A mulberry silk wastewater filtration system and method

Abstract

The application provides a silkworm silk wastewater filtering system and method, and aims to solve the problems of a large number of wastewater treatment processes and high cost in the prior art.The silkworm silk wastewater filtering system comprises a tank body, the tank body is connected with a ceramic membrane filter through a feed pipe, a water pump is arranged on the feed pipe, a permeation end of the ceramic membrane filter is connected with a reaction kettle, a retentate end of the ceramic membrane filter is connected with a concentrated liquid storage tank, a stirring shaft driven by a motor is arranged in the reaction kettle, a feeding opening is arranged at the top end of the reaction kettle, a filtering conveying mechanism is connected with a discharge port of the reaction kettle, and the filtering conveying mechanism is connected with a material box of a drying device.The process of the sericin wastewater treatment is efficient and simple, the production efficiency is improved, and the process is easy to operate and control.

Description

Technical Field

[0001] This invention relates to the field of silkworm silk processing, and in particular to a silkworm silk wastewater filtration system. Background Technology

[0002] Sericin is primarily obtained from silkworm cocoons, accounting for more than a quarter of the total silk resources. However, the silk processing industry generates large amounts of wastewater containing high concentrations of sericin. Direct discharge without treatment would severely pollute water sources and deteriorate the surrounding environment. Therefore, the effective treatment and recycling of sericin wastewater has significant environmental and economic value.

[0003] Currently, there are two main categories of methods for recovering sericin from silk processing wastewater: chemical methods and physical methods. Chemical methods include acid precipitation, organic solvent methods, chemical coagulation, and ion exchange recovery. Acid precipitation is a common method for extracting sericin. It involves adjusting the pH of alkaline degumming wastewater to between 3.5 and 4.5 to minimize the solubility of sericin protein, causing it to precipitate from the solution. This method is simple and low-cost, but the sericin protein recovery rate is low, only about 40%, and requires acid-resistant equipment. Physical methods include centrifugation, freezing, and ultrafiltration. Freezing requires freeze-drying equipment, which is energy-intensive and requires a long freezing time, thus increasing costs. Centrifugation is only effective if the sericin protein has been separated from the water; centrifugation is inefficient for degummed wastewater that has not undergone precipitation, resulting in low recovery rates and making it generally unsuitable for industrial production. Ultrafiltration, on the other hand, suffers from high maintenance and equipment costs due to the susceptibility of ultrafiltration membranes to fouling and clogging.

[0004] In view of the problems of multiple processes and high costs in the current treatment of sericin wastewater, there is an urgent need for a filtration system for mulberry silk wastewater. Summary of the Invention

[0005] This invention proposes a filtration system for mulberry silk wastewater, which solves the problems of multiple wastewater treatment processes and high costs in the existing technology.

[0006] The technical solution of this invention is implemented as follows:

[0007] A filtration system for mulberry silk wastewater includes a tank, a ceramic membrane filter connected to the tank via a feed pipe, a water pump installed on the feed pipe, a reaction vessel connected to the permeate end of the ceramic membrane filter, a concentrated liquid storage tank connected to the filtration end of the ceramic membrane filter, a stirring shaft driven by a motor installed inside the reaction vessel, a feed port installed at the top of the reaction vessel, a filter conveying mechanism connected to the discharge port of the reaction vessel, and the filter conveying mechanism connected to the material box of a drying device.

[0008] Furthermore, the filtering and conveying mechanism includes a box body, a filter groove is provided inside the box body, a plurality of filter holes are provided at the bottom of the filter groove, two fixed shafts are provided on both sides of the filter groove, rollers are rotatably connected to the fixed shafts, one of the rollers is connected to a drive motor, and sliding grooves are provided on both sides of the box body, the rollers move in the sliding grooves, the sliding grooves include a first horizontal section and a vertical section.

[0009] Furthermore, an inclined section is provided between the vertical section and the first horizontal section of the chute, and a second horizontal section is provided on the side wall of the box body. The second horizontal section is connected to the inclined section, and the bottom surface of the second horizontal section is connected to the bottom surface of the first horizontal section. A movable plate is slidably provided at the connection point. The bottom surface of the movable plate is connected to the side wall of the second horizontal section through several telescopic rods. The movable plate covers the bottom surface of the filter tank. An inclined plate is hinged at the connection point between the second horizontal section and the inclined section, and the hinge point is above the second horizontal section. The inclined plate coincides with the side wall of the inclined section.

[0010] Furthermore, the filter conveying mechanism is equipped with a distilled water pipe rack, which includes a frame, a water supply pipe at the top of the frame, and several water spray nozzles on the side wall of the water supply pipe, which correspond to the filter tank.

[0011] Furthermore, the ceramic membrane filter includes a housing, a ceramic membrane disposed inside the housing, and annular limiting plates threaded to the inner sidewalls at both ends of the housing. A handle is hinged to the limiting plate, and the bottom surface of the limiting plate is sealed to one end of the ceramic membrane through a sealing ring.

[0012] Furthermore, the bottom of the reactor is provided with a discharge pipe, the end of which is above the filter tank, and the discharge pipe is provided with a bend. The filter tank is provided with a filter paperboard inside.

[0013] Furthermore, the drying device is a spray dryer or a heated molding die.

[0014] A method for filtering silkworm silk wastewater specifically includes the following steps:

[0015] S1. Start the water pump to allow the wastewater in the tank to enter the ceramic membrane filter through the feed pipe;

[0016] S2. The ceramic membrane filter filters the wastewater, and the retained concentrate enters the concentrate storage tank. The filtrate that has permeated through the ceramic membrane filter enters the reaction vessel.

[0017] S3. Add flocculant to the reactor and stir the filtrate thoroughly with the stirring shaft. After stirring, let it stand to allow the sericin in the filtrate to form a gel-like precipitate.

[0018] S4. Open the valve at the outlet of the reactor to allow the mixture in the reactor to enter the filtration and conveying mechanism, which will then send the gel into the material box of the drying device.

[0019] S5. The drying device dries the gel to form powder or lumps.

[0020] Beneficial effects:

[0021] This invention utilizes a ceramic membrane filter to effectively remove suspended solids and particulate matter from wastewater, and concentrates silkworm wastewater, increasing the concentration of sericin. This increased sericin concentration allows for faster sericin gel formation in the reaction vessel. Furthermore, the ceramic membrane filter element is washable, extending its service life. A filtration conveying mechanism separates the processed sericin gel from the wastewater and moves the gel to the next process, reducing labor and lowering costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the ceramic membrane in this invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the limiting plate in this invention;

[0026] Figure 4 This is a cross-sectional view of the reaction vessel in this invention;

[0027] Figure 5 This is a three-dimensional structural diagram of the filter conveying mechanism in this invention;

[0028] Figure 6 This is a schematic diagram of the planar structure of the filtering and conveying mechanism in this invention;

[0029] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0030] Figure 8 A partial view of the roller passing over the inclined plate;

[0031] Figure 9 for Figure 5 A magnified view of a section at point B.

[0032] The components are as follows: 1. Tank body, 2. Water pump, 3. Ceramic membrane filter, 31. Shell, 32. Ceramic membrane, 33. Limiting plate, 34. Handle, 35. Shrinkage port, 4. Concentrate storage tank, 5. Reactor, 51. Feed port, 52. Stirring shaft, 53. Discharge pipe, 6. Filter conveying mechanism, 61. Box body, 62. Filter tank, 63. Roller, 64. Drive motor, 65. Second horizontal section, 66. Movable plate, 67. Inclined plate, 7. Drying device, 8. Distilled water pipe rack, 81. Water supply pipe, 82. Spray nozzle. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 6 As shown, this embodiment of the invention provides a mulberry silk wastewater filtration system, including a tank 1. The tank 1 is connected to a ceramic membrane filter 3 via a feed pipe. A water pump 2 is installed on the feed pipe. The permeation end of the ceramic membrane filter 3 is connected to a reaction vessel 5. The retention end of the ceramic membrane filter 3 is connected to a concentrated liquid storage tank 4. A stirring shaft 52 driven by a motor is installed inside the reaction vessel 5. A feeding port 51 is installed at the top of the reaction vessel 5. A filtration conveying mechanism 6 is connected to the discharge port of the reaction vessel 5. The filtration conveying mechanism 6 is connected to the material box of the drying device 7.

[0035] During operation: Pump 2 is started, allowing wastewater from tank 1 to enter the ceramic membrane filter 3 through the feed pipe. The ceramic membrane filter 3 filters the wastewater, and the concentrated liquid enters the concentrated liquid storage tank 4. The filtrate that has passed through the ceramic membrane filter 3 enters the reaction vessel 5. Flocculant is added to the reaction vessel 5; the preferred flocculant is chitosan flocculant or tannin flocculant. Chitosan is non-toxic, harmless, widely available, and environmentally friendly. The filtrate is thoroughly stirred by the stirring shaft 52, and then allowed to stand to allow the sericin in the filtrate to form a gel-like precipitate. The valve at the outlet of the reaction vessel 5 is opened, allowing the mixture in the reaction vessel 5 to enter the filtration conveying mechanism 6. The filtration conveying mechanism 6 sends the gel into the material box of the drying device 7. The drying device 7 dries the gel, causing it to form powder or lumps.

[0036] This invention uses a ceramic membrane filter 3 to filter wastewater, effectively removing suspended solids and particulate impurities, and concentrating silkworm wastewater to increase the concentration of sericin. This increased sericin concentration allows the reaction vessel 5 to form sericin gel more quickly. A stirring shaft 52 inside the reaction vessel 5 thoroughly stirs the wastewater, ensuring sufficient contact between the sericin and flocculant, thus improving reaction efficiency. The ceramic membrane filter 3 is connected to a concentrate storage tank 4 at its retention end, allowing for the storage of the filtered concentrate for subsequent processing and utilization, reducing environmental pollution. The filter conveying mechanism 6 enables automated control, further improving production efficiency.

[0037] The filtering and conveying mechanism 6 includes a housing 61, within which a filtering groove 62 is provided. The bottom of the filtering groove 62 has several filtering holes. Two fixed shafts are provided on each side of the filtering groove 62, and rollers 63 are rotatably connected to these shafts. One of the rollers 63 is connected to a drive motor 64 via a gear chain. Slides are provided on both sides of the housing 61, within which the rollers 63 move. Each slide includes a first horizontal section and a vertical section. A reversing switch is provided in the vertical section, and a limit switch is provided on the side wall of the first horizontal section. Both the reversing switch and the limit switch are electrically connected to the drive motor 64 via a controller. The front end of the filtering groove 62 is inclined, and the upper end of the filtering groove 62 is larger than the lower end. The inclined front end of the filtering groove 62 facilitates the smooth flow of gel into the material bin of the drying device.

[0038] When the valve at the bottom of reactor 5 is opened, the mixture of gel and filtrate enters the filter tank 62. The filter holes thoroughly filter the mixture, separating the filtrate containing flocculant from the gel, reducing flocculant contamination of the gel during drying. The filtered filtrate is collected through box 61 and recycled, reducing resource waste. After the mixture has completely passed through the filter tank 62, the drive motor 64 is started, driving the roller 63 to rotate. The roller 63 moves the filter tank 62 along the chute. When the roller 63 enters the vertical section, the filter tank 62 rotates and pours the gel into the material box of the drying device 7. After the roller 63 contacts the reversing switch at the bottom of the vertical section, the drive motor 64 drives the roller 63 to reverse, causing the roller 63 to move the filter tank 62 back into the first horizontal section. When the filter tank 62 contacts the limit switch set in the first horizontal section, the limit switch de-energizes the drive motor 64, and the filter tank 62 waits in the first horizontal section for the reactor 5 to discharge. The drive motor 64 is a reversible motor, such as a servo motor. The reversing switch controls the servo motor to reverse via a controller, and the limit switch de-energizes the servo motor via the controller. The drive motor 64 is connected to rollers 63 and moves within a groove, enabling automated control and improving production efficiency.

[0039] An inclined section is provided between the vertical section and the first horizontal section of the chute. A second horizontal section 65 is provided on the side wall of the box body 61. The second horizontal section 65 is connected to the inclined section and is continuous with the bottom surface of the first horizontal section. A movable plate 66 is slidably provided at the connection point. The bottom surface of the movable plate 66 is connected to the bottom surface of the second horizontal section 65 through several telescopic rods. The movable plate 66 covers the bottom surface of the filter tank 62. An inclined plate 67 is hinged at the connection point between the second horizontal section 65 and the inclined section, and the hinge is located above the second horizontal section 65. The inclined plate 67 coincides with the side wall of the inclined section. The telescopic rods are damping telescopic rods. The damping telescopic rods can effectively prevent the telescopic rods from lifting the rollers after the pressure decreases, thus improving the reliability and safety of the equipment. A start switch corresponding to the movable plate 66 is provided on the second horizontal section 65. The movable plate 66 covers the bottom surface of the filter tank 62 to prevent filtrate leakage.

[0040] When the valve at the bottom of the reactor 5 is opened, the mixture of gel and filtrate enters the filter tank 62. When the mixture has completely entered the filter tank 62, it presses down the movable plate 66 and the filter tank 62, causing the movable plate 66 to contact the start switch on the second horizontal section 65. The start switch, through the controller, causes the drive motor 62 to drive the roller 63 to rotate. The roller 63 drives the filter tank 62 to move. When the filter tank 62 moves out of the movable plate 66, the filter tank 62 separates the mixture, leaving the gel in the filter tank 62. The filter tank 62 continues to move, and the roller 63 pushes open the inclined plate 67. When the roller 63 has passed the inclined plate 67, the inclined plate 67 closes under the action of gravity. The filter tank 62 continues to move, pouring the gel into the material box of the drying device 7. After the roller 63 touches the reverse switch, the roller 63 reverses under the drive of the drive motor 62, and the filter tank 62 enters the first horizontal section along the inclined section and the inclined plate 67. The above solution enables automatic separation and unloading, is simple and convenient to operate, improves production efficiency, and reduces the time and cost of manual operation. The combination of roller 63 and the chute allows for precise control of the movement trajectory.

[0041] The filtration conveying mechanism 6 is equipped with a distilled water pipe rack 8, which includes a frame and a water supply pipe 81 at the top. Several spray nozzles 82 are located on the side wall of the water supply pipe 81, corresponding to the filter tank 62. The water supply pipe 81 is connected to distilled water. An electric valve is installed at the inlet of the water supply pipe, and two valve switches are installed on the inclined section of the chute. The electric valve is electrically connected to the two valve switches. When the filter tank 62 moves to the valve switch on the inclined section of the chute, the electric valve of the water supply pipe is activated, and the spray nozzles 82 on the water supply pipe spray water into the filter tank, cleaning the gel. When the filter tank 62 moves to the second valve switch, the electric valve closes, reducing resource waste. The water supply pipe contains distilled water, and cleaning with distilled water prevents secondary contamination of the gel. By installing the distilled water pipe rack 8 on the filtration conveying mechanism 6, the gel in the filter tank 62 can be thoroughly cleaned, and the contamination of the gel by flocculants can be reduced. The distilled water used to clean the gel enters the box 61 through the perforations on the filter tank 62, thus enabling the recycling of distilled water.

[0042] The ceramic membrane filter 3 includes a housing 31, within which a ceramic membrane 32 is disposed. Annular limiting plates 33 are threadedly connected to the inner walls at both ends of the housing 31. Handles 34 are hinged to the limiting plates 33. The bottom surface of the limiting plates 33 is sealed to one end of the ceramic membrane 32 via a sealing ring. The threaded connection of the limiting plates 33 ensures greater stability and reliability of the ceramic membrane filter 3 during use. The hinged handles 34 on the limiting plates 33 facilitate disassembly and cleaning of the ceramic membrane filter 3, improving maintenance efficiency. The sealing connection between the limiting plates 33 and one end of the ceramic membrane 32 effectively prevents wastewater leakage from the gaps in the ceramic membrane filter 3, ensuring the effectiveness of wastewater treatment.

[0043] The bottom of the reactor 5 is equipped with a discharge pipe 53, the end of which is above the filter tank 62. The discharge pipe 53 has a bend, and the filter tank 62 is lined with filter paper. The bend at the outlet of the discharge pipe 53 buffers the mixture within the filter tank 62, reducing collisions as it enters and preventing splashing, thus improving wastewater treatment efficiency. The filter paper at the bottom of the filter tank 62 effectively separates the mixture into gel and filtrate. The filter paper is easy to replace and maintain, improving the reliability and service life of the filter tank 62.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A filtration system for mulberry silk wastewater, comprising a tank (1), wherein a ceramic membrane filter (3) is connected to the tank (1) via a feed pipe, and a water pump (2) is installed on the feed pipe, characterized in that: The permeation end of the ceramic membrane filter (3) is connected to the reactor (5), the retention end of the ceramic membrane filter (3) is connected to the concentrate storage tank (4), the reactor (5) is equipped with a stirring shaft (52) driven by a motor, the top of the reactor (5) is equipped with a feeding port (51), the discharge port of the reactor (5) is connected to a filter conveying mechanism (6), and the filter conveying mechanism (6) is connected to the material box of the drying device (7). The filter conveying mechanism (6) includes a box body (61), a filter groove (62) is provided inside the box body (61), a number of filter holes are provided at the bottom of the filter groove (62), two fixed shafts are provided on both sides of the filter groove (62), and rollers (63) are rotatably connected on the fixed shafts. One of the rollers (63) is connected to a drive motor (64). Slide grooves are provided on both sides of the box body (61), and the rollers (63) move in the slide grooves. The slide grooves include a first horizontal section and a vertical section. An inclined section is provided between the vertical section and the first horizontal section of the chute. A second horizontal section (65) is provided on the side wall of the box (61). The second horizontal section (65) is connected to the inclined section, and the bottom surface of the second horizontal section (65) is connected to the bottom surface of the first horizontal section. A movable plate (66) is slidably provided at the connection point. The bottom surface of the movable plate (66) is connected to the bottom surface of the second horizontal section (65) through several telescopic rods. The movable plate (66) covers the bottom surface of the filter tank (62). An inclined plate (67) is hinged at the connection point between the second horizontal section (65) and the inclined section, and the hinge is located above the second horizontal section (65). The inclined plate (67) coincides with the side wall of the inclined section.

2. The mulberry silk wastewater filtration system according to claim 1, characterized in that: The filter conveying mechanism (6) is provided with a distilled water pipe rack (8). The distilled water pipe rack (8) includes a frame body. A water supply pipe (81) is provided on the top of the frame body. Several water spray nozzles (82) are provided on the side wall of the water supply pipe (81). The water spray nozzles (82) correspond to the filter tank (62).

3. The filtration system for silkworm wastewater according to claim 1, characterized in that: The ceramic membrane filter (3) includes a housing (31), a ceramic membrane (32) is disposed inside the housing (31), and an annular limiting plate (33) is threaded to the inner sidewalls at both ends of the housing (31). A handle (34) is hinged on the limiting plate (33), and the bottom surface of the limiting plate (33) is sealed to one end of the ceramic membrane (32) through a sealing ring.

4. The mulberry silk wastewater filtration system according to claim 1, characterized in that: The bottom of the reactor (5) is provided with a discharge pipe (53), the end of the discharge pipe (53) is above the filter tank (62), and the discharge pipe (53) is provided with a bend. The filter tank (62) is provided with a filter paperboard inside.

5. The filtration system for silkworm silk wastewater according to claim 1, characterized in that: The drying device (7) is a spray dryer or a heated molding die.

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