CN211946583U - Circulating water drainage retrieval and utilization processing apparatus - Google Patents
Circulating water drainage retrieval and utilization processing apparatus Download PDFInfo
- Publication number
- CN211946583U CN211946583U CN202020329658.8U CN202020329658U CN211946583U CN 211946583 U CN211946583 U CN 211946583U CN 202020329658 U CN202020329658 U CN 202020329658U CN 211946583 U CN211946583 U CN 211946583U
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- medicament
- pipe
- water
- box
- tank
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000012545 processing Methods 0.000 title claims description 6
- 239000003814 drug Substances 0.000 claims abstract description 64
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 57
- 230000015556 catabolic process Effects 0.000 claims abstract description 17
- 238000006731 degradation reaction Methods 0.000 claims abstract description 17
- 238000004064 recycling Methods 0.000 claims abstract description 17
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 32
- 239000000126 substance Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 13
- 229940079593 drug Drugs 0.000 description 8
- 238000007599 discharging Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000000645 desinfectant Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000003911 water pollution Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
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Abstract
The utility model discloses a circulating water drainage recycling treatment device, which belongs to the technical field of water treatment and comprises a sedimentation tank, a water pipe, a degradation tank, a disinfection box and an ultrafiltration device, wherein the sedimentation tank is connected with the degradation tank through the water pipe, the disinfection box is connected with the ultrafiltration device through the water pipe, the top of the disinfection box is detachably connected with a top cover, the top of the top cover is provided with a medicament box, the bottom of the medicament box is fixedly connected with a medicament discharge pipe which runs through the top cover, when a limiting rod moves to a position which is contacted with a connecting rod, the connecting rod is pushed and drives a baffle to shift through a torsion spring, so that the medicament in the medicament box is discharged into the disinfection box through the medicament discharge pipe, when the limiting rod is far away from the connecting rod, the baffle automatically resets and blocks the medicament discharge pipe under the elastic action of the torsion spring, the medicament feeding is stopped, and the intermittent medicament feeding in, the manual medicine adding treatment is replaced, the manual operation is greatly reduced, and the time and the labor are saved.
Description
Technical Field
The utility model relates to a water treatment technical field especially relates to a circulating water drainage retrieval and utilization processing apparatus.
Background
The comprehensive control of water pollution attracts general attention of all countries in the world, the treatment technology of sewage is improved, the treatment efficiency is improved, the cost and the energy consumption are reduced, the important research content is remained, the most effective method for solving the water pollution is to comprehensively consider water resource planning, water body application and development of regional water pollution control, the recycling of circulating water drainage is also one of important ways for saving water resources and enterprise production energy consumption, and the application in production and life is continuously increased.
Patent number is CN 208648975U's publication a sewage treatment circulating water recycles device, through reforming transform prior art, has solved chlorine solution and water and has mixed inhomogeneous problem, and carries out intensive mixing to the lower extreme of mixing the liquid, conveniently mixes, and has complete operation flow, facilitates the use, easy operation.
When the circulating water recycling device is used, the following defects 1 exist, the circulating water recycling treatment process is a complete system project consisting of multiple systems, and the dynamic disinfection process belongs to the dynamic disinfection process of adding medicaments to disinfect circulating water, so that the medicaments need to be continuously added in the water body circulation disinfection process, a manual filling mode is usually adopted, time and labor are wasted, and the manual burden is increased; 2. the disinfection box is contacted with sewage for a long time, so that pollutants are easily adhered to the inner wall of the disinfection box, bacteria and other harmful substances are bred, the disinfection box is not easy to clean, the water body disinfection quality inside the disinfection box can be influenced by long-term accumulation, secondary pollution is caused, and therefore, a circulating water drainage recycling treatment device is provided.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circulating water drainage retrieval and utilization processing apparatus aims at continuous and automatic adding medicine to the disinfection incasement portion to the water to the circulation carries out disinfection treatment, and pollutant and bacterium etc. that can be convenient simultaneously are stained with the cover to the disinfection incasement wall clear up.
The utility model provides a specific technical scheme as follows:
the utility model provides a treatment device for recycling circulating water drainage, which comprises a sedimentation tank, a water pipe, a degradation tank, a disinfection box and an ultrafiltration device, wherein the sedimentation tank is connected with the degradation tank through the water pipe, the disinfection box is connected with the ultrafiltration device through the water pipe, the top part of the disinfection box is detachably connected with a top cover, the top part of the top cover is provided with a medicament box, the bottom part of the medicament box is fixedly connected with a medicament discharge pipe which penetrates through the top cover, one side of the bottom part of the top cover is provided with a torsion spring, the top cover is movably connected with a baffle and a connecting rod through the torsion spring, the baffle is positioned at the bottom part of the medicament discharge pipe, the top part of the top cover is provided with a motor, the power output end of the motor is detachably connected with a transmission shaft which extends to the inside of the disinfection box, the, the telescopic rod is inserted in the stirring rod, the side, away from the stirring rod, of the telescopic rod is provided with the brush plate, and one side of the surface of the stirring rod is provided with the adjusting bolt.
Optionally, one side of the surface of the disinfection box is fixedly connected with a water inlet pipe, the water discharging end of the degradation pool is connected with the water inlet pipe through a water conveying pipe, the bottom of the disinfection box is fixedly connected with a water discharging pipe, and the water discharging pipe is connected with the water inlet end of the ultrafiltration device through the water conveying pipe.
Optionally, one side of the top of the medicine box is fixedly connected with a medicine feeding pipe, and the medicine feeding pipe is close to one side of the medicine box and extends to the inside of the medicine box.
Optionally, a motor switch is installed on one side of the surface of the motor, and the current input end of the motor is electrically connected with an external power supply through the motor switch.
The utility model has the advantages as follows:
1. the inside of the chemical box is used for storing a disinfectant and conveying the disinfectant to the inside of the disinfection box through a drug discharge pipe penetrating through the top cover, a torsion spring is arranged at the bottom of the top cover and is movably connected with a baffle plate and a connecting rod through the torsion spring, the baffle plate blocks the drug discharge pipe to prevent the drug in the chemical box from being discharged, when the circulating water recycling treatment device runs, a motor is started, the motor runs to drive a stirring rod and a limiting rod to rotate through a transmission shaft, the limiting rod does circular motion along with the transmission shaft and is in discontinuous contact with the connecting rod, when the limiting rod moves to a position in contact with the connecting rod, the connecting rod is pushed and drives the baffle plate to shift through the torsion spring, so that the drug in the chemical box is discharged into the disinfection box through the drug discharge pipe, when the limiting rod is far away from the connecting rod, the baffle plate automatically resets to block the drug, the medicine adding is stopped, the intermittent medicine adding in the disinfection box is realized by the operation of the motor, the manual medicine adding treatment is replaced, the manual operation is greatly reduced, and the time and the labor are saved.
2. The stirring rod is of an internal hollow structure, one end of a telescopic rod is inserted into the stirring rod, the other end of the telescopic rod is provided with a brush plate, the stirring rod is connected with the telescopic rod through an adjusting bolt, when the inside of the disinfection box is normally disinfected, the telescopic rod is retracted into the stirring rod, the brush plate is far away from the inner wall of the disinfection box, the stirring rod is normally rotated along with a transmission shaft to stir water flowing through the inside of the disinfection box at the moment, the fusion of medicaments is accelerated, when the inner side wall of the disinfection box needs to be cleaned, only the adjusting bolt is required to be unscrewed, the telescopic rod is extended until the brush plate just contacts with the inner wall of the disinfection box, the adjusting bolt is screwed to fix the length of the telescopic rod, at the moment, a motor runs, the stirring rod rotates, the brush plate is driven to rotate by the telescopic rod, the brush plate contacts with the inner wall of the disinfection box and rotates continuously, and the cleaning quality is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the internal structure of a disinfection box of a circulating water drainage recycling treatment device according to an embodiment of the present invention;
fig. 2 is a schematic view of the overall structure of a circulating water drainage recycling treatment device according to an embodiment of the present invention;
fig. 3 is a schematic view of a top cover bottom structure of a circulating water drainage recycling treatment device according to an embodiment of the present invention;
fig. 4 is a schematic view of the structure of the joint between the stirring rod and the telescopic rod of the circulating water drainage recycling treatment device of the embodiment of the present invention.
In the figure: 1. a sedimentation tank; 101. a water delivery pipe; 2. a degradation tank; 3. a sterilizing box; 301. a water inlet pipe; 302. a drain pipe; 4. an ultrafiltration device; 5. a top cover; 6. a kit; 601. a medicine feeding pipe; 602. a medicine discharge pipe; 7. a torsion spring; 701. a baffle plate; 702. a connecting rod; 8. a motor; 801. a motor switch; 802. a drive shaft; 803. a limiting rod; 9. a stirring rod; 901. a telescopic rod; 902. brushing the board; 903. and adjusting the bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A circulating water discharge recycling treatment apparatus according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 4.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the present invention provides a recycling treatment apparatus for circulating water drainage, including a sedimentation tank 1, a water pipe 101, a degradation tank 2, a disinfection box 3 and an ultrafiltration device 4, wherein the sedimentation tank 1 is connected with the degradation tank 2 through the water pipe 101, the disinfection box 3 is connected with the ultrafiltration device 4 through the water pipe 101, the top of the disinfection box 3 is detachably connected with a top cover 5, the top of the top cover 5 is provided with a chemical box 6, the bottom of the chemical box 6 is fixedly connected with a drug discharge pipe 602 penetrating through the top cover 5, one side of the bottom of the top cover 5 is provided with a torsion spring 7, the top cover 5 is movably connected with a baffle 701 and a connecting rod 702 through the torsion spring 7, the baffle 701 is located at the bottom of the drug discharge pipe 602, the top of the top cover 5 is provided with a motor 8, the power output end of the, the top of the surface of the transmission shaft 802 is fixedly connected with a limiting rod 803, the surface of the transmission shaft 802 is fixedly connected with a plurality of stirring rods 9, the stirring rods 9 are inserted into telescopic rods 901, one side, far away from the stirring rods 9, of each telescopic rod 901 is provided with a brush plate 902, and one side, far away from the surface of each stirring rod 9, of each stirring rod 9 is provided with an adjusting bolt 903.
Illustratively, when the limiting rod 803 moves to the position contacting with the connecting rod 702, the connecting rod 702 is pushed and drives the baffle 701 to shift through the torsion spring 7, so that the medicament in the medicament box 6 is discharged into the disinfection box 3 through the medicament discharge pipe 602, when the limiting rod 803 is far away from the connecting rod 702, under the elastic force of the torsion spring 7, the baffle 701 automatically resets and blocks the medicament discharge pipe 602, the medicament feeding is stopped, the intermittent medicament feeding in the disinfection box 3 is realized by the operation of the motor 8, the manual medicament feeding treatment is greatly reduced, the time and labor are saved, the adjusting bolt 903 is unscrewed, the telescopic rod 901 is extended until the brush plate 902 just contacts with the inner wall of the disinfection box 3, the stirring rod 9 rotates and drives the brush plate 902 to rotate through the telescopic rod 901, the brush plate contacts with the inner wall of the disinfection box 3 and rotates constantly, the inner wall of the disinfection box 3 can be cleaned efficiently, and the convenience for cleaning the inner wall of the disinfection box 3, and the cleaning quality is better.
Referring to fig. 1 and 2, a water inlet pipe 301 is fixedly connected to one side of the surface of the disinfection box 3, a water discharge end of the degradation tank 2 is connected to the water inlet pipe 301 through a water pipe 101, a water discharge pipe 302 is fixedly connected to the bottom of the disinfection box 3, and the water discharge pipe 302 is connected to a water inlet end of the ultrafiltration device 4 through the water pipe 101.
Illustratively, the water treated by the degradation tank 2 is finally discharged from the water inlet pipe 301 into the disinfection tank 3 for disinfection treatment through the water pipe 101, and the disinfected water is discharged from the water outlet pipe 302 and discharged into the ultrafiltration device 4 through the water pipe 101 for filtration.
Referring to fig. 1, a dosing tube 601 is fixedly connected to one side of the top of the chemical tank 6, and the dosing tube 601 extends to the inside of the chemical tank 6 near the chemical tank 6.
Illustratively, the disinfectant can be conveniently filled into the medicament box 6 through the medicament feeding pipe 601.
Referring to fig. 1, a motor switch 801 is installed on one side of the surface of the motor 8, and a current input end of the motor 8 is electrically connected with an external power supply through the motor switch 801.
Illustratively, the motor switch 801 can control the communication between the motor 8 and an external power source, thereby controlling the operation and shutdown of the motor 8.
When the device is used, a water body to be treated is discharged into the sedimentation tank 1 for sedimentation treatment, the water body is discharged into the degradation tank 2 for degradation treatment through the water conveying pipe 101 after the sedimentation treatment is finished, the water body treated by the degradation tank 2 is finally discharged into the disinfection box 3 from the water inlet pipe 301 through the water conveying pipe 101 for disinfection treatment, the disinfected water body is discharged from the water discharging pipe 302 and is discharged into the ultrafiltration device 4 through the water conveying pipe 101 for filtration, disinfectant can be conveniently filled into the medicine box 6 through the medicine adding pipe 601, the medicine box 6 is used for storing disinfectant and conveying the medicine into the disinfection box 3 through the medicine discharging pipe 602 penetrating through the top cover 5, the torsion spring 7 is installed at the bottom of the top cover 5 and is movably connected with the baffle 701 and the connecting rod 702 through the torsion spring 7, the baffle 701 blocks the medicine discharging pipe 602 in the medicine box 6 at ordinary times to prevent the medicine in the medicine box 6 from being discharged, when the circulating water recycling treatment device operates, the motor 8 is powered on through the motor switch 801, the motor 8 operates to drive the stirring rod 9 and the limiting rod 803 to rotate through the transmission shaft 802, the limiting rod 803 follows the transmission shaft 802 to do circular motion and is in intermittent contact with the connecting rod 702, when the limiting rod 803 moves to the position in contact with the connecting rod 702, the connecting rod 702 is pushed and drives the baffle 701 to shift through the torsion spring 7, so that the medicament in the medicament box 6 is discharged into the disinfection box 3 through the medicament discharge pipe 602, when the limiting rod 803 is far away from the connecting rod 702, the baffle 701 automatically resets and blocks the medicament discharge pipe 602 under the elastic force action of the torsion spring 7, the medicament feeding is stopped, the intermittent medicament feeding in the disinfection box 3 is realized by the operation of the motor 8, the manual medicament feeding treatment is replaced, the manual operation is greatly reduced, the time and labor are saved, the stirring rod 9 is, one end of a telescopic rod 901 is inserted into the stirring rod 9, the other end of the telescopic rod 901 is provided with a brush plate 902, the stirring rod 9 is connected with the telescopic rod 901 through an adjusting bolt 903, when the inside of the disinfection box 3 is normally disinfected, the telescopic rod 901 is contracted into the stirring rod 9, the brush plate 902 is far away from the inner wall of the disinfection box 3, the stirring rod 9 stirs water flowing through the inside of the disinfection box 3 along with the normal rotation of a transmission shaft 802 at the moment, the fusion of medicaments is accelerated, when the inner side wall of the disinfection box 3 needs to be cleaned, only the adjusting bolt 903 needs to be unscrewed, the telescopic rod 901 is extended until the brush plate 902 just contacts with the inner wall of the disinfection box 3, the adjusting bolt 903 is screwed to fix the length of the telescopic rod 901, at the moment, the motor 8 runs, the stirring rod 9 rotates, and drives the brush plate 902 to rotate through the telescopic rod 901, the brush plate 902 contacts with, the convenience of cleaning the inner wall of the disinfection box 3 is greatly improved, and the cleaning quality is better.
It should be noted that, the utility model relates to a circulating water drainage retrieval and utilization processing apparatus, including sedimentation tank 1, raceway 101, degradation pond 2, disinfect box 3, inlet tube 301, drain pipe 302, ultrafiltration device 4, top cap 5, chemical tank 6, add pencil 601, discharge tube 602, torsion spring 7, baffle 701, connecting rod 702, motor 8, motor switch 801, transmission shaft 802, gag lever post 803, poking bar 9, telescopic link 901, brush board 902, adjusting bolt 903, the part is general standard or the part that technical staff in the field knows, its structure and principle all are that this technical staff all can learn through the technical manual or learn through conventional experimental approach.
The motor 8 and the motor switch 801 are conventional products in the prior art, the model of the motor 8 is Y180L, the model of the motor switch 801 is NS2-25, and the internal structure is not described.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. The utility model provides a circulating water drainage retrieval and utilization processing apparatus, includes sedimentation tank (1), raceway (101), degradation pond (2), disinfect box (3) and ultrafiltration device (4), its characterized in that, sedimentation tank (1) is connected with degradation pond (2) through raceway (101), disinfect box (3) are connected with ultrafiltration device (4) through raceway (101), disinfect box (3) top detachably is connected with top cap (5), medicament case (6) are installed to top cap (5) top, medicament case (6) bottom fixedly connected with run through the row's pencil (602) of top cap (5), torsion spring (7) are installed to top cap (5) bottom one side, top cap (5) have baffle (701) and connecting rod (702) through torsion spring (7) swing joint, baffle (701) are located row's pencil (602) bottom, motor (8) are installed at top cap (5) top, motor (8) power take off end can dismantle and be connected with transmission shaft (802) that extend to disinfect box (3) inside, transmission shaft (802) surface top fixedly connected with gag lever post (803), transmission shaft (802) surface fixedly connected with stirring rod (9) and stirring rod (9) are a plurality of, stirring rod (9) inside is pegged graft and is had telescopic link (901), telescopic link (901) are kept away from stirring rod (9) one side and are installed brush board (902), adjusting bolt (903) are installed to stirring rod (9) surface one side.
2. A circulating water drainage recycling treatment device as claimed in claim 1, wherein a water inlet pipe (301) is fixedly connected to one side of the surface of the disinfection tank (3), the water outlet end of the degradation tank (2) is connected with the water inlet pipe (301) through a water pipe (101), a water outlet pipe (302) is fixedly connected to the bottom of the disinfection tank (3), and the water outlet pipe (302) is connected with the water inlet end of the ultrafiltration device (4) through the water pipe (101).
3. The circulating water drainage recycling treatment device according to claim 1, wherein a chemical feeding pipe (601) is fixedly connected to one side of the top of the chemical tank (6), and one side of the chemical feeding pipe (601) close to the chemical tank (6) extends into the chemical tank (6).
4. A circulating water drainage recycling treatment device as claimed in claim 1, wherein a motor switch (801) is installed on one side of the surface of the motor (8), and the current input end of the motor (8) is electrically connected with an external power supply through the motor switch (801).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020329658.8U CN211946583U (en) | 2020-03-17 | 2020-03-17 | Circulating water drainage retrieval and utilization processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020329658.8U CN211946583U (en) | 2020-03-17 | 2020-03-17 | Circulating water drainage retrieval and utilization processing apparatus |
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| Publication Number | Publication Date |
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| CN211946583U true CN211946583U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020329658.8U Expired - Fee Related CN211946583U (en) | 2020-03-17 | 2020-03-17 | Circulating water drainage retrieval and utilization processing apparatus |
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| Country | Link |
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| CN (1) | CN211946583U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354135A (en) * | 2021-05-08 | 2021-09-07 | 赖波 | Energy-concerving and environment-protective industrial sewage treatment device |
| CN113957947A (en) * | 2021-11-01 | 2022-01-21 | 上海邦浦实业集团有限公司 | Secondary water supply equipment with wireless monitoring device |
| CN115286080A (en) * | 2022-06-13 | 2022-11-04 | 华能伊春热电有限公司 | Energy-saving efficient formula degassing unit that disinfects for rainwater treatment |
| CN116947129A (en) * | 2023-08-14 | 2023-10-27 | 杭州航民达美染整有限公司 | Textile printing and dyeing sewage treatment device |
-
2020
- 2020-03-17 CN CN202020329658.8U patent/CN211946583U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113354135A (en) * | 2021-05-08 | 2021-09-07 | 赖波 | Energy-concerving and environment-protective industrial sewage treatment device |
| CN113957947A (en) * | 2021-11-01 | 2022-01-21 | 上海邦浦实业集团有限公司 | Secondary water supply equipment with wireless monitoring device |
| CN115286080A (en) * | 2022-06-13 | 2022-11-04 | 华能伊春热电有限公司 | Energy-saving efficient formula degassing unit that disinfects for rainwater treatment |
| CN116947129A (en) * | 2023-08-14 | 2023-10-27 | 杭州航民达美染整有限公司 | Textile printing and dyeing sewage treatment device |
| CN116947129B (en) * | 2023-08-14 | 2024-05-31 | 杭州航民达美染整有限公司 | Textile printing and dyeing sewage treatment device |
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Granted publication date: 20201117 |