CN207276432U - A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus - Google Patents
A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus Download PDFInfo
- Publication number
- CN207276432U CN207276432U CN201721241549.5U CN201721241549U CN207276432U CN 207276432 U CN207276432 U CN 207276432U CN 201721241549 U CN201721241549 U CN 201721241549U CN 207276432 U CN207276432 U CN 207276432U
- Authority
- CN
- China
- Prior art keywords
- sludge
- treatment plant
- phosphorus
- pipeline
- sewage
- 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
Abstract
The utility model provides a kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus, including biological reaction pool, sedimentation basin, sludge disintegration tank, sludge dehydration device, MAP reactors, one end of the biological reaction pool is connected by pipeline with water inlet, the other end is connected by pipeline with the sedimentation basin, the sedimentation basin by pipeline respectively with water outlet, sludge disintegration tank, sludge dehydration device is connected, the sludge disintegration tank passes through pipeline and the sludge dehydration device respectively, MAP reactors are connected, the MAP reactors are connected by pipeline with the biological reaction pool.Mud decrement described in the utility model and the synchronous sewage-treatment plant for receiving phosphorus are using ferrate solution oxidation breaking sludge, intracellular organic substance and nitrogen phosphorus are discharged, mud decrement is not only realized, improves removal effect of the system to nitrogen phosphorus, also achieves the recycling of sewage, sludge.
Description
Technical field
The utility model belongs to sewage, sludge technology field, more particularly, to a kind of mud decrement and the synchronous dirt for receiving phosphorus
Water treatment facilities.
Background technology
Activated sludge process is a kind of important method of Sewage Biological Treatment, it can effectively remove the pollutant in water removal
Matter, the sewage treatment plant applied to the whole world about 90%, but the maximum drawback of the method is exactly to produce a large amount of excess sludges.With
Exemplified by China, the wet mud amount that urban wastewater treatment firm in 2010 produces is about 20,000,000 tons, is surpassed to wet mud yield in 2015
Cross 45,000,000 tons (80% moisture content).But current specific resistance to filtration rate is generally relatively low, its harmless treatment reaches 30% or so,
The sludge for still having 70% or so is not dealt carefully with and is disposed.Since sludge components are complicated, and contain heavy metal ion, parasitism
Worm and pathogen etc., it, which is handled, mishandling can trigger serious secondary pollution.It can be seen from the above that current China specific resistance to filtration
Situation very severe.In this context, domestic and foreign scholars use enhancement microbiological recessive growth technology, by sludge lysis,
Intracellular organic substance is discharged, matrix of the biochemical reaction tank as microorganism recessive growth is back to, so as to fulfill sludge
Decrement.But in sludge process of lysis, intracellular nitrogen phosphorus substance can also discharge therewith, and longtime running can increase system and take off
The burden of nitrogen dephosphorization, causes the removal effect reduction to nitrogen phosphorus, especially the removal effect of phosphorus is decreased obviously.It is it is well known that living
Property sludge system in the removal of phosphorus mainly realize that and the reduction of sludge discharge causes phosphorus in system by the discharge of excess sludge
Middle accumulation, so as to cause phosphor-removing effect to be deteriorated.For this reason, domestic and international researcher more removes phosphorus to improve using chemical dephosphorization technology
Remove, but the technology is both needed to set chemical dephosphorization technique, adds a large amount of chemical agents, adds the expense of system dephosphorization.The opposing party
Face, it is contemplated that P elements belong to non-renewable resources in itself, and the global phosphate rock resource for exploitation is it is predicted that can only maintain 100 years
Left and right, and the phosphorus in nature after use final about 80% with sewage discharge, and the phosphorus in sewage by way of sludge from
Removed in water.It can be considered to, by after sludge lysis, the phosphorus in supernatant be recycled, a side during mud decrement
The burden that face reduces system dephosphorization ensures effluent quality, on the other hand also achieves recycling and the recycling of phosphorus.
Ferrate is a kind of strong oxidizer, its oxidation-reduction potential is 2.20V under acid condition, higher than ozone, therefore
It can effective oxygenolysis sludge, discharge intracellular organic matter.The reduction product Fe (III) of ferrate is flocculant, can be changed
The settling property of kind sludge, and non-secondary pollution.It can be considered to come breaking sludge, can not only be reached good using ferrate
Good lysis effect, and catabolite also has raising dehydration property and dephosphorization function.In practical application, it is contemplated that ferric acid
Salting liquid preparation process is simple, and cost is relatively low, and wherein contains Fe (VI), hypochlorite and lye, can greatly promote sludge
Disintegration effect.Therefore, the present invention carries out sludge lysis decrement, greatly reduces medicine using ferrate solution come breaking sludge
Agent manufacturing cost, has saved investment.In order to improve system phosphor-removing effect, using struvite crystallization technology on the sludge after cracking
Phosphorus in clear liquid is recycled, since guanite is phosphorus sustained release agent, so as to furthermore achieved that the recycling of sludge.
The content of the invention
In view of this, the utility model is directed to a kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus, net
While changing sewage, excess sludge production is effectively reduced, and recycles the nitrogen phosphorus substance in sludge, realizes the recycling of sludge
Utilize, and reduce follow-up Treatment of Sludge and disposal costs, available for industry and municipal sewage plant's (station).
To reach above-mentioned purpose, what the technical solution of the utility model was realized in：
A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus, including biological reaction pool, sedimentation basin, sludge disintegration
Tank, sludge dehydration device, MAP reactors, one end of the biological reaction pool are connected by pipeline with water inlet, and the other end leads to
Pipeline is crossed with the sedimentation basin to be connected, the sedimentation basin by pipeline respectively with water outlet, sludge disintegration tank, sludge dewatering
Device is connected, and the sludge disintegration tank is connected by pipeline with the sludge dehydration device, MAP reactors respectively, described
MAP reactors be connected by pipeline with the biological reaction pool.
Further, the mud decrement and the synchronous sewage-treatment plant for receiving phosphorus are additionally provided with ferrate solution generation
Tank, ferrate solution generation tank are connected by pipeline with the sludge disintegration tank.
Further, the mud decrement and the synchronous sewage-treatment plant for receiving phosphorus are additionally provided with return line, described
One end of return line is connected with the outlet of sedimentation basin, and the other end is connected with the entrance of the biological reaction pool.
Further, the sludge disintegration tank is provided with some dipper crowding gears, and the dipper crowding gear is vertically arranged, institute
The dipper crowding gear stated includes cylinder, connecting rod, push plate, and the cylinder is connected by connecting rod with the push plate, institute
The push plate stated is located at the bottom of the sludge disintegration tank.
Further, the sludge dehydration device is equipped with import and outlet, and the inside of the sludge dehydration device is set
Sludge bag, suction pump, drinking-water pipe are equipped with, one end of the sludge bag is connected with the import, the other end and drinking-water pipe phase
Even, the drinking-water pipe is connected with the suction pump, and the suction pump is connected with the outlet.
Further, the interface that draws water is provided between the sludge bag and drinking-water pipe, the inside of the interface that draws water is set
It is equipped with filter screen.
Further, the sludge bag is internally provided with some spin, and the outside diameter of the spin is more than described
The internal diameter of the filter hole of filter screen.
Relative to the prior art, mud decrement described in the utility model and the synchronous sewage-treatment plant for receiving phosphorus have with
Lower advantage：
(1) mud decrement described in the utility model and the synchronous sewage-treatment plant for receiving phosphorus use ferrate solution oxygen
Change breaking sludge, intracellular organic substance and nitrogen phosphorus are discharged, the phosphorus and ammonia nitrogen discharged using bypass MAP reactors to lysis is carried out
Recycling, and the supernatant that will be enriched in organic matter is back to biological reaction pool and supplies microorganism recessive growth, not only realizes sludge and subtracts
Amount, improves removal effect of the system to nitrogen phosphorus, also achieves the recycling of sewage, sludge.
(2) residue that mud decrement described in the utility model and the synchronous sewage-treatment plant for receiving phosphorus discharge secondary settling tank
Sludge introduces sludge disintegration tank, is reacted with the ferrate solution of input, after ferrate solution cracks, partial sludge cell
Rupture, intracellular organic matter dissolution, causes organic matter, nitrogen, phosphorus equal size to increase considerably, and the supernatant after cracking introduces MAP
Reactor, recovery of nitrogen and phosphorus is carried out using the method for crystallization guanite；It will be enriched in organic matter supernatant and be back to biochemical reactor confession
Microorganism recessive growth；In sludge disintegration tank, Fe (VI) degraded productions are contained in the excess sludge after ferrate solution cracks
Raw Fe3+, therefore the dewatering increase of the sludge, under the conditions of it or a little sludge conditioner need not be added, can directly it carry out
Follow-up dehydration.
Brief description of the drawings
The attached drawing for forming the part of the utility model is used to provide a further understanding of the present invention, this practicality is new
The schematic description and description of type is used to explain the utility model, does not form the improper restriction to the utility model.
In attached drawing：
Fig. 1 is the schematic diagram of the mud decrement and the synchronous sewage-treatment plant for receiving phosphorus described in the utility model embodiment；
Fig. 2 is the technological process of the mud decrement and the synchronous sewage-treatment plant for receiving phosphorus described in the utility model embodiment
Figure；
Fig. 3 is the schematic diagram of the sludge disintegration tank described in the utility model embodiment；
Fig. 4 is the schematic diagram of the sludge dehydration device described in the utility model embodiment.
Description of reference numerals：
1- biological reaction pools；2- sedimentation basins；3- sludge disintegration tanks；4- sludge dehydration devices；5-MAP reactors；6- is intake
Mouthful；7- water outlets；21- return lines；31- ferrate solutions generate tank；32- dipper crowding gears；321- cylinders；322- connections
Bar；323- push plate；41- imports；42- is exported；43- sludge bags；431- spin；432- draws water interface；433- filter screens；44-
Suction pump；45- drinking-water pipes.
Embodiment
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figs 1-4, a kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus, including biological reaction pool 1, precipitation
Pond 2, sludge disintegration tank 3, sludge dehydration device 4, MAP reactors 5, one end of the biological reaction pool 1 by pipeline with into
The mouth of a river 6 be connected, the other end is connected by pipeline with the sedimentation basin 2, the sedimentation basin 2 by pipeline respectively with water outlet
7th, sludge disintegration tank 3, sludge dehydration device 4 are connected, and the sludge disintegration tank 3 passes through pipeline and the sludge dewatering respectively
Device 4, MAP reactors 5 are connected, and the MAP reactors 5 are connected by pipeline with the biological reaction pool 1.
The excess sludge of the 50-100% flowed out from sedimentation basin 2 enters sludge disintegration tank 3, and the excess sludge of 0-50% enters
Sludge dehydration device 4, specific surplus sludge volume can adjust according to actual conditions.
The mud decrement and the synchronous sewage-treatment plant for receiving phosphorus are additionally provided with ferrate solution generation tank 31, institute
The ferrate solution generation tank 31 stated is connected by pipeline with the sludge disintegration tank 3.
The mud decrement and the synchronous sewage-treatment plant for receiving phosphorus are additionally provided with return line 21, the return duct
The one end on road 21 is connected with the outlet 42 of sedimentation basin 2, and the other end is connected with the entrance of the biological reaction pool 1.
The sludge disintegration tank 3 is provided with some dipper crowding gears 32, and the dipper crowding gear 32 is vertically arranged, described
Dipper crowding gear 32 include cylinder 321, connecting rod 322, push plate 323, the cylinder 321 by connecting rod 322 with it is described
Push plate 323 be connected, the push plate 323 is located at the bottom of the sludge disintegration tank 3.Push plate 323 to sludge into
Row pressing, makes sludge disintegration.
The sludge dehydration device 4 is equipped with import 41 and outlet 42, and the inside of the sludge dehydration device 4 is set
Have sludge bag 43, suction pump 44, drinking-water pipe 45, one end of the sludge bag 43 is connected with the import 41, the other end with
Drinking-water pipe 45 is connected, and the drinking-water pipe 45 is connected with the suction pump 44, the suction pump 44 and the outlet 42
It is connected.
The interface 432 that draws water, the inside of the interface 432 that draws water are provided between the sludge bag 43 and drinking-water pipe 45
It is provided with filter screen 433.
The sludge bag 43 is internally provided with some spin 431, and the outside diameter of the spin 431 is more than described
The internal diameter of the filter hole of filter screen 433.Spin 431 is stirred internal sludge, is filtered easy to filter screen 433.
The biological reaction pool 1 includes anaerobic pond, anoxic pond, aerobic tank.
The mud decrement significant effect of the sewage-treatment plant, be 30~55%, reduce follow-up Treatment of Sludge with
Disposal costs, and the Fe3+ for reacting generation promotes sludge dewatering, reduces the conditioner that sludge dewatering need to add, and further saves
Reagent cost is saved；
Recovery of nitrogen and phosphorus is carried out to the sludge supernatant after cracking using struvite crystallization technology, avoids phosphorus in systems
Accumulation, not only realizes the recycling of phosphor resource, but also improve removal effect of the system to phosphorus；And it will be enriched in the upper of organic carbon source
Clear liquid is back to biochemical reaction tank, organic carbon source can be used as to promote denitrification denitrogenation, improve the removal effect to nitrogen.
The sewage-treatment plant can also use ozone, Fenton reagent, ultrasonic disintegration, microwave the technical substitution such as crack
Ferrate solution carries out mud decrement and recovery of nitrogen and phosphorus, realizes the recycling of sewage, sludge.
Embodiment 1
The sewage-treatment plant used has denitrification functions for the A/O activated sludge process of laboratory scale.Flow of inlet water
For 48L/d, sludge concentration 4800mg/L.Raw water quality is：COD is 210~240mg/L, and TN is 29~33mg/L, TP 3~
3.5mg/L.Raw water initially enters anoxic pond, which is 2.1h；Anoxic pond water outlet enters aerobic tank, aerobic tank
Hydraulic detention time is 6.3h；Aerobic tank water outlet enters sedimentation basin 2, sedimentation time 3.44h, and has the part aerobic tank water outlet straight
Take back the nitrate electron acceptor flowing to needed for anoxic pond supplement denitrification, nitrate recirculation ratio 200%；The sludge one of sedimentation basin 2
Anoxic pond is partly refluxed to, another part is discharged as excess sludge.In experimentation, first conventionally operation 60 is heaven-made
For check experiment, the excess sludge ferrate that the addition present invention designs afterwards cracks and MAP recovery of nitrogen and phosphorus systems, by 50%
Excess sludge cracks, and continues continuous operation 60 days, measures two operation phase Inlet and outlet water COD, TN, NH respectively4-N, the index such as TP.
The mud decrement and the sludge yield of the synchronous sewage-treatment plant for receiving phosphorus reduce 42.3% than traditional handicraft, sludge supernatant
The rate of recovery of phosphorus is 82% in liquid, and new process is to COD, TN, NH4-N, the removal effect of TP significantly improves.
Embodiment 2：
Sewage-treatment plant uses A as different from Example 12O techniques.Flow of inlet water is 48L/d, and raw water quality is：
COD is 256.57mg/L, TN 33.94mg/L, TP 3.55mg/L.Raw water sequentially enter anaerobic pond, anoxic pond, aerobic tank and
The hydraulic detention time of sedimentation basin 2, anaerobic pond and anoxic pond is 2.1h, sludge concentration 4500mg/L, and aerobic tank waterpower stops
It is 6.3h to stay the time, sludge concentration 4500mg/L, and sludge stops 3.44h in sedimentation basin 2, a part of dirt in sedimentation basin 2
Mud is back to anaerobic pond, and return sludge ratio 100%, excess sludge directly discharges.The nitrate recirculation ratio of the system is 200%.Should
After system run all right, first according to traditional A2The continuous operation of O techniques 60 days, as a control test；Present invention design is added afterwards
Excess sludge ferrate crack and MAP recovery of nitrogen and phosphorus systems, 75% excess sludge is cracked, continues continuous operation 60
My god, measure runs two stages Inlet and outlet water COD, TN, NH respectively4-N, the index such as TP.The mud decrement and synchronization receives phosphorus
The sludge yield of sewage-treatment plant reduces 51.2% than traditional handicraft, and the rate of recovery of phosphorus is 88% in sludge supernatant, new work
Skill is to TN, NH4-N, the removal effect of TP significantly improves.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on, should be included in the utility model
Protection domain within.
Claims (7)
1. a kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：Including biological reaction pool, sedimentation basin,
Sludge disintegration tank, sludge dehydration device, MAP reactors, one end of the biological reaction pool are connected by pipeline with water inlet,
The other end is connected by pipeline with the sedimentation basin, the sedimentation basin by pipeline respectively with water outlet, sludge disintegration tank,
Sludge dehydration device is connected, and the sludge disintegration tank passes through pipeline and the sludge dehydration device, MAP reactor phases respectively
Even, the MAP reactors are connected by pipeline with the biological reaction pool.
2. mud decrement according to claim 1 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
Mud is reduced and the synchronous sewage-treatment plant for receiving phosphorus is additionally provided with ferrate solution generation tank, ferrate solution life
It is connected into tank by pipeline with the sludge disintegration tank.
3. mud decrement according to claim 1 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
Mud is reduced and the synchronous sewage-treatment plant for receiving phosphorus is additionally provided with return line, one end of the return line and sedimentation basin
Outlet is connected, and the other end is connected with the entrance of the biological reaction pool.
4. mud decrement according to claim 1 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
Mud cracks tank and is provided with some dipper crowding gears, and the dipper crowding gear is vertically arranged, and the dipper crowding gear includes cylinder, connects
Extension bar, push plate, the cylinder are connected by connecting rod with the push plate, and the push plate is located at the sludge
Crack the bottom of tank.
5. mud decrement according to claim 1 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
Mud dehydration device is equipped with import and outlet, and the sludge dehydration device is internally provided with sludge bag, suction pump, draws water
Pipe, one end of the sludge bag is connected with the import, and the other end is connected with drinking-water pipe, the drinking-water pipe and described
Suction pump is connected, and the suction pump is connected with the outlet.
6. mud decrement according to claim 5 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
The interface that draws water is provided between mud bag and drinking-water pipe, the interface that draws water is internally provided with filter screen.
7. mud decrement according to claim 6 and the synchronous sewage-treatment plant for receiving phosphorus, it is characterised in that：The dirt
Mud bag is internally provided with some spin, and the outside diameter of the spin is more than the internal diameter of the filter hole of the filter screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721241549.5U CN207276432U (en) | 2017-09-26 | 2017-09-26 | A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721241549.5U CN207276432U (en) | 2017-09-26 | 2017-09-26 | A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207276432U true CN207276432U (en) | 2018-04-27 |
Family
ID=61982000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721241549.5U Active CN207276432U (en) | 2017-09-26 | 2017-09-26 | A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207276432U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110040850A (en) * | 2019-04-30 | 2019-07-23 | 广州市广环环保科技有限公司 | A kind of A/A/O, MAP combination treatment method of kitchen waste water |
| CN111995046A (en) * | 2020-08-26 | 2020-11-27 | 成都湛蓝未来环保科技有限公司 | Activated sludge and preparation method and application thereof |
| CN114230115A (en) * | 2021-12-27 | 2022-03-25 | 东莞理工学院 | Efficient sludge conditioner and preparation method and application thereof |
-
2017
- 2017-09-26 CN CN201721241549.5U patent/CN207276432U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110040850A (en) * | 2019-04-30 | 2019-07-23 | 广州市广环环保科技有限公司 | A kind of A/A/O, MAP combination treatment method of kitchen waste water |
| CN111995046A (en) * | 2020-08-26 | 2020-11-27 | 成都湛蓝未来环保科技有限公司 | Activated sludge and preparation method and application thereof |
| CN111995046B (en) * | 2020-08-26 | 2021-05-18 | 成都湛蓝未来环保科技有限公司 | Activated sludge and preparation method and application thereof |
| CN114230115A (en) * | 2021-12-27 | 2022-03-25 | 东莞理工学院 | Efficient sludge conditioner and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203728688U (en) | Small-size sewage treatment equipment | |
| CN104478175B (en) | The processing system of a kind of kitchen castoff anaerobic fermentation biogas slurry and method | |
| CN101264946B (en) | Iron-carbon pipe component capable of purifying waste water, integrated magnetoelectric oxidation biological filter chamber and application system | |
| CN105461147B (en) | A kind of Magneto separate water purification system and its purification method | |
| CN101318735B (en) | Sewage water denitrification processing method of artificial rapid infiltration system and application thereof | |
| CN207645995U (en) | One kind plus magnetic flocculation clarify sewage-treatment plant | |
| CN101698550A (en) | Advanced treating method of landfill leachate | |
| CN101486521A (en) | Method for treating starch wastewater by administration air-float-UASB-SBR | |
| CN207276432U (en) | A kind of mud decrement and the synchronous sewage-treatment plant for receiving phosphorus | |
| CN103979750B (en) | Reactor for sewage treatment and phosphorus recovery and method for recovering phosphorus by using same | |
| CN102515446B (en) | BCM (Biology Cilium Magnetic) biological sewage treatment system and BCM biological sewage treatment process | |
| CN102557359A (en) | Device for treating wastewater during production of pentaerythritol | |
| CN106517585A (en) | Method for staged removal of thallium from high thallium wastewater | |
| CN103288243A (en) | A system and a method for recycling coal mine drainage and power plant waste water with zero discharge | |
| CN109399870A (en) | A kind of integration Short-range efficient sewage-treatment plant and method for treating water | |
| CN202881052U (en) | Device for removing phosphorus chemically and forcibly by adopting A2O, membrane separation and cloth filter filtering | |
| CN106007167B (en) | The processing method of the pickling waste waters containing incretion interferent | |
| CN110104873A (en) | Municipal wastewater advanced treatment apparatus and its method | |
| CN103626323A (en) | Technology and special-purpose device for deep-treatment on pharmacy and papermaking waste water | |
| CN103193370A (en) | Phosphorus recovery device for excess sludge | |
| CN205368049U (en) | Sizing agent effluent treatment plant | |
| CN206051803U (en) | For the biochemical materialization coupled processing system of mineral loading of sewage disposal | |
| CN105621819A (en) | Heavy metal tailing pond leachate multielement combination ecological treatment system and method | |
| CN203112675U (en) | System for reclaiming phosphorus from residual sludge | |
| CN205473259U (en) | Integration continuous type fenton oxidation reduction sewage treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |