CN216986444U - Integrated filter tank for water treatment - Google Patents
Integrated filter tank for water treatment Download PDFInfo
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- CN216986444U CN216986444U CN202220231463.9U CN202220231463U CN216986444U CN 216986444 U CN216986444 U CN 216986444U CN 202220231463 U CN202220231463 U CN 202220231463U CN 216986444 U CN216986444 U CN 216986444U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 230000007246 mechanism Effects 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 32
- 238000009826 distribution Methods 0.000 claims abstract description 27
- 239000010802 sludge Substances 0.000 claims abstract description 27
- 238000011001 backwashing Methods 0.000 claims abstract description 20
- 239000000969 carrier Substances 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000005273 aeration Methods 0.000 claims description 22
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 9
- 238000004062 sedimentation Methods 0.000 description 8
- 239000010865 sewage Substances 0.000 description 8
- 239000012528 membrane Substances 0.000 description 7
- 238000009287 sand filtration Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000005374 membrane filtration Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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Abstract
The utility model discloses an integrated filter for water treatment, and relates to the technical field of water treatment equipment. The center of the top of the filter body is connected with a water inlet pipe, the periphery of the top of the filter body is connected with a water outlet pipe, the interior of the filter body is divided into a sludge area and a filtering carrier area from bottom to top, and the sludge area and the filtering carrier area are separated by a first interception screen; a back washing mechanism is arranged at the bottom of the filter body, and a water distribution mechanism is arranged between the back washing mechanism and the filter carrier area; a drainage pipeline is arranged between the water inlet pipe and the water distribution mechanism, the drainage pipeline keeps the communication between the water inlet pipe and the drainage pipeline, a carrier filter bed is arranged in the filter carrier area, and filter carriers are filled in the carrier filter bed. The utility model has the integrated efficient filtering function, has the advantages of high solid-liquid separation efficiency, high process integration level, good water outlet effect, stable operation, low investment, land occupation saving and the like, and is suitable for popularization and use.
Description
Technical Field
The utility model relates to the technical field of water treatment equipment, in particular to an integrated filter for water treatment.
Background
With the rapid development of social economy, the industrialization and urbanization levels are continuously improved, and the problem of water pollution is more serious, so that the problems of water environment pollution and water quality eutrophication in China are more prominent, and the national discharge standard of pollutants from urban sewage treatment plants is met in order to meet the new requirements of water environment protection engineering (GB 18918-2002).
At present, effluent SS of a conventional secondary sedimentation tank, such as a vertical flow sedimentation tank and an inclined plate (pipe) sedimentation tank, is generally 20-40 mg/L and can not stably reach the discharge standard of first-grade B and above. Usually, the filter is combined with a filtering device to stably reach the discharge standard of level B and above.
Conventional filtration equipment for advanced treatment includes sand filtration, MBR membrane filtration, fiber rotary disc filtration, and the like. However, the sand filtration investment is low, the continuous operation can be realized, and the blockage is easy; a first-stage water pump is required to be added for lifting, so that the energy consumption is high and the operating cost is high; the fine grid is added in the front, so that the manufacturing cost is high; the filter material of the sand filter tank is quartz sand, hardening or loss is easy to occur due to reasons such as incomplete backwashing and the like, and the replacement time of the filter material is usually 3-8 years; if the shutdown time is long, when the sand extractor is started again, the sand extractor is difficult to well run in a short time; management is more complex, etc.; the quality of the MBR membrane filtered effluent is good, and the floor area is small. But the investment is high; the membrane is easy to form membrane pollution, the service life of the membrane component is short, the membrane component needs to be replaced regularly, and the membrane component needs to be replaced for 3-5 years generally; the energy consumption is high, and the operating cost is high; the pretreatment requirement is high, and a membrane grating needs to be additionally arranged; the operation, maintenance and cleaning are complex, and the maintenance is carried out by professional personnel; the fiber rotary disc filter tank has the advantages of low investment, no need of lifting sewage, small occupied area and simple management. But the disc has the defects of easy falling of the biological film, low treatment efficiency, high energy consumption and the like.
Therefore, the filtering equipment in the prior art still has the technical problems of high energy consumption, high maintenance cost, low treatment efficiency, high investment and the like, and needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides an integrated filter tank for water treatment, which has the advantages of low energy consumption, small occupied area, convenient management and high treatment efficiency.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an integrated filter for water treatment comprises a filter body, wherein the center of the top of the filter body is connected with a water inlet pipe, and the periphery of the top of the filter body is connected with a water outlet pipe;
the filter tank body is internally divided into a sludge area and a filtering carrier area from bottom to top, and the sludge area and the filtering carrier area are separated by a first interception screen;
a back washing mechanism is arranged at the bottom of the filter body, and a water distribution mechanism is arranged between the back washing mechanism and the filter carrier area;
a drainage pipeline is arranged between the water inlet pipe and the water distribution mechanism, the drainage pipeline keeps the communication between the water inlet pipe and the drainage pipeline, the top end of the drainage pipeline is connected with the water inlet pipe, and the bottom end of the drainage pipeline is connected to the water distribution mechanism after vertically penetrating through the filtering carrier region;
a carrier filter bed is arranged in the filter carrier area, and filter carriers are filled in the carrier filter bed; and a second interception screen is arranged at the top of the filtering carrier area and is connected with the water outlet pipe.
As a preferable scheme of the present invention, the water distribution mechanism includes perforated pipes, the water distribution holes disposed on the perforated pipes are vertically and downwardly staggered, and the diameter of each water distribution hole is 8 to 10 mm.
As another preferable scheme of the present invention, the perforated pipe and the drainage pipe are connected by a tee joint or a cross joint; the perforated pipe is made of a steel pipe or a UPVC pipe.
Preferably, the backwashing mechanism comprises an aeration pipeline, the aeration pipeline is provided with holes in a mode of being inclined at 45 degrees downwards or vertically downwards staggered, the hole diameter of each hole in the aeration pipeline is 4-8 mm, and air is supplied through an air supply system connected with the aeration pipeline.
Preferably, the air supply system is an air pump or a fan.
Preferably, the height of the carrier filter bed is 0.5-2.0 m, the specific gravity of the filter carrier is more than 1, the filter carrier is cylindrical, spherical, rectangular or cubic, and the material of the filter carrier is PE resin.
Preferably, the sludge area is provided with a sludge discharge pipe, and the height of the sludge area is 0.3-0.7 m.
Preferably, the first interception screen is a flat plate type support screen made of SS304 stainless steel or polymer composite material, and the diameter of the opening on the first interception screen is 4 mm.
Preferably, the second interception screen is a roller screen, the material of the second interception screen is SS304 stainless steel or polymer composite material, and the diameter of the opening on the second interception screen is 4 mm.
Preferably, the water inlet pipe is connected with the drainage pipeline through a tee joint, the water outlet pipe is provided with a valve, and the filter body is cylindrical or rectangular and is made of glass fiber reinforced plastic, carbon steel or stainless steel.
Compared with the prior art, the utility model has the following beneficial technical effects:
(1) compared with sand filtration, the method has the advantages that no pressure is used for water inlet, and lifting is not needed; the energy consumption is low, and the operating cost is low; the first interception screen and the second interception screen are arranged, so that the filter carrier is not lost; the specific gravity of the filter carrier is slightly heavier than 1, and the backwashing is thorough without hardening.
(2) Compared with MBR membrane filtration, the investment is low; the service life of the filter carrier is long, can reach 15 years and more, and the filter carrier does not need to be replaced regularly; the requirement on pretreatment is not high, and the effluent of the normal secondary sedimentation tank is only needed; the energy consumption is low, and the operating cost is low; the operation and maintenance are simple.
(3) Compared with a fiber rotary disc filter tank, the filter tank has the advantages of smaller floor area, investment saving of 60 percent, low energy consumption, low operating cost and the like.
In conclusion, the integrated filter tank for water treatment has an integrated efficient filtering function, has the advantages of high solid-liquid separation efficiency, high process integration level, good water outlet effect, stable operation, low investment, land occupation saving and the like, and is particularly suitable for filter equipment in dispersive and medium-and small-sized sewage treatment projects.
Drawings
The utility model is further described with reference to the accompanying drawings:
FIG. 1 is a front view of an integrated filter for water treatment according to the present invention;
FIG. 2 is a left side view of an integrated filter for water treatment according to the present invention;
FIG. 3 is a schematic plan view of an aeration line in the backwashing mechanism of the present invention;
FIG. 4 is a schematic plan view of perforated pipes in the water distribution mechanism of the present invention;
FIG. 5 is a schematic plan view of a first interception screen according to the present invention;
in the figure:
1. the filter comprises a water inlet pipe, 2, a water outlet pipe, 3, a filter carrier, 4, a first interception screen, 5, a sludge discharge pipe, 6, an aeration pipeline, 7, a water distribution mechanism, 8, a drainage pipeline, 9, a second interception screen, 10, a tee joint, 11, a reducing tee joint, 12, a cross joint, 13 and a filter body.
Detailed Description
The utility model provides an integrated filter for water treatment, and in order to make the advantages and technical scheme of the utility model clearer and clearer, the utility model is further explained by combining specific embodiments.
The tee joint mentioned in the utility model is a tee joint, and the four-way joint is a four-way joint.
Combine fig. 1 and fig. 2 to show, an integral type filtering pond for water treatment, it includes filtering pond body 13, inlet tube 1, outlet pipe 2, mud pipe 5, drainage tube 8, tee bend 10 and reducing tee bend 11, the center that inlet tube 1 is located the top of filtering pond body is through setting up the inlet tube at the center, can realize intaking from the center of filtering pond body, outlet pipe 2 is located the periphery at the top of filtering pond body, the periphery that realizes filtering pond body top through outlet pipe 2 goes out water, for the convenience of control, preferably set up outlet valve on outlet pipe 2, also can set up inlet valve on the inlet tube. The shape of the filter body can be cylindrical or rectangular, and the filter body is reasonably selected according to actual application and is made of glass fiber reinforced plastic, carbon steel or stainless steel.
The filter tank body is divided into a sludge area and a filtering carrier area from bottom to top, the sludge area is 0.3-0.7 m, a sludge discharge pipe 5 is arranged in the sludge area, when the sludge height is higher than the sludge height, the sludge discharge pipe is opened to discharge the sludge, and the sludge area and the filtering carrier area are separated by a first interception screen 4; as shown in fig. 5, it is preferable that the first intercepting screen is a flat plate type supporting screen made of SS304 stainless steel or polymer composite material, and the diameter of the opening on the first intercepting screen is 4 mm.
As shown in fig. 3, a back-washing mechanism is arranged at the bottom of the filter body, a water distribution mechanism is arranged between the back-washing mechanism and the filter carrier area, and the back-washing mechanism performs back-washing by adopting a gas back-washing mode;
a drainage pipeline is arranged between the water inlet pipe and the water distribution mechanism, the drainage pipeline keeps the communication between the water inlet pipe and the drainage pipeline, the top end of the drainage pipeline is connected with the water inlet pipe, and the bottom end of the drainage pipeline is connected to the water distribution mechanism after vertically penetrating through the filtering carrier area; the drainage pipeline is connected with the water inlet pipe through a tee joint, and the purpose of the tee joint is to avoid the phenomenon that the pipeline is broken due to the existence of gas.
The filter carrier area is provided with a carrier filter bed, the carrier filter bed is filled with a filter carrier 3, the height of the carrier filter bed is 0.5-2.0 m, the specific gravity of the filter carrier is greater than 1, the filter carrier is cylindrical, spherical, rectangular or cubic, and the filter carrier is made of PE resin. A second interception screen 9 is arranged at the top of the filtering carrier area and is connected with the water outlet pipe, preferably, the second interception screen is a roller screen made of SS304 stainless steel or polymer composite material, and the diameter of an opening on the second interception screen is 4 mm; the primary purpose of the second intercepting screen is to prevent carriers in the carrier filter bed from rushing out.
As shown in fig. 4, the water distribution mechanism includes perforated pipes, the water distribution holes disposed on the perforated pipes are vertically and downwardly staggered, and the diameter of each water distribution hole is 8-10 mm.
The perforated pipe is connected with the drainage pipeline through a tee joint or a cross joint; the perforated pipe is made of a steel pipe or a UPVC pipe.
The backwashing mechanism comprises an aeration pipeline, the aeration pipeline is provided with holes in a mode of being inclined at 45 degrees downwards or vertically downwards staggered, the hole diameter of each hole in the aeration pipeline is 4-8 mm, and air is supplied to the aeration pipeline through an air pump or a fan connected with the aeration pipeline.
The method of using the integrated filter will be described in detail below.
The method specifically comprises the following steps:
sewage gets into drainage tube 8 from inlet tube 1, and drainage tube 8 passes through cross 12, reducing tee bend 11 gets into water distribution mechanism 7, and sewage passes through the even entering filtration carrier district of water distribution mechanism 7, and most mud floc is detained in row mud district, and the little mud floc of minute quantity can upwards get into and filter the carrier district, through the back of the processing of holding back of filtering the carrier, and the supernatant gets into second interception screen cloth 9 and through outlet pipe 2 discharge filter body. In this process, the aeration line 6 is closed.
The backwash flow is as follows:
the water continuously enters the filter body, the water outlet pipe 2 is closed, the aeration pipeline 6 is opened, and the gas backwashing process is carried out; controlling the amount of backwash air to make the filter carrier in a suspension rolling state in the filter carrier area; after the backwashing process is finished, the aeration pipeline 6 is closed, the water outlet pipe 2 is opened, and the backwashing liquid is discharged out of the filter body.
The sludge discharge process of the filter is as follows:
the sludge discharge pipe 5 is opened periodically to discharge the intercepted sludge flocs out of the filter tank system. In this process, the aeration line 6 is in a closed state.
The present invention is further illustrated by the following specific examples.
Example 1:
the novel integrated filter is applied to a secondary sedimentation tank of sewage integrated equipment in a certain community.
In the embodiment, the water treatment amount of the integrated filter tank is 60m3D, the filter body 13 is made of carbon steel, the shape of the filter is rectangular, and the section area of the filter carrier area is 1.35m2The actual surface load can reach 1.85m3/(m2·h)。
In this example, the water inlet pipe 1, the water outlet pipe 2, the sludge discharge pipe 5, the drainage pipeline 8, the water distribution mechanism 7 and the aeration pipeline 6 in the filter system are all made of UPVC pipes. The pipe diameters of a water inlet, a water outlet and a mud discharging port are DN40, the pipe diameters of a water inlet pipe 1, a drainage pipeline 8, a water outlet pipe 2 and a mud discharging pipe 5 are phi 50, the pipe diameter of a water distribution mechanism 7 is phi 40, and the pipe diameter of an aeration pipeline 6 is phi 20.
The height of the carrier bed in the filtering carrier area is 1.8m, and the height of the sludge layer is 0.5 m.
The specific gravity of the carrier filler in the filter carrier 3 is 1.005-1.05, the diameter of the carrier filler is 8mm, and the shape of the carrier filler is cylindrical.
The first interception screen 4 and the second interception screen 9 are made of polymer composite materials, and the diameter of each opening is 5 mm.
In the embodiment, the effluent SS of the secondary sedimentation tank of the integrated wastewater equipment in a certain district of the yellow island is 50-70 mg/L, after the integrated filter tank is used for treatment, the effluent SS is 8.5-9.6 mg/L, and the effluent SS can stably reach the first-class A standard.
In the example, the only electricity utilization equipment is a fan, the electricity utilization power is 0.18KW, the running time is 1h, and the power consumption per ton of water is 0.0024 KW.h.
The operation power consumption of this example and the sand filtration process, the MBR membrane filtration process, and the rotary disk filter process were compared as follows:
(1) sand filtering process
Need sand filtration intake pump: q is 2.5m3H, H is 25m, P is 0.55KW, and the running time is 22H; a sand filtration backwashing pump: q is 5m3H34 m, P1.1 KW, run time 2H. And accounting for the power consumption of the operation of each ton of water to be 0.191 KW.h.
(2) MBR membrane filtration process
Self-priming pump: q is 3m3H, 25m, 0.55KW and 21.6H of running time; a fan: 0.55KW, and the running time is 24 h; a medicine adding pump: 0.25KW, run time 1 h. And (4) accounting the power consumption of the operation of each ton of water to be 0.338 KW.h.
(3) Rotary disc filter tank process
The motor is driven by 0.55KW, and the running time is 24 h; the backwashing pump is 1.1KW, and the running time is 2 h. And accounting for the power consumption of the operation of each ton of water to be 0.205 KW.h.
As can be seen from the above, the novel integrated filter tank in the embodiment uses the least equipment, and only 1 fan; the power consumption is lowest in operation of each ton of water, and the energy conservation and consumption reduction are very obvious.
Example 2:
the integrated filter is used behind a secondary sedimentation tank of a sewage treatment station in another certain village and town.
The difference from the embodiment 2 is that: in the embodiment, the SS of the effluent of the secondary sedimentation tank of a certain town sewage treatment station is 20-40 mg/L, and after the treatment of the integrated filter tank, the SS of the effluent is 6.8-8.7 mg/L, and the SS of the effluent can stably reach the first-grade A standard.
The parts which are not described in the utility model can be realized by adopting or referring to the prior art.
Although terms such as inlet pipe 1, outlet pipe 2, filter carrier 3 etc. are used more often in this context, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.
Claims (9)
1. The utility model provides an integral type filtering pond for water treatment, its includes the filtering pond body, its characterized in that: the center of the top of the filter body is connected with a water inlet pipe, and the periphery of the top of the filter body is connected with a water outlet pipe;
the filter body is internally divided into a sludge area and a filtering carrier area from bottom to top, and the sludge area and the filtering carrier area are separated by a first interception screen;
a back-flushing mechanism is arranged at the bottom of the filter body, and a water distribution mechanism is arranged between the back-flushing mechanism and the filter carrier area;
a drainage pipeline is arranged between the water inlet pipe and the water distribution mechanism, the drainage pipeline keeps the communication between the water inlet pipe and the drainage pipeline, the top end of the drainage pipeline is connected with the water inlet pipe, and the bottom end of the drainage pipeline is connected to the water distribution mechanism after vertically penetrating through the filtering carrier region;
a carrier filter bed is arranged in the filter carrier area, and filter carriers are filled in the carrier filter bed; and a second interception screen is arranged at the top of the filtering carrier area and is connected with the water outlet pipe.
2. An integrated filter tank for water treatment as claimed in claim 1, wherein: the water distribution mechanism comprises perforated pipes, the perforated pipes are provided with water distribution holes, the water distribution holes are vertically and downwards staggered, and the diameter of each water distribution hole is 8-10 mm.
3. An integrated filter for water treatment according to claim 2, characterized in that: the perforated pipe is connected with the drainage pipeline through a tee joint or a cross joint; the perforated pipe is made of a steel pipe or a UPVC pipe.
4. An integrated filter tank for water treatment as claimed in claim 1, wherein: the back washing mechanism comprises an aeration pipeline, the aeration pipeline is provided with holes in a mode of being inclined at 45 degrees downwards or vertically downwards staggered, the hole diameter of each hole in the aeration pipeline is 4-8 mm, and air is supplied to the aeration pipeline through an air supply system connected with the aeration pipeline.
5. A filter chamber for water treatment as claimed in claim 4, wherein: the air supply system is an air pump or a fan.
6. An integrated filter for water treatment as claimed in claim 1, wherein: the height of the carrier filter bed is 0.5-2.0 m, the specific gravity of the filter carrier is greater than 1, the filter carrier is cylindrical, spherical, rectangular or cubic, and the material adopted by the filter carrier is PE resin.
7. An integrated filter tank for water treatment as claimed in claim 1, wherein: the sludge area is provided with a sludge discharge pipe, and the height of the sludge area is 0.3-0.7 m.
8. An integrated filter tank for water treatment as claimed in claim 1, wherein: the first interception screen is a flat plate type supporting screen made of SS304 stainless steel or polymer composite materials, and the diameter of an opening on the first interception screen is 4 mm.
9. An integrated filter for water treatment as claimed in claim 1, wherein: the second interception screen is a roller screen and is made of SS304 stainless steel or polymer composite materials, and the diameter of an opening on the second interception screen is 4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220231463.9U CN216986444U (en) | 2022-01-28 | 2022-01-28 | Integrated filter tank for water treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220231463.9U CN216986444U (en) | 2022-01-28 | 2022-01-28 | Integrated filter tank for water treatment |
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| Publication Number | Publication Date |
|---|---|
| CN216986444U true CN216986444U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220231463.9U Active CN216986444U (en) | 2022-01-28 | 2022-01-28 | Integrated filter tank for water treatment |
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| Country | Link |
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| CN (1) | CN216986444U (en) |
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- 2022-01-28 CN CN202220231463.9U patent/CN216986444U/en active Active
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Inventor after: Liu Shu Inventor after: Yang Yuxing Inventor after: Zheng Zhijia Inventor after: Xu Wenxian Inventor after: Guan Chuang Inventor after: Li Xinli Inventor after: Wang Haipeng Inventor after: Zhang Jingjing Inventor after: Li Fengda Inventor after: Yang Xiaomei Inventor after: Wang Dong Inventor after: Song Pingzhou Inventor before: Liu Shu Inventor before: Yang Yuxing Inventor before: Zheng Zhijia Inventor before: Xu Wenxian Inventor before: Zhang Jingjing Inventor before: Li Xinli Inventor before: Wang Haipeng Inventor before: Guan Chuang Inventor before: Li Fengda Inventor before: Yang Xiaomei Inventor before: Wang Dong Inventor before: Song Pingzhou |