようとする課題】
しかし、低速担体浮遊機では、攪拌羽根５の回転速度がこのように低速であるので、回転軸４の下端部と反応槽１の槽底中央部６との間では下水汚泥Ｗに極めて僅かな流れしか生じないか、あるいは流れが全くない状態となり、反応槽１の槽底中央部６に担体Ｃが沈殿して、担体Ｃに付着した菌を死滅させてしまうおそれがある。
【０００８】
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、低速担体浮遊機の回転軸の下端部と反応槽の槽底中央部との間で、下水汚泥に乱流を発生させ、沈殿しようとする担体に流速を与えて浮遊効果を高め、沈殿を防止することのできる低速担体浮遊機を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明は、担体添加活性汚泥法で、反応槽内に担体を浮遊させるため、反応槽内へ回転軸を垂設して回転軸に攪拌羽根を設け、攪拌羽根の回転で反応槽内の下水汚泥に流れを与える低速担体浮遊機において、回転軸の下端部と反応槽の槽底中央部との間で下水汚泥に乱流を発生させる攪拌補助羽根を、回転軸の下端部に取付けることにより上記課題を解決している。
【００１０】
この低速担体浮遊機は、回転軸を駆動して攪拌羽根を回転させ、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。このとき攪拌羽根の回転に伴って攪拌補助羽根が回転し、回転軸の下端部と反応槽の槽底中央部との間で、下水汚泥に乱流を発生させるので、沈殿しようとする担体に流速を与えて浮遊させ沈殿を防止することができる。
【００１１】
【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、図２は攪拌補助羽根の正面図、図３は攪拌補助羽根の底面図、図４は攪拌補助羽根の側面図である。
【００１２】
低速担体浮遊機は、図１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に攪拌羽根５を設けたものであり、回転軸４の下端部には攪拌補助羽根７が取付けられている。
攪拌補助羽根７は、図３に示すように、その正面８が回転軸４の中心線Ｏから距離Ｌ1 だけオフセットし、取付側端９がオフセット方向に対して直角な方向に中心線Ｏから距離Ｌ2 だけ偏倚した位置で下方へ向けて突設されている。
【００１３】
下水処理を行う場合には、反応槽１内の下水汚泥Ｗの中に担体Ｃを混合し、駆動部３で回転軸４を駆動して攪拌羽根５を３〜１０ｒｐｍ程度の低速で回転させ、反応槽１内の下水汚泥Ｗに流れを与えて担体Ｃを下水汚泥Ｗ中で浮遊させる。このとき攪拌羽根５の回転に伴って攪拌補助羽根７が回転する。攪拌補助羽根７は、もし、取付側端９が回転軸４の中心線Ｏ上となるように取付けられていると、回転軸４の下端部と反応槽１の槽底中央部６との間で回転軸４の中心線Ｏを中心とする回転流が発生して、槽底中央部６に担体Ｃが集積してしまう。しかし、本発明の低速担体浮遊機では、攪拌補助羽根７が回転軸４の中心線Ｏからオフセットした位置に取付けられているので、攪拌補助羽根７の回転によって、下水汚泥Ｗには回転軸４の中心線Ｏを中心とする回転方向のみでなく、半径方向への力も作用する。さらに、取付側端９がオフセット方向に対して直角方向に中心線Ｏから偏倚していると、半径方向の内外双方への力が作用する。従って、回転軸４の下端部と反応槽１の槽底中央部６との間で、下水汚泥Ｗに乱流を発生させるので、槽底中央部６に集積しようとする担体Ｃに不規則な流速を与えて浮遊させ沈殿を防止することができる。
【００１４】
図５は本発明の他の実施の形態である低速担体浮遊機の攪拌補助羽根の側面図である。
ここでは、攪拌補助羽根７は、回転軸４の中心線Ｏからオフセットし、且つ取付側端９がオフセット方向に対して直角方向に中心線Ｏから偏倚した位置において、正面８が水平面に対して角度θだけ傾斜するように取付けられている。
【００１５】
この攪拌補助羽根７は、回転によって、下水汚泥Ｗに回転軸４の中心線Ｏを中心とする回転方向及び半径方向に加えて上下方向への力も作用させる。従って、回転軸４の下端部と反応槽１の槽底中央部６との間で、下水汚泥Ｗに大きな乱流を発生させるので、槽底中央部６に集積しようとする担体Ｃに更に不規則な流速を与えて浮遊させ沈殿を防止することができる。
【００１６】
【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、回転軸の下端部と反応槽の槽底中央部との間で、下水汚泥に乱流を発生させ、沈殿しようとする担体に流速を与えて浮遊効果を高め、沈殿を防止する。従って、下水処理において脱窒素・脱燐処理の効率を向上させることができる。
【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】攪拌補助羽根の正面図である。
【図３】攪拌補助羽根の底面図である。
【図４】攪拌補助羽根の側面図である。
【図５】本発明の他の実施の形態である低速担体浮遊機の攪拌補助羽根の側面図である。
【図６】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 攪拌羽根
６ 槽底中央部
７ 攪拌補助羽根
８ 正面
９ 取付側端
Ｃ 担体
Ｏ 中心線
Ｗ 下水汚泥[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.
[0004]
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.
[0005]
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. As shown in FIG. 6, the low-speed carrier floating machine has a rotating shaft 4 suspended from a driving unit 3 installed in the center of the ceiling 2 of the reaction tank 1 into the reaction tank 1, and a stirring blade 5 The flow is given to the sewage sludge W in the reaction tank 1 by the rotation of the stirring blade 5.
[0006]
Since the carrier C is a soft material such as a sponge and may cause damage to the carrier C when a strong flow is applied, the rotation speed of the stirring blade 5 is set to about 3 to 10 rpm, and the sewage sludge W in the reaction tank 1 is used. Is given a low-speed flow of about 10 cm / sec.
[0007]
[Problems to be solved by the invention]
However, in the low-speed carrier floating machine, since the rotational speed of the stirring blade 5 is such a low speed, the sewage sludge W is extremely small between the lower end portion of the rotating shaft 4 and the tank bottom central portion 6 of the reaction tank 1. There is a possibility that only the flow will be generated or there will be no flow at all, and the carrier C will settle at the center 6 at the bottom of the reaction tank 1 and kill the bacteria attached to the carrier C.
[0008]
The present invention solves this problem in the carrier-added activated sludge method, and generates turbulent flow in the sewage sludge between the lower end of the rotating shaft of the low-speed carrier floating machine and the center of the bottom of the reaction tank. An object of the present invention is to provide a low-speed carrier floating machine capable of increasing the floating effect by giving a flow velocity to the carrier to be precipitated and preventing the precipitation.
[0009]
[Means for Solving the Problems]
The present invention is a support-added activated sludge method, in which a carrier is suspended in a reaction tank, so that a rotating shaft is suspended in the reaction tank, and a stirring blade is provided on the rotating shaft. In a low-speed carrier floating machine that gives flow to sludge, a stirring auxiliary blade that generates turbulent flow in sewage sludge between the lower end of the rotating shaft and the bottom center of the reaction tank is attached to the lower end of the rotating shaft. The above problems are solved.
[0010]
This low-speed carrier floater drives the rotating shaft to rotate the stirring blade, and gives a flow to the sewage sludge in the reaction tank to float the carrier in the sewage sludge. At this time, the auxiliary stirring blade rotates with the rotation of the stirring blade, and turbulent flow is generated in the sewage sludge between the lower end of the rotating shaft and the bottom of the reaction tank. A flow rate can be applied to float and prevent precipitation.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
1 is a configuration diagram of a low-speed carrier floating machine according to an embodiment of the present invention, FIG. 2 is a front view of a stirring auxiliary blade, FIG. 3 is a bottom view of the stirring auxiliary blade, and FIG. 4 is a side view of the stirring auxiliary blade. It is.
[0012]
As shown in FIG. 1, the low-speed carrier floating machine has a rotating shaft 4 suspended from the driving unit 3 installed in the center of the ceiling 2 of the reaction tank 1 into the reaction tank 1, and a stirring blade 5 A stirring auxiliary blade 7 is attached to the lower end portion of the rotary shaft 4.
As shown in FIG. 3, the auxiliary stirring blade 7 has its front surface 8 offset from the center line O of the rotating shaft 4 by a distance L 1 and the attachment side end 9 from the center line O in a direction perpendicular to the offset direction. in the distance L 2 was biased position downward are projected.
[0013]
When sewage treatment is performed, the carrier C is mixed in the sewage sludge W in the reaction tank 1, and the rotating shaft 4 is driven by the drive unit 3 to rotate the stirring blade 5 at a low speed of about 3 to 10 rpm. Then, a flow is applied to the sewage sludge W in the reaction tank 1 to float the carrier C in the sewage sludge W. At this time, the auxiliary stirring blade 7 rotates as the stirring blade 5 rotates. If the auxiliary stirring blade 7 is attached so that the attachment side end 9 is on the center line O of the rotating shaft 4, the stirring auxiliary blade 7 is located between the lower end of the rotating shaft 4 and the tank bottom central portion 6 of the reaction tank 1. As a result, a rotating flow around the center line O of the rotating shaft 4 is generated, and the carrier C accumulates in the tank bottom central portion 6. However, in the low-speed carrier floating machine of the present invention, the auxiliary stirring blade 7 is attached at a position offset from the center line O of the rotating shaft 4, so that the rotating shaft 4 is attached to the sewage sludge W by the rotation of the auxiliary stirring blade 7. In addition to the rotation direction around the center line O, a force in the radial direction also acts. Further, when the attachment side end 9 is deviated from the center line O in a direction perpendicular to the offset direction, a force in both the inside and outside in the radial direction acts. Accordingly, since turbulent flow is generated in the sewage sludge W between the lower end portion of the rotating shaft 4 and the tank bottom central portion 6 of the reaction tank 1, the carrier C which is to be accumulated in the tank bottom central portion 6 is irregular. A flow rate can be applied to float and prevent precipitation.
[0014]
FIG. 5 is a side view of an auxiliary stirring blade of a low-speed carrier floating machine according to another embodiment of the present invention.
Here, the agitation auxiliary blade 7 is offset from the center line O of the rotating shaft 4 and the front face 8 is relative to the horizontal plane at a position where the attachment side end 9 is offset from the center line O in a direction perpendicular to the offset direction. It is attached so as to be inclined by an angle θ.
[0015]
The stirring auxiliary blades 7 cause the sewage sludge W to act on the sewage sludge W in the vertical direction in addition to the rotational direction and the radial direction around the center line O of the rotation shaft 4. Accordingly, since a large turbulent flow is generated in the sewage sludge W between the lower end of the rotating shaft 4 and the tank bottom central part 6 of the reaction tank 1, the carrier C to be accumulated in the tank bottom central part 6 is further undesired. A regular flow rate can be applied to float and prevent precipitation.
[0016]
【The invention's effect】
As described above, the low-speed carrier floating machine of the present invention generates turbulent flow in the sewage sludge between the lower end of the rotating shaft and the center of the bottom of the reaction tank, and increases the flow rate of the carrier to be precipitated. Gives a floating effect and prevents precipitation. Therefore, the efficiency of denitrification / dephosphorization treatment can be improved in sewage treatment.
[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 front view of an auxiliary stirring blade.
FIG. 3 is a bottom view of a stirring auxiliary blade.
FIG. 4 is a side view of an auxiliary stirring blade.
FIG. 5 is a side view of an auxiliary stirring blade of a low-speed carrier floating machine according to another embodiment of the present invention.
FIG. 6 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 Stirring blade 6 Tank bottom center part 7 Stirring auxiliary blade 8 Front surface 9 Attachment side edge C Carrier O Center line W Sewage sludge

Claims (1)

担体添加活性汚泥法で、反応槽内に担体を浮遊させるため、反応槽内へ回転軸を垂設して回転軸に攪拌羽根を設け、攪拌羽根を３〜１０ｒｐｍの低速で回転させ、攪拌羽根の回転で反応槽内の下水汚泥に流れを与える低速担体浮遊機であって、
回転軸の下端部と反応槽の槽底中央部との間で下水汚泥に乱流を発生させる一枚の攪拌補助羽根を回転軸の下端部に有し、該一枚の攪拌補助羽根は、その正面が回転軸の中心線からオフセットするとともに、取付側端が前記オフセット方向に対して直角な方向に中心線から偏倚した位置で下方へ向けて突設されていることを特徴とする低速担体浮遊機。In order to suspend the carrier in the reaction tank by the carrier-added activated sludge method, a rotating shaft is suspended in the reaction tank, a stirring blade is provided on the rotating shaft, and the stirring blade is rotated at a low speed of 3 to 10 rpm. Is a low-speed carrier floating machine that gives a flow to the sewage sludge in the reaction tank,
It has a single agitating support blade for generating turbulence in the sewage sludge between the lower end portion of the rotary shaft and the Sosoko central portion of the reaction vessel to the lower end of the rotary shaft, stirring auxiliary blades a piece the can, A low speed carrier characterized in that its front face is offset from the center line of the rotating shaft and the mounting side end protrudes downward at a position deviated from the center line in a direction perpendicular to the offset direction. Floating machine.
JP31099798A 1998-10-30 1998-10-30 Low speed carrier floating machine Expired - Fee Related JP4230023B2 (en)

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Application Number Priority Date Filing Date Title
JP31099798A JP4230023B2 (en) 1998-10-30 1998-10-30 Low speed carrier floating machine

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Application Number Priority Date Filing Date Title
JP31099798A JP4230023B2 (en) 1998-10-30 1998-10-30 Low speed carrier floating machine

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JP4230023B2 true JP4230023B2 (en) 2009-02-25

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JP5329021B2 (en) * 2005-04-06 2013-10-30 株式会社西原環境 Sewage treatment equipment
JP5117065B2 (en) * 2007-02-16 2013-01-09 株式会社西原環境 Supporting biological treatment equipment
CN110697886A (en) * 2019-10-22 2020-01-17 黄冲英 Precipitation reaction tank for sewage treatment process

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