KR20130128866A - System and method for treating water using pressurized module - Google Patents
System and method for treating water using pressurized module Download PDFInfo
- Publication number
- KR20130128866A KR20130128866A KR1020120052986A KR20120052986A KR20130128866A KR 20130128866 A KR20130128866 A KR 20130128866A KR 1020120052986 A KR1020120052986 A KR 1020120052986A KR 20120052986 A KR20120052986 A KR 20120052986A KR 20130128866 A KR20130128866 A KR 20130128866A
- Authority
- KR
- South Korea
- Prior art keywords
- water
- membrane module
- port
- pressurized membrane
- backwashing
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/10—Use of feed
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Exemplary embodiments of the present invention relate to a water treatment system and a water treatment method using a pressurized membrane module, and more particularly, the pollutant separated in the pressurized membrane module backwashing process is effectively drained through water pressure through water supply. It relates to a water treatment system and a water treatment method using a pressurized membrane module to be discharged.
Membrane has the advantage of not only separating particles that are not dissolved by selectively passing certain components, but also easily separating dissolved substances dissolved in a liquid and substances having different properties from certain substances. Particularly, the separation membrane can separate organic pollutants, inorganic pollutants, parasites, bacteria, etc. contained in water.
Membrane filtration technology using such a separation membrane can be treated in a smaller area than the filtration method, such as sand filtration, it is stable to raw water turbidity fluctuations and has fewer advantages. In addition, it is possible to obtain a favorable treatment water irrespective of the skill of the driver, and to easily automate the operation management, thereby ensuring stable water quality.
Separators used in water treatment are hollow fiber type, and there are a pressurized module and a submerged system in which hollow fiber bundles are embedded. In the pressurized module, the hollow fiber bundles are aligned in the casing. The casing has a pressure rating and, if necessary, causes the feed pump to run on the module in response to backwash pressure. Immersion drives the membrane without casing. The membrane is usually immersed in an open water bath and the filtered water of the membrane is drawn under vacuum.
However, the pressurized module can be operated for a certain period of time even at a pressure higher than the limit pressure, so that it is easy to maintain, and it is possible to supply the planned water supply amount per day .
Separation membranes can be separated into solid-liquid liquids with less energy, but fouling of membranes has a problem of degrading membrane performance. Pollution phenomenon is that suspended solids in the water or substances having a property of being easily adsorbed on the membrane surface accumulate on the membrane surface and pore size, thereby impeding the flow of fluid, thereby reducing the permeability.
Particularly, in the case of the pressurized module, the raw water is supplied from only one lower inlet port in the filtration process, and the produced water discharged from the separation membrane flows out to the upper outlet port. Therefore, the contamination of the separation membrane progresses more rapidly at the lower end portion where the raw water is supplied, There is a problem.
In the Republic of Korea Patent Publication No. 2012-0033674 in the filtration process, the supply direction of the raw water alternately in both directions through the opening formed in the upper end and the lower end of the pressurized module housing in a bidirectional way, so that the contamination of the inside of the case and the membrane is not biased Disclosed are a filtration system and a filtration method using a module.
In addition, the Republic of Korea Patent Publication No. 2011-0054507 discloses a water treatment method that reduces the amount of contaminants deposited on both ends of the hollow fiber membrane, and performs the bottom filtering and top filtering alternately so that the contaminants are uniformly deposited on the hollow fiber membrane Suggesting.
However, the above patent merely considers the contamination of the membrane along the water supply direction of the raw water in the filtration process, and does not recognize any discharge of the contaminants generated by the backwashing process and remaining in the pressurized membrane module. Therefore, when the drainage process performed after the backwashing process of the pressurized membrane module is performed in a natural flow method, contaminants generated through the backwashing process may not be effectively discharged, and thus, the efficiency of the backwashing process may be reduced.
Embodiments of the present invention are to provide a water treatment system and a water treatment method using a pressurized membrane module that can be effectively discharged to the outside of the module by draining the pollutant separated from the module inner membrane in the backwashing process through water pressure through water supply. .
According to an embodiment of the present invention, a water treatment system includes a pressurized membrane including first and second ports respectively formed in a vertical direction at an upper end and a lower end of a housing, and third and fourth ports formed in a horizontal direction at an upper end and a lower end of a housing, respectively. In a water treatment apparatus using a module, Raw water tank for storing the raw water to be treated; And backwashing the pressurized membrane module with the production water and discharging the backwashing treatment water remaining in the pressurized membrane module through the second port at the pressure of the raw water supplied from the raw water tank to the third port. Include a drainage unit.
In addition, in the water treatment system according to an embodiment of the present invention, the raw water tank and the third port may be connected through a water supply line and a water supply valve.
In addition, the water treatment system according to an embodiment of the present invention, a supply unit for supplying the raw water to be treated to the pressurized membrane module, and for discharging the production water and concentrated water generated by treatment with the pressurized membrane module And a backwashing unit for backwashing the pressurized membrane module with the production water.
Further, in the water treatment system according to an embodiment of the present invention, the supply unit includes a raw water pump, a raw water line connecting the front end of the raw water pump and a fourth port, and a first valve installed at the raw water line. can do.
In addition, in the water treatment system according to an embodiment of the present invention, the production unit is a production water storage tank for storing the production water that is treated with the pressurized membrane module to remove foreign substances in raw water, the production water storage tank and the first A production water line connecting the port, a second valve installed in the production water line, a concentrated water line connected to the third port to discharge the concentrated water out of the pressurized membrane module, and installed in the concentrated water line It may include a third valve to be.
Further, in the water treatment system according to an embodiment of the present invention, the backwashing unit includes a backwashing line connecting the first port and the production water storage tank, a backwash pump installed in the backwashing line, and the backwashing. It may include a fourth valve installed in the line.
In the water treatment system according to an embodiment of the present invention, the water supply / drainage unit may include a water supply line connecting a raw water line and a concentrated water line between the first valve and the raw water pump, and a water supply installed in the water supply line. It may include a valve, a drain line connected to the second port for discharging the backwashing water remaining in the membrane module to the outside of the pressurized membrane module, and a drain valve provided with the drain line.
The water treatment method according to an embodiment of the present invention, the pressure-type membrane comprising a first and second ports formed in the vertical direction at the upper end and the lower end of the housing and a third and fourth ports formed in the horizontal direction at the upper end and the lower end of the housing, respectively. In the water treatment method using the module, the raw water is supplied through the third port and at the same time the second port is opened to backwash the pressurized membrane module with the produced water, and then the backwash treatment water remaining in the pressurized membrane module. It includes a supply / drainage step of discharging through the second port at the water pressure of the raw water supplied to the third port.
In addition, the water treatment method according to the embodiments of the present invention, by supplying the raw water to the pressure-type membrane module through the fourth port to produce the production water and the concentrated water to discharge through the first and third ports, respectively ; Backwashing the pressurized membrane module by supplying production water through the first port, and backwashing treatment water generated at this time is discharged to the outside through a third port; And supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module with the production water, and then supply the backwashing water remaining in the pressurized membrane module to the third port. It may include a supply / drainage step of discharging through the second port by the hydraulic pressure of the raw water.
In addition, in the water treatment method according to the embodiments of the present invention, air may be injected intermittently or continuously through the second port in the backwashing step.
In addition, in the water treatment method according to the embodiments of the present invention, the pressurized membrane module may include a fifth port formed in the vertical direction at the lower end of the housing.
In addition, the water treatment method according to embodiments of the present invention, in the filtration step, the raw water is supplied to the pressurized membrane module through the fourth port to produce the production water and the concentrated water, the production water is the first and Discharge through the fifth port, the concentrated water may be discharged through the third port.
In addition, the water treatment method according to the embodiments of the present invention, in the backwashing step, by supplying the production water through the first and fifth ports to backwash the pressurized membrane module, the backwashing treatment generated Water can be discharged to the outside through the third port.
In addition, in the water treatment method according to the embodiments of the present invention, the fifth port may be closed in the distribution / water supply stage.
Embodiment of the present invention by using the water pressure of the raw water supplied through the water supply process to effectively remove the contaminants remaining in the pressurized membrane module after the backwashing process externally to increase the removal efficiency of the pollutants.
In addition, in the embodiment of the present invention, since the drainage process and the water supply process are performed at the same time, the membrane filtration process cycle is shortened, thereby increasing the yield of the water treatment system.
These drawings are for the purpose of describing an embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
Figure 1 schematically shows the water supply, filtration, backwashing and draining process of the conventional pressurized membrane module.
2 is a block diagram schematically illustrating a water treatment system according to an exemplary embodiment of the present invention.
3 to 5 are block diagrams for explaining the water treatment method according to an embodiment of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.
In the following detailed description, the names of the components are denoted by the first, second, and so on in order to distinguish them from each other in terms of the same names, and are not necessarily limited to those in the following description.
1 schematically illustrates a water supply, filtration, backwashing and draining process of a conventional pressurized membrane module.
Referring to FIG. 1, the unit process control of the pressurized membrane module generally consists of a water supply process, a filtration process, a backwash process, and a drainage process to form one membrane filtration process cycle.
The filtration process removes turbidity from the raw water by passing the raw water through the membrane, and takes 20 to 30 minutes, which takes up the most time in one membrane filtration cycle.
Subsequently, the backwashing process is a process for restoring the filtration function of the membrane by supplying filtrate water in a direction opposite to the filtration process to discharge the suspended substance attached to the separator in the filtration process, which takes approximately 30 to 120 seconds.
Next, the drainage process is a process of completely discharging the suspended matter and contaminants remaining inside the membrane module and the pipe to the outside after the backwash process. At this time, the drainage is discharged to the outside by natural flow through the lowermost port of the pressurized membrane module housing. Typically 40 to 180 seconds.
Finally, the water supply process removes air inside the membrane module and adds water to prevent damage to the membrane due to sudden pressurization. The time should be adjusted to ensure sufficient water supply in the membrane module, which takes about 60 seconds.
Since the conventional drainage process is a natural drainage method, there is a problem in that the efficiency of the backwashing process is lowered because the pollutants remaining in the pressurized membrane module generated through the backwashing process cannot be effectively discharged.
Accordingly, the present invention proposes a water treatment system and a water treatment method capable of effectively discharging the contaminants remaining in the module generated through the back washing process by the water pressure of the raw water supplied through the water supply process by performing the water supply and drainage process at the same time.
2 is a block diagram schematically illustrating a water treatment system according to an exemplary embodiment of the present invention.
Referring to Figure 2, the water treatment system 100 according to an embodiment of the present invention is to purify the waste / waste water, industrial waste water and the like.
The water treatment system 100 according to the embodiment of the present invention has a structure in which foreign substances in raw water to be treated as a pressurized membrane module are produced to produce purified water, and the module can be backwashed as produced water.
In addition, the water treatment system 100 according to an embodiment of the present invention has a structure capable of discharging the contaminants remaining in the module after backwashing using the water pressure of the raw water through the water supply.
To this end, the water treatment system 100 according to the embodiment of the present invention basically includes a
The
The
Here, the
In the embodiment of the present invention, the
The
Here, the first valve V1 may be a solenoid valve type that opens and closes the flow path by an electrical signal, and likewise, various valves disclosed below may be made of a solenoid valve like the first valve V1.
In the embodiment of the present invention, the
The
In the embodiment of the present invention, the
To this end, a backwash line L4 connecting the production
In the exemplary embodiment of the present invention, the water supply /
The supply /
To this end, the
The water supply /
Hereinafter, with reference to the accompanying drawings the water treatment method by the wastewater water treatment system 100 according to an embodiment of the present invention configured as described above will be described in detail.
3 to 5 are block diagrams for explaining the water treatment method according to an embodiment of the present invention.
In the embodiment of the present invention, the water treatment process by the water treatment system 100, the filtration step (refer to Figure 3) to remove the foreign matter in the raw water, and the back washing step of backwashing the
First, referring to FIG. 3, in the filtration process according to the embodiment of the present invention, the first to third valves V1 to V3 are in an open state by a controller (not shown in the drawing). And the drain valves V4 to V6 are in a closed state, the raw water pump P1 is in an operating state, and the backwash pump P2 is in a stopped state.
In this state, the raw water stored in the
Then, various raw materials contained in the raw water may be removed while the raw water passes through the separator in the
In this way, the production water from which foreign substances in the raw water are removed through the
Here, the concentrated water removed from the separator while passing through the
On the other hand, when the
Meanwhile, as described above, after the normal operation of the water treatment system 100 is performed for a predetermined time, in the exemplary embodiment of the present invention, it may be converted to a backwashing process as shown in FIG. 4.
First, in the backwashing step, the first and second valves V1 and V2 are closed, the fourth valve V4 is opened, the backwash pump P2 is operated, and the raw water pump P1 is stopped. . At this time, the third valve V3 is in an open state, and the water supply valve V5 and the drain valve V6 are in a closed state.
Then, the product water stored in the production
Therefore, the contaminants fixed to the
In this process, when necessary, the cleaning efficiency may be increased by intermittently or continuously supplying air through the
In addition, it is possible to increase the washing efficiency by supplying chemicals such as sodium hypochlorite or chlorine with the production water if necessary.
On the other hand, if the
When the backwashing process as described above is finished, the drainage / water supply process proceeds as shown in FIG. 5 in the embodiment of the present invention.
At this time, the water supply and drain valves V5 and V6 are opened, the remaining valves are closed, the raw water pump P1 is operated, and the backwash pump P2 is stopped.
Then, the raw water stored in the
At the same time, the backwashing treatment water in which contaminants remaining in the
Therefore, the backwashing water in which the pollutants remaining in the
On the other hand, when the
As described above, in the embodiment of the present invention, a water supply process for supplying water into the
As described above, according to the exemplary embodiment of the present invention, the back pressure-treated
In addition, as both the drainage process and the water supply process time are shortened, the production cycle may increase, thereby increasing the output of the water treatment system.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.
10...
21 ...
23 ...
30 ...
41 ...
60 ... Feed / drain unit L1.. Enemies line
L2 ... Production line L3.. Brine line
L4... Backwash line L5... Watering line
L6... Drain line P1... Raw water pump
P2... Backwash pump
V1, V2, V3, V4, V5, V6 ... valve
Claims (14)
A raw water tank for storing raw water to be treated; And
After supplying the pressurized membrane module with backwashing to the production water, the backwashing treatment water remaining in the pressurized membrane module is discharged through the second port at the hydraulic pressure of the raw water supplied from the raw water tank to the third port. Drainage unit
Water treatment system using a pressurized membrane module comprising a.
The raw water tank and the third port is a water treatment system using a pressurized membrane module is connected via a water supply line and a water supply valve.
A supply unit for supplying raw water to be treated to the pressurized membrane module;
A production unit for discharging the produced water and the concentrated water generated by treatment with the pressurized membrane module;
Backwashing unit for backwashing the pressurized membrane module with production water
Water treatment system using a pressurized membrane module comprising a.
The supply unit includes:
With raw water pump,
A raw water line connecting the front end of the raw water pump and the fourth port;
A first valve installed in the raw water line
Water treatment system using a pressurized membrane module comprising a.
The production unit,
A production water storage tank which is treated with the pressurized membrane module and stores the production water from which foreign substances in raw water are removed;
A production water line connecting the production water storage tank and the first port;
A second valve installed at the production water line;
A concentrated water line connected to the third port and discharging the concentrated water to the outside of the pressurized membrane module;
A third valve installed in the brine line
Water treatment system using a pressurized membrane module comprising a.
The backwash unit is
A backwashing line connecting the first port and the production water storage tank,
A backwash pump installed in the backwash line,
A fourth valve installed in the backwashing line
Water treatment system using a pressurized membrane module comprising a.
The supply / drainage unit,
A water supply line connecting the raw water line and the concentrated water line between the raw water pump and the first valve,
A water supply valve installed in the water supply line;
A drain line connected to the second port to discharge the backwashing water remaining in the membrane module to the outside of the pressurized membrane module;
Drain valve in which the drain line is installed
Water treatment system using a pressurized membrane module comprising a.
Raw water supplied to the third port by supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module to the production water and then supplying the backwashing water remaining in the pressurized membrane module to the third port. / Drainage stage discharged through the second port by the water pressure of
≪ / RTI >
A filtration step of supplying raw water to the pressurized membrane module through the fourth port to produce production water and concentrated water, and discharging the water through the first and third ports;
Backwashing the pressurized membrane module by supplying production water through the first port, and backwashing treatment water generated at this time is discharged to the outside through a third port; And
Raw water supplied to the third port by supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module to the production water and then supplying the backwashing water remaining in the pressurized membrane module to the third port. / Drainage stage discharged through the second port by the water pressure of
≪ / RTI >
In the backwashing step,
And water is injected intermittently or continuously through the second port.
The pressurized membrane module includes a fifth port formed in the vertical direction in the lower end of the housing.
In the filtration stage,
Supplying raw water to the pressurized membrane module through a fourth port to produce produced water and concentrated water, wherein the produced water is discharged through the first and fifth ports, and the concentrated water is discharged through the third port. Way.
In the backwash phase,
Supplying the production water through the first and fifth ports to backwash the pressurized membrane module, wherein the generated backwashing water is discharged to the outside through the third port.
The fifth port is closed in the drainage / water supply stage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120052986A KR20130128866A (en) | 2012-05-18 | 2012-05-18 | System and method for treating water using pressurized module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120052986A KR20130128866A (en) | 2012-05-18 | 2012-05-18 | System and method for treating water using pressurized module |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20130128866A true KR20130128866A (en) | 2013-11-27 |
Family
ID=49855860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020120052986A KR20130128866A (en) | 2012-05-18 | 2012-05-18 | System and method for treating water using pressurized module |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20130128866A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20170011431A (en) * | 2015-07-23 | 2017-02-02 | (주)한경글로벌 | Apparatus and method for cleaning membrane module using steam |
KR20200103938A (en) | 2019-02-26 | 2020-09-03 | 농업회사법인 영암식품 주식회사 | Rice-cake using fig, garlic and its method |
KR20200103939A (en) | 2019-02-26 | 2020-09-03 | 농업회사법인 영암식품 주식회사 | Barley-cake using fig, garlic and its method |
KR20220120196A (en) | 2021-02-23 | 2022-08-30 | 백기봉 | Rice cake using oyster and its method |
-
2012
- 2012-05-18 KR KR1020120052986A patent/KR20130128866A/en active Search and Examination
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20170011431A (en) * | 2015-07-23 | 2017-02-02 | (주)한경글로벌 | Apparatus and method for cleaning membrane module using steam |
KR20200103938A (en) | 2019-02-26 | 2020-09-03 | 농업회사법인 영암식품 주식회사 | Rice-cake using fig, garlic and its method |
KR20200103939A (en) | 2019-02-26 | 2020-09-03 | 농업회사법인 영암식품 주식회사 | Barley-cake using fig, garlic and its method |
KR20220120196A (en) | 2021-02-23 | 2022-08-30 | 백기봉 | Rice cake using oyster and its method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6258454B2 (en) | Filtration system including pressurized hollow fiber membrane module | |
CN205295018U (en) | Portable degree of depth water processing system | |
KR101802600B1 (en) | water purifying system and backwash module control method thereof | |
EA029732B1 (en) | Underwater water treatment unit and method for cleaning said unit | |
KR100583005B1 (en) | Advanced water treatment package system and method therof | |
KR20130128866A (en) | System and method for treating water using pressurized module | |
JPWO2007083723A1 (en) | Membrane filtration apparatus and method for operating the same | |
JP2007289847A (en) | Raw tap water purification method and its apparatus | |
KR100847909B1 (en) | System for taking fresh water using centrifugal separation type pre-treatment filter apparatus | |
KR101769609B1 (en) | Two-way back washing device and reverse osmosis water purification system using the same | |
CN210885551U (en) | Waste liquid recovery device of electrode foil | |
KR20140128841A (en) | Apparatus for Cross cleaning water of membrane module and the operating method thereof | |
JP2018069169A (en) | Portable water purifying treatment device capable of connecting with ro membrane unit | |
JP5423184B2 (en) | Filtration membrane module cleaning method and cleaning apparatus | |
JP6530931B2 (en) | Method of desalting, method of cleaning demineralizer and demineralizer | |
KR101973736B1 (en) | Method for production of sludge dewatering cake in ceramic membrane filtration process using submerged membrane and pressurized membrane | |
KR101973738B1 (en) | Method for cleaning of ceramic membrane filtration system using submerged membrane and pressurized membrane | |
JP2005046762A (en) | Water treatment method and water treatment apparatus | |
JP3164640U (en) | Filtration equipment for removing fine turbidity | |
JP2010188250A (en) | Water treatment method | |
JP2006136753A (en) | High pressure type fine sand filter and filtering method using it | |
JPWO2015163429A1 (en) | Operation method of turbidity removal membrane module | |
JP2015123436A (en) | Water treatment method | |
KR20140107979A (en) | The Cleaning Method of Pressurized Membrane Module by using Dual-Backwash Process | |
KR102423512B1 (en) | Underwater plasma discharge ultrafilation apparatus and seawater desalination system comprising the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
N231 | Notification of change of applicant | ||
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
AMND | Amendment | ||
E902 | Notification of reason for refusal | ||
AMND | Amendment | ||
E601 | Decision to refuse application | ||
AMND | Amendment |