CN211445448U - Sewage recovery processing system of steel pipe factory - Google Patents
Sewage recovery processing system of steel pipe factory Download PDFInfo
- Publication number
- CN211445448U CN211445448U CN201922482930.6U CN201922482930U CN211445448U CN 211445448 U CN211445448 U CN 211445448U CN 201922482930 U CN201922482930 U CN 201922482930U CN 211445448 U CN211445448 U CN 211445448U
- Authority
- CN
- China
- Prior art keywords
- tank
- communicated
- pipeline
- outlet
- sludge
- 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.)
- Active
Links
Images
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The utility model discloses a sewage recovery treatment system of a steel pipe plant, which comprises an acid adding tank, wherein an acid adding port of the acid adding tank is communicated with an acid liquor storage tank; the liquid inlet of the alkali adding tank is communicated with the liquid outlet of the acid adding tank; the alkali adding port is communicated with the alkali liquor storage tank through an alkali adding pipeline; a liquid inlet of the sedimentation tank is communicated with a liquid outlet of the alkali adding tank; the liquid inlet of the single-effect evaporator is communicated with the supernatant outlet of the sedimentation tank, the steam outlet of the single-effect evaporator is communicated with the inlet of the condenser, and the condenser is provided with a liquid outlet; a liquid inlet of the recovery storage tank is communicated with a liquid outlet of the condenser; the sludge inlet of the sludge storage tank is communicated with the sludge outlet of the sedimentation tank through a pipeline, the sludge outlet of the sludge storage tank is communicated with the sludge inlet of the plate-type filter press, and the filtrate outlet of the plate-type filter press is communicated with the liquid inlet of the single-effect evaporator through a filtrate return pipeline. The sewage recovery treatment system can treat and recycle the sewage of a steel pipe plant, and zero emission is realized.
Description
Technical Field
The utility model relates to a steel pipe factory sewage recovery processing system for handle steel pipe factory's sewage.
Background
The sewage of a steel pipe factory is the sewage used for pickling and phosphating the steel pipe in the production process of the steel pipe, and the sewage contains ferrous ions, metal particles and organic grease used in pickling and phosphating. With the increasing strictness of environmental protection, zero emission is generally required for metal processing enterprises, but the current steel pipe plant does not have a special treatment system and a treatment method, and sewage cannot be recycled without treatment, so that the common steel pipe plant can simply filter the sewage, filter particulate matters in the sewage and recycle the sewage again, although ferrous ions and organic oil contained in the sewage are not influenced too much in the phosphating process for a short time, the production of steel pipes is influenced if the sewage is accumulated for a long time, and therefore a sewage recycling treatment system for the steel pipe plant is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the sewage recovery treatment system can treat and recycle the sewage of the steel pipe plant, and zero emission is realized.
In order to solve the technical problem, the technical scheme of the utility model is that: a sewage recovery treatment system for a steel pipe plant comprises
The acid adding tank is provided with an acid adding port and a sewage adding port at the upper part and a liquid outlet at the bottom, and the acid adding port is communicated with the acid liquid storage tank through an acid adding pipeline;
the alkali adding tank is provided with an alkali adding port, a liquid inlet and a liquid outlet, and the liquid inlet of the alkali adding tank is communicated with the liquid outlet of the acid adding tank through a pipeline; the alkali adding port is communicated with the alkali liquor storage tank through an alkali adding pipeline;
the liquid inlet of the sedimentation tank is communicated with the liquid outlet of the alkali adding tank through a pipeline, the bottom of the sedimentation tank is provided with a sludge outlet, and the upper part of the sedimentation tank is provided with a supernatant outlet;
the liquid inlet of the single-effect evaporator is communicated with the supernatant outlet of the sedimentation tank through a pipeline, the steam outlet of the single-effect evaporator is communicated with the inlet of the condenser, and the condenser is provided with a liquid outlet;
the liquid inlet of the recovery storage tank is communicated with the liquid outlet of the condenser through a pipeline;
plate filter press and mud storage tank, pipeline intercommunication between the mud mouth of mud storage tank and the mud mouth of sedimentation tank, intercommunication between the mud mouth of mud storage tank and the mud mouth of plate filter press, the filtrating export of plate filter press is through filtrating return line and single effect evaporator's inlet intercommunication.
As a preferable scheme, the sewage recovery and treatment system further comprises a biochemical tank for a contact oxidation method, wherein the biochemical tank is arranged between the liquid inlet of the recovery storage tank and the liquid outlet of the condenser; the liquid inlet of the biochemical pond is communicated with the liquid outlet of the condenser through a front pipeline, the liquid outlet of the biochemical pond is communicated with the liquid inlet of the recovery storage tank, the bottom of the biochemical pond is provided with a sludge discharge port, and the sludge discharge port is communicated with the sludge inlet of the sludge storage tank through a sludge return pipeline.
As a preferable scheme, the bottom of the acid adding tank is also provided with a sludge outlet which is communicated with a liquid inlet of the sedimentation tank through a pipeline.
As a preferred scheme, the acid adding pipeline comprises an acid adding pipeline, an acid adding metering pump and an acid adding control valve are arranged on the acid adding pipeline, the alkali adding pipeline comprises an alkali adding pipeline, and an alkali adding metering pump and an alkali adding control valve are arranged on the alkali adding pipeline.
As a preferable scheme, a residue outlet at the bottom of the single-effect evaporator is communicated with a sludge inlet of the plate filter press through a pipeline.
After the technical scheme is adopted, the utility model discloses an effect is: the treatment system can firstly add collected sewage into an acid adding tank, then add sulfuric acid into the acid adding tank for demulsification, decompose organic grease, and separate the organic grease from water into two insoluble phases so as to achieve the purpose of separation; then the sewage enters an alkali adding tank, sodium hydroxide and calcium hydroxide are added for destabilization, so that ferrous precipitates can be formed into precipitates, calcium phosphate precipitates can be formed at the same time, and particulate matters in the sewage and the ferrous precipitates can form alum floc to improve the precipitation effect; then the sewage enters a sedimentation tank for sedimentation, the supernatant is sent to a single-effect evaporator for evaporation and condensation to finally obtain condensed water for recycling, and the precipitated sludge residue is sent to a sludge storage tank for storage and concentration and is finally subjected to filter pressing by a plate filter press to form a filter cake, so that the recovery treatment device can conveniently treat the sewage, recover water resources, reduce pollution and really realize zero emission.
The sewage recovery and treatment system also comprises a biochemical tank for a contact oxidation method, and the biochemical tank is arranged between the liquid inlet of the recovery storage tank and the liquid outlet of the condenser; the liquid inlet of the biochemical pond is communicated with the liquid outlet of the condenser through a front pipeline, the liquid outlet of the biochemical pond is communicated with the liquid inlet of the recovery storage tank, a sludge discharge port is formed in the bottom of the biochemical pond, and the sludge discharge port is communicated with the sludge inlet of the sludge storage tank through a sludge return pipeline, so that the recovery processing system further comprises the biochemical pond, the distilled condensate water can be processed again by utilizing the biochemical pond, some organic matters possibly exist in the distilled condensate water, the organic matters are distilled out along with water vapor in the distillation process, and the organic matters can be decomposed again through the biochemical treatment of a contact oxidation method of the biochemical pond, so that the liquid after the final biochemical treatment can be recycled, and the production of the steel pipe is not influenced.
And because the bottom of the acidification tank is also provided with a sludge outlet which is communicated with the liquid inlet of the sedimentation tank through a pipeline, certain precipitated sludge can be possibly remained after the acidification tank is used for a long time, so that the sludge can be directly conveyed to the sedimentation tank for sedimentation, the bottom of the acidification tank is ensured to be clean, and sludge sedimentation is avoided.
And because the residue outlet at the bottom of the single-effect evaporator is communicated with the sludge inlet of the plate-type filter press through a pipeline, the residue left after the evaporation of the single-effect evaporator is directly conveyed into the plate-type filter press for uniform filter pressing, thereby further reducing the discharge of solid-liquid mixture.
In addition, the utility model also discloses a steel pipe factory sewage recovery processing method, it includes following step:
s1, recycling and collecting the sewage of the steel pipe factory;
s2, adding the sewage into an acid adding tank;
s3, adding a sulfuric acid solution into the acid adding tank to enable the pH value in the acid adding tank to be 3-4;
s4, adding the sewage in the acid adding tank into an alkali adding tank;
s5, adding sodium hydroxide solution and calcium hydroxide into the alkali adding tank to maintain the pH value in the alkali adding tank between 8 and 10;
s6, feeding the liquid in the alkali adding tank into a sedimentation tank, and quantitatively adding PAM into the sedimentation tank for sedimentation for 3-5 h;
s7, adding the supernatant of the sedimentation tank into a single-effect evaporator for distillation; the sludge in the sedimentation tank flows into a sludge storage tank;
s8, condensing the distilled gas through a condenser to form condensed liquid, and allowing the condensed liquid to flow into a recovery storage tank for recovery and reuse;
s9, the sludge in the sludge storage tank is precipitated and concentrated and then sent to a plate filter press for pressure filtration to obtain a filter cake, and the filtrate flows back to the single-effect evaporator.
Preferably, in step S8, the condensed liquid is added to the biochemical pool for contact oxidation before entering the recovery storage tank, and the obtained supernatant is sent to the recovery storage tank for recovery and reuse.
Wherein, the distillation in the step S7 adopts negative pressure distillation, the pressure is controlled to be 80-90Kpa, and the distillation temperature is controlled to be 80-85 ℃.
After the technical scheme is adopted, the utility model discloses an effect is: the treatment method uses the treatment system, and condensed water obtained after acid addition, alkali addition, precipitation, distillation and biochemical treatment are carried out on the sewage of the steel pipe plant can be applied to the industry of steel pipe production again, so that the utilization of water resources is reduced, and zero emission is realized.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
in the drawings: 1. adding an acid tank; 101. a sewage adding port; 102. adding an acid port; 103. a sludge outlet; 2. adding alkali into the tank; 21. adding an alkali port; 22. a liquid outlet; 3. an acid liquor storage tank; 4. an alkali liquor storage tank; 5. an acid adding pipeline; 6. an alkali adding pipeline; 7. adding an acid metering pump; 8. adding an alkali metering pump; 9. a sedimentation tank; 10. a single-effect evaporator; 1001. a residue outlet; 11. a condenser; 12. a biochemical pool; 13. a recovery storage tank; 14. a plate filter press; 141. a filtrate outlet; 15. a sludge storage tank.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
As shown in figure 1, a sewage recycling system for steel tube plant comprises
The acid adding device comprises an acid adding tank 1, wherein the upper part of the acid adding tank 1 is provided with an acid adding port 102 and a sewage adding port 101, the bottom of the acid adding tank 1 is provided with a liquid outlet 22, and the acid adding port 102 is communicated with an acid liquid storage tank 3 through an acid adding pipeline 5; the bottom of the acid adding tank 1 is also provided with a sludge outlet 103, and the sludge outlet 103 is communicated with a liquid inlet of the sedimentation tank 9 through a pipeline.
The alkali adding tank 2 is provided with an alkali adding port 21, a liquid inlet and a liquid outlet 22, and the liquid inlet of the alkali adding tank 2 is communicated with the liquid outlet 22 of the acid adding tank 1 through a pipeline; the alkali adding port 21 is communicated with the alkali liquor storage tank 4 through an alkali adding pipeline 6; wherein, add sour pipeline 5 including add sour pipeline, be provided with on the acidification pipeline and add sour control valve with sour measuring pump 7, add alkali pipeline 6 including adding alkali pipeline, be provided with on the alkali pipeline and add alkali measuring pump 8 and add alkali control valve. The acid and alkali can be accurately controlled by using the acid dosing pump 7 and the alkali dosing pump 8. Wherein the acid solution is sulfuric acid, and the alkali is sodium hydroxide and calcium hydroxide.
A sedimentation tank 9, wherein a liquid inlet of the sedimentation tank 9 is communicated with a liquid outlet 22 of the alkali adding tank 2 through a pipeline, a sludge outlet is formed in the bottom of the sedimentation tank 9, and a supernatant outlet is formed in the upper part of the sedimentation tank 9;
the single-effect evaporator 10 is characterized in that a liquid inlet of the single-effect evaporator 10 is communicated with a supernatant outlet of the sedimentation tank 9 through a pipeline, a steam outlet of the single-effect evaporator 10 is communicated with an inlet of the condenser 11, and a liquid outlet 22 is formed in the condenser 11; the single-effect evaporator 10 is a conventional evaporator at present, which can realize distillation by means of negative pressure, and a residue outlet 1001 at the bottom of the single-effect evaporator 10 is communicated with a sludge inlet of the plate filter press 14 through a pipeline.
A liquid inlet of the recovery storage tank 13 is communicated with a liquid outlet 22 of the condenser 11 through a pipeline;
the plate-type filter press 14 and the sludge storage tank 15, the sludge inlet of the sludge storage tank 15 is communicated with the sludge outlet of the sedimentation tank 9 through a pipeline, the sludge outlet of the sludge storage tank 15 is communicated with the sludge inlet of the plate-type filter press 14, and the filtrate outlet 141 of the plate-type filter press 14 is communicated with the liquid inlet of the single-effect evaporator 10 through a filtrate return pipeline
Wherein, in order to better treat the distilled sewage, the sewage recovery treatment system further comprises a biochemical tank 12 for a contact oxidation method, and the biochemical tank 12 is arranged between a liquid inlet of the recovery storage tank 13 and a liquid outlet 22 of the condenser 11; the liquid inlet of the biochemical pool 12 is communicated with the liquid outlet 22 of the condenser 11 through a pipeline, the liquid outlet 22 of the biochemical pool 12 is communicated with the liquid inlet of the recovery storage tank 13, the bottom of the biochemical pool 12 is provided with a sludge discharge port, and the sludge discharge port is communicated with the sludge inlet of the sludge storage tank 15 through a sludge return pipeline. The condensed water is treated by a contact oxidation method, so that organic matters in the condensed water are further decomposed, and finally recycled water is cleaner.
The embodiment of the utility model also discloses a steel pipe factory sewage recovery processing method, it includes following step:
s1, recycling and collecting the sewage of the steel pipe factory, wherein the sewage can be the sewage of the steel pipe factory for acid washing and phosphating the steel pipes, and the sewage can be collected in a unified way through a sewage tank, so that the sewage is convenient to treat in a unified way.
S2, adding the sewage into an acid adding tank 1;
s3, adding a sulfuric acid solution into the acid adding tank 1 to enable the pH value in the acid adding tank 1 to be 3-4; the sulfuric acid is added to realize demulsification to decompose the organic grease, and the organic grease and the water are separated into two insoluble phases to achieve the purpose of separation;
s4, adding the sewage in the acid adding tank 1 into the alkali adding tank 2;
s5, adding sodium hydroxide solution and calcium hydroxide into the alkali adding tank 2 to maintain the pH value in the alkali adding tank 2 between 8 and 10; sodium hydroxide and calcium hydroxide are added for destabilization, so that ferrous precipitates can be formed into precipitates, calcium phosphate precipitates can be formed, and some particles in sewage can form alum floc together with the ferrous precipitates to improve the precipitation effect; wherein the calcium hydroxide can be aqueous solution or solid calcium hydroxide can be directly added.
S6, feeding the liquid in the alkali adding tank 2 into a sedimentation tank 9, and quantitatively adding PAM into the sedimentation tank 9 for sedimentation for 3-5 h; PAM can accelerate the precipitation of particles, so that the precipitation in the sedimentation tank 9 is faster and more thorough.
S7, adding the supernatant of the sedimentation tank 9 into a single-effect evaporator 10 for distillation; the sludge in the sedimentation tank 9 flows into a sludge storage tank 15; the distillation in the step S7 adopts negative pressure distillation, the pressure is controlled to be 80-90Kpa, and the distillation temperature is controlled to be 80-85 ℃.
S8, condensing the distilled gas through a condenser 11 to form condensed liquid, and enabling the condensed liquid to flow into a recovery storage tank 13 for recovery and reuse; in step S8, the condensed liquid is added to the biochemical tank 12 for contact oxidation before entering the recycling tank 13, and the obtained supernatant is sent to the recycling tank 13 for recycling.
S9, the sludge in the sludge storage tank 15 is precipitated and concentrated and then sent to a plate filter press 14 for pressure filtration to obtain a filter cake, and the filtrate flows back to the single-effect evaporator 10.
The processing system and the processing method have the advantages that: this processing system can add earlier with the sewage of collecting in the acidification tank 1, then add sulphuric acid in the acidification tank 1 and carry out the breakdown of emulsion, then sewage enters into the alkali addition tank 2, then sewage enters into sedimentation tank 9 and deposits, the supernatant is sent to single effect evaporator 10 and is evaporated, the condensate water retrieval and utilization that the condensation finally obtained, and the mud residue of sediment then sends to and stores in sludge storage tank 15 and concentrates, finally become the filter cake through 14 filter presses of plate filter press, and like this, this recovery processing device just can be convenient handle sewage, and the reclaimed water resource, pollution abatement, the zero release has really been accomplished.
The above-mentioned embodiments are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and all modifications and changes made by the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention on the basis of not departing from the spirit of the present invention.
Claims (5)
1. The utility model provides a steel pipe factory sewage recovery processing system which characterized in that: comprises that
The acid adding tank is provided with an acid adding port and a sewage adding port at the upper part and a liquid outlet at the bottom, and the acid adding port is communicated with the acid liquid storage tank through an acid adding pipeline;
the alkali adding tank is provided with an alkali adding port, a liquid inlet and a liquid outlet, and the liquid inlet of the alkali adding tank is communicated with the liquid outlet of the acid adding tank through a pipeline; the alkali adding port is communicated with the alkali liquor storage tank through an alkali adding pipeline;
the liquid inlet of the sedimentation tank is communicated with the liquid outlet of the alkali adding tank through a pipeline, the bottom of the sedimentation tank is provided with a sludge outlet, and the upper part of the sedimentation tank is provided with a supernatant outlet;
the liquid inlet of the single-effect evaporator is communicated with the supernatant outlet of the sedimentation tank through a pipeline, the steam outlet of the single-effect evaporator is communicated with the inlet of the condenser, and the condenser is provided with a liquid outlet;
the liquid inlet of the recovery storage tank is communicated with the liquid outlet of the condenser through a pipeline;
plate filter press and mud storage tank, pipeline intercommunication between the mud mouth of mud storage tank and the mud mouth of sedimentation tank, intercommunication between the mud mouth of mud storage tank and the mud mouth of plate filter press, the filtrating export of plate filter press is through filtrating return line and single effect evaporator's inlet intercommunication.
2. The steel tube mill sewage recovery processing system of claim 1, characterized in that: the sewage recovery and treatment system also comprises a biochemical tank for a contact oxidation method, wherein the biochemical tank is arranged between the liquid inlet of the recovery storage tank and the liquid outlet of the condenser; the liquid inlet of the biochemical pond is communicated with the liquid outlet of the condenser through a front pipeline, the liquid outlet of the biochemical pond is communicated with the liquid inlet of the recovery storage tank, the bottom of the biochemical pond is provided with a sludge discharge port, and the sludge discharge port is communicated with the sludge inlet of the sludge storage tank through a sludge return pipeline.
3. The steel tube mill sewage recovery processing system of claim 2, characterized in that: the bottom of the acid adding tank is also provided with a sludge outlet which is communicated with a liquid inlet of the sedimentation tank through a pipeline.
4. The steel tube mill sewage recovery processing system of claim 3, wherein: the acid adding pipeline comprises an acid adding pipeline, an acid adding metering pump and an acid adding control valve are arranged on the acid adding pipeline, the alkali adding pipeline comprises an alkali adding pipeline, and an alkali adding metering pump and an alkali adding control valve are arranged on the alkali adding pipeline.
5. The steel tube mill sewage recovery processing system of claim 4, characterized in that: and a residue outlet at the bottom of the single-effect evaporator is communicated with a sludge inlet of the plate filter press through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922482930.6U CN211445448U (en) | 2019-12-31 | 2019-12-31 | Sewage recovery processing system of steel pipe factory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922482930.6U CN211445448U (en) | 2019-12-31 | 2019-12-31 | Sewage recovery processing system of steel pipe factory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211445448U true CN211445448U (en) | 2020-09-08 |
Family
ID=72311180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922482930.6U Active CN211445448U (en) | 2019-12-31 | 2019-12-31 | Sewage recovery processing system of steel pipe factory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211445448U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110937766A (en) * | 2019-12-31 | 2020-03-31 | 张家港市清源水处理有限公司 | Steel pipe plant sewage recovery treatment system and treatment method thereof |
| CN112570653A (en) * | 2020-11-23 | 2021-03-30 | 优钢新材料科技(湖南)有限公司 | Full-wet sand treatment system for water recycling |
-
2019
- 2019-12-31 CN CN201922482930.6U patent/CN211445448U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110937766A (en) * | 2019-12-31 | 2020-03-31 | 张家港市清源水处理有限公司 | Steel pipe plant sewage recovery treatment system and treatment method thereof |
| CN112570653A (en) * | 2020-11-23 | 2021-03-30 | 优钢新材料科技(湖南)有限公司 | Full-wet sand treatment system for water recycling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017133511A1 (en) | Treatment apparatus and method for zero liquid discharge of desulfurization wastewater | |
| CN204588908U (en) | A new landfill leachate treatment system | |
| CN104176857B (en) | The treatment process of Mn-bearing waste water in wet method electrolysis manganese production process | |
| CN101555053A (en) | Compound coagulant used for treating rare-earth highly concentrated ammonian wastewater to recover industry ammonium chloride and treatment method | |
| CN102260006A (en) | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid | |
| CN205773874U (en) | A kind of Novel desulphurization waste water zero discharge device | |
| CN103657122A (en) | Sextuple-effect evaporation device | |
| CN113292187A (en) | Resourceful treatment method and device for high-concentration ammonia nitrogen wastewater | |
| CN211445448U (en) | Sewage recovery processing system of steel pipe factory | |
| CN203591603U (en) | Sextuple-effect evaporator | |
| CN113772884B (en) | Coking wastewater treatment system and method | |
| CN111453891A (en) | Evaporation concentration recycling zero discharge system for phosphating wastewater treatment | |
| CN206940653U (en) | Desulphurization for Coal-fired Power Plant waste water zero discharge device | |
| CN205241427U (en) | Desulfurization wastewater treatment system | |
| CN102010082A (en) | Treatment method for recycling waste dilute sulfuric acid | |
| CN204588901U (en) | A landfill leachate treatment system | |
| CN102153218B (en) | Device and process for treating chromate waste water | |
| CN218665656U (en) | System for recycling materialized heavy metal sewage of dangerous waste plant | |
| CN107151072B (en) | Treatment process of desulfurization wastewater | |
| CN103663777A (en) | Method for treating hydrofluoric acid-containing wastewater of factory | |
| CN212198888U (en) | Desulfurization waste water concentration decrement device based on film evaporation technique | |
| CN107399863B (en) | Combined treatment system and method for boiler chemical cleaning wastewater and air preheater flushing water | |
| CN110937766A (en) | Steel pipe plant sewage recovery treatment system and treatment method thereof | |
| CN110818168A (en) | Smoke washing wastewater zero-discharge technical treatment system and method | |
| CN204079640U (en) | Acid-washing stainless steel line generalization Waste Water Treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |