WO2017221346A1 - Agitateur d'aération - Google Patents

Agitateur d'aération Download PDF

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Publication number
WO2017221346A1
WO2017221346A1 PCT/JP2016/068511 JP2016068511W WO2017221346A1 WO 2017221346 A1 WO2017221346 A1 WO 2017221346A1 JP 2016068511 W JP2016068511 W JP 2016068511W WO 2017221346 A1 WO2017221346 A1 WO 2017221346A1
Authority
WO
WIPO (PCT)
Prior art keywords
stirring blade
aeration
air diffuser
tank
air
Prior art date
Application number
PCT/JP2016/068511
Other languages
English (en)
Japanese (ja)
Inventor
好一 加藤
一水 立川
勝美 藤田
淳也 西脇
Original Assignee
佐竹化学機械工業株式会社
メタウォーター株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 佐竹化学機械工業株式会社, メタウォーター株式会社 filed Critical 佐竹化学機械工業株式会社
Priority to PCT/JP2016/068511 priority Critical patent/WO2017221346A1/fr
Publication of WO2017221346A1 publication Critical patent/WO2017221346A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • 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

Definitions

  • the present invention is applied to a sewage (sewage) treatment facility using activated sludge treatment (biological treatment), for example, an aerobic / anaerobic tank or an aerobic tank of a standard reaction tank having a water depth of 7 m or less.
  • activated sludge treatment biological treatment
  • the present invention relates to an aeration stirrer.
  • activated sludge process In a sewage treatment facility for the purpose of purifying sewage, biological treatment called the activated sludge process is performed to decompose and remove organic substances in the sewage.
  • This activated sludge method is an aerobic microorganism treatment, and when the activated sludge method is carried out, it is necessary to send air (oxygen) into the sewage in order for the activated sludge (microorganism) to absorb the pollutant (organic matter).
  • an aeration tank is used.
  • Such a general aeration tank is usually composed of a water tank and an air diffuser disposed on the bottom thereof with an area of about 2/3 from the entire surface.
  • aerobic biological treatment for removing BOD hereinafter referred to as “aerobic operation”
  • an underwater agitation type aeration apparatus capable of switching to an anaerobic biological treatment hereinafter referred to as “anaerobic operation” for removing phosphorus is mainly applied.
  • Such an underwater agitating aeration apparatus is further provided with an agitating device having an agitating blade (impeller) in the above-mentioned general aeration tank, and the air discharged from the air diffuser disposed at the lower portion of the agitating blade, It is sheared mechanically by a stirring blade into small bubbles, and the small bubbles are pushed downward by a discharge flow formed by the stirring blade, and reach the water surface from the bottom in the water tank formed by the discharge flow.
  • the oxygen is dissolved while being fed into the circulating flow of the range and stirring in the tank, and switching operation between an aerobic operation and an anaerobic operation is performed according to the required amount of oxygen with respect to the inflowing water quality.
  • the underwater agitating type aeration apparatus using such an agitating device disperses the bubble diameter finely and further pushes the bubbles into the water to improve the residence time and increase the oxygen dissolution rate.
  • the bubbles sheared by the stirring blades are about 3 to 7 mm in diameter and relatively large. Therefore, oxygen in the air does not dissolve efficiently in the water, and it is necessary to supply a large amount of oxygen in order to supply the necessary amount of oxygen. As in the case of using a general aeration tank, a large amount of power is required. Necessary.
  • cited reference 1 and cited reference 2 are provided.
  • This invention is made
  • the place made into the subject is suppressing motive energy, when supplying oxygen required for biological treatment (activated sludge process) in water. It is to provide energy saving aeration means.
  • development of a high-efficiency aeration stirrer that solves these problems greatly extends the residence time of bubbles, and improves oxygen dissolution efficiency with low power without entanglement of bubbles in the stirring blades. It came to.
  • the present invention provides a tank for storing a processing solution, an air diffuser having an air diffuser for discharging fine bubbles, and a gas diffuser provided in the tank, above the air diffuser.
  • a stirring blade that is rotated by a driving device, and a control unit that controls the driving device, and the air diffusion portion is a projection surface of the air diffusion portion with respect to the bottom surface of the air diffusion portion.
  • the stirring blade is provided so as not to overlap a projection surface with respect to the bottom surface, and the control means controls the driving device when the fine bubbles are discharged into the tank from the air diffuser to The wing is rotated.
  • the agitating blade is provided at a position where the fine air bubbles discharged by the aeration unit can be taken in by the agitation blade rotating with respect to the aeration unit, and the control means includes the rotating agitation unit.
  • the wings take in the fine bubbles discharged from the air diffuser and rotate them at a rotation speed that allows them to be discharged downward.
  • the air diffuser of the air diffuser is formed in an annular shape, and the stirring blade is provided above the inside of the air diffuser formed in the annular shape.
  • the diameter of a virtual circle that is insertable into the annularly formed air diffuser and has the maximum size and coaxial with the axis of the stirring blade is 1 with respect to the diameter of the stirring blade.
  • the air diffuser is formed so as to be not less than 0.0 and not more than 4.0 times.
  • the stirring blade is provided at a position between 10% and 50% of the water depth from the water surface.
  • the fine bubbles discharged from the air diffuser and rising are not pushed downward, at least, Since the fine bubbles on the side and / or upper part of the stirring blade are taken in (sucked), discharged downward, and recirculated to retain the fine bubbles, like a conventional underwater aeration apparatus. Since the rising bubbles are not pushed in and the bubbles are not entangled without shearing the bubbles, the fine bubbles can be retained with low power.
  • the power unit is above the water tank or above the water surface in the water tank, it is an aeration stirrer that can be easily inspected on the tank and can be easily maintained.
  • FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a cross-sectional top view of the other aeration stirring apparatus of Example 1 of this invention. It is a cross-sectional top view of the further another aeration stirring apparatus of Example 1 of this invention. It is a figure which shows typically the flow of the process liquid in the water tank in the aerobic operation of the aeration stirring apparatus of Example 1 of this invention, and the state of the flow of bubbles. It is a figure which shows typically the state of the flow of the process liquid in the water tank in the anaerobic operation of the aeration stirring apparatus of Example 1 of this invention. It is a vertical side view of the stirring apparatus using the conventional OD method.
  • Embodiment 1 of the present invention will be described with reference to FIGS.
  • the aeration stirring apparatus 1 of the present invention includes a water tank 2, a stirring means 3 for stirring a treatment liquid (for example, sewage) in the water tank 2, and a bottom portion in the water tank 2.
  • the header pipe 4 is provided, and the air diffuser 5 is fixed to and communicates with the header pipe 4.
  • the water tank 2 is a bottomed rectangular or circular standard tank used at a water depth of 7 m or less, for example.
  • the upper surface of the water tank is not particularly limited, and may have an upper part opened or a ceiling part.
  • the stirring means 3 is connected to, for example, a driving device 6 such as a motor provided on the water tank 2 or above the water surface in the water tank 2, and the driving device 6 suspended from the center of the water tank 2.
  • a driving device 6 such as a motor provided on the water tank 2 or above the water surface in the water tank 2, and the driving device 6 suspended from the center of the water tank 2.
  • a rotating shaft (shaft) 7, an axial flow type stirring blade 8 that is fixed to the lower end of the rotating shaft 7 and discharges treated water directly below the vertical direction, and the drive device 6 to control the stirring It comprises an agitation device comprising control means 9 for rotating the blade 8 by a predetermined amount.
  • control means 9 controls the driving device 6 to rotate the stirring blade 8 when bubbles are discharged from the air diffusion means 5 into the tank, whereby the processing liquid (sewage water) in the water tank is rotated. ) Is discharged downward by a predetermined amount.
  • the stirring blade 8 causes at least the fine bubbles discharged from the aeration means 5 by the stirring blade 8 rotating to the aeration means 5 described in detail later.
  • the control means 9 is provided at a position where it can be taken in (suctioned) from the side and / or from above, and the control means 9 is provided with the rotating stirrer blades 8 to cause the fine bubbles discharged from the air diffuser means 5 to be laterally and Incorporating from the upper side and rotating at a rotation speed capable of discharging downward, a circulating flow is formed by the downward discharging flow, and the fine bubbles are recirculated by the circulating flow.
  • the number of rotations for rotating the stirring blade 8 by the control means 9 can be controlled to the number of rotations until the discharge flow reaches an arbitrary depth of the water tank, but the number of rotations of the stirring blade 8 is The minimum number of rotations that can form the discharge flow is sufficient.
  • the power of the stirring means 3 is a circulating flow that causes the liquid in the water tank 2 to reach the bottom of the tank and circulates the entire tank when the air diffuser 5 discharges the bubbles into the water tank 2. It is sufficient that the stirring blade 8 can be rotated with a low power enough to take in the fine bubbles passing through the side of the stirring blade 8 and discharge downward, without requiring power to form .
  • the depth reaching the lower side of the discharge flow can be set to an arbitrary depth deeper than the position of the stirring blade 8 and higher than the bottom surface of the water tank 2.
  • the stirring means 3 is preferably an axial flow type stirring blade 8, but is not limited to this as long as it generates a downward flow.
  • the header pipe 4 is, for example, a circular annular (loop-shaped) hollow vent pipe, and is provided at the bottom of the water tank 2, for example, coaxially with the rotating shaft 7 of the stirring blade 8. .
  • Such bottom includes the bottom of the aquarium and a position away from the bottom by a predetermined distance.
  • the header pipe 4 has a projection surface of the stirring blade 8 at the time of rotation with respect to the bottom surface of the water tank 2 (the projection surface is a projection surface when the bottom surface is viewed from directly above; the same applies hereinafter).
  • the header pipe 4 is provided so as not to overlap the projection surface with respect to the bottom surface, and is disposed, for example, outside the diameter of the stirring blade 8.
  • the header pipe 4 may have a polygonal annular shape (loop shape) as shown in FIG. 4 in addition to a circular annular shape (loop shape). Further, the annular (loop-shaped) header pipe 4 may be partially cut away (not shown).
  • the header pipe 4 may be one in which a plurality of linear header pipe elements 4 a are arranged in a ring (loop shape) apart from each other.
  • the header tube element 4a may be a curved or bent header element in addition to a straight line shape, and a combination of different shapes of the header tube element 4a is formed into a ring shape (loop shape). Also good.
  • the air diffuser 5 includes, for example, a plurality of cylindrical long diffused gas 10 having the same shape, and a diffused portion having a plurality of fine holes for releasing fine bubbles on a part of the surface of the diffused gas 10.
  • the plurality of diffused gases 10 have their connecting portions 10a spaced apart from each other at a predetermined interval, for example, an equal interval, on the inner peripheral surface 4b and the outer peripheral surface 4c of the hollow header tube 4, for example.
  • the diffused gas 10 is disposed so as to extend radially with respect to the rotating shaft 7 of the stirring blade 8, and the plurality of diffused gases 10 form one diffused gas, and the diffused gas is diffused.
  • the air part is formed in an annular shape (loop shape).
  • tube 4 and each diffused gas 10 are arrange
  • the material and shape of the air diffuser 10 are not limited as long as air is discharged from the fine holes.
  • the material of the air diffuser may be ceramic or synthetic. There are a resin-made one and a fabric formed by stretching a cloth in which fine holes are formed.
  • the shape of the diffused gas 10 is preferable as long as it has a large projected area with a small projected area with respect to the bottom surface of the water tank. It may be a shape.
  • the diffuser part of the diffused gas 10 may be, for example, a diffused part of which the front surface and the back surface are diffused parts, or the diffused gas 10 is cylindrical, if the diffused gas 10 is plate-shaped. If there is, for example, there is one in which the entire circumferential surface becomes an air diffuser.
  • the air diffuser is a concept that includes a place where such fine bubbles are separated from the air diffuser.
  • the fine holes include, for example, holes having a diameter of about 50 to 500 ⁇ m when the opening area is converted to a perfect circle, and slits having a width of 50 to 500 ⁇ m and a length of about 0.5 to 2 mm.
  • the diffused portion of the diffused gas 10 of the diffuser means 5 is discharged from the diffused gas 10, and the fine bubbles rising right above are generated by the axial flow directly below due to the rotation of the rotary blade 8.
  • the diffused portion of the diffused gas 10 of the diffuser means 5 is projected onto the bottom surface of the water tank 2 during rotation and the bottom surface of the diffused portion so as not to be pushed downward.
  • the air diffuser is disposed outside the diameter of the stirring blade 8 and is formed in, for example, the annular shape (loop shape).
  • the stirring blade 8 is provided above the inside of the air diffuser.
  • the diffused gas 10 is formed so as to be 3.0 times, thereby extending the residence time of fine bubbles and entanglement with the stirring blade. It becomes possible to suppress.
  • the air from the air diffusing means 5 is agitated by disposing the agitating blade 8 from the water surface at a position of 10% to 50%, particularly preferably 25% of the tank water depth. Entanglement to the wing is suppressed.
  • 12 is an air supply source (blower) which sends air to the header pipe
  • air is sent from the air supply source 12 to the air diffuser 10 of the air diffuser 5 via the air supply pipe 13 and the header pipe 4.
  • air is discharged into the processing liquid from the fine holes formed in the diffused portion of the diffused gas 10, and the control means 9 is controlled to rotate the stirring blade 8 by the driving device 6, thereby rotating it.
  • the fine bubbles discharged from the air diffuser 8 are taken in at least from the side and / or above by the stirring blade 8 and discharged downward.
  • the rotation of the stirring blade 8 is controlled by the control means, and a downward flow is formed by the discharge of the stirring blade, and a circulating flow that circulates the captured fine bubbles around the stirring blade is generated. What is necessary is just to rotate by the rotation speed of the grade which can be formed.
  • FIG. 6 shows a diagram in which the stirring blade 8 takes in the fine bubbles on the side and the upper side of the stirring blade 8 and discharges them downward, and the bubbles are recirculated in the vicinity of the stirring blade 8.
  • FIG. 6 the right side of the drawing shows the state of the treatment liquid flow in the water tank 2, and the left side of the drawing schematically shows the state of the flow of fine bubbles.
  • the stirring blade 8 does not push the rising fine bubbles downward, does not entangle the rising bubbles to the stirring blade, does not reduce the discharge action of the stirring blade, and despite low power, It becomes possible to extend the residence time of the fine bubbles.
  • the aeration stirrer 1 of the present invention causes the agitating blade 8 and the air diffuser 5 to move between the natural flow formed by the air bubbles from the air diffuser (particularly the rise that occurs when the fine air bubbles are released from the air diffuser.
  • the stirring blade can be rotated so as not to hinder the flow), and a circulating flow is formed in the vicinity of the stirring blade by the stirring blade 8 so that the fine bubbles from the aeration means 5 are allowed to rotate.
  • the oxygen dissolution rate is increased by extending the residence time of bubbles to increase the oxygen dissolution rate, and the oxygen dissolution efficiency can be increased with extremely low stirring power.
  • the aeration agitating apparatus of the present invention is not used to shear and disperse the agitating blade in order to generate fine bubbles, and at the time of aeration
  • the stirring blade is not rotated with high power, and the rising bubbles are not suppressed, and the rising bubbles are not entangled. It is not necessary to rotate the motor at a high speed, and therefore, less power energy is required for the motor for stirring.
  • the contact area with water is larger than bubbles that are not fine, so oxygen in the air is easy to dissolve in the water, and the amount of air to supply the required amount of oxygen is low. Less energy is required and the power energy required for the air supply source can be reduced.
  • fine bubbles since fine bubbles have a small buoyancy, they tend to stay in the water tank due to the water flow from the stirring blade, and stay in the entire water tank for a long time. It can be dissolved in.
  • the released air can be made into fine bubbles.
  • the oxygen dissolution efficiency was 20% in the conventional apparatus (in-water stirring type aeration apparatus), but in the present invention, it was 25% to 33%, and oxygen could be supplied efficiently.
  • the stirring power can be set to 4 W / m 3 or less in the present invention compared with 5 to 6 W / m 3 in the conventional apparatus, and a high energy saving effect is obtained.
  • the virtual circle 11 inserted into the inner side surrounded by the inner end of the cylindrical diffused gas (or diffused part) connected to the inner peripheral surface 4b of each header pipe 4
  • the diameter is particularly preferably 3.0 times so that the diameter is 1.0 to 4.0 times (or greater than 1.0 and 4.0 times or less) with respect to the diameter of the stirring blade.
  • the air from the air diffuser 5 is agitated by disposing the stirring blade from the water surface at a position between 10% and 50% of the tank water depth, particularly preferably at a position of 25%. Entanglement to the wing is suppressed.
  • the air supply means can be used to disperse the aeration means at a water depth. It is not necessary to update the air source, and the cost can be reduced.
  • the stirring power is only 1 W / m 3 or less, a circulation flow that circulates in the water tank can be formed, and anaerobic operation can be performed with low power.
  • FIG. 7 is a diagram schematically showing the state of the treatment liquid flow in the water tank 2.
  • the drive device 6 of the stirring means 3 is provided above the water tank or above the water surface in the water tank, the daily inspection can be easily performed on the water tank, compared with the conventional underwater stirring aeration apparatus, There are few maintenance and inspection work items, and maintenance is easy.
  • the stirring device of the present invention is used in sewage treatment facilities, sewage treatment facilities, and the like.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

La présente invention vise à fournir un agitateur d'aération à haut rendement étant de faible puissance et dont l'efficacité de dissolution d'oxygène est améliorée. À cet effet, la présente invention est caractérisée en ce qu'elle comprend : un réservoir pour stocker un liquide de traitement ; un moyen de diffusion d'air muni d'une partie de diffusion d'air pour évacuer des bulles fines, la partie de diffusion d'air étant disposée à l'intérieur du réservoir ; une turbine tournée par un dispositif d'entraînement, la turbine étant disposée au-dessus de la partie de diffusion d'air ; et un moyen de commande pour commander le dispositif d'entraînement ; la partie de diffusion d'air étant disposée de telle sorte qu'un plan de projection de la partie de diffusion d'air par rapport à une surface inférieure et un plan de projection de la turbine par rapport à la surface inférieure ne sont pas superposés par rapport à la turbine, et le moyen de commande commandant au dispositif d'entraînement d'amener la turbine à tourner lorsque des bulles fines sont évacuées dans le réservoir depuis la partie de diffusion d'air.
PCT/JP2016/068511 2016-06-22 2016-06-22 Agitateur d'aération WO2017221346A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/068511 WO2017221346A1 (fr) 2016-06-22 2016-06-22 Agitateur d'aération

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Application Number Priority Date Filing Date Title
PCT/JP2016/068511 WO2017221346A1 (fr) 2016-06-22 2016-06-22 Agitateur d'aération

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WO2017221346A1 true WO2017221346A1 (fr) 2017-12-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661261A (zh) * 2020-12-30 2021-04-16 周子富 一种污水处理曝气搅拌设备
WO2024061703A1 (fr) * 2022-09-19 2024-03-28 Global Life Sciences Solutions Usa Llc Ensembles diffuseurs pour un système de biotraitement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009039673A (ja) * 2007-08-10 2009-02-26 Hitachi Plant Technologies Ltd 廃水処理装置及び廃水処理方法
JP2012125692A (ja) * 2010-12-15 2012-07-05 Metawater Co Ltd 散気筒

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009039673A (ja) * 2007-08-10 2009-02-26 Hitachi Plant Technologies Ltd 廃水処理装置及び廃水処理方法
JP2012125692A (ja) * 2010-12-15 2012-07-05 Metawater Co Ltd 散気筒

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661261A (zh) * 2020-12-30 2021-04-16 周子富 一种污水处理曝气搅拌设备
WO2024061703A1 (fr) * 2022-09-19 2024-03-28 Global Life Sciences Solutions Usa Llc Ensembles diffuseurs pour un système de biotraitement

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