CN110422934A - A kind of use in waste water treatment sedimentation basin - Google Patents
A kind of use in waste water treatment sedimentation basin Download PDFInfo
- Publication number
- CN110422934A CN110422934A CN201910617992.5A CN201910617992A CN110422934A CN 110422934 A CN110422934 A CN 110422934A CN 201910617992 A CN201910617992 A CN 201910617992A CN 110422934 A CN110422934 A CN 110422934A
- Authority
- CN
- China
- Prior art keywords
- sedimentation basin
- fixedly mounted
- wall
- waste water
- ontology
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004062 sedimentation Methods 0.000 title claims abstract description 83
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 33
- 239000010802 sludge Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000007790 scraping Methods 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 11
- 239000002351 wastewater Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C02F1/001—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
Landscapes
- 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
It is disclosed by the invention to belong to sewage treatment equipment technical field, specially a kind of use in waste water treatment sedimentation basin, including sedimentation basin ontology, water inlet, mud-scraping apparatus, filter device, fixed column is fixedly mounted among the sedimentation basin ontology, the water inlet is fixedly mounted among the fixed column, the mud-scraping apparatus is fixedly mounted in sedimentation basin inner body wall bottom, the filter device is fixedly mounted in sedimentation basin inner body wall both ends, design is scientific and reasonable for structure of the invention, cleaning shoe inclination is placed on sedimentation basin body bottom portion, when cleaning shoe is moved, the sludge of circumference is first removed, the sludge of removing, which is affected by gravity, flows into sedimentation basin body bottom portion, the inside sludge of cleaning shoe removing is not contacted simultaneously, present apparatus structure is simple, it improves work efficiency.
Description
Technical field
The present invention relates to sewage treatment equipment technical field, specially a kind of use in waste water treatment sedimentation basin.
Background technique
Waste water is regarded as a kind of harmful thing, need by it is most cheap, do not influence environment as far as possible in a manner of dispose,
It means that site disposal system can be used, such as the waste water that dining room generates, rivers and lakes are directly discharged to, past one
In a century, it has been recognized that these methods can have an adverse effect to environment, it is varied that this develops people
Processing technique, the processing of waste water needs by sedimentation basin, and existing sedimentation basin is all bottom to be set as to inclined surface, but inclining
Sludge is existed simultaneously on inclined-plane not can be removed, and often occurs big impurity in the discharge of waste water and is easy obstruction mud discharging mouth, for this purpose,
We release a kind of use in waste water treatment sedimentation basin.
Summary of the invention
The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferable realities
Apply mode.It may do a little simplified or be omitted to avoid making in this section and the description of the application and the title of the invention
The purpose of this part, abstract of description and denomination of invention is fuzzy, and this simplification or omission cannot be used for limiting model of the invention
It encloses.
The problem of in view of a kind of above-mentioned and/or existing use in waste water treatment sedimentation basin, propose the present invention.
Therefore, the purpose of the present invention is to provide a kind of use in waste water treatment sedimentation basin, it is able to solve set forth above existing
Sedimentation basin is all bottom to be set as to inclined surface, but exist simultaneously sludge on inclined surface and not can be removed, in the discharge of waste water
Often there is the problem of big impurity is easy obstruction mud discharging mouth.
In order to solve the above technical problems, according to an aspect of the present invention, the present invention provides the following technical scheme that
A kind of use in waste water treatment sedimentation basin comprising: sedimentation basin ontology, water inlet, mud-scraping apparatus, filter device, the precipitating
Fixed column is fixedly mounted among the ontology of pond, the water inlet, the sedimentation basin inner body wall is fixedly mounted among the fixed column
The mud-scraping apparatus is fixedly mounted in bottom, and the filter device is fixedly mounted in sedimentation basin inner body wall both ends.
As a kind of a kind of preferred embodiment of use in waste water treatment sedimentation basin of the present invention, in which: the sedimentation basin sheet
Sludge pipe is fixedly mounted in body bottom right end, fixed installation outlet pipe above the sedimentation basin ontology right wall, among the fixed column
Partition is fixedly mounted, end cap is fixedly mounted on the left of the sedimentation basin bodies top, sedimentation basin inner body wall bottom is inclination
Face.
As a kind of a kind of preferred embodiment of use in waste water treatment sedimentation basin of the present invention, in which: the water inlet top
Splash cap is fixedly mounted in portion.
As a kind of a kind of preferred embodiment of use in waste water treatment sedimentation basin of the present invention, in which: the mud-scraping apparatus
Servo motor one be fixedly mounted on the sedimentation basin bodies top, gear one is fixedly mounted in one output end of servo motor,
The engagement of gear one connects the gear two, and bearing one is fixedly mounted in two inner wall of gear, and one inner wall of bearing is fixed
It is mounted at the top of the fixed column, the two both ends bottom of gear is fixedly mounted at the top of connecting rod, and the connecting rod bottom is fixedly mounted
Two top of bearing, two inner wall of bearing are fixedly mounted below the fixed column, and mounting bracket below the connecting rod is described
Cleaning shoe is fixedly mounted in frame bottom.
As a kind of a kind of preferred embodiment of use in waste water treatment sedimentation basin of the present invention, in which: the cleaning shoe inclines
It is tiltedly placed on the sedimentation basin body bottom portion, thin plate, fixed peace above the cleaning shoe is fixedly mounted below the cleaning shoe
Fill hairbrush.
As a kind of a kind of preferred embodiment of use in waste water treatment sedimentation basin of the present invention, in which: the filter device
Servo motor two be fixedly mounted on sedimentation basin bodies top both ends, spiral shell is fixedly mounted in two output end of servo motor
Bar, the screw rod lower section are socketed filter plate, the screw rod top and bottom socket positioning plate one and positioning plate two, the positioning plate
One is fixedly mounted in the sedimentation basin inner body wall with the positioning plate two, the positioning plate one and two inner wall of positioning plate
Equipped with bearing.
Compared with prior art: this kind of use in waste water treatment sedimentation basin, sedimentation basin body bottom portion install mud-scraping apparatus, scrape mud dress
It sets by starting servo motor one, servo motor one passes through gear one, gear two, connecting rod for power transmission to bracket, then passes through
The cleaning shoe of frame bottom installation is purged the sludge of sedimentation basin inner body wall bottom, the installation filtering of sedimentation basin inner body wall
Device, filter device have lift action to filter plate by screw rod, facilitated by starting servo motor two, servo motor two
The cleaning of filter plate with check, filter plate to waste water have filtration, cleaning shoe inclination be placed on sedimentation basin body bottom portion, In
When cleaning shoe is moved, the sludge of circumference is first removed, and the sludge of removing, which is affected by gravity, flows into sedimentation basin body bottom portion,
The inside sludge of cleaning shoe removing is not contacted simultaneously, present apparatus structure is simple, improves work efficiency.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of embodiment of the present invention, below in conjunction with attached drawing and detailed embodiment
The present invention is described in detail, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, right
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
Other attached drawings.Wherein:
Fig. 1 is the structure chart of apparatus of the present invention；
Fig. 2 is cleaning shoe top view of the present invention.
In figure: 100 sedimentation basin ontologies, 110 sludge pipes, 120 outlet pipes, 130 fixed columns, 131 partitions, 140 end caps, 200
Water inlet, 210 splash caps, 300 mud-scraping apparatus, 310 servo motors one, 320 gears one, 330 gears two, 340 bearings one, 350
Connecting rod, 360 bearings two, 370 brackets, 380 cleaning shoes, 381 thin plates, 382 hairbrush, 400 filter devices, 410 servo motors two,
420 positioning plates one, 430 screw rods, 440 filter plates, 450 positioning plates two.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
Secondly, combination schematic diagram of the present invention is described in detail, when embodiment of the present invention is described in detail, for purposes of illustration only,
Indicate that the sectional view of device architecture can disobey general proportion and make partial enlargement, and the schematic diagram is example, herein not
The scope of protection of the invention should be limited.In addition, the three-dimensional space of length, width and depth should be included in actual fabrication.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to implementation of the invention
Mode is described in further detail.
The present invention provides a kind of use in waste water treatment sedimentation basin, has structure simple, the excellent of pool bottom sludge is effectively treated
Point, referring to Fig. 1, including sedimentation basin ontology 100, water inlet 200, mud-scraping apparatus 300, filter device 400；
Referring to Fig. 1, sludge pipe 110 is installed in 100 bottom of sedimentation basin ontology, sedimentation basin ontology 100 includes sludge pipe 110, water outlet
Pipe 120, fixed column 130, partition 131, end cap 140, specifically, column 130, sedimentation basin are welded and fixed among sedimentation basin ontology 100
100 bottom right end of ontology welds sludge pipe 110, welding outlet pipe 120 above 100 right wall of sedimentation basin ontology, among fixed column 130
Welding diaphragm 131,100 top left side of sedimentation basin ontology are threadedly coupled end cap 140, and 100 inner wall bottom of sedimentation basin ontology is inclination
Face, sludge pipe 110 can have discharge effect to the sludge inside sedimentation basin ontology 100 by the outer wall pump housing, and outlet pipe 120 is to heavy
Water inside shallow lake pond ontology 100 has discharge effect, and fixed column 130 has installation effect to water inlet 200, and end cap 140 is to heavy
Have inside shallow lake pond ontology 100 and checks effect.
Referring to Fig. 1, water inlet 200 is mounted in fixed column 130, and water inlet 200 includes splash cap 210, specifically
, 200 screw top of water inlet connects splash cap 210, and waste water is passed through in sedimentation basin ontology 100 by water inlet 200.
Fig. 1 and Fig. 2 are please referred to, mud-scraping apparatus 300 is mounted on sedimentation basin ontology 100, and mud-scraping apparatus 300 includes servo electricity
It is machine 1, gear 1, gear 2 330, bearing 1, connecting rod 350, bearing 2 360, bracket 370, cleaning shoe 380, thin
Plate 381, hairbrush 382 are watched specifically, the servo motor 1 of mud-scraping apparatus 300 is threaded in 100 top of sedimentation basin ontology
It takes one 310 output end of motor and gear 1 is fixedly mounted, gear 1 engages connection gear 2 330, and 2 330 inner wall of gear is solid
Dingan County fills bearing 1, and one 340 inner wall of bearing is fixedly mounted on 130 top of fixed column, and 2 330 both ends bottom thread of gear connects
350 top of connective pole, 350 bottom thread of connecting rod connect 2 360 top of bearing, and fixed column 130 is fixedly mounted in 2 360 inner wall of bearing
Lower section, 350 lower section welding support 370 of connecting rod, 370 bottom thread of bracket connect cleaning shoe 380, and one 310 pairs of servo motor are scraped mud
Plate 380 provides power effect, and gear 1, gear 2 330, connecting rod 350 have transmission effect, bearing one to cleaning shoe 380
340 have positioning action with 2 360 pairs of connecting rods 350 of bearing, and cleaning shoe 380 has the sludge of 100 inner wall bottom of sedimentation basin ontology
There is cleaning effect.
Referring to Fig. 1, filter device 400 is mounted on sedimentation basin ontology 100, filter device 400 includes servo motor two
410, positioning plate 1, screw rod 430, filter plate 440, positioning plate 2 450, specifically, the servo motor two of filter device 400
410 are threaded in 100 top both ends of sedimentation basin ontology, and screw rod 430, screw rod 430 is fixedly mounted in 2 410 output end of servo motor
Lower section is socketed filter plate 440, the top of screw rod 430 and bottom socket positioning plate 1 and positioning plate 2 450, positioning plate 1 with
Positioning plate 2 450 is fixedly mounted on 100 inner wall of sedimentation basin ontology, and 2 410 pairs of filter plates 440 of servo motor provide power and make
With screw rod 430 has transmission effect to filter plate 440, and there is positioning to make for positioning plate 1 and 2 450 pairs of screw rods 430 of positioning plate
With filter plate 440 has filtration to waste water.
Above-mentioned mud-scraping apparatus 300, filter device 400 are made of metal.
When specifically used, those skilled in the art by servo motor 1 and two external power supply of servo motor, by into
Waste water is passed through inside sedimentation basin ontology 100 by the mouth of a river 200, and waste water flows into 100 inner wall bottom of sedimentation basin ontology by filter plate 440
It is precipitated, starts servo motor 1, servo motor 1 is by gear 1, gear 2 330, connecting rod 350 by power
Be transferred to bracket 370, then the cleaning shoe 380 installed by 370 bottom of bracket to the sludge of 100 inner wall bottom of sedimentation basin ontology into
Row is removed, and servo motor 2 410 is started, and servo motor 2 410 is risen filter plate 440 by screw rod 430, opens end cap
140 pairs of 440 surfaces of filter plate are cleared up.
In order to make the present apparatus effectively clear up sludge, cleaning shoe 380 is subjected to inclination installation, specifically, cleaning shoe 380 inclines
It is tiltedly placed on 100 bottom of sedimentation basin ontology, thin plate 381 is threadedly coupled below cleaning shoe 380, square thread connects on cleaning shoe 380
Hairbrush 382 is connect, the relatively thin contact surface of thin plate 381 can efficiently separate sludge, and hairbrush 382 has 100 bottom of sedimentation basin ontology
There is cleaning effect, the inclination of cleaning shoe 380 is placed on 100 bottom of sedimentation basin ontology, when cleaning shoe 380 is moved, precipitating
The sludge of 100 lower circumference of pond ontology is first removed, and the sludge of removing, which is affected by gravity, flows into 100 bottom of sedimentation basin ontology,
The inside sludge of the removing of cleaning shoe 380 is not contacted simultaneously, cleaning shoe 380 has cleaning to the sludge of 100 bottom of sedimentation basin ontology
Effect.
Referring to Fig. 1, in order to prevent 200 waste discharge of water inlet when bang splash, splash cap is installed at the top of water inlet 200
210, specifically, 210 inner wall of splash cap is arc structure, and 210 outer wall of splash cap offers intensive through-hole, splash cap 210
Can prevent waste water bang splash.
Referring to Fig. 1, in order to prevent positioning plate 1 and positioning plate 2 450 can not standing screw 430, positioning
Plate 1 and 2 450 inner wall of positioning plate are equipped with bearing, specifically, positioning plate 1 and positioning plate 2 450 are by bearing to spiral shell
Bar 430 is attached, and has positioning action to screw rod 430.
Although hereinbefore invention has been described by reference to embodiment, model of the invention is not being departed from
In the case where enclosing, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as not depositing
Various features in structural conflict, presently disclosed embodiment can be combined with each other by any way and be made
With not carrying out the description of exhaustive to the case where these combinations in the present specification and length and economize on resources merely for the sake of omitting
The considerations of.Therefore, the invention is not limited to particular implementations disclosed herein, but including falling into the scope of the claims
Interior all technical solutions.
Claims (6)
1. a kind of use in waste water treatment sedimentation basin, which is characterized in that including sedimentation basin ontology (100), water inlet (200), scrape mud dress
(300), filter device (400) are set, fixed column (130) are fixedly mounted among the sedimentation basin ontology (100), the fixed column
(130) intermediate that the water inlet (200) is fixedly mounted, mud is scraped described in sedimentation basin ontology (100) the inner wall bottom fixed installation
The filter device (400) is fixedly mounted in device (300), sedimentation basin ontology (100) the inner wall both ends.
2. a kind of use in waste water treatment sedimentation basin according to claim 1, which is characterized in that the sedimentation basin ontology (100)
Sludge pipe (110) are fixedly mounted in bottom right end, outlet pipe (120) are fixedly mounted above sedimentation basin ontology (100) right wall, institute
It states and partition (131) is fixedly mounted among fixed column (130), end cap is fixedly mounted in sedimentation basin ontology (100) top left side
(140), sedimentation basin ontology (100) the inner wall bottom is inclined surface.
3. a kind of use in waste water treatment sedimentation basin according to claim 1, which is characterized in that at the top of the water inlet (200)
It is fixedly mounted splash cap (210).
4. a kind of use in waste water treatment sedimentation basin according to claim 1, which is characterized in that the mud-scraping apparatus (300)
Servo motor one (310) is fixedly mounted at the top of the sedimentation basin ontology (100), and servo motor one (310) output end is solid
Dingan County's cogged one (320), gear one (320) engagement connect the gear two (330), gear two (330) inner wall
It is fixedly mounted bearing one (340), bearing one (340) inner wall is fixedly mounted at the top of the fixed column (130), the gear
Two (330) both ends bottoms are fixedly mounted at the top of connecting rod (350), and bearing two (360) top is fixedly mounted in connecting rod (350) bottom
Portion, bearing two (360) inner wall are fixedly mounted below the fixed column (130), and branch is fixedly mounted below the connecting rod (350)
Cleaning shoe (380) are fixedly mounted in frame (370), bracket (370) bottom.
5. a kind of use in waste water treatment sedimentation basin according to claim 1, which is characterized in that cleaning shoe (380) inclination
It is placed on sedimentation basin ontology (100) bottom, thin plate (381) is fixedly mounted below the cleaning shoe (380), it is described to scrape mud
Hairbrush (382) are fixedly mounted above plate (380).
6. a kind of use in waste water treatment sedimentation basin according to claim 1, which is characterized in that the filter device (400)
Servo motor two (410) is fixedly mounted on both ends at the top of the sedimentation basin ontology (100), servo motor two (410) output
Screw rod (430) are fixedly mounted in end, are socketed filter plate (440) below the screw rod (430), above the screw rod (430) and bottom
It is socketed positioning plate one (420) and positioning plate two (450), the positioning plate one (420) and the positioning plate two (450) are fixedly mounted
On sedimentation basin ontology (100) inner wall, the positioning plate one (420) and positioning plate two (450) inner wall are equipped with bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910617992.5A CN110422934A (en) | 2019-07-10 | 2019-07-10 | A kind of use in waste water treatment sedimentation basin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910617992.5A CN110422934A (en) | 2019-07-10 | 2019-07-10 | A kind of use in waste water treatment sedimentation basin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110422934A true CN110422934A (en) | 2019-11-08 |
Family
ID=68410420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910617992.5A Pending CN110422934A (en) | 2019-07-10 | 2019-07-10 | A kind of use in waste water treatment sedimentation basin |
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| Country | Link |
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| CN (1) | CN110422934A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000019955U (en) * | 1999-04-23 | 2000-11-25 | 김지수 | An apparatus for removing the sludeg in a setting pond |
| CN203389378U (en) * | 2013-08-02 | 2014-01-15 | 大连玉源环境工程有限公司 | Efficient sludge-discharging radial-flow sedimentation basin |
| CN104722104A (en) * | 2013-12-18 | 2015-06-24 | 天津禹士邦水处理技术有限公司 | Precipitated sludge treatment system |
| CN206168010U (en) * | 2016-07-31 | 2017-05-17 | 郑州碧水环保科技有限公司 | Active sand filter |
| CN207581384U (en) * | 2017-10-17 | 2018-07-06 | 中铁二十五局集团第五工程有限公司 | A kind for the treatment of tank mud scum slag collection side removal device |
| CN208356195U (en) * | 2018-04-17 | 2019-01-11 | 江苏博世建设有限公司 | A kind of Industrial Wastewater Treatment desludging device |
| CN211445251U (en) * | 2019-07-10 | 2020-09-08 | 南京博约环境科技有限公司 | Sedimentation tank for wastewater treatment |
-
2019
- 2019-07-10 CN CN201910617992.5A patent/CN110422934A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000019955U (en) * | 1999-04-23 | 2000-11-25 | 김지수 | An apparatus for removing the sludeg in a setting pond |
| CN203389378U (en) * | 2013-08-02 | 2014-01-15 | 大连玉源环境工程有限公司 | Efficient sludge-discharging radial-flow sedimentation basin |
| CN104722104A (en) * | 2013-12-18 | 2015-06-24 | 天津禹士邦水处理技术有限公司 | Precipitated sludge treatment system |
| CN206168010U (en) * | 2016-07-31 | 2017-05-17 | 郑州碧水环保科技有限公司 | Active sand filter |
| CN207581384U (en) * | 2017-10-17 | 2018-07-06 | 中铁二十五局集团第五工程有限公司 | A kind for the treatment of tank mud scum slag collection side removal device |
| CN208356195U (en) * | 2018-04-17 | 2019-01-11 | 江苏博世建设有限公司 | A kind of Industrial Wastewater Treatment desludging device |
| CN211445251U (en) * | 2019-07-10 | 2020-09-08 | 南京博约环境科技有限公司 | Sedimentation tank for wastewater treatment |
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