Electronic cleaning oily wastewater treatment device

Abstract

The utility model provides a treatment device for electronic cleaning oily wastewater, and relates to the technical field of water treatment. The utility model provides a treatment device for electronic cleaning oily wastewater. The treatment device comprises an adjusting tank, an air flotation device, a graphene filter element, a ceramic membrane separation device, a first-stage nanofiltration device, a second-stage nanofiltration device, a reverse osmosis device and an MVR (mechanical vapor recompression) evaporation device. Through cooperation of the air flotation device, the graphene filter element and the ceramic membrane separation device, about 99.76% of oil in the electronic cleaning oily wastewater can be removed; then producing water is obtained through the first-stage nanofiltration device and the reverse osmosis device, salt and producing water are obtained through the second-stage nanofiltration device and the MVR evaporation device, and treatment of the electronic cleaning oily wastewater is achieved. The treatment device is simple to operate, low in cost, high in produced water quality, capable of reaching the recycling standard, capable of achieving zero emission, energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a treatment device for oily wastewater from electronic cleaning. Background Art

[0002] The production of electronics-related products requires ultrapure water for cleaning, along with the addition of various chemicals. Electronic equipment also contains significant amounts of oil, some of which is washed away during the cleaning process. This wastewater contains significant amounts of oily substances, acids, alkalis, copper, surfactants, and organic solvents. Depending on the type of product and process, it may also contain toxic and hazardous substances such as tin, lead, cyanide, hexavalent chromium, and trivalent chromium. The main characteristics of electronics cleaning wastewater include large volumes, complex pollutant compositions, high levels of contaminants, poor biodegradability, and high levels of ammonia, nitrogen, and inorganic salts. During wastewater treatment, heavy metal ions are present in the wastewater. These pollutants are highly toxic, polluting, and difficult to biodegrade. Their indiscriminate discharge poses significant risks to the ecological environment and human health.

[0003] There are many methods for treating electronic wastewater, mainly categorized as follows. Chemical precipitation, or neutralization precipitation, involves adding reagents to chemically transform specific pollutants in the waste, causing them to precipitate through flocculation. Redox methods often involve oxidation, iron-carbon oxidation, and electrolysis. Solvent extraction separation is used when concentrations are high or when solvents need to be recycled. Energy consumption and cost must be considered when selecting extraction methods. Adsorption occurs during the pigment removal process, relying on the pores on the surface of granular materials to adsorb pollutants and purify the wastewater. Membrane separation technology relies on the pore size of the surface membrane to achieve filtration. This differs from biofilm methods, which are primarily used for microbial degradation. Ion exchange is often used in electrolysis reactions to purify pollutants. Biological treatment methods include bioflocculation, bioadsorption, and biochemistry.

[0004] However, these treatment processes are complicated and require high technical skills from sewage treatment workers. The dosage of chemicals needs to be constantly adjusted based on experience. If one is not careful, the quality of the effluent will be affected. In addition, the cost is high. The quality of the treated water is poor and cannot meet the reuse standards, so it can only be discharged, which is a waste of water resources.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a device for treating oily wastewater from electronic cleaning to solve the above technical problems.

[0007] In order to achieve the above objectives, the following technical solutions are adopted:

[0008] In a first aspect, the utility model provides a treatment device for oily wastewater from electronic cleaning, comprising a regulating tank, an air flotation device, a graphene filter element, a ceramic membrane separation device, a first-stage nanofiltration device, a second-stage nanofiltration device, a reverse osmosis device, and an MVR evaporation device;

[0009] Along the water treatment direction, the regulating tank, the air flotation device, the graphene filter element, the ceramic membrane separation device, the first-stage nanofiltration device and the reverse osmosis device are connected in sequence;

[0010] The water inlet of the flotation device is connected to the drain outlet of the regulating tank, and is used to flotate the wastewater from the regulating tank to preliminarily remove oil and suspended matter in the wastewater;

[0011] The water inlet of the graphene filter element is connected to the water outlet of the flotation device to further remove oil and particulate matter in the wastewater;

[0012] The water inlet of the ceramic membrane separation device is connected to the water outlet of the graphene filter element, which is used to deeply remove oil and particulate matter from the wastewater;

[0013] The water inlet of the first-stage nanofiltration device is connected to the water outlet of the ceramic membrane separation device, the water outlet is connected to the water inlet of the reverse osmosis device, and the concentrate outlet is connected to the water inlet of the second-stage nanofiltration device;

[0014] The concentrated water outlet of the reverse osmosis device is connected to the water inlet of the first-stage nanofiltration device;

[0015] The water outlet of the second-stage nanofiltration device is communicated with the water inlet of the first-stage nanofiltration device, and the concentrated water outlet is communicated with the water inlet of the MVR evaporation device.

[0016] As a further technical solution, an agitator is provided in the regulating tank;

[0017] The agitator is used for homogenizing the wastewater.

[0018] As a further technical solution, the regulating tank is further provided with a coarse grid;

[0019] The coarse screen is used to intercept large suspended particles in the wastewater.

[0020] As a further technical solution, a sludge thickening tank is also included;

[0021] The sludge concentration tank is communicated with the graphene filter element and the ceramic membrane separation device respectively, and is used to collect backwash water from the graphene filter element and the ceramic membrane separation device, as well as scum generated by the flotation device.

[0022] As a further technical solution, a filter press is also included;

[0023] The filter press is communicated with the sludge thickening tank and is used for performing filter press treatment on the sludge in the sludge thickening tank.

[0024] As a further technical solution, the water outlet of the filter press is connected to the water inlet of the regulating tank.

[0025] As a further technical solution, a nanofiltration water pool is further arranged between the water inlet of the first-stage nanofiltration device and the water production port of the ceramic membrane separation device, the concentrate water port of the reverse osmosis device, and the water production port of the second-stage nanofiltration device; the nanofiltration water pool is used to collect wastewater from the water production port of the ceramic membrane separation device, the concentrate water port of the reverse osmosis device, and the water production port of the second-stage nanofiltration device, and provide the collected wastewater to the first-stage nanofiltration device.

[0026] As a further technical solution, it also includes a water production pool;

[0027] The water inlet of the water production pool is communicated with the water production port of the reverse osmosis device and the water production port of the MVR evaporation device respectively.

[0028] As a further technical solution, the pore size of the graphene filter element is 1-5 μm.

[0029] As a further technical solution, the membrane pore size of the ceramic membrane separation device is 0.1-0.2 μm.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This utility model provides a device for treating oily wastewater from electronic cleaning. By combining an air flotation device, a graphene filter element, and a ceramic membrane separation device, it can remove approximately 99.76% of the oil in the wastewater. Water is then produced through a first-stage nanofiltration device and a reverse osmosis device, and salt and water are obtained through a second-stage nanofiltration device and an MVR evaporation device, effectively treating the oily wastewater. This device is simple to operate, highly automated, and requires minimal operator intervention. It is also cost-effective for treating oily wastewater from electronic cleaning. The produced water is high-quality, meets reuse standards, and can be recycled, achieving zero emissions and energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 The device for treating oily wastewater from electronic cleaning provided in Example 1 of the present utility model;

[0034] Figure 2 This is a device for treating oily wastewater from electronic cleaning provided in Example 2 of the present utility model.

[0035] Icons: 1-equalization tank; 2-flotation device; 3-graphene filter element; 4-ceramic membrane separation device; 5-first-stage nanofiltration device; 6-second-stage nanofiltration device; 7-reverse osmosis device; 8-MVR evaporation device; 9-sludge thickening tank; 10-filter press; 11-nanofiltration water tank; 12-water production tank. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention will be described in detail with reference to the embodiments and examples. However, those skilled in the art will understand that the following embodiments and examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0037] In the first aspect, the utility model provides a device for treating oily wastewater from electronic cleaning, such as Figure 1 or Figure 2 As shown, it includes a regulating tank 1, an air flotation device 2, a graphene filter element 3, a ceramic membrane separation device 4, a first-stage nanofiltration device 5, a second-stage nanofiltration device 6, a reverse osmosis device 7 and an MVR evaporation device 8;

[0038] Along the water treatment direction, the regulating tank 1, the air flotation device 2, the graphene filter element 3, the ceramic membrane separation device 4, the first-stage nanofiltration device 5 and the reverse osmosis device 7 are connected in sequence;

[0039] The regulating tank 1 is used to maintain water quality stability and buffer incoming water;

[0040] The water inlet of the flotation device 2 is connected to the drain outlet of the regulating tank 1, and is used to flotate the wastewater from the regulating tank 1 to preliminarily remove oil and suspended matter in the wastewater;

[0041] The water inlet of the graphene filter element 3 is connected to the water outlet of the flotation device 2 to further remove oil and particulate matter in the wastewater;

[0042] The water inlet of the ceramic membrane separation device 4 is connected to the water outlet of the graphene filter element 3, which is used to deeply remove oil and particulate matter in the wastewater;

[0043] The water inlet of the first-stage nanofiltration device 5 is connected to the water outlet of the ceramic membrane separation device 4, the water outlet is connected to the water inlet of the reverse osmosis device 7, and the concentrated water outlet is connected to the water inlet of the second-stage nanofiltration device 6;

[0044] The concentrated water outlet of the reverse osmosis device 7 is connected to the water inlet of the first-stage nanofiltration device 5;

[0045] The water outlet of the second-stage nanofiltration device 6 is communicated with the water inlet of the first-stage nanofiltration device 5 , and the concentrated water outlet is communicated with the water inlet of the MVR evaporation device 8 .

[0046] It should be noted that the graphene filter element in this utility model, due to the introduction of graphene material, has better mechanical strength and anti-pollution ability, especially excellent in toughening strength, and can operate stably in more harsh environmental conditions, such as strong acid and strong alkaline environments. This graphene filter element is commercially available.

[0047] Ceramic membranes offer excellent high-temperature tolerance and chemical stability, making them suitable for industrial processes requiring high-temperature treatment and applications requiring hygienic conditions. Ceramic membranes also feature a narrow pore size distribution and high separation efficiency, enabling more precise filtration. This utility model effectively improves the equipment's pollution resistance, treatment efficiency, and produced water quality through the combination of a graphene ceramic filter element and ceramic membrane.

[0048] This utility model provides a device for treating oily wastewater from electronic cleaning. By combining an air flotation device, a graphene filter element, and a ceramic membrane separation device, it can remove approximately 99.76% of the oil in the wastewater. Water is then produced through a first-stage nanofiltration device and a reverse osmosis device, and salt and water are obtained through a second-stage nanofiltration device and an MVR evaporation device, effectively treating the oily wastewater. This device is simple to operate, highly automated, and requires minimal operator intervention. It is also cost-effective for treating oily wastewater from electronic cleaning. The produced water is high-quality, meets reuse standards, and can be recycled, achieving zero emissions and energy conservation and environmental protection.

[0049] In some optional embodiments, a stirrer is provided in the regulating tank 1;

[0050] The agitator is used to homogenize the wastewater to maintain the stability of the oily wastewater from electronic cleaning.

[0051] In some optional embodiments, the regulating tank 1 is further provided with a coarse grid;

[0052] The coarse screen is used to intercept large suspended particles in the wastewater.

[0053] In some optional embodiments, a sludge thickening tank 9 is further included;

[0054] The sludge concentration tank 9 is connected to the graphene filter element 3 and the ceramic membrane separation device 4 respectively, and is used to collect backwash water from the graphene filter element 3 and the ceramic membrane separation device 4, as well as scum generated by the flotation device 2.

[0055] The sludge concentration tank 9 can increase the concentration of the sludge-containing wastewater and improve the treatment effect of the subsequent filtration treatment.

[0056] In some optional embodiments, a filter press 10 is further included;

[0057] The filter press 10 is connected to the sludge thickening tank 9 and is used to perform filter press treatment on the sludge in the sludge thickening tank 9 .

[0058] The sludge obtained by filter press treatment can be outsourced for processing.

[0059] In some optional embodiments, the water outlet of the filter press 10 is connected to the water inlet of the regulating tank 1.

[0060] The water produced by the filter press is re-treated to achieve zero discharge of wastewater.

[0061] In some optional embodiments, a nanofiltration water pool 11 is further provided between the water inlet of the first-stage nanofiltration device 5 and the water production port of the ceramic membrane separation device 4, the concentrate outlet of the reverse osmosis device 7, and the water production port of the second-stage nanofiltration device 6; the nanofiltration water pool 11 is used to collect wastewater from the water production port of the ceramic membrane separation device 4, the concentrate outlet of the reverse osmosis device 7, and the water production port of the second-stage nanofiltration device 6, and provide the collected wastewater to the first-stage nanofiltration device 5.

[0062] The produced water from the ceramic membrane separation device, the concentrated water from the reverse osmosis device and the produced water from the second-stage nanofiltration device are first collected in the nanofiltration pool and then supplied to the first-stage nanofiltration device, which is beneficial to improving the stability of the water inlet to the first-stage nanofiltration device.

[0063] In some optional embodiments, a water production pool 12 is further included;

[0064] The water inlet of the water production pool 12 is communicated with the water production port of the reverse osmosis device 7 and the water production port of the MVR evaporation device 8 respectively.

[0065] The produced water obtained from the reverse osmosis device and the MVR evaporation device is collected in the produced water pool for reuse.

[0066] In some optional embodiments, the filter pore size of the graphene filter element 3 is 1-5 μm.

[0067] In some optional embodiments, the membrane pore size of the ceramic membrane separation device 4 is 0.1-0.2 μm.

[0068] The present invention is further described below through specific examples. However, it should be understood that these examples are only used for more detailed description and should not be understood as limiting the present invention in any form.

[0069] Example 1

[0070] A device for treating oily wastewater from electronic cleaning, such as Figure 1 As shown, it includes a regulating tank 1, an air flotation device 2, a graphene filter element 3, a ceramic membrane separation device 4, a first-stage nanofiltration device 5, a second-stage nanofiltration device 6, a reverse osmosis device 7 and an MVR evaporation device 8;

[0071] Along the water treatment direction, the regulating tank 1, the air flotation device 2, the graphene filter element 3, the ceramic membrane separation device 4, the first-stage nanofiltration device 5 and the reverse osmosis device 7 are connected in sequence;

[0072] The regulating tank 1 is used to homogenize the wastewater;

[0073] The water inlet of the flotation device 2 is connected to the drain outlet of the regulating tank 1, and is used to flotate the wastewater from the regulating tank 1 to preliminarily remove oil and suspended matter from the wastewater;

[0074] The water inlet of the graphene filter element 3 is connected to the water outlet of the flotation device 2 to further remove oil and particulate matter in the wastewater;

[0075] The water inlet of the ceramic membrane separation device 4 is connected to the water outlet of the graphene filter element 3, which is used to deeply remove oil and particulate matter in the wastewater;

[0076] The water inlet of the first-stage nanofiltration device 5 is connected to the water outlet of the ceramic membrane separation device 4, the water outlet is connected to the water inlet of the reverse osmosis device 7, and the concentrated water outlet is connected to the water inlet of the second-stage nanofiltration device 6;

[0077] The concentrated water outlet of the reverse osmosis device 7 is connected to the water inlet of the first-stage nanofiltration device 5;

[0078] The water outlet of the second-stage nanofiltration device 6 is connected to the water inlet of the first-stage nanofiltration device 5 , and the concentrated water outlet is connected to the water inlet of the MVR evaporation device 8 .

[0079] Example 2

[0080] A device for treating oily wastewater from electronic cleaning, such as Figure 2 As shown, it includes a regulating tank 1, an air flotation device 2, a graphene filter element 3, a ceramic membrane separation device 4, a first-stage nanofiltration device 5, a second-stage nanofiltration device 6, a reverse osmosis device 7, an MVR evaporation device 8, a sludge concentration tank 9, a filter press 10, a nanofiltration water tank 11 and a water production tank 12;

[0081] Along the water treatment direction, the regulating tank 1, the air flotation device 2, the graphene filter element 3, the ceramic membrane separation device 4, the nanofiltration pool 11, the first-stage nanofiltration device 5 and the reverse osmosis device 7 are connected in sequence;

[0082] The regulating tank 1 is provided with an agitator and a coarse screen; the agitator is used to homogenize the wastewater; the coarse screen is used to intercept large suspended particles in the wastewater;

[0083] The water inlet of the flotation device 2 is connected to the drain outlet of the regulating tank 1, and is used to flotate the wastewater from the regulating tank 1 to preliminarily remove oil and suspended matter from the wastewater;

[0084] The water inlet of the graphene filter element 3 is connected to the water outlet of the flotation device 2 to further remove oil and particulate matter in the wastewater; the filter pore size of the graphene filter element 3 is 1-5 μm;

[0085] The water inlet of the ceramic membrane separation device 4 is connected to the water outlet of the graphene filter element 3, which is used to deeply remove oil and particulate matter in the wastewater; the membrane pore size of the ceramic membrane separation device 4 is 0.1-0.2μm;

[0086] The water inlet of the nanofiltration pool 11 is connected to the water outlet of the ceramic membrane separation device 4, and the drain outlet is connected to the water inlet of the first-stage nanofiltration device 5, so as to supply the collected wastewater to the water inlet of the first-stage nanofiltration device 5;

[0087] The water outlet of the first-stage nanofiltration device 5 is connected to the water inlet of the reverse osmosis device 7, and the concentrated water outlet is connected to the water inlet of the second-stage nanofiltration device 6;

[0088] The concentrated water outlet of the reverse osmosis device 7 is connected to the water inlet of the nanofiltration pool 11;

[0089] The water outlet of the second-stage nanofiltration device 6 is connected to the water inlet of the nanofiltration pool 11, and the concentrated water outlet is connected to the water inlet of the MVR evaporation device 8;

[0090] The sludge concentration tank 9 is connected to the graphene filter element 3 and the ceramic membrane separation device 4 respectively, and is used to collect the backwash water of the graphene filter element 3 and the ceramic membrane separation device 4, as well as the flotation generated by the flotation device 2;

[0091] The filter press 10 is connected to the sludge thickening tank 9 and is used to perform filter press treatment on the sludge in the sludge thickening tank 9; the water outlet of the filter press 10 is connected to the water inlet of the regulating tank 1;

[0092] The water inlet of the water production pool 12 is communicated with the water production port of the reverse osmosis device 7 and the water production port of the MVR evaporation device 8 respectively.

[0093] The working process is as follows:

[0094] The oily wastewater from electronic cleaning is filtered through a coarse screen and flows into the regulating tank for homogenization treatment. It then passes through the flotation device 2, the graphene filter element 3 and the ceramic membrane separation device 4 in sequence to remove most of the suspended matter and oil. It then passes through the first-stage nanofiltration device 5 and the reverse osmosis device 7 for purification treatment to obtain the first produced water. The wastewater discharged from the concentrated water outlet of the first-stage nanofiltration device 5 passes through the second-stage nanofiltration device 6 and the MVR evaporation device 8 in sequence for concentration to obtain salt and second produced water. The obtained first produced water and second produced water are collected in the water production pool 12.

[0095] The scum obtained by the flotation device 2 and the backwash water of the graphene filter element 3 and the ceramic membrane separation device 4 are collected in the sludge concentration tank 9, and then the solid-liquid separation is carried out by the filter press. The obtained sludge can be outsourced for treatment, and the obtained liquid is returned to the regulating tank 1.

[0096] Comparative Example 1

[0097] The difference from Example 2 is that the graphene filter element 3 is not included.

[0098] Comparative Example 2

[0099] The difference from Example 2 is that the graphene filter element 3 is replaced by a filter membrane with the same pore size.

[0100] The same batch of electronic cleaning oily wastewater was treated using the devices of Example 2 and Comparative Examples 1-2, respectively. The water quality of the effluent from the ceramic membrane separation device 4 was tested, and the results were as follows:

[0101] In Example 2, the effluent from the ceramic membrane separation device 4 removed 99.76% of the oil compared to the raw water; in Comparative Example 1, the effluent from the ceramic membrane separation device 4 had a higher residual rate than that of Example 2 and a poor oil removal effect; the filter membrane of Comparative Example 2 was easily fouled and clogged, had a short service life, and had a higher cost than Example 2.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for treating oily wastewater from electronic cleaning, characterized in that: It comprises a regulating tank (1), an air flotation device (2), a graphene filter element (3), a ceramic membrane separation device (4), a first-stage nanofiltration device (5), a second-stage nanofiltration device (6), a reverse osmosis device (7) and an MVR evaporation device (8); Along the water treatment direction, the regulating tank (1), the air flotation device (2), the graphene filter element (3), the ceramic membrane separation device (4), the first-stage nanofiltration device (5) and the reverse osmosis device (7) are connected in sequence; The water inlet of the flotation device (2) is connected to the outlet of the regulating tank (1), and is used to perform flotation treatment on the wastewater from the regulating tank (1) to preliminarily remove oil and suspended matter in the wastewater; The water inlet of the graphene filter element (3) is connected to the water outlet of the air flotation device (2) to further remove oil and particulate matter in the wastewater; The water inlet of the ceramic membrane separation device (4) is connected to the water outlet of the graphene filter element (3) for deep removal of oil and particulate matter in the wastewater; The water inlet of the first-stage nanofiltration device (5) is connected to the water outlet of the ceramic membrane separation device (4), the water outlet is connected to the water inlet of the reverse osmosis device (7), and the concentrated water outlet is connected to the water inlet of the second-stage nanofiltration device (6); The concentrated water outlet of the reverse osmosis device (7) is connected to the water inlet of the first-stage nanofiltration device (5); The water outlet of the second-stage nanofiltration device (6) is connected to the water inlet of the first-stage nanofiltration device (5), and the concentrated water outlet is connected to the water inlet of the MVR evaporation device (8).

2. The processing device according to claim 1, characterized in that The regulating tank (1) is provided with an agitator; The agitator is used for homogenizing the wastewater.

3. The processing device according to claim 1, characterized in that The regulating tank (1) is further provided with a coarse grid; The coarse screen is used to intercept large suspended particles in the wastewater.

4. The processing device according to claim 1, characterized in that Also included is a sludge thickening tank (9); The sludge concentration tank (9) is respectively connected to the graphene filter element (3) and the ceramic membrane separation device (4), and is used to collect backwash water from the graphene filter element (3) and the ceramic membrane separation device (4), as well as scum generated by the flotation device (2).

5. The processing device according to claim 4, characterized in that Also included is a filter press (10); The filter press (10) is connected to the sludge concentration tank (9) and is used for performing filter press treatment on the sludge in the sludge concentration tank (9).

6. The processing device according to claim 5, characterized in that The water outlet of the filter press (10) is communicated with the water inlet of the regulating tank (1).

7. The processing device according to claim 1, characterized in that A nanofiltration pool (11) is further provided between the water inlet of the first-stage nanofiltration device (5) and the water outlet of the ceramic membrane separation device (4), the concentrate outlet of the reverse osmosis device (7), and the water outlet of the second-stage nanofiltration device (6); the nanofiltration pool (11) is used to collect wastewater from the water outlet of the ceramic membrane separation device (4), the concentrate outlet of the reverse osmosis device (7), and the water outlet of the second-stage nanofiltration device (6), and to provide the collected wastewater to the first-stage nanofiltration device (5).

8. The processing device according to claim 1, characterized in that Also included is a water production pool (12); The water inlet of the water production pool (12) is communicated with the water production port of the reverse osmosis device (7) and the water production port of the MVR evaporation device (8) respectively.

9. The processing device according to claim 1, characterized in that The graphene filter element (3) has a filter element pore diameter of 1-5 μm.

10. The processing device according to claim 1, characterized in that The membrane pore size of the ceramic membrane separation device (4) is 0.1-0.2 μm.

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