CN110668593A - Sewage pretreatment tank for pipe-making plant - Google Patents
Sewage pretreatment tank for pipe-making plant Download PDFInfo
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- CN110668593A CN110668593A CN201911074850.5A CN201911074850A CN110668593A CN 110668593 A CN110668593 A CN 110668593A CN 201911074850 A CN201911074850 A CN 201911074850A CN 110668593 A CN110668593 A CN 110668593A
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- groove
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- 239000010865 sewage Substances 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 230000008859 change Effects 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 241000196324 Embryophyta Species 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 241000227272 Agarista populifolia Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention discloses a sewage pretreatment tank of a pipe-making plant, belonging to the field of sewage treatment, and comprising a treatment tank and a filter screen device, wherein the treatment tank is provided with a sewage treatment layer; the filter screen device is matched and connected with the treatment tank, the filter screen device comprises two identical fixing piles, each fixing pile comprises a fixing seat and a supporting column, the fixing seats are fixed on the extension table, and the supporting columns are vertically fixed on the fixing seats; a speed reducing motor is arranged at the top of the supporting rod, a screw rod is vertically arranged in the supporting column, a sliding block is connected to the screw rod in a threaded manner, and a supporting arm is arranged on the sliding block; the filter screen device further comprises a filter screen groove, the bottom surface of the filter screen groove is a detachable filter screen layer, a water inlet is formed in one end of the filter screen groove, connecting plates are arranged on two sides of the outer side of the filter screen groove, and the connecting plates are connected with the supporting arms. The relative position of the filter screen groove in the vertical direction can be changed, so that the filter screen groove can adapt to the operation habit of operators, and the operators can clean, replace and maintain the filter screen conveniently.
Description
Technical Field
The invention belongs to the field of sewage treatment, and relates to a sewage pretreatment tank for a pipe-making plant.
Background
The steel pipe is mainly widely used for industrial conveying pipelines, mechanical structural parts and the like in petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and the like. In addition, since the steel sheet is light in weight when it is bent and has the same torsional strength, it is widely used for manufacturing machine parts and engineering structures. A large amount of sewage is generated in the production of steel pipes, which contains a large amount of physical impurities, and if the sewage is directly subjected to chemical treatment, the treatment efficiency is affected, so that the sewage generated in the production of steel pipes needs to be pretreated.
The filtration equipment of sewage pretreatment system in current steel pipe factory, the clearance need be changed after the filter screen is used for a long time, need unpack whole mechanical equipment apart usually, then make operating personnel change the clearance to the filter screen, waste time and manpower and materials.
Disclosure of Invention
The invention aims to: the utility model provides a sewage pretreatment pond of tubulation factory, the filter screen clearance of having solved current sewage pretreatment of steel pipe factory equipment need be with the problem that whole mechanical equipment dismouting goes on with the change.
The technical scheme adopted by the invention is as follows:
a sewage pretreatment pool of a pipe-making plant comprises a treatment pool and a filter screen device, wherein a circle of extension table is arranged around a pool opening of the treatment pool, a water outlet is formed in one end of the bottom of the treatment pool, and the treatment pool is provided with a sewage treatment layer; the filter screen device is matched and connected with the treatment tank, the filter screen device comprises two identical fixing piles, the two fixing piles are symmetrically arranged about the central axis of the treatment tank, each fixing pile comprises a fixing seat and a supporting column, the fixing seats are fixed on the extension table, and the supporting columns are vertically fixed on the fixing seats; the top of the support column is provided with a speed reducing motor, an accommodating cavity is formed in the support column, a screw rod is vertically arranged in the accommodating cavity, one end of the screw rod is fixed at the bottom of the accommodating cavity through a bearing, and the other end of the screw rod is connected with the driving end of the speed reducing motor; the screw rod is in threaded connection with a sliding block, and a supporting arm is arranged on the sliding block; the filter screen device further comprises a filter screen groove, the filter screen groove is a rectangular groove body, the bottom surface of the filter screen groove is a detachable filter screen layer, a water inlet is formed in one end of the filter screen groove, connecting plates are arranged on two sides of the outer side of the filter screen groove, and the connecting plates are connected with the supporting arms.
The filtration equipment of sewage pretreatment system in current steel pipe factory, the clearance need be changed after the filter screen is used for a long time, need unpack whole mechanical equipment apart usually, then make operating personnel change the clearance to the filter screen, waste time and manpower and materials. According to the sewage pretreatment tank for the pipe mill, after the speed reducing motor is started, the screw rod is driven to rotate, the sliding block is in threaded connection with the screw rod, so that the sliding block can move up and down along the screw rod, the support arm is arranged on the screw rod, the filter screen groove is provided with the connecting plate, the connecting plate and the support arm can be in key connection or are fixedly connected through a bolt, after the support arm is fixedly connected with the filter screen groove, the sliding block can move up and down and simultaneously drive the filter screen groove to move up and down, so that the filter screen groove can be adjusted to a proper height, and operators can clean and replace the filter screen groove conveniently. Simultaneously, the filter screen layer can be dismantled in the setting, not only can dismantle the filter screen and get off and wash, can also make operating personnel change not unidimensional according to the filtration demand of difference. The sewage leads to the water pipe and enters into the filter screen groove from the water inlet of filter screen groove, filters behind the filter screen groove bold impurity, and sewage gets into the below space of treatment pond and carries out further processing, can set up the active carbon layer in the treatment pond, carries out further filtration treatment to sewage, and the sewage after the processing flows out from the delivery port of treatment pond. Compare with current sewage pretreatment filtration equipment's fixed filter screen structure, the relative position of filter screen groove in vertical side can change to can adapt to operating personnel's operation custom, make things convenient for operating personnel to carry out the clean maintenance of changing to the filter screen.
Furthermore, a supporting arm is arranged on the sliding block, through holes are formed in the supporting arm and the connecting plate, connecting pieces are arranged in the through holes in a matched mode, and the supporting arm is fixedly connected with the connecting plate through the connecting pieces. The connecting piece can adopt the bolt, and bolt and nut cooperation fixed connection compare with the key-type connection, and the bolt is removable, easy maintenance for filter screen device's life prolongs greatly.
Furthermore, the slider is the cylinder tube-shape, and the radial both sides in slider outside are provided with a screens piece respectively, screens piece and support arm bolted connection. Set up two screens pieces in the slider outside, the slider both sides all are provided with the support arm, set up the stress balance that the support arm can guarantee the slider in radial both sides, avoid the unstability of slider and lead screw in the course of the work.
Furthermore, the filter screen layer and the horizontal plane form an included angle of 5-10 degrees, and the distance between the bottom surface and the horizontal plane is gradually reduced from one end where the water inlet is located to the other end opposite to the water inlet. The area of the inclined plane is larger than that of the horizontal plane under the condition of the same horizontal projection area. Under the condition that the position of the wall of the filter screen groove is fixed, the area of the filter screen is increased compared with the horizontal plane by adopting the inclined plane on the filter screen layer, and the filtering efficiency is improved; the distance between the bottom surface and the horizontal plane is gradually reduced, so that the sewage backflow can be avoided.
Further, the sewage treatment layer is an activated carbon layer. The activated carbon layer has a large number of micro-porous structures which can adsorb impurities in the sewage of a steel pipe plant, so that the sewage is further filtered.
Furthermore, the bottom of the treatment pool is an inclined plane, and one end close to the water outlet is the lowest part of the inclined plane. The bottom of the treatment tank is provided with the inclined plane, so that the filtered sewage can flow out from the water outlet quickly, and the pretreatment efficiency is improved.
Furthermore, handles are arranged at two ends of the fixing seat. When the operator installs the fixed filter screen device, the handle can play the role of holding and temporarily fixing.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the sewage pretreatment tank for the pipe mill, the height of the filter screen groove can be adjusted by arranging the filter screen groove, so that the filter screen groove can be adjusted to a proper height, and operators can clean and replace the filter screen groove conveniently.
2. According to the sewage pretreatment tank for the pipe mill, the detachable filter screen layer is arranged, so that the filter screen can be detached for cleaning, and an operator can replace the filter screen with different sizes according to different filtering requirements.
3. According to the sewage pretreatment tank for the pipe making plant, the filter screen layer with a certain included angle with the horizontal plane is arranged, and under the condition that the position of the wall of the filter screen groove is fixed, the area of the filter screen is increased compared with the horizontal plane by adopting the inclined plane on the filter screen layer, so that the filtering efficiency is improved, the distance between the bottom surface and the horizontal plane is gradually reduced, and the sewage backflow can be avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
FIG. 1 is a schematic view showing the overall construction of a sewage pretreatment tank for a pipe mill according to the present invention;
FIG. 2 is a schematic view of the structure of a treatment tank of the present invention;
fig. 3 is a schematic view of the screw structure of the present invention.
The labels in the figure are: 1-treatment pool, 101-extension table, 102-water outlet, 103-sewage treatment layer, 104-inclined plane, 2-fixed pile, 201-fixed seat, 202-support column, 203-speed reduction motor, 204-screw rod, 205-slide block, 206-support arm, 207-accommodating cavity, 208-clamping piece, 3-filter screen groove, 301-detachable filter screen layer, 302-water inlet, 303-connecting plate, 4-connecting piece and 5-handle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example one
The sewage pretreatment tank for the pipe-making plant provided by the preferred embodiment of the invention comprises a treatment tank 1 and a filter screen device, wherein a circle of extension table 101 is arranged around the tank opening of the treatment tank 1, a water outlet 102 is arranged at one end of the bottom of the treatment tank 1, and a sewage treatment layer 103 is arranged in the treatment tank 1; the filter screen device is matched and connected with the treatment pool 1 and comprises two same fixing piles 2, the two fixing piles 2 are symmetrically arranged about the central axis of the treatment pool 1, each fixing pile 2 comprises a fixing seat 201 and a supporting column 202, the fixing seat 201 is fixed on the extension table 101, and the supporting column 202 is vertically fixed on the fixing seat 201; the top of the supporting column 202 is provided with a speed reducing motor 203, an accommodating cavity 207 is arranged in the supporting column 202, a screw rod 204 is vertically arranged in the accommodating cavity 207, one end of the screw rod 204 is fixed at the bottom of the accommodating cavity 207 through a bearing, and the other end of the screw rod 204 is connected with the driving end of the speed reducing motor 203; the screw rod 204 is in threaded connection with a sliding block 205, and a supporting arm 206 is arranged on the sliding block 205; the filter screen device further comprises a filter screen groove 3, the filter screen groove 3 is a rectangular groove body, the bottom surface of the filter screen groove 3 is a detachable filter screen layer 301, a water inlet 302 is formed in one end of the filter screen groove 3, connecting plates 303 are arranged on two sides of the outer side of the filter screen groove 3, and the connecting plates 303 are connected with the supporting arms 206.
The speed reducing motor 203 adopts a toroidal worm reducer ball screw elevator, and the screw 204 and the slide block 205 adopt ball screws.
The filtration equipment of sewage pretreatment system in current steel pipe factory, the clearance need be changed after the filter screen is used for a long time, need unpack whole mechanical equipment apart usually, then make operating personnel change the clearance to the filter screen, waste time and manpower and materials. According to the sewage pretreatment tank for the pipe mill, after the speed reducing motor 203 is started, the screw rod 204 is driven to rotate, the sliding block 205 is in threaded connection with the screw rod 204, so that the sliding block 205 can move up and down along the screw rod 204, the supporting arm 206 is arranged on the screw rod 204, the connecting plate 303 is arranged on the filter screen groove 3, the connecting plate 303 and the supporting arm 206 can be in key connection or are fixedly connected through bolts, after the supporting arm 206 is fixedly connected with the filter screen groove 3, the sliding block 205 can move up and down while driving the filter screen groove 3 to move up and down, so that the filter screen groove 3 can be adjusted to a proper height, and operators can clean and replace the sewage pretreatment tank conveniently. Simultaneously, the filter screen layer can be dismantled in the setting, not only can dismantle the filter screen and get off and wash, can also make operating personnel change not unidimensional according to the filtration demand of difference.
When the sewage treatment device works, sewage enters the filter screen groove 3 from the water inlet 302 of the filter screen groove 3 through the water pipe, after large impurities are filtered by the filter screen groove 3, the sewage enters the lower space of the treatment tank 1 for further treatment, an activated carbon layer can be arranged in the treatment tank 1 for further filtration treatment of the sewage, and the treated sewage flows out from the water outlet 102 of the treatment tank 1.
Compare with current sewage pretreatment filtration equipment's fixed filter screen structure, filter screen groove 3 can change in vertical ascending relative position to can adapt to operating personnel's operation custom, make things convenient for operating personnel to clean the change maintenance to the filter screen.
Example two
In this embodiment, on the basis of the first embodiment, the slider 205 is provided with the supporting arm 206, the supporting arm 206 and the connecting plate 303 are both provided with through holes, the through holes are provided with the connecting pieces 4 in a matching manner, and the supporting arm 206 and the connecting plate 303 are fixedly connected through the connecting pieces 4.
The connecting piece 4 can adopt a bolt, the bolt is matched and fixedly connected with the nut, and compared with key connection, the bolt is replaceable and easy to maintain, so that the service life of the filter screen device is greatly prolonged.
EXAMPLE III
In this embodiment, on the basis of the first embodiment, the sliding block 205 is cylindrical, two radial sides of the outer side of the sliding block 205 are respectively provided with a locking member 208, and the locking members 208 are connected with the supporting arm 206 by bolts.
Two clamping parts 208 are arranged on the outer side of the sliding block 205, the supporting arms 206 are arranged on two sides of the sliding block 205, the supporting arms 208 are arranged on two radial sides, stress balance of the sliding block 205 can be guaranteed, and instability of the sliding block 205 and the screw rod 204 in the working process is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents and improvements made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a system tub factory sewage preliminary treatment pond which characterized in that: the device comprises a treatment tank (1) and a filter screen device, wherein a circle of extension table (101) is arranged around the mouth of the treatment tank (1), a water outlet (102) is arranged at one end of the bottom of the treatment tank (1), and a sewage treatment layer (103) is arranged in the treatment tank (1); the filter screen device is matched and connected with the treatment pool (1), the filter screen device comprises two same fixing piles (2), the two fixing piles (2) are symmetrically arranged about the central axis of the treatment pool (1), each fixing pile (2) comprises a fixing seat (201) and a supporting column (202), the fixing seat (201) is fixed on the extension table (101), and the supporting column (202) is vertically fixed on the fixing seat (201); the top of the supporting column (202) is provided with a speed reducing motor (203), an accommodating cavity (207) is arranged in the supporting column (202), a screw rod (204) is vertically arranged in the accommodating cavity (207), one end of the screw rod (204) is fixed at the bottom of the accommodating cavity (207) through a bearing, and the other end of the screw rod (204) is connected with the driving end of the speed reducing motor (203); a sliding block (205) is connected to the screw rod (204) in a threaded manner, and a supporting arm (206) is arranged on the sliding block (205); the filter screen device further comprises a filter screen groove (3), the filter screen groove (3) is a rectangular groove body, the bottom surface of the filter screen groove (3) is a detachable filter screen layer (301), one end of the filter screen groove (3) is provided with a water inlet (302), two sides of the outer side of the filter screen groove (3) are provided with connecting plates (303), and the connecting plates (303) are connected with the supporting arms (206).
2. The sewage pretreatment tank of a pipe mill according to claim 1, wherein: the slider (205) is provided with a supporting arm (206), the supporting arm (206) and the connecting plate (303) are provided with through holes, the through holes are internally provided with connecting pieces (4) in a matching manner, and the supporting arm (206) and the connecting plate (303) are fixedly connected through the connecting pieces (4).
3. The sewage pretreatment tank of a pipe mill according to claim 2, wherein: the slider (205) is the cylinder tube-shape, and the radial both sides in slider (205) outside are provided with a screens piece (208) respectively, screens piece (208) and support arm (206) bolted connection.
4. The sewage pretreatment tank of a pipe mill according to claim 1, wherein: the filter screen layer (301) and the horizontal plane form an included angle of 5-10 degrees, and the distance between the bottom surface and the horizontal plane is gradually reduced from one end where the water inlet (302) is located to the other end opposite to the water inlet (302).
5. The sewage pretreatment tank of a pipe mill according to claim 1, wherein: the sewage treatment layer (103) is an activated carbon layer.
6. The sewage pretreatment tank of a pipe mill according to claim 1, wherein: the bottom of the treatment pool (1) is an inclined plane (104), and one end close to the water outlet (102) is the lowest part of the inclined plane (104).
7. The sewage pretreatment tank of a pipe mill according to claim 1, wherein: handles (5) are arranged at two ends of the fixed seat (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074850.5A CN110668593A (en) | 2019-11-06 | 2019-11-06 | Sewage pretreatment tank for pipe-making plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074850.5A CN110668593A (en) | 2019-11-06 | 2019-11-06 | Sewage pretreatment tank for pipe-making plant |
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| Publication Number | Publication Date |
|---|---|
| CN110668593A true CN110668593A (en) | 2020-01-10 |
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ID=69086116
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911074850.5A Pending CN110668593A (en) | 2019-11-06 | 2019-11-06 | Sewage pretreatment tank for pipe-making plant |
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| Country | Link |
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| CN (1) | CN110668593A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111606412A (en) * | 2020-04-22 | 2020-09-01 | 无锡碧泓达环境科技有限公司 | Floating plate type biological membrane system for river channel treatment |
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| CN208814776U (en) * | 2018-09-03 | 2019-05-03 | 中顺洁柔（四川）纸业有限公司 | It is a kind of for cleaning the collection filter device of Wastewater from Bleaching in Paper Making technique |
| JP6589193B1 (en) * | 2018-04-08 | 2019-10-16 | 广州金碩水晶有限公司 | Sewage treatment equipment for removing dirt from lighting panels |
| CN210915579U (en) * | 2019-11-06 | 2020-07-03 | 四川龙立可不锈钢管业有限公司 | Sewage pretreatment tank for pipe-making plant |
-
2019
- 2019-11-06 CN CN201911074850.5A patent/CN110668593A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206027235U (en) * | 2016-08-11 | 2017-03-22 | 亚德辉（天津）科技有限公司 | Domestic sewage treatment device |
| CN207532874U (en) * | 2017-08-22 | 2018-06-26 | 安徽康源环保科技有限公司 | A kind of sewage filter device |
| CN207680168U (en) * | 2017-09-11 | 2018-08-03 | 杨姣 | A kind of sewage disposal grid pond |
| JP6589193B1 (en) * | 2018-04-08 | 2019-10-16 | 广州金碩水晶有限公司 | Sewage treatment equipment for removing dirt from lighting panels |
| CN208814776U (en) * | 2018-09-03 | 2019-05-03 | 中顺洁柔（四川）纸业有限公司 | It is a kind of for cleaning the collection filter device of Wastewater from Bleaching in Paper Making technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111606412A (en) * | 2020-04-22 | 2020-09-01 | 无锡碧泓达环境科技有限公司 | Floating plate type biological membrane system for river channel treatment |
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