Partitioned multi-stage amino acid production wastewater pollution prevention and control complete equipment

Abstract

The present application relates to industrial wastewater treatment and water pollution prevention equipment technical field, and disclose a kind of partition multistage amino acid production wastewater water pollution prevention complete equipment, including three groups of pretreatment tank, three groups of secondary treatment tank, load buffer mixing box and terminal processing box, three-way processing liquid respectively through low-diameter expansion liquid pipe, midstream drainage frame and high-level water curtain cloth liquid ware into mixing box, complete dispersion flow, buffer mixing and water curtain bubble breaking on inclined deflector, gas curtain cloth gas piece will liquid surface foam guide foam guide drop mouth, the intercepting plate in first mixing box, upper extrusion plate and push liquid plate linkage complete bubble breaking and liquid discharge, mixed liquid is again layered deflection into terminal processing box, the present application can reduce the air trapping and foam accumulation when the convergence of multiple waste liquid, improve mixing uniformity, liquid discharge stability and subsequent processing load stability.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment and water pollution control equipment, and in particular to a complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater. Background Technology

[0002] Amino acids are typically produced through processes such as microbial fermentation, separation and extraction, ion exchange, concentration and crystallization, and equipment cleaning. Different processes generate fermentation residues, ion exchange regeneration wastewater, crystallization mother liquor, washing wastewater, and floor washing wastewater. The pollutant composition of these wastewaters is not entirely the same, but they usually contain a large amount of soluble organic matter, nitrogenous compounds, residual amino acids, inorganic salts, and suspended impurities. Some wastewaters also exhibit large fluctuations in pH and rapid changes in pollution load. Existing treatment equipment often centrally sends wastewater from each process into a regulating tank, and then sequentially performs coagulation sedimentation, biochemical degradation, and filtration treatment. Because wastewater from different sources is not buffered or differentiated by region, high-concentration mother liquor or regeneration wastewater entering the treatment system can easily cause a surge in water volume and pollution load in a short period of time, making it difficult to stably control the dosage of front-end reagents and affecting the activity of microorganisms in the subsequent biochemical treatment area. Therefore, it is necessary to set up a complete set of equipment that can receive amino acid production wastewater in different regions according to its source and pollution level, and gradually reduce the pollution load through multi-stage treatment units.

[0003] The aforementioned and existing related technologies often suffer from the following defects: Existing amino acid production wastewater treatment equipment typically discharges multiple streams of liquid after ammonia removal, solid-liquid separation, and filtration directly into the same equalization or mixing tank via ordinary drain pipes. This lack of differentiated discharge, dispersion, and online bubble-breaking structures fails to account for the characteristics of ammonia removal effluent being prone to air entrainment and foam formation, the ease with which proteins and colloidal substances in high organic load effluent stabilize foam, and the differences in flow rates and pollution loads among the various effluent streams. Consequently, the entrained liquid forms numerous bubbles during pumping, pipe diameter changes, and free fall. These bubbles, upon contact with the high organic load liquid, transform into stable foam that is difficult to dissipate and enters subsequent flow channels with the mixed liquid. This occupies mixing space, interferes with continuous liquid flow and stable discharge, and causes instantaneous fluctuations in the volume of water and pollution load entering subsequent treatment units. Summary of the Invention

[0004] The technical problem to be solved by this invention is that in the prior art, when multiple waste liquids converge, gas is trapped and bubbles are formed, resulting in stable foam, which causes fluctuations in discharge and unstable loads in subsequent treatment. To address this, we propose a complete set of equipment for the prevention and control of water pollution in amino acid production wastewater in a zoned, multi-stage manner.

[0005] To achieve the above objectives, this application adopts the following technical solution: a complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater, comprising three sets of pretreatment tanks, three sets of secondary treatment tanks, a load buffer mixing tank, and a terminal treatment tank. The three sets of pretreatment tanks are connected to the three sets of secondary treatment tanks one by one. The three sets of secondary treatment tanks are connected to the terminal treatment tank via the load buffer mixing tank. The mixing tank of the load buffer mixing tank is provided with a first inclined guide plate and a second inclined guide plate with opposite inclination directions at intervals inside the mixing tank shell, and is provided with a first mixing tank and a second mixing tank for layer-by-layer flow.

[0006] The three sets of secondary treatment tanks are connected to the expanded diameter drop pipe, drainage frame and water curtain distributor above the first inclined guide plate via a liquid pump and a liquid discharge pipe, respectively. The distance between the three and the first inclined guide plate increases in sequence.

[0007] The drainage frame is equipped with a wedge-shaped guide block and a drainage hole facing the downward direction of the first inclined guide plate, and is equipped with an air curtain cloth component that is connected to the air pump and faces the high end of the first inclined guide plate. The high end is equipped with a foam guide outlet and a barrier strip.

[0008] The first mixing chamber is equipped with a flow cut-off plate, an upper extrusion plate, and a liquid pusher plate located below the upper extrusion plate. The upper extrusion plate and the liquid pusher plate are driven by the same linkage mechanism to move towards each other.

[0009] Preferably, the three sets of secondary treatment tanks include an ammonia removal treatment tank, a solid-liquid separation treatment tank, and a filtration and adsorption dechlorination treatment tank. The ammonia removal treatment tank is connected to an expanded diameter drop pipe through a corresponding liquid pump, the solid-liquid separation treatment tank is connected to a drain frame through a corresponding liquid pump, and the filtration and adsorption dechlorination treatment tank is connected to a water curtain distributor through a corresponding liquid pump.

[0010] Preferably, the mixing box shell is a closed square box, and pressure balancing mechanisms are respectively provided at the four corners of the upper end of the mixing box shell. The air pump is fixedly installed on the outside of the mixing box shell; three sets of liquid pumps are fixedly installed on the upper end of the mixing box shell, and each set of liquid pumps is equipped with a drive motor.

[0011] Preferably, the first inclined guide plate and the second inclined guide plate are arranged symmetrically at the center. The first mixing box is located at one end of the first inclined guide plate and the second inclined guide plate that are close to each other, and is fixedly connected to the side wall of the mixing box shell. The second mixing box is located on the other side of the second inclined guide plate that is close to the mixing box shell, and is fixedly connected to the bottom of the mixing box shell. Drainage grooves are provided on the opposite sides of the first mixing box and the second mixing box.

[0012] Preferably, the outlet cross-sectional area of ​​the expanded diameter downpipe is larger than the flow cross-sectional area of ​​the drain pipe connected to it; the wedge-shaped guide block is set at the lower end of the drain frame, and multiple sets of drain holes are spaced apart along the width direction of the drain frame; the lower end of the water curtain distributor is provided with a slit-shaped liquid outlet, which faces the liquid outlet confluence area of ​​the expanded diameter downpipe and the drain frame.

[0013] Preferably, the air curtain gas component is connected to the air pump through an air guide pipe, and the slotted air outlet of the air curtain gas component is located above the first inclined guide plate; the foam guide outlet is a square opening that penetrates the first inclined guide plate and corresponds vertically to the liquid receiving area of ​​the second mixing box; the barrier strip protrudes from the upper surface of the first inclined guide plate and is located on the side of the foam guide outlet closer to the main liquid flow.

[0014] Preferably, a pneumatic drive housing is provided near the first mixing chamber of the first inclined guide plate, and a pneumatic piston plate is slidably disposed inside the pneumatic drive housing. The pneumatic piston plate is fixedly connected to the throttling plate, and the throttling plate passes through the side wall of the first mixing chamber and is slidably connected to the first mixing chamber. The upper extrusion plate is disposed on the side of the throttling plate facing the inside of the first mixing chamber.

[0015] Preferably, the pneumatic drive housing is further provided with a second telescopic rod and a second elastic element sleeved on the outside of the second telescopic rod. The pneumatic piston plate divides the internal space of the pneumatic drive housing into a drive chamber and a compensation chamber, and the compensation chamber is connected to the filter breathing valve.

[0016] Preferably, a defoaming and drainage assembly is provided on one side of the first mixing tank. The defoaming and drainage assembly includes multiple sets of pressure transmitting cylinders arranged vertically. A piston disc is slidably arranged inside each set of pressure transmitting cylinders. A first telescopic rod is connected to one side of the piston disc. A first elastic element is sleeved on the outside of the first telescopic rod. A transmission rod is connected to the other side of the piston disc. The upper and lower corresponding pressure transmitting cylinders are connected through a pressure transmitting pipe and together with the pressure transmitting pipe form a closed pressure transmitting chamber filled with pressure transmitting liquid.

[0017] Preferably, the upper transmission rod passes through the corresponding pressure transmission cylinder and the first mixing box and is fixedly connected to the upper extrusion plate, and the lower transmission rod passes through the corresponding pressure transmission cylinder and the first mixing box and is fixedly connected to the liquid pusher plate; the upper extrusion plate and the liquid pusher plate are staggered and move from opposite sides of the first mixing box toward the center; a discharge gap is maintained between the intercepting plate and the water inlet channel of the first mixing box, and a sealing element is provided at the penetration position of each transmission rod and the first mixing box.

[0018] The technical effects and advantages of this invention are as follows:

[0019] In this invention, addressing the differences in foam formation caused by high ammonia nitrogen and high ion load treatment liquids, high organic load treatment liquids, and low pollution load treatment liquids, liquids are introduced into separate channels via a low-positioned expanding-diameter drop pipe, a mid-positioned drain frame, and a high-positioned water curtain distributor. This allows easily foaming liquids to fall at a reduced speed, high organic load liquids to disperse and spread, and low foaming liquids to form a sheet-like water curtain. Buffering and initial mixing are completed on the first inclined guide plate. The air curtain distribution component on the drain frame blows air along the first inclined guide plate towards its upper end, separating the surface foam from the main liquid flow and guiding it to the foam guide outlet. The main mixture enters the first mixing tank along the guide plate. The intercepting plate gradually reduces the inlet cross-section, the upper extrusion plate scrapes and breaks the upper foam, and the pusher plate simultaneously pushes the lower mixture toward the drainage tank. This forms a continuous treatment process of differentiated liquid discharge, water curtain flushing, air curtain guiding, interception and breaking, and liquid discharge. This can reduce the free fall of liquid and the local accumulation of foam, reduce the occupation of the effective volume of the tank and drainage channels by foam, extend the contact path of the multi-channel treatment liquid, improve the mixing uniformity, the stability of layer-by-layer flow and the continuity of liquid discharge, and reduce the instantaneous flow rate and pollution load fluctuations entering the terminal treatment tank. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of the pollution control equipment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the pollution control equipment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the load buffer mixing tank of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the overall structure of the load buffer mixing tank of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the internal structure of the load buffer mixing tank of the present invention; Figure 6 This is a schematic diagram of the internal structure of the load buffer mixing tank of the present invention; Figure 7 This is a schematic diagram of the structure of the first mixing tank and the defoaming and drainage component of the present invention; Figure 8 This is a schematic diagram of the planar structure of the first mixing tank and the defoaming and drainage component of the present invention; Figure 9 This is a schematic diagram of the moving structure of the upper extrusion plate and the liquid pushing plate of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the moving structure of the upper extrusion plate and the liquid pushing plate of the present invention. Figure 2 .

[0021] Legend: 1. Pretreatment tank; 2. Secondary treatment tank; 3. Load buffer mixing tank; 31. Mixing tank shell; 311. Pressure balancing mechanism; 312. Air pump; 32. Liquid pump; 321. Drive motor; 322. Drain pipe; 323. Expanded diameter drop pipe; 324. Drain frame; 3241. Wedge-shaped guide block; 3242. Drain hole; 3243. Air curtain gas component; 3244. Air guide pipe; 325. Water curtain liquid distributor; 33. First inclined guide plate; 331. Foam drop outlet; 332. Barrier strip; 333. Filter breathing valve; 334, pneumatic drive housing; 3341, flow cut-off plate; 3342, upper extrusion plate; 3343, pneumatic piston plate; 3344, second telescopic rod; 3345, second elastic element; 34, second inclined guide plate; 35, first mixing box; 351, drainage trough; 36, second mixing box; 37, defoaming and drainage assembly; 371, pressure transmission cylinder; 372, first telescopic rod; 3721, piston disc; 373, first elastic element; 374, transmission rod; 375, pressure transmission pipe; 376, liquid pusher plate; 4, terminal treatment box. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0023] The structure and working process of this embodiment will be further described below with reference to the accompanying drawings. The drawings are mainly used to show the connection relationship between the various components. In actual manufacturing, the volume of each tank, the diameter of the pipes, the liquid conveying flow rate, and the tilt angle of the guide plate can be determined according to the actual treatment volume and water quality of the amino acid production wastewater.

[0024] Reference Figure 1 As shown, this embodiment provides a complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater, including a pretreatment tank 1, a secondary treatment tank 2, a load buffer mixing tank 3, and a terminal treatment tank 4.

[0025] The pretreatment tank 1 is provided in three sets. The three sets of pretreatment tank 1 are used to receive waste liquid generated in different processes during amino acid production. In this embodiment, the three sets of pretreatment tank 1 respectively receive waste liquid with high ammonia nitrogen, high ion load, high organic load, and cleaning waste liquid with relatively low pollution load. After different waste liquids enter the corresponding pretreatment tank 1, they are temporarily stored and pretreated separately to avoid waste liquids with large differences in water quality from being directly mixed after entering the equipment, thereby reducing the impact of local pH changes, sudden increases in pollutant concentration, and interaction of suspended impurities on the subsequent treatment process.

[0026] The discharge ends of the three pretreatment tanks 1 are connected to the three secondary treatment tanks 2 one by one. The three secondary treatment tanks 2 carry out further treatment according to the water quality characteristics of the received waste liquid.

[0027] One of the secondary treatment tanks 2 is used to receive waste liquid with high ammonia nitrogen and high ion load, and to perform acid-base adjustment and ammonia removal treatment on this waste liquid. This waste liquid is prone to entrainment of air during the previous stripping, aeration or other gas-liquid contact process, and there may still be gas that has not been completely released in the treated liquid. When the liquid is discharged from the secondary treatment tank 2, and after being pumped, the pipe diameter changes and pressure changes, the entrained gas is easy to be released. Therefore, this liquid is regarded as the one that is most likely to generate bubbles and foam among the three treated liquids.

[0028] Another set of secondary treatment tanks 2 is used to receive high organic load waste liquid generated from fermentation, separation and other processes. After solid-liquid separation, the large particulate bacterial residue and suspended impurities in this waste liquid are reduced. However, the liquid still contains a certain amount of dissolved organic matter, residual amino acids, proteins, polypeptides and a small amount of colloidal substances. This liquid itself may not produce a large amount of gas, but the protein and colloidal components in it can easily keep the bubbles generated in other liquids stable, thus forming foam that is not easy to break on its own.

[0029] The remaining set of secondary treatment tanks 2 is used to receive cleaning waste liquid with a relatively low pollution load, and to filter, adsorb and dechlorinate the waste liquid to reduce the suspended impurities, surface active ingredients and residual chlorine content in the treated liquid. The treated liquid has a low degree of foaming and is used to supplement the mixing water volume. It also forms a sheet-like water curtain through the water curtain distributor 325. The liquid in this line is not easy to form stable foam and can be used to supplement the mixing water volume. It also participates in the mixing and defoaming of the three liquids in the form of a water curtain.

[0030] The discharge ends of the three secondary treatment tanks 2 are all connected to the load buffer mixing tank 3. The three treated liquids undergo differentiated liquid inlet, flow guidance, foam reduction and staged mixing in the load buffer mixing tank 3 in sequence. The mixed liquid is then discharged from the load buffer mixing tank 3 into the terminal treatment tank 4. The terminal treatment tank 4 is used for subsequent hydrolysis acidification, biochemical treatment, precipitation filtration or deep purification of the mixture.

[0031] Reference Figures 2 to 4 As shown, the load buffer mixing tank 3 includes a mixing tank shell 31, which is a closed square box. Pressure balancing mechanisms 311 are respectively provided at the four corners of the upper end of the mixing tank shell 31. The pressure balancing mechanisms 311 are used to balance the pressure inside and outside the mixing tank shell 31 during the process of liquid entry, gas input and liquid discharge, so as to reduce the formation of obvious positive or negative pressure inside the box.

[0032] The exhaust end of the pressure balancing mechanism 311 can be connected to the exhaust gas treatment structure through a pipeline, so that the ammonia-containing gas, water mist and odor gas discharged from the inside of the mixing box shell 31 can be absorbed or deodorized before being discharged to the outside.

[0033] An air pump 312 is fixedly installed on the outside of the mixing box shell 31. The air pump 312 is used to provide gas power for the subsequent airflow bubble guiding structure and pneumatic drive structure. The air supply end of the air pump 312 is provided with independent air supply branches, so that different air-using components can be started and stopped separately, avoiding the impact of one component working on the gas flow and pressure required by another component.

[0034] Three sets of liquid pumps 32 are fixedly installed on the upper end of the mixing tank shell 31. Each set of liquid pumps 32 is equipped with a drive motor 321. The inlet end of the three sets of liquid pumps 32 is connected to the outlet end of the three sets of secondary treatment tanks 2 respectively. The outlet end of the three sets of liquid pumps 32 is fixedly connected to the outlet pipe 322 respectively.

[0035] The three sets of pumps 32 can operate separately according to the flow rate and properties of the three liquids. It is not required that the three sets of pumps 32 simultaneously deliver liquid to the mixing tank shell 31 at the same flow rate. By adjusting the starting order of the three sets of pumps 32, the low foaming liquid can first form a basic water flow, and then the high organic load liquid and the easily foaming high ammonia nitrogen and high ion load liquid can be gradually added.

[0036] Reference Figures 4 to 6 As shown, a first inclined guide plate 33 and a second inclined guide plate 34 are fixedly installed inside the mixing tank shell 31. The first inclined guide plate 33 and the second inclined guide plate 34 are arranged at intervals in the vertical direction, with opposite inclination directions, and are centrally symmetrically arranged inside the mixing tank shell 31.

[0037] A first mixing chamber 35 is provided at one end of the first inclined guide plate 33 and the second inclined guide plate 34 that are close to each other. The first mixing chamber 35 is fixedly connected to the side wall of the mixing chamber shell 31. A second mixing chamber 36 is provided at the other side of the second inclined guide plate 34 that is close to the mixing chamber shell 31. The second mixing chamber 36 is fixedly connected to the bottom of the mixing chamber shell 31.

[0038] The first inclined guide plate 33, the first mixing box 35, the second inclined guide plate 34, and the second mixing box 36 together divide the interior of the mixing box shell 31 into three processing spaces distributed vertically.

[0039] The upper processing space is used to receive the three-way processed liquid, allowing the three liquids to make initial contact on the first inclined guide plate 33, while guiding and reducing the foam formed during the mixing process. The middle processing space is used to make the mixed liquid flow in the opposite direction along the second inclined guide plate 34, extending the flow path of the liquid and performing secondary mixing during the flow. The lower processing space is used to temporarily store the mixed liquid and buffer the flow rate of the liquid entering the terminal processing tank 4.

[0040] Drainage channels 351 are provided on the side of the first mixing box 35 and the second mixing box 36 that are close to each other. The extension direction of the drainage channels 351 is adapted to the tilt direction of the second inclined guide plate 34.

[0041] The liquid in the first mixing tank 35 flows into the middle processing space through the corresponding drainage channel 351. The liquid in the middle processing space flows to the second mixing tank 36 along the second inclined guide plate 34 and enters the lower processing space through the drainage channel 351 on the second mixing tank 36. The drainage channel 351 can be configured as a long strip-shaped slot extending along the liquid flow direction, or it can be configured as multiple sets of spaced holes to reduce the local impact caused by the concentrated drop of liquid from a single position.

[0042] Reference Figure 5 and Figure 6 As shown, the ends of the three sets of drainage pipes 322 are respectively provided with different liquid outlet structures, and the distance between the three liquid outlet structures and the first inclined guide plate 33 is different.

[0043] A set of drain pipes 322 corresponding to high ammonia nitrogen and high ion load liquids are fixedly installed with an enlarged diameter drop pipe 323 at the end. The enlarged diameter drop pipe 323 is located above the first inclined guide plate 33 and is at the lowest position among the three liquid outlet structures. The distance between the liquid outlet end of the enlarged diameter drop pipe 323 and the first inclined guide plate 33 is the smallest.

[0044] The outlet cross-sectional area of ​​the expanded diameter downpipe 323 is larger than the flow cross-sectional area of ​​the corresponding drain pipe 322. After the high ammonia nitrogen and high ion load liquid enters the expanded diameter downpipe 323, the discharge velocity decreases with the increase of the flow cross-section, making it less likely for the large air bubbles entrained in the liquid to be sheared by the high-speed water flow. At the same time, the expanded diameter downpipe 323 is set close to the first inclined guide plate 33, which can shorten the free fall distance of the liquid and reduce the continued entrainment of air in the liquid during the discharge process. If the liquid in this path is directly dropped from a higher position using an ordinary thin pipe, the gas entrained in the previous treatment process will be concentrated and precipitated when the liquid is discharged and the pressure changes. The free fall of the liquid will also entrain new air, which is likely to form more air bubbles on the first inclined guide plate 33. After the liquid in this path enters the load buffer mixing tank 3, the residual nitrogen-containing substances, inorganic salts and acid and alkali loads can be gradually dispersed into the overall mixture, avoiding the high ammonia nitrogen and high ion load liquid from directly entering the terminal treatment tank 4 with a large instantaneous flow rate, which would cause a load impact on the subsequent biochemical treatment.

[0045] A set of drain pipes 322 located in the middle is fixedly installed with a drain frame 324 at its end. The drain frame 324 corresponds to the high organic load liquid. A wedge-shaped guide block 3241 is provided at the lower end of the drain frame 324. Multiple sets of drain holes 3242 are opened on one side of the wedge-shaped guide block 3241. The liquid outlet direction of the multiple sets of drain holes 3242 is consistent with the downward tilting direction of the first inclined guide plate 33. After the high organic load liquid enters the drain frame 324, it is guided by the wedge-shaped guide block 3241 and gradually dispersed along the width direction of the drain frame 324. Then it is evenly discharged through the multiple sets of drain holes 3242. The discharged liquid is discharged through the first inclined guide plate 33. A relatively wide thin layer of water flow is formed on the inclined guide plate 33. After the high ammonia nitrogen and high ion load liquid discharged from the expanded diameter drop pipe 323 falls onto the thin layer of water flow formed by the high organic load liquid, the impact generated by the concentrated fall is buffered. The first liquid and the entrained bubbles are also spread out by the thin layer of water flow. At the same time, the protein, polypeptide and colloidal components in the high organic load liquid may keep the bubbles in the first liquid for a longer time. Therefore, the drain frame 324 is not only used to disperse the second liquid, but also to spread the two liquids and the foam formed on their surface evenly, so as to avoid the foam from accumulating in a local position of the first inclined guide plate 33.

[0046] An air curtain component 3243 is fixedly installed on the upper inner side of the drainage frame 324. The air curtain component 3243 is connected to an air supply branch of the air pump 312 through an air guide pipe 3244. The air curtain component 3243 is provided with a slotted air outlet facing the higher end of the first inclined guide plate 33.

[0047] When the air pump 312 delivers gas to the air curtain gas component 3243, the airflow is discharged from the slotted air outlet and flows along the top of the first inclined guide plate 33 toward its higher end. This airflow mainly acts on the foam above the liquid surface and close to the liquid surface, and does not directly enter the liquid interior, so as to avoid the formation of more small bubbles in the mixture due to aeration.

[0048] The foam generated by the liquid discharged from the expanded diameter drop pipe 323 during its descent and contact with the high organic load liquid is gradually moved towards the higher end of the first inclined guide plate 33 under the push of the airflow, reducing the foam from continuing to flow towards the first mixing tank 35 with the main liquid flow.

[0049] The remaining set of drain pipes 322 is fixedly installed with a water curtain distributor 325. The water curtain distributor 325 corresponds to the cleaning waste liquid with relatively low pollution load and low foaming degree. The water curtain distributor 325 is set at the highest position among the three liquid outlet structures. A slit-shaped liquid outlet is provided at its lower end. When the low foaming liquid is discharged through the slit-shaped liquid outlet, it forms a continuous sheet-like water curtain. The water curtain is directed towards the confluence area of ​​the first liquid discharged from the expanded diameter downpipe 323 and the second liquid discharged from the drain frame 324.

[0050] The sheet-like water curtain can continuously impact the already formed foam, causing the liquid inside the foam film to be discharged more quickly, and some bubbles to burst. At the same time, the low-pollution load liquid can replenish the base water volume, reduce the local concentration of high ammonia nitrogen, high ion load liquid and high organic load liquid, and expand the contact range between the three liquids.

[0051] The 325 water curtain distributor uses a continuous, low-pressure sheet-like discharge method instead of an atomizing spray method to avoid the water flow from being atomized and entraining too much air, which would generate new fine bubbles.

[0052] The three liquid outlet structures, arranged from closest to furthest from the first inclined guide plate 33, are an expanded diameter drop pipe 323, a drain frame 324, and a water curtain distributor 325, thus forming a liquid inlet relationship of low-level slow release, mid-level spread flow, and high-level water curtain.

[0053] A foam guide opening 331 is provided at the higher end of the first inclined guide plate 33. The foam guide opening 331 is a square opening that penetrates the first inclined guide plate 33. A barrier strip 332 is fixedly installed on one side of the foam guide opening 331. The barrier strip 332 is higher than the upper surface of the first inclined guide plate 33.

[0054] The barrier strip 332 is used to prevent the main liquid flowing along the first inclined guide plate 33 from directly entering the foam guide port 331. The density of the foam is lower than that of the main liquid. Under the action of the transverse airflow formed by the air curtain gas component 3243, the foam can gradually pass over the barrier strip 332 and move downward through the foam guide port 331.

[0055] The foam guide port 331 corresponds vertically to the liquid receiving area of ​​the second mixing tank 36. After the foam falls through the foam guide port 331, it enters the second mixing tank 36. The foam is impacted during the fall and is disturbed by the internal liquid flow after entering the second mixing tank 36. The foam film gradually breaks down, and the liquid formed after the breakage flows back into the mixed water flow.

[0056] The foam guide port 331 is mainly used to guide and reduce the foam and larger entrained air bubbles that have formed on the liquid surface, but it is not used to remove all dissolved gases in the liquid.

[0057] Reference Figures 7 to 10 As shown, a pneumatic drive housing 334 is provided near the first mixing box 35 on the first inclined guide plate 33, and a pneumatic piston plate 3343 is slidably installed inside the pneumatic drive housing 334.

[0058] A flow-blocking plate 3341 is provided on one side of the pneumatic piston plate 3343. The flow-blocking plate 3341 penetrates the side wall of the first mixing box 35 and is slidably connected to the first mixing box 35. An upper extrusion plate 3342 is provided on the side of the flow-blocking plate 3341 facing the inside of the first mixing box 35.

[0059] The pneumatic drive housing 334 is also provided with a second telescopic rod 3344 inside. A second elastic element 3345 is sleeved on the outside of the second telescopic rod 3344. One end of the second elastic element 3345 is fixedly connected to the pneumatic drive housing 334, and the other end of the second elastic element 3345 is fixedly connected to the pneumatic piston plate 3343. The second telescopic rod 3344 is used to guide the pneumatic piston plate 3343 to reciprocate along a predetermined direction. The second elastic element 3345 is used to push the pneumatic piston plate 3343 back to the initial position after the gas driving force is released.

[0060] The pneumatic piston plate 3343 divides the internal space of the pneumatic drive housing 334 into a drive chamber and a compensation chamber, and the compensation chamber is connected to the filter breathing valve 333.

[0061] The filter breathing valve 333 is capable of bidirectional gas exchange. It has a breathable filter element inside. When the air pump 312 delivers gas to the drive chamber, the pneumatic piston plate 3343 moves forward, and the volume of the compensation chamber decreases accordingly. The air in the compensation chamber is discharged to the outside through the filter breathing valve 333.

[0062] When the connection between the air pump 312 and the drive chamber is cut off and the gas in the drive chamber is discharged, the second elastic element 3345 pushes the pneumatic piston plate 3343 to reset, and the volume of the compensation chamber gradually increases. External air enters the compensation chamber through the filter breathing valve 333 to avoid the formation of negative pressure in the compensation chamber and thus prevent the pneumatic piston plate 3343 from resetting.

[0063] The filter breathing valve 333 is only connected to the compensation chamber and not to the drive chamber supplied by the air pump 312, so as to prevent the gas supplied into the drive chamber from being directly leaked out through the filter breathing valve 333.

[0064] A defoaming and drainage assembly 37 is provided on one side of the first mixing tank 35. The defoaming and drainage assembly 37 includes multiple sets of pressure transmission cylinders 371 arranged vertically, and a piston disc 3721 is slidably arranged inside each set of pressure transmission cylinders 371.

[0065] A first telescopic rod 372 is fixedly connected to one side of the piston disc 3721. A first elastic element 373 is sleeved on the outer side of the first telescopic rod 372. One end of the first elastic element 373 is connected to the inner wall of the pressure transmission cylinder 371, and the other end is connected to or abuts against the piston disc 3721, which is used to push the piston disc 3721 to reset after the external pressure is released.

[0066] A transmission rod 374 is fixedly connected to the other side of the piston disc 3721. The transmission rod 374 located at the upper part passes through the corresponding pressure transmission cylinder 371 and the first mixing box 35, and is fixedly connected to the upper extrusion plate 3342; the transmission rod 374 located at the lower part passes through the corresponding pressure transmission cylinder 371 and the first mixing box 35, and is fixedly connected to the liquid pusher plate 376.

[0067] The upper and lower pressure-transmitting cylinders 371 are connected by a pressure-transmitting pipe 375. The closed space formed by the pressure-transmitting cylinders 371 and the pressure-transmitting pipe 375 is filled with a low-compressibility pressure-transmitting liquid. The pressure-transmitting liquid can be hydraulic oil or other hydraulic media compatible with the sealing material. Using liquid as the pressure-transmitting medium can reduce the action delay caused by gas compression, so that the force on the upper piston disc 3721 can be transmitted to the lower piston disc 3721 more quickly. This is beneficial for the multiple sets of transmission rods 374 and the pusher plate 376 to maintain a relatively synchronized action state.

[0068] Each transmission rod 374 is equipped with a seal at the position where it passes through the first mixing box 35, in order to reduce the amount of waste liquid in the first mixing box 35 entering the pressure transmission cylinder 371, and at the same time prevent the pressure transmission liquid from entering the first mixing box 35.

[0069] When the mixed liquid in the upper processing space enters the first mixing tank 35 along the first inclined guide plate 33, the air pump 312 supplies gas to the drive chamber of the pneumatic drive housing 334 through the air supply reversing valve. The pneumatic piston plate 3343 moves forward under the action of air pressure, and drives the intercepting plate 3341 and the upper extrusion plate 3342 to move into the interior of the first mixing tank 35. After the intercepting plate 3341 extends into the water inlet area of ​​the first mixing tank 35, it reduces the effective water inlet section of the first mixing tank 35, thereby reducing the speed at which the upstream liquid enters the first mixing tank 35. A drainage gap is always maintained between the intercepting plate 3341 and the first mixing tank 35, so as not to completely close the water inlet channel of the first mixing tank 35. This can reduce the interference of subsequent water inlet on the defoaming process and prevent the first mixing tank 35 from forming a closed high-pressure liquid chamber during the extrusion process.

[0070] When the upper extrusion plate 3342 moves towards the center of the first mixing tank 35, it pushes the upper transmission rod 374 and the corresponding piston disc 3721 to move. The pressure-transmitting liquid in the upper pressure-transmitting cylinder 371 is squeezed and enters the lower pressure-transmitting cylinder 371 through the pressure-transmitting pipe 375. The pressure-transmitting liquid entering the lower pressure-transmitting cylinder 371 pushes the lower piston disc 3721 and the corresponding transmission rod 374 to move. The lower transmission rod 374 drives the pusher plate 376 to move from the other side of the first mixing tank 35 towards the center. The upper extrusion plate 3342 and the pusher plate 376 are arranged opposite to each other, and their moving directions are opposite. During a single drive of the pneumatic piston plate 3343, the upper extrusion plate 3342 and the pusher plate 3721 move in opposite directions. 76 gradually approaches each other from both sides of the first mixing tank 35 and moves to the vicinity of the vertical cross-sections that are close to each other. When the upper extrusion plate 3342 moves toward the middle of the first mixing tank 35, it scrapes and presses the foam gathered at the top of the first mixing tank 35, causing the liquid in the foam film to be discharged and promoting the aggregation of adjacent bubbles. The pusher plate 376 is located below the upper extrusion plate 3342 and moves from the other side of the first mixing tank 35 toward the drain trough 351 to push the mixed liquid below the foam to flow faster toward the drain trough 351. When the upper extrusion plate 3342 and the pusher plate 376 move to the predetermined position, they connect with each other vertically to form a temporary pushing surface, reducing the backflow of liquid and foam to the water inlet side.

[0071] During its movement, the pusher plate 376 can also push the mixture in the first mixing tank 35 toward the drain trough 351, so that the liquid can quickly enter the middle processing space through the drain trough 351. The interceptor plate 3341 slows down the continued water intake, and the upper extrusion plate 3342 and the pusher plate 376 simultaneously break bubbles and push liquid, which can reduce the continuous accumulation of foam in the first mixing tank 35 and improve the efficiency of the first mixing tank 35 to drain liquid to the next layer in stages.

[0072] When the upper extrusion plate 3342 and the liquid pusher plate 376 move to the predetermined position, the air supply reversing valve cuts off the connection between the air pump 312 and the drive chamber, and discharges the gas in the drive chamber. The second elastic element 3345 pushes the pneumatic piston plate 3343, the flow cut-off plate 3341 and the upper extrusion plate 3342 back to the initial position. At the same time, the first elastic element 373 pushes each piston disc 3721 to reset. The pressure-transmitting liquid flows in the reverse direction through the pressure-transmitting pipe 375. The liquid pusher plate 376 returns to the other side of the first mixing tank 35. The upper extrusion plate 3342 and the liquid pusher plate 376 separate again, and the first mixing tank 35 returns to the normal water intake state.

[0073] The foam breaking and drainage component 37 operates intermittently and can be started according to the liquid level in the first mixing tank 35, the degree of foam accumulation, or the running time of the three sets of pumps 32, without needing to maintain a constant squeezing state.

[0074] When the equipment is running, the three sets of pretreatment tanks 1 receive wastewater from different sources during the amino acid production process. After the wastewater is pretreated, it enters the corresponding secondary treatment tank 2. The liquid discharged from the three sets of secondary treatment tanks 2 is transported to the load buffer mixing tank 3 by three sets of liquid pumps 32.

[0075] High ammonia nitrogen and high ion load liquids are decelerated by the expanded diameter drop pipe 323 and discharged from a low position near the first inclined guide plate 33. High organic load liquids are evenly spread on the first inclined guide plate 33 through the drain frame 324, wedge-shaped guide block 3241 and multiple sets of drain holes 3242. Low pollution load liquids are formed into a sheet-like water curtain by the water curtain distributor 325 and fall into the confluence area of ​​the two liquids.

[0076] The three liquids undergo initial mixing on the first inclined guide plate 33. The water curtain impacts some of the foam formed during the mixing process, and the air curtain distribution component 3243 pushes the foam still floating above the liquid surface toward the foam guide outlet 331.

[0077] The main mixture enters the first mixing tank 35 along the first inclined guide plate 33. The foam in the first mixing tank 35 is intermittently squeezed by the foam breaking and liquid discharging component 37. After foam breaking and liquid discharging, the mixture enters the central processing space through the drainage trough 351.

[0078] The mixture flows in the opposite direction along the second inclined guide plate 34 in the middle processing space and continues to mix during the flow. It then enters the second mixing tank 36 and flows into the lower processing space through the drainage channel 351 on the second mixing tank 36.

[0079] The lower processing space temporarily stores and buffers the flow of the mixed liquid, reducing the flow fluctuations caused by the intermittent liquid injection of the three sets of liquid pumps 32. After the liquid reaches the set level, it is discharged from the discharge end of the load buffer mixing tank 3 into the terminal processing tank 4 for subsequent processing.

[0080] If all three liquids are discharged from the same height into the mixing tank shell 31 using ordinary drain pipes, the easily foaming high ammonia nitrogen and high ion load liquids are prone to air entrainment during free fall, and their original entrained gases may also be concentrated and precipitated. The protein and colloidal components in the high organic load liquid will keep the bubbles stable, causing the foam to accumulate in the first inclined guide plate 33 and the first mixing tank 35.

[0081] After a large amount of foam accumulates, it will occupy the effective space of the mixing tank shell 31 and may enter the drainage tank 351 with the liquid, causing fluctuations in the drainage flow. Some bubbles may also gather in local positions of the inclined guide plate, forming air pockets and affecting the continuous flow of liquid from top to bottom.

[0082] This embodiment employs a liquid inlet method of low-level expansion and slow release, mid-level dispersion and spread, and high-level water curtain impact. Combined with an air curtain bubble guide, foam guide and squeeze-type bubble breaking and drainage structure, it can reduce the amount of foam on the liquid surface and large entrained bubbles entering the next processing space with the mixed liquid. Two guide plates with opposite inclination directions extend the flow path of the liquid in the mixing tank shell 31 and reduce the situation where the liquid flows directly from the inlet position to the outlet position, so that the liquid after the three-way treatment can be more fully mixed and the flow rate buffered before entering the terminal treatment tank 4.

[0083] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater, comprising three sets of pretreatment tanks, three sets of secondary treatment tanks, a load buffer mixing tank, and a terminal treatment tank, wherein the three sets of pretreatment tanks are connected to the three sets of secondary treatment tanks one by one, and the three sets of secondary treatment tanks are connected to the terminal treatment tank via the load buffer mixing tank, characterized in that: The load buffer mixing tank has a first inclined guide plate and a second inclined guide plate with opposite inclination directions arranged at intervals inside the mixing tank shell, and a first mixing tank and a second mixing tank for layer-by-layer flow. The three sets of secondary treatment tanks are respectively connected to the expanded diameter drop pipe, the drainage frame and the water curtain distributor above the first inclined guide plate via a liquid pump and a liquid discharge pipe. The distance between the expanded diameter drop pipe, the drainage frame and the water curtain distributor and the first inclined guide plate increases sequentially. The drainage frame is provided with a wedge-shaped guide block and a drainage hole facing the downward direction of the first inclined guide plate, and is provided with an air curtain cloth component that is connected to the air pump and exits the air towards the high end of the first inclined guide plate. The higher end of the first inclined guide plate is provided with a foam guide outlet and a barrier strip. The first mixing chamber is provided with a flow cut-off plate, an upper extrusion plate and a liquid pusher plate located below the upper extrusion plate. The upper extrusion plate and the liquid pusher plate are connected by a pressure transmission linkage structure. The pressure transmission linkage structure is used to drive the liquid pusher plate to move from the opposite side of the first mixing chamber to the center when the upper extrusion plate moves.

2. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: The three sets of secondary treatment tanks include an ammonia removal treatment tank, a solid-liquid separation treatment tank, and a filtration and adsorption dechlorination treatment tank. The ammonia removal treatment tank is connected to an expanded diameter drop pipe through a corresponding liquid pump. The solid-liquid separation treatment tank is connected to a drain frame through a corresponding liquid pump. The filtration and adsorption dechlorination treatment tank is connected to a water curtain distributor through a corresponding liquid pump.

3. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: The mixing tank has a closed square shell. Pressure balancing mechanisms are installed at the four corners of the upper part of the mixing tank shell. The air pump is fixedly installed on the outside of the mixing tank shell. Three sets of liquid pumps are fixedly installed on the upper part of the mixing tank shell, and each set of liquid pumps is equipped with a drive motor.

4. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: The first inclined guide plate and the second inclined guide plate are arranged symmetrically at the center. The first mixing box is located at one end of the first inclined guide plate and the second inclined guide plate that are close to each other, and is fixedly connected to the side wall of the mixing box shell. The second mixing box is located on the other side of the second inclined guide plate that is close to the mixing box shell, and is fixedly connected to the bottom of the mixing box shell. Drainage grooves are provided on the opposite sides of the first mixing box and the second mixing box.

5. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: The outlet cross-sectional area of ​​the expanded diameter drop pipe is larger than the flow cross-sectional area of ​​the drain pipe connected to it; the wedge-shaped guide block is set at the lower end of the drain frame, and multiple sets of drain holes are spaced apart along the width direction of the drain frame; the lower end of the water curtain distributor is provided with a slit-shaped liquid outlet, which faces the liquid outlet confluence area of ​​the expanded diameter drop pipe and the drain frame.

6. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: The air curtain gas component is connected to the air pump through an air guide pipe, and the slotted air outlet of the air curtain gas component is located above the first inclined guide plate; the foam guide outlet is a square opening that penetrates the first inclined guide plate and corresponds vertically to the liquid receiving area of ​​the second mixing tank; the barrier strip protrudes from the upper surface of the first inclined guide plate and is located on the side of the foam guide outlet closer to the main liquid flow.

7. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 1, characterized in that: A pneumatic drive housing is provided near the first mixing chamber of the first inclined guide plate. A pneumatic piston plate is slidably disposed inside the pneumatic drive housing. The pneumatic piston plate is fixedly connected to the choke plate. The choke plate passes through the side wall of the first mixing chamber and is slidably connected to the first mixing chamber. The upper extrusion plate is disposed on the side of the choke plate facing the inside of the first mixing chamber.

8. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 7, characterized in that: The pneumatic drive housing is further provided with a second telescopic rod and a second elastic element sleeved on the outside of the second telescopic rod. The pneumatic piston plate divides the internal space of the pneumatic drive housing into a drive chamber and a compensation chamber. The compensation chamber is connected to the filter breathing valve.

9. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 7, characterized in that: A defoaming and drainage assembly is provided on one side of the first mixing tank. The defoaming and drainage assembly includes multiple sets of pressure-transmitting cylinders arranged vertically. A piston disc is slidably arranged inside each set of pressure-transmitting cylinders. A first telescopic rod is connected to one side of the piston disc. A first elastic element is sleeved on the outside of the first telescopic rod. A transmission rod is connected to the other side of the piston disc. The upper and lower corresponding pressure-transmitting cylinders are connected through a pressure-transmitting pipe and together with the pressure-transmitting pipe, they form a closed pressure-transmitting chamber filled with pressure-transmitting liquid.

10. The complete set of equipment for the prevention and control of water pollution from multi-stage amino acid production wastewater according to claim 9, characterized in that: The upper transmission rod passes through the corresponding pressure transmission cylinder and the first mixing box and is fixedly connected to the upper extrusion plate. The lower transmission rod passes through the corresponding pressure transmission cylinder and the first mixing box and is fixedly connected to the liquid pusher plate. The upper extrusion plate and the liquid pusher plate are staggered and move from opposite sides of the first mixing box toward the center. A discharge gap is maintained between the flow cut-off plate and the water inlet channel of the first mixing box. A sealing element is provided at the penetration position of each transmission rod and the first mixing box.

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