CN113636660B - Corridor type aeration tank - Google Patents

Corridor type aeration tank Download PDF

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Publication number
CN113636660B
CN113636660B CN202110886423.8A CN202110886423A CN113636660B CN 113636660 B CN113636660 B CN 113636660B CN 202110886423 A CN202110886423 A CN 202110886423A CN 113636660 B CN113636660 B CN 113636660B
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screen
end screen
perforated pipe
flow rate
pipe network
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CN113636660A (en
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梁仁礼
马浩亮
王洪艳
杨苗青
王京玉
张相辉
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South China University of Technology SCUT
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South China University of Technology SCUT
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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
    • C02F7/00—Aeration of stretches of water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

The invention relates to the technical field of sewage treatment, and discloses a gallery type aeration tank.A left side and a right side of a horizontal screen are respectively connected with a left side wall and a right side wall of a tank body, the bottom of an inlet end screen and the bottom of an outlet end screen are respectively connected with the front end and the rear end of the horizontal screen, the horizontal screen is separated from the bottom wall of the tank body, the two sides of the inlet end screen and the two sides of the outlet end screen are both connected with the left side wall and the right side wall of the tank body, the horizontal screen, the inlet end screen and the outlet end screen and the left side wall and the right side wall of the tank body are enclosed to form a filler cavity provided with suspended fillers, aeration discs are uniformly distributed on the bottom wall of the tank body, a first perforated pipe network is arranged on the front side of the inlet end screen, and a second perforated pipe network is arranged on the rear side of the outlet end screen; the liquid inlet end of the reflux device is arranged at the rear end of the filling cavity, and the liquid outlet end of the reflux device is arranged at the front end of the filling cavity; the invention can improve the utilization rate of oxygen, strengthen the water treatment effect and treatment capacity and effectively prevent the fluidized suspended filler from causing blockage.

Description

Corridor type aeration tank
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a gallery type aeration tank.
Background
With the development of social economy, the effluent discharge standard of domestic sewage treatment plants is continuously improved, the sewage treatment plants need to be upgraded and modified, and corresponding treatment facilities are added to meet the new standard, but the site of part of the sewage treatment plants is limited, so that the standard extraction is difficult or the cost is too high. Therefore, in the existing aeration tank, the suspended filler is added to form an MBBR sludge film composite process, the biochemical treatment effect of the aeration tank is improved by increasing the microbial biomass and the microbial population, and the air bubbles are finer due to the collision and shearing action of the suspended filler in water, so that the utilization rate of oxygen is increased. In addition, each carrier has different biological species inside and outside, anaerobic bacteria or facultative bacteria grow inside, aerobic bacteria grow outside, each carrier is a micro-reactor, so that nitrification reaction and denitrification reaction exist simultaneously, the aim of enhancing denitrification is achieved, and the treatment efficiency is greatly improved.
Because the density of the filler is generally close to that of water, the filler sinks when a certain amount of sludge is attached to the static sewage, the filler rises when small bubbles are attached to the static sewage, and the filler in the aeration tank is in a fluidized state under the action of aeration and the lifting action of water flow. Aeration tank delivery port department often sets up the screen cloth in order to avoid filling the loss, but causes easily to block up to overflow, damages processing system, in actual engineering, also appears local packing accumulational phenomenon very easily in the pond.
Disclosure of Invention
The invention aims to provide a gallery type aeration tank which can improve the utilization rate of oxygen, strengthen the water treatment effect and treatment capacity and effectively prevent fluidized suspended fillers from causing blockage.
In order to achieve the above purpose, the invention provides a gallery type aeration tank, which comprises a tank body, an inlet end screen, an outlet end screen, a horizontal screen and a reflux device, wherein the left side and the right side of the horizontal screen are respectively connected with the left side wall and the right side wall of the tank body, the bottom of the inlet end screen and the bottom of the outlet end screen are respectively connected with the front end and the rear end of the horizontal screen, the horizontal screen is separated from the bottom wall of the tank body, the length of the horizontal screen is smaller than that of the bottom wall of the tank body, the two sides of the inlet end screen and the two sides of the outlet end screen are both connected with the left side wall and the right side wall of the tank body, a packing cavity is formed by enclosing the horizontal screen, the inlet end screen, the outlet end screen and the left side wall and the right side wall of the tank body, suspended packing is arranged in the packing cavity, an aeration disc is uniformly distributed on the bottom wall of the tank body, a first perforation pipe network is arranged on the front side of the inlet end screen, the air outlet of the first perforated pipe network faces the inlet end screen, a second perforated pipe network is arranged on the rear side of the outlet end screen, and the air outlet of the second perforated pipe network faces the outlet end screen; the liquid inlet end of the backflow device is arranged at the rear end of the filling cavity and close to the outlet end screen, and the liquid outlet end of the backflow device is arranged at the front end of the filling cavity and close to the inlet end screen.
As a preferable scheme of the invention, a first flow rate sensor is arranged on the rear side of the inlet end screen, and a second flow rate sensor is arranged on the rear side of the outlet end screen;
when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the first perforated pipe network is started, when the blockage clearing time reaches a preset time value, the first perforated pipe network stops working, the first flow velocity sensor detects the flow velocity value again, when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the operation is repeated until the first flow velocity sensor detects that the flow velocity value is higher than the set minimum flow velocity value, and the first perforated pipe network is kept in a stop state;
when the second flow rate sensor detects that the flow rate value is lower than the set minimum flow rate value, the first flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, the second perforated pipe network is started, when the blockage clearing time reaches the preset time value, the second perforated pipe network stops working, the second flow rate sensor detects the flow rate value again, when the second flow rate sensor detects that the flow rate value is smaller than the set minimum flow rate value, the operation is repeated until the second flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, and the second perforated pipe network is kept in a stop state.
As a preferable scheme of the present invention, the reflux device includes a reflux pipe and a plurality of gas stripping reflux mechanisms, each gas stripping reflux mechanism includes a riser and an air inlet pipe communicated with a pipe cavity of the riser, each riser is provided with a valve, the riser is located in the rear end of the packing cavity, an inlet of the reflux pipe is connected with the top end of each riser, and an outlet of the reflux pipe is communicated with the upper portion of the front end of the packing cavity.
As a preferable scheme of the invention, the depth of each riser extending into the filling cavity is different.
As a preferable scheme of the invention, the liquid inlet at the tail end of the riser is trumpet-shaped.
As a preferable aspect of the present invention, a first perforated pipe is disposed on a rear side of the inlet end screen, a second perforated pipe is disposed on a front side of the outlet end screen, the first perforated pipe and the first perforated pipe network start and stop synchronously, and the second perforated pipe network start and stop synchronously.
According to the preferable scheme of the invention, the aperture ratio of the horizontal screen, the inlet end screen and the outlet end screen is 40-50%, and the aperture of the apertures of the horizontal screen, the inlet end screen and the outlet end screen is smaller than the diameter of the suspended filler.
As a preferable scheme of the invention, the suspension filler is polyurethane sponge suspension filler, and the specific surface area of the suspension filler is more than 4000m2/m3。
As a preferable scheme of the invention, the adding ratio of the suspended filler is 25-40%.
As a preferred aspect of the present invention, the inlet end screen and the outlet end screen are both vertically arranged.
Compared with the prior art, the gallery type aeration tank provided by the embodiment of the invention has the beneficial effects that:
according to the invention, bubbles formed when the aeration disc at the bottom of the tank body is oxygenated are pushed by rising buoyancy, and the rising bubbles are blocked by the horizontal screen and the suspended filler and are divided into finer bubbles, so that the oxygen utilization rate is further improved, the operation cost is further saved, the vertical fluidity of the filler and the mass transfer capacity of a system are ensured, and the water treatment effect and the treatment capacity are further enhanced; by arranging the first perforated pipe network and the second perforated pipe network, the suspended filler can be effectively prevented from being blocked on the inlet end screen and the outlet end screen, and the inlet end screen, the outlet end screen and the horizontal screen are enclosed to form a filler cavity, so that the suspended filler can be intercepted and separated, the fluidized suspended filler is effectively prevented from blocking overflowing water and entering a subsequent treatment system, and the stability of system operation is greatly improved; in addition, the reflux device can reflux the mixed liquid mixed with the suspended filler at the rear end of the filler cavity to the front end of the filler cavity, so that the suspended filler is prevented from being accumulated and the horizontal fluidity and the mass transfer capacity of the suspended filler are increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a top view of a gallery-type aeration tank provided by the present invention;
FIG. 2 is a side view of a gallery aeration tank provided by the present invention;
FIG. 3 is a schematic structural diagram of a reflow apparatus provided in the present invention;
in the figure, 1 is a tank body; 11 is a water inlet of the tank body; 12 is a water outlet of the tank body; 2 is an inlet end screen; 21 is a first perforated pipe network; 22 is a first perforated tube; 3 is an outlet end screen mesh; 31 is a second perforated pipe network; 32 is a second perforated tube; 4 is a horizontal screen; 5 is a reflux device; 51 is a return pipe; 52 is a riser; 521 is a liquid inlet; 53 is an air inlet pipe; 54 is a gas supply pipe; 6 is an aeration disc.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a gallery type aeration tank according to a preferred embodiment of the present invention includes a tank body 1, an inlet end screen 2, an outlet end screen 3, a horizontal screen 4 and a backflow device 5, wherein left and right sides of the horizontal screen 4 are respectively connected to left and right side walls of the tank body 1, a bottom of the inlet end screen 2 and a bottom of the outlet end screen 3 are respectively connected to front and rear ends of the horizontal screen 4, the horizontal screen 4 is separated from a bottom wall of the tank body 1, a length of the horizontal screen 4 is smaller than a length of the bottom wall of the tank body 1, both sides of the inlet end screen 2 and both sides of the outlet end screen 3 are connected to left and right side walls of the tank body 1, the horizontal screen 4, the inlet end screen 2 and the outlet end screen 3 enclose with the left and right side walls of the tank body 1 to form a filling cavity, and suspended fillers are disposed in the filling cavity, aeration discs 6 are uniformly distributed on the bottom wall of the tank body 1, the aeration discs 6 are preferably microporous aeration discs 6, a first perforated pipe network 21 is arranged on the front side of the inlet end screen 2, the air outlet of the first perforated pipe network 21 faces the inlet end screen 2, a second perforated pipe network 31 is arranged on the rear side of the outlet end screen 3, and the air outlet of the second perforated pipe network 31 faces the outlet end screen 3; the liquid inlet end of the reflux device 5 is arranged at the rear end of the packing cavity and is close to the outlet end screen 3, the liquid outlet end of the reflux device 5 is arranged at the front end of the packing cavity and is close to the inlet end screen 2, the water inlet 11 of the tank body is arranged on the left side wall of the front end or the right side wall of the front end of the tank body 1, the water outlet 12 of the tank body is arranged on the right side wall of the front end or the left side wall of the front end of the tank body 1, and the water inlet 11 of the tank body and the water outlet 12 of the tank body are arranged on different sides, so that the path length is ensured; note that the direction of the arrow in fig. 1 is a water flow direction.
Illustratively, a first flow sensor is arranged at the rear side of the inlet end screen 2, and a second flow sensor is arranged at the rear side of the outlet end screen 3;
when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the first perforated pipe network 21 is started, when the blockage clearing time reaches a preset time value, the first perforated pipe network 21 stops working, the first flow velocity sensor detects the flow velocity value again, when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the operations are repeated until the first flow velocity sensor detects that the flow velocity value is higher than the set minimum flow velocity value, and the first perforated pipe network 21 is kept in a stop state; whether the inlet screen 2 is blocked can be known by detecting the flow velocity of water at the rear side of the inlet screen 2, so that a main controller of the gallery type aeration tank judges whether to start the first perforated pipe network 21 to clear the inlet screen 2, and the flow velocity of water at the rear side of the inlet screen 2 is detected after the first perforated pipe network 21 stops working, so that the subsequent detection flow velocity value is accurate and is not influenced by the working of the first perforated pipe network 21, when the first flow velocity sensor detects that the flow velocity value is greater than the set minimum flow velocity value, the first perforated pipe network 21 finally stops working, the first perforated pipe network 21 is prevented from working all the time, the running cost is improved, the inlet screen 2 is effectively cleared, and the cost is saved;
when the second flow rate sensor detects that the flow rate value is lower than the set minimum flow rate value, the first flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, the second perforated pipe network 31 is started, when the blockage clearing time reaches the preset time value, the second perforated pipe network 31 stops working, the second flow rate sensor detects the flow rate value again, when the second flow rate sensor detects that the flow rate value is smaller than the set minimum flow rate value, the operations are repeated until the second flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, and the second perforated pipe network 31 is kept in a stop state; whether the outlet end screen 3 is blocked or not can be known by detecting the flow velocity of water flow at the rear side of the outlet end screen 3, and whether the second perforated pipe network 31 is started to clear the outlet end screen 3 or not can be judged by a main controller of the gallery type aeration tank with the inlet end screen 2 unblocked, so that the accuracy of detection data is influenced when the inlet end screen 2 is prevented from being blocked, the flow velocity of water flow at the rear side of the inlet end screen 3 can be detected after the second perforated pipe network 31 stops working, the accuracy of subsequent detection flow velocity values is ensured, the influence of the working of the second perforated pipe network 31 is avoided, when the second flow velocity sensor detects that the flow velocity value is larger than the set minimum flow velocity value, the second perforated pipe network 31 finally stops working, the second perforated pipe network 31 is prevented from working all the time, the running cost is improved, the blockage of the outlet end screen 3 is effectively cleared, and the cost is saved; can clear stifled processing to entrance point screen cloth 2, exit end screen cloth 3 according to real-time rivers situation in the cell body 1, effectively avoid entrance point screen cloth 2, exit end screen cloth 3 to block up when practicing thrift the cost.
Illustratively, the reflux device 5 comprises a reflux pipe 51 and a plurality of stripping reflux mechanisms, each stripping reflux mechanism comprises a riser 52 and an air inlet pipe 53 communicated with a pipe cavity of the riser 52, each riser 52 is provided with an electric valve, each air inlet pipe 53 is connected with an air supply pipe 54, the risers 52 are located in the rear end of the filling cavity, an inlet of the reflux pipe 51 is connected with the top end of each riser 52, an outlet of the reflux pipe 51 is communicated with the upper part of the front end of the filling cavity, each riser 52 is controlled by an independent valve, the opening number of the stripping reflux mechanisms is reasonably adjusted in actual operation, and the system is more flexible in operation.
Illustratively, the depths of the risers 52 extending into the packing cavity are different, so that suspended fillers which can be located at different depths are conveyed to the front end of the packing cavity by the air stripping backflow mechanism in a backflow mode, the suspended fillers located at the rear end of the packing cavity are guaranteed to be conveyed to the front end in a backflow mode, the phenomenon that the suspended fillers located at the rear end are uneven in backflow is avoided, and the backflow effect of the suspended fillers is effectively improved.
Illustratively, the liquid inlet 521 at the end of riser 52 is flared to facilitate the introduction of the suspended filler into the liquid inlet 521 at the end of riser 52 and to avoid the suspended filler from being blocked at the liquid inlet 521 at the end of riser 52.
Illustratively, a first perforated pipe 22 is arranged on the rear side of the inlet end screen 2, a second perforated pipe 32 is arranged on the front side of the outlet end screen 3, the first perforated pipe 22 and the first perforated pipe network 21 are started and stopped synchronously, and the first perforated pipe 22 and the first perforated pipe network 21 are matched to better perform blockage clearing operation on the inlet end screen 2, so that the blockage clearing effect is improved; the second perforated pipe 32 and the second perforated pipe network 31 are started and stopped synchronously, and the second perforated pipe network are matched to better perform blockage clearing operation on the outlet end screen 3, so that the blockage clearing effect is improved.
Illustratively, the aperture opening ratios of the horizontal screen 4, the inlet end screen 2 and the outlet end screen 3 are all 40-50%, and the aperture opening diameters of the horizontal screen 4, the inlet end screen 2 and the outlet end screen 3 are smaller than the diameter of the suspended filler, so that the water passing capacity of the horizontal screen 4, the inlet end screen 2 and the outlet end screen 3 is good.
Illustratively, the suspension filler is polyurethane sponge suspension filler, and the specific surface area of the suspension filler is more than 4000m2/m3Porosity of 98%, the suspensionThe adding ratio of the filler is 25-40% so as to increase enough microbial biomass, greatly improve the system treatment load, effectively enhance the sewage treatment capacity, improve the treatment capacity by more than 1.5 times, obviously reduce the excess sludge and reduce the excess sludge by about 40%.
Illustratively, the inlet end screen 2 and the outlet end screen 3 are both vertically arranged, so that the suspended filler is prevented from being clamped into meshes of the inlet end screen 2 and the outlet end screen 3 in the bubble rising process.
In conclusion, the bubbles formed when the aeration disc 6 at the bottom of the tank body 1 is oxygenated are pushed by the rising buoyancy, and the rising bubbles are blocked by the horizontal screen 4 and the suspended filler and are divided into finer bubbles, so that the oxygen utilization rate is further improved, the electricity charge of the aeration system can be saved by 15 percent, the operation cost is saved, the vertical fluidity of the filler and the mass transfer capacity of the system are ensured, and the water treatment effect and the treatment capacity are further enhanced; by arranging the first perforated pipe network 21 and the second perforated pipe network 31, the suspended filler can be effectively prevented from being blocked on the inlet end screen 2 and the outlet end screen 3, and a filler cavity is formed by enclosing the inlet end screen 2, the outlet end screen 3 and the horizontal screen 4, so that the suspended filler can be intercepted and separated, the fluidized suspended filler is effectively prevented from blocking overflowing water and entering a subsequent treatment system, and the stability of system operation is greatly improved; in addition, the mixed liquid mixed with the suspended filler at the rear end of the filler cavity can flow back to the front end of the filler cavity through the reflux device 5, so that the suspended filler is prevented from being accumulated and the horizontal fluidity and the mass transfer capacity of the suspended filler are increased.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (7)

1. The utility model provides a corridor formula aeration tank, its characterized in that includes cell body, entrance point screen cloth, exit end screen cloth, horizontal screen cloth and reflux unit, the left and right sides of horizontal screen cloth is connected respectively the left and right sides wall of cell body, the bottom of entrance point screen cloth, the bottom of exit end screen cloth is connected respectively both ends around the horizontal screen cloth, horizontal screen cloth with the diapire of cell body departs from mutually, the length of horizontal screen cloth is less than the length of the diapire of cell body, the both sides of entrance point screen cloth, the both sides of exit end screen cloth all with the left and right sides wall of cell body is connected, horizontal screen cloth, entrance point screen cloth, exit end screen cloth enclose with the left and right sides wall of cell body and close and form the packing chamber, the packing intracavity is arranged and is put suspension filler, the diapire equipartition of cell body has the aeration dish, the front side of entrance point screen cloth is equipped with first perforation pipe network, the air outlet of the first perforated pipe network faces the inlet end screen, a second perforated pipe network is arranged on the rear side of the outlet end screen, and the air outlet of the second perforated pipe network faces the outlet end screen; the liquid inlet end of the reflux device is arranged at the rear end of the packing cavity and is close to the outlet end screen, the liquid outlet end of the reflux device is arranged at the front end of the packing cavity and is close to the inlet end screen, the reflux device comprises a reflux pipe and a plurality of gas stripping reflux mechanisms, each gas stripping reflux mechanism comprises a riser and an air inlet pipe communicated with a pipe cavity of the riser, a valve is arranged on each riser, the risers are positioned at the rear end of the packing cavity, the depth of each riser extending into the packing cavity is different, the inlet of the reflux pipe is connected with the top end of each riser, and the outlet of the reflux pipe is communicated with the upper part of the front end of the packing cavity;
a first flow velocity sensor is arranged on the rear side of the inlet end screen, and a second flow velocity sensor is arranged on the rear side of the outlet end screen;
when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the first perforated pipe network is started, when the blockage clearing time reaches a preset time value, the first perforated pipe network stops working, the first flow velocity sensor detects the flow velocity value again, when the first flow velocity sensor detects that the flow velocity value is lower than the set minimum flow velocity value, the operation is repeated until the first flow velocity sensor detects that the flow velocity value is higher than the set minimum flow velocity value, and the first perforated pipe network is kept in a stop state; when the second flow rate sensor detects that the flow rate value is lower than the set minimum flow rate value and the first flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, the second perforated pipe network is started, when the blockage clearing time reaches the preset time value, the second perforated pipe network stops working, the second flow rate sensor detects the flow rate value again, when the second flow rate sensor detects that the flow rate value is smaller than the set minimum flow rate value, the operation is repeated until the second flow rate sensor detects that the flow rate value is larger than the set minimum flow rate value, and the second perforated pipe network is kept in a stop state.
2. The gallery-type aeration tank of claim 1, wherein the terminal liquid inlet of the riser is trumpet-shaped.
3. The gallery-type aeration tank of claim 1, wherein the inlet end screen has a first perforated pipe disposed on a rear side thereof, the outlet end screen has a second perforated pipe disposed on a front side thereof, the first perforated pipe and the first perforated pipe network start and stop in synchronization, and the second perforated pipe network start and stop in synchronization.
4. The gallery-type aeration tank of claim 1, wherein the horizontal screen, the inlet end screen and the outlet end screen each have an opening ratio of 40 to 50%, and the opening diameters of the horizontal screen, the inlet end screen and the outlet end screen are smaller than the diameter of the suspended filler.
5. The gallery-type aeration tank of claim 1, wherein the suspension packing is a polyurethane sponge suspension packing having a specific surface area of more than 4000m2/m3。
6. The gallery-type aeration tank of claim 5, wherein the addition ratio of the suspension packing is 25 to 40%.
7. The gallery aeration tank of claim 1, wherein the inlet end screen and the outlet end screen are both vertically disposed.
CN202110886423.8A 2021-08-03 2021-08-03 Corridor type aeration tank Active CN113636660B (en)

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CN113636660B true CN113636660B (en) 2022-07-08

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