Methyl ester wastewater treatment device in saccharin production

Abstract

The invention discloses a methyl ester wastewater treatment device in saccharin production, and relates to the technical field of wastewater treatment equipment. Comprising an adjusting cylinder, a coagulation cylinder, a biological reaction cylinder, two particle separators and a plurality of groups of delivery pumps. Waste water enters the adjusting cylinder after being subjected to primary impurity removal through the particle separator I, and the PH of the waste water is adjusted through cooperation of the circulating stirring structure and the acid-base property adjusting mechanism; the wastewater is subjected to secondary impurity removal through a second particle separator and then enters a coagulation cylinder to be mixed with a flocculation agent to generate flocculate, and a turbidity detection sensor is matched with a liquid extraction branch pipe to screen qualified wastewater; qualified wastewater enters the biological reaction cylinder, deep degradation is realized through the MBR and the aeration system, and a floating ball drives a shaking frame and a vibrating inner plate to prevent membrane blockage; after flocculate is separated by the treatment box, wastewater is recycled and reused; the device is compact in structure and high in automation degree, can efficiently remove wastewater impurities and refractory pollutants, ensures that wastewater reaches the standard and is discharged, and meets the large-scale wastewater treatment requirement of saccharin production.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a device for treating methyl ester wastewater from saccharin production. Background Technology

[0002] Saccharin is a widely used artificial sweetener. Its production involves multiple steps of reaction, using phthalic anhydride and other raw materials. The esterification stage generates a large amount of methyl ester wastewater. This wastewater is characterized by its large volume, complex composition (containing methyl ester, unreacted raw materials, etc.), high pollutant concentration, large fluctuations in water quality, unstable acidity / alkalinity, and the fact that some pollutants are difficult to biodegrade. Direct discharge would severely pollute the environment and threaten human health; therefore, it must undergo strict treatment to meet standards before discharge or recycling.

[0003] Currently, saccharin methyl ester wastewater treatment mostly employs single or simple combined processes, which suffer from numerous drawbacks such as inadequate pretreatment, poor homogenization and conditioning effects, insufficient synergy between coagulation and flocculant treatment, and low deep degradation efficiency. Furthermore, these processes often involve unreasonable equipment layouts, low levels of automation, unstable operation, and high maintenance costs, making it difficult to meet the demands of efficient and stable environmental treatment and large-scale industrial production. Therefore, this application proposes a saccharin methyl ester wastewater treatment device to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device for treating methyl ester wastewater in saccharin production, which solves the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a methyl ester wastewater treatment device for saccharin production, comprising a regulating cylinder, a coagulation cylinder, a wastewater inlet pump, a first transfer pump, a second transfer pump, a first particle separator, a second particle separator, a discharge pump, and a biological reaction cylinder. The input end of the wastewater inlet pump is connected to the output end of the first particle separator, and the output end of the first particle separator is connected to a wastewater inlet pipe. The output end of the wastewater inlet pipe extends into the regulating cylinder. A circulating stirring structure and an acid-base adjustment mechanism are provided on the outside of the regulating cylinder. The input end of the first transfer pump is connected to a first suction pipe, which is located away from... One end of transfer pump one extends into the regulating cylinder. The output end of transfer pump one is connected to the input end of particle separator two. The output end of particle separator two is connected to outlet pipe two. The output end of outlet pipe two extends into the coagulation cylinder. The lower end of the coagulation cylinder is conical. A flocculant treatment mechanism is provided on the outside of the coagulation cylinder. The input end of transfer pump two is connected to liquid extraction pipe two. The output end of transfer pump two is connected to outlet pipe three. The output end of outlet pipe three extends into the bioreactor. An MBR biofilm reactor is provided inside the bioreactor. The output end of the discharge pump is connected to the output end of the MBR biofilm reactor.

[0006] Preferably, the circulating stirring mechanism includes a circulating pump and an ejector. The input end of the circulating pump is connected to a circulating pipe. The end of the circulating pipe away from the circulating pump passes through the lower side wall of the regulating cylinder and is connected to the regulating cylinder. The output end of the circulating pump is connected to the input end of the ejector. The output end of the ejector is connected to an ejector pipe. The ejector pipe passes through the side wall of the regulating cylinder and is connected to the regulating cylinder. The side wall of the suction chamber of the ejector is connected to an air inlet pipe. The air inlet end of the air inlet pipe extends upward to below the acid-base adjustment mechanism.

[0007] Preferably, the jet tube extends into the regulating cylinder along the tangential direction of the inner sidewall of the regulating cylinder, and a liquid outlet spiral tube is provided inside the regulating cylinder. The input end of the liquid outlet spiral tube is connected to a liquid distribution tube, and the end of the liquid distribution tube away from the liquid outlet spiral tube is connected to the jet tube. Several liquid outlets are provided on the sidewall of the liquid outlet spiral tube, and the liquid outlets are inclined downward.

[0008] Preferably, the acid-base adjustment mechanism includes an alkaline storage tank, an acidic storage tank, an alkaline supply pump, and an acidic supply pump. The output end of the alkaline supply pump is connected to the alkaline storage tank, and the output end of the acidic supply pump is connected to the acidic storage tank. The output ends of both the alkaline and acidic supply pumps are connected to a supply pipe. The output ends of both supply pipes are connected to an air inlet pipe. A pressure balance pipe is connected to the side wall of the supply pipe. A one-way air inlet valve is provided on both pressure balance pipes and the air inlet pipe. The one-way air inlet valve on the air inlet pipe is located above the connection between the supply pipe and the air inlet pipe.

[0009] Preferably, the second outlet pipe is connected to the first outlet pipe, the inner wall of the coagulation cylinder is fixedly connected to the dosing cylinder, the upper end of the dosing cylinder is provided with a dosing port, the output end of the first outlet pipe passes through the side wall of the coagulation cylinder and the side wall of the dosing cylinder in sequence, the first outlet pipe is connected to the dosing cylinder, and the side wall of the dosing cylinder is provided with a liquid outlet.

[0010] Preferably, a plurality of liquid extraction branch pipes are connected to the two side walls of the liquid extraction pipe, and a solenoid valve is provided on the liquid extraction branch pipe. The input end of the liquid extraction branch pipe passes through the side wall of the coagulation cylinder and extends to the inside of the coagulation cylinder. A turbidity detection sensor is provided below the outer side wall of the liquid extraction branch pipe, and the turbidity detection sensor is located inside the coagulation cylinder.

[0011] Preferably, the flocculant treatment mechanism includes a flocculant treatment tank, a sludge discharge pump, a negative pressure pump, and a recovery pump. The input end of the sludge discharge pump is connected to a sludge discharge pipe, and the output end of the sludge discharge pipe passes through the lower side wall of the coagulation cylinder and is connected to the coagulation cylinder. The output end of the sludge discharge pump passes through the upper side wall of the flocculant treatment tank and is connected to the flocculant treatment tank. A filter membrane is provided inside the flocculant treatment tank. The negative pressure output end of the negative pressure pump is connected to the flocculant treatment tank. The connection point between the negative pressure output end of the negative pressure pump and the flocculant treatment tank is located below the filter membrane. A liquid level detection sensor is provided below the connection point between the negative pressure output end of the negative pressure pump and the flocculant treatment tank. The input end of the recovery pump passes through the side wall of the flocculant treatment tank and is connected to the flocculant treatment tank. The output end of the recovery pump is connected to a recovery pipe, and the end of the recovery pipe away from the recovery pump extends to the inside of the coagulation cylinder.

[0012] Preferably, the MBR biofilm reactor includes a fixed frame disposed inside a bioreactor. A swaying frame and several sets of planar membranes are disposed inside the fixed frame. Several vibrating inner plates are fixedly connected to the inner wall of the swaying frame. The vibrating inner plates and the several sets of planar membranes are arranged alternately. Limiting frames are fixedly connected to the upper ends of the left and right side walls of the fixed frame. L-shaped limiting rods are fixedly connected to the left and right side walls of the swaying frame. The upper ends of the two limiting rods pass through the left and right limiting frames respectively and are fixedly connected to floating balls.

[0013] Preferably, an aeration pump is provided on the outside of the bioreactor, an aeration pipe is provided on the inside of the bioreactor, and a plurality of aeration heads are connected to the side wall of the aeration pipe by a plurality of flexible connecting pipes, and the output end of the aeration pump is connected to the aeration pipe.

[0014] Compared with related technologies, the methyl ester wastewater treatment device provided by the present invention has the following beneficial effects: 1. This invention provides a methyl ester wastewater treatment device for saccharin production. It achieves graded impurity interception through a two-stage particle separator, thoroughly removing suspended particles and insoluble pollutants from the wastewater, avoiding clogging of subsequent components, extending equipment life, and solving the problem of inadequate pretreatment in existing systems. The regulating cylinder, combined with circulating stirring and a precise acid-base adjustment mechanism, achieves uniform mixing and stable pH control of the wastewater, avoiding problems such as uneven local concentration and incomplete reaction, laying a good foundation for subsequent treatment.

[0015] 2. This invention provides a methyl ester wastewater treatment device for saccharin production. The coagulation cylinder and the flocculant treatment mechanism are linked to achieve thorough mixing of wastewater and flocculant, and efficient separation of flocculants. The separated clean water can be recycled and reused, reducing water waste and secondary pollution, and solving the shortcomings of insufficient synergy in existing coagulation treatment. The MBR biofilm reactor works in conjunction with the aeration system to improve the degradation efficiency of recalcitrant organic matter and the solid-liquid separation effect, ensuring that the wastewater is stably discharged in compliance with standards, and making up for the problem of low efficiency in existing deep treatment.

[0016] 3. This invention provides a methyl ester wastewater treatment device for saccharin production. The device includes multiple extraction branches and a turbidity detection sensor, enabling precise collection of wastewater. Wastewater with higher turbidity is sent to a flocculation treatment tank for reprocessing, ensuring the influent turbidity meets standards. Simultaneously, it is equipped with automated structures such as turbidity detection sensors and solenoid valve control, achieving continuous automated operation, reducing manual labor intensity, and solving the problems of large footprint and low automation in existing devices. The mature and reliable design of each component, combined with the cooperative structure of the shaking frame, vibrating inner plate, and floating ball, effectively prevents MBR membrane module clogging, reduces equipment failure rate and maintenance frequency, improves the device's economy and practicality, and meets the needs of large-scale industrial production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the bottom structure of the liquid storage spiral tube of the present invention; Figure 3 This is a three-dimensional structural diagram of the concrete cylinder location cross-section of the present invention; Figure 4 This is a schematic diagram of the cross-sectional view of the concrete cylinder of the present invention from another angle; Figure 5 For the present invention Figure 4 Enlarged view of a portion of point A in the middle; Figure 6 This is a cross-sectional three-dimensional structural diagram of the flocculant treatment box of the present invention; Figure 7 This is a three-dimensional cross-sectional structural diagram of the bioreactor of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of a section at point B in the middle; Figure 9 This is a three-dimensional structural diagram of the vibration inner plate of the present invention; Figure 10 This is a three-dimensional structural diagram of the acid-base adjustment mechanism of the present invention.

[0018] In the diagram: 1. Regulating cylinder; 2. Coagulation cylinder; 3. Bioreactor; 4. Particle separator one; 5. Wastewater inlet pipe; 6. Wastewater inlet pump; 7. Particle separator two; 8. Flocculation treatment tank; 9. Acid-base adjustment mechanism; 901. Alkaline storage tank; 902. Acidic storage tank; 903. Alkaline supply pump; 904. Acidic supply pump; 905. Supply pipe; 906. Pressure balancing pipe; 10. Circulation pump; 11. Circulation pipe; 12. Transfer pump one; 13. Suction pipe one; 14. Outlet pipe one; 15. Outlet pipe two; 16. Transfer pump two; 17. Suction pipe two; 18. Recovery pump; 19. Return 20. Receiving pipe; 21. Discharge pump; 22. Outlet pipe three; 23. Negative pressure pump; 24. Sludge pump; 25. Sludge pipe; 26. Ejector; 27. Air inlet pipe; 28. Liquid distribution pipe; 29. ​​Liquid outlet spiral pipe; 30. Liquid outlet; 31. Dosing cartridge; 32. Liquid outlet side port; 33. Liquid extraction branch pipe; 34. Turbidity sensor; 35. Filter membrane; 36. Liquid level sensor; 37. Aeration pump; 38. Fixed frame; 39. Aeration pipe; 40. Aeration head; 41. Shaking frame; 42. Limiting rod; 43. Floating ball; 44. Vibrating inner plate; 45. Limiting frame; 46. Planar membrane; 47. Ejector pipe. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please see Figure 1 - Figure 2This invention provides a technical solution: a methyl ester wastewater treatment device for saccharin production, comprising a regulating cylinder 1, a coagulation cylinder 2, a wastewater inlet pump 6, a transfer pump 12, a transfer pump 2 16, a particle separator 4, a particle separator 2 7, a discharge pump 20, and a bioreactor 3. The input end of the wastewater inlet pump 6 is connected to the output end of the particle separator 4, and the output end of the particle separator 4 is connected to a wastewater inlet pipe 5. The particle separator 4 treats the particles in the wastewater, preventing particles from settling at the bottom and hindering subsequent wastewater treatment. The output end of the wastewater inlet pipe 5 extends into the regulating cylinder 1. A circulating stirring structure and an acid-base adjustment mechanism 9 are provided on the outside of the regulating cylinder 1. The input end of the transfer pump 12 is connected to a suction pipe 13. One end of the transfer pump 13, away from the transfer pump 12, extends into the regulating cylinder 1. The output end of the transfer pump 12 is connected to the input end of the particle separator 7. The output end of the particle separator 7 is connected to the outlet pipe 15. The particle separator 7 can clean the particles generated in the wastewater after pH adjustment. The output end of the outlet pipe 15 extends into the coagulation cylinder 2. The lower end of the coagulation cylinder 2 is conical. A flocculant treatment mechanism is set on the outside of the coagulation cylinder 2. The input end of the transfer pump 26 is connected to the liquid extraction pipe 17. The output end of the transfer pump 26 is connected to the outlet pipe 21. The output end of the outlet pipe 21 extends into the bioreactor 3. The bioreactor 3 is equipped with an MBR biofilm reactor. The output end of the discharge pump 20 is connected to the output end of the MBR biofilm reactor. The circulating stirring mechanism includes a circulating pump 10 and an ejector 25. The input end of the circulating pump 10 is connected to a circulating pipe 11. The end of the circulating pipe 11 away from the circulating pump 10 passes through the lower side wall of the regulating cylinder 1 and is connected to the regulating cylinder 1. The output end of the circulating pump 10 is connected to the input end of the ejector 25. The output end of the ejector 25 is connected to an ejector pipe 46. The ejector pipe 46 passes through the side wall of the regulating cylinder 1 and is connected to the regulating cylinder 1. The suction chamber side wall of the ejector 25 is connected to an air inlet pipe 26. The air inlet end of the air inlet pipe 26 extends upward to below the acid-base adjustment mechanism 9. Through the cooperation of the circulating pump 10 and the circulating pipe 11, part of the wastewater in the regulating cylinder 1 is extracted and then reintroduced into the regulating cylinder 1 through the ejector 25. When passing through the ejector 25, outside air enters through the air inlet pipe 26 and enters the regulating cylinder 1 with the ejector 25, thereby agitating the wastewater, promoting the uniform distribution of acid and alkaline agents, and thus achieving faster adjustment of the acidity and alkalinity of the wastewater. The jet pipe 46 extends tangentially along the inner wall of the regulating cylinder 1 into the regulating cylinder 1. A liquid outlet spiral pipe 28 is installed inside the regulating cylinder 1. The input end of the liquid outlet spiral pipe 28 is connected to a liquid distribution pipe 27. The end of the liquid distribution pipe 27 away from the liquid outlet spiral pipe 28 is connected to the jet pipe 46. Several liquid outlets 29 are opened on the side wall of the liquid outlet spiral pipe 28. The liquid outlets 29 are inclined downward. The distribution of the liquid outlets 29 ensures that the circulating wastewater can carry the pH adjustment agent and be evenly distributed in various positions of the regulating cylinder 1.

[0021] Example 2: Please see Figure 3 - Figure 6 As shown, based on Embodiment 1, the present invention provides a technical solution: an outlet pipe 14 is connected to an outlet pipe 2 15, a dosing cylinder 30 is fixedly connected to the inner side wall of the coagulation cylinder 2, a dosing port is provided at the upper end of the dosing cylinder 30, the output end of the outlet pipe 14 passes through the side wall of the coagulation cylinder 2 and the side wall of the dosing cylinder 30 in sequence, the outlet pipe 14 is connected to the dosing cylinder 30, and a liquid outlet 31 is opened on the side wall of the dosing cylinder 30; the dosing cylinder 30 is used to receive the dosing and storage of flocculant, and at the same time provides sufficient mixing space for wastewater and flocculant to ensure that the agent is fully dissolved and uniformly mixed with wastewater, and then the mixed liquid is sprayed into the coagulation cylinder 2 through the liquid outlet 31 to promote the efficient occurrence of flocculation reaction; Several suction branch pipes 32 are connected to the side wall of suction pipe 2 17. Solenoid valves are installed on the suction branch pipes 32. The input end of the suction branch pipe 32 passes through the side wall of the coagulation cylinder 2 and extends to the inside of the coagulation cylinder 2. A turbidity detection sensor 33 is installed below the outer wall of the suction branch pipe 32. The turbidity detection sensor 33 is located inside the coagulation cylinder 2. The arrangement of several suction branch pipes 32 ensures that wastewater at different locations in the coagulation cylinder 2 can be accurately extracted. With the help of the solenoid valves, regional extraction control is realized to ensure that only qualified wastewater enters the subsequent units. The turbidity detection sensor 33 can detect the turbidity of wastewater at different locations in the coagulation cylinder 2 in real time and transmit the detection signal to the control system, which then controls the opening and closing of the solenoid valve on the corresponding suction branch pipe 32. This enables the extraction of qualified wastewater. Wastewater with higher turbidity contains more flocculents. This type of wastewater with higher turbidity is introduced into the flocculant treatment tank 8 for further treatment. The flocculant treatment mechanism includes a flocculant treatment tank 8, a sludge discharge pump 23, a negative pressure pump 22, and a recovery pump 18. The input end of the sludge discharge pump 23 is connected to a sludge discharge pipe 24. The output end of the sludge discharge pipe 24 passes through the lower side wall of the coagulation cylinder 2 and is connected to the coagulation cylinder 2. The output end of the sludge discharge pump 23 passes through the upper side wall of the flocculant treatment tank 8 and is connected to the flocculant treatment tank 8. A filter membrane 34 is installed inside the flocculant treatment tank 8. The negative pressure output end of the negative pressure pump 22 is connected to the flocculant treatment tank 8. The connection point between the negative pressure output end of the negative pressure pump 22 and the flocculant treatment tank 8 is located below the filter membrane 34. A liquid level detection sensor 35 is installed below the connection point between the negative pressure output end of the negative pressure pump 22 and the flocculant treatment tank 8. The recovery pump 18... The inlet penetrates the side wall of the flocculant treatment tank 8 and is connected to the flocculant treatment tank 8. The output end of the recovery pump 18 is connected to the recovery pipe 19. The end of the recovery pipe 19 away from the recovery pump 18 extends to the inside of the coagulation cylinder 2. For the flocculants at the bottom of the coagulation cylinder 2, the sludge pump 23 sends them to the top of the filter membrane 34 in the flocculant treatment tank 8 through the sludge discharge pipe 24. The negative pressure pump 22 starts and provides negative pressure to the bottom of the filter membrane 34, causing the wastewater entrained in the flocculants to flow through the filter membrane 34 to the bottom. When the liquid level detection sensor 35 detects that the wastewater below the filter membrane 34 has reached the maximum amount, the recovery pump 18 pumps the wastewater back to the coagulation cylinder 2 through the recovery pipe 19 for secondary treatment, thereby realizing the recycling of water resources.

[0022] Example 3: Please see Figure 7 - Figure 10 As shown, based on Embodiment 1, this invention provides a technical solution: the MBR biofilm reactor, as the core unit for advanced wastewater treatment, is specifically used to degrade recalcitrant organic matter, COD, BOD, and other pollutants in wastewater. It contains an MBR biofilm reactor, enabling efficient solid-liquid separation and ensuring wastewater meets discharge standards. The MBR biofilm reactor includes a fixed frame 37 housed within a bioreactor 3. Inside the fixed frame 37, a swaying frame 40 and several sets of planar membranes 45 are arranged. Several... Several vibrating inner plates 43 are staggered with several sets of planar membranes 45. Limiting frames 44 are fixedly connected to the upper ends of both sides of the fixed frame 37. L-shaped limiting rods 41 are fixedly connected to both sides of the shaking frame 40. The upper ends of the two limiting rods 41 pass through the left and right limiting frames 44 respectively and are fixedly connected to floating balls 42. The MBR biofilm reactor is set inside the bioreactor 3. Its core function is to degrade recalcitrant pollutants in wastewater and achieve solid-liquid separation. By retaining the microbial community and increasing the biological concentration, the degradation efficiency is further improved. After deep treatment, the wastewater that meets the discharge standards is finally discharged by the discharge pump 20. An aeration pump 36 is installed on the outside of the bioreactor 3, and an aeration pipe 38 is installed on the inside of the bioreactor 3. Several aeration heads 39 are connected to the side wall of the aeration pipe 38 through several flexible connecting pipes. The output end of the aeration pump 36 is connected to the aeration pipe 38. Inside the bioreactor 3, when the aeration pump 36 is started, it aerates the wastewater through the aeration pipe 38 and the flexible connecting aeration heads 39. The flexible connecting pipes cause the aeration heads 39 to shake irregularly, which improves the agitation effect of the wastewater and ensures that the wastewater reacts fully with the biological community in the MBR biofilm reactor. Meanwhile, inside the bioreactor 3, the aeration pump 36 is started, aerating the wastewater through the aeration pipe 38 and the flexible aeration head 39. The flexible connecting pipe causes the aeration head 39 to shake irregularly, improving the agitation effect of the wastewater and ensuring that the wastewater reacts fully with the biological community in the MBR biofilm reactor. The acid-base adjustment mechanism 9 includes an alkaline storage tank 901, an acidic storage tank 902, an alkaline supply pump 903, and an acidic supply pump 904. The output end of the alkaline supply pump 903 is connected to the alkaline storage tank 901, and the output end of the acidic supply pump 904 is connected to the acidic storage tank 902. Both the output ends of the alkaline supply pump 903 and the acidic supply pump 904 are connected to supply pipes 905. The output ends of both supply pipes 905 are connected to air inlet pipes 26. A pressure balance pipe 906 is connected to the side wall of the supply pipe 905. One-way air inlet valves are installed on both pressure balance pipes 906 and the air inlet pipe 26. The one-way air inlet valve is located above the connection between the liquid supply pipe 905 and the air inlet pipe 26. When adjusting the pH, the acid supply pump 904 and the alkaline supply pump 903 control the supply of acidic and alkaline agents, respectively. The agent is introduced into the ejector 25 through the liquid supply pipe 905 and the air inlet pipe 26. Both the acid supply pump 904 and the alkaline supply pump 903 are metering pumps, which makes it easier to control the amount of agent used. At the same time, the pressure balance pipe 906 ensures that after the acid supply pump 904 and the alkaline supply pump 903 are closed, the negative pressure in the suction chamber of the ejector 25 ensures that the liquid in the liquid supply pipe 905 completely enters the regulating cylinder 1.

[0023] Working principle: During operation, the wastewater inlet pump 6 sends wastewater into the particle separator 4 to complete the initial interception treatment of impurities in the wastewater. The treated wastewater enters the regulating cylinder 1 through the wastewater inlet pipe 5. The acid-alkalinity regulating mechanism 9 is activated. Both the acid supply pump 904 and the alkalinity supply pump 903 are quantitative pumps. During use, the acid supply pump 904 and the alkalinity supply pump 903 control the supply of acidic and alkaline agents, respectively. The agents are introduced into the ejector 25 through the liquid supply pipe 905 and the air inlet pipe 26. At the same time, the circulation pump 10 draws part of the wastewater in the regulating cylinder 1 through the circulation pipe 11 and sends it to the ejector 25 to mix with the agents. After mixing, the mixture is injected into the regulating cylinder 1 along the inner wall tangentially through the ejector pipe 46. With the help of the liquid outlet spiral pipe 28 and the inclined liquid outlet 29, the agents are evenly dispersed in the wastewater. At the same time, the wastewater is rotated and stirred to achieve precise and uniform adjustment of the pH value of the wastewater.

[0024] After the wastewater is properly regulated, transfer pump 12 draws wastewater from regulating cylinder 1 through suction pipe 13 and sends it to particle separator 7 for secondary impurity separation to further remove residual impurities. The treated wastewater enters coagulation cylinder 2 through outlet pipe 2 15, and flocculant is added to dosing cylinder 30. The wastewater then enters dosing cylinder 30 through outlet pipe 1 14 to mix thoroughly with the flocculant, and is then sprayed out from outlet side port 31 into coagulation cylinder 2 to promote flocculation reaction and produce flocs. Subsequently, turbidity sensor 33 detects the turbidity of wastewater at different locations in coagulation cylinder 2. When the turbidity of wastewater at a certain location meets the subsequent treatment standards, the solenoid valve on the corresponding suction branch pipe 32 opens, and transfer pump 2 16 sends this portion of the upper wastewater into biological reactor 3 through suction branch pipe 32, suction pipe 2 17, and outlet pipe 3 21. Next, the aeration pump 36 is started, and aeration is introduced into the wastewater through the aeration pipe 38 and the flexible aeration head 39. The flexible connecting pipe causes the aeration head 39 to shake irregularly, which improves the agitation effect of the wastewater and ensures that the wastewater reacts fully with the biological community in the MBR biofilm reactor. At the same time, the floating ball 42 moves with the flow of wastewater, driving the shaking frame 40 and the vibrating inner plate 43 to move. The vibrating inner plate 43 collides with the flat membrane 45, shaking off the sludge attached to the surface of the flat membrane 45 and preventing the membrane module from clogging. After being filtered by the MBR biofilm reactor, the wastewater is discharged by the discharge pump 20, completing the deep treatment. For the flocs at the bottom of the coagulation drum 2, the sludge pump 23 sends them through the sludge discharge pipe 24 to the top of the filter membrane 34 in the floc treatment tank 8; the negative pressure pump 22 starts and provides negative pressure to the bottom of the filter membrane 34, causing the wastewater entrained in the flocs to flow through the filter membrane 34 to the bottom. When the liquid level detection sensor 35 detects that the wastewater below the filter membrane 34 has reached the maximum amount, the recovery pump 18 pumps the wastewater back to the coagulation drum 2 through the recovery pipe 19 for secondary treatment, so as to realize the recycling of water resources.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for treating methyl ester wastewater from saccharin production, characterized in that: The system includes a regulating cylinder (1), a coagulation cylinder (2), a wastewater inlet pump (6), a transfer pump one (12), a transfer pump two (16), a particle separator one (4), a particle separator two (7), a discharge pump (20), and a bioreactor (3). The input end of the wastewater inlet pump (6) is connected to the output end of the particle separator one (4). The output end of the particle separator one (4) is connected to a wastewater inlet pipe (5). The output end of the wastewater inlet pipe (5) extends into the regulating cylinder (1). A circulating stirring structure and an acid-base adjustment mechanism (9) are provided on the outside of the regulating cylinder (1). The input end of the transfer pump one (12) is connected to a liquid extraction pipe one (13). The end of the liquid extraction pipe one (13) away from the transfer pump one (12) extends into the regulating cylinder. (1) Inside, the output end of the transfer pump one (12) is connected to the input end of the particle separator two (7). The output end of the particle separator two (7) is connected to the outlet pipe two (15). The output end of the outlet pipe two (15) extends into the coagulation cylinder (2). The lower end of the coagulation cylinder (2) is conical. A flocculant treatment mechanism is provided on the outside of the coagulation cylinder (2). The input end of the transfer pump two (16) is connected to the liquid extraction pipe two (17). The output end of the transfer pump two (16) is connected to the outlet pipe three (21). The output end of the outlet pipe three (21) extends into the bioreactor (3). An MBR biofilm reactor is provided in the bioreactor (3). The output end of the discharge pump (20) is connected to the output end of the MBR biofilm reactor.

2. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The circulating stirring mechanism includes a circulating pump (10) and an ejector (25). The input end of the circulating pump (10) is connected to a circulating pipe (11). The end of the circulating pipe (11) away from the circulating pump (10) passes through the lower side wall of the regulating cylinder (1) and is connected to the regulating cylinder (1). The output end of the circulating pump (10) is connected to the input end of the ejector (25). The output end of the ejector (25) is connected to an ejector pipe (46). The ejector pipe (46) passes through the side wall of the regulating cylinder (1) and is connected to the regulating cylinder (1). The side wall of the suction chamber of the ejector (25) is connected to an air inlet pipe (26). The air inlet end of the air inlet pipe (26) extends upward to below the acid-base adjustment mechanism (9).

3. The methyl ester wastewater treatment device for saccharin production according to claim 2, characterized in that: The jet tube (46) extends into the regulating cylinder (1) along the tangential direction of the inner side wall. The regulating cylinder (1) is provided with a liquid outlet spiral tube (28). The input end of the liquid outlet spiral tube (28) is connected to a liquid separator (27). The end of the liquid separator (27) away from the liquid outlet spiral tube (28) is connected to the jet tube (46). Several liquid outlets (29) are opened on the side wall of the liquid outlet spiral tube (28). The liquid outlets (29) are inclined downward.

4. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The acid-base adjustment mechanism (9) includes an alkaline storage tank (901), an acidic storage tank (902), an alkaline supply pump (903), and an acidic supply pump (904). The output end of the alkaline supply pump (903) is connected to the alkaline storage tank (901), and the output end of the acidic supply pump (904) is connected to the acidic storage tank (902). The output ends of the alkaline supply pump (903) and the acidic supply pump (904) are both connected to a supply pipe (905). The output ends of the two supply pipes (905) are both connected to an air inlet pipe (26). A pressure balance pipe (906) is connected to the side wall of the supply pipe (905). A one-way air inlet valve is provided on both pressure balance pipes (906) and the air inlet pipe (26). The one-way air inlet valve on the air inlet pipe (26) is located above the connection between the supply pipe (905) and the air inlet pipe (26).

5. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The second outlet pipe (15) is connected to the first outlet pipe (14). The inner wall of the coagulation cylinder (2) is fixedly connected to the dosing cylinder (30). The upper end of the dosing cylinder (30) is provided with a dosing port. The output end of the first outlet pipe (14) passes through the side wall of the coagulation cylinder (2) and the side wall of the dosing cylinder (30) in sequence. The first outlet pipe (14) is connected to the dosing cylinder (30). The side wall of the dosing cylinder (30) is provided with a liquid outlet (31).

6. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The side wall of the second (17) pumping pipe is connected to several pumping branch pipes (32). The pumping branch pipes (32) are equipped with solenoid valves. The input end of the pumping branch pipes (32) passes through the side wall of the coagulation cylinder (2) and extends to the inside of the coagulation cylinder (2). A turbidity detection sensor (33) is installed below the outer side wall of the pumping branch pipes (32). The turbidity detection sensor (33) is located inside the coagulation cylinder (2).

7. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The flocculant treatment mechanism includes a flocculant treatment tank (8), a sludge discharge pump (23), a negative pressure pump (22), and a recovery pump (18). The input end of the sludge discharge pump (23) is connected to a sludge discharge pipe (24), and the output end of the sludge discharge pipe (24) passes through the lower side wall of the coagulation cylinder (2) and is connected to the coagulation cylinder (2). The output end of the sludge discharge pump (23) passes through the upper side wall of the flocculant treatment tank (8) and is connected to the flocculant treatment tank (8). A filter membrane (34) is provided inside the flocculant treatment tank (8). The negative pressure output end of the negative pressure pump (22) is connected to the flocculant treatment tank. The negative pressure output end of the negative pressure pump (22) is connected to the flocculant treatment box (8) and the connection point is located below the filter membrane (34). A liquid level detection sensor (35) is provided below the connection point of the negative pressure output end of the negative pressure pump (22) and the flocculant treatment box (8). The input end of the recovery pump (18) penetrates the side wall of the flocculant treatment box (8) and is connected to the flocculant treatment box (8). The output end of the recovery pump (18) is connected to the recovery pipe (19). The end of the recovery pipe (19) away from the recovery pump (18) extends to the inside of the coagulation cylinder (2).

8. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: The MBR biofilm reactor includes a fixed frame (37) set inside the bioreactor (3). Inside the fixed frame (37) are a shaking frame (40) and several sets of planar membranes (45). Several vibrating inner plates (43) are fixedly connected to the inner wall of the shaking frame (40). The several vibrating inner plates (43) and several sets of planar membranes (45) are staggered. Limiting frames (44) are fixedly connected to the upper ends of the left and right side walls of the fixed frame (37). L-shaped limiting rods (41) are fixedly connected to the left and right side walls of the shaking frame (40). The upper ends of the two limiting rods (41) pass through the left and right limiting frames (44) respectively and are fixedly connected to floating balls (42).

9. The methyl ester wastewater treatment device for saccharin production according to claim 1, characterized in that: An aeration pump (36) is provided on the outside of the bioreactor (3), and an aeration pipe (38) is provided on the inside of the bioreactor (3). Several aeration heads (39) are connected to the side wall of the aeration pipe (38) through several flexible connecting pipes. The output end of the aeration pump (36) is connected to the aeration pipe (38).

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