CN208449073U - A kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system - Google Patents
A kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system Download PDFInfo
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- CN208449073U CN208449073U CN201820777214.3U CN201820777214U CN208449073U CN 208449073 U CN208449073 U CN 208449073U CN 201820777214 U CN201820777214 U CN 201820777214U CN 208449073 U CN208449073 U CN 208449073U
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- reverse osmosis
- container
- input terminal
- water tank
- medicinal cupping
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- 238000004140 cleaning Methods 0.000 title claims abstract description 61
- 239000012528 membrane Substances 0.000 title claims abstract description 39
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000003513 alkali Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 abstract description 12
- 239000003814 drug Substances 0.000 abstract description 5
- 238000005554 pickling Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000006210 lotion Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012875 nonionic emulsifier Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 perborate etc. Substances 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a kind of disc tube reverse osmosis (dt-ro) Membrane cleaning systems, including percolate raw water tank, pretreatment unit, washing unit with reverse osmosis membrane, water quality detection equipment and the container for being internally provided with disc tube reverse osmosis (dt-ro) film to be cleaned, the output end of percolate raw water tank with valvular pipeline with the input terminal of container and water quality detection equipment by connecting, the output end of pretreatment unit with valvular pipeline with the input terminal of percolate raw water tank by connecting, the output end of washing unit with reverse osmosis membrane and the input terminal of container connect, the output end of container with valvular pipeline with the input terminal of water quality detection equipment by connecting.The utility model combines the two advantage by the way that physical cleaning and chemical cleaning become one.The mode of three kinds of other medicament cleanings, pickling and alkali cleaning chemical cleanings is realized simultaneously, single cleaning or combined type cleaning can be carried out according to effluent quality situation, be can solve the stifled various problems of disc tube reverse osmosis (dt-ro) film dirt.
Description
Technical field
The utility model relates to the cleaning systems of environmental technology field more particularly to a kind of disc tube reverse osmosis (dt-ro) film of integrated form
System.
Background technique
The fouling membrane of disc tube reverse osmosis (dt-ro) film (RCDT) can be divided by microorganism adsorption and growth pollution, organic matter absorption
Pollution, colloid and focusing particles pollution and inorganic matter precipitating four major class of pollution.In actual moving process, pollution mechanism compared with
Complexity, various pollution types occur together, wherein influent quality be influence fouling membrane principal element, such as solution pH not
The properties such as the charge of solute are only affected, while also affecting the characteristic of film surface, to affect between solute and film surface
Interaction and solute in the deposition and membrane flux of film surface, and water inlet is handled, then can extend membrane lifetime.
Successfully pretreatment can delay the fouling of film surface, Protective coatings from sensitive materials destruction, but with when
Between elapse, chemical contamination (metal oxide, colloid etc.) and biological pollution (bacterium sticks mud etc.) still occurs for film surface, therefore periodically
Cleaning is considered as the pith of system operatio.Membrane cleaning is divided into physical cleaning and chemical cleaning: physical cleaning refers to according to machine
The method that tool principle cleans film, have high-pressure water flow washing, explosion and explosion cleaning, ultrasonic cleaning, Dry ice cleaning with
And the technologies such as laser cleaning, and common physical cleaning method is waterpower cleaning in water process；The method of chemical cleaning has very
It is more, alkali cleaning, sour cleaning, surfactant washing, complexing agent cleaning, polyelectrolyte can be divided into according to the type of chemical
Cleaning, disinfectant cleaning, organic solvent cleaning, the cleaning of compound medicament and enzyme cleaning.
Utility model content
The utility model aim is to provide a kind of integrated form, has chemical cleaning and physical cleaning in the dish tubular type of one
The cleaning system of reverse osmosis membrane, to solve the above problems.
To achieve the above object, the utility model discloses a kind of disc tube reverse osmosis (dt-ro) Membrane cleaning systems, including percolate
Raw water tank, washing unit with reverse osmosis membrane, water quality detection equipment and the container for being internally provided with disc tube reverse osmosis (dt-ro) film to be cleaned, institute
The output end of percolate raw water tank is stated by connecting with valvular pipeline with the input terminal of the container and water quality detection equipment,
The output end of the washing unit with reverse osmosis membrane and the input terminal of container connect, and the output end of the container passes through with valvular
Pipeline is connect with the input terminal of the water quality detection equipment.
Further, the washing unit with reverse osmosis membrane includes clean water tank, and the clean water tank is by being arranged valvular pipe
Road is connect with the container.
Further, the washing unit with reverse osmosis membrane further includes antisludging agent medicinal cupping, and the antisludging agent medicinal cupping passes through setting
Valvular pipeline is connect with the container.
Further, further include pretreatment unit, the output end of the pretreatment unit by with valvular pipeline with
The input terminal connection of the percolate raw water tank, container.
Further, the pretreatment unit includes sour medicinal cupping and alkali medicinal cupping, the output end of the acid medicinal cupping and alkali medicinal cupping
It is connect by the way that valvular pipeline is arranged with the input terminal of the input terminal of the percolate raw water tank, container.
Further, the output end of the container passes through the defeated of a valvular pipeline of setting and the percolate raw water tank
Enter end connection.
Further, the sour medicinal cupping and alkali medicinal cupping are parallel with one another, and pipeline and the institute of valve are arranged by same band
State the input terminal connection of percolate raw water tank, the acid medicinal cupping, alkali medicinal cupping, clean water tank and antisludging agent medicinal cupping by same pipeline with
The input terminal of container connects.
Compared with the prior art, the advantages of the utility model are:
The advantages of the utility model by physical cleaning and chemical cleaning by becoming one, combining the two, at the same it is real
The mode of three kinds of other medicament cleanings, pickling and alkali cleaning chemical cleanings is showed, can have been carried out according to effluent quality situation single clear
It washes or combined type cleaning, can solve the stifled various problems of disc tube reverse osmosis (dt-ro) film dirt.It is not very serious for blocking up situation in film dirt
When, directly cleaned using waterpower, or waterpower is cleaned as customary cleaning, by greatly save Membrane cleaning time and at
This.Meanwhile by being pre-processed to percolate, the stability of salt rejection rate and membrane flux further can be improved, be conducive to extend
The service life of reverse osmosis membrane diaphragm.
Below with reference to accompanying drawings, the utility model is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide a further understanding of the present invention, the utility model
Illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.In attached drawing
In:
Fig. 1 is the structural schematic diagram of disc tube reverse osmosis (dt-ro) Membrane cleaning system disclosed in the utility model embodiment.
Marginal data:
1, percolate raw water tank；2, water quality detection equipment；3, container；4, sour medicinal cupping；5, alkali medicinal cupping；6, clean water tank；7, it hinders
Dirty agent medicinal cupping.
Specific embodiment
The embodiments of the present invention are described in detail below in conjunction with attached drawing, but the utility model can be by right
It is required that the multitude of different ways for limiting and covering is implemented.
As shown in Figure 1, the utility model discloses a kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system, including percolate raw water tank
1, pretreatment unit, washing unit with reverse osmosis membrane, water quality detection equipment 2 and it is internally provided with disc tube reverse osmosis (dt-ro) film to be cleaned
(RCDT) container 3, the output end of percolate raw water tank 1 is by with valvular pipeline and container 3 and water quality detection equipment 2
Input terminal connection, the output end of pretreatment unit by being connect with valvular pipeline with the input terminal of percolate raw water tank 1, from
And the percolate of percolate raw water tank 1 is pre-processed, in the present embodiment, pretreatment unit includes sour medicinal cupping 4 and alkali medicine
Input terminal, the container 3 that the output end of tank 5, sour medicinal cupping 4 and alkali medicinal cupping 5 passes through setting valvular pipeline and percolate raw water tank 1
Input terminal connection, wherein acid cleaning is primarily to removal metal oxide dirt, scale and silicon dioxide dirt etc..And acid is clear
Lotion is chosen as the acids such as hydrochloric acid, sulfuric acid, nitric acid.Meanwhile acid cleaning can also remove it is inorganic in film surface and fenestra
Object and insoluble substance.And alkali cleans mainly for removing grease and silica fouling in solution etc., cleaning agent can
It is selected as sodium hydroxide, calcium carbonate, sodium phosphate, sodium metasilicate, perborate etc., alkali cleaning can both remove organic matter or remove
Inorganic pollution, wherein perborate is also used to the colloidal substance in cleaning fenestra.
In turn, sour medicinal cupping 4 and alkali medicinal cupping 5 can input acid or aqueous slkali tune by pipeline into percolate raw water tank 1
The properties such as the charge for saving its pH value, and then adjusting its interior solute, thus optimize interaction between solute and film surface and
Deposition and membrane flux of the solute in film surface.Meanwhile sour medicinal cupping 4 and alkali medicinal cupping 5 can also be by directly to anti-in container 3
Permeable membrane is rinsed, and improves solute in the deposition and membrane flux of film surface.The output end of container 3 passes through with valvular pipe
Road is connect with the input terminal of water quality detection equipment 2, so that water quality detection equipment 2 can then detect untreated original solution and place in time
The parameters such as pH, operating pressure, inflow temperature, the conductivity of the solution after reason, to further instruct to percolate raw water tank 1
Interior water quality adjustment.Meanwhile water quality detection equipment 2 can be discharged disc tube reverse osmosis (dt-ro) film clear water by control valve and carry out water
Quality detection (Testing index is mainly conductivity and membrane flux), by Testing index determine the dirt of disc tube reverse osmosis (dt-ro) film block up degree with
The origin cause of formation to determine the cleaning way of film column and selects medicament with this.
Since water cleaning will not change the molecular structure of pollutant, environmental pollution is not caused, it is small to workers ' health damage, no
The interaction between pollutant and film surface can significantly be changed, the structure that will not change film weakens its performance.Thus,
In the present embodiment, washing unit with reverse osmosis membrane is set as further including clean water tank 6, and clean water tank 6 is by being arranged valvular pipeline
It is connect with container 3, wherein the turbid after cleaning can be exported by the turbid on container 3 to be discharged, then is uniformly processed.
In the present embodiment, in order to which substances, the washing unit with reverse osmosis membrane such as the scale that cleans film surface further include antisludging agent
Medicinal cupping 7, antisludging agent medicinal cupping 7 connect, certainly, clean water tank 6 and antisludging agent medicinal cupping 7 with container 3 by the way that valvular pipeline is arranged
Be readily modified as surfactant washing tank (mainly to disperse film surface oils, lipid and microorganism generate deposit,
The contact of cleaning agent with the deposit of film surface can be improved, reduce water consumption, shorten scavenging period.Common surface-active is clear
Lotion is low alveolitoid nonionic surfactant or emulsifier, mainly to remove degreasing).
In the present embodiment, the input that the output end of container 3 passes through setting valvular a pipeline and percolate raw water tank 1
End connection, thus, the more clean liquid after cleaning to container 3 can enter percolate raw water tank 1, and then again by container 3
Filtering realizes circulation then using being discharged after water quality detection equipment 2.
In the present embodiment, sour medicinal cupping 4 and alkali medicinal cupping 5 are parallel with one another, and by same band be arranged valve pipeline with
The input terminal of percolate raw water tank 1 connects, and sour medicinal cupping 4, alkali medicinal cupping 5, clean water tank 6 and antisludging agent medicinal cupping 7 pass through same setting valve
The pipeline of door is connect with the input terminal of container 3, to save live stringing, and then has been saved cost, has been improved the steady of system
It is qualitative.
The above is only the preferred embodiments of the utility model, are not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system, which is characterized in that cleaned including percolate raw water tank (1), reverse osmosis membrane
Device, water quality detection equipment (2) and the container (3) for being internally provided with disc tube reverse osmosis (dt-ro) film to be cleaned, the percolate raw water
The output end of tank (1) with valvular pipeline with the input terminal of the container (3) and water quality detection equipment (2) by connecting, institute
The output end for stating washing unit with reverse osmosis membrane is connect with the input terminal of container (3), and the output end of the container (3) is by having valve
The pipeline of door is connect with the input terminal of the water quality detection equipment (2).
2. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 1, which is characterized in that the reverse osmosis membrane cleaning dress
It sets including clean water tank (6), the clean water tank (6) is connect by the way that valvular pipeline is arranged with the container (3).
3. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 2, which is characterized in that the reverse osmosis membrane cleaning dress
Setting further includes antisludging agent medicinal cupping (7), and the antisludging agent medicinal cupping (7) is connect by the way that valvular pipeline is arranged with the container (3).
4. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 3, which is characterized in that it further include pretreatment unit,
The output end of the pretreatment unit passes through the input terminal with valvular pipeline and the percolate raw water tank (1), container (3)
Connection.
5. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 4, which is characterized in that the pretreatment unit includes
The output end of sour medicinal cupping (4) and alkali medicinal cupping (5), the acid medicinal cupping (4) and alkali medicinal cupping (5) is by being arranged valvular pipeline and institute
State the input terminal connection of the input terminal, container (3) of percolate raw water tank (1).
6. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 5, which is characterized in that the output of the container (3)
End is connect by a valvular pipeline of setting with the input terminal of the percolate raw water tank (1).
7. disc tube reverse osmosis (dt-ro) Membrane cleaning system according to claim 6, which is characterized in that the acid medicinal cupping (4) and alkali
Medicinal cupping (5) is parallel with one another, and the pipeline of valve and the input terminal company of the percolate raw water tank (1) are arranged by same band
It connects, the acid medicinal cupping (4), alkali medicinal cupping (5), clean water tank (6) and antisludging agent medicinal cupping (7) pass through the defeated of same pipeline and container (3)
Enter end connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820777214.3U CN208449073U (en) | 2018-05-23 | 2018-05-23 | A kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820777214.3U CN208449073U (en) | 2018-05-23 | 2018-05-23 | A kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system |
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| Publication Number | Publication Date |
|---|---|
| CN208449073U true CN208449073U (en) | 2019-02-01 |
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ID=65149808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820777214.3U Active CN208449073U (en) | 2018-05-23 | 2018-05-23 | A kind of disc tube reverse osmosis (dt-ro) Membrane cleaning system |
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| Country | Link |
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| CN (1) | CN208449073U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240230A (en) * | 2019-07-18 | 2019-09-17 | 深圳市洪桦环保科技有限公司 | A kind of anti-clogging water washing device and application method |
| CN113069931A (en) * | 2021-05-06 | 2021-07-06 | 镇江沁远电力设备有限公司 | Novel reverse osmosis membrane cleaning process |
-
2018
- 2018-05-23 CN CN201820777214.3U patent/CN208449073U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240230A (en) * | 2019-07-18 | 2019-09-17 | 深圳市洪桦环保科技有限公司 | A kind of anti-clogging water washing device and application method |
| CN113069931A (en) * | 2021-05-06 | 2021-07-06 | 镇江沁远电力设备有限公司 | Novel reverse osmosis membrane cleaning process |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Disc tube type reverse osmosis membrane cleaning system Effective date of registration: 20210928 Granted publication date: 20190201 Pledgee: Changsha Lugu sub branch of China Everbright Bank Co.,Ltd. Pledgor: HUNAN BG WELL-POINT ENVIRONMENTAL SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2021980009948 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220923 Granted publication date: 20190201 Pledgee: Changsha Lugu sub branch of China Everbright Bank Co.,Ltd. Pledgor: HUNAN BG WELL-POINT ENVIRONMENTAL SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2021980009948 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Dish tube reverse osmosis membrane cleaning system Effective date of registration: 20220927 Granted publication date: 20190201 Pledgee: Changsha Lugu sub branch of China Everbright Bank Co.,Ltd. Pledgor: HUNAN BG WELL-POINT ENVIRONMENTAL SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2022430000091 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231225 Granted publication date: 20190201 Pledgee: Changsha Lugu sub branch of China Everbright Bank Co.,Ltd. Pledgor: HUNAN BG WELL-POINT ENVIRONMENTAL SCIENCE & TECHNOLOGY CO.,LTD. Registration number: Y2022430000091 |
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