CN220183029U - Device for continuously treating feces and synchronously producing microalgae - Google Patents
Device for continuously treating feces and synchronously producing microalgae Download PDFInfo
- Publication number
- CN220183029U CN220183029U CN202321630072.5U CN202321630072U CN220183029U CN 220183029 U CN220183029 U CN 220183029U CN 202321630072 U CN202321630072 U CN 202321630072U CN 220183029 U CN220183029 U CN 220183029U
- Authority
- CN
- China
- Prior art keywords
- reaction tank
- pipeline
- continuously treating
- fecal sewage
- producing microalgae
- 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
- 210000003608 fece Anatomy 0.000 title abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 66
- 239000010865 sewage Substances 0.000 claims abstract description 21
- 239000012528 membrane Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 14
- 230000002550 fecal effect Effects 0.000 claims description 17
- 238000005273 aeration Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012510 hollow fiber Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 241000195493 Cryptophyta Species 0.000 description 12
- 241000894006 Bacteria Species 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000002028 Biomass Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 244000144972 livestock Species 0.000 description 3
- 239000010871 livestock manure Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 244000144977 poultry Species 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000195649 Chlorella <Chlorellales> Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000223785 Paramecium Species 0.000 description 1
- 241000700141 Rotifera Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a device for continuously treating feces and sewage to synchronously produce microalgae, which comprises a plurality of reaction tanks and a plurality of pipeline reactors arranged between adjacent reaction tanks at intervals, wherein the reaction tanks are communicated with the downstream pipeline reactors through a conveying pump, and the outlet of the pipeline reactors is communicated with the downstream reaction tanks through communicating pipes; a biogas slurry adding pipeline is arranged on the first reaction tank, and microalgae seeds are inoculated in the first reaction tank; an ultrafiltration membrane component is arranged in the last reaction tank, a suction pump is arranged outside the reaction tank, and a water inlet of the suction pump is communicated with a water outlet of the ultrafiltration membrane component.
Description
Technical Field
The utility model belongs to the field of wastewater treatment, and particularly relates to a device for continuously treating feces and synchronously producing microalgae.
Background
Livestock and poultry manure is a high-pollution organic wastewater and is a main cause of agricultural non-point source pollution.At present, the process flow of livestock and poultry manure treatment is generally anaerobic fermentation to produce methane, multistage aerobic nitrogen and phosphorus removal, flocculant decolorization and the like. The anaerobic biogas engineering technology in the technology is relatively mature, and the construction mode can also adopt a vertical stirring tank or a black film biogas digester according to specific treatment capacity. The anaerobic process can decompose most organic matters, carbon elements are converted into methane and carbon dioxide, the chemical oxygen demand in anaerobic liquid, namely biogas slurry, is generally 5000-20000mg/L, the total nitrogen is about 5000mg/L, and the total phosphorus is about 500 mg/L. After multistage aerobic denitrification and dephosphorization are carried out on biogas slurry and decoloration is carried out on the biogas slurry by a flocculating agent, the effluent can meet the standard of farmland irrigation. However, the multistage aerobic process has high energy consumption, and the flocculant adopted is mainly polyaluminium chloride and polyacrylamide and is a compound with certain toxicity. More importantly, the C, N element in the biogas slurry is converted into CO in the multistage aerobic process 2 、N 2 Released into the air, there is therefore a need to develop new fecal sewage treatment processes and equipment.
Microalgae are a type of photoautotrophic microorganisms, and can be mutually and symbiotic with bacteria to rapidly remove pollutants in organic wastewater. The technology is characterized in that the bacteria in the symbiotic system aerobically grow and metabolize organic matters to release carbon dioxide, microalgae utilizes light energy to fix carbon dioxide to absorb nitrogen and phosphorus and the like to synthesize microalgae biomass, and the microalgae biomass can be widely applied to the fields of aquatic products, agriculture and the like after being harvested. Compared with the traditional multistage aerobic and flocculation precipitation, the process realizes the recycling of elements. The efficient algae pond is the earliest equipment for treating urban sewage based on algae biotechnology, and has two basic shapes, namely a runway pond and a central driving shaft pond. The algae bacteria circularly flow under the driving of the stirring paddles, microalgae are collected by adopting a disc centrifuge after the water quality discharge standard is met, and tail water can be discharged after reaching the standard. The efficient algae pond has large occupied area and different liquid depths, the functions of algae and bacteria are not fully exerted, and the efficient algae pond is seriously influenced by external temperature, rainwater and other climatic conditions.
Disclosure of Invention
The utility model aims to solve the problems of large occupied area and unstable process of the traditional fecal sewage treatment facility, and provides a device which can amplify and fully play the functions of continuously treating the fecal sewage and synchronously producing microalgae.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the device for continuously treating the fecal sewage and synchronously producing the microalgae comprises a plurality of reaction tanks and a plurality of pipeline reactors which are arranged between adjacent reaction tanks at intervals, wherein the reaction tanks are communicated with the downstream pipeline reactors through a conveying pump, and the outlet of each pipeline reactor is communicated with the downstream reaction tanks through a communicating pipe; a biogas slurry adding pipeline is arranged on the first reaction tank, and microalgae seeds are inoculated in the first reaction tank; an ultrafiltration membrane component is arranged in the last reaction tank, a suction pump is arranged outside the reaction tank, and a water inlet of the suction pump is communicated with a water outlet of the ultrafiltration membrane component.
Further, the bottoms of the reactors are provided with aeration pipes; a plurality of aeration holes are arranged on the aeration pipe, and one end of the aeration pipe is communicated with an aeration device arranged outside the reaction tank.
Further, the pipeline reactor is formed by sequentially connecting a plurality of transparent horizontal pipelines.
Further, the upper parts of the reaction tanks are provided with filter screen frames; the filter screen frame suit is in the play water end outside of communicating pipe, the play water end outside of natural pond liquid interpolation pipeline.
Further, the mesh diameter of the filter screen frame is 5-10 micrometers.
Further, a temperature control pipeline is coiled on the inner wall of the reaction tank; one end of the temperature control pipeline is used for external cold source or heat source fluid communication, and the other end extends out of the reaction tank.
Further, a stirring assembly is arranged in the reaction tank and is driven to rotate by a motor positioned outside the reaction tank.
Further, the ultrafiltration membrane component is a hollow fiber curtain type membrane.
Further, an illuminating lamp is arranged above the reaction tank and 50 to 150cm away from the liquid level.
Further, the reaction tank and the outer cover of the pipeline type reactor are provided with arch sheds made of plastic films; PVC lattice mesh cloth is paved in the reaction tank.
The utility model has the beneficial effects that:
the utility model adopts the reaction tank to be connected with the horizontal pipeline reactor for algae cultivation in series, and adjusts the light-dark period of the fecal sewage according to the flow rate, thereby fully exerting the respective sewage removing performance of algae and bacteria; an ultrafiltration membrane component with a certain area is placed in the last reaction tank in series, the ultrafiltration membrane component can be in the form of a flat membrane or a hollow fiber curtain membrane, and effluent reaching the standard is filtered out in the step, so that the aim of concentrating microalgae biomass can be fulfilled; the concentrated microalgae cells are output to the outside of the reaction tank, can be directly filled as aquatic bait, and can be subjected to spray drying after being concentrated again by a disc centrifuge to obtain algae powder.
Drawings
FIG. 1 is a schematic diagram of the overall mechanism of the present utility model;
FIG. 2 is a schematic view of the external structure of the reaction tank of the present utility model;
reference numerals: 1. a reaction tank; 2. an aeration pipe; 3. a filter screen frame; 4. a biogas slurry addition pipe; 5. a temperature control pipe; 6. a transfer pump; 7. a pipeline reactor; 8. a communicating pipe; 9. an ultrafiltration membrane module; 10. a motor; 11. and a suction pump.
Description of the embodiments
The technical solution of the present utility model will be further described with reference to the drawings and examples, so that those skilled in the art can more clearly understand the contents of the technical solution.
The device for continuously treating the feces and synchronously producing the microalgae in the embodiment comprises 10 groups of reaction tanks 1 and 9 groups of pipeline reactors 7 which are arranged between the adjacent reaction tanks 1 at intervals. The reaction tank can be a round tank or a square tank, and particularly a round tank is adopted in the embodiment, and the diameter of the reaction tank is 5 meters; the material is a steel pipe bracket and PVC grid cloth which are used as inner liners, the water depth in the pond is 1 meter, and the total culture volume of each pond is 20 tons. The pipeline reactor 7 in the embodiment is formed by sequentially connecting a plurality of transparent horizontal pipelines. The length of the horizontal pipeline is 4 meters, the diameter of the pipeline is 10 layers, the diameter of the pipeline is 110mm, and the total volume of the monomer pipeline is 0.8 ton.
A biogas slurry adding pipeline 4 is arranged on the first reaction tank 1, and microalgae seeds are inoculated in the biogas slurry adding pipeline; the reaction tank 1 is communicated with the downstream pipeline reactor 7 through a delivery pump 6, and the outlet of the pipeline reactor 7 is communicated with the downstream reaction tank 1 through a communicating pipe 8. The upper parts of the reaction tanks 1 are provided with filter screen frames 3; the filter screen frame 3 is respectively sleeved outside the biogas slurry adding pipeline 4 or the communicating pipe 8. The mesh diameter of the filter screen frame 3 is 5-10 micrometers. The effect is to remove protozoa such as rotifer and paramecium which may exist in the biogas slurry, and avoid eating microalgae cells by protozoa in large quantity.
An ultrafiltration membrane component 9 is arranged in the last reaction tank 1, a suction pump 11 is arranged outside the reaction tank, and a water inlet of the suction pump is connected with a water outlet of the ultrafiltration membrane component. The ultrafiltration membrane component 9 is a hollow fiber curtain type membrane, and is deposited at the bottom of the tank, and the highest point is not higher than 50cm.
The bottom of the reactor is provided with aeration pipes 2; a plurality of aeration holes with the aperture of 30 mu m are arranged on the aeration pipe 2; and one end of the aeration pipe 2 is communicated with an aeration device arranged outside the reaction tank 1.
A temperature control pipeline 5 is coiled on the inner wall of the reaction tank 1; one end of the temperature control pipeline 5 is used for external cold source or heat source fluid communication, and the other end extends out of the reaction tank 1. The temperature control pipeline is used for heating in winter and cooling in summer so as to regulate and control the temperature in the reaction tank.
The reaction tank 1 is internally provided with a stirring assembly which is driven to rotate by a motor 10 positioned outside the reaction tank 1. The stirring component is a common structure in microalgae culture in the prior art.
An illuminating lamp is arranged above the reaction tank 1 and 50 to 150cm away from the liquid level. The reaction tank 1 and the pipeline reactor 7 are covered with a plastic film arch shed.
The specific operation of this embodiment includes the following steps:
(1) Adding biogas slurry into the first reaction tank according to the proportion of 10-50% of the height of the ruler body, inoculating chlorella according to the proportion of 5%, and supplementing the tank with clear water, wherein the depth of the tank is less than 1 meter;
(2) Under natural illumination in daytime, the ceiling lamp is used for supplementing light at night, the light intensity is 100 light quantum density, the ventilation ratio of vertical mixing is 0.1, and the rotation speed of tangentially mixed plastics is 10-50 r/min; after microalgae are propagated, sequentially adding original biogas slurry, and propagating to a subsequent pipeline reactor and a circular pool, wherein the total volume after all propagation is 208 tons;
(3) According to the efficiency of removing the fecal sewage by the algae, the residence time of the original fecal sewage in the equipment is about 10 days; removing pollutants from algae and bacteria, and then treating the algae and bacteria by MBR, wherein the treatment capacity of the fecal sewage per mu is 20.8 tons/d; the pollution load of the effluent meets the emission standard of livestock and poultry manure pollutants, namely COD is lower than 300mg/L, ammonia nitrogen is lower than 80/L, and total phosphorus is lower than 8mg/L.
(4) The sewage is continuously treated, and about 1 kg of microalgae biomass can be obtained after each 1 ton of wastewater is treated.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. The utility model provides a device of synchronous production microalgae of continuous processing excrement, includes a plurality of reaction tank (1) to and a plurality of pipeline formula reactor (7) that the interval set up between adjacent reaction tank (1), its characterized in that: the reaction tank (1) is communicated with the downstream pipeline type reactor (7) through a conveying pump (6), and the outlet of the pipeline type reactor (7) is communicated with the downstream reaction tank (1) through a communicating pipe (8); a biogas slurry adding pipeline (4) is arranged on the first reaction tank (1), and microalgae seeds are inoculated in the first reaction tank; an ultrafiltration membrane component (9) is arranged in the last reaction tank (1), a suction pump (11) is arranged outside the reaction tank (1), and a water inlet of the suction pump (11) is communicated with a water outlet of the ultrafiltration membrane component (9).
2. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: aeration pipes (2) are arranged at the bottoms of the reactors; a plurality of aeration holes are formed in the aeration pipe (2), and one end of the aeration pipe (2) is communicated with an aeration device arranged outside the reaction tank (1).
3. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: the pipeline reactor (7) is formed by sequentially connecting a plurality of transparent horizontal pipelines.
4. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: the upper parts of the reaction tanks (1) are provided with filter screen frames (3); the filter screen frame (3) is sleeved outside the water outlet end of the communicating pipe (8) and outside the water outlet end of the biogas slurry adding pipeline (4).
5. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 4, wherein: the mesh diameter of the filter screen frame (3) is 5-10 micrometers.
6. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: a temperature control pipeline (5) is coiled on the inner wall of the reaction tank (1); one end of the temperature control pipeline (5) is used for external cold source or heat source fluid communication, and the other end extends out of the reaction tank (1).
7. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: the inside of reaction tank (1) is provided with stirring subassembly, and this stirring subassembly is by being located motor (10) drive rotation outside reaction tank (1).
8. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: the ultrafiltration membrane component (9) is a hollow fiber curtain type membrane.
9. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: an illuminating lamp is arranged above the reaction tank (1) and 50 to 150cm away from the liquid level.
10. The apparatus for continuously treating fecal sewage and synchronously producing microalgae according to claim 1, wherein: the reaction tank (1) and the pipeline reactor (7) are covered with a arched shed made of plastic films; PVC lattice mesh cloth is paved in the reaction tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630072.5U CN220183029U (en) | 2023-06-26 | 2023-06-26 | Device for continuously treating feces and synchronously producing microalgae |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321630072.5U CN220183029U (en) | 2023-06-26 | 2023-06-26 | Device for continuously treating feces and synchronously producing microalgae |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220183029U true CN220183029U (en) | 2023-12-15 |
Family
ID=89109291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321630072.5U Active CN220183029U (en) | 2023-06-26 | 2023-06-26 | Device for continuously treating feces and synchronously producing microalgae |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220183029U (en) |
-
2023
- 2023-06-26 CN CN202321630072.5U patent/CN220183029U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108975614B (en) | Operation method of biogas slurry ecological treatment culture system | |
| CN101492230B (en) | Comprehensive processing process and system for cultivation wastewater | |
| CN2883355Y (en) | Sewage treatment and ultilization Ecological pool | |
| CN101759323B (en) | Treatment combined process for pig farm waste water with high nitrogen content | |
| CN106277646B (en) | System for synchronously purifying biogas slurry and raw biogas by utilizing algal-bacteria symbiont | |
| CN103910434B (en) | To exceed standard the membrane type bioreactor of nitrogen phosphorus and treatment process thereof for the treatment of natural pond liquid | |
| CN109160669B (en) | Operation method of biogas slurry light treatment breeding system | |
| CN106219871A (en) | A kind of livestock breeding wastewater processing method | |
| CN106430820B (en) | A kind of biological treatment device and its technique of high ammonia nitrogen pig raising biogas slurry | |
| CN103274527B (en) | Continuous system for treating organic wastewater by using microalgae | |
| CN208776519U (en) | A kind of artificial swamp multistage reinforcing pool sewage disposal system | |
| CN115108688B (en) | Comprehensive treatment system and method for white spirit production wastewater | |
| CN110407404A (en) | A kind of production method and system converting nutrients in agricultural effluent to crude protein raw material | |
| CN106186339A (en) | A kind of stain disease processing method with granule immobilization cell as core | |
| CN108946950A (en) | A kind of multifunction manual chinampa water purification system | |
| CN112919641A (en) | Method for removing nitrogen and phosphorus by using microalgae and treatment device | |
| CN104961289A (en) | Micro-nano aeration high-efficiency biotreatment technical system for livestock and poultry breeding wastewater | |
| CN105601025A (en) | Culture wastewater efficient degrading and denitrifying treatment system and treatment method thereof | |
| CN107177507A (en) | A kind of method for cultivating high-density suspended floading condition helotism body | |
| CN213865564U (en) | Utilize device of algae fungus biomembrane nitrogen and phosphorus removal | |
| CN101671103A (en) | Contact type tubificidae sludge decrement reactor and application thereof | |
| CN219752089U (en) | Resource continuous treatment system for purifying biogas slurry based on energy chlorella | |
| CN1821123A (en) | Device and method for anaerobic treating waste water and method of propagating active granular bacteria strain at normal termperature | |
| CN205907135U (en) | Natural pond liquid effluent disposal system | |
| CN104671411A (en) | PABR (periodic anaerobic baffled reactor)-MABR (membrane aerated biofilm reactor) coupling technology method and equipment for treating livestock breeding wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |