CN112225337A - High-turbidity surface water precipitation ultrafiltration treatment equipment - Google Patents
High-turbidity surface water precipitation ultrafiltration treatment equipment Download PDFInfo
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- CN112225337A CN112225337A CN202011312337.8A CN202011312337A CN112225337A CN 112225337 A CN112225337 A CN 112225337A CN 202011312337 A CN202011312337 A CN 202011312337A CN 112225337 A CN112225337 A CN 112225337A
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- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 65
- 239000002352 surface water Substances 0.000 title claims abstract description 64
- 238000001556 precipitation Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 122
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims description 50
- 239000012528 membrane Substances 0.000 claims description 32
- 238000011001 backwashing Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims 8
- 238000013022 venting Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 47
- 238000000034 method Methods 0.000 description 8
- 238000000151 deposition Methods 0.000 description 6
- 230000001112 coagulating effect Effects 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005234 chemical deposition Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F2001/007—Processes including a sedimentation step
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
本发明的高浊度地表水沉淀超滤处理设备，属于过滤装置的技术领域，解决现有技术产品过滤高浊度地表水成本高的技术问题。其包括：水箱、供水泵组件、抽水泵组件和旋流沉沙组件，其中：所述水箱内安装有支撑网架，所述支撑网架上表面和下表面分别安装有浸没式超滤组件和旋流沉沙组件，所述旋流沉沙组件能够将高浊度地表水输送至所述水箱内，并将高浊度地表水以旋流的方式排出；所述浸没式超滤组件能够对高浊度地表水进行过滤；所述供水泵组件，用于向所述水箱内输送高浊度地表水；所述抽水泵组件，用于将所述浸没式超滤组件过滤后的水进行回收，并向所述浸没式超滤组件提供过滤动力。本发明用以满足高浊度地表水过滤过滤成本低的要求。
The high-turbidity surface water precipitation ultrafiltration treatment equipment of the invention belongs to the technical field of filtering devices, and solves the technical problem of the high cost of filtering high-turbidity surface water in the prior art. It includes: a water tank, a water supply pump assembly, a pumping pump assembly and a swirl sedimentation assembly, wherein: a supporting grid is installed in the water tank, and an immersed ultrafiltration assembly and a submerged ultrafiltration assembly are respectively installed on the upper surface and the lower surface of the supporting grid. The cyclone sedimentation assembly, which can transport high-turbidity surface water into the water tank, and discharge the high-turbidity surface water in a swirling manner; the submerged ultrafiltration assembly can The high turbidity surface water is filtered; the water supply pump assembly is used to transport the high turbidity surface water into the water tank; the suction pump assembly is used to recover the water filtered by the submerged ultrafiltration assembly , and provide filtration power to the submerged ultrafiltration assembly. The present invention is used to meet the requirement of low cost for filtration of high turbidity surface water.
Description
Technical Field
The invention belongs to the technical field of water filtering devices, and particularly relates to high-turbidity surface water precipitation ultrafiltration treatment equipment.
Background
The traditional mode of filtering high turbidity surface water includes, is natural deposition, chemical deposition and multistage coagulating sedimentation respectively, wherein: the water tank required by the natural deposition method is large, for example, the water tank with large area is naturally filtered and then pumped; chemical deposition, namely adding a chemical agent, and depositing large particles in surface water by a chemical method, wherein the large particles not only influence the water quality, but also have high cost; multistage coagulating sedimentation, like the two-stage type, two-stage coagulating sedimentation mainly is to the very big water of sand content, and one-level coagulating sedimentation is not enough to reach the requirement of getting rid of the sand content, so generally add one-level or multistage sedimentation tank before this for get rid of most solid suspended solid, then reach through coagulating sedimentation again, adopt the horizontal, the sedimentary sand of swash plate is difficult for discharging, need adopt large-scale mechanical device to arrange sand, causes economic cost higher.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide high-turbidity surface water precipitation ultrafiltration treatment equipment, which solves the technical problem that the cost for filtering high-turbidity surface water by using a product in the prior art is high. The present disclosure has numerous technical advantages, as described in detail below.
It includes: water tank, water supply pump subassembly, water pumping pump subassembly and the heavy husky subassembly of whirl, wherein:
the water tank is internally provided with a supporting net rack, the upper surface and the lower surface of the supporting net rack are respectively provided with an immersed ultrafiltration assembly and a cyclone sand settling assembly, the cyclone sand settling assembly can convey high-turbidity surface water into the water tank and separate the high-turbidity surface water in a cyclone mode, the high-turbidity surface water is surface water with high sand content, and the immersed ultrafiltration assembly can separate sand from water of the surface water subjected to preliminary natural precipitation so as to achieve the filtering effect of industrial water;
the water supply pump assembly is used for conveying high-turbidity surface water into the water tank;
the water pumping pump assembly is used for recovering the water filtered by the immersed ultrafiltration assembly and providing filtering power for the immersed ultrafiltration assembly.
The beneficial effects of the product provided by the scheme are at least as follows:
high turbidity surface water refers to surface water with high sand content. When the surface water in the water tank is filled with the water capable of submerging at least the immersed ultrafiltration assembly, the rotational flow sand settling assembly conveys high-turbidity surface water to the water tank, sand-water separation is carried out in a rotational flow mode, the filtering efficiency of the immersed ultrafiltration assembly can be increased after the water is separated in the rotational flow mode, anti-blocking and anti-sticking (sand or other magazines are stuck on the immersed ultrafiltration assembly) are carried out, the surface water with larger sand content is filtered into muddy water and clear water, the sand is stuck or adsorbed or accumulated (in the process of sinking) in the rotational flow mode, the sand deposition rate is accelerated, and therefore the bottom of the water tank is preferable and is arranged in a conical structure, the sand water can be conveniently discharged, and the energy consumption of the sand pump can be greatly reduced.
The cyclone sand settling assembly filters surface water with large sand content into muddy water and clear water, sand is deposited downwards, and clear water naturally floats up, namely, the filtration efficiency of the immersed ultrafiltration assembly is improved, the immersed ultrafiltration assembly filters the clear water, and the water pumping assembly is communicated with the immersed ultrafiltration assembly. Therefore, an efficient method and equipment without chemical addition are provided for high-turbidity surface water treatment, and the problem that the water quality is influenced by using a medicament is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic structural view of a membrane according to the present invention;
wherein: 1. a water tank; 11. an immersed ultrafiltration module; 12. an overflow pipe; 13. a sand discharge pipe; 2. a pump assembly; 3. a water supply pump assembly; 41. a swirler water supply pump; 42. a swirler; 111. and (4) filtering the membrane.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are only a few embodiments of the invention, and are not exhaustive. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention.
The high-turbidity surface water sedimentation ultrafiltration treatment device shown in figure 1 comprises: water tank 1, feed pump subassembly 3, suction pump subassembly 2 and the heavy husky subassembly of whirl, wherein:
a supporting net rack is installed in the water tank 1, the interface of the supporting net rack and the water tank 1 is the same, an immersed ultrafiltration component 11 and a rotational flow sand settling component are installed on the upper surface and the lower surface of the supporting net rack respectively, the rotational flow sand settling component can convey high-turbidity surface water into the water tank 1 and discharge the high-turbidity surface water in a rotational flow mode, the contact area of the immersed ultrafiltration component 11 and the water is increased in the rotational flow purpose, the immersed ultrafiltration component 11 can filter the high-turbidity surface water, and the high-turbidity surface water refers to surface water with high sand content;
the cyclone sand settling assembly comprises a cyclone 42 (preferably, a hollow shell of cyclone) and a pump communicated with the cyclone 42, and has the functions of separating high-turbidity surface water by using water inlet pressure cyclone, naturally settling, and reducing the water content of discharged sludge in a cyclone mode and a gravity concentration mode to help the high-turbidity surface water, thereby reducing the water consumption rate of discharged sludge. When the water tank 1 is fully loaded, the pump supplies high-turbidity surface water to be conveyed to the cyclone 42, the cyclone 42 discharges the high-turbidity surface water in a cyclone mode, the purpose of the cyclone is to increase the deposition efficiency of sand, and the immersed ultrafiltration module 11 can filter the high-turbidity surface water;
a water supply pump assembly 3 for supplying high turbidity surface water into the water tank 1, the water supply pump assembly 3 supplying water into the water tank 1 to full load, for example, using a water supply pump and a pump holder in the prior art;
and the water pump assembly 2 is used for recovering the water filtered by the immersed ultrafiltration assembly 11 and providing filtering power for the immersed ultrafiltration assembly 11.
When the surface water in the water tank 1 is filled with the water capable of submerging at least the submerged ultrafiltration component 11, the rotational flow sand settling component conveys high-turbidity surface water into the water tank 1, sand-water separation is carried out in a rotational flow mode, the filtering efficiency of the submerged ultrafiltration component 11 can be increased after water is separated in the rotational flow mode, blocking and sticking are prevented (sand or other magazines are stuck on the submerged ultrafiltration component), the surface water with larger sand content is filtered into muddy water and clear water, the sand is stuck or adsorbed or accumulated (in the process of sinking) in the rotational flow mode, the sand deposition rate is accelerated, and therefore, the bottom of the water tank is preferably arranged in a conical structure, sand water can be conveniently discharged, and the energy consumption of the sand pump can be greatly reduced.
During operation, the water pumping pump assembly 2 is opened, filtered water is pumped from the immersed ultrafiltration assembly 11, and the water pumping pump assembly 2 provides suction to increase the filtering speed of the immersed ultrafiltration assembly 11. And the water at the bottom of the water tank 1 is deposited in a natural mode due to the fact that the water is far away from the rotational flow sand settling component. On the whole, the equipment of this scheme will naturally deposit and the effectual combination of mechanical filtration, make things convenient for the emission of sandy water, increase the filter effect. The submerged ultrafiltration module 11, which may be an ultrafiltration submerged ultrafiltration module or a filtration submerged ultrafiltration module, performs filtration according to different requirements.
The cyclone sedimentation component filters surface water with large sand content into muddy water and clean water, sand is deposited downwards, and the clean water naturally floats upwards, namely, the filtration efficiency of the immersed ultrafiltration component is improved, the immersed ultrafiltration component filters the clean water, and the water pumping pump component is communicated with the immersed ultrafiltration component. Therefore, an efficient method and equipment without chemical addition are provided for high-turbidity surface water treatment, and the problem that the water quality is influenced by using a medicament is avoided.
The pump that the heavy husky subassembly of whirl is linked together including the whirl casing and with the whirl casing, and the whirl casing sets up with one end open structure, preferably, arc or helical structure setting, and the open end is downward and is being kept away from the open end and communicate with the pump mutually, and the breather pipe is installed to the non-open end, and the breather pipe extends to outside the water tank top surface for air in the row whirl casing, the air is too much influences the whirl efficiency of high turbidity surface water, and influence the efficiency of sand whirl deposit. When water tank 1 is full-load, the pump supplies high turbidity surface water and carries to in the whirl casing, and the non-open end position of neighbor supplies water, and high turbidity surface water gets into the whirl casing, under the effect of pump, along the internal surface whirl of circumference in the whirl casing, until the discharge whirl casing, theoretical model does, goes out water and forms swirl or whirl for the sand can pile up or the collision forms sand group, and the weight of increase sand is in order to form the group, thereby sinks with higher speed, improves the accumulational efficiency of sand.
As the embodiment provided by the present case, the overflow pipe 12 and the sand discharge pipe 13 are respectively disposed at the side and the bottom of the water tank 1, and the sand discharge pipe 13 can discharge the sand-water mixture in the water tank 1, for example, the sand water deposited at the bottom of the water tank 1 is discharged through the sand discharge pipe 13.
As a specific embodiment provided in the present disclosure, the submerged ultrafiltration module 11 includes a frame, a plurality of filtration membranes 111 are installed in the frame, the filtration membranes 111 are disposed in an open structure at one end, and the other end is communicated with the water pump module 2 for recovering water filtered by the submerged ultrafiltration module 11. For example, the immersed ultrafiltration module 11 is provided with a hollow plate, the hollow plate is communicated with the open end of the filtration membrane 111, the water pump module 2 comprises a vacuum pump, the vacuum pump is communicated with the hollow plate, the vacuum pump provides suction force during the process of vacuumizing, and the filtration efficiency of the filtration membrane 111 is increased.
Further, the submerged ultrafiltration module further comprises a perforated pipe (not labeled in the figure) arranged at the bottom of the frame, and the perforated pipe is communicated with an air supply device outside the water tank 1;
the open end of filtration membrane 111 with install hollow slab intercommunication in the frame, the non-open end is fixed in the frame bottom surface, open end and hollow slab intercommunication, adopt big resistance distribution mode at the perforated pipe, make the membrane silk shakes at the horizontal direction, and the shake can get rid of and be stained with attached silt, avoids the micropore of filtration membrane circumference is blockked up.
It should be noted that the hollow plates may be replaced by headers communicating with the open ends of the filtration membranes.
As an embodiment provided in the present disclosure, a plurality of filtering membranes 111 are installed in the submerged ultrafiltration module 11, and as shown in fig. 2, the filtering membranes 111 are circumferentially provided with arc-shaped and/or polygonal micro-pores to prevent large-particle impurities from entering the filtering membranes 111. The filtration membrane 111 may be a high filtration membrane 111 or an ultrafiltration membrane or a general filtration membrane 111, depending on the industrial water standard. Lipid substances are filled between the outer circle and the inner circle of the filtering membrane 111, and the arc-shaped or broken line micropores are arranged in the circumferential direction and have the function of preventing particles from being bonded, blocked and entering the membrane.
As a specific embodiment provided in the present disclosure, the swirling flow sand settling component includes a vent pipe, which extends out of the top surface of the water tank 1 and is provided with an extending section for discharging air inside the swirling flow sand settling component during operation, so as to ensure the operating efficiency of the swirler 42.
As a specific embodiment provided by the scheme, the concentration of the high-turbidity surface water is more than or equal to 100kg/m3. As in many countries, the standards of turbidity measurement and the preparation of standard solutions are not standardized, and the turbidity units used in China are mg/L or FTU. mg/L is defined as: GB5750-1985, corresponding to 1mg of diatomaceous earth of a given particle size, gives a turbidity of 1 degree in 1000ml of water. The device is mainly used in northwest areas due to available water resourcesThe method is not abundant, and more tap water is prevented from being used in industry by filtering the turbidity water of 1000 mg/L.
It should be noted that the submerged ultrafiltration module 11 is removably connected to the support frame to facilitate replacement and maintenance.
In the cleaning process of the above device, for example, the membrane is made of acid-resistant and alkali-resistant materials, a backwashing water inlet pipe and a drainage pipe can be arranged on the water tank 1 for cleaning, or a water suction pump in the water suction pump assembly 2 is used for backwashing. Or, a backwashing device in the prior art is used for backwashing, and a backwashing water inlet and outlet are arranged on the water tank. Or the pump in the water pumping pump assembly is reversed to carry out backwashing on the filtering membrane.
The products provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the invention without departing from the inventive concept, and those improvements and modifications also fall within the scope of the claims of the invention.
Claims (10)
1. The utility model provides a high turbidity surface water deposits ultrafiltration treatment facility which characterized in that includes: water tank, water supply pump subassembly, water pumping pump subassembly and the heavy husky subassembly of whirl, wherein:
a supporting net rack is installed in the water tank, an immersed ultrafiltration assembly and a rotational flow sand settling assembly are respectively installed on the upper surface and the lower surface of the supporting net rack, the rotational flow sand settling assembly can convey high-turbidity surface water into the water tank, and the high-turbidity surface water is subjected to sand-water separation in a rotational flow mode; the immersed ultrafiltration module can filter high-turbidity surface water;
the water supply pump assembly is used for conveying high-turbidity surface water into the water tank;
the water pumping pump assembly is used for recovering water filtered by the immersed ultrafiltration assembly and providing filtering power for the immersed ultrafiltration assembly, and/or is used for backwashing of the immersed ultrafiltration assembly.
2. The ultrafiltration treatment apparatus for high turbidity surface water sediment according to claim 1, wherein an overflow pipe and a sand discharge pipe are respectively provided at the side and the bottom of the water tank, and the sand discharge pipe can discharge the sand-water mixture in the water tank.
3. The high turbidity surface water sediment ultrafiltration treatment apparatus of claim 1, wherein said cyclone sand sediment module comprises a cyclone housing and a pump in communication with said cyclone housing, said cyclone housing being arranged in an open-ended configuration with an open end facing downward and in communication with the pump at a location remote from the open end, wherein:
when the water tank is fully loaded, the pump supplies high-turbidity surface water to be conveyed to the rotational flow shell, and the rotational flow shell performs sand-water separation on the high-turbidity surface water in a rotational flow mode.
4. The high-turbidity surface water sediment ultrafiltration treatment equipment as claimed in claim 1, wherein the submerged ultrafiltration module comprises a frame, a plurality of filtration membranes are installed in the frame, the filtration membranes are arranged in an open structure at one end, and the other end of the filtration membranes is communicated with the water pump module and used for recovering water filtered by the submerged ultrafiltration module.
5. The high turbidity surface water sediment ultrafiltration treatment device of claim 4, wherein said submerged ultrafiltration module further comprises a perforated tube mounted at the bottom of said frame, said perforated tube being in communication with an air supply outside said water tank;
the open end of the filtering membrane is communicated with a hollow plate arranged in the frame, and the non-open end of the filtering membrane is fixed on the bottom surface of the frame; the perforated pipe adopts a high-resistance air distribution mode, so that the filtering membrane shakes to remove attached silt, and the blockage of the circumferential micropores of the filtering membrane is avoided.
6. The high turbidity surface water sediment ultrafiltration treatment apparatus of claim 4, wherein a hollow plate is installed in said frame, said hollow plate being in communication with the open end of said filtration membrane.
7. The high-turbidity surface water sedimentation ultrafiltration treatment apparatus according to claim 1, wherein a plurality of filtration membranes are installed in the submerged ultrafiltration module, and the filtration membranes are circumferentially provided with arc-shaped and/or polygonal line micropores so as to prevent large-particle impurities from entering the filtration membranes.
8. The apparatus of claim 1, wherein the cyclone sand-settling module comprises a vent pipe extending above the top surface of the tank and leaving an extended section for venting air from the inside of the cyclone sand-settling module during operation.
9. The high turbidity surface water sediment ultrafiltration treatment apparatus of claim 1, wherein the concentration of said high turbidity surface water is greater than or equal to 100KG/m3。
10. The apparatus for the ultrafiltration treatment of high turbidity surface water sediment according to claim 1, wherein the bottom of the water tank is arranged in a conical structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011312337.8A CN112225337A (en) | 2020-11-20 | 2020-11-20 | High-turbidity surface water precipitation ultrafiltration treatment equipment |
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| CN202011312337.8A CN112225337A (en) | 2020-11-20 | 2020-11-20 | High-turbidity surface water precipitation ultrafiltration treatment equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113104944A (en) * | 2021-04-27 | 2021-07-13 | 甘肃朗乾环境科学研究有限公司 | Physical precipitation membrane separation device |
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Application publication date: 20210115 |