CN208949028U - A kind of processing system of coal mine drainage water - Google Patents
A kind of processing system of coal mine drainage water Download PDFInfo
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- CN208949028U CN208949028U CN201821487819.5U CN201821487819U CN208949028U CN 208949028 U CN208949028 U CN 208949028U CN 201821487819 U CN201821487819 U CN 201821487819U CN 208949028 U CN208949028 U CN 208949028U
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Abstract
The utility model embodiment provides a kind of processing system of coal mine drainage water, comprising: membrane chemical reactor and reverse osmosis unit；Reverse osmosis unit includes raw water reverse osmosis unit and concentrated water reverse osmosis unit；The water outlet of membrane chemical reactor is connect with the water inlet end of raw water reverse osmosis unit, and the concentrated water water outlet of raw water reverse osmosis unit is connect with the water inlet end of concentrated water reverse osmosis unit；Membrane chemical reactor includes coagulation reaction device and microporous filtration；The water outlet of coagulation reaction device and the water inlet end of microporous filtration connect；Microporous filtration includes water distribution area, produces pool, filtering area, the area Chu Zha and constant pressure back purge system.The processing system and processing method of the coal mine drainage water of the utility model embodiment, can significantly improve whole system to the rate of recovery of coal mine drainage water and reduce system operation energy consumption.
Description
Technical field
The utility model relates to water-treatment technology fields, more particularly to a kind of processing system of coal mine drainage water.
Background technique
Coal mine drainage water is the water body gushed out from coal seam during coal mining.The generation of coal mine drainage water
The water of the earth's surface infiltration water and water table that are generated during reason, usually pit mining, by sand mud particle, dust, dissolution
The pollution such as salt, acid, alkali, coal particles, grease is formed.As it can be seen that the pollutant component in coal mine drainage water is complicated, if
Direct emission easily causes environmental pollution.
The processing method of existing coal mine drainage water generallys use gravity depositing technology, such as: flocculation-precipitation process skill
Art, dense medium speed heavy water treatment technology, magnetic separation technique.
But existing gravity depositing technology is when handling coal mine drainage water, due to gravity depositing technology
Purification principle is limited, when coal mine drainage water water, Suspended Matter in Water content fluctuation when, effluent quality vulnerable to
It influences, causes effluent quality unstable.It therefore, can only by existing gravity depositing technology treated coal mine drainage water
Meet the general requirements such as sprinkling, depositing dust or qualified discharge, can not will produce the further reuse of water, leads to returning for coal mine drainage water
It is not high to receive utilization rate.
Utility model content
The processing system for being designed to provide a kind of coal mine drainage water of the utility model embodiment, to improve to coal
The recycling degree of mine coal mine drainage.Specific technical solution is as follows:
The utility model embodiment provides a kind of processing system of coal mine drainage water, comprising: membrane chemical reactor,
Reverse osmosis unit；Wherein, the reverse osmosis unit includes: raw water reverse osmosis unit and concentrated water reverse osmosis unit；The membranization
The water outlet of reactor is connect with the water inlet end of the raw water reverse osmosis unit, the concentrated water water outlet of the raw water reverse osmosis unit
It is connect with the water inlet end of the concentrated water reverse osmosis unit；
The membrane chemical reactor includes: coagulation reaction device and microporous filtration；Wherein, the coagulation reaction device
Water outlet connect with the water inlet end of the microporous filtration；The water inlet end of the coagulation reaction device is equipped with coagulating
Chemicals dosing plant；
The microporous filtration includes: to produce pool, filtering area, the area Chu Zha, water distribution area and constant pressure back purge system；Institute
It states and is provided with micro-filtration membrane module in filtering area.
Optionally, the top for producing pool and being set to the microporous filtration；The area Chu Zha is set to described micro-
The bottom of membrane filter.
Optionally, the microporous filtration immersed filter；The aperture of the micro-filtration membrane module is 0.1~0.4 μm；
The micro-filtration membrane module uses pipe pocket type, tubular type or hollow fiber microfiltration membrane；The material of the micro-filtration membrane module includes: poly- four
Vinyl fluoride, ethylene chlorotrifluoroethylene, fluorinated ethylene propylene copolymer, perfluoro propyl perfluoroalkyl vinyl ether polytetrafluoroethylene (PTFE)
At least one of copolymer, Kynoar.
Optionally, the water inlet end of the membrane chemical reactor is connected with buffer pool.
Optionally, blender is additionally provided in the coagulation reaction device.
Optionally, the first elevator pump is installed on the inlet pipeline of the microporous filtration.
Optionally, the production water water outlet for producing water water outlet and the concentrated water reverse osmosis unit of the raw water reverse osmosis unit
End, is respectively connected with fresh water header tank.
Optionally, the second elevator pump, the first security personnel are connected on the pipeline of the raw water reverse osmosis unit water inlet end in turn
Filter and the first booster pump；Third elevator pump, second are connected in turn on the pipeline of the concentrated water reverse osmosis unit water inlet end
Cartridge filter and the second booster pump；The concentrated water water outlet of the raw water reverse osmosis unit is also equipped with concentrated water case, the concentrated water
The water outlet of case is connected to the third elevator pump.
A kind of processing system of coal mine drainage water provided by the embodiment of the utility model, passes through membrane chemical reactor pair
Coal mine drainage water is pre-processed, and is carried out full dose filtering, is improved the reuse ratio of mine water, while producing water water quality is steady
It is fixed, meet the water inlet requirement of subsequent reverse osmosis process.Also, raw water reverse osmosis unit directly handles membrane chemical reactor and produces water,
Gained concentrated water again by concentrated water reverse osmosis treatment, fresh water obtained by raw water reverse osmosis unit and concentrated water reverse osmosis unit directly as
Technique produces water, and the system rate of recovery greatly improves, and can solve the problems, such as rich coal regional water imbalance between supply and demand to the maximum extent.When
So, any product or method for implementing the utility model must be not necessarily required to reach all the above advantage simultaneously.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described.
Fig. 1 is a kind of structural schematic diagram of the processing system of coal mine drainage water provided by the embodiment of the utility model.
In figure, 1. buffer pools, 2. membrane chemical reactors, 3. reverse osmosis units, 4. coagulation reaction devices, 401. coagulatings
Chemicals dosing plant, 402. blenders, 5. microporous filtrations, 501. first elevator pumps, 502. water producing tanks, 503. constant pressures backwash dress
It sets, 504. chemical cleaning tanks, 505. slag-drip openings, 506. micro-filtration membrane modules, 507. production pools, 508. filtering areas, 509. areas Chu Zha,
510. water distribution areas, 6. raw water reverse osmosis units, 601. second elevator pumps, 602. first cartridge filters, 603. first booster pumps,
7. concentrated water case, 8. concentrated water reverse osmosis units, 801. third elevator pumps, 802. second cartridge filters, 803. second booster pumps, 9.
Fresh water header tank, 10. washing unit with reverse osmosis membrane.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Existing coal mine drainage water treatment technology, there are also using inorganic ceramic membranous system to coal mine drainage water into
Row processing, although produce water can further industrial water etc. of the desalting processing for underground coal mine special equipment, the concentrated water generated
It can be returned directly in pumping equipment, entire inorganic ceramic membranous system is low to the rate of recovery of water, and changes adaptability to mine water
It is poor.Moreover, inorganic ceramic membranous system need to increase the pretreatment such as V-type filter tank facility, and capital cost is at high cost, also,
Inorganic ceramic membranous system mostly uses the big cross-flow filtration form of internal pressure, and required energy consumption is higher, and operating cost is high.
In view of this, as shown in Figure 1, the utility model embodiment provides a kind of processing system of coal mine drainage water
System, the system include:
Membrane chemical reactor (MCR, Membrance Chemical Reactor) 2 and reverse osmosis unit 3.Wherein, reverse osmosis
Saturating device 3 includes: raw water reverse osmosis unit 6 and concentrated water reverse osmosis unit 8.The water outlet of membrane chemical reactor 2 and raw water reverse osmosis
The water inlet end of saturating device 6 is by piping connection, to form the pipeline of connection.Apparatus structure according to figure 1 is it is found that coal mine
Coal mine drainage flows through after membrane chemical reactor 2 is cleaned, and can successively flow into raw water reverse osmosis unit 6 and the reverse osmosis dress of concentrated water again
Set 8.
In the utility model embodiment, membrane chemical reactor 2 includes: coagulation reaction device 4 and microporous filtration 5,
In, the water outlet of coagulation reaction device 4 and the water inlet end of microporous filtration 5 are by piping connection, to form the pipe of connection
Road.
Above-mentioned coagulation reaction device 4 is used to remove the hardness in coal mine drainage water.
As a kind of specific embodiment of the utility model embodiment, the water inlet end of coagulation reaction device 4 can pass through
Pipeline installs coagulating chemicals dosing plant 401, and coagulating chemicals dosing plant 401 may include multiple grug feeding jars, in each grug feeding jar
The medicaments such as sodium carbonate, sodium hypochlorite, Polyferric Sulfate are stored respectively.Blender 402 can also be set in coagulation reaction device 4, it can
It mixes the medicament being added in coagulation reaction device 4 sufficiently with coal mine drainage water, improves the reaction efficiency of medicament and water body.
Above-mentioned microporous filtration 5 can be energy-saving immersed filter.Microporous filtration 5 includes: to produce pool
507, filtering area 508, the area Chu Zha 509 and constant pressure back purge system 503.
Wherein, the top that pool 507 is set to microporous filtration 5 is produced.
Wherein, be provided with micro-filtration membrane module 506 in filtering area 508, micro-filtration membrane module 506 using pipe pocket type, tubular type or in
Hollow fiber microfiltration membranes, aperture are 0.1~0.4 μm, generally use polytetrafluoroethylene (PTFE) (PTFE), ethylene chlorotrifluoroethylene
(ECTFE), fluorinated ethylene propylene copolymer (FEP), perfluoro propyl perfluoroalkyl vinyl ether teflon-copolymers (PFA), poly-
The perfluors such as vinylidene (PVDF) or high fluorinated polymer material.
Wherein, the area Chu Zha 509 is set to the bottom of microporous filtration 5, and the suspended matter in coal mine drainage water can be with
It is discharged by slag-drip opening 505, discharge form is the solid-liquid form that solid content is greater than 10%.
Wherein, water distribution area 510 is located at the lower part of microporous filtration 5, is used for water distribution.
Wherein, the water inlet end of constant pressure back purge system 503 is connected to the filtering area 508 of microporous filtration 5, water outlet with
Coagulation reaction device 4 is connected to, and the water body after can making backwash flows into coagulation reaction device 4 and is recycled again, rather than
Directly as waste water outlet, the utilization rate of coal mine drainage water is improved to the maximum extent.
Water producing tank 502 is connected to microporous filtration 5 by pipeline, through the purified coal mine of microporous filtration 5
Drainage water can be passed through water producing tank 502 and be stored, and use for subsequent reverse osmosis treatment.Microporous filtration 5 can be effective
The suspended matter in coal mine drainage water is removed, water turbidity is produced and is less than 0.3NTU.Compared to existing gravity depositing technology, it is not easy
It is influenced by coal mine drainage water water, the fluctuation of Suspended Matter in Water content, producing water water quality is stablized, and meets subsequent reverse osmosis
Treatment process is required with water.Compared to other membrane treatment process, have the characteristics that investment is low, low energy consumption.
It can be with as a kind of specific embodiment of the utility model embodiment, on the inlet pipeline of microporous filtration 5
First elevator pump 501 is installed, for the coal mine drainage water in coagulation reaction device 4 to be delivered to microporous filtration 5
In.
As a kind of specific embodiment of the utility model embodiment, the bottom of microporous filtration 5 is pacified by pipeline
Equipped with chemically-cleaning device 504, effect is to be cleaned by cleaning agent to microporous filtration 5.
It, can be in the water inlet end of membrane chemical reactor 2 as a kind of specific embodiment of the utility model embodiment
There is buffer pool 1 by piping connection, which can store the coal mine drainage water attracted by pipeline, alleviate fluctuation.
In the utility model embodiment, the concentrated water water outlet of raw water reverse osmosis unit 6 and the water inlet of concentrated water reverse osmosis unit 8
End is by piping connection, that is, the concentrated water that raw water reverse osmosis unit 6 generates, can carry out reverse osmosis into concentrated water reverse osmosis unit 8
Processing improves whole system to Coal Mine so as to further utilize generated concentrated water, rather than by concentrated water direct emission
The rate of recovery of Jing Shuganshui.
Also, the technique of raw water reverse osmosis unit 6 and concentrated water reverse osmosis unit 8 produces water and can directly use, for example, can make
For boiler feed waters such as rich coal area power plant or coal oil factory, Methanol Plants.
As a kind of specific embodiment of the utility model embodiment, the production water water outlet of raw water reverse osmosis unit 6 with
And the production water water outlet of concentrated water reverse osmosis unit 8, there is fresh water header tank 9 by piping connection, that is, raw water reverse osmosis unit
6 and concentrated water reverse osmosis unit 8 production water can by fresh water header tank 9 collect store, producing water water quality can satisfy technique produce water
Use demand.
As a kind of specific embodiment of the utility model embodiment, on the pipeline of 6 water inlet end of raw water reverse osmosis unit
It is connected with the second elevator pump 601, the first cartridge filter 602 and the first booster pump 603 in turn.Wherein, elevator pump is used for original
The conveying of water reverse osmosis unit 6 provides power when producing water；Cartridge filter is used to filter the subtle substance in water body, it is ensured that water quality mistake
It filters precision and protects film filtering element not by the damage of large particulate matter；The effect of booster pump is further increased to raw water reverse osmosis
The saturating conveying of device 6 produces hydraulic pressure when water.
Similarly, the security personnel of third elevator pump 801, second are connected on the pipeline of 8 water inlet end of concentrated water reverse osmosis unit in turn
The effect of filter 802 and the second booster pump 803, each component is identical as the effect of each component in raw water reverse osmosis unit 6,
This is repeated no more.
As a kind of specific embodiment of the utility model embodiment, raw water reverse osmosis unit 6 and the reverse osmosis dress of concentrated water
A concentrated water case 7 can also be installed by setting on the pipeline between 8, for storing the concentrated water of the generation of raw water reverse osmosis unit 6.Specifically
Ground, the water inlet end pipeline of concentrated water case 7 can be installed on the water outlet of raw water reverse osmosis unit 6, the water outlet pipeline peace of concentrated water case 7
Water inlet end loaded on the connection of the second elevator pump 601.
As a kind of specific embodiment of the utility model embodiment, the water inlet end of raw water reverse osmosis unit 6 and dense
The water inlet end of water reverse osmosis unit 8 can have washing unit with reverse osmosis membrane 10 by piping connection.Washing unit with reverse osmosis membrane
Cleaning agent is stored in 10, for cleaning to raw water reverse osmosis unit 6 and concentrated water reverse osmosis unit 8.
A kind of processing system of coal mine drainage water provided by the embodiment of the utility model, passes through membrane chemical reactor pair
Coal mine drainage water is pre-processed, and is carried out full dose filtering, is improved the reuse ratio of mine water, while producing water water quality is steady
It is fixed, meet the water inlet requirement of subsequent reverse osmosis process.Also, raw water reverse osmosis unit directly handles membrane chemical reactor and produces water,
Gained concentrated water again by concentrated water reverse osmosis treatment, fresh water obtained by raw water reverse osmosis unit and concentrated water reverse osmosis unit directly as
Technique produces water, and the system rate of recovery greatly improves, and can solve the problems, such as rich coal regional water imbalance between supply and demand to the maximum extent.
The utility model embodiment provides the processing method of the processing system of above-mentioned coal mine drainage water, comprising:
Step A, coal mine drainage water is introduced into buffer pool 1 by pipeline, then introduces membrane chemical reactor from buffer pool 1
In 2 coagulation reaction device 4.
Step B, the medicaments such as sodium carbonate, Polyferric Sulfate are added to coagulation reaction device 4 by coagulating chemicals dosing plant 401, then
The water body in coagulation reaction device 4 is stirred by blender 402, carries out coagulating, with the hardness gone in water removal.
It should be noted that sodium carbonate, Polyferric Sulfate are that coagulating routinely uses medicament, the additive amount of medicament can be by skill
Art personnel are adjusted according to practical coal mine drainage water water quality, and the utility model embodiment is it is not limited here.
Step C, water outlet obtained by coagulating is passed through in microporous filtration 5 by the first elevator pump 501, through microfiltration membranes
After component 506 filters, the suspended matter in coal mine drainage water is removed.Gained produces water and flows into water producing tank 502, and gained waste residue passes through
Slag-drip opening 505 is discharged, and it is the solid-liquid form that solid content is greater than 10% that form, which is discharged, in waste residue.
Wherein, the turbidity that gained produces water is less than 0.3NTU, and hardness is less than 10mg/L, ensure that the steady of subsequent reverse osmosis process
Fixed operation.
Step D, gained production water is passed sequentially through into the second elevator pump 601 and the first booster pump 603 is passed through the reverse osmosis dress of raw water
6 are set, gained fresh water is passed through fresh water header tank 9, saves as technique and produces water use.
Step E, the concentrated water for generating raw water reverse osmosis unit 6, it is logical by third elevator pump 801 and the second booster pump 803
Enter concentrated water reverse osmosis unit 8, is further filtered by concentrated water reverse osmosis unit 8, can further utilize generated concentrated water, and
It is not by concentrated water direct emission, to improve whole system to the rate of recovery of coal mine drainage water.
Step F, the fresh water for generating raw water reverse osmosis unit 6 is passed through fresh water header tank 9.
As a kind of optional embodiment of the utility model embodiment, 5 sewerage disposing process of microporous filtration is specific
Are as follows:
Feed liquor: it will be discharged obtained by coagulating, be introduced into microporous filtration 5 by the first elevator pump 501；
Filtering: water body is filtered through the micro-filtration membrane module 506 in microporous filtration 5；
Recoil: the constant pressure back purge system 503 of microporous filtration 5 is opened, and produces the production water in pool 507 from micro-filtration membrane module
The outflow of 506 interior, recoils to micro-filtration membrane module 506；Constant pressure back purge system
503 are not required to additional energy；
Deslagging: the filter cake or reaction suspended matter that the area Chu Zha 509 deposits pass through row in the form of solid-liquid of the solid content greater than 10%
Cinder notch 505 is discharged.
The processing system of coal mine drainage water provided by the embodiment of the utility model and existing flocculation-precipitation process system
System, when handling respectively the coal mine drainage water of Shaanxi large coal mine, sewage load and coal mine drainage
The water rate of recovery is as shown in table 1:
Processing data when 1 Water condition system of table is to coal mine drainage water process
According to table 1, by the processing system of the coal mine drainage water of the utility model embodiment to coal mine
When drainage water is handled, the rate of recovery of coal mine drainage water is up to 86.9%；And existing flocculation-precipitation process system
The rate of recovery is 67.5%.As it can be seen that the utility model embodiment is compared to the existing coal mine drainage based on gravity depositing technology
Water treatment system can greatly improve the recovery utilization rate to coal mine drainage water, while saving production cost, moreover it is possible to
The discharge amount for reducing subsequent sewage, is more conducive to environmental protection.
It should be noted that in the processing system of the coal mine drainage water of the utility model, in each section of device
Between trandfer fluid, such as liquid, such as waste water, fresh water, various dopes or solid, such as precipitating and various medicaments, except as otherwise
Illustrate, can generally pass through Pipeline transport；It, can be in addition, when needing additional transmission power during transportation
The power-equipments such as suitable pump, blower are added on the pipeline of needs.Further, can also increase on pipeline when needed
Add suitable valve, to control the flow direction etc. of fluid.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, such as term " includes " or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment for including a series of elements not only includes those elements,
It but also including other elements that are not explicitly listed, or further include solid by this process, method, article or equipment
Some elements.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (8)
1. a kind of processing system of coal mine drainage water characterized by comprising membrane chemical reactor (2), reverse osmosis unit
(3)；Wherein, the reverse osmosis unit (3) includes: raw water reverse osmosis unit (6) and concentrated water reverse osmosis unit (8)；The membranization
The water outlet for learning reactor (2) is connect with the water inlet end of the raw water reverse osmosis unit (6), the raw water reverse osmosis unit (6)
Concentrated water water outlet connect with the water inlet end of the concentrated water reverse osmosis unit (8)；
The membrane chemical reactor (2) includes: coagulation reaction device (4) and microporous filtration (5)；Wherein, the coagulation is anti-
The water outlet of device (4) and the water inlet end of the microporous filtration (5) is answered to connect；The water inlet of the coagulation reaction device (4)
End is equipped with coagulating chemicals dosing plant (401)；
The microporous filtration (5) include: produce pool (507), filtering area (508), the area Chu Zha (509), water distribution area (510) with
And constant pressure back purge system (503)；Micro-filtration membrane module (506) are provided in the filtering area (508).
2. the processing system of coal mine drainage water according to claim 1, which is characterized in that the production pool (507)
It is set to the top of the microporous filtration (5)；The area Chu Zha (509) is set to the bottom of the microporous filtration (5)
Portion.
3. the processing system of coal mine drainage water according to claim 1, which is characterized in that the microporous filtration
It (5) is immersed filter；The aperture of the micro-filtration membrane module (506) is 0.1~0.4 μm；The micro-filtration membrane module (506) is adopted
With pipe pocket type, tubular type or hollow fiber microfiltration membrane；The material of the micro-filtration membrane module (506) includes: polytetrafluoroethylene (PTFE), ethylene
Chlorotrifluoroethylene, perfluoro propyl perfluoroalkyl vinyl ether teflon-copolymers, gathers partially fluorinated ethylene propylene copolymer
At least one of vinyl fluoride.
4. the processing system of coal mine drainage water according to claim 1, which is characterized in that the membrane chemical reactor
(2) water inlet end is connected with buffer pool (1).
5. the processing system of coal mine drainage water according to claim 1, which is characterized in that the coagulation reaction device
(4) blender (402) are additionally provided in.
6. the processing system of coal mine drainage water according to claim 1, which is characterized in that the microporous filtration
(5) the first elevator pump (501) are installed on inlet pipeline.
7. the processing system of coal mine drainage water according to claim 1, which is characterized in that the reverse osmosis dress of raw water
The production water water outlet of (6) and the production water water outlet of the concentrated water reverse osmosis unit (8) are set, fresh water header tank (9) are respectively connected with.
8. the processing system of coal mine drainage water according to claim 1, which is characterized in that the reverse osmosis dress of raw water
It sets and is connected with the second elevator pump (601), the first cartridge filter (602) and the first booster pump on the pipeline of (6) water inlet end in turn
(603)；It is connected with third elevator pump (801) on the pipeline of concentrated water reverse osmosis unit (8) water inlet end in turn, second ensured public security
Filter (802) and the second booster pump (803)；The concentrated water water outlet of the raw water reverse osmosis unit (6) is also equipped with concentrated water case
(7), the water outlet of the concentrated water case (7) is connected to the third elevator pump (801).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109052729A (en) * | 2018-09-11 | 2018-12-21 | 博天环境集团股份有限公司 | A kind of processing system and processing method of coal mine drainage water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109052729A (en) * | 2018-09-11 | 2018-12-21 | 博天环境集团股份有限公司 | A kind of processing system and processing method of coal mine drainage water |
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Effective date of registration: 20201231 Address after: Room 12a06-08, Shougang complex building, 60 Xizhimen North Street, Haidian District, Beijing 100082 Patentee after: POTEN ENVIRONMENT GROUP Co.,Ltd. Patentee after: MEMSINO MEMBRANE TECHNOLOGY (BEIJING) Co.,Ltd. Address before: 100082 12A1206-08 building, Shougang complex, 60 Xizhimen North Street, Haidian District, Beijing Patentee before: POTEN ENVIRONMENT GROUP Co.,Ltd. Patentee before: MEMSINO MEMBRANE TECHNOLOGY (BEIJING) Co.,Ltd. Patentee before: ZHONGHUAN FILM MATERIAL TECHNOLOGY (DAYE) Co.,Ltd. |