CN220467749U - Treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction - Google Patents
Treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction Download PDFInfo
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- CN220467749U CN220467749U CN202321353378.0U CN202321353378U CN220467749U CN 220467749 U CN220467749 U CN 220467749U CN 202321353378 U CN202321353378 U CN 202321353378U CN 220467749 U CN220467749 U CN 220467749U
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- 239000003673 groundwater Substances 0.000 title claims abstract description 48
- 238000006722 reduction reaction Methods 0.000 title claims abstract description 46
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 41
- 238000012163 sequencing technique Methods 0.000 title claims abstract description 16
- 238000004062 sedimentation Methods 0.000 claims abstract description 59
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 230000009467 reduction Effects 0.000 claims abstract description 29
- 239000003513 alkali Substances 0.000 claims abstract description 28
- 230000020477 pH reduction Effects 0.000 claims abstract description 28
- 239000002253 acid Substances 0.000 claims abstract description 27
- 238000003860 storage Methods 0.000 claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 238000005086 pumping Methods 0.000 claims abstract description 17
- 239000002351 wastewater Substances 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical group [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010802 sludge Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000000605 extraction Methods 0.000 description 5
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 230000037452 priming Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- -1 printing and dyeing Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The utility model relates to a treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction, which comprises an adjusting tank, an acidification tank, a reduction tank, a reaction tank and a sedimentation tank which are connected in sequence; the water inlet of the regulating tank is connected with a pumping well for pumping Cr (VI) polluted groundwater; the acidification tank is also connected with an acid liquor tank, an acid liquor is arranged in the acid liquor tank, the reduction tank is also connected with a reducing agent liquid storage tank, a reducing agent is arranged in the reducing agent liquid storage tank, the reaction tank is also connected with an alkali liquor tank, alkali liquor is arranged in the alkali liquor tank, the sedimentation tank is also connected with a flocculant liquid storage tank, and a flocculant is arranged in the flocculant liquid storage tank; the sedimentation tank is provided with a water outlet and a mud discharge outlet, clear water obtained after the treatment of the Cr (VI) polluted groundwater by the sedimentation tank is discharged through the water outlet, and the obtained mud is discharged through the mud discharge outlet. The processing system has the advantages of short processing time, low cost and good application effect.
Description
Technical Field
The utility model relates to the field of groundwater environment restoration, in particular to a treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction.
Background
The pollution of the Cr (VI) in the groundwater mainly comes from industries such as metallurgy, electroplating, tanning, paint, printing and dyeing, and waste water and waste residues containing the Cr (VI) generated in the processes of production, storage, transportation, disposal and the like enter the groundwater through the effects of soil infiltration, rainfall leaching and underground runoff, and the mobility of the Cr (VI) is strong and has cancerogenic effect, so that serious adverse effects are brought to the underground environment and human health. In order to solve the problem, the repair of Cr (VI) in the groundwater of a Cr (VI) polluted site is urgent and necessary, and groundwater extraction is a common and effective method, and the technology has the advantages of short treatment period, simple and convenient equipment required by the technology, and wide application range.
However, the extracted groundwater cannot be directly discharged due to the high concentration of Cr (VI), and the groundwater is discharged after reaching the standard by using portable vehicle-mounted treatment equipment or being discharged into a sewage treatment plant. Therefore, the on-site groundwater extraction and restoration can be influenced by a plurality of factors such as the geographical location of the site, daily sewage treatment capacity of the vehicle-mounted equipment and the like, so that the efficiency is low, and the groundwater restoration cost is increased. Therefore, it is necessary to improve the common extraction repair so that the extracted Cr (VI) polluted underground water can be simply and quickly treated on site.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction.
The utility model comprises the following specific contents: a treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction comprises an adjusting tank, an acidification tank, a reduction tank, a reaction tank and a sedimentation tank which are connected in sequence; the water inlet of the regulating tank is connected with a pumping well for pumping Cr (VI) polluted groundwater; the acidification tank is also connected with an acid liquor tank, an acid liquor is arranged in the acid liquor tank, the reduction tank is also connected with a reducing agent liquid storage tank, a reducing agent is arranged in the reducing agent liquid storage tank, the reaction tank is also connected with an alkali liquor tank, alkali liquor is arranged in the alkali liquor tank, the sedimentation tank is also connected with a flocculant liquid storage tank, and a flocculant is arranged in the flocculant liquid storage tank; the sedimentation tank is provided with a water outlet and a mud discharge outlet, clear water obtained after the treatment of the Cr (VI) polluted groundwater by the sedimentation tank is discharged through the water outlet, and the obtained mud is discharged through the mud discharge outlet.
Further, the regulating tank, the acidification tank, the reduction tank, the reaction tank and the sedimentation tank are of an open structure, and the to-be-treated polluted groundwater is transferred into the next tank through the self-priming pump in sequence among the regulating tank, the acidification tank, the reduction tank and the reaction tank, and the wastewater in the reaction tank is mixed with alkali liquor and then flows into the sedimentation tank automatically.
Further, a first Cr (VI) detector for detecting the Cr (VI) concentration of the wastewater in the regulating tank is arranged in the regulating tank; the acid liquid tank is communicated with an acidification tank through an acid liquid metering pump, and a pH detector is arranged in the acidification tank; the reducing agent liquid storage tank is communicated with the reducing tank through a reducing agent metering pump, and a second Cr (VI) detector for detecting the Cr (VI) concentration of the wastewater in the reducing tank is arranged in the reducing tank; the alkali solution tank is communicated with the reaction tank through an alkali solution metering pump; the flocculant storage tank is communicated with the sedimentation tank through a flocculant metering pump, and a third Cr (VI) detector for detecting the Cr (VI) concentration of wastewater in the sedimentation tank is arranged in the sedimentation tank.
Further, the bottom of sedimentation tank is equipped with the mud collecting hopper, and the bottom of mud collecting hopper suits with the bottom of sedimentation tank, is the arc, and the mud discharging port sets up in the bottom central authorities of mud collecting hopper.
Further, the sedimentation tank is provided with a plurality of support columns which are uniformly arranged at the bottom edge of the sedimentation tank and enable the bottom of the mud discharging opening to be higher than the horizontal plane where the sedimentation tank is located.
Further, the clear water after the reaction in the sedimentation tank is discharged through the water outlet and is reinjected into the pumping well.
Further, the acid liquid in the acid liquid tank is hydrochloric acid, the reducing agent in the reducing agent storage tank is sodium bisulphite, the alkali liquid in the alkali liquid tank is sodium hydroxide, and the flocculant in the flocculant storage tank is PAM (polyacrylamide).
Further, stirring mechanisms are arranged in the acidification tank, the reduction tank, the reaction tank and the sedimentation tank
The utility model has the beneficial effects that: by the treatment system, the water quantity of the polluted groundwater is balanced through the regulating tank, the pH value in the groundwater is regulated through the acidification tank, the necessary acidic condition is provided for the reduction treatment of Cr (VI), the Cr (VI) is converted into Cr (III) through the reduction tank, and the Cr (III) is converted into Cr (OH) through the reaction tank and the sedimentation tank 3 And (3) flocculating and settling to remove the wastewater. The treatment system is built on site according to site conditions such as groundwater extraction quantity and the like so as to solve the problems of small daily treatment quantity, relatively fixed daily treatment quantity and high outward transportation treatment cost of vehicle-mounted equipment. The treatment system has the advantages of short treatment time, low cost, cooperation in groundwater extraction, capability of reducing leakage or scattering of Cr (VI) -containing groundwater in the transportation process, flexible treatment and small influence of the change of the extracted groundwater amount, and good application effect.
Drawings
The following description of the embodiments of the utility model is further defined by reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of a processing system according to the present utility model;
FIG. 2 is a schematic diagram of a treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction in accordance with the utility model.
Wherein, 1, an adjusting pool; 2. an acidification tank; 3. a reduction pool; 4. a reaction tank; 5. a sedimentation tank; 6. an acid liquid tank; 7. a reducing agent storage tank; 8. an alkali solution tank; 9. a flocculant storage tank; 10. a first self priming pump; 11. a second self priming pump; 12. a third self priming pump; 13. a first Cr (VI) detector; 14. a second Cr (VI) detector; 15. a third Cr (VI) detector; 16. a pH detector; 17. a water outlet; 18. a mud collecting hopper; 19. a mud discharging port; 20. a support column; 21. an acid liquor metering pump; 22. a reducing agent metering pump; 23. an alkali liquor metering pump; 24. and (3) a flocculant metering pump.
Detailed Description
With reference to fig. 1 and 2, the utility model provides a treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction.
The treatment system of the application comprises a regulating tank 1, an acidification tank 2, a reduction tank 3, a reaction tank 4, a sedimentation tank 5, an acid liquor tank 6, a reducing agent storage tank 7, an alkali liquor tank 8 and a flocculating agent storage tank 9. Wherein, equalizing basin 1, acidizing pond 2, reduction pond 3, reaction tank 4, sedimentation tank 5 set gradually according to the waste water flow direction, all adopt open form, link to each other through the self priming pump in proper order between equalizing basin 1, acidizing pond 2, reduction pond 3, the reaction tank 4 and change into next pond with treating polluted groundwater, waste water in the reaction tank 4 flows into sedimentation tank 5 automatically after mixing with alkali lye. In this embodiment, each reaction tank has a rectangular structure as a whole.
The water inlet of the regulating tank 1 is connected with a pumping well for extracting Cr (VI) polluted groundwater, and a first Cr (VI) detector 13 for detecting the concentration of Cr (VI) in the wastewater in the regulating tank 1 is arranged on the regulating tank 1. The regulating tank plays a role in regulating water quantity, and prevents pumping efficiency from being influenced by slow treatment speed.
The water outlet of the regulating tank 1 is communicated with the water inlet of the acidification tank 2 through a first self-priming pump 10 to pump the wastewater in the regulating tank 1 into the acidification tank 2. The acid liquid tank 6 is communicated with the acidification tank 2 through an acid liquid metering pump 21 to provide quantitative acid liquid for the acidification of the wastewater in the acidification tank 2. The acid tank 2 plays a role in regulating the pH value in the groundwater, and provides necessary acidic conditions for the reduction treatment of Cr (VI). The pH detector is arranged in the acid liquid tank, and in the application, the acid liquid in the acid liquid tank is hydrochloric acid. And according to the detected pH value, transferring the pH value to a reduction tank 3 after the pH value is less than or equal to 3.
The water inlet of the reduction tank 3 is communicated with the water outlet of the acidification tank 2 through a second self-priming pump 11, and the reducing agent storage tank 7 is communicated with the reduction tank 3 through a reducing agent metering pump 22 to provide quantitative reducing agent for Cr (VI) in the wastewater in the reduction tank 3 so as to convert the Cr (VI) into Cr (III). In this example, the reducing agent is sodium bisulphite. A second Cr (VI) detector 14 for detecting whether the wastewater in the reduction tank 3 has reached the standard for the next treatment is provided in the reduction tank 3. In this example, the Cr (VI) concentration of less than 0.05mg/L can be used to enter the next processing standard.
The water inlet of the reaction tank 4 is communicated with the water outlet of the reduction tank 3 through a third self-priming pump 12, the alkali solution tank 8 is communicated with the reaction tank 4 through an alkali solution metering pump 23, alkali solution is added into the wastewater in the reaction tank 4, and Cr (III) is converted into Cr (OH) 3. In this embodiment, the alkali solution in the reaction tank 4 is sodium hydroxide.
The wastewater mixed with alkali liquor in the reaction tank 4 automatically flows into the sedimentation tank 5. The flocculant storage tank 9 of the sedimentation tank 5 is communicated with the sedimentation tank 5 through a flocculant metering pump 24 and is used for adding Cr (OH) in the sedimentation tank 5 3 Converted to a precipitate. In this embodiment, the flocculant of the flocculant tank 9 is PAM.
The sedimentation tank is also internally provided with a third Cr (VI) detector for detecting the Cr (VI) concentration of wastewater in the sedimentation tank, the supernatant Cr (VI) concentration in the sedimentation tank can be reinjected into a pumping well after reaching the standard, and the Cr (VI) concentration needs to meet the corresponding requirements of the groundwater quality standard (GB/T14848-2017).
One side of the sedimentation tank 5 is provided with a water outlet 17 with a valve, and the water outlet 17 can discharge clear water in the sedimentation tank 5 out of the system for collection or subsequent use. The sedimentation tank 5 further comprises a sludge hopper 18 at the bottom, and a sludge discharge opening 19 for discharging sludge precipitated in the sludge hopper 18, the sludge discharge opening 19 being located at the bottom of the sludge hopper 18 for discharging sludge out of the system. The lower surface of sedimentation tank 5 is fixed mounting has support column 20, and the quantity of support column 20 is four sets of, and four sets of support columns 20 are rectangle and distribute in the lower surface of sedimentation tank 5, and support column 20 is used for supporting sedimentation tank 5 and makes the bottom of mud mouth be higher than the horizontal plane that the sedimentation tank was located, makes sedimentation tank 5 can stable operation and the discharge of the in-process mud of being convenient for.
In this embodiment, stirring mechanisms are preferably arranged in the acidification tank 2, the reduction tank 3, the reaction tank 4 and the sedimentation tank 5. The reaction efficiency in each pool is conveniently improved.
According to the treatment system of the embodiment, the following processes are adopted for treating the polluted groundwater: the method comprises the steps of discharging Cr (VI) polluted groundwater pumped from a pumping well into a regulating tank 1 to balance water, pumping the wastewater into an acidification tank 2 through a first self-priming pump 10 after detecting Cr (VI) concentration, adding hydrochloric acid into the acidification tank 2, stirring for 0.5h, adjusting pH to be less than or equal to 3, pumping the acidified wastewater into a reduction tank 3 through a second self-priming pump 11, adding sodium bisulfate into the reduction tank 3, stirring for 1.5h, pumping the acidified wastewater into a reaction tank 4 through a third self-priming pump 12 after detecting Cr (VI) concentration is less than 0.05mg/L, adding sodium hydroxide into the reaction tank 4, stirring, allowing the effluent of the reaction tank 4 to flow into a sedimentation tank 5, adding PAM into the sedimentation tank 5, stirring for 1.5h, forming flocculation sediment, storing sludge after mud-water separation, periodically dehydrating, carrying out or filling, and pumping supernatant liquid after Cr (VI) concentration reaches the standard, and detecting that the supernatant liquid can reach the standard, and then be returned to the pumping well.
The utility model adopts a chemical reduction method, can effectively remove Cr (VI) in the groundwater, and the discharged water meets the corresponding requirements of groundwater quality standard (GB/T14848-2017). The whole system has the characteristics of compact occupation of land, simple operation and lower running cost, and is suitable for groundwater remediation and treatment in soil remediation engineering.
In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The foregoing description is only of a preferred embodiment of the utility model, which can be practiced in many other ways than as described herein, so that the utility model is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model without departing from the technical solution of the present utility model still falls within the scope of the technical solution of the present utility model.
Claims (8)
1. A treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction is characterized in that: comprises an adjusting tank, an acidification tank, a reduction tank, a reaction tank and a sedimentation tank which are connected in sequence; the water inlet of the regulating tank is connected with a pumping well for pumping Cr (VI) polluted groundwater; the acidification tank is also connected with an acid liquor tank, an acid liquor is arranged in the acid liquor tank, the reduction tank is also connected with a reducing agent liquid storage tank, a reducing agent is arranged in the reducing agent liquid storage tank, the reaction tank is also connected with an alkali liquor tank, alkali liquor is arranged in the alkali liquor tank, the sedimentation tank is also connected with a flocculant liquid storage tank, and a flocculant is arranged in the flocculant liquid storage tank; the sedimentation tank is provided with a water outlet and a mud discharge outlet, clear water obtained after the treatment of the Cr (VI) polluted groundwater by the sedimentation tank is discharged through the water outlet, and the obtained mud is discharged through the mud discharge outlet.
2. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: the regulating tank, the acidification tank, the reduction tank, the reaction tank and the sedimentation tank are of an open structure, and the to-be-treated polluted groundwater is transferred into the next tank through the connection of a self-priming pump among the regulating tank, the acidification tank, the reduction tank and the reaction tank, and the wastewater in the reaction tank and alkali liquor are mixed and then automatically flow into the sedimentation tank.
3. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: a first Cr (VI) detector for detecting the Cr (VI) concentration of the wastewater in the regulating tank is arranged in the regulating tank; the acid liquid tank is communicated with an acidification tank through an acid liquid metering pump, and a pH detector is arranged in the acidification tank; the reducing agent liquid storage tank is communicated with the reducing tank through a reducing agent metering pump, and a second Cr (VI) detector for detecting the Cr (VI) concentration of the wastewater in the reducing tank is arranged in the reducing tank; the alkali solution tank is communicated with the reaction tank through an alkali solution metering pump; the flocculant storage tank is communicated with the sedimentation tank through a flocculant metering pump, and a third Cr (VI) detector for detecting the Cr (VI) concentration of wastewater in the sedimentation tank is arranged in the sedimentation tank.
4. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: the bottom of sedimentation tank is equipped with the collection mud bucket, and the bottom of collection mud bucket suits with the bottom of sedimentation tank, is the arc, and the mud mouth sets up in the bottom central authorities of collection mud bucket.
5. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction in accordance with claim 4, wherein: the sedimentation tank is equipped with a plurality of support columns, and the support column evenly sets up in the bottom edge of sedimentation tank and makes the bottom of mud mouth be higher than the horizontal plane that the sedimentation tank was located.
6. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: and discharging the clear water after the reaction in the sedimentation tank through a water outlet, and reinjecting the clear water into a pumping well.
7. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: the acid liquor in the acid liquor tank is hydrochloric acid, the reducing agent in the reducing agent storage tank is sodium bisulphite, the alkali liquor in the alkali liquor tank is sodium hydroxide, and the flocculant in the flocculant storage tank is PAM.
8. The treatment system for treating Cr (VI) contaminated groundwater by sequencing batch chemical reduction according to claim 1, wherein: stirring mechanisms are arranged in the acidification tank, the reduction tank, the reaction tank and the sedimentation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321353378.0U CN220467749U (en) | 2023-05-30 | 2023-05-30 | Treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321353378.0U CN220467749U (en) | 2023-05-30 | 2023-05-30 | Treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction |
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| Publication Number | Publication Date |
|---|---|
| CN220467749U true CN220467749U (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321353378.0U Active CN220467749U (en) | 2023-05-30 | 2023-05-30 | Treatment system for treating Cr (VI) polluted groundwater by sequencing batch chemical reduction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220467749U (en) |
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2023
- 2023-05-30 CN CN202321353378.0U patent/CN220467749U/en active Active
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