CN220845731U - Sewage treatment biological aerated filter - Google Patents

Sewage treatment biological aerated filter Download PDF

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Publication number
CN220845731U
CN220845731U CN202322563280.4U CN202322563280U CN220845731U CN 220845731 U CN220845731 U CN 220845731U CN 202322563280 U CN202322563280 U CN 202322563280U CN 220845731 U CN220845731 U CN 220845731U
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China
Prior art keywords
filter
plate
biological
filter screen
aeration
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Application number
CN202322563280.4U
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Chinese (zh)
Inventor
王翔
王飞
师震岗
颜雪苹
王厚敏
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Shandong Haisi Environmental Engineering Co ltd
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Shandong Haisi Environmental Engineering Co ltd
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Abstract

The utility model discloses a sewage treatment biological aerated filter, which comprises a filter, a water inlet pipe, a water outlet pipe, a sewage pipe, a filter screen, a biological filter membrane, a lifting mechanism, an aeration cleaning mechanism and a vibration mechanism; the filter screen and the biological filter membrane are arranged in the filter tank, and the biological filter membrane is positioned above the filter screen; the water inlet pipe is positioned on the side wall of the filter tank below the filter screen, and the water outlet pipe is positioned on the side wall of the filter tank above the biological filter membrane; the lifting mechanism is fixed on the outer side wall of the filter tank and is connected with the biological filter membrane and the filter screen; the aeration cleaning mechanism is arranged in the filter chamber below the filter screen; the aeration cleaning mechanism comprises an aeration plate, a supporting plate, a fixed box, an electric push rod I, a turnover plate, a scraping plate, a screw rod II, a motor II, an electric push rod II, a torsion spring, a rotating shaft and a guide pipe. The utility model can clean the bottom of the filter tank, and can prevent the sludge which is not scraped clean from being brought back when the scraping plate returns, thereby being accumulated at one end of the filter tank far away from the sewage drain pipe.

Description

Sewage treatment biological aerated filter
Technical Field
The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment biological aerated filter.
Background
Biological filters have been widely used in sewage treatment, and the sedimentation area at the bottom of the existing filter often accumulates thicker silt, and is inconvenient to clean, so that the sewage treatment effect is easily affected.
The utility model provides a sewage treatment biological filter of patent application number CN202320425661.3, including the filter body, the driving motor is installed on the right side of the filter body, and driving motor's output shaft has the lead screw, and the surface of lead screw is connected with the fly leaf, and the below of fly leaf is connected with the guide bar, and the below of fly leaf is provided with the striking off board, and the inside of fly leaf is provided with the spring, and the lower surface of spring is connected with the connecting rod, and one side of the filter body is connected with the inlet tube, and the lower surface of the filter body is provided with the coupling shell, and the below of coupling shell is provided with the blow off pipe; the treatment process has the following defects: 1) The aeration piece is arranged at one end of the filter tank, so that the aeration range is smaller, and the growth of microorganisms in the biological filler layer is influenced; 2) When the bottom of the filter tank is cleaned, the sludge which is not scraped cleanly is brought back when the clean scraping plate returns, so that the sludge is accumulated at one end of the filter tank far away from the sewage drain pipe; 3) The filter screen and the biological filler layer are fixed on the filter tank body, and are inconvenient to detach and clean after being blocked for a long time.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide the sewage treatment biological aerated filter which can clean the bottom of the filter and prevent the unbreakable sludge from being brought back when the scraping plate returns, so that the unbreakable sludge is accumulated at one end of the filter far away from a sewage drain pipe.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
A sewage treatment aeration biological filter comprises a filter, a water inlet pipe, a water outlet pipe, a sewage discharge pipe, a filter screen, a biological filter membrane, a lifting mechanism, an aeration cleaning mechanism and a vibration mechanism; the filter screen and the biological filter membrane are arranged in the filter tank, and the biological filter membrane is positioned above the filter screen; the water inlet pipe is positioned on the side wall of the filter tank below the filter screen, and the water outlet pipe is positioned on the side wall of the filter tank above the biological filter membrane; the lifting mechanism is fixed on the outer side wall of the filter tank and is connected with the biological filter membrane and the filter screen; the aeration cleaning mechanism is arranged in the filter chamber below the filter screen; the vibration mechanism is connected with the filter screen and the biological filter membrane, and the sewage discharge pipe is positioned at the bottom end of the filter tank; sewage enters the filter tank through a water inlet pipe, is subjected to preliminary filtration of a filter screen and filtration and purification of a biological filter membrane, and is discharged through a water outlet pipe; the filter screen can filter some larger impurities in the sewage, so that the blocking condition of the biological filter membrane is effectively reduced; the aeration cleaning mechanism can convey oxygen into the filter tank, which is beneficial to the growth of microorganisms on the biological filter membrane, thereby enhancing the filtering effect of the biological filter membrane; when a large amount of sludge is deposited at the bottom of the filter tank, the aeration cleaning mechanism can scrape the sludge at the bottom of the filter tank and discharge the sludge through the blow-off pipe.
The aeration cleaning mechanism comprises an aeration plate, a supporting plate, a fixed box, an electric push rod I, a turnover plate, a scraping plate, a screw rod II, a motor II, an electric push rod II, a torsion spring, a rotating shaft and a guide pipe; the screw rod II is provided with a pair and is connected to the side wall of the filter tank through a bearing; the motor II is provided with a pair of screws which are fixed on the outer side wall of the filter tank, and the output shaft is connected with the corresponding screw rod II; the supporting plate is provided with a pair of screws which are connected with the corresponding screw rods II through threads; the two ends of the aeration plate are connected to the supporting plate through the fixed shaft, a plurality of uniformly arranged air outlets are arranged on the aeration plate, stirring blades are arranged at the bottom of the aeration plate, and water flow impacts on the stirring blades to enable the stirring blades to rotate, so that bubbles entering the filter tank can be scattered, and oxygen diffusion is facilitated; the conduit is a hose, one end of the conduit is connected with the aeration plate, and the other end of the conduit is connected with an external oxygen tank; the fixed box is provided with a pair of fixed at one end of the supporting plate and positioned below the screw rod II; the electric push rod I is fixed in the fixed box; the end of the turnover plate, which is far away from the connection with the aeration plate, is provided with a guide groove; the overturning plate is connected with the electric push rod I; one end of the turnover plate, which is far away from the connection with the aeration plate, is provided with a guide groove, the guide groove is rotationally connected in the guide groove of the turnover plate, one end of the scraping plate is connected with the rotation shaft, the top end of the scraping plate is an inclined plane extending towards the bottom end of the filter tank 1, and the bottom of the scraping plate is always contacted with the bottom of the filter tank; the electric push rod II is fixed in the guide groove of the turnover plate, the output end of the electric push rod II is connected with the end part of the rotating shaft, one end of the torsion spring is connected with the scraping plate, and the other end of the torsion spring is connected with the rotating shaft, so that the bottom of the scraping plate can be guaranteed to be attached to the filter tank; the motor provides power to drive the screw rod II to rotate, and the screw rod II drives the supporting plate to move through threads; the supporting plate drives the aeration plate to move along the screw rod II, so that oxygen sprayed out of the aeration plate can fully fill the whole filter tank with oxygen, and oxygen aggregation can be prevented, thereby affecting the growth of microorganisms in a local area in the biological filter membrane and leading to incomplete sewage purification; the electric push rod I provides power to drive the turnover plate to turn downwards by taking the rotating shaft as the center, the turnover plate drives the scraping plate to move downwards, and meanwhile, the electric push rod II drives the scraping plate to move along the turnover plate, so that the bottom of the scraping plate is contacted with the filter tank; then the scraper is driven to move along the screw rod II through the aeration plate, and the scraper cleans sludge at the bottom of the filter tank to a sewage drain pipe for discharging; then the scraping plate is retracted and returned to one end far away from the sewage pipe, and the bottom of the filter tank is cleaned again; not only can the bottom of the filter tank be cleaned, but also the sludge which is not scraped clean can be prevented from being brought back when the scraping plate returns, so that the sludge is accumulated at one end of the filter tank far away from the sewage drain pipe.
The lifting mechanism comprises a fixing frame, a lifting frame, a screw rod I and a motor I; the fixing frame is fixed on the outer side wall of the filter tank, two ends of the screw rod I are connected to two ends of the fixing frame through bearings, the motor I is fixed at the top end of the fixing frame, and the output shaft is connected with the screw rod I; one end of the lifting frame is connected with the filter screen, and the other end of the lifting frame is connected with the screw rod I through threads; the motor I provides power and drives screw I to rotate, and screw I drives the crane and removes along the mount, and the crane drives biological filter membrane and filter screen upward movement to conveniently dismantle biological filter membrane and filter screen and shift out the change.
The bottom of the filter screen is provided with a vibrating rod, and the vibrating mechanism comprises a spring and a spring guide rod; the spring guide rod penetrates through the biological filter membrane and is fixedly connected with the lifting frame, and the filter screen is movably connected to the spring guide rod; the spring guide rod penetrates through the spring, and the spring is arranged between the filter screen and the biological filter membrane; when the supporting plate moves along the screw rod II, the supporting plate is contacted with the vibrating rod at the bottom of the filter screen, the filter screen is driven to move upwards by the vibrating rod, and the spring is compressed; when the supporting plate is far away from the vibrating rod, the spring is restored to drive the filter screen to return to the original position, so that the filter screen is vibrated, and the filter screen can be prevented from being blocked.
Compared with the prior art, the utility model has the beneficial effects that:
1) The motor provides power to drive the screw rod II to rotate, and the screw rod II drives the supporting plate to move through threads; the supporting plate drives the aeration plate to move along the screw rod II, so that oxygen sprayed out of the aeration plate can fully fill the whole filter tank with oxygen, and oxygen aggregation can be prevented, thereby affecting the growth of microorganisms in a local area in the biological filter membrane and leading to incomplete sewage purification; the electric push rod I provides power to drive the turnover plate to turn downwards by taking the rotating shaft as the center, the turnover plate drives the scraping plate to move downwards, and meanwhile, the electric push rod II drives the scraping plate to move along the turnover plate, so that the bottom of the scraping plate is contacted with the filter tank; then the scraper is driven to move along the screw rod II through the aeration plate, and the scraper cleans sludge at the bottom of the filter tank to a sewage drain pipe for discharging; then the scraping plate is retracted and returned to one end far away from the sewage pipe, and the bottom of the filter tank is cleaned again; not only can clean the bottom of the filter tank, but also can prevent the sludge which is not scraped clean from being brought back when the scraping plate returns, thereby being accumulated at one end of the filter tank far away from the sewage drain pipe;
2) When the supporting plate moves along the screw rod II, the supporting plate is contacted with the vibrating rod at the bottom of the filter screen, the filter screen is driven to move upwards by the vibrating rod, and the spring is compressed; when the supporting plate is far away from the vibrating rod, the spring is restored to drive the filter screen to return to the original position, so that the filter screen is vibrated, and the filter screen can be prevented from being blocked.
Drawings
FIG. 1 is a schematic diagram of a sewage treatment biological aerated filter structure according to the utility model;
FIG. 2 is a schematic diagram of the internal structure of a sewage treatment biological aerated filter of the utility model;
FIG. 3 is an enlarged schematic view of the portion A of FIG. 2;
FIG. 4 is a schematic structural view of an aeration cleaning mechanism in the sewage treatment aeration biological filter tank of the present utility model;
FIG. 5 is a schematic diagram II of an aeration cleaning mechanism in the sewage treatment aeration biological filter;
FIG. 6 is an enlarged schematic view of the portion B of FIG. 5;
FIG. 7 is an enlarged schematic view of the portion C of FIG. 5;
In the figure: 1. a filter tank; 2. a water inlet pipe; 3. a water outlet pipe; 4. a blow-down pipe; 5. a filter screen; 501. a vibrating rod; 6. a biological filter membrane; 7. a lifting mechanism; 701. a fixing frame; 702. a lifting frame; 703. a screw rod I; 704. a motor I; 8. an aeration cleaning mechanism; 801. an aeration plate; 8011. an air outlet; 8012. stirring fan blades; 802. a support plate; 803. a fixed box; 804. an electric push rod I; 805. a turnover plate; 8051. a guide groove; 806. a scraper; 807. a screw II; 808. a motor II; 809. an electric push rod II; 810. a torsion spring; 811. a rotating shaft; 812. a conduit; 9. a vibration mechanism; 901. a spring; 902. and a spring guide rod.
Detailed Description
In order to facilitate understanding of those skilled in the art, the technical scheme of the present utility model will be further specifically described below with reference to fig. 1 to 7.
A sewage treatment aeration biological filter tank comprises a filter tank 1, a water inlet pipe 2, a water outlet pipe 3, a sewage discharge pipe 4, a filter screen 5, a biological filter membrane 6, a lifting mechanism 7, an aeration cleaning mechanism 8 and a vibration mechanism 9; the filter screen 5 and the biological filter membrane 6 are arranged in the filter tank 1, and the biological filter membrane 6 is positioned above the filter screen 5; the water inlet pipe 2 is positioned on the side wall of the filter tank 1 below the filter screen 5, and the water outlet pipe 3 is positioned on the side wall of the filter tank 1 above the biological filter membrane 6; the lifting mechanism 7 is fixed on the outer side wall of the filter tank 1 and is connected with the biological filter membrane 6 and the filter screen 5; the aeration cleaning mechanism 8 is arranged in the filter tank 1 below the filter screen 5; the vibration mechanism 9 is connected between the filter screen 5 and the biological filter membrane 6; the sewage discharge pipe 4 is positioned at the bottom end of the filter tank 1; sewage enters the filter tank 1 through the water inlet pipe 2, is subjected to preliminary filtration by the filter screen 5 and filtration and purification by the biological filter membrane 6, and is discharged through the water outlet pipe 3; the filter screen 5 can filter some larger impurities in the sewage, so that the blocking condition of the biological filter membrane 6 is effectively reduced; the aeration cleaning mechanism 8 can convey oxygen into the filter tank 1, which is beneficial to the growth of microorganisms on the biological filter membrane 6, thereby enhancing the filtering effect of the biological filter membrane 6; when a large amount of sludge is deposited at the bottom of the filter tank 1, the aeration cleaning mechanism 8 can scrape the sludge at the bottom of the filter tank 1 and discharge the sludge through the blow-off pipe 4.
The aeration cleaning mechanism 8 comprises an aeration plate 801, a supporting plate 802, a fixing box 803, an electric push rod I804, a turnover plate 805, a scraping plate 806, a screw rod II 807, a motor II 808, an electric push rod II 809, a torsion spring 810, a rotating shaft 811 and a guide pipe 812; the screw II 807 is provided with a pair and is connected to the side wall of the filter tank 1 through a bearing; the motor II 808 is provided with a pair of motors which are fixed on the outer side wall of the filter tank 1, and the output shaft is connected with a corresponding screw rod II 807; the support plate 802 is provided with a pair of screws connected with the corresponding screw rod II 807; the two ends of the aeration plate 801 are connected to the supporting plate 802 through a fixed shaft, a plurality of uniformly arranged air outlets 8011 are formed in the aeration plate 801, stirring blades 8012 are arranged at the top of the aeration plate 801, and water flow impacts on the stirring blades 8012 to enable the stirring blades 8012 to rotate, so that bubbles entering the filter tank 1 can be dispersed, and oxygen diffusion is facilitated; the conduit 812 is a hose, one end of which is connected with the aeration plate 801, and the other end of which is connected with an external oxygen tank; the fixing box 803 is provided with a pair of fixing boxes which are fixed at one end of the supporting plate 802 and are positioned below the screw II 807; the electric push rod I804 is fixed inside the fixed box 803; the turnover plate 805 is rotatably connected to one end of the aeration plate 801 through a rotating shaft, and the turnover plate 805 is connected with the electric push rod I804; the end of the turnover plate 805 away from the connection with the aeration plate 801 is provided with a guide groove 8051; the rotating shaft 811 is connected in the guide groove 8051 of the turnover plate 805, one end of the scraping plate 806 is connected with the rotating shaft 811, the top end of the scraping plate 806 is an inclined plane extending towards the bottom end of the filter tank 1, and the bottom is always contacted with the bottom of the filter tank 1; the electric push rod II 809 is fixed in the guide groove 8051 of the turnover plate 805, and the output end is connected with the end part of the rotating shaft 811; one end of the torsion spring 810 is connected with the scraper 806, and the other end is connected with the rotating shaft 811, so that the bottom of the scraper 806 can be guaranteed to be attached to the filter tank 1; motor ii 808 provides power to drive screw ii 807 to rotate, and screw ii 807 drives support plate 802 to move through threads; the supporting plate 802 drives the aeration plate 801 to move along the screw rod II 807, so that oxygen sprayed by the aeration plate 801 can fully fill the whole filter tank 1 and can prevent oxygen from gathering, thereby affecting the growth of local microorganisms in the biological filter membrane 6 and causing incomplete sewage purification; the electric push rod I804 provides power to drive the turnover plate 805 to turn downwards by taking the rotating shaft as the center, the turnover plate 805 drives the scraping plate 806 to move downwards, and meanwhile, the electric push rod II 809 drives the scraping plate to move along the turnover plate 805, so that the bottom of the scraping plate 806 is in contact with the filter tank 1; then the scraper 806 is driven to move along the screw rod II 807 by the aeration plate 801, and the scraper 806 cleans the sludge at the bottom of the filter tank 1 to the position of the sewage drain pipe 4 for discharging; then the scraper 806 is retracted and returned to one end far away from the sewage drain pipe 4, and the bottom of the filter tank 1 is cleaned again; not only can the bottom of the filter tank be cleaned, but also the sludge which is not scraped clean can be prevented from being brought back when the scraping plate returns, so that the sludge is accumulated at one end of the filter tank far away from the sewage drain pipe.
The lifting mechanism 7 comprises a fixed frame 701, a lifting frame 702, a lead screw I703 and a motor I704; the fixing frame 701 is fixed on the outer side wall of the filter tank 1, two ends of the screw rod I703 are connected with two ends of the fixing frame 701 through bearings, the motor I704 is fixed at the top end of the fixing frame 701, and the output shaft is connected with the screw rod I703; one end of the lifting frame 702 is connected with the biological filter membrane 6, and the other end is connected with the screw rod I703 through threads; the motor I704 provides power and drives the rotation of lead screw I703, and lead screw I703 drives crane 702 along mount 701 removal, and crane 702 drives biological filter membrane 6 and filter screen 5 upward movement to conveniently dismantle biological filter membrane 6 and filter screen 5 and shift out the change.
The bottom of the filter screen 5 is provided with a vibrating rod 501, and the vibrating mechanism 9 comprises a spring 901 and a spring guide rod 902; the spring guide rod 902 passes through the biological filter membrane 6 to be fixedly connected with the lifting frame 702, and the filter screen 5 is movably connected on the spring guide rod 902; the spring guide rod 902 passes through the spring 901, and the spring 901 is arranged between the filter screen 5 and the biological filter membrane 6; when the supporting plate 802 moves along the screw rod II 807, the supporting plate 802 contacts with the vibrating rod 501 at the bottom of the filter screen 5, the filter screen 5 is driven to move upwards by the vibrating rod 501, and the spring 901 is compressed; when the supporting plate 802 is far away from the vibrating rod 501, the spring 901 is restored to drive the filter screen 5 to return to the original position, so that the filter screen 5 vibrates, and the filter screen 5 can be prevented from being blocked.
A sewage treatment biological aerated filter, the working process is as follows: sewage enters the filter tank 1 through the water inlet pipe 2, is subjected to preliminary filtration by the filter screen 5 and filtration and purification by the biological filter membrane 6, and is discharged through the water outlet pipe 3; the filter screen 5 can filter some larger impurities in the sewage, so that the blocking condition of the biological filter membrane 6 is effectively reduced; the aeration cleaning mechanism 8 can convey oxygen into the filter tank 1, which is beneficial to the growth of microorganisms on the biological filter membrane 6, thereby enhancing the filtering effect of the biological filter membrane 6; when a large amount of sludge is deposited at the bottom of the filter tank 1, the aeration cleaning mechanism 8 can scrape the sludge at the bottom of the filter tank 1 and discharge the sludge through the blow-off pipe 4.
The foregoing is merely illustrative and explanatory of the utility model, as it is well within the scope of the utility model as claimed, as it relates to various modifications, additions and substitutions for those skilled in the art, without departing from the inventive concept and without departing from the scope of the utility model as defined in the accompanying claims.

Claims (3)

1. A sewage treatment aeration biological filter comprises a filter, a water inlet pipe, a water outlet pipe, a sewage discharge pipe, a filter screen, a biological filter membrane, a lifting mechanism, an aeration cleaning mechanism and a vibration mechanism; the filter is characterized in that the filter screen and the biological filter membrane are arranged in the filter tank, and the biological filter membrane is positioned above the filter screen; the water inlet pipe is positioned on the side wall of the filter tank below the filter screen, and the water outlet pipe is positioned on the side wall of the filter tank above the biological filter membrane; the lifting mechanism is fixed on the outer side wall of the filter tank and is connected with the biological filter membrane and the filter screen; the aeration cleaning mechanism is arranged in the filter chamber below the filter screen; the vibration mechanism is connected with the filter screen and the biological filter membrane, and the sewage discharge pipe is positioned at the bottom end of the filter tank;
The aeration cleaning mechanism comprises an aeration plate, a supporting plate, a fixed box, an electric push rod I, a turnover plate, a scraping plate, a screw rod II, a motor II, an electric push rod II, a torsion spring, a rotating shaft and a guide pipe; the screw rod II is provided with a pair and is connected to the side wall of the filter tank through a bearing; the motor II is provided with a pair of screws which are fixed on the outer side wall of the filter tank, and the output shaft is connected with the corresponding screw rod II; the supporting plate is provided with a pair of screws which are connected with the corresponding screw rods II through threads; two ends of the aeration plate are connected to the supporting plate through a fixed shaft, a plurality of uniformly arranged air outlets are arranged on the aeration plate, and stirring blades are arranged at the bottom of the aeration plate; the conduit is a hose, one end of the conduit is connected with the aeration plate, and the other end of the conduit is connected with an external oxygen tank; the fixed box is provided with a pair of fixed at one end of the supporting plate and positioned below the screw rod II; the electric push rod I is fixed in the fixed box, and the overturning plate is rotationally connected to one end of the aeration plate through a rotating shaft; the end of the turnover plate, which is far away from the connection with the aeration plate, is provided with a guide groove; the overturning plate is connected with the electric push rod I; one end of the turnover plate, which is far away from the connection with the aeration plate, is provided with a guide groove, the guide groove is rotationally connected in the guide groove of the turnover plate, one end of the scraping plate is connected with the rotation shaft, the top end of the scraping plate is an inclined plane extending towards the bottom end of the filter tank (1), and the bottom of the scraping plate is always contacted with the bottom of the filter tank; the electric push rod II is fixed inside the guide groove of the turnover plate, the output end of the electric push rod II is connected with the end part of the rotating shaft, one end of the torsion spring is connected with the scraping plate, and the other end of the torsion spring is connected with the rotating shaft.
2. The sewage treatment biological aerated filter according to claim 1, wherein the lifting mechanism comprises a fixed frame, a lifting frame, a screw rod I and a motor I; the fixing frame is fixed on the outer side wall of the filter tank, two ends of the screw rod I are connected to two ends of the fixing frame through bearings, the motor I is fixed at the top end of the fixing frame, and the output shaft is connected with the screw rod I; one end of the lifting frame is connected with the filter screen, and the other end of the lifting frame is connected with the screw rod I through threads.
3. The sewage treatment biological aerated filter according to claim 1, wherein the bottom of the filter screen is provided with a vibrating rod, and the vibrating mechanism comprises a spring and a spring guide rod; the spring guide rod penetrates through the biological filter membrane and is fixedly connected with the lifting frame, and the filter screen is movably connected to the spring guide rod; the spring guide rod penetrates through the spring, and the spring is arranged between the filter screen and the biological filter membrane.
CN202322563280.4U 2023-09-21 2023-09-21 Sewage treatment biological aerated filter Active CN220845731U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322563280.4U CN220845731U (en) 2023-09-21 2023-09-21 Sewage treatment biological aerated filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322563280.4U CN220845731U (en) 2023-09-21 2023-09-21 Sewage treatment biological aerated filter

Publications (1)

Publication Number Publication Date
CN220845731U true CN220845731U (en) 2024-04-26

Family

ID=90770887

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322563280.4U Active CN220845731U (en) 2023-09-21 2023-09-21 Sewage treatment biological aerated filter

Country Status (1)

Country Link
CN (1) CN220845731U (en)

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