CN109796074B - Filter brick for biological aerated filter and biological aerated filter using same - Google Patents
Filter brick for biological aerated filter and biological aerated filter using same Download PDFInfo
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- CN109796074B CN109796074B CN201910143432.0A CN201910143432A CN109796074B CN 109796074 B CN109796074 B CN 109796074B CN 201910143432 A CN201910143432 A CN 201910143432A CN 109796074 B CN109796074 B CN 109796074B
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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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Abstract
The invention provides a filter brick for a biological aerated filter, which comprises a first chamber extending from the bottom to the top of the filter brick, wherein the cross section area of the first chamber is gradually reduced from bottom to top; the lateral direction of the first chamber is provided with a pore plate with a plurality of openings, a partition plate is arranged between the middle position of the pore plate and the top wall of the filter brick, the pore plate is divided into an upper pore plate part and a lower pore plate part at the joint of the pore plate and the partition plate, and the top wall is divided into a first top wall part and a second top wall part at the joint of the top wall and the partition plate; the lower hole plate part, the side wall of the filter brick, the first top wall part and the partition plate form a second chamber, the first top wall part is provided with openings, and the first top wall part is adjacent to the side wall; the upper hole plate part, the second top wall part and the partition plate form a third chamber, an opening is formed in the second top wall part, and the partition plate separates the second chamber from the third chamber. The invention also provides a biological aerated filter adopting the filter brick.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a filter brick for a biological aerated filter and the biological aerated filter using the filter brick.
Background
A Biological Aerated Filter (BAF) is a novel Biological membrane method sewage treatment process developed in Europe and America at the end of 80 years, is greatly developed in the beginning of 90 years, has the maximum scale of dozens of thousands of tons per day, and can be developed into nitrogen and phosphorus removal.
The aeration biological filter tank in the prior art mainly adopts a water and gas distribution system of a whole-pouring filter plate and a filter head, the filter head is fixedly arranged on the whole filter plate, and backwashing air and backwashing water enter and are mixed together from the lower part of the filter head and then are discharged from a filter cap at the upper part of the filter head during backwashing. The following problems can occur in the construction and operation of the system: civil engineering and installation construction are complex, construction period is long, and construction precision is not easy to guarantee; a filtering chamber with the height of 1 meter needs to be arranged below the filtering plate and is used for installing an air distribution pipeline and daily maintenance, so that the filtering chamber occupies larger volume of the tank body but does not play a role in removing pollutants, and the filtering chamber belongs to volume waste. The filter is only provided with 36 water and gas distribution points per square meter, and the backwashing strength is uneven because of less water and gas distribution points. The filter head is easy to be damaged or blocked during operation, so that the backwashing strength is uneven, and the operation effect of the filter tank is influenced.
The filter brick structure in the prior art can only be used for a common filter pool or a deep bed filter pool for down-flow filtration, and only water passes through the filter bricks from top to bottom when the common filter pool or the deep bed filter pool is down-flow filtered. During backwashing, backwashing water and backwashing gas simultaneously pass through the filter bricks from bottom to top. Because the aeration biological filter tank needs continuous aeration during working, the existing filter bricks can not realize aeration well and can realize downward flowing water filtration.
Disclosure of Invention
In order to solve the above problems of the prior art, the present disclosure provides a filter brick for a biological aerated filter, the filter brick comprising a first chamber with an open bottom, the first chamber extending from the bottom of the filter brick to the top of the filter brick, the cross-sectional area of the first chamber gradually decreasing from bottom to top, the first chamber being used for accommodating an outlet end of a gas distribution and water distribution system; the lateral direction of the first chamber is provided with a pore plate with a plurality of openings, a separation plate is arranged between the middle position of the pore plate and a top wall of the filter brick, the pore plate is divided into an upper pore plate part and a lower pore plate part at the joint of the pore plate and the separation plate, and the top wall is divided into a first top wall part and a second top wall part at the joint of the top wall and the separation plate; the lower hole plate part, the side wall of the filter brick, the first top wall part and the partition plate form a second chamber, the first top wall part is provided with openings, and the first top wall part is adjacent to the side wall; the upper orifice plate part, the second top wall part and the separation plate form a third chamber, an opening is formed in the second top wall part, and the second chamber is separated from the third chamber by the separation plate.
Preferably, in one embodiment of the filter block according to the present disclosure, the top of the first chamber of the filter block may be a closed top plate. Preferably, the ceiling of the first chamber is lower than the first and second ceiling portions.
Preferably, in the filter block for a biological aerated filter according to the present disclosure, the filter block may have a rectangular parallelepiped configuration, the first chamber is located at a central position of a bottom of the filter block and extends longitudinally, the filter block is symmetrically provided with a left side partition plate and a right side partition plate at both sides of the first chamber, and the filter block is further symmetrically provided with a left side second chamber and a left side third chamber and a right side second chamber and a right side third chamber at both sides of the first chamber.
Further preferably, the left partition plate, the left upper perforated plate portion, the right upper perforated plate portion, and the right partition plate of the filter block have a substantially W-shaped configuration. Preferably, in the filter block according to the present disclosure, the width of the second top wall portion is greater than the width of the first top wall portion; preferably, the outer periphery of the top wall of the filter block is provided with a raised rib.
In another embodiment of a filter block for a biological aerated filter according to the present disclosure, the filter block may have a cylindrical configuration with a top surface and a bottom surface each having a hexagonal shape, the second and third chambers being configured to surround the first chamber; the width of the second top wall portion is greater than the width of the first top wall portion.
According to another aspect of the present disclosure, there is also provided a biological aerated filter, which employs the filter bricks described above; the biological filter comprises a plurality of rows of horizontally laid filter bricks and aeration pipes laid below the rows of filter bricks, wherein the aeration pipes are provided with short branch pipes which vertically face upwards.
Preferably, in the biological aerated filter according to the present disclosure, the aeration tube and the short branch tube are disposed at an intermediate position of the first chamber of the filter block.
Still preferably, in a specific embodiment of the biological aerated filter according to the disclosure, the upper part of the biological aerated filter is provided with a water inlet, the middle part is provided with a filter layer, and the bottom part is provided with a water outlet; when the biological aerated filter is aerated, oxygenated air is discharged upwards from the aeration pipe and the short branch pipe through the upper orifice plate part, the third chamber and the upper end surface of the filter brick; the sewage flows out downwards through the upper end surface of the filter brick, the second chamber and the lower orifice plate; when the biological aerated filter is used for backwashing, backwashing gas air is discharged upwards from the aeration pipe and the short branch pipe through the upper hole plate part, the third chamber and the upper end surface of the filter brick, and backwashing water is discharged upwards from bottom to top through the hole plate, the third chamber, the second chamber and the upper end surface of the filter brick.
According to the filter brick and the biological aerated filter of the invention, the beneficial effects at least comprise:
1. the filter brick can functionally distinguish the gap of the upper end surface of the filter brick from the internal space, and creatively enables the filter brick to be applied to a biological aerated filter.
2. The filter brick of the invention can simultaneously carry out upward aeration and downward water passing, and meets the requirements of the operating conditions of the biological aerated filter, so that the filter brick can be used for not only a common filter or a deep bed filter, but also the biological aerated filter, and the application range of the filter brick is expanded.
3. The filter brick is applied to a biological aerated filter, and can overcome the defects of a water and gas distribution system adopting a whole-pouring filter plate and a filter head in the prior art.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
Further objects, features and advantages of the present invention will become apparent from the following description of embodiments of the invention, with reference to the accompanying drawings, in which:
FIG. 1 schematically illustrates a vertical cross-sectional view of one embodiment of a filter block for a biological aerated filter according to the present disclosure;
FIG. 2 is a schematic view of a filter block according to the present disclosure having an aerator tube disposed within a first chamber thereof;
FIG. 3 is a schematic view of the operational principle of a filter block according to an embodiment of the present invention;
FIG. 4 is a schematic view of the working state of the filter brick of the present invention, FIG. 4a is a schematic view of the air-water state of the filter brick during filtration, and FIG. 4b is a schematic view of the air-water state of the filter brick during backwashing.
Detailed Description
The objects and functions of the present invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The nature of the description is merely to assist those skilled in the relevant art in a comprehensive understanding of the specific details of the invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.
As shown in fig. 1 to 2, a vertical cross-sectional view of one embodiment of a filter block for a biological aerated filter according to the present disclosure is schematically shown.
In the illustrated filter block for a biological aerated filter, a first chamber 53, which is open at the bottom, is included, extending from the bottom of the block to the top of the block. The cross-sectional area of the first chamber 53 is gradually reduced from bottom to top. As shown in fig. 2, the first chamber 53 is used for accommodating an outlet end of the distribution system; the first chamber is laterally provided with a perforated plate 20 having a plurality of openings, the filter bricks are provided with a partition plate 31 between a middle position of the perforated plate 20 and a ceiling wall, the perforated plate 20 is divided into an upper perforated plate portion 22 and a lower perforated plate portion 21 at a junction with the partition plate 31, and the ceiling wall is divided into a first ceiling wall portion 11 and a second ceiling wall portion 12 at a junction with the partition plate 31. Wherein the lower orifice plate portion 21, the side walls 41 of the filter bricks, the first top wall portion 11 and the partition plate 31 form a second chamber 51, the first top wall portion 11 being provided with an opening. The first top wall portion 11 is adjacent to the side wall 41. The upper orifice portion 22, the second top wall portion 12, and the partition plate 31 form a third chamber 52, the second top wall portion 12 is provided with an opening, and the partition plate 31 partitions the second chamber 51 from the third chamber 52. Wherein the first and second chambers are each for fluid flow therethrough.
Preferably, in one embodiment of the filter block according to the present disclosure, the top of the first chamber 53 of the filter block may be a closed top plate. Preferably, the ceiling of the first chamber 53 is lower than the first and second ceiling walls 11, 12.
Preferably, in the filter block for a biological aerated filter according to the present disclosure, the filter block may have a rectangular parallelepiped configuration, the first chamber 53 is located at the center of the bottom of the filter block and extends longitudinally, the left and right partition plates are symmetrically disposed at both sides of the first chamber 53, and the left and right second and third chambers are also symmetrically disposed at both sides of the first chamber.
Further preferably, the left partition plate, the left upper perforated plate portion, the right upper perforated plate portion, and the right partition plate of the filter block have a substantially W-shaped configuration. Preferably, in the filter block according to the present disclosure, the width of the second top wall portion 12 is greater than the width of the first top wall portion 11; preferably, the outer periphery of the top wall of the filter block is provided with a raised rib.
In the example shown in fig. 1, for example in a square or rectangular configuration of the block, the central portion of the top wall 10 of the block may be recessed downwardly to form a central recess 13, with the first chamber of the block in the middle and the lower portion being two orifice plates 20 which are inclined inwardly and form an open diverging trapezoidal channel configuration. The orifice plate 20 abuts the central depression 13 of the top wall 10.
In a preferred embodiment of the filter block according to the present disclosure, the filter block is of a square configuration or is in a rectangular parallelepiped configuration, shown in an end elevation view in fig. 1. As shown in the drawings, the block comprises left and right halves symmetrically arranged along its central axis, the interior of each of the left and right halves being divided into two separate chambers by a partition plate 31, the partition plate 31 extending from the top wall 10 of the block to the waist of the aperture plate 20 at a predetermined distance from the side wall (e.g. 41) adjacent to the block.
Two chambers in the left half part and the right half part can be a second chamber 51 and a third chamber 52 respectively, and a trapezoidal groove sandwiched between the left half part and the right half part is configured as a first chamber 53.
The second chamber 51 is the cavity between the first top wall 11 of the brick, the side wall 41 of the brick, the lower perforated plate 21 and the partition plate 31, i.e. the chamber inside the left and right halves and outside the partition plate 31 is the second chamber 51.
Wherein the cavity between the second top wall part 12 of the filter brick, the partition plate 31, the upper orifice plate part 22 and the central depression 13 of the upper end face is a third chamber 52, i.e. the chamber inside the left and right halves and inside the partition plate 31 is the third chamber 52.
As shown in fig. 1, the first top wall 11 and the second top wall 12 are arranged such that the first top wall 11 is an outer portion of the upper end face 10 of the filter block, and the second top wall 12 is an intermediate portion. The boundary position may be a connection position between the upper end surface 10 and the partition plate 31. Similarly, the boundary position between the lower orifice plate portion 21 and the upper orifice plate portion 22 is the connection position between the orifice plate 20 and the partition plate 31. The central depression 13 of the upper end face can serve to reinforce the strength of the connection with the orifice plate 20.
In this embodiment, the upper end face 10 of the filter block, the orifice plate 20, have openings 14, the partition plate 31 is not open, and the partition plate is made of a water-impermeable and gas-impermeable material. Preferably, the middle recess 13 of the upper end surface of the filter brick can be provided with a hole, and the side wall 41 and the side surface opposite to the side wall are not provided with holes, so that the air and water flow direction is ensured to flow in the up-down direction.
In the present embodiment, the filter block of the present invention adopts a technique of adding the partition plate 31 in the filter block without affecting the use effect, and functionally distinguishes the gap on the surface of the filter block from the internal cavity. When the device is operated, the air path and the water path are not affected each other. And during backwashing, air and water flow in the same direction, so that the air and water are discharged from gaps between the partition plates simultaneously without air resistance. The backwashing effect is not influenced.
In the above embodiment, the width of the second chamber 51 at the first top wall portion 11 is smaller than the width of the third chamber 52 at the upper end face middle section 12. That is, the area of the second chamber 51 occupying the upper end surface 10 is smaller than the area of the third chamber 52, that is, the width of the first top wall portion 11 is smaller than the width of the second top wall portion 12, which is favorable for sufficient aeration of the sewage. In other embodiments, the ratio of the second chamber 51 and the third chamber 52 to the upper end surface 10 can be adjusted according to practical applications and requirements, for example, the two chambers are equal or have the same size. Similarly, the position of the joint of the partition plate 31 on the orifice plate 20 can be adjusted according to the requirement.
In the embodiment shown in the figures, the block may be of generally rectangular parallelepiped configuration, the upper face 10 of the block may be provided on either side with raised ribs and the lower end of the block with horizontal feet.
The interior of the filter brick is like a letter W and can also be called as a W-shaped filter brick, and an internal mechanism is optimized and a partition plate is added on the basis of the original filter brick. The gap part and the inner cavity part on the upper surface of the filter brick are partitioned according to the functions of downward water passing and upward aeration. The filter brick has the technical characteristics of simultaneous upward aeration and downward water passing, and can be suitable for an aeration biological filter. The filter brick of the invention can be applied to an aeration biological filter, and can also be applied to a common filter and a deep bed filter.
The benefits of the filter block according to the present disclosure are further explained in connection with fig. 3 and 4.
In the biological aerated filter provided with the filter bricks according to the present disclosure, when the biological aerated filter is in normal operation, air enters the filter bricks through the air pipes, and then exits the filter bricks through the gap (the third chamber 52) between the two partition plates 31 to oxygenate the biological aerated filter. The water flowing downward flows downward through the filter bricks from the space (second chamber 51) outside the brick divider plate. Namely, the inner gap of the W-shaped filter brick is used for air passing, the gap at the outer side of the W-shaped filter brick is used for water passing, air and water run in a shunt way, air resistance is not generated, and mutual interference is avoided. During aeration, air is discharged from the middle gap (third chamber 52) from bottom to top at a proper air flow and pressure.
The fluid has a characteristic of selecting a path having the least resistance to flow. The middle gap (third chamber 52) is aerated from bottom to top, and if the water body also reversely flows from top to bottom from the middle gap (third chamber 52), the water body has great resistance, so the water body can select the side gap (second chamber 51) with small resistance to flow from top to bottom. During aeration, an air-water interface is formed in the first chamber 53 (fig. 3 shows only the air-water interface during backwashing), and since the gas is in the upper portion and the water is in the lower portion, the gas is discharged only through the upper air holes. Fig. 3 shows only the air-water interface at backwashing.
When the biological aerated filter applied to the filter brick is backwashed, gas is still discharged from a gap (a third chamber 52) between the heel separating plate 31, and water is discharged from all gaps (a second chamber 51 and the third chamber 52) on the surface of the filter brick, because gas and water are discharged from bottom to top during backwashing, the problem of gas resistance caused by reverse flow of gas and water is avoided.
Alternatively, in another embodiment of a filter block for a biological aerated filter according to the present disclosure, the block may have a cylindrical configuration with a top surface and a bottom surface each having a hexagonal shape, the second and third chambers being configured to surround the first chamber; the width of the second top wall portion is greater than the width of the first top wall portion.
According to another aspect of the present disclosure, there is also provided a biological aerated filter, which employs the filter bricks described above; the biological filter comprises a plurality of rows of horizontally laid filter bricks and aeration pipes laid below the rows of filter bricks, wherein the aeration pipes are provided with short branch pipes which vertically face upwards.
Preferably, in the biological aerated filter according to the present disclosure, the aeration tube and the short branch tube are disposed at an intermediate position of the first chamber of the filter block.
Still preferably, in a specific embodiment of the biological aerated filter according to the disclosure, the upper part of the biological aerated filter is provided with a water inlet, the middle part is provided with a filter layer, and the bottom part is provided with a water outlet; when the biological aerated filter is aerated, oxygenated air is discharged upwards from the aeration pipe and the short branch pipe through the upper orifice plate part, the third chamber and the upper end surface of the filter brick; the sewage flows out downwards through the upper end surface of the filter brick, the second chamber and the lower orifice plate; when the biological aerated filter is used for backwashing, backwashing gas air is discharged upwards from the aeration pipe and the short branch pipe through the upper hole plate part, the third chamber and the upper end surface of the filter brick, and backwashing water is discharged upwards from bottom to top through the hole plate, the third chamber, the second chamber and the upper end surface of the filter brick.
The aeration system in the biological aerated filter can also comprise an air pipe form adopting other modes and a matched air supply device. The filter bricks can also be distributed in rows or in a staggered way of multiple rows and multiple columns.
As shown in the schematic diagram of air-water state in FIG. 4a, when the biological aerated filter is aerated, the oxygenated air is discharged upwards from the aeration pipe and the short branch pipe through the upper orifice plate part, the third chamber and the upper end surface of the filter brick; and sewage flows downwards through the upper end surface of the filter brick, the second chamber and the lower orifice plate.
As shown in the schematic diagram of air-water state in FIG. 4b, during the backwashing of the biological aerated filter, the backwashing air is discharged upwards from the aeration pipe and the short branch pipe through the upper orifice plate part, the third chamber and the upper end surface of the filter brick, and the backwashing water is discharged upwards from bottom to top through the orifice plate, the third chamber, the second chamber and the upper end surface of the filter brick.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (9)
1. A filter brick for a biological aerated filter is characterized in that,
the filter brick comprises a first cavity with an open bottom, the first cavity extends from the bottom of the filter brick to the top of the filter brick, the cross section area of the first cavity is gradually reduced from bottom to top, and the first cavity is used for accommodating an outlet end of a gas and water distribution system;
the lateral direction of the first chamber is provided with a pore plate with a plurality of openings, a separation plate is arranged between the middle position of the pore plate and a top wall of the filter brick, the pore plate is divided into an upper pore plate part and a lower pore plate part at the joint of the pore plate and the separation plate, and the top wall is divided into a first top wall part and a second top wall part at the joint of the top wall and the separation plate;
the lower hole plate part, the side wall of the filter brick, the first top wall part and the partition plate form a second chamber, the first top wall part is provided with openings, and the first top wall part is adjacent to the side wall;
the upper orifice plate part, the second top wall part and the separation plate form a third chamber, the second top wall part is provided with an opening, and the separation plate separates the second chamber from the third chamber;
the filter brick is the cuboid configuration, first cavity is located filter brick bottom central point and longitudinal extension, the filter brick is in the bilateral symmetry of first cavity has left division board and the division board on right side, the filter brick is still the bilateral symmetry of first cavity has left second cavity and third cavity and the second cavity and the third cavity on right side.
2. A filter block for a biological aerated filter according to claim 1, wherein the top of the first chamber is a closed ceiling.
3. A filter block for a biological aerated filter according to claim 2, wherein the ceiling of the first chamber is lower than the first and second ceiling walls.
4. A filter block for a biological aerated filter according to claim 1, wherein the left partition plate, the left upper perforated plate portion, the right upper perforated plate portion and the right partition plate of the filter block have a substantially W-shaped configuration.
5. A filter block for a biological aerated filter according to claim 4, wherein the width of the second top wall portion is greater than the width of the first top wall portion; the outer periphery of the top wall of the filter brick is provided with a raised flange.
6. A filter block for a biological aerated filter according to claim 2 or 3, wherein the block is of a cylindrical configuration with hexagonal top and bottom faces, the second and third chambers being arranged to surround the first chamber; the width of the second top wall portion is greater than the width of the first top wall portion.
7. A biological aerated filter, characterized in that the biological aerated filter employs filter bricks as claimed in any one of claims 1 to 6; the biological filter comprises a plurality of rows of horizontally laid filter bricks and aeration pipes laid below the rows of filter bricks, wherein the aeration pipes are provided with short branch pipes which vertically face upwards.
8. A biological aerated filter according to claim 7 wherein the aeration tube and the short legs are disposed at an intermediate position in the first chamber of the filter block.
9. A biological aerated filter according to claim 8, wherein the biological aerated filter is provided with a water inlet at the upper part, a filter layer at the middle part and a water outlet at the bottom;
when the biological aerated filter is aerated, oxygenated air is discharged upwards from the aeration pipe and the short branch pipe through the upper orifice plate part, the third chamber and the upper end surface of the filter brick; the sewage flows out downwards through the upper end surface of the filter brick, the second chamber and the lower orifice plate;
when the biological aerated filter is used for backwashing, backwashing gas air is discharged upwards from the aeration pipe and the short branch pipe through the upper hole plate part, the third chamber and the upper end surface of the filter brick, and backwashing water is discharged upwards from bottom to top through the hole plate, the third chamber, the second chamber and the upper end surface of the filter brick.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910143432.0A CN109796074B (en) | 2019-02-26 | 2019-02-26 | Filter brick for biological aerated filter and biological aerated filter using same |
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| CN201910143432.0A CN109796074B (en) | 2019-02-26 | 2019-02-26 | Filter brick for biological aerated filter and biological aerated filter using same |
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| CN109796074B true CN109796074B (en) | 2021-11-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110124378B (en) * | 2019-06-17 | 2024-06-04 | 河南蔚蓝水处理技术有限公司 | 360-Degree filter brick |
| CN110950395B (en) * | 2019-11-27 | 2022-04-15 | 合肥三番水处理设备有限公司 | Filter brick for sewage treatment |
| CN112723527B (en) * | 2020-12-30 | 2021-11-19 | 江苏道科环境科技有限公司 | Universal square air-water distribution filter brick and water distribution system |
| CN114477457A (en) * | 2022-04-18 | 2022-05-13 | 北京涞澈科技发展有限公司 | Coupling sulfur autotrophic denitrification combined biological filter and sewage treatment method |
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| CN2436213Y (en) * | 2000-07-28 | 2001-06-27 | 台州中昌水处理设备有限公司 | Composite water and gas reversal flushing filter brick |
| CN102603087A (en) * | 2012-03-30 | 2012-07-25 | 西安建筑科技大学 | Water-pumping aeration device for improving water quality of deepwater type water reservoir |
| CN204193614U (en) * | 2014-08-04 | 2015-03-11 | 江苏川源环保设备有限公司 | A kind of plastic filter tiles structure |
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