Membrane separation device for recovering nano-scale calcium-magnesium precipitate from saline water

Abstract

The invention relates to the technical field of water treatment and brine recycling, in particular to a membrane separation device for recovering nanoscale calcium and magnesium precipitates from brine, which comprises a filter shell and a plurality of components contained in the shell, the assembly comprises a flange which plays a role in fixing the device and sealing; the middle plate is used for reserving a cavity for suction filtration of the filter membrane; the hollow micro-filtration membrane is fixed between the upper and lower fixed end plates and serves as a filtering main body of the device; the end plates are distributed at the two upper ends of the shell and play a role in fixing the hollow microfiltration membrane; the slag scraping plate is a scraping plate nested on the hollow micro-filtration membrane, can slide between the upper end plate and the lower end plate, and plays a role in scraping solids attached to the surface of the hollow micro-filtration membrane; the propelling screw rod is connected to the scraping plate and is used for controlling the scraping plate to slide up and down; the sealing gasket is arranged between the upper end plate and the shell and around the slag scraping plate and is used for sealing the device; the water inlet and outlet pipe is used for inputting and outputting liquid in the device. Two solid discharge modes including water flow flushing and gas extrusion are enumerated, specifically as shown in an embodiment 1 and an embodiment 2. The problem that viscous micro-nano solids are difficult to recover from water is solved, an automatic control system is arranged for the device, and a certain contribution is made for development of electrolyzed water recovery from a laboratory stage to engineering application.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment brine reuse and relates to a hollow microfiltration membrane separation device for recovering nanometer-level calcium and magnesium precipitates from brine. Background Art

[0002] Traditionally, magnesium resources are obtained through magnesite mining, which consumes significant amounts of non-renewable energy and causes irreversible damage to the environment and landscape. Calcium resources, on the other hand, rely on traditional limestone mining. Calcium and magnesium ions are abundant in various brines, including but not limited to reverse osmosis concentrate from desalination, circulating cooling water, bittern, industrial high-salinity brine, and some lower-concentration, low-salinity brines. Electrochemical "homogeneous nucleation" technology can be used to convert the calcium and magnesium ions in these brines into nanoscale calcium and magnesium precipitates for recycling, such as calcium carbonate (CaCO3), magnesium hydroxide (Mg(OH)2), calcium sulfate (MgSO4), calcium hydroxide (Ca(OH)2), and calcium hydrogen phosphate (CaHPO4). This electrochemical technology not only recycles these wastewaters into usable resources, but also has low carbon emissions and is environmentally friendly, making it a green and efficient recycling technology. During the recycling process, separating the nanoscale calcium and magnesium precipitates from the electrolyte requires the use of a suitable filtration device.

[0003] Existing filtration devices, such as sand filters, activated carbon filters, bag filters, and ceramic filters, primarily target larger particles. However, the electrochemical recovery process for calcium and magnesium precipitates produces nanoscale precipitates, making these filtration devices unsuitable. Filters targeting nanoscale sizes, such as microfiltration, ultrafiltration, and nanofiltration, are primarily designed to filter impurities from water, resulting in a purer, less contaminated effluent. However, during the electrolytic brine recovery process for nanoscale calcium and magnesium precipitation, the target product is solid matter trapped on the filter membrane surface. These precipitates have a high water content, making them difficult to separate. Their high viscosity and small size make them ineffective for separation using conventional filters. Furthermore, conventional reactors use backwashing with water to remove solid impurities trapped on the filter membrane surface. This high-flow backwashing increases the water content of the solid product, making it unsuitable for practical applications.

[0004] In the existing technology, in the utility model patent "A High-Efficiency Centrifugal Sewage Treatment Equipment" (authorization announcement number CN212017047U), the inventor proposed a method of using centrifugal force to remove sewage. The sticky substances in the sewage are trapped on the filter net, and finally the sticky substances are removed by the vibration of the box. This new method realizes the filtration and recovery of sticky substances, but the particle size of the solid substances cannot reach the nanometer level. In the invention patent "Microfiltration Device for Sticky Fish Farming" (publication number CN118985517A), the inventor proposed a microfiltration device for sticky fish farming. The device can achieve micron-level filtration of sticky devices, but by spraying high-temperature water or high-pressure steam onto the filter surface of the microfiltration drum to clean the aqueous mucus adhering to the filter surface, this slag cleaning method increases the water content of the resulting solid product.

[0005] Since the above separation equipment cannot meet the filtering function of micro-nano-scale calcium and magnesium precipitates, it is urgent to invent a new filtering device suitable for the solid-liquid separation of micro-nano-scale calcium and magnesium precipitates produced during the electrolysis of brine. Summary of the Invention

[0006] In order to solve the problem that solid products with low water content cannot be separated from the reaction solution during the process of producing nano-scale magnesium hydroxide and calcium carbonate by electrolysis of water, the present invention develops a hollow microfiltration membrane separation device that can separate nano-scale solid products from the reaction solution without increasing the water content of the solids.

[0007] The technical solution of the present invention:

[0008] A membrane separation device for recovering nano-scale calcium and magnesium precipitates from brine, comprising a housing, a hollow microfiltration membrane, a water inlet, a water outlet, a flushing water inlet, a flushing water outlet, a propulsion screw, a sealing gasket, and a sealing guide;

[0009] The filter housing and the upper end plate are assembled into the outer shell of the membrane separation device through the flange and the middle plate, and the interior of the membrane separation device is a sealed cavity; the upper end plate divides the sealed cavity into an upper sealed cavity and a lower sealed cavity; a sealed cavity is formed between the flange, the middle plate and the upper end plate, which is the upper sealed cavity; through holes are provided around the flange, the middle plate and the upper end plate, and the hole diameter matches the stud model. The studs pass through the above three plates to fix the device and seal the upper sealed cavity; a hollow notch is provided in the center of the middle plate to form a hollow cavity Small holes corresponding to the diameter and spacing of the hollow microfiltration membrane are provided on the upper end plate for the hollow microfiltration membrane to pass through the upper end plate; the hollow microfiltration membrane is radially and evenly arranged in the sealed cavity, and its upper end extends through the small holes on the upper end plate into the hollow notch of the middle plate; an adhesive is applied between the upper end plate and the hollow microfiltration membrane to fix the upper end of the hollow microfiltration membrane and form a seal; water enters the lower sealed cavity from the outside of the hollow microfiltration membrane, and water exits the upper sealed cavity from the hollow part of the hollow microfiltration membrane, and water is pumped out by an external water pump to provide power for filtration;

[0010] The lower end plate is fixed to the bottom of the lower sealed cavity, and the hollow microfiltration membrane passes through the small holes of the lower end plate, fixed and sealed with an adhesive; the scraper plate reciprocates between the upper and lower end plates to scrape off solid precipitation attached to the outer surface of the hollow microfiltration membrane; a water inlet is provided at the lower part of the filter housing for conveying liquid into the membrane separation device; a water outlet is provided at the center of the flange, and an external pump is connected to the outside for extracting liquid; a flushing water inlet and a flushing water outlet are also provided at the lower part of the filter housing, and the heights of the two are equal and both lower than the water inlet, and they are respectively used for the discharge and removal of flushing water under slag cleaning conditions; a slag outlet is provided on the bottom plate of the filter housing for removing solids;

[0011] The inlet water enters the lower sealed cavity of the membrane separation device through the water inlet, is filtered on the outer surface of the hollow microfiltration membrane, and then flows out from the inner surface of the hollow microfiltration membrane. The filtered solid products are retained on the outer surface of the hollow microfiltration membrane, and the solids are scraped off by the scraper and discharged from the membrane separation device. The operation is divided into two working conditions: in the filtration condition, the water inlet and outlet are open, the scraper is located at the upper end of the filter shell, and the slag outlet is closed; in the slag cleaning condition, the water inlet and outlet are closed, the transmission device is started, and the slag outlet is open.

[0012] The flange is provided with an installation opening for the push screw. The top of the push screw is located outside the flange and is used to connect to an external transmission device. The push screw passes through the flange, the middle plate, and the upper end plate, and the lower part is fixed on the scraper plate. Under separation conditions, as the push screw slides up and down, the scraper plate slides up and down to scrape off the sediment attached to the surface of the hollow microfiltration membrane.

[0013] Sealing gaskets and sealing guides are installed at the connections between the advancing screw and the flange, and between the flange and the upper end plate. The sealing gaskets are nested in the sealing guides and are integrally sleeved on the advancing screw. A sealing gasket is provided between the intermediate plate and the filter housing to ensure that the upper and lower sealing cavities are always in a sealed state during the upward and downward movement of the advancing screw.

[0014] Preferably, the spacing between adjacent hollow microfiltration membranes is consistent, ranging from 0.1 mm to 5 cm, which is adjusted according to the size of the device and the amount of water to be treated;

[0015] Preferably, the water inlet flow rate is 0.1 to 10 L / min, and the water inlet flow rate is consistent with the water outlet flow rate;

[0016] Preferably, the pore size of the hollow microfiltration membrane is 1 nm to 10 μm, the outer diameter is 1 mm to 10.5 cm, and the inner diameter is 0.56 mm to 10 cm;

[0017] Preferably, the hollow microfiltration membrane adopts a fiber membrane, such as polyvinylidene fluoride (PVDF) membrane, polyethersulfone (PES) membrane, polypropylene (PP) membrane, polyethylene (PE) membrane, polyacrylonitrile (PAN) membrane, cellulose acetate membrane (CA), inorganic fiber membrane, such as carbon fiber membrane, glass fiber membrane, ceramic membrane, such as aluminum oxide membrane, zirconium oxide membrane, silicon dioxide membrane, silicon carbide membrane, titanium oxide membrane;

[0018] Preferably, the material of the microfiltration device can be organic glass, Teflon, polished steel, or alloy material;

[0019] Preferably, the sealing gasket has a thickness of 0.1 mm to 1 cm and is made of a material such as nitrile rubber, fluororubber, polytetrafluoroethylene, asbestos, leather, metal composite material, or non-metal composite material;

[0020] Preferably, the adhesive is acrylate glue, polyurethane glue, epoxy resin glue or rubber glue.

[0021] The beneficial effects of the present invention are as follows: 1. The present invention completely separates the nano-calcium-magnesium precipitate produced by the electrochemical reaction of brine from the alkaline solution through the hollow microfiltration membrane, thereby achieving the removal of the hardness of the alkaline solution and the recovery of the precipitated product; 2. In the process of recovering the product from the separation device, the present invention can adopt a variety of slag discharge methods, such as discharging the solid product from the reactor by flushing with a small amount of water or by gas compression. Different slag discharge methods can be used to adjust the different moisture content of the product to meet the needs of different situations; 3. The present invention can be equipped with hollow microfiltration membranes of different pore sizes and lengths, which can not only adapt to different water inlet flow rates, but also be suitable for the separation of particles of different sizes; 4. The present invention adopts a mechanical transmission device to scrape the slag, which can realize the automatic operation of the device and has the potential to be put into engineering application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the device according to embodiment 1 of the present invention;

[0023] Figure 2 is a vertical cross-sectional view of the interior of the device according to embodiment 2 of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall structure of the device according to embodiment 2 of the present invention;

[0025] Figure 4 is a vertical cross-sectional view of the interior of the device according to embodiment 2 of the present invention;

[0026] Figure 5 is a schematic diagram of the device in Example 3 of the present invention in a usage scenario;

[0027] In the figure: 1 water outlet; 2 propulsion screw; 3 stud; 4 nut; 5 flushing water inlet; 6 water inlet; 7 flushing water outlet; 8 flange; 9 middle plate; 10 upper end plate; 11 filter housing; 12 hollow microfiltration membrane; 13 scraper plate; 14 lower end plate; 15 bottom plate; 16 sealing guide; 17 sealing gasket; 18 slag outlet; 19 frame; 20 propulsion motor; 21 air inlet. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0029] Example 1

[0030] A membrane separation device for recovering nano-scale calcium and magnesium precipitates from brine, using a flushing and slag removal method, such as Figure 1 、 Figure 2 Shown, including:

[0031] The filter housing 11 is hollow inside and allows brine to flow through;

[0032] Flange 8, used to fix the device body, with holes to reserve installation positions for studs 3 and nuts 4;

[0033] The middle plate 9 is slotted in the middle to form the upper sealing cavity;

[0034] The hollow microfiltration membrane 12 is used to filter the brine injected into the microfiltration housing 11;

[0035] The upper end plate 10 is used to fix the upper end of the hollow microfiltration membrane 12;

[0036] The lower end plate 14 is used to fix the lower end of the hollow microfiltration membrane 12;

[0037] The water outlet 1 is used to discharge the softened water filtered by the filter housing 11;

[0038] A water inlet 6 is used to inject salt water containing solid matter into the filter housing 11;

[0039] A scraper 13 is used to scrape off the solids attached to the outer surface of the hollow microfiltration membrane 12;

[0040] The advancing screw 2 is fixedly connected to the scraper plate 13 and is used as a driving device for the scraper plate;

[0041] Studs 3 and nuts 4 are installed on the flange 8, the middle plate 9 and the upper end plate 10 to fix and seal the device;

[0042] Flushing water inlet 5, used for injecting flushing water;

[0043] The flushing outlet 6 is used to discharge the flushing water and take out the solids separated by the hollow microfiltration membrane;

[0044] The filter housing 11 is fixed to the flange 8, the middle plate 9 and the upper end plate 10 by multiple sets of studs 3 and nuts 4 to form an upper sealed cavity; the water inlet 6 is installed on the side of the filter housing, and its position can be at any position without interfering with the arrangement of other components, and is connected to an external water injection pump; the water outlet 1 is installed at the top of the flange 8 and is externally connected to a water pump; the propulsion screw 2 is connected to an external drive motor, and driven by the motor, drives the scraper 13 to reciprocate between the upper end plate 10 and the lower end plate 14 The flushing water inlet 5 and the flushing water outlet 6 are installed at the lower part of the two sides of the filter membrane shell, below the water inlet 6, the flushing water inlet is externally connected to the water injection pump, and the flushing water outlet is externally connected to the product recovery tank; the hollow microfiltration membrane 12 is installed between the upper end plate 10 and the lower end plate 13, serving as the functional body of the device, and the upper and lower ends are respectively fixed to the upper end plate 10 and the lower end plate 14 by adhesives, and pass through the middle plate 13 to perform solid-liquid separation on the brine entering the filter shell 11.

[0045] Specifically, the device of the present invention is divided into two working conditions when working:

[0046] Under the filtering condition, the valve of the water inlet 6 and the valve of the water outlet 1 are opened; the external water injection pump of the water inlet is turned on, and the external water pump of the water outlet is turned on; the flushing water inlet 5 and the flushing water outlet 6 are closed; the propulsion screw 2 is controlled by the external transmission device, driving the scraper plate 13 to the initial state, close to the upper end plate 10 of the filtering device; the brine mixed with solids and liquids and precipitates is pumped into the water inlet 6 of the device by the water injection pump, enters the filter housing 11, enters from the outside of the hollow microfiltration membrane 12 in the lower sealed cavity, and after being filtered by the hollow microfiltration membrane 12, the brine with solids removed is concentrated from the hollow part of the hollow microfiltration membrane into the upper sealed cavity and discharged from the water outlet. The filtered solid matter is trapped on the surface of the hollow microfiltration membrane 12;

[0047] Under the slag cleaning condition, the water inlet 6 and the water outlet 1 are closed; the water injection pump connected to the water inlet is closed, and the water pump connected to the water outlet is closed; the propulsion screw 2 is controlled by the driver, driving the scraper 13 to be in working state, starting from the upper end plate 10 of the filter device, and transmitting downward until it is close to the lower end plate 14, and stays above the flushing water inlet 5 and the flushing water outlet 6 on the side of the filter shell, scraping off the solid matter trapped on the surface of the hollow microfiltration membrane 12; the scraper 13 stays at the bottom of the filter shell to concentrate the solid matter in the small cavity at the bottom; then the flushing water inlet 5 and the flushing water outlet 6 are opened; the external injection pump connected to the flushing water inlet 5 is opened, and the valve of the product recovery tank connected to the flushing water outlet 6 is opened; the flushing water flushes the small volume sealed cavity formed by the scraper 13, the filter shell 11 and the lower end plate 14, and removes the solid matter accumulated therein from the flushing outlet 6 in the cavity and enters the product recovery tank.

[0048] Example 2

[0049] A membrane separation device for recovering nano-scale calcium and magnesium precipitates from brine, wherein the slag is discharged by gas pressure, such as Figure 3 、 Figure 4 、 Figure 5 As shown, the specific structure is consistent with that of Example 1. The following specifically discusses the differences from Example 1, including:

[0050] The propulsion screw 2 is connected to the propulsion motor 2 at its upper end. The entire propulsion screw 2 passes through the flange 8, the middle plate 9, and the upper end plate 10. The lower end is fixed to the scraper plate 13. The middle of the propulsion screw 2 is hollow and serves as a pipeline for gas to enter from the air inlet 21.

[0051] A first sealing guide 16 is used to seal the connection between the advancing screw 2 and the flange 8;

[0052] A first sealing gasket 17 is used to seal between the guide 16 and the flange 3;

[0053] A second sealing guide 16 is used for sealing the upper end plate and the interior of the filter housing 11;

[0054] A second sealing gasket 17 is used to seal the second sealing guide 16 and the interior of the filter housing 11;

[0055] The third sealing gasket 17 is used to seal between the scraper plate 13 and the filter housing 11, ensuring that the cavity formed between the scraper plate 13, the filter housing 11 and the lower end plate 14 is sealed when the scraper plate 13 is scraping downward in the working state;

[0056] The slag outlet 18 is used to discharge the solid product in the cavity for further collection;

[0057] Frame 19, used to fix the entire microfiltration device in the process system;

[0058] The propulsion motor 20 is used to provide power to the propulsion screw 2 and is controlled by an external driver;

[0059] The air inlet 21 is used to inject air into the sealed cavity when the filter device is in the slag cleaning state;

[0060] The air inlet 21 is installed in the middle of the propulsion motor structure to form a hollow structure, which is connected to the external air intake valve and the air intake pump; the sealing guide 16 is installed on the outside of the propulsion screw 2 to guide the propulsion screw 2 to move in a straight line to prevent the components from deviating due to uneven force, and at the same time ensure that the propulsion screw provides support and positioning for the seal when it moves downward in the slag cleaning condition, so as to reduce the wear of the seal, extend its service life, and ensure the sealing effect; the sealing gasket 17 is installed inside the sealing guide 16 to prevent the leakage of the medium at the connection part, and also plays the role of buffering, shock absorption and gap adjustment. The sealing gasket 17 and the sealing guide 16 cooperate to ensure the sealing of the entire cavity of the entire propulsion screw 2 during the sliding process; the slag outlet 18 is located at the bottom of the end plate, and is used to discharge the solid product separated by the filter shell 11 out of the device. It is closed under the filtering condition and opened under the slag cleaning condition.

[0061] Specifically, the device of the present invention is divided into two working conditions when working:

[0062] Under filtering conditions, the water inlet 21 and the water outlet 16 are open; the water inlet is connected to an external water injection pump and the water outlet is connected to an external water extraction pump; the air inlet 21 is closed; the propulsion screw 15 is controlled by an external driver, driving the scraper plate 13 to an initial state, close to the upper end plate 10 of the filter device; the reacted brine is pumped into the device water inlet 21 by the water inlet pump, enters the filter housing 11, and is filtered by the hollow microfiltration membrane 12 in the sealed cavity before being discharged from the water outlet 1, and the filtered solid matter is trapped on the surface of the hollow microfiltration membrane 12;

[0063] Under the slag cleaning condition, the valve of the water inlet 6 and the valve of the water outlet 1 are closed; the external water injection pump of the water inlet is closed, and the external water extraction pump of the water outlet is closed; the propulsion screw 2 is controlled by the transmission device, driving the scraper plate 13 to be in working state, starting from the upper end plate 10 of the filter device, and transmitting downward until it is close to the position of the lower end plate 14, scraping off the solid matter trapped on the surface of the hollow microfiltration membrane 12; the scraper plate 13 stays at the bottom of the filter shell to concentrate the solid matter at the bottom; at this time, the air inlet valve of the air inlet pipe 21 located at the center of the propulsion screw 2 is opened, and the external aeration equipment is turned on, and gas is input into the air inlet pipe 21, and transported to the inside of the sealed cavity from the air inlet hole in the center of the scraper plate 13; due to the increased air pressure in the sealed cavity, the solid matter trapped in the cavity is compressed to the bottom; at this time, the slag outlet 18 is opened, and the air pressure in the sealed cavity is used to discharge the solid product from the filter device and collected by the external collection device.

Claims

1. A membrane separation device for recovering nano-scale calcium and magnesium precipitates from brine, characterized in that: The membrane separation device comprises a shell, a hollow microfiltration membrane, a water inlet, a water outlet, a flushing water inlet, a flushing water outlet, a sealing gasket, and a sealing guide; The filter shell and the upper end plate are assembled into the outer shell of the membrane separation device through the flange and the middle plate, and the interior of the membrane separation device is a sealed cavity; wherein the upper end plate divides the sealed cavity into an upper sealed cavity and a lower sealed cavity; a sealed cavity is formed between the flange, the middle plate and the upper end plate, which is the upper sealed cavity; through holes are provided around the flange, the middle plate and the upper end plate, and the hole diameter matches the stud model, and the studs pass through the above three plates for fixing the device and sealing the upper sealed cavity; a hollow notch is provided in the center of the middle plate to form a hollow cavity; small holes corresponding to the diameter and spacing of the hollow microfiltration membrane are provided on the upper end plate for the hollow microfiltration membrane to pass through the upper end plate; the hollow microfiltration membrane is radially and evenly arranged in the sealed cavity, and its upper end extends through the small holes on the upper end plate into the hollow notch of the middle plate; an adhesive is applied between the upper end plate and the hollow microfiltration membrane to fix the upper end of the hollow microfiltration membrane and form a seal; The lower end plate is fixed to the bottom of the lower sealing cavity, and the hollow microfiltration membrane passes through the small hole of the lower end plate, fixed and sealed with an adhesive; the scraper plate reciprocates between the upper end plate and the lower end plate to scrape off the solid precipitation attached to the outer surface of the hollow microfiltration membrane; a water inlet is provided at the lower part of the filter housing for conveying liquid into the membrane separation device; a water outlet is provided at the center of the flange, and an external pump is connected to the outside for extracting liquid; a flushing water inlet and a flushing water outlet are also provided at the lower part of the filter housing, and the heights of the two are equal and both are lower than the water inlet, and are respectively used for the discharge and removal of flushing water under slag cleaning conditions; a slag outlet is provided at the bottom plate of the filter housing for removing solids.

2. The membrane separation device according to claim 1, characterized in that The incoming water enters the lower sealed cavity of the membrane separation device through the water inlet, that is, the water enters the outside of the hollow microfiltration membrane; after being filtered on the outer surface of the hollow microfiltration membrane, the water is pumped outward from the hollow part of the hollow microfiltration membrane through an external water pump, and the filtered solid products are retained on the outer surface of the hollow microfiltration membrane. The solids are scraped off by the scraper and discharged from the membrane separation device; the operation is divided into two working conditions: under the filtration condition, the water inlet and outlet are open, the scraper is located at the upper end of the filter shell, and the slag outlet is closed; under the slag cleaning condition, the water inlet and outlet are closed, the transmission device is started, and the slag outlet is open.

3. The membrane separation device according to claim 1, characterized in that The membrane separation device also includes a push screw. A mounting port for the push screw is opened on the flange. The top of the push screw is located outside the flange and is used to connect to an external transmission device. The push screw passes through the flange, the middle plate, and the upper end plate, and the lower part is fixed on the scraper plate. Under separation conditions, as the push screw slides up and down, the scraper plate slides up and down to scrape off the sediment attached to the surface of the hollow microfiltration membrane.

4. The membrane separation device according to claim 1, characterized in that Sealing gaskets and sealing guides are installed at the connections between the advancing screw and the flange, and between the flange and the upper end plate. The sealing gaskets are nested in the sealing guides and are integrally sleeved on the advancing screw. A sealing gasket is arranged between the intermediate plate and the filter housing to ensure that the upper sealing cavity and the lower sealing cavity are always in a sealed state during the up and down movement of the advancing screw.

5. The membrane separation device according to claim 1, characterized in that The spacing between adjacent hollow microfiltration membranes is consistent, ranging from 0.1 mm to 5 cm, and is adjusted according to the size of the device and the amount of water to be treated.

6. The membrane separation device according to claim 1, characterized in that The pore size of the hollow microfiltration membrane is 1nm~10μm, the outer diameter is 1mm~10.5cm, and the inner diameter is 0.56mm~10cm; the hollow microfiltration membrane adopts fiber membrane or inorganic fiber membrane.

7. The membrane separation device according to claim 1, characterized in that The water inlet flow rate is 0.1~10L / min, and the water inlet flow rate is consistent with the water outlet flow rate.

Images