Saponification wastewater circulation treatment process based on medium-chain and long-chain triglyceride production

Abstract

The invention relates to the technical field of saponification wastewater treatment, and particularly discloses a saponification wastewater circulation treatment process based on medium-chain and long-chain triglyceride production, which comprises the following steps: S1, pretreatment; s2, coagulating sedimentation; s3, advanced treatment of activated sludge; s4, carrying out deep treatment on the membrane; in the step of advanced treatment of the activated sludge in the step S3, data of SV in a mixed solution also needs to be detected, so that a sludge index can be conveniently calculated, and the flocculability and settleability of the sludge can be judged; a water conveying pipe and a water discharging pipe are arranged on the wall of the aeration tank, a mounting frame is fixedly connected to the wall of the aeration tank, a measuring cylinder is arranged on the mounting frame in a sliding manner, a lifting assembly for lifting the measuring cylinder is arranged on the mounting frame, and a stratified sampling assembly for sampling mixed liquid at different depths by the measuring cylinder is further arranged on the mounting frame; and a monitor over against the measuring cylinder is also fixedly connected to the mounting frame above the mixed liquid. The method has the effects of simplifying the manual operation process in the sampling process and reducing errors during detection.

Description

Technical Field

[0001] The present application relates to the technical field of saponification wastewater treatment, and in particular to a saponification wastewater recycling treatment process for the production of medium- and long-chain triglycerides. Background Art

[0002] Medium-chain triglycerides (MLCT) are widely used in food, nutritional supplements and medicine. The main structural feature of MLCT is that medium-chain fatty acids and long-chain fatty acids are combined on a glycerol skeleton. It combines the advantages of medium-chain triglycerides (MCT) and long-chain triglycerides (LCT), and has the functions of rapid absorption and providing lasting energy.

[0003] MLCT relies on artificial chemical or enzymatic synthesis. The chemical method is the current mainstream production process, using strong acids, solid acids and bases, alkali metals, etc. as catalysts, with rapid reactions and mature processes, but the process is energy-intensive and produces a large amount of wastewater; the enzymatic synthesis process has the advantages of mild reaction conditions, high product purity, few by-products, and green safety, but there are industrial problems such as immature processes, easy enzyme inactivation, and high production costs. In the chemical synthesis process, especially when alkali metals are used as catalysts, saponification reactions are prone to occur and saponification wastewater is produced.

[0004] When treating saponified wastewater, it is necessary to first react the saponified wastewater with acidic substances to make the pH value of the saponified wastewater close to neutral, and then discharge the neutralized saponified wastewater into the aeration tank to fully mix the saponified wastewater with the activated sludge, and use the metabolism of microorganisms to decompose the organic matter in the wastewater into harmless carbon dioxide, water and harmless substances, and then discharge the biochemically treated water after passing the test or continue to purify it through deep treatment processes such as adsorption and membrane separation. During the operation of the aeration tank, it is necessary to measure parameters such as DO (dissolved oxygen), MLSS (sludge concentration), SV (sludge settling ratio), and SVI (sludge index). DO is usually measured by a dissolved oxygen meter (or probe), MLSS is usually measured by an MLSS detector or a suspended solids concentration meter, SV is often measured by measuring the solution in the aeration tank through a measuring cylinder and observing and recording the sludge settling process in the solution, and SVI is calculated by SV and MLSS.

[0005] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when measuring SV, the staff must wear protective equipment (such as safety helmets, non-slip shoes, protective glasses, protective gloves, etc.) before the aeration reaction ends, and then fasten their safety belts before reaching the edge of the aeration tank. After confirming that the environment is safe, use a sampling bottle of not less than 1L to obtain the mixed liquid from the aeration tank, and then bring the mixed liquid back to the experimental area, and transfer the mixed liquid in the sampling bottle to a 1L measuring cylinder and let it stand for 30 minutes. Observe and record the sludge sedimentation process and the volume after sedimentation, and then complete the sampling and measurement. The sampling process is relatively complicated. At the same time, when manually sampling, the surface mixed liquid is mainly taken, and it is difficult to obtain the mixed liquid in the middle and upper layers. The surface mixed liquid has relatively less sludge, which leads to large errors in detection. Summary of the invention

[0006] In order to improve the problems of complicated sampling process and large sample error, the present application provides a saponification wastewater recycling treatment process for the production of medium and long-chain triglycerides.

[0007] The present application provides a saponification wastewater recycling treatment process for medium and long chain triglyceride production using the following technical solution: A saponification wastewater recycling treatment process for medium and long chain triglyceride production comprises the following steps: S1. Pretreatment: discharge the saponification wastewater into a sedimentation tank for sedimentation, remove the suspended solids and large particles in the saponification wastewater, add a demulsifier to the saponification wastewater to destroy the stability of the emulsion in the saponification wastewater, condense and separate the oil droplets, and then use an acid-base regulator to adjust the pH value of the wastewater to an appropriate range; S2. Coagulation and sedimentation: Add coagulants and flocculants to the saponified wastewater to make the fine particles and colloidal substances in the wastewater coagulate into larger particles and then settle down; S3, activated sludge deep treatment: the saponified wastewater treated by S1 and S2 is sent to the aeration tank and fully mixed with the activated sludge in the aeration tank, and the organic matter in the wastewater is decomposed into harmless carbon dioxide, water and other harmless substances through the metabolism of microorganisms; S4. Membrane deep treatment: Use ultrafiltration, reverse osmosis and other membrane separation technologies to further remove tiny particles, soluble organic matter and salt in the water, so that the discharged water quality reaches higher standards and the treated water can be directly reused in the production process of medium and long-chain triglycerides.

[0008] Optionally, a water pipe and a drainage pipe are provided on the wall of the aeration tank, a mounting frame is fixedly connected to the wall of the aeration tank, a measuring cylinder with a capacity of 1L and a transparent peripheral wall is slidably provided on the mounting frame in the vertical direction, a lifting assembly for lifting the measuring cylinder is provided on the mounting frame, a stratified sampling assembly for sampling mixed liquids of different depths with the measuring cylinder is also provided on the mounting frame, and a monitor facing the measuring cylinder is also provided on the mounting frame above the mixed liquid; The stratified sampling assembly comprises an upper mounting plate arranged above the measuring cylinder, a fixing rod fixedly connected to one end of the upper mounting plate close to the measuring cylinder, a lower mounting plate fixedly connected to one end of the fixing rod away from the upper mounting plate, and a pneumatic push rod fixedly connected to one end of the upper mounting plate away from the measuring cylinder, the distance between the upper mounting plate and the lower mounting plate is greater than the height of the measuring cylinder, the open end of the measuring cylinder is located at one end of the measuring cylinder close to the upper mounting plate, there are multiple pneumatic push rods and the output end of the pneumatic push rod passes through the upper mounting plate and is fixedly connected to the measuring cylinder, a waterproof pad is glued to the bottom end of the upper mounting plate, and when the pneumatic push rod is at the minimum stroke, the measuring cylinder is tightly pressed against the waterproof pad; A partition box is provided inside the measuring cylinder for sliding in the vertical direction, a waterproof ring is fixedly connected to the peripheral wall of the partition box and is tightly pressed against the inner wall of the measuring cylinder, a passive annular magnet is fixedly connected inside the partition box, the inner ring of the passive annular magnet has the same polarity and the outer ring has the same polarity, an active annular magnet is provided outside the measuring cylinder, the inner ring of the active annular magnet has the same polarity and the outer ring has the same polarity, a breathable component for controlling the air pressure between the bottom wall of the measuring cylinder and the partition box is provided on the lower mounting plate, and an adjusting component for adjusting the position of the active annular magnet is provided on the fixing rod.

[0009] By adopting the above technical solution, in the aeration tank, since the SV data in the mixed liquid needs to be detected, it is only necessary to first lower the measuring cylinder to the specified position through the lifting component, and then control the pneumatic push rod to extend to separate the measuring cylinder from the waterproof pad, and use the breathable component to release the air between the partition box and the bottom wall of the measuring cylinder during the downward movement of the partition box, so that the partition box can move down smoothly, and then the adjustment component adjusts the active annular magnet to move downward, so that the passive annular magnet also moves downward, that is, the partition box moves downward, at this time, the mixed liquid in the aeration tank enters the measuring cylinder through the gap between the waterproof pad and the measuring cylinder, and the distance between the partition box and the opening of the measuring cylinder is used to accurately control the amount of liquid to be sampled at the current depth. After collecting a certain volume, the pneumatic push rod contracts to make the measuring cylinder close to the waterproof pad again. At this time, the waterproof pad and the measuring cylinder are close, and the mixed liquid can no longer enter The measuring cylinder is then controlled by the lifting assembly to continue to descend to other depths for sampling, and the mixed liquids of different sampled depths are also directly mixed without other mixing steps, which effectively reduces sample errors, and the sampling process is relatively simple, does not require a large amount of manual operation, and has high manual safety. After the sampling is completed, the lifting assembly raises the measuring cylinder to above the liquid surface and allows it to stand still. The monitor uses image processing to timely analyze the conditions in the measuring cylinder in real time, and the analysis results are relatively accurate. When the mixed liquid in the measuring cylinder needs to be discharged after the detection is completed, it is only necessary to separate the measuring cylinder from the waterproof pad first, and then adjust the active annular magnet by the adjustment assembly to move up, that is, the partition box moves up. In this process, the partition box moves up to discharge the precipitated sludge, solution, etc. in the measuring cylinder, and scrape off the sludge adhered to the inner wall of the measuring cylinder. The cleaning process is simple, which is convenient for the next sampling and detection operations.

[0010] Optionally, the breathable component includes a sealing rod fixedly connected to the upper end of the lower mounting plate and a sealing block fixedly connected to the end of the sealing rod away from the lower mounting plate, the sealing block is in the shape of an inverted cone, the inner bottom wall of the measuring cylinder is provided with a sealing groove adapted to the sealing block, the surface of the sealing block is made of elastic waterproof material, and when the measuring cylinder is pressed against the waterproof pad, the sealing block is pressed against the groove wall of the sealing groove, and when the measuring cylinder is separated from the waterproof pad, the sealing block is separated from the groove wall of the sealing groove.

[0011] By adopting the above technical solution, when the measuring cylinder moves to gradually separate from the waterproof pad, the sealing rod and the sealing block do not move, but the movement of the measuring cylinder causes the groove wall of the sealing groove on the measuring cylinder to move downward, thereby separating the sealing block from the groove wall of the sealing groove. At this time, since the gap between the sealing groove and the sealing rod and the sealing block is relatively small, and the air pressure between the inner bottom wall of the measuring cylinder and the partition box is relatively large, the mixed liquid cannot enter the measuring cylinder from the sealing groove. However, when the partition box descends, the partition box pushes the gas in the space below the partition box, so that the gas between the partition box and the inner bottom wall of the measuring cylinder is gradually discharged from the sealing groove, that is, the partition box is When the box descends, liquid enters from the top of the separation box and exhausts from the bottom; after sampling of one liquid level is completed, the measuring cylinder moves to be tightly pressed against the waterproof pad again, and the wall of the sealing groove also moves to be tightly pressed against the sealing block to prevent the mixed liquid from entering the measuring cylinder from the sealing groove due to unexpected circumstances; when the measuring cylinder is above the liquid level and the test is completed and needs to be drained, the measuring cylinder moves to be separated from the waterproof pad, at which time the wall of the sealing groove is separated from the sealing block, and then the separation box moves up to drain water, and the outside gas enters the measuring cylinder from the sealing groove, so that the bottom wall of the measuring cylinder and the separation box are always at standard atmospheric pressure, thereby allowing the separation box to move smoothly.

[0012] Optionally, the adjustment assembly includes an ear plate fixedly connected to the peripheral wall of the measuring cylinder near one end of the lower mounting plate, a first motor fixedly connected to the ear plate near one end of the lower mounting plate, and a screw threaded through the active annular magnet, and the adjustment assembly also includes a bellows arranged between the active annular magnet and the ear plate, and between the ear plate and the lower mounting plate, and the screw and the first motor are both located in the bellows.

[0013] By adopting the above technical solution, when the partition box needs to be moved up, the first motor drives the lead screw to rotate, the lead screw drives the active annular magnet to move up, the active annular magnet drives the passive annular magnet to move up, and then the partition box moves up; when it is necessary to split and move down, it is only necessary to adjust the first motor in the opposite direction of the aforementioned output direction. During the movement of the active annular magnet, the positions of the active annular magnet, the first motor, and the active annular magnet on the lead screw are all changing, and the bellows ensures that the lead screw and the first motor always maintain liquid isolation when the active annular magnet moves, thereby preventing liquid from entering the first motor and impurities such as sludge from adhering to the threads of the lead screw.

[0014] Optionally, a light shield for covering the measuring cylinder is fixedly connected to the mounting frame above the liquid surface, the monitor is located inside the light shield, a cold light lamp emitting soft light is provided on the inner wall of the light shield, a plurality of photoelectric sensors are arranged in sequence along the vertical direction on the inner wall of the light shield on the opposite side of the cold light lamp, and the inner wall of the light shield is a light-absorbing carbon black color.

[0015] By adopting the above technical solution, after the measuring cylinder is sampled, the lifting assembly raises the measuring cylinder to the light shield. Since there is less mixed liquid in the measuring cylinder and the sunlight is strong in summer, the light shield effectively reduces the variable that affects the sludge activity due to the change in temperature of the mixed liquid caused by sunlight. Then the cold light lamp is turned on. The light shield also reduces the interference of external light sources such as sunlight on the light source of the cold light lamp, so that the light source emitted by the cold light lamp is irradiated on the measuring cylinder and received by the photoelectric sensor. The carbon black inside the light shield can also absorb the refracted light irradiated on the measuring cylinder by the cold light lamp to avoid the refracted light from affecting the photoelectric sensor. Interference. When there is more suspended sludge in the mixed liquid, less light passes through the measuring cylinder, and the photoelectric sensor receives less light at this time. When most of the sludge in the mixed liquid has settled, the light transmittance of the measuring cylinder is high, and the photoelectric sensor receives more light at this time. That is, during the sludge settling process, each photoelectric sensor judges the sludge settling situation at the corresponding position in real time according to the change of light transmittance. Then the data of each photoelectric sensor can be statistically analyzed by the background computer to obtain detailed data of the sludge settling process and the final result in the measuring cylinder, and cooperate with the results of the monitor to obtain more accurate data.

[0016] Optionally, an electric push rod is fixedly connected to the inner top wall of the light shielding hood, and the output end of the electric push rod is fixedly connected to the monitor. A rolling switch is provided at the end of the monitor away from the measuring cylinder, and the light shield is tightly abutted against the rolling switch. A convex lens is rotatably connected to the lower part of the monitor close to one end of the measuring cylinder. A second motor is fixedly connected to the monitor, and the output end of the second motor is fixedly connected to the edge of the convex lens. When the monitor is facing the middle of the measuring cylinder, the second motor drives the convex lens to flip to the bottom of the monitor, and when the monitor is facing below the middle position of the measuring cylinder, the second motor drives the convex lens to flip to the front of the monitor.

[0017] When the sludge in the measuring cylinder is in the sedimentation process, the monitor is facing the middle of the measuring cylinder to facilitate real-time observation of the entire measuring cylinder, and then more accurately monitor the sludge sedimentation process; when the sludge in the measuring cylinder has been settled, the photoelectric sensor determines the thickness of the activated sludge sedimentation, and the electric push rod pushes the monitor downward until the center position of the monitor's lens moves to the same height as the upper surface of the deposited sludge mass. During this process, the rolling switch is rubbed by the light shield and sends a signal. At this time, the second motor drives the convex lens to flip in front of the monitor's lens to magnify the scale on the measuring cylinder corresponding to the sludge depth in the measuring cylinder observed by the monitor. The monitor observes the sludge depth horizontally in a purely visual manner, which further reduces the detection error and avoids the error caused by the refraction of light when the monitor is not at the same height as the sludge and the monitor is tilted for observation.

[0018] Optionally, a nozzle is fixedly connected through the center of the upper mounting plate, a water supply pipe is provided through the top of the light shield, the part of the water supply pipe located inside the light shield is a hard pipe, and the input end of the nozzle is flared. When the upper mounting plate moves to the highest point, the nozzle is plugged into the water supply pipe.

[0019] By adopting the above technical solution, when the lifting assembly makes the measuring cylinder rise to the light shield, the water supply pipe is connected with the nozzle. When the measuring cylinder is drained and needs to be cleaned, the upper surface of the partition box is flush with the mouth of the measuring cylinder. Then the water supply pipe is turned on to supply water, so that the nozzle sprays water to the upper surface of the partition box. The sprayed water will wash away the sludge adhering to the partition box. After the sludge on the partition box is cleaned, the water supply pipe stops supplying water, and the measuring cylinder is moved again to be tightly against the waterproof pad. At this time, the next sampling and testing operation can be carried out.

[0020] Optionally, a motor is fixedly connected to the top of the light shield, a horizontal connecting rod is fixedly connected to the output end of the motor, and a stirring rod inserted into the liquid surface is fixedly connected to one end of the connecting rod away from the motor.

[0021] By adopting the above technical scheme, since the sampling operation needs to be carried out after the aeration operation in the aeration tank is completed, the sludge rolls in the mixed liquid due to the influence of the airflow during the aeration operation, but the sludge in the mixed liquid will gradually settle after the aeration is completed. The farther the sampling time is from the end time of aeration, the more sludge settles, and the greater the error of the final measurement result. Before sampling, the motor is turned on to make the output shaft of the motor rotate back and forth, and the motor drives the connecting rod to rotate, thereby causing the stirring rod to move accordingly to stir the mixed liquid. The motor is turned off at the beginning of the sampling operation, and then the sampling process is quickly completed, thereby effectively reducing the error of the final detection result.

[0022] Optionally, the lifting assembly includes a driving wheel rotatably connected to the mounting frame, a driven wheel, a synchronous belt fixed to the lower mounting plate, and a sliding rod fixed to the bottom wall of the aeration tank, the synchronous belt meshingly connected to the driving wheel and the driven wheel, and the sliding rod is passed through the lower mounting plate.

[0023] By adopting the above technical solution, when the measuring cylinder needs to enter below the liquid surface for sampling or to exit the liquid surface from the mixed liquid, the driving wheel rotates to drive the synchronous belt to move, and the synchronous belt drives the lower mounting plate to move. During this process, the sliding rod makes the lower mounting plate more stable, the structure is simple, and the degree of resistance to harsh environments such as sludge is higher.

[0024] Optionally, the drain pipe is a hose, a float is fixedly connected to the water inlet end of the drain pipe, the water inlet of the drain pipe is immersed in the liquid surface, a limit rod is fixedly connected in the aeration tank along the vertical direction, and the float is slidably connected to the limit rod.

[0025] By adopting the above technical scheme, when the aeration tank needs to be drained after the reaction is completed, the water inlet of the drain pipe is located at a higher liquid level of the mixed liquid due to the buoyancy of the floating block. When the drain pipe is pumping water, the drain pipe gives priority to extracting the supernatant after precipitation. When the water inlet of the drain pipe is located at a lower position, the extraction of the remaining liquid is stopped to avoid large suction force disturbing the sludge and causing a large amount of sludge to be extracted. After stopping the extraction, the saponified wastewater that has not been deeply treated with activated sludge is input into the aeration tank through the water pipe to start a new round of saponified wastewater treatment.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The measuring cylinder is first lowered to the middle and high level position through the lifting assembly, and then the pneumatic push rod is controlled to extend to separate the measuring cylinder from the waterproof pad. At this time, the mixed liquid in the aeration tank enters the measuring cylinder through the gap between the waterproof pad and the measuring cylinder. After a certain volume is collected, the pneumatic push rod is contracted to make the measuring cylinder close to the waterproof pad again. At this time, the waterproof pad and the measuring cylinder are close, and the mixed liquid can no longer enter the measuring cylinder. Then the measuring cylinder is controlled by the lifting assembly to continue to descend to other depths for sampling, and the mixed liquids of different depths sampled are also directly mixed without other mixing steps, and the sample error is effectively reduced. The sampling process is relatively simple, does not require a lot of manual operation, and has high manual safety. After the sampling is completed, the lifting assembly raises the measuring cylinder to above the liquid surface and allows it to stand still. The monitor uses image processing to timely analyze the situation in the measuring cylinder in real time, and the result analysis is relatively accurate; 2. When the measuring cylinder drops to the specified position and the measuring cylinder is separated from the waterproof pad, the adjustment component adjusts the active annular magnet to move downward, so that the passive annular magnet also moves downward, that is, the partition box moves downward, and the amount of liquid to be sampled at the current depth is accurately controlled by the distance between the partition box and the opening of the measuring cylinder. When discharging liquid, the partition box scrapes off the sludge adhering to the inner wall of the measuring cylinder during the upward movement of the partition box. When the partition box moves to be flush with the opening of the measuring cylinder, the nozzle flushes out the sludge remaining on the partition box for direct use next time, without manual on-site operation; 3. When there is more suspended sludge in the mixed liquid, the amount of light passing through the measuring cylinder is less, and the photoelectric sensor receives less light at this time. When most of the sludge in the mixed liquid has settled, the light transmittance of the supernatant in the measuring cylinder is higher, and the photoelectric sensor corresponding to the supernatant receives more light. That is, during the sludge settling process, each photoelectric sensor determines the sludge settling situation at the corresponding position in real time according to the change of light transmittance. Then, the data of each photoelectric sensor can be statistically analyzed by the background computer to obtain detailed data on the sludge settling process and final result in the measuring cylinder. When the sludge in the measuring cylinder has settled, The photoelectric sensor determines the thickness of the activated sludge sedimentation, and the electric push rod pushes the monitor downward until the center position of the monitor lens moves to the same height as the upper surface of the deposited sludge mass. During this process, the rolling switch is rubbed by the light shield and sends a signal. At this time, the second motor drives the convex lens to flip in front of the monitor lens to magnify the scale on the measuring cylinder corresponding to the sludge depth in the measuring cylinder observed by the monitor. The monitor observes the sludge depth horizontally in a purely visual manner, which further reduces the detection error and avoids the error caused by the refraction of light when the monitor is not at the same height as the sludge and the monitor is tilted for observation; 4. In the process of the measuring cylinder moving to gradually separate from the waterproof pad, due to the relatively small gap between the sealing groove and the sealing rod and the sealing block, and the high air pressure between the bottom wall of the measuring cylinder and the partition box, the mixed liquid cannot enter the measuring cylinder from the sealing groove. However, when the partition box descends, the partition box pushes the gas in the space below the partition box, so that the gas between the partition box and the bottom wall of the measuring cylinder is gradually discharged from the sealing groove. That is, when the partition box descends, liquid enters the upper part of the partition box and exhausts the gas at the lower part. Similarly, when the partition box rises, liquid exits the upper part of the partition box and air enters the lower part, so as to ensure that the space between the bottom wall of the measuring cylinder and the partition box is always at standard atmospheric pressure, thereby allowing the partition box to move smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a process flow chart of an embodiment of the present application; Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 3 is along Figure 1 Schematic diagram of the cross-sectional structure along the AA line; Figure 4 This application is mainly used to show the cross-sectional structure diagram of the measuring cylinder, the upper mounting plate, the nozzle, the lower mounting plate, the pneumatic push rod, the waterproof pad, the partition box, the waterproof ring, the passive annular magnet, the active annular magnet, the air permeable component and the adjustment component of the hidden part of the bellows; Figure 5 This application is mainly used to show the cross-sectional structural diagram of the structure of the layered sampling assembly, monitor, light shield, cold light lamp, photoelectric sensor, nozzle, water supply pipe, etc.; Figure 6This application is mainly used to show the structural schematic diagram of the monitor, rolling switch, convex lens, second motor, sunshade, electric push rod and cold light lamp.

[0028] Figure numerals: 1, aeration tank; 11, water pipe; 12, drainage pipe; 13, floating block; 14, limit rod; 21, mounting frame; 211, motor; 212, connecting rod; 213, stirring rod; 22, measuring cylinder; 3, lifting assembly; 31, driving wheel; 32, driven wheel; 33, synchronous belt; 34, sliding rod; 4, layered sampling assembly; 41, upper mounting plate; 411, waterproof pad; 42, fixing rod; 43, lower mounting plate; 44, pneumatic push rod; 51, monitor; 51 1. Rolling switch; 512. Convex lens; 513. Second motor; 52. Sunshade; 521. Electric push rod; 53. Cold light lamp; 54. Photoelectric sensor; 61. Partition box; 62. Waterproof ring; 63. Passive annular magnet; 64. Active annular magnet; 7. Breathable component; 71. Sealing rod; 72. Sealing block; 73. Sealing groove; 8. Adjustment component; 81. Ear plate; 82. First motor; 83. Screw rod; 84. Bellows; 91. Nozzle; 92. Water supply pipe. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-6 This application is described in further detail.

[0030] The present application discloses a saponification wastewater recycling process for the production of medium and long chain triglycerides. Figure 1 The saponification wastewater recycling treatment process for medium and long chain triglyceride production includes the following steps: S1. Pretreatment: discharge the saponification wastewater into a sedimentation tank for sedimentation, remove the suspended solids and large particles in the saponification wastewater, add a demulsifier to the saponification wastewater to destroy the stability of the emulsion in the saponification wastewater, condense and separate the oil droplets, and then use an acid-base regulator to adjust the pH value of the wastewater to an appropriate range; S2. Coagulation and sedimentation: Add coagulants and flocculants to the saponified wastewater to make the fine particles and colloidal substances in the wastewater coagulate into larger particles and then settle down; S3, activated sludge deep treatment: the saponified wastewater treated by S1 and S2 is sent to the aeration tank 1 and fully mixed with the activated sludge in the aeration tank 1, and the organic matter in the wastewater is decomposed into harmless carbon dioxide, water and other harmless substances through the metabolism of microorganisms; S4. Membrane deep treatment: Use ultrafiltration, reverse osmosis and other membrane separation technologies to further remove tiny particles, dissolved organic matter and salt in the water, so that the discharged water quality reaches a higher standard, and the treated water is directly reused in the production process of medium and long-chain triglycerides; Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 In the activated sludge deep treatment step of S3, it is necessary to detect the data of SV in the mixed liquor, so as to calculate the sludge index and judge the flocculation and sedimentation properties of the sludge; the wall of the aeration tank 1 is provided with a water pipe 11 and a drainage pipe 12, and a mounting frame 21 is fixedly connected to the wall of the aeration tank 1, and a measuring cylinder 22 with a capacity of 1L and a transparent peripheral wall is slidably arranged on the mounting frame 21 in the vertical direction, and a lifting component 3 for lifting and lowering the measuring cylinder 22 is arranged on the mounting frame 21, and a layered sampling component 4 for sampling the mixed liquor of different depths with the measuring cylinder 22 is also arranged on the mounting frame 21, and a monitor 51 facing the measuring cylinder 22 is also arranged on the mounting frame 21 above the mixed liquor, and the monitor 51 is controlled by a background computer; The stratified sampling assembly 4 includes an upper mounting plate 41 arranged above the measuring cylinder 22, a fixing rod 42 fixedly connected to one end of the upper mounting plate 41 close to the measuring cylinder 22, a lower mounting plate 43 fixedly connected to one end of the fixing rod 42 away from the upper mounting plate 41, and a pneumatic push rod 44 fixedly connected to one end of the upper mounting plate 41 away from the measuring cylinder 22. The distance between the upper mounting plate 41 and the lower mounting plate 43 is greater than the height of the measuring cylinder 22. The open end of the measuring cylinder 22 is located at one end of the measuring cylinder 22 close to the upper mounting plate 41. There are multiple pneumatic push rods 44 and the output end of the pneumatic push rod 44 passes through the upper mounting plate 41 and is fixedly connected to the measuring cylinder 22. A waterproof pad 411 is glued to the bottom end of the upper mounting plate 41, and when the pneumatic push rod 44 is at the minimum stroke, the measuring cylinder 22 is tightly pressed against the waterproof pad 411.

[0031] In the aeration tank 1, it is only necessary to first lower the measuring cylinder 22 to the middle and high-level position through the lifting assembly 3, and then control the pneumatic push rod 44 to extend so that the measuring cylinder 22 is separated from the waterproof pad 411. At this time, the mixed liquid in the aeration tank 1 enters the measuring cylinder 22 through the gap between the waterproof pad 411 and the measuring cylinder 22. After a certain volume is collected, the pneumatic push rod 44 contracts so that the measuring cylinder 22 is pressed against the waterproof pad 411 again. At this time, the waterproof pad 411 and the measuring cylinder 22 are pressed against each other, and the mixed liquid can no longer enter the measuring cylinder 22. Then, the lifting assembly 3 controls the measuring cylinder 22 to continue to descend to other depths for sampling, and the mixed liquids at different depths are directly mixed without other mixing steps, and the sample error is effectively reduced. The sampling process is relatively simple, does not require a lot of manual operation, and has high manual safety. After the sampling is completed, the lifting assembly 3 raises the measuring cylinder 22 to above the liquid surface and allows it to stand still. The monitor 51 timely analyzes the status in the measuring cylinder 22 in real time through image processing, and the result analysis is relatively accurate.

[0032] Reference Figure 4 and Figure 5A partition box 61 is provided in the measuring cylinder 22 for sliding in the vertical direction, and a waterproof ring 62 is fixedly connected to the peripheral wall of the partition box 61 and is tightly pressed against the inner wall of the measuring cylinder 22. A passive annular magnet 63 is fixedly connected in the partition box 61, and the inner circle and outer circle of the passive annular magnet 63 are of the same polarity. An active annular magnet 64 is provided on the outer sleeve of the measuring cylinder 22, and a fixed rod 42 passes through the active magnet. The inner circle and outer circle of the active annular magnet 64 are of the same polarity. A breathable component 7 for controlling the air pressure between the bottom wall of the measuring cylinder 22 and the partition box 61 is provided on the lower mounting plate 43, and an adjusting component 8 for adjusting the position of the active annular magnet 64 is provided on the fixed rod 42. When the partition box 61 reaches the lowest point of the measuring cylinder 22, the volume above the partition box 61 in the measuring cylinder 22 is one liter.

[0033] When the measuring cylinder 22 is lowered to the specified position and the measuring cylinder 22 is separated from the waterproof pad 411, the adjusting component 8 adjusts the active annular magnet 64 to move downward, so that the passive annular magnet 63 also moves downward, that is, the partition box 61 moves downward, and the distance between the partition box 61 and the opening of the measuring cylinder 22 is used to accurately control the amount of liquid to be sampled at the current depth. At the same time, the air permeable component 7 is used to release the air between the partition box 61 and the bottom wall of the measuring cylinder 22 during the downward movement of the partition box 61, so that the partition box 61 can move downward smoothly; when the measured mixed liquid in the measuring cylinder 22 needs to be discharged after the detection is completed, the pneumatic push rod 44 pushes the measuring cylinder 22 downward to separate the space between the measuring cylinder 22 and the waterproof pad 411. Separate, and then adjust the active annular magnet 64 to move upward, so that the partition box 61 moves upward, and at the same time, the breathable component 7 gradually inflates the bottom of the measuring cylinder 22 and the partition box 61 until it is always at the standard air pressure. In this process, the partition box 61 moves upward to discharge the precipitated sludge, solution, etc. in the measuring cylinder 22. The breathable component 7 enables the partition box 61 to move smoothly, and the structure is simple. When the partition box 61 moves to be flush with the mouth of the measuring cylinder 22, the solution and sludge in the measuring cylinder 22 are basically discharged. In this process, the partition box 61 scrapes off the sludge adhered to the inner wall of the measuring cylinder 22, and only needs simple cleaning without going deep into the measuring cylinder 22 to start the next sampling and detection operation.

[0034] Reference Figure 4 The breathable component 7 includes a sealing rod 71 fixedly connected to the upper end of the lower mounting plate 43 and a sealing block 72 fixedly connected to the end of the sealing rod 71 away from the lower mounting plate 43. The sealing block 72 is in the shape of an inverted cone. The inner bottom wall of the measuring cylinder 22 is provided with a sealing groove 73 adapted to the sealing block 72. The surface of the sealing block 72 is made of elastic waterproof material, and when the measuring cylinder 22 is pressed against the waterproof pad 411, the sealing block 72 is pressed against the groove wall of the sealing groove 73. When the measuring cylinder 22 is separated from the waterproof pad 411, the sealing block 72 is separated from the groove wall of the sealing groove 73.

[0035] As the measuring cylinder 22 moves to gradually separate from the waterproof pad 411, the sealing rod 71 and the sealing block 72 remain stationary, but the movement of the measuring cylinder 22 causes the groove wall of the sealing groove 73 on the measuring cylinder 22 to also move downward, thereby separating the sealing block 72 from the groove wall of the sealing groove 73. At this time, since the gap between the sealing groove 73 and the sealing rod 71 and the sealing block 72 is relatively small, and the air pressure between the inner bottom wall of the measuring cylinder 22 and the partition box 61 is relatively large, the mixed liquid cannot enter the measuring cylinder 22 through the sealing groove 73. However, when the partition box 61 descends, the partition box 61 pushes the gas in the space below the partition box 61, so that the gas between the partition box 61 and the inner bottom wall of the measuring cylinder 22 is gradually discharged from the sealing groove 73, that is, the partition box 61 When descending, liquid enters from the top of the partition box 61 and exhausts from the bottom; after sampling of one liquid level is completed, the measuring cylinder 22 moves to be tightly pressed against the waterproof pad 411 again, and the groove wall of the sealing groove 73 is also moved to be tightly pressed against the sealing block 72 to prevent the mixed liquid from entering the measuring cylinder 22 from the sealing groove 73 due to unexpected circumstances; when the measuring cylinder 22 is above the liquid level and the test is completed and the liquid needs to be discharged, the measuring cylinder 22 moves to be separated from the waterproof pad 411, at this time, the groove wall of the sealing groove 73 is separated from the sealing block 72, and then the partition box 61 moves up to discharge water, and the outside gas enters the measuring cylinder 22 from the sealing groove 73, so that the inner bottom wall of the measuring cylinder 22 and the partition box 61 are always at standard atmospheric pressure, thereby allowing the partition box 61 to move smoothly.

[0036] Reference Figure 4 The adjusting assembly 8 includes an ear plate 81 fixedly connected to one end of the peripheral wall of the measuring cylinder 22 near the lower mounting plate 43, a first motor 82 fixedly connected to one end of the ear plate 81 near the lower mounting plate 43, and a screw rod 83 threadedly penetrated on the active annular magnet 64. The top of the peripheral wall of the measuring cylinder 22 is also fixedly connected to an ear plate 81 rotatably connected to the screw rod 83 to enhance the stability of the screw rod 83 during rotation. The adjusting assembly 8 also includes a bellows 84 arranged between the active annular magnet 64 and the ear plate 81, and between the ear plate 81 and the lower mounting plate 43. The screw rod 83 and the first motor 82 are both located in the bellows 84.

[0037] When the partition box 61 needs to be moved up, the first motor 82 drives the screw rod 83 to rotate, the screw rod 83 drives the active annular magnet 64 to move up, and the active annular magnet 64 drives the passive annular magnet 63 to move up, thereby moving the partition box 61 up; when it is necessary to split and move down, it is only necessary to adjust the first motor 82 in the opposite direction of the aforementioned output direction. During the movement of the active annular magnet 64, the positions of the active annular magnet 64, the first motor 82, and the active annular magnet 64 on the screw rod 83 are all changing, and the bellows 84 ensures that the active annular magnet 64 always maintains the liquid isolation between the screw rod 83 and the first motor 82 when moving, so as to prevent the first motor 82 from entering the liquid and the impurities such as sludge from adhering to the threads of the screw rod 83.

[0038] Reference Figure 5 and Figure 6A light shield 52 for covering the measuring cylinder 22 is fixedly connected to the mounting frame 21 above the liquid surface, the monitor 51 is located in the light shield 52, and a cold light lamp 53 emitting soft light is arranged on the inner wall of the light shield 52. A plurality of photoelectric sensors 54 are arranged in sequence along the vertical direction on the inner wall of the light shield 52 on the opposite side of the cold light lamp 53, each photoelectric sensor 54 is tightly fitted, and the height of all the photoelectric sensors 54 when combined together is not less than the liquid depth when the measuring cylinder 22 is full of liquid, and the inner wall of the light shield 52 is light-absorbing carbon black. An electric push rod 521 is fixedly connected to the top wall of the light shield 52, and the output end of the electric push rod 521 is fixedly connected to the monitor 51. A rolling switch 511 is provided at the end of the monitor 51 away from the measuring cylinder 22. The light shield 52 and the rolling switch 511 are tightly pressed against each other. A convex lens 512 is rotatably connected to the lower part of the end of the monitor 51 close to the measuring cylinder 22. A second motor 513 is fixedly connected to the monitor 51, and the output end of the second motor 513 is fixedly connected to the edge of the convex lens 512. The second motor 513 is electrically connected to the rolling switch 511. When the monitor 51 is facing the middle of the measuring cylinder 22, the second motor 513 drives the convex lens 512 to flip to the bottom of the monitor 51. When the monitor 51 is facing below the middle position of the measuring cylinder 22, the second motor 513 drives the convex lens 512 to flip to the front of the monitor 51. The light shield 52 blocks the ambient light, and the cold light lamp 53 shines on the measuring cylinder 22. When there is more sludge suspended in the mixed liquid, the amount of light passing through the measuring cylinder 22 is less, and the amount of light received by the photoelectric sensor 54 is less at this time. When most of the sludge in the mixed liquid has settled, the light transmittance of the supernatant in the measuring cylinder 22 is higher, and the photoelectric sensor 54 corresponding to the supernatant receives more light at this time. That is, during the sludge settling process, each photoelectric sensor 54 judges the sludge settling situation at the corresponding position in real time according to the change of light transmittance, and then the data of each photoelectric sensor 54 can be statistically analyzed by the background computer to obtain the detailed data of the sludge settling process and the final result in the measuring cylinder 22. When the sludge in the measuring cylinder 22 has settled, the light transmittance of the supernatant is higher, and the photoelectric sensor 54 corresponding to the supernatant receives more light. When the sedimentation is completed, the photoelectric sensor 54 determines the thickness of the activated sludge sedimentation, and the electric push rod 521 pushes the monitor 51 to move downward until the center position of the lens of the monitor 51 moves to the same height as the upper surface of the deposited sludge mass. During this process, the rolling switch 511 is rubbed by the light shield 52 and sends a signal. At this time, the second motor 513 drives the convex lens 512 to flip in front of the lens of the monitor 51 to magnify the scale on the measuring cylinder 22 corresponding to the sludge depth in the measuring cylinder 22 observed by the monitor 51, and the monitor 51 observes the sludge depth horizontally in a purely visual manner, which further reduces the detection error and avoids the error caused by the refraction of light when the monitor 51 is not at the same height as the sludge and the monitor 51 is tilted for observation.

[0039] Reference Figure 5, a nozzle 91 is fixedly connected through the center of the upper mounting plate 41, a water supply pipe 92 is provided through the top of the light shield 52, the part of the water supply pipe 92 located in the light shield 52 is a hard pipe, and the input end of the nozzle 91 is flared. When the upper mounting plate 41 moves to the highest point, the nozzle 91 is plugged into the water supply pipe 92. When the measuring cylinder 22 rises into the light shield 52, the water supply pipe 92 is plugged into the nozzle 91. When the measuring cylinder 22 is discharged and needs to be cleaned, the upper surface of the partition box 61 is flush with the mouth of the measuring cylinder 22, and then the water supply pipe 92 is turned on to supply water, so that the nozzle 91 sprays water to the upper surface of the partition box 61, and the sprayed water flow washes away the sludge adhering to the partition box 61. After the sludge on the partition box 61 is cleaned, the water supply pipe 92 stops supplying water, and the measuring cylinder 22 moves again to be tightly pressed against the waterproof pad 411, and then the next sampling and detection operation can be carried out.

[0040] Reference Figure 1 and Figure 5 , a motor 211 is fixedly connected to the top of the light shield 52, a horizontal connecting rod 212 is fixedly connected to the output end of the motor 211, and a stirring rod 213 inserted into the liquid surface is fixedly connected to the end of the connecting rod 212 away from the motor 211. Since the sampling operation can only be carried out after the aeration operation in the aeration tank 1 is completed, the sludge rolls in the mixed liquid due to the influence of the airflow during the aeration operation, but the sludge in the mixed liquid will gradually settle after the aeration is completed. The farther the sampling time is from the end of the aeration, the more sludge settles, and the greater the error of the final measurement result; before sampling, the motor 211 is turned on to make the output shaft of the motor 211 rotate back and forth, and the motor 211 drives the connecting rod 212 to rotate, and then the stirring rod 213 moves accordingly to stir the mixed liquid. The motor 211 is turned off at the beginning of the sampling operation, and then the sampling process is quickly completed, thereby effectively reducing the error of the final detection result.

[0041] Reference Figure 3 The lifting assembly 3 includes a driving wheel 31 rotatably connected to the mounting frame 21, a driven wheel 32, a synchronous belt 33 fixed to the lower mounting plate 43, and a slide bar 34 fixed to the bottom wall of the aeration tank 1. The synchronous belt 33 is meshedly connected to the driving wheel 31 and the driven wheel 32, and the slide bar 34 is passed through the lower mounting plate 43. When the measuring cylinder 22 needs to enter below the liquid surface for sampling or exit the liquid surface from the mixed liquid, the driving wheel 31 rotates to drive the synchronous belt 33 to move, and the synchronous belt 33 drives the lower mounting plate 43 to move. In this process, the slide bar 34 makes the lower mounting plate 43 more stable, with a simple structure and a high degree of resistance to harsh environments such as sludge.

[0042] Reference Figure 1The drain pipe 12 is a hose, and a floating block 13 is fixedly connected to the water inlet end of the drain pipe 12. The water inlet of the drain pipe 12 is immersed in the liquid surface. A limit rod 14 is fixedly connected in the vertical direction in the aeration tank 1, and the floating block 13 is slidably connected to the limit rod 14. When the aeration tank 1 is completed and needs to be drained, the water inlet of the drain pipe 12 is located at a higher liquid level of the mixed liquid due to the buoyancy of the floating block 13. When the drain pipe 12 is pumping water, the drain pipe 12 preferentially extracts the supernatant after precipitation. When the water inlet of the drain pipe 12 is located at a lower position, the extraction of the remaining liquid is stopped to avoid large suction force disturbing the sludge and causing a large amount of sludge to be extracted. After stopping the extraction, the saponified wastewater that has not been deeply treated with activated sludge is input into the aeration tank 1 through the water pipe 11 to start a new round of saponified wastewater treatment.

[0043] The implementation principle of the saponification wastewater recycling treatment process for medium- and long-chain triglyceride production in the embodiment of the present application is as follows: when the measuring cylinder 22 needs to enter below the liquid surface for sampling, the driving wheel 31 rotates to drive the synchronous belt 33 to move, and the synchronous belt 33 drives the lower mounting plate 43 to move until the measuring cylinder 22 reaches the specified position, and then the pneumatic push rod 44 is controlled to extend to separate the measuring cylinder 22 from the waterproof pad 411. At this time, the mixed liquid in the aeration tank 1 enters the measuring cylinder 22 through the gap between the waterproof pad 411 and the measuring cylinder 22, and at the same time, the sealing block 72 is also separated from the groove wall of the sealing groove 73; Then, the first motor 82 drives the screw rod 83 to rotate, and the screw rod 83 drives the active annular magnet 64 to move downward, and the active annular magnet 64 drives the passive annular magnet 63 to move downward, thereby causing the partition box 61 to move downward, and the partition box 61 pushes the gas in the space below the partition box 61, so that the gas between the partition box 61 and the inner bottom wall of the measuring cylinder 22 is gradually discharged from the sealing groove 73, and the mixed liquid in the aeration tank 1 enters the measuring cylinder 22 through the gap between the measuring cylinder 22 and the waterproof pad 411. When the partition box 61 moves to the point where the volume between the partition box 61 and the barrel mouth of the measuring cylinder 22 reaches the current liquid level sampling volume, the first motor 82 stops running, and then the pneumatic push rod 44 contracts, so that the measuring cylinder 22 and the waterproof pad 411 are pressed tightly together to complete the sampling of one liquid level, and then the above steps are repeated until the established sampling target is completed; After the sampling operation is completed, the driving wheel 31 rotates to drive the synchronous belt 33 to move, and the synchronous belt 33 drives the lower mounting plate 43 to move upward until the measuring cylinder 22 reaches the light shield 52, and the cold light lamp 53 is turned on. When most of the sludge in the mixed liquid has settled, the light transmittance of the measuring cylinder 22 is high. At this time, the photoelectric sensor 54 receives a large amount of light, that is, during the sludge settling process, each photoelectric sensor 54 judges the sludge settling situation at the corresponding position in real time according to the change of light transmittance. Then, the data of each photoelectric sensor 54 can be statistically analyzed by the background computer to obtain detailed data of the sludge settling process and the final result in the measuring cylinder 22. The monitor 51 also monitors the situation in the measuring cylinder 22 in real time through image processing technology. The results of the photoelectric sensor 54 cooperate with the monitor 51 to obtain more accurate data. After the detection is completed, the pneumatic push rod 44 pushes the measuring cylinder 22 downward, and the first motor 82 drives the screw rod 83 to rotate, so that the partition box 61 rises until the partition box 61 rises to be flush with the mouth of the measuring cylinder 22. At this time, the water supply pipe 92 starts to supply water, and the nozzle 91 flushes out the sludge remaining on the partition box 61. After the partition box 61 is cleaned, a new round of sampling and detection operations can be carried out again. At the same time, after the aeration of the aeration tank 1 is completed, the water inlet of the drain pipe 12 is located at a higher liquid level of the mixed liquid due to the buoyancy of the floating block 13. When the drain pipe 12 is pumping water, the drain pipe 12 preferentially extracts the supernatant after precipitation. When the water inlet of the drain pipe 12 is at a lower position, the remaining liquid is stopped from being pumped to avoid the large suction force disturbing the sludge and causing a large amount of sludge to be pumped out. After the drain pipe 12 stops pumping, the saponified wastewater that has not been deeply treated with activated sludge is input into the aeration tank 1 through the water pipe 11 to start a new round of saponified wastewater treatment.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A recycling treatment process for saponification wastewater from the production of medium and long chain triglycerides, characterized in that: The steps include: S1. Pretreatment: discharge the saponification wastewater into a sedimentation tank for sedimentation, remove the suspended solids and large particles in the saponification wastewater, add a demulsifier to the saponification wastewater to destroy the stability of the emulsion in the saponification wastewater, condense and separate the oil droplets, and then use an acid-base regulator to adjust the pH value of the wastewater to an appropriate range; S2. Coagulation and sedimentation: Add coagulants and flocculants to the saponified wastewater to make the fine particles and colloidal substances in the wastewater coagulate into larger particles and then settle down; S3, activated sludge deep treatment: the saponified wastewater treated by S1 and S2 is sent to the aeration tank (1) and fully mixed with the activated sludge in the aeration tank (1). The organic matter in the wastewater is decomposed into harmless carbon dioxide, water and other harmless substances through the metabolism of microorganisms. At the same time, the SV data in the mixed liquid needs to be detected in this process; S4. Membrane deep treatment: Use ultrafiltration, reverse osmosis and other membrane separation technologies to further remove tiny particles, soluble organic matter and salt in the water, so that the discharged water quality reaches higher standards and the treated water can be directly reused in the production process of medium and long-chain triglycerides.

2. A saponification wastewater recycling treatment device for medium- and long-chain triglyceride production, based on a saponification wastewater recycling treatment process for medium- and long-chain triglyceride production according to claim 1, characterized in that: The wall of the aeration tank (1) is provided with a water delivery pipe (11) and a drainage pipe (12); a mounting frame (21) is fixedly connected to the wall of the aeration tank (1); a measuring cylinder (22) with a capacity of 1 L and a transparent peripheral wall is slidably arranged on the mounting frame (21) in a vertical direction; a lifting assembly (3) for lifting the measuring cylinder (22) is arranged on the mounting frame (21); a stratified sampling assembly (4) for using the measuring cylinder (22) to sample mixed liquid at different depths is also arranged on the mounting frame (21); and a monitor (51) facing the measuring cylinder (22) is also arranged above the mixed liquid; The stratified sampling assembly (4) comprises an upper mounting plate (41) arranged above the measuring cylinder (22), a fixing rod (42) fixedly connected to an end of the upper mounting plate (41) close to the measuring cylinder (22), a lower mounting plate (43) fixedly connected to an end of the fixing rod (42) away from the upper mounting plate (41), and a pneumatic push rod (44) fixedly connected to an end of the upper mounting plate (41) away from the measuring cylinder (22), wherein the distance between the upper mounting plate (41) and the lower mounting plate (43) is greater than the distance between the measuring cylinder (22) and the measuring cylinder (22). The height of the measuring cylinder (22), the open end of the measuring cylinder (22) is located at one end of the measuring cylinder (22) close to the upper mounting plate (41), there are a plurality of pneumatic push rods (44), and the output end of the pneumatic push rod (44) passes through the upper mounting plate (41) and is fixedly connected to the measuring cylinder (22), a waterproof pad (411) is glued to the bottom end of the upper mounting plate (41), and when the pneumatic push rod (44) is at the minimum stroke, the measuring cylinder (22) and the waterproof pad (411) are tightly abutted; A partition box (61) is slidably arranged in the vertical direction in the measuring cylinder (22), and a waterproof ring (62) is fixedly connected to the peripheral wall of the partition box (61) and is tightly abutted against the inner wall of the measuring cylinder (22). A passive annular magnet (63) is fixedly connected to the partition box (61), and the inner ring and outer ring of the passive annular magnet (63) are of the same polarity. An active annular magnet (64) is arranged on the outer sleeve of the measuring cylinder (22), and the inner ring and outer ring of the active annular magnet (64) are of the same polarity. A ventilating component (7) for controlling the air pressure between the bottom wall of the measuring cylinder (22) and the partition box (61) is arranged on the lower mounting plate (43), and an adjusting component (8) for adjusting the position of the active annular magnet (64) is arranged on the fixing rod (42).

3. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 2, characterized in that: The venting assembly (7) comprises a sealing rod (71) fixedly connected to the upper end of the lower mounting plate (43) and a sealing block (72) fixedly connected to the end of the sealing rod (71) away from the lower mounting plate (43); the sealing block (72) is in the shape of an inverted cone; the inner bottom wall of the measuring cylinder (22) is provided with a sealing groove (73) adapted to the sealing block (72); the surface of the sealing block (72) is made of an elastic waterproof material; and when the measuring cylinder (22) is pressed against the waterproof pad (411), the sealing block (72) is pressed against the groove wall of the sealing groove (73); and when the measuring cylinder (22) is separated from the waterproof pad (411), the sealing block (72) is separated from the groove wall of the sealing groove (73).

4. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 2, characterized in that: The adjustment assembly (8) comprises an ear plate (81) fixedly connected to one end of the peripheral wall of the measuring cylinder (22) close to the lower mounting plate (43), a first motor (82) fixedly connected to one end of the ear plate (81) close to the lower mounting plate (43), and a screw rod (83) threadedly penetrated through the active annular magnet (64), and the adjustment assembly (8) further comprises a bellows (84) disposed between the active annular magnet (64) and the ear plate (81), and between the ear plate (81) and the lower mounting plate (43), and the screw rod (83) and the first motor (82) are both located in the bellows (84). The fixing rod (42) penetrates the active annular magnet (64).

5. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 2, characterized in that: A light shield (52) for covering the measuring cylinder (22) is fixedly connected to the mounting frame (21) above the liquid surface. The monitor (51) is located in the light shield (52). A cold light lamp (53) emitting soft light is arranged on the inner wall of the light shield (52). A plurality of photoelectric sensors (54) are arranged in sequence along the vertical direction on the inner wall of the light shield (52) on the opposite side of the cold light lamp (53). The inner wall of the light shield (52) is a carbon black color that absorbs light.

6. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 5, characterized in that: An electric push rod (521) is fixedly connected to the inner top wall of the light shield (52), and the output end of the electric push rod (521) is fixedly connected to the monitor (51). A rolling switch (511) is provided at one end of the monitor (51) away from the measuring cylinder (22). The light shield (52) and the rolling switch (511) are tightly abutted against each other. A convex lens (512) is rotatably connected below one end of the monitor (51) close to the measuring cylinder (22). A second motor is fixedly connected to the monitor (51). (513), the output end of the second motor (513) is fixedly connected to the edge of the convex lens (512), when the monitor (51) is facing the middle of the measuring cylinder (22), the second motor (513) drives the convex lens (512) to flip to below the monitor (51), and when the monitor (51) is facing below the middle position of the measuring cylinder (22), the second motor (513) drives the convex lens (512) to flip to the front of the monitor (51).

7. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 5, characterized in that: A nozzle (91) is fixedly connected to the center of the upper mounting plate (41), a water supply pipe (92) is provided through the top of the light shield (52), the portion of the water supply pipe (92) located inside the light shield (52) is a hard pipe, the input end of the nozzle (91) is flared, and when the upper mounting plate (41) moves to the highest point, the nozzle (91) is plugged into the water supply pipe (92).

8. The saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 5, characterized in that: A motor (211) is fixedly connected to the top of the light shield (52), a horizontal connecting rod (212) is fixedly connected to the output end of the motor (211), and a stirring rod (213) inserted into the liquid surface is fixedly connected to one end of the connecting rod (212) away from the motor (211).

9. A saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 2, characterized in that: The lifting assembly (3) comprises a driving wheel (31) rotatably connected to the mounting frame (21), a driven wheel (32), a synchronous belt (33) fixedly connected to the lower mounting plate (43), and a sliding rod (34) fixedly connected to the bottom wall of the aeration tank (1), the synchronous belt (33) being meshingly connected to the driving wheel (31) and the driven wheel (32), and the sliding rod (34) being passed through the lower mounting plate (43).

10. The saponification wastewater recycling treatment device for medium and long chain triglyceride production according to claim 2, characterized in that: The drainage pipe (12) is a hose, a floating block (13) is fixedly connected to the water inlet end of the drainage pipe (12), the water inlet of the drainage pipe (12) is immersed in the liquid surface, a limiting rod (14) is fixedly connected in the aeration tank (1) along the vertical direction, and the floating block (13) is slidably connected to the limiting rod (14).

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