A device and method for treating wastewater from machining.

Abstract

This invention relates to a machine tool wastewater treatment device and method, belonging to the field of wastewater treatment technology. The machine tool wastewater treatment device includes: a filter tank body; a first partition, horizontally disposed within a receiving cavity near the upper end of the filter tank body, with multiple first channels for oil phase entry and exit at one end; a second partition, disposed within the receiving cavity near the lower end of the filter tank body, with multiple second channels for water phase entry and exit at one end; and a primary filter plate, axially abutting between the first and second partitions along the filter tank body. This application improves the efficiency and quality of machine tool wastewater treatment by first effectively dispersing the oil phase, water phase, and particulate impurities in the machine tool wastewater, and then further separating the water and oil phases in the emulsified oil through oil-water separation filtration.

Description

Technical Field

[0001] This invention relates to a mechanical processing wastewater treatment device and method, belonging to the field of wastewater treatment technology. Background Technology

[0002] During machining processes, wastewater such as emulsions and cleaning solutions are discharged, and these wastewaters have a high concentration of organic matter. Among them, waste emulsion is a type of high-concentration oily wastewater with a complex composition. It has high concentrations of COD, oil, and SS, and the oil and emulsion are highly stable, with a pungent and irritating odor, making it difficult to treat. Direct discharge without treatment will cause serious environmental pollution.

[0003] Mechanical processing wastewater has a high oil content, containing various types of floating oil, emulsified oil, and dissolved oil. For floating oil, an oil separator is commonly used to separate the floating oil from the wastewater and store it in an oil storage tank. For emulsified oil, a special demulsifier is added. The demulsifier's chemical action disrupts the stable double-layer structure and emulsion system. Then, the wastewater passes through a two-stage dissolved air flotation device to achieve oil-water separation.

[0004] Regarding the aforementioned related technologies, the inventors have found that existing mechanical processing wastewater treatment is time-consuming and labor-intensive, and due to the presence of materials such as emulsified oil, the oil-water separation effect is poor. Furthermore, the large amount of particulate impurities in this type of wastewater further leads to poor treatment effect and low efficiency in mechanical processing wastewater treatment. Summary of the Invention

[0005] In order to improve the problems of poor treatment effect and low efficiency of existing machining wastewater treatment, this application provides a machining wastewater treatment device and treatment method.

[0006] In a first aspect, this application provides a machining wastewater treatment device, comprising:

[0007] The filter tank body has a receiving cavity that extends through it along its axial direction;

[0008] The first partition has the same cross-sectional shape as the filter tank body and is horizontally arranged in the accommodating cavity near the upper end of the filter tank body. One end of the first partition is provided with a plurality of first channels for the oil phase to enter and exit.

[0009] The second partition has the same shape as the first partition and is horizontally arranged in the receiving cavity near the lower end of the filter tank body. One end of the second partition is provided with multiple second channels for water phase to enter and exit.

[0010] A primary filter plate is disposed axially between the first partition and the second partition along the filter tank body. Both ends of the primary filter plate are disposed in contact with the inner wall of the filter tank body to separate the two layers of the primary filter plate to form a treatment area and an outlet area. An outlet channel is provided on the outer wall of the filter tank body on the outlet area side, which extends through the thickness direction.

[0011] The first and second channels are located on one side of the processing area so that the upper and lower receiving cavities of the filter tank body are connected to the processing area.

[0012] Through the above technical solution, this application treats wastewater using a machining wastewater treatment device. On the one hand, the machining wastewater treatment device enables efficient operation, improving upon the traditional method where each treatment step is carried out separately, thus increasing the efficiency of machining wastewater treatment. On the other hand, by setting up a first and second baffle, this application effectively disperses the oil phase, water phase, and particulate impurities in the machining wastewater, improving the efficiency and quality of subsequent treatment. Then, through an oil-water separation filtration method, the water phase and oil phase in the emulsified oil are further separated, thereby further improving the efficiency and quality of machining wastewater treatment.

[0013] Furthermore, the water outlet area also includes:

[0014] Two secondary filter plates are provided, with one end of each plate abutting against the inner wall of the water outlet area, and the other end abutting against the inner wall of the water outlet area. The two secondary filter plates are inclined and arranged opposite each other to divide the water outlet area into three sections, and a secondary filtration area is formed between the two secondary filter plates. The water outlet channel is located on the inner wall of the secondary filtration area.

[0015] Through the above technical solution, this application further optimizes the structure of the effluent zone and further improves the treatment effect of machining wastewater through secondary filtration by the secondary filter plate.

[0016] Furthermore, the primary filter plate is filled with primary filter media, which is mullite whiskers / cellulose microspheres.

[0017] Furthermore, the primary filter plate is filled with primary filter media, which is mullite whiskers / cellulose microspheres.

[0018] Furthermore, the mullite whisker / cellulose microsphere particles are prepared using the following method:

[0019] Take boehmite, aluminum fluoride and silica powder, stir and mix them, place them in a ball mill, ball mill and mix them, and collect the mixed powder;

[0020] After drying the mixed powder, it was kept at 1300-1350℃ and allowed to cool to room temperature before collecting the mullite whiskers.

[0021] After the mullite whiskers are crushed and dispersed, they are mixed with carboxymethyl cellulose nanofibers and then ultrasonically dispersed.

[0022] After taking the dispersion and adding polyethyleneimine and stirring, the mixture was freeze-dried and then dried to collect mullite whisker / cellulose microspheres.

[0023] Through the above technical solution, this application selects mullite whisker-doped cellulose aerogel microspheres as the main filter material for primary filtration of machining wastewater. Since mullite whiskers and cellulose aerogel can effectively separate oil-water mixtures, the treatment effect of machining wastewater is improved. Simultaneously, this application uses carboxymethyl cellulose nanofibers as the main material. This material contains a large number of carboxyl, methyl, and hydroxyl groups, improving the hydrophilicity and oleophobicity of traditional single filter materials. The addition of carboxymethyl cellulose nanofibers to the mullite whisker / cellulose microsphere particles makes it easier for water molecules to adsorb onto the surface of the filter material, reducing the resistance of water passing through the filter material. At the same time, the adsorbed water molecules can also prevent the oil phase from contacting the filter material, improving the anti-fouling performance of the filter material.

[0024] Furthermore, the filter material used in the secondary filter plate is mullite-sepiolite ceramic particles.

[0025] Furthermore, the mullite-sepiolite ceramic particles are manufactured using the following method:

[0026] Mullite whiskers and sepiolite fibers were mixed and ball-milled, and the ball-milled particles were collected.

[0027] After mixing ball milling particles with sodium carboxymethyl cellulose solution, nickel nitrate solution and polyethylene powder, the slurry is dispersed and collected and placed in a grinding mold. After freezing and molding, the mixture is heated and kept warm to prepare the mullite-sepiolite ceramic particles.

[0028] Through the above technical solution, this application selects mullite and sepiolite composite to prepare filter material. Since the ceramic particles formed after the composite of sepiolite and mullite whiskers have high internal porosity, they can improve their ability to adsorb oil phase. Thus, the filter material can effectively store and adsorb oil phase, thereby improving the removal effect of oil phase in machining wastewater.

[0029] Furthermore, the amount of filter material filled in the secondary filter plate is 0.12-0.15 g / cm3.

[0030] Secondly, this application provides a method for treating wastewater using a machining wastewater treatment device, employing the following technical solution:

[0031] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0032] Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition.

[0033] Primary filtration: During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate;

[0034] Secondary filtration: The material after primary filtration is filtered by two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0035] Through the above technical solution, this application first removes large particles of impurities and oil phase from the machining wastewater through static pretreatment, then removes part of the oil phase through a first-stage filtration process that is both hydrophilic and oleophobic, and finally adsorbs small particles of oil phase through the filter material in the secondary filter plate. This improves the overall treatment effect of the machining wastewater. At the same time, the solution is easy to operate and can effectively improve the treatment efficiency.

[0036] In summary, this application has the following beneficial effects:

[0037] First, this application treats wastewater using a machining wastewater treatment device. On the one hand, the treatment using this device enables efficient operation, improving upon the traditional method where each treatment step is performed separately, thus increasing the efficiency of machining wastewater treatment. On the other hand, by setting up a first and second baffle, this application effectively disperses the oil phase, water phase, and particulate impurities in the machining wastewater, improving the efficiency and quality of subsequent treatment. Then, through an oil-water separation filtration method, the water phase and oil phase in the emulsified oil are further separated, thereby further improving the efficiency and quality of machining wastewater treatment.

[0038] Secondly, this application uses mullite whisker-doped cellulose aerogel microspheres as the main filter material for primary filtration of machining wastewater. Since mullite whiskers and cellulose aerogel can effectively separate oil-water mixtures, the treatment effect of machining wastewater is improved. Simultaneously, this application uses carboxymethyl cellulose nanofibers as the main material. This material contains a large number of carboxyl, methyl, and hydroxyl groups, improving the hydrophilicity and oleophobicity of traditional single filter materials. The addition of carboxymethyl cellulose nanofibers to the mullite whisker / cellulose microsphere particles makes it easier for water molecules to adsorb onto the surface of the filter material, reducing the resistance of water passing through the filter material. At the same time, the adsorbed water molecules can also prevent the oil phase from contacting the filter material, improving the anti-fouling performance of the filter material.

[0039] Third, this application uses mullite whisker-doped cellulose aerogel microspheres as the main filter material for primary filtration of machining wastewater. Since mullite whiskers and cellulose aerogel can effectively separate oil-water mixtures, the treatment effect of machining wastewater is improved. Simultaneously, this application uses carboxymethyl cellulose nanofibers as the main material. This material contains a large number of carboxyl, methyl, and hydroxyl groups, improving the hydrophilicity and oleophobicity of traditional single filter materials. The addition of carboxymethyl cellulose nanofibers to the mullite whisker / cellulose microsphere particles makes it easier for water molecules to adsorb onto the surface of the filter material, reducing the resistance of water passing through the filter material. At the same time, the adsorbed water molecules can also prevent the oil phase from contacting the filter material, improving the anti-fouling performance of the filter material.

[0040] Fourth, this application first removes large particles of impurities and oil phase from the machining wastewater through static pretreatment, then removes some of the oil phase through a first-stage filtration process that is both hydrophilic and oleophobic, and finally adsorbs small particles of oil phase through the filter material in the secondary filter plate. This improves the overall treatment effect of the machining wastewater. At the same time, the overall operation of this scheme is simple and can effectively improve the treatment efficiency. Attached Figure Description

[0041] Figure 1 This is a front cross-sectional view of the machining wastewater treatment device used in Embodiment 1 of this application;

[0042] Figure 2 This is a schematic diagram of the structure of the primary filter plate in the mechanical processing wastewater treatment device used in Embodiment 1 of this application.

[0043] Among them, 1. Filter tank body; 2. First baffle; 21. First channel; 3. Second baffle; 31. Second channel; 4. Primary filter plate; 5. Water outlet area; 51. Water outlet channel; 6. Secondary filter plate; 61. Secondary filtration area; 7. Oil phase outlet; 8. Water inlet. Detailed Implementation

[0044] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0045] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0046] There are no particular restrictions on the purity of any raw materials used in this invention. However, this invention preferably uses analytical grade or conventional purity requirements in the preparation field.

[0047] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0048] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0049] This application discloses a machine processing wastewater treatment device, which consists of... Figure 1 As shown, the filter tank body 1 is formed into a columnar filter vessel. Inside the filter tank body 1, there is a receiving cavity that extends along its axial direction. At the lower end of the filter tank body 1, there is a water inlet 8 that extends along its wall thickness to allow machining wastewater to enter the receiving cavity. At the upper end of the filter tank body 1, there is an oil phase outlet 7 that extends along its wall thickness.

[0050] At the upper and lower ends of the internal cavity of the filter tank body 1, a first partition 2 and a second partition 3 are respectively provided, which are circumferentially abutting against the inner wall surface of the filter tank body 1. The first partition 2 and the second partition 3 have the same structure. The cross-sectional shape of the inner circumferential surface of the first partition 2 is consistent with that of the filter tank body 1 and is formed into a disc structure. On one side of the semicircle of the first partition 2, there are multiple first channels 21 that penetrate along its thickness direction. On one side of the semicircle of the second partition 3, there are multiple second channels 31 that penetrate along its thickness direction. During installation, the first channels 21 and the second channels 31 provided on the first partition 2 and the second partition 3 are arranged in the same direction.

[0051] Between the first partition 2 and the second partition 3, a primary filter plate 4 is provided. The primary filter plate 4 contains filter material. The upper and lower ends of the primary filter plate 4 abut against the first partition 2 and the second partition 3, respectively. The left and right ends of the primary filter plate 4 abut against the inner wall of the filter tank body 1, respectively. On the side of the primary filter plate 4 away from the first channel 21 provided on the first partition 2, a water outlet area 5 is formed. In the water outlet area 5, two secondary filter plates 6 are provided, with one end abutting against the other end abutting against the inner wall of the filter tank body 1. The area formed by the two secondary filter plates 6 being inclined to each other is called the secondary filtration area 61. On the inner wall of the secondary filtration area 61, a water outlet channel 51 is provided that runs through its thickness direction.

[0052] Preparation Example 1

[0053] Mullite whiskers / cellulose microspheres 1

[0054] Take 800g of boehmite, 70g of aluminum fluoride and 200g of silica powder, stir and mix them and place them in a ball mill. Use anhydrous ethanol as the ball milling medium to ball mill and mix them and collect the mixed powder.

[0055] After drying the mixed powder at 60℃, it was then kept at 1300℃ for 6 hours, allowed to cool to room temperature, and the mullite whiskers were collected.

[0056] Take 500g of mullite whiskers, crush and disperse them, then mix them with 1200g of 2.5% carboxymethyl cellulose nanofiber solution and ultrasonically disperse them.

[0057] The dispersion was taken and 1200g of polyethyleneimine was added and stirred. The mixture was then freeze-dried and dried at 110℃ to obtain mullite whisker / cellulose microsphere particles 1.

[0058] Preparation Example 2

[0059] Mullite whiskers / cellulose microspheres 2

[0060] Take 850g of boehmite, 850g of aluminum fluoride and 250g of silica powder, stir and mix them and place them in a ball mill. Use anhydrous ethanol as the ball milling medium to ball mill and mix them and collect the mixed powder.

[0061] After drying the mixed powder at 70℃, it was then kept at 1325℃ for 6 hours, allowed to cool to room temperature, and the mullite whiskers were collected.

[0062] Take 650g of mullite whiskers, crush and disperse them, then mix them with 1350g of 2.5% carboxymethyl cellulose nanofiber solution and ultrasonically disperse them.

[0063] The dispersion was taken and 1350g of polyethyleneimine was added and stirred. The mixture was then freeze-dried and dried at 110℃ to obtain mullite whisker / cellulose microsphere particles 2.

[0064] Preparation Example 3

[0065] Mullite whiskers / cellulose microspheres 3

[0066] Take 900g of boehmite, 100g of aluminum fluoride and 300g of silica powder, stir and mix them and place them in a ball mill. Use anhydrous ethanol as the ball milling medium to ball mill and mix them and collect the mixed powder.

[0067] After drying the mixed powder at 80℃, it was then kept at 1350℃ for 6 hours, allowed to cool to room temperature, and the mullite whiskers were collected.

[0068] Take 800g of mullite whiskers, crush and disperse them, then mix them with 1500g of 2.5% carboxymethyl cellulose nanofiber solution and ultrasonically disperse them.

[0069] The dispersion was taken and 1500g of polyethyleneimine was added and stirred. The mixture was then freeze-dried and dried at 110℃ to obtain mullite whisker / cellulose microspheres 3.

[0070] Preparation Example 4

[0071] Mullite-sepiolite ceramic particles 1

[0072] Take 100g of mullite whiskers and 100g of sepiolite fibers with a diameter of 5-10μm and a length of 100-200μm, mix and ball mill them, and collect the ball-milled particles;

[0073] 150g of ball-milled particles were mixed with 1.5% sodium carboxymethyl cellulose solution, 0.1mol / L nickel nitrate solution and 80g of polyethylene powder. The slurry was dispersed and collected and placed in a mold. After vacuum freezing, the mixture was heated to 650-750℃ and kept warm to prepare the mullite-sepiolite ceramic particles 1.

[0074] Preparation Example 5

[0075] Mullite-sepiolite ceramic particles 2

[0076] Take 150g of mullite whiskers and 150g of sepiolite fibers with a diameter of 5-10μm and a length of 100-200μm, mix and ball mill them, and collect the ball-milled particles;

[0077] 175g of ball-milled particles were mixed with 1.5% sodium carboxymethyl cellulose solution, 0.1mol / L nickel nitrate solution and 90g of polyethylene powder. The mixture was dispersed and collected into a mold. After vacuum freezing, the mixture was heated to 700℃ and kept warm to prepare the mullite-sepiolite ceramic particles 2.

[0078] Preparation Example 6

[0079] Mullite-sepiolite ceramic particles 3

[0080] Take 200g of mullite whiskers and 200g of sepiolite fibers with a diameter of 5-10μm and a length of 100-200μm, mix and ball mill them, and collect the ball-milled particles;

[0081] 200g of ball-milled particles were mixed with 1.5% sodium carboxymethyl cellulose solution, 0.1mol / L nickel nitrate solution and 100g of polyethylene powder. The slurry was dispersed and collected and placed in a mold. After vacuum freezing and molding, the temperature was raised to 750℃ and kept warm to prepare the mullite-sepiolite ceramic particles 3.

[0082] Example 1

[0083] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0084] Pre-treatment by settling: The mechanical wastewater to be treated (petroleum content 880mg / L) enters the filter tank body from the bottom end of the filter tank body. It enters the receiving cavity through the second baffle. After settling, the upper oil phase passes through the first baffle and accumulates at the top of the receiving cavity. The lower large particles effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second baffle.

[0085] Single filtration: based on a filter media packing density of 0.12 g / cm³. 3 Mullite whisker / cellulose microsphere particles 1 are filled into a primary filter plate. During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate.

[0086] Secondary filtration: The filter material filling rate is 0.12 g / cm³. 3 Mullite-sepiolite ceramic particles 1 are filled into the secondary filter plate. The material after primary filtration is filtered by the two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0087] Example 2

[0088] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0089] Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition.

[0090] Single filtration: based on a filter media packing density of 0.13 g / cm³. 3 Mullite whisker / cellulose microsphere particles 1 are filled into a primary filter plate. During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate.

[0091] Secondary filtration: The filter material filling rate is 0.13 g / cm³. 3 Mullite-sepiolite ceramic particles 1 are filled into the secondary filter plate. The material after primary filtration is filtered by the two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0092] Example 3

[0093] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0094] Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition.

[0095] Single filtration: based on a filter media packing density of 0.15 g / cm³. 3 Mullite whisker / cellulose microsphere particles 1 are filled into a primary filter plate. During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate.

[0096] Secondary filtration: The filter material filling rate is 0.15 g / cm³. 3 Mullite-sepiolite ceramic particles 1 are filled into the secondary filter plate. The material after primary filtration is filtered by the two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0097] Example 4

[0098] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0099] Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition.

[0100] Single filtration: based on a filter media packing density of 0.13 g / cm³. 3 Mullite whisker / cellulose microsphere particles 2 are filled into a primary filter plate. During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate.

[0101] Secondary filtration: The filler material should be 0.12-0.15 g / cm³. 3 Mullite-sepiolite ceramic particles 2 are filled into the secondary filter plate. The material after primary filtration is filtered by the two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0102] Example 5

[0103] A method for treating wastewater using a machining wastewater treatment device includes the following steps:

[0104] Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition.

[0105] Single filtration: based on a filter media packing density of 0.13 g / cm³. 3 Mullite whisker / cellulose microsphere particles 3 are filled into a primary filter plate. During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate.

[0106] Secondary filtration: The filter material filling rate is 0.13 g / cm³. 3 Mullite-sepiolite ceramic particles 3 are filled into the secondary filter plate. The material after primary filtration is filtered by the two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

[0107] Performance testing

[0108] The wastewater treated in Examples 1-5 was subjected to performance testing according to the method specified in HJ 637—2018 "Determination of Petroleum and Animal Oils in Water Quality - Ultraviolet Spectrophotometry".

[0109] The specific test data are shown in Table 1.

[0110] Table 1 Performance Test Table

[0111] sample Petroleum content / mg / L Example 1 39.8 Example 2 37.5 Example 3 38.4 Example 4 36.7 Example 5 37.1

[0112] Analysis and explanation are based on the data from Examples 1-5.

[0113] As can be seen from Table 1 and Examples 1-5, this application first removes large particles of impurities and oil phase from the machining wastewater through static pretreatment, then removes some of the oil phase through a first-stage filtration process that is both hydrophilic and oleophobic, and finally adsorbs small particles of oil phase through the filter material in the secondary filter plate. This improves the overall treatment effect of the machining wastewater. At the same time, the scheme is simple to operate and can effectively improve the treatment efficiency.

[0114] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A device for treating wastewater from machining, characterized in that, include: The filter tank body (1) is provided with a receiving cavity that extends through it along its axial direction; The first partition (2) has the same cross-sectional shape as the filter tank body (1) and is horizontally arranged in the cavity near the upper end of the filter tank body (1). One end of the first partition (2) is provided with a plurality of first channels (21) for oil phase to enter and exit. The second partition (3) has the same shape as the first partition (2) and is horizontally arranged in the cavity near the lower end of the filter tank body (1). The second partition (3) has multiple second channels (31) for water phase to enter and exit. A primary filter plate (4) is disposed between the first partition plate (2) and the second partition plate (3) along the axial direction of the filter tank body (1). The two ends of the primary filter plate (4) are disposed in contact with the inner wall of the filter tank body (1) so that the two layers of the primary filter plate (4) are separated to form a treatment area and an outlet area (5). An outlet channel (51) is provided on the outer wall of the filter tank body (1) on one side of the outlet area (5) along its thickness direction. The first channel (21) and the second channel (31) are located on one side of the processing area so that the upper end receiving cavity of the filter tank body (1) and the lower end receiving cavity of the filter tank body (1) are connected to the processing area. The primary filter plate is filled with primary filter media, which is mullite whiskers / cellulose microspheres. The mullite whisker / cellulose microspheres were prepared using the following method: Take boehmite, aluminum fluoride and silica powder, stir and mix them, place them in a ball mill, ball mill and mix them, and collect the mixed powder; After drying the mixed powder, it was kept at 1300-1350℃ and allowed to cool to room temperature before collecting the mullite whiskers. After the mullite whiskers are crushed and dispersed, they are mixed with carboxymethyl cellulose nanofibers and then ultrasonically dispersed. After taking the dispersion and adding polyethyleneimine and stirring, the mixture was freeze-dried and then dried to collect mullite whisker / cellulose microspheres.

2. The mechanical processing wastewater treatment device according to claim 1, characterized in that, The water outlet area (5) also includes: Two secondary filter plates (6) are provided, with one end of each plate abutting against the other end and the other end abutting against the inner wall of the water outlet area (5). The two secondary filter plates (6) are inclined and arranged opposite each other to divide the water outlet area (5) into three sections. A secondary filter area (61) is formed between the two secondary filter plates (6). The water outlet channel (51) is located on the inner wall of the secondary filter area (61).

3. The mechanical processing wastewater treatment device according to claim 2, characterized in that, The filter material used in the secondary filter plate is mullite-sepiolite ceramic particles.

4. The mechanical processing wastewater treatment device according to claim 1, characterized in that, The mullite-sepiolite ceramic particles are manufactured using the following method: Mullite whiskers and sepiolite fibers were mixed and ball-milled, and the ball-milled particles were collected. After mixing ball milling particles with sodium carboxymethyl cellulose solution, nickel nitrate solution and polyethylene powder, the slurry is dispersed and collected and placed in a grinding mold. After freezing and molding, the mixture is heated and kept warm to prepare the mullite-sepiolite ceramic particles.

5. The mechanical processing wastewater treatment device according to claim 2, characterized in that, The amount of filter material filling the secondary filter plate is 0.12-0.15 g / cm³. 3 .

6. A method for treating wastewater using the machining wastewater treatment device according to any one of claims 1-5, characterized in that, Includes the following steps: Pre-treatment by settling: The mechanical wastewater to be treated enters the filter tank body from the lower end of the filter tank body, and enters the receiving cavity through the second partition. After settling, the upper oil phase passes through the first partition and accumulates at the upper end of the receiving cavity. The lower large particle impurities effectively filter the lower particles, while the small particles that settle fall into the lower end of the receiving cavity through the second channel of the second partition. Primary filtration: During the static pretreatment process, the intermediate layer wastewater is filtered through the filter material in the primary filter plate; Secondary filtration: The material after primary filtration is filtered by two secondary filter plates and discharged through the outlet, thus realizing the treatment of mechanical processing wastewater.

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