CN211111397U - Improved high-density clarification tank suitable for mine water treatment - Google Patents
Improved high-density clarification tank suitable for mine water treatment Download PDFInfo
- Publication number
- CN211111397U CN211111397U CN201920777848.3U CN201920777848U CN211111397U CN 211111397 U CN211111397 U CN 211111397U CN 201920777848 U CN201920777848 U CN 201920777848U CN 211111397 U CN211111397 U CN 211111397U
- Authority
- CN
- China
- Prior art keywords
- tank
- water
- mud
- sludge
- communicated
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an improved high-density clarification tank suitable for mine water treatment, which comprises a clarification tank body, wherein the clarification tank body is sequentially provided with a water distribution channel, a coagulation tank, a reaction tank, a flocculation tank, an air floatation oil removal tank and a sedimentation tank which are communicated from a water inlet end to a water outlet end, a plurality of aeration pipes connected with an aerator are laid at the bottom end of the air floatation oil removal tank, a slag scraper driven by a motor is arranged at the top of the air floatation oil removal tank, and the lower part of the slag scraper is sequentially communicated with an oil collecting tank and an oil discharge pipe; the sedimentation tank is sequentially provided with a water outlet collecting channel, an inclined plate area, a mud scraper and a mud storage hopper from top to bottom, a plurality of mud position observation devices are arranged on the side wall of the sedimentation tank between the inclined plate area and the mud storage hopper, the mud scraper of the mud scraper is parallel to and attached to the tank wall at the bottom of the sedimentation tank, and the mud scraper is driven by a motor; the utility model has the advantages of compact structure, reasonable in design has greatly shortened the preliminary treatment flow, and the treatment effeciency is high, and the treatment effect is stable, has saved whole cost and area, strong adaptability.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, especially, relate to an improved generation high density clarification tank suitable for mine water treatment.
Background
The mine water is characterized by high coal slime content, high salinity, suspended oil and missible oil, the current commonly used process is a pre-settling regulating tank, a coagulant adding agent, an oil separation tank/an air flotation tank removing oil, a flocculant adding agent, a porous flocculation tank, an inclined plate sedimentation tank and a valveless filter tank/filter, the process is a classic process of the mine water and is used for many years, the water treatment process can be slightly adjusted according to the difference of the water quality of each coal mine, but the selection of the whole process framework and the core technology does not generate great innovation and change, and the current process is in urgent need of breakthrough and improvement from the use of each coal mine because the current process mainly has the following technical problems:
1. The coal slime can not be smoothly discharged: how to separate the coal slime water is the key of technology, the mine water suspended solid content is high, at present the pre-settling equalizing basin is generally adopted, the incoming water is pre-settled first, the mud discharging mode is the periodic mud discharging of gravity basically, or the mud discharging of driving suction dredge, no matter which kind of mode, the equal a large amount of bottom of deposit of coal slime, regularly need use stealthily dirty pump and artifical clear pond, therefore the cell body is generally used to design two, the clearance of coal slime is very time-consuming and artificial work, very influence daily production, and the production is overhauld and is carried out when avoiding the big amount of water gushing in the pit, this drawback brings a great deal of inconvenience for the colliery.
2. Poor oil removal effect: the oil removal of the oil separation tank is configured during the classic design of a coal mine, but the oil separation tank has small-particle-size missible oil aiming at the oil floating effect due to the underground operation characteristics, the oil separation tank can not be used, almost no effect exists, a plurality of coal mine oil separation tanks are not put into use due to poor effects or even almost no effect exists, or the system is technically improved, the oil separation tank is replaced by the air floating tank which is constructed independently, and the later-stage investment cost is high.
3. the existing sedimentation tank of a plurality of coal mine water systems has poor use effect, the sludge discharge of the inclined plate sedimentation tank is realized by opening a valve at regular time intervals to discharge sludge at the P L C, the current section is abnormal, when the coal slime fluctuation is large, the theoretical sludge discharge and the actual sludge discharge are different, the operation cannot be grasped in time, the water outlet is deteriorated, the chemical dosage is increased, even the accident that the inclined plate collapses the tank frequently occurs, and certain potential safety hazard exists.
In view of the above problems, technical improvements and innovations have to be made to the current problems, and the high-density sedimentation tank belongs to the most advanced technical family in the field of water treatment. The high-density sedimentation tank is the latest stage of the evolution and development of sedimentation technology, and belongs to the latest generation of the three-generation sedimentation tank in the water treatment technology. Therefore, at present, many projects begin to introduce the high-density pond into the field of mine water, and certain effects are achieved, but improvement and perfection are still needed, because the high-density pond is initially developed and used in the municipal field and not used in the mine water, and many details need to be improved.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model aims at providing an improved generation high density clarification tank suitable for mine water treatment, compact structure, reasonable in design has greatly shortened the preliminary treatment flow, and the treatment effeciency is high, and the treatment effect is stable, has saved whole cost and area, strong adaptability.
In order to achieve the purpose, the utility model provides an improved generation high density clarification tank suitable for pit water treatment, including the clarification tank body, the clarification tank body is equipped with the water distribution canal, coagulating basin, reaction tank, flocculation basin, air supporting deoiling pond and the sedimentation tank that are linked together in proper order from the water inlet end to the water outlet end, a plurality of aeration pipes that link to each other with the aeration machine have been laid to the bottom of air supporting deoiling pond and the top is equipped with scrapes the sediment machine through motor drive, scrape sediment machine lower part and be linked together with oil sump and oil drain pipe in proper order; the sedimentation tank is from last to being equipped with play water catchment canal, ramp district, mud scraper and storage mud fill down in proper order, is located be equipped with a plurality of mud position viewing device on the sedimentation tank lateral wall between ramp district and the storage mud fill, the mud scraper of mud scraper is parallel and laminating with sedimentation tank bottom pool wall, the mud scraper passes through motor drive.
Preferably, the water inlet pipe of the clarification tank body is communicated with the water inlet of a water distribution channel with a grid, the water outlet of the water distribution channel is communicated with the water inlet at the bottom end of a coagulation tank, the water outlet at the bottom end of the coagulation tank is communicated with the water inlet at the bottom end of a reaction tank, the water outlet at the bottom end of the reaction tank is communicated with the water inlet at the bottom end of a flocculation tank, the water outlet at the bottom end of the flocculation tank is communicated with the water inlet at the bottom end of an air floatation oil removal tank, the water outlet at the upper end of the air floatation oil removal tank is communicated with the water inlet of a sedimentation;
Preferably, the water outlet of the air floatation oil removal tank is positioned below the oil collecting tank;
Preferably, the top of the coagulation tank is provided with a coagulant feeding port and a stirring device with blades extending into the coagulation tank, and the stirring device is driven by a motor;
Preferably, a flocculating agent inlet is arranged at the top of the flocculation tank, a guide cylinder and a stirring device with blades extending into a hollow cavity of the guide cylinder are arranged in the flocculation tank, and the stirring device is driven by a motor;
Preferably, the sludge of the water distribution channel is connected into a coagulation tank through a sludge return pipe, the sludge of the reaction tank is connected into a flocculation tank through a sludge return pipe, one part of the sludge of the sedimentation tank is connected into the flocculation tank through a sludge return pipe, the other part of the sludge is discharged through a sludge discharge pipe, a sludge return pump is arranged on the sludge return pipe, and a sludge discharge pump is arranged on the sludge discharge pipe;
Preferably, the device also comprises a flushing device which is arranged above the sedimentation tank and used for flushing the inclined plate area, and the flushing device is a flushing pipe connected with a high-pressure water pump.
The utility model provides a pair of improved generation high density clarification tank suitable for mine water treatment has following beneficial effect:
1. With coagulating basin, flocculation basin, sedimentation tank and sludge concentration set in an organic whole, compact structure, reasonable in design when improving treatment effeciency and treatment effect, greatly degree has shortened the preliminary treatment flow, has saved whole cost and area.
2. The air flotation system is additionally arranged at the inlet end of the sedimentation tank, so that the oil removal function is realized, an oil separation tank/air flotation tank in the process flow can be omitted, and the other indirect advantage is that the sedimentation problem of a large amount of coal slime is avoided in the guide wall.
Drawings
Fig. 1 is a schematic structural view of an improved high-density clarification tank suitable for mine water treatment provided by the utility model.
FIG. 2 is a process flow diagram of the improved high-density clarification tank suitable for mine water treatment provided by the utility model.
In the figure:
1. The system comprises a grid 2, a water distribution channel 3, a coagulation tank 31, a stirring device 4, a reaction tank 5, a flocculation tank 51, a stirring device 6, an air floatation oil removal tank 61, an aeration pipe 62, a slag scraper 63, an oil collecting tank 64, an oil discharge pipe 7, a sedimentation tank 71, a mud scraper 711, a mud scraper inspection manhole 72, an inclined plate area 73, an effluent collection channel 74, a mud level observation device 75, a mud storage hopper 8, a water inlet pipe 9, a water outlet pipe 10, a mud return pipe 11, a mud discharge pipe 12 and a flushing pipe.
Detailed Description
The present invention will be further described with reference to the following specific embodiments and accompanying drawings to facilitate understanding of the present invention.
As shown in fig. 1-2, for the utility model provides a pair of improved generation high density clarification tank suitable for pit water treatment, including the clarification tank body, the clarification tank body is equipped with the water distribution canal 2 that is linked together in proper order from the end of intaking to the play water end, coagulation bath 3, reaction tank 4, flocculation basin 5, air supporting deoiling pond 6 and sedimentation tank 7, the inlet tube 8 of clarification tank body is linked together with coagulation bath 3 through the water distribution canal 2 that has grid 1, the delivery port of coagulation bath 3 bottom is linked together with the water inlet of reaction tank 4 bottom, the delivery port of reaction tank 4 bottom is linked together with the water inlet of flocculation tank 5 bottom, the delivery port of flocculation tank 5 bottom is linked together with the water inlet of air supporting deoiling pond 6 bottom, the delivery port of air supporting deoiling pond 6 upper end is linked together with the water inlet of sedimentation tank 7, sedimentation tank 7 is linked together through play water catch basin 73 and outlet pipe 9. The design of the end of intaking of depositing reservoir body has and is used for collecting and the grid 1 and the water distribution canal 2 of consuming energy, because the water that comes is that pressure conduit inserts and will consume energy earlier hand and collect, grid 1 can intercept the foreign matter of water, prevents that the foreign matter from twineing on parts such as agitating unit 31 and agitating unit 51 paddle leaf, the cavity of pump and mud scraper 71 scraper blade, carries out the protection of front end in to the system.
The top of the coagulation tank 3 is provided with a coagulant input port and a stirring device 31 with blades extending into the coagulation tank 3, and the stirring device 31 is driven by a motor. The coagulation basin 3 is used for generating turbidity in water and is natural particles with negative charges, and the particles are mutually repelled to form a high stable state. These particles are destabilized by the addition of the coagulant PAC (polyaluminium chloride). The kinetics of coagulation are very short. Rapid agitation by the agitation means 31 ensures rapid and complete dispersion of the coagulant.
The top of the flocculation tank 5 is provided with a flocculating agent inlet, a guide cylinder and a blade are arranged in the flocculation tank 5 and extend to the stirring device 51 in the hollow cavity of the guide cylinder, and the stirring device 51 is driven by a motor. The flocculating tank 5 is added with a flocculating agent PAM, flocculation and stirring are physical mechanical processes, and the growth of flocculating constituents is enhanced due to intermolecular acting force and physical stirring action. The addition of the anionic polymer electrolyte can improve the adsorption, the electrical neutralization and the bridging effect among particles to improve the generation of flocculating constituents. Thanks to the accelerated flocculation of the settling agent, the velocity gradient corresponds to 10 times of that of the traditional flocculation process under the same sedimentation performance. The high flocculation power effect caused by the increase of the collision probability among the particles can still achieve good effect under the conditions of limited stirring time and limited volume of the flocculation tank 5. The water in the tank is gently agitated to prevent the break-up of the alum flocs. In this stage, although the agitation intensity is lower than that of the former stage, it is sufficient to keep the alumen ustum in a suspended state. The outside of the stirring device 51 is provided with a guide cylinder, mud reflows and collides with the medicament to generate and accelerate the growth of alum blossom. The speed of rotation of the stirring device 51 should ensure adequate stirring of the polymer and good flocculation. If the rotating speed is too high, the alum blossom is dangerous to be smashed; too low there is a risk of sludge settling in the reaction zone.
A plurality of aeration pipes 61 connected with an aerator are laid at the bottom end of the air floatation oil removal tank 6, a slag scraper 62 driven by a motor is arranged at the top of the air floatation oil removal tank, and the lower part of the slag scraper 62 is sequentially communicated with an oil collecting tank 63 and an oil discharge pipe 64; the water outlet of the air floatation oil removal tank 6 is positioned below the oil collecting tank 63. The aeration pipe drills 10-15 mm in diameter every 20-30 cm to discharge gas-dissolving water, floating oil is upwards collected to the water surface along with the guide wall under the support of micro bubbles due to density difference, and a slag scraper is arranged at the top of the aeration pipe to collect the floating oil.
The sedimentation tank 7 is sequentially provided with an outlet water collecting channel 73, an inclined plate area 72, a mud scraper 71 and a mud storage hopper 75 from top to bottom, and the outlet water collecting channel 73 adopts a triangular weir water collecting channel to collect produced water to a produced water main channel; a plurality of sludge position observation devices 74 are arranged on the side wall of the sedimentation tank 7 between the inclined plate area 72 and the sludge storage hopper 75, and each sludge position observation device 74 comprises at least one sludge discharge valve which is vertically and uniformly distributed and is used for observing the sludge position in the tank; the mud scraper of mud scraper 71 is parallel and laminating with sedimentation tank 7 bottom pool wall, and mud scraper 71 passes through motor drive, and sedimentation tank 7 top is close to mud scraper 71 department and is equipped with the mud scraper manhole 711 that is used for the maintainer business turn over. Most of the alum blossom is precipitated, concentrated and separated in a sedimentation tank 7. After flocculation, the water enters the bottom of the sloping plate area 72 of the sedimentation tank 7 and then flows upward to the effluent collection channel 73. Particles and flocs settle on the plates in the inclined plate zone 72 and slide down due to gravity. The higher mirror flow rate and 60 degree tilt of the tube chute can create a continuous self-scraping process. There is no accumulation of floes on the sloping plate section 72. Due to the good coagulation, flocculation and optimized design of the upstream, the flocs from the maturation tank are dense and easy to precipitate. Most of flocs are precipitated in the sludge area and concentrated at the bottom of the tank before entering the inclined plate area 72, so that inclined pipes in the inclined plate area 72 are not easy to block (sludge in a traditional inclined pipe sedimentation tank is precipitated on the inclined pipes), frequent cleaning is not needed, and the service life of the filler can be prolonged by independently filling the appropriate inclined plate area 72 aiming at the characteristics of mine water. And the device also comprises a flushing device which is arranged above the sedimentation tank 7 and used for flushing the inclined plate area 73, wherein the flushing device is a flushing pipe 12 connected with a high-pressure water pump.
The mud of joining in marriage ditch 2 passes through mud back flow 10 and links into coagulating basin 3, and the mud of reaction tank 4 passes through mud back flow 10 and links into flocculation basin 5, and flocculation basin 5 is even gone into through mud back flow 10 to some of the mud of sedimentation tank 7, and another part discharges through mud delivery pipe 11, is equipped with the mud backwash pump on the mud back flow 10, is equipped with the mud delivery pump on the mud delivery pipe 11. The settled sludge in the sedimentation tank 7 is scraped to the sludge storage hopper 75 by the scraper of the sludge scraper 71 at the bottom of the tank, and the sludge is circulated and pumped from the sludge storage hopper 75 by the sludge reflux pump to flow back to the flocculation tank 5. The backward flow of mud has increased the suspended solid of sewage, forms the sludge blanket of a flocculating constituent to a certain extent, and backward flow mud granule can increase the settling velocity of flocculating constituent, and the flocculation adsorption of biological flocculating constituent can the great degree the clearance of improvement pollutant in the mud simultaneously, and intensive treatment effect can avoid excessively throwing the medicament simultaneously. The purpose of the sludge reflux is reasonable sludge percentage, namely accelerating the growth of alum flocs and increasing the density of alum flocs. The circulation rate is the ratio of the settling agent/sludge to the water intake, and this ratio can be varied by one to two circulation pumps provided for each settling tank 7 depending on the water intake (3% or 6% of the water intake). The increase in circulation allows good treatment of the high peak turbidity of the influent water. And (4) periodically and intermittently discharging according to the mud level.
The utility model discloses with coagulating basin, flocculation basin, sedimentation tank and sludge thickening set in an organic whole, compact structure, reasonable in design when improving treatment effeciency and treatment effect, greatly degree has shortened the preliminary treatment flow, has saved whole cost and area. And through having increased the air supporting system at the sedimentation tank entry end, realize the function of deoiling, can omit oil interceptor/air supporting pond among the process flow, another indirect benefit has avoided the problem of deposiing of a large amount of coal slime in the guide wall.
The present invention has been described in detail with reference to specific embodiments, and the description of the embodiments is only for the purpose of helping understanding the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. An improved high-density clarification tank suitable for mine water treatment is characterized by comprising a clarification tank body, wherein the clarification tank body is sequentially provided with a water distribution channel, a coagulation tank, a reaction tank, a flocculation tank, an air floatation oil removal tank and a sedimentation tank which are communicated from a water inlet end to a water outlet end, the bottom end of the air floatation oil removal tank is paved with a plurality of aeration pipes connected with an aerator, the top of the air floatation oil removal tank is provided with a slag scraper driven by a motor, and the lower part of the slag scraper is sequentially communicated with an oil collecting tank and an oil discharge pipe; the sedimentation tank is from last to being equipped with play water catchment canal, ramp district, mud scraper and storage mud fill down in proper order, is located be equipped with a plurality of mud position viewing device on the sedimentation tank lateral wall between ramp district and the storage mud fill, the mud scraper of mud scraper is parallel and laminating with sedimentation tank bottom pool wall, the mud scraper passes through motor drive.
2. The improved high-density clarification tank for mine water treatment according to claim 1, characterized in that the water inlet pipe of the clarification tank body is communicated with the water inlet of a water distribution channel with a grid, the water outlet of the water distribution channel is communicated with the water inlet at the bottom end of the coagulation tank, the water outlet at the bottom end of the coagulation tank is communicated with the water inlet at the bottom end of the reaction tank, the water outlet at the bottom end of the reaction tank is communicated with the water inlet at the bottom end of the flocculation tank, the water outlet at the bottom end of the flocculation tank is communicated with the water inlet at the bottom end of the air flotation oil removal tank, the water outlet at the upper end of the air flotation oil removal tank is communicated with the water inlet of the sedimentation tank, and the.
3. The improved high-density clarification tank for mine water treatment as claimed in claim 2, wherein the water outlet of the air floatation oil removal tank is positioned below the oil collecting tank.
4. The improved high-density clarification tank for mine water treatment according to claim 2, characterized in that the top of the coagulation tank is provided with a coagulant inlet and a stirring device with blades extending into the coagulation tank, and the stirring device is driven by a motor.
5. The improved high-density clarification tank for mine water treatment according to claim 2, characterized in that a flocculant inlet is arranged at the top of the flocculation tank, a guide cylinder and a stirring device with blades extending into a hollow cavity of the guide cylinder are arranged in the flocculation tank, and the stirring device is driven by a motor.
6. The improved high-density clarification tank suitable for mine water treatment according to claim 2, characterized in that the sludge of the distribution channel is connected into the coagulation tank through a sludge return pipe, the sludge of the reaction tank is connected into the flocculation tank through a sludge return pipe, one part of the sludge of the sedimentation tank is connected into the flocculation tank through a sludge return pipe, the other part of the sludge is discharged through a sludge discharge pipe, a sludge return pump is arranged on the sludge return pipe, and a sludge discharge pump is arranged on the sludge discharge pipe.
7. The improved high-density clarification tank for mine water treatment according to claim 1, characterized by further comprising a flushing device arranged above the sedimentation tank for flushing the inclined plate area, wherein the flushing device is a flushing pipe connected with a high-pressure water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920777848.3U CN211111397U (en) | 2019-05-28 | 2019-05-28 | Improved high-density clarification tank suitable for mine water treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920777848.3U CN211111397U (en) | 2019-05-28 | 2019-05-28 | Improved high-density clarification tank suitable for mine water treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211111397U true CN211111397U (en) | 2020-07-28 |
Family
ID=71717448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920777848.3U Expired - Fee Related CN211111397U (en) | 2019-05-28 | 2019-05-28 | Improved high-density clarification tank suitable for mine water treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211111397U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925022A (en) * | 2020-08-31 | 2020-11-13 | 南京中电环保水务有限公司 | Efficient sedimentation tank for underground mine |
| CN115092997A (en) * | 2022-06-14 | 2022-09-23 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
-
2019
- 2019-05-28 CN CN201920777848.3U patent/CN211111397U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111925022A (en) * | 2020-08-31 | 2020-11-13 | 南京中电环保水务有限公司 | Efficient sedimentation tank for underground mine |
| CN115092997A (en) * | 2022-06-14 | 2022-09-23 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
| CN115092997B (en) * | 2022-06-14 | 2023-03-24 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205774033U (en) | A kind of compound efficient depositing reservoir | |
| CN101423262B (en) | Air-floated water treating apparatus | |
| CN211111397U (en) | Improved high-density clarification tank suitable for mine water treatment | |
| CN116768342A (en) | Internal electric precipitation coupling magnetic coagulation separation odorless advanced treatment device and treatment process thereof | |
| CN101530681A (en) | Seawater clarifier turbulence construction and clarifier thereof | |
| CN207713466U (en) | A kind of electric flocculation high dense settling pond | |
| CN210885400U (en) | Flotation device for sewage treatment | |
| CN205391828U (en) | Integral type pipe chute deposits filtering ponds | |
| CN103030229B (en) | Oily wastewater treatment device and treatment method in steel industry | |
| CN109293079B (en) | Low-energy-consumption aeration circulation clarification tank | |
| CN216604162U (en) | Lime softening density sedimentation tank for reclaimed water station | |
| CN212504366U (en) | High turbid water treatment device and sewage treatment system | |
| CN212476431U (en) | Oil field hypersalinity sewage treatment plant | |
| CN210480920U (en) | Air floatation system with sludge backflow function | |
| CN209853875U (en) | Integrated water purifying device | |
| CN111792763A (en) | High turbid water treatment device and sewage treatment system | |
| CN211946549U (en) | Low-suspended matter oil-containing mine water treatment equipment for coal mine | |
| CN203890153U (en) | Complete set of water quality purification treatment all-in-one equipment | |
| KR101045878B1 (en) | High-efficiency hybrid sedimentation basin for processing water elevation | |
| CN201370981Y (en) | Seawater clarification pool with turbulent flow structure | |
| CN207243524U (en) | Horizontal tube oil partiting precipitation pool | |
| CN219752100U (en) | High-efficiency baffling coagulation air-floatation complete device | |
| CN220684804U (en) | Sewage treatment sedimentation tank | |
| CN209906578U (en) | Integrated cement merchant concrete tank body sewage treatment equipment | |
| CN212713060U (en) | Inclined tube sedimentation tank and high-phosphorus wastewater treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200728 Termination date: 20210528 |