Ethyl acetate industrial waste liquid treatment process and treatment device

Abstract

The invention relates to the technical field of acetic ether waste liquid treatment, in particular to an acetic ether industrial waste liquid treatment process and device, and the process comprises the following steps: S1, removing large solid impurities in waste liquid by adopting grids; s2, homogenizing and equalizing the waste liquid obtained in the step S1 by adopting an adjusting tank; s3, removing ethyl acetate, suspended matters and part of organic matters from the waste liquid obtained in S2 through air flotation treatment; s4, sequentially carrying out biochemical treatment and aerobic biological treatment on the waste liquid obtained in S3 by adopting an anaerobic bioreactor and an activated sludge process; s5, performing flocculation treatment on the waste liquid in the step S4, then performing disinfection treatment, and finally discharging the waste liquid; according to the method, the waste liquid is subjected to large impurity interception, homogenization and homogenization, air floatation treatment, COD (Chemical Oxygen Demand) reduction, organic matter reduction, flocculating constituent removal and sterilization in sequence through the steps S1-S5, so that acetic ether in the industrial waste liquid is treated, and meanwhile, purified waste water is discharged or utilized.

Description

Technical Field

[0001] The present invention relates to the technical field of ethyl acetate waste liquid treatment, and in particular to a ethyl acetate industrial waste liquid treatment process and a treatment device. Background Art

[0002] Ethyl acetate is a commonly used organic solvent in the coatings, inks, adhesives, pharmaceuticals and other industries. Industrial waste liquid mainly comes from cleaning, distillation residues, product separation and other links in the production process. For example: in the coatings industry, it contains impurities such as pigments and resins; in the ink industry, it may contain heavy metal additives; in the pharmaceutical industry, it may be mixed with other organic solvents. Ethyl acetate is volatile, highly water-soluble (approximately 3%), low in toxicity but irritating.

[0003] At present, flotation is used to remove ethyl acetate, suspended matter and some organic matter from waste liquid containing ethyl acetate. The equipment used is an air flotation machine. The air flotation machine is an air flotation releaser in the dissolved air system that generates a large number of fine bubbles in the water. The air is attached to the suspended matter particles in the form of highly dispersed tiny bubbles, resulting in a state with a density lower than that of water. The buoyancy principle is used to make the suspended matter float on the water surface, thereby achieving solid-liquid separation. Initially, when the air flotation machine removes the scum on the liquid surface, it directly makes the liquid surface just overflow the isolation plate of the box, allowing the scum to flow directly into the scum tank along with part of the waste liquid. However, this puts a lot of pressure on the waste liquid filtering device in the scum tank. The improved method is to install a scraper on the surface of the flotation machine, such as the structure in invention patents: CN118125543A and CN118877997A. A scraper driven by a chain sprocket is used to scrape the scum from one end of the flotation machine to the scum tank at the other end, and the scum is scraped as much as possible while scraping less waste liquid into the scum tank. Although it solves the problem of a large amount of waste liquid entering the scum tank along with the scum, the removal of the scum becomes intermittent scraping, no longer continuous removal, resulting in more scum floating on the side of the box near the flotation releaser. The buoyancy of the liquid can only support scum of a certain thickness, resulting in either increasing the number of scrapers or increasing the speed of the scrapers. For this purpose, we provide a new scum treatment device.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to design a process and device for treating ethyl acetate industrial wastewater, which continuously treats scum and reduces the amount of wastewater entering the scum tank, so as to solve the above-mentioned shortcomings in the technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an ethyl acetate industrial waste liquid treatment device, used for flotation treatment of ethyl acetate industrial waste liquid to separate scum, comprising an upwardly open box, an air flotation releaser installed at one end of the box, and an isolation plate fixedly installed in the box, a scum trough formed between the isolation plate and the box, a plurality of array-distributed transmission shafts rotatably installed between the isolation plate and the box, the transmission shaft having spiral blades, a section of the spiral blades close to the scum trough not fixedly connected to the transmission shaft, and a section of the spiral blades away from the scum trough fixedly connected to the transmission shaft, a positioning piece fixedly installed on the transmission shaft close to one end of the scum trough, a spring fixedly installed between the positioning piece and the spiral blade, a toggle member installed in the box, a surface of a section of the spiral blade not fixedly connected to the transmission shaft cooperates with a surface of the toggle member; The spiral blade rotates to push the floating scum in the box to the isolation plate. The spiral blade gradually compresses and stretches the spring away from the scum groove due to contact with the toggle piece. When the spiral blade separates from the toggle piece, the spiral blade pushes the floating scum into the scum groove under the action of the spring.

[0007] Preferably, the toggle member includes a connecting plate fixedly connected to the box body, a plurality of vertical plates fixedly mounted on the connecting plate, and a toggle block fixedly mounted on the vertical plates, and one toggle block corresponds to one of the spiral blades and fits therewith.

[0008] Preferably, the spiral blade includes a fixed blade fixedly connected to the transmission shaft, and a pushing blade slidably connected to the transmission shaft, the end of the pushing blade is fixedly connected to the end of the fixed blade, and the other end of the pushing blade is fixedly connected to the end of the spring, the pushing blade is in contact with the side of the toggle block, and the pushing blade is restricted by the toggle block when rotating, thereby reducing the size of the pitch along the transmission shaft.

[0009] Preferably, the distance between the two transmission shafts is smaller than the outer diameter of the spiral blade and larger than 1 / 2 of the outer diameter of the spiral blade.

[0010] Preferably, when the pitch of the pushing blade is reduced and the corresponding spring is stretched, neither the spring nor the pushing blade comes into contact with the vertical plate.

[0011] Preferably, a horizontally arranged baffle is fixedly mounted on one side of the isolation plate close to the push blade, and when the pitch of the push blade is not reduced, there is a gap between the push blade and the isolation baffle.

[0012] Preferably, a triangular plate is fixedly installed between the isolation plate and the connecting plate, and an unsealed accommodating cavity is formed between the top of the triangular plate and the side wall of the connecting plate.

[0013] Preferably, the top surfaces of the toggle block and the vertical plate, and the central axis of the transmission shaft are all in the same horizontal plane.

[0014] Preferably, the bottom of the inner cavity of the box body is provided with a plurality of sediment troughs, a partition plate is fixedly installed on the bottom surface of the inner cavity of the box body, a water inlet pipe is fixedly installed on one side of the box body, and a drain pipe is fixedly installed on the other side of the box body.

[0015] Preferably, both ends of the transmission shaft pass through the box body and are fixedly mounted with driving wheels, a driven wheel rotatably connected to the side wall of the box body is engaged between two adjacent driving wheels, and a pulley is also mounted on one of the transmission shafts; In a second aspect, the present invention further provides a treatment process for operating the above-mentioned ethyl acetate industrial waste liquid treatment device to treat waste liquid, comprising the following steps: S1. Use a grid to remove larger solid impurities in the wastewater; S2. Use a regulating tank to homogenize and equalize the waste liquid obtained in S1; S3 S2 obtained by flotation treatment to remove ethyl acetate, suspended matter and part of the organic scum formed; S4. The waste liquid obtained in S3 is sequentially subjected to biochemical treatment and aerobic biological treatment using an anaerobic bioreactor and an activated sludge method; S5. The waste liquid in S4 is subjected to flocculation treatment and then disinfected before being discharged.

[0016] In the above technical solution, the technical effects and advantages provided by the present invention are: The present invention sequentially performs steps S1 to S5 on the waste liquid, intercepting larger impurities, homogenizing and equalizing the amount, flotation treatment, reducing COD, reducing organic matter, removing flocs, and sterilizing, thereby treating ethyl acetate in the industrial waste liquid and purifying the waste water for discharge or utilization. The present invention provides an array of spiral blades on the box body, so that when the spiral blades rotate, they automatically push the scum on one side of the flotation releaser to the side of the scum trough, and the scum will not accumulate on the side of the flotation releaser, and the scum can be cleaned continuously; At the same time, the present invention configures the spiral blades as fixed blades and push blades, and combines the coordination between the toggle member, the spring, and the positioning plate, so that each time the transmission shaft drives the spiral blade to rotate one circle, the scum on one side of the isolation plate is pushed into the scum tank, thereby cleaning the scum. Compared with the method of using flowing waste liquid to clean the scum when the liquid level just overflows the isolation plate, the amount of waste liquid entering the scum tank is reduced. At the same time, the present invention installs a triangular plate and a baffle on one side of the isolation plate, so that when the spiral blade pushes the scum and waste liquid toward the isolation plate, the waste liquid below hits the triangular plate and the isolation plate and then folds back under the baffle, colliding with the waste water pushed by the spiral blade above, thereby temporarily raising the liquid level, making it easier for the part above the spiral blade close to the isolation plate to push more scum on the liquid surface into the scum trough. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a flow chart of the ethyl acetate industrial waste liquid treatment process of the present invention; Figure 2 A schematic diagram of the treatment device of the present invention containing scum; Figure 3 Schematic diagram of the internal structure of the processing device of the present invention; Figure 4 A top view of the processing device of the present invention; Figure 5 is a side sectional view of the processing device of the present invention; Figure 6 Schematic diagram of the distribution of spiral blades and toggle members of the present invention; Figure 7 A side view of the spiral blade and the toggle member of the present invention; Figure 8 It is a three-dimensional diagram of the toggle member of the present invention.

[0019] Description of reference numerals: 1. Box body; 2. Air flotation releaser; 3. Isolation plate; 4. Scum trough; 5. Drive shaft; 6. Spiral blade; 6a. Fixed blade; 6b. Push blade; 7. Positioning plate; 8. Spring; 9. Toggle member; 9a. Connecting plate; 9b. Vertical plate; 9c. Toggle block; 10. Baffle; 11. Triangular plate; 12. Accommodating chamber; 13. Scum trough; 14. Partition plate; 15. Water inlet pipe; 16. Drain pipe; 17. Driving wheel; 18. Driven wheel; 19. Pulley. DETAILED DESCRIPTION

[0020] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] The present invention provides Figure 2-8 The device for treating industrial wastewater of ethyl acetate is shown, and is used for flotation treatment of scum in the process of treating industrial wastewater of ethyl acetate. The device comprises an upwardly open housing 1 of the flotation machine. The bottom of the inner cavity of the housing 1 is provided with multiple sludge troughs 13 and a partition plate 14. A water inlet pipe 15 and a flotation releaser 2 are installed between the partition plate 14 and the inner wall of the housing 1. A separation plate 3 is installed to form a sludge trough 4. A drain pipe 16 is installed on the side of the housing 1 away from the water inlet pipe 15. When the water inlet pipe 15 discharges wastewater into the space between the partition plate 14 and the inner wall of the housing 1, the flotation releaser 2 releases a large number of fine bubbles. The air is attached to the suspended particles in the wastewater in the form of highly dispersed tiny bubbles, resulting in a state with a density less than that of water. The air is floated on the water surface by the principle of buoyancy, while some large particles settle into the sludge trough 13. The filtered water in the middle layer is discharged through the drain pipe 16. We rotatably install multiple array-distributed transmission shafts 5 between the isolation plate 3 and the box body 1, and set a spiral blade 6 on the transmission shaft 5. The section of the spiral blade 6 close to the isolation plate 3 is not welded to the transmission shaft 5, but is directly slidably connected on it to form a push blade 6b. The large section of the spiral blade 6 away from the isolation plate 3 is welded to the transmission shaft 5 to form a fixed blade 6a. A driving wheel 17 is fixedly installed at the end of the transmission shaft 5. A driven wheel 18 rotatably connected to the side wall of the box body 1 is meshed between two adjacent driving wheels 17. A pulley 19 is also installed on one of the transmission shafts 5. By controlling the flow rates of the water inlet pipe 15 and the drain pipe 16, we can control the height of the liquid level, and thus control the height of the scum floating on the liquid surface. The height of the liquid level is preferably on the same horizontal plane as the central axis of the transmission shaft 5. In this way, when the pulley 19 drives the transmission shaft 5 to rotate, the transmission shaft 5 will rotate synchronously through the engagement of the driving wheel 17 and the driven wheel 18, thereby driving the spiral blade 6 to rotate synchronously, so that the scum from one side of the box body 1 will be gradually driven to the side of the box body 1 close to the isolation plate 3. At this time, the amount of scum on the liquid surface of the box body 1 close to the isolation plate 3 is greater than the amount on the other side of the box body 1. At this time, we fix the connecting plate 9a in the box body 1, fix a plurality of vertical plates 9b matching the transmission shaft 5 on the connecting plate 9a, and fix a toggle block 9c on the vertical plate 9b. The three constitute the toggle member 9, and the toggle block 9c contacts the surface of the push blade 6b. Figure 3 As shown, when the push blade 6b rotates counterclockwise, the surface of the push blade 6b contacts the surface of the toggle block 9c for limiting, and the push blade 6b will gradually be squeezed axially by the transmission shaft 5, so that the pitch is reduced. When the transmission shaft 5 rotates one circle, the push blade 6b is separated from the toggle block 9c, and the push blade 6b has a reset movement under the action of its own elasticity, generating thrust on the liquid surface. In order to assist the push blade 6b to reset, a positioning piece 7 is fixedly installed on the transmission shaft 5, and a spring 8 is fixedly installed between the positioning piece 7 and the push blade 6b. Therefore, the spring 8 is stretched as the pitch of the push blade 6b decreases to generate elastic force. This elastic force assists the push blade 6b to reset and then pushes the scum on the liquid surface to surge towards the isolation plate 3. After the scum overflows the isolation plate 3, it will be transferred into the scum tank 4. At the same time, a small amount of waste liquid will also enter the scum tank 4. The scum tank 4 is equipped with a liquid filtering and recovery device commonly used in the prior art to filter a small amount of waste liquid. The distance between the two transmission shafts 5 is set to be smaller than the outer diameter of the spiral blades 6 and larger than 1 / 2 of the outer diameter of the spiral blades 6. In this way, when the spiral blades 6 rotate, they can push the scum on the liquid surface to move, avoiding the presence of a portion of the liquid surface between the two spiral blades 6 that is not in contact with the spiral blades 6, causing this portion of scum to remain suspended on the liquid surface. The top surfaces of the toggle block 9c and the vertical plate 9b, as well as the central axis of the transmission shaft 5, are arranged to be in the same horizontal plane, so that the spiral blade 6 and the toggle block 9c can share time. The pushing blade 6b above the liquid surface can push the scum a longer distance, reducing the pushing amount of the pushing blade 6b below the liquid surface, reducing the pushing amount of waste liquid, and increasing the pushing amount of scum, further improving the cleaning efficiency of scum. And we fixedly installed a triangular plate 11 between the isolation plate 3 and the connecting plate 9a, and formed an unsealed accommodating cavity 12 between the top of the triangular plate 11 and the side wall of the connecting plate 9a. At the same time, a horizontally arranged baffle 10 is fixedly installed on the side of the isolation plate 3 close to the pushing blade 6b. When the pitch of the pushing blade 6b is not reduced, there is a gap between the pushing blade 6b and the isolation baffle 10. The gap is to prevent collision. At the same time, the baffle 10 allows the pushing blade 6b to push a small amount of waste liquid and most of the scum as much as possible. When the waste liquid is pushed under the push blade 6b without overflowing the baffle 10, it will hit the triangular plate 11 after entering the accommodating chamber 12, and then bend back, colliding with the waste liquid pushed by the subsequent push blade 6b, thereby causing the liquid level between the push blade 6b and the baffle 10 to rise temporarily, so that the push blade 6b can push the scum above and below the liquid surface into the scum groove 4. When the pitch of the push blade 6b is reduced and the corresponding spring 8 is stretched, the spring 8 and the push blade 6b are no longer in contact with the vertical plate 9b. The specific working process is as follows: waste liquid enters the box body 1 through the water inlet pipe 15, and the flotation releaser 2 releases a large number of fine bubbles to cause ethyl acetate, suspended matter and some organic matter in the waste water to form scum. Then, the pulley 19 rotates to drive all the spiral blades 6 to rotate and push the scum to the side of the isolation plate 3, so that most of the scum on the liquid surface is continuously removed. During the rotation of the pushing blade 6b, the toggle member 9 is compressed by reducing the pitch. When the toggle member 9 and the pushing blade 6b are separated, the pushing blade 6b is reset under the action of the spring 8, thereby pushing the scum on the side of the isolation plate 3 into the scum trough 4, thereby achieving the step of intermittently concentrating the scum in the box body 1 into the scum trough 4. Combined with an ethyl acetate industrial waste liquid treatment device, such as Figure 1 As shown, the present invention also provides a treatment process for operating the above-mentioned ethyl acetate industrial waste liquid treatment device to treat waste liquid, comprising the following steps: S1: Use the screen to intercept larger solid impurities in the waste liquid, such as packaging materials, raw material residues, etc., to prevent them from entering the subsequent processing equipment; S2: Homogenization in the regulating tank. Since the quality and quantity of the waste liquid fluctuate greatly, the regulating tank is used to homogenize and equalize the quantity, making the quality and quantity of the waste liquid relatively stable and convenient for subsequent treatment. S3: Flotation treatment: For waste liquid containing ethyl acetate, flotation is used to remove ethyl acetate, suspended matter and some organic matter in the waste liquid; S4: Using anaerobic bioreactors, anaerobic microorganisms decompose some of the organic matter in the wastewater into gases such as methane and carbon dioxide, reducing the COD of the wastewater, and then using activated sludge method, biofilm method, etc. to further remove organic matter, ammonia nitrogen and other pollutants; S5: Flocculation treatment is used to form suspended matter, colloids, etc. in the water into flocs, which are removed through sedimentation tanks. Sand filtration, activated carbon filtration and other filtration methods are then used to further remove pollutants such as organic matter and color in the waste liquid. Ultraviolet disinfection, chlorine dioxide disinfection and other methods are then used to kill pathogenic microorganisms in the waste liquid, and finally the waste liquid is discharged or utilized.

[0023] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should readily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., the size, scale, structure, shape and proportion of various components, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientation changes, etc.).

Claims

1. An ethyl acetate industrial waste liquid treatment device for flotation treatment of wastewater to separate scum, comprising an upwardly open box (1), a flotation releaser (2) installed at one end of the box (1), and an isolation plate (3) fixedly installed in the box (1), a scum groove (4) formed between the isolation plate (3) and the box (1), characterized in that: A plurality of array-distributed transmission shafts (5) are rotatably mounted between the isolation plate (3) and the housing (1), and the transmission shaft (5) is provided with a spiral blade (6). A section of the spiral blade (6) close to the scum groove (4) is not fixedly connected to the transmission shaft (5), and a section of the spiral blade (6) away from the scum groove (4) is fixedly connected to the transmission shaft (5). A positioning piece (7) is fixedly mounted on one end of the transmission shaft (5) close to the scum groove (4), and a spring (8) is fixedly mounted between the positioning piece (7) and the spiral blade (6). A toggle member (9) is mounted in the housing (1), and a surface of a section of the spiral blade (6) not fixedly connected to the transmission shaft (5) cooperates with a surface of the toggle member (9); The spiral blade (6) rotates to push the floating scum in the box (1) to the isolation plate (3). The spiral blade (6) gradually compresses and stretches the spring (8) away from the scum groove (4) due to contact with the toggle member (9). When the spiral blade (6) separates from the toggle member (9), the spiral blade (6) pushes the floating scum into the scum groove (4) under the action of the spring (8).

2. The ethyl acetate industrial waste liquid treatment device according to claim 1, characterized in that: The toggle member (9) comprises a connecting plate (9a) fixedly connected to the box body (1), a plurality of vertical plates (9b) fixedly mounted on the connecting plate (9a), and a toggle block (9c) fixedly mounted on the vertical plate (9b), wherein one toggle block (9c) corresponds to one spiral blade (6) and fits therewith.

3. The ethyl acetate industrial waste liquid treatment device according to claim 2, characterized in that: The spiral blade (6) includes a fixed blade (6a) fixedly connected to the transmission shaft (5), and a pushing blade (6b) slidably connected to the transmission shaft (5), the end of the pushing blade (6b) is fixedly connected to the end of the fixed blade (6a), and the other end of the pushing blade (6b) is fixedly connected to the end of the spring (8), and the pushing blade (6b) is fitted with the side of the toggle block (9c). When the pushing blade (6b) rotates, it is restricted by the toggle block (9c) and the pitch is reduced along the transmission shaft (5).

4. The ethyl acetate industrial waste liquid treatment device according to claim 3, characterized in that: The distance between the two transmission shafts (5) is smaller than the outer diameter of the spiral blade (6) and larger than 1 / 2 of the outer diameter of the spiral blade (6).

5. The ethyl acetate industrial waste liquid treatment device according to claim 3, characterized in that: When the pitch of the pushing blade (6b) is reduced and the corresponding spring (8) is stretched, neither the spring (8) nor the pushing blade (6b) comes into contact with the vertical plate (9b).

6. The ethyl acetate industrial waste liquid treatment device according to claim 3, characterized in that: A horizontally arranged baffle (10) is fixedly mounted on one side of the isolation plate (3) close to the push blade (6b); when the pitch of the push blade (6b) is not reduced, a gap exists between the push blade (6b) and the isolation baffle (10).

7. The ethyl acetate industrial waste liquid treatment device according to claim 2, characterized in that: A triangular plate (11) is fixedly installed between the isolation plate (3) and the connecting plate (9a), and a non-sealed accommodating cavity (12) is formed between the top of the triangular plate (11) and the side wall of the connecting plate (9a).

8. The ethyl acetate industrial waste liquid treatment device according to claim 2, characterized in that: The top surfaces of the toggle block (9c) and the vertical plate (9b), as well as the central axis of the transmission shaft (5) are all located in the same horizontal plane.

9. The ethyl acetate industrial waste liquid treatment device according to claim 1, characterized in that: The bottom of the inner cavity of the box (1) has a plurality of sediment troughs (13), and a partition plate (14) is fixedly installed on the bottom surface of the inner cavity of the box (1). A water inlet pipe (15) is fixedly installed on one side of the box (1), and a drain pipe (16) is fixedly installed on the other side of the box (1). The ends of the transmission shaft (5) both pass through the box (1) and are fixedly installed with driving wheels (17). A driven wheel (18) rotatably connected to the side wall of the box (1) is meshed between two adjacent driving wheels (17), and a pulley (19) is also installed on one of the transmission shafts (5).

10. A process for treating ethyl acetate industrial waste liquid, used for operating the ethyl acetate industrial waste liquid treatment device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Use a grid to remove larger solid impurities in the wastewater; S2. Use a regulating tank to homogenize and equalize the waste liquid obtained in S1; S3. The waste liquid obtained in S2 is treated by flotation to remove ethyl acetate, suspended solids and some organic matter; S4. The waste liquid obtained in S3 is sequentially subjected to biochemical treatment and aerobic biological treatment using an anaerobic bioreactor and an activated sludge method; S5. The waste liquid in S4 is subjected to flocculation treatment and then disinfected before being discharged.

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