Lactic acid production wastewater treatment system

Abstract

The invention discloses a lactic acid production wastewater treatment system which comprises a treatment cylinder, a supporting frame is installed at the lower end of the treatment cylinder, a liquid adding opening is formed in the inner top of the treatment cylinder, a slag discharging pipe is arranged at the inner bottom of the treatment cylinder, and manual valves are installed in the liquid adding opening and the slag discharging pipe; the mixing mechanism comprises a rotating shaft rotationally connected to the inner top of the treatment barrel, a plurality of stirring rods are installed on the outer side of the rotating shaft, a driving motor is arranged on the inner wall of the left side of the treatment barrel, the driving motor is a double-shaft motor, and a right output shaft of the driving motor extends into the treatment barrel and is provided with a first bevel gear. According to the treatment system, in the actual use process, when flocculating settling operation is carried out, actual steps are optimized, the treatment efficiency is effectively improved, operation of workers is facilitated, in addition, deoxidation treatment is carried out on wastewater, and follow-up anaerobic reaction is facilitated.

Description

Technical Field

[0001] The invention relates to the field of lactic acid production wastewater treatment, and in particular to a lactic acid production wastewater treatment system. Background Art

[0002] The main characteristics of lactic acid wastewater include high concentrations of lactic acid, organic matter (such as COD, BOD, etc.) and microorganisms. The harm of these pollutants to the environment is mainly reflected in organic pollution, biological pollution and nutrient pollution. Specifically, the decomposition of organic matter in wastewater will produce odors and affect air quality; microorganisms such as bacteria and viruses will damage the water ecosystem; excessive discharge of nutrients such as nitrogen and phosphorus contained in wastewater will lead to eutrophication of water bodies, causing excessive algae growth and water pollution. Its treatment generally includes pretreatment, anaerobic treatment and aerobic treatment, among which pretreatment is mainly for the removal of suspended impurities, while anaerobic treatment and aerobic treatment are mainly for the removal of organic matter;

[0003] In existing wastewater treatment technologies, the pretreatment process is often limited to a simple mixing of wastewater and flocculants, followed by stirring to induce precipitation. Although this process can achieve initial purification, it is necessary to manually separate the precipitated impurities from the clean water. The entire treatment process is divided into multiple independent steps, which not only increases the complexity of the operation, but also significantly reduces the efficiency of wastewater treatment. Therefore, how to optimize this process, reduce the disconnection between processes, and improve treatment efficiency has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and propose a lactic acid production wastewater treatment system. During actual use, the treatment system optimizes the actual steps when performing flocculation and sedimentation operations, effectively improves the treatment efficiency, and facilitates the operation of the staff. In addition, the wastewater is deoxygenated to facilitate the subsequent anaerobic reaction.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A lactic acid production wastewater treatment system, comprising a treatment barrel, a support frame is installed at the lower end of the treatment barrel, a liquid filling port is opened at the inner top of the treatment barrel, a slag discharge pipe is arranged at the inner bottom of the treatment barrel, and manual valves are installed in the liquid filling port and the slag discharge pipe; a mixing mechanism, the mixing mechanism comprises a rotating shaft rotatably connected to the inner top of the treatment barrel, a plurality of stirring rods are installed on the outer side of the rotating shaft, a driving motor is on the left inner wall of the treatment barrel, the driving motor is a double-shaft motor, the right output shaft of the driving motor extends to the inside of the treatment barrel and is installed with a first bevel gear, a second bevel gear is installed on the rotating shaft, and the first bevel gear and the second bevel gear are meshed; an air pressure regulating mechanism, the air pressure regulating mechanism is used to reduce the oxygen content in the wastewater; a gas stirring mechanism, the gas stirring mechanism cooperates with the mixing mechanism to improve the reaction effect of the wastewater and the flocculant; a liquid discharge mechanism, the liquid discharge mechanism is used to separate the solid and liquid of the treated wastewater and discharge it.

[0007] Preferably, the air pressure regulating mechanism includes a U-shaped plate fixedly connected to the left side of the processing cylinder, the lower end of the upper horizontal part of the U-shaped plate is fixedly connected to the first piston cylinder, the upper end of the lower horizontal part of the U-shaped plate is fixedly connected to the second piston cylinder, the left output shaft of the drive motor is fixedly connected to a rotating disk, the left eccentric part of the rotating disk is rotatably connected to a connecting shaft, and the other end of the connecting shaft is rotatably connected to the lower end of the first piston plate.

[0008] Preferably, a third piston cylinder is fixedly connected to the right side of the treatment cylinder, a piston column which can slide left and right is arranged in the third piston cylinder, the left side of the piston column is elastically connected to the left inner wall of the third piston cylinder through a first spring, the top of the left space of the third piston cylinder is connected with the outside through a first vent, the right side space of the third piston cylinder is connected with a through port, the inner top space of the first piston cylinder is connected with the inner top space of the treatment cylinder through a third one-way tube, the inner top space of the first piston cylinder is connected with a second one-way tube, the other end of the second one-way tube is connected with a second oxygen removal cylinder, the other side of the second oxygen removal cylinder is connected with a second connecting tube, and the other end of the second connecting tube is connected with the right side space of the third piston cylinder.

[0009] Preferably, the third one-way tube and the second one-way tube are both equipped with a second one-way valve, the flow direction of the second one-way valve of the third one-way tube is from right to left, and the flow direction of the second one-way valve in the second one-way tube is from the top space in the first piston cylinder to the interior of the second oxygen removal cylinder in one direction.

[0010] Preferably, the gas agitation mechanism includes a hollow ring installed on the inner wall of the bottom space of the processing cylinder, and a plurality of exhaust holes are provided on the inner wall of the hollow ring. An installation port is provided at the bottom of the middle space of the third piston cylinder, and a gas injection pipe is installed in the installation port. The other end of the gas injection pipe is connected to the interior of the hollow ring, and a check valve is installed in the gas injection pipe.

[0011] Preferably, the liquid injection mechanism includes a high-pressure gas storage cylinder fixedly connected to the upper end of the support frame, a third piston plate which can slide up and down is arranged in the high-pressure gas storage cylinder, the upper end of the third piston plate is elastically connected to the inner top of the high-pressure gas storage cylinder through a second spring, a second vent is opened in the inner top of the high-pressure gas storage cylinder, a second piston plate which can slide up and down is arranged in the second piston cylinder, the second piston plate is fixedly connected to the first piston plate through a connecting rod, the one-way port of the bottom space in the second piston cylinder is connected to the outside, the inner bottom space of the second piston cylinder is connected to a first one-way tube, the other end of the first one-way tube is connected to a first oxygen removal cylinder, the other end of the first oxygen removal cylinder is connected to a first connecting tube, the other end of the first connecting tube is connected to the inner bottom space of the high-pressure gas storage cylinder, and the inner bottom space of the high-pressure gas storage cylinder is connected to the inner top space of the treatment cylinder through a connecting tube.

[0012] Preferably, a first one-way valve is installed in both the first one-way tube and the one-way port. The flow direction of the first one-way valve in the first one-way tube is to flow from the bottom space in the second piston cylinder into the first oxygen removal cylinder in one direction. The flow direction of the first one-way valve in the one-way port is from bottom to top.

[0013] Preferably, a guide rod is fixedly connected between the upper and lower inner walls of the processing cylinder, a hollow float block is penetrated by the guide rod, a liquid suction port is opened on the left side wall of the hollow float block, the interior of the hollow float block is connected with a soft tube, the other end of the soft tube penetrates the front inner wall of the processing cylinder and is connected with a drain pipe, and the drain pipe, connecting pipe and through port are all equipped with normally open solenoid valves.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. A mixing mechanism is provided to cooperate with a gas stirring mechanism. When the flocculant solution and wastewater are stirred and reacted, the treatment effect is better and the treatment efficiency is faster.

[0016] 2. In actual use, the gas agitation mechanism can also keep the inside of the treatment cylinder in a low-pressure state. As the gas solubility decreases with the pressure, the low pressure will cause the dissolved oxygen in the water to escape, and the overflowing gas will remove the oxygen when passing through the second oxygen removal cylinder, and finally be recycled and injected, thus achieving the deoxygenation treatment of the wastewater, making the subsequent anaerobic reaction faster and improving the efficiency of the subsequent anaerobic treatment.

[0017] 3. A hollow ring and multiple exhaust holes are provided. The exhaust holes discharge gas continuously and evenly. The bubbles generated by the gas will float up evenly, making the gas stirring and mixing effect better.

[0018] 4. After the drive motor is started, the gas will continue to be stored. When it is released later, the use of hollow floating blocks can allow the liquid to automatically separate and discharge from the sediment layer at the bottom. Compared with the existing technology, the operation steps are optimized and the operation of the staff is convenient.

[0019] The equipment achieves efficient flocculation reaction and wastewater deoxygenation treatment through the synergistic effect of the mixing mechanism and the gas stirring mechanism. At the same time, it uses hollow rings and exhaust holes to optimize gas distribution, combines with automatic gas storage and release mechanisms, simplifies operation and promotes sedimentation and separation, thereby improving the overall efficiency and effectiveness of wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a lactic acid production wastewater treatment system proposed by the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the rear side;

[0022] Figure 3 for Figure 1 A cross-sectional view of

[0023] Figure 4 for Figure 3 A bottom view of the third piston cylinder;

[0024] Figure 5 for Figure 3 A cross-sectional view of

[0025] Figure 6 for Figure 5 A schematic diagram of the structure is enlarged at the U-shaped plate;

[0026] Figure 7 for Figure 2 Schematic diagram of a partial cross section.

[0027] In the figure: 1 treatment cylinder, 2 support frame, 3 U-shaped plate, 4 driving motor, 5 first piston cylinder, 6 first one-way tube, 7 second piston cylinder, 8 first oxygen removal cylinder, 9 first connecting pipe, 10 second one-way tube, 11 second oxygen removal cylinder, 12 second connecting pipe, 13 third piston cylinder, 14 liquid discharge pipe, 15 liquid adding port, 16 high pressure gas storage cylinder, 17 connecting pipe, 18 port, 19 piston column, 20 first spring, 21 first vent, 22 rotating shaft, 23 stirring rod, 24 second bevel gear, 25 first bevel gear, 26 slag discharge pipe, 27 hollow ring, 28 exhaust hole, 29 guide rod, 30 hollow floating block, 31 liquid suction port, 32 soft pipe, 33 installation port, 34 gas injection pipe, 35 third one-way tube, 36 first piston plate, 37 second piston plate, 38 one-way port, 39 rotating disk, 40 connecting shaft, 41 connecting rod, 42 third piston plate, 43 second spring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] Reference Figure 1-Figure 7 A lactic acid production wastewater treatment system includes a treatment barrel 1, a support frame 2 is installed at the lower end of the treatment barrel 1, a liquid addition port 15 is opened at the inner top of the treatment barrel 1, a slag discharge pipe 26 is arranged at the inner bottom of the treatment barrel 1, and manual valves are installed in the liquid addition port 15 and the slag discharge pipe 26;

[0030] As an embodiment of the present invention, a mixing mechanism includes a rotating shaft 22 rotatably connected to the inner top of the processing cylinder 1, a plurality of stirring rods 23 are installed on the outer side of the rotating shaft 22, a driving motor 4 is installed on the left inner wall of the processing cylinder 1, the driving motor 4 is a double-shaft motor, the right output shaft of the driving motor 4 extends to the inside of the processing cylinder 1, and a first bevel gear 25 is installed, and a second bevel gear 24 is installed on the rotating shaft 22, and the first bevel gear 25 and the second bevel gear 24 are meshed;

[0031] As an embodiment of the present invention, an air pressure regulating mechanism is used to reduce the oxygen content in the wastewater. The air pressure regulating mechanism includes a U-shaped plate 3 fixedly connected to the left side of the treatment cylinder 1, the lower end of the upper horizontal part of the U-shaped plate 3 is fixedly connected to the first piston cylinder 5, the upper end of the lower horizontal part of the U-shaped plate 3 is fixedly connected to the second piston cylinder 7, the left output shaft of the drive motor 4 is fixedly connected to the rotating disk 39, the left eccentric part of the rotating disk 39 is rotatably connected to the connecting shaft 40, the other end of the connecting shaft 40 is rotatably connected to the lower end of the first piston plate 36, the right side of the treatment cylinder 1 is fixedly connected to the third piston cylinder 13, the third piston cylinder 13 is provided with a piston column 19 that can slide left and right, and the left side of the piston column 19 is elastically connected to the left inner wall of the third piston cylinder 13 through the first spring 20;

[0032] As an embodiment of the present invention, the top of the left side space of the third piston cylinder 13 is connected to the outside through the first vent 21, the right side space of the third piston cylinder 13 is connected with the through port 18, the top inner space of the first piston cylinder 5 is connected with the top inner space of the treatment cylinder 1 through the third one-way tube 35, the top inner space of the first piston cylinder 5 is connected with the second one-way tube 10, the other end of the second one-way tube 10 is connected with the second oxygen removal cylinder 11, the other side of the second oxygen removal cylinder 11 is connected with the second connecting tube 12, the other end of the second connecting tube 12 is connected with the third piston cylinder 1 3 is connected, the third one-way tube 35 and the second one-way tube 10 are both equipped with a second one-way valve, the second one-way valve of the third one-way tube 35 flows from right to left, and the second one-way valve in the second one-way tube 10 flows from the top space in the first piston cylinder 5 to the second oxygen removal cylinder 11 in one direction, the first oxygen removal cylinder 8 and the second oxygen removal cylinder 11 are both cylinder structures with deoxidizer installed inside, that is, two mesh bodies are symmetrically installed on the inner wall of the cylinder, and the space between the two mesh bodies is filled with deoxidizer, and the amount of deoxidizer will not completely cover the mesh gap to ensure the overall flow;

[0033] As an embodiment of the present invention, a gas stirring mechanism is used to improve the reaction effect of wastewater and flocculant by cooperating with a mixing mechanism. The gas stirring mechanism includes a hollow ring 27 installed on the inner wall of the bottom space in the treatment cylinder 1, and a plurality of exhaust holes 28 are provided on the inner wall of the hollow ring 27. A mounting port 33 is provided at the bottom of the middle space of the third piston cylinder 13, and a gas injection pipe 34 is installed in the mounting port 33. The other end of the gas injection pipe 34 is connected to the inside of the hollow ring 27. In the initial state, the mounting port 33 is sealed by the piston column 19, and a check valve is installed in the gas injection pipe 34. The use of the check valve can avoid the occurrence of liquid reflux.

[0034] As an embodiment of the present invention, a liquid discharge mechanism is used to separate and discharge the treated wastewater into solid and liquid. The liquid injection mechanism includes a high-pressure gas storage cylinder 16 fixedly connected to the upper end of the support frame 2. A third piston plate 42 that can slide up and down is provided in the high-pressure gas storage cylinder 16. The upper end of the third piston plate 42 is elastically connected to the inner top of the high-pressure gas storage cylinder 16 through a second spring 43. A second vent is provided at the inner top of the high-pressure gas storage cylinder 16. A second piston plate 37 that can slide up and down is provided in the second piston cylinder 7. The second piston plate 37 is fixedly connected to the first piston plate 36 through a connecting rod 41. The one-way port in the bottom space of the second piston cylinder 7 38 is connected to the outside, the inner bottom space of the second piston cylinder 7 is connected to the first one-way tube 6, the other end of the first one-way tube 6 is connected to the first oxygen removal cylinder 8, the other end of the first oxygen removal cylinder 8 is connected to the first connecting tube 9, the other end of the first connecting tube 9 is connected to the inner bottom space of the high-pressure gas storage cylinder 16, the inner bottom space of the high-pressure gas storage cylinder 16 is connected to the inner top space of the treatment cylinder 1 through the connecting tube 17, the first one-way tube 6 and the one-way port 38 are both installed with a first one-way valve, the first one-way valve in the first one-way tube 6 flows in a one-way direction from the inner bottom space of the second piston cylinder 7 to the inside of the first oxygen removal cylinder 8, and the first one-way valve in the one-way port 38 flows from bottom to top;

[0035] As an embodiment of the present invention, a guide rod 29 is fixedly connected between the upper and lower inner walls of the treatment tube 1, and a hollow floating block 30 is penetrated on the guide rod 29. A liquid suction port 31 is opened on the left wall of the hollow floating block 30. In addition, the inner cavity of the hollow floating block 30 is small, and when the guide rod 29 penetrates the hollow floating block 30, it does not penetrate its inner cavity. The density of the hollow floating block 30 is slightly lower than the density of the water body. Under normal conditions, the hollow floating block 30 can be suspended on the surface of the wastewater, and the liquid suction port 31 is just located at Inside the water body, the interior of the hollow floating block 30 is connected with a soft tube 32. It should be noted here that the stirring rod 23 can be set to be shorter, so as to avoid the interference between the rotation of the stirring rod 23 and the soft tube 32. The other end of the soft tube 32 passes through the front inner wall of the treatment tube 1 and is connected with the drain pipe 14. The drain pipe 14, the connecting pipe 17 and the through port 18 are all equipped with normally open solenoid valves. The normally open solenoid valve is started together with the drive motor 4 and will be closed five minutes after the drive motor 4 is powered off.

[0036] In the present invention, in the treatment system, wastewater after filtering out large impurities is added through the liquid filling port 15, and then an appropriate amount of flocculant solution is added. The final liquid level is located at three quarters of the treatment cylinder 1. At the same time, the manual valve of the liquid filling port 15 is sealed, and then the drive motor 4 is started. After the drive motor 4 is started (a plurality of normally open solenoid valves are powered on and closed, and the drain pipe 14, the connecting pipe 17 and the through port 18 are all sealed), the shaft 22 is rotated through the transmission of the first bevel gear 25 and the second bevel gear 24. The rotation of the shaft 22 drives the plurality of stirring rods 23 to rotate, thereby stirring the water body, allowing the flocculant and the wastewater to fully react and mix. The drive motor 14 The rotation will make the rotating disk 39 rotate, and the rotation of the rotating disk 39 will make the first piston plate 36 reciprocate up and down through the connecting shaft 40. The reciprocating up and down movement of the first piston plate 36 will continuously extract the air in the top space of the treatment cylinder 1 through the cooperation of the two second one-way valves, and then press it into the second oxygen removal cylinder 11, then enter the second connecting pipe 12, and then enter the right side space of the third piston cylinder 13. As the amount of gas in the right side space of the third piston cylinder 13 continues to increase, the piston column 19 will be pushed to move left and the first spring 20 will be compressed. In order to achieve a better negative pressure manufacturing effect, the first spring 20 can use a spring with a larger stiffness coefficient;

[0037] As the above actions proceed, the air in the top of the treatment tube 1 is almost evacuated, leaving the inside of the treatment tube 1 in a low-pressure state. As the gas solubility decreases with decreasing pressure, the low pressure will cause the dissolved oxygen in the water to escape, and the overflowing gas will remove oxygen when passing through the second oxygen removal tube 11;

[0038] When more and more gas is injected into the right side space of the third piston cylinder 13, the piston column 19 will be pushed to move left to the right side surface located at the left side of the gas injection pipe 34. As the injection continues, the gas will enter the gas injection pipe 34, enter the hollow ring 27, and precipitate from the exhaust hole 28. In this way, the right side of the third piston cylinder 13 will always be in a high pressure state, while the top space in the treatment cylinder 1 will always be in a low pressure state. Its multiple exhaust holes 28 continuously discharge gas, and the bubbles generated by the gas will float up, further promoting the flow of water, making the mixing effect better and improving the mixing efficiency. After the mixing is completed, the drive motor 4 is turned off. After the drive motor 4 is turned off, the sedimentation operation starts, and the flocculant agglomerates the suspended matter and then settles it to the inner bottom of the treatment cylinder 1;

[0039] In addition, the second piston plate 37 reciprocates up and down, and the external gas is sucked in through the cooperation of the two first one-way valves, and then pressed into the bottom of the high-pressure gas storage cylinder 16. As the gas is injected, the third piston plate 42 will continuously move up and compress the second spring 43. In this solution, the second spring 43 adopts a spring with a larger spring coefficient, and the high-pressure gas storage cylinder 16 has a larger internal volume and can store more gas, so more gas can be stored;

[0040] After five minutes, the precipitation is completed. At this time, the multiple normally open solenoid valves are powered off and turned on, and the drain pipe 14, the connecting pipe 17 and the through port 18 are all turned on. After the drain pipe 14 and the connecting pipe 17 are turned on, the high-pressure gas is quickly released to the inner top space of the treatment tube 1. Since the amount of gas is large, it can completely cover the original negative pressure state, and then the inner top space of the treatment tube 1 is in a high-pressure state. The generated high pressure can press the unprecipitated water at the top into the liquid suction port 31, and then press it into the subsequent anaerobic process through the soft tube 32 and the drain pipe 14. This part of the liquid is a deoxygenated liquid, so that the speed of the subsequent anaerobic reaction is faster, and the efficiency of the subsequent anaerobic treatment is improved;

[0041] As the liquid level continues to move downward, when the hollow floating block 30 moves down to the sedimentation layer, the sedimentation layer has a certain supporting force on the hollow floating block 30, resulting in that after the water level continues to drop, the hollow floating block 30 will not move down any further. Under the combined action of buoyancy and supporting force, the liquid suction port 31 will eventually be exposed to the air, and the wastewater is discharged at this time;

[0042] Finally, the staff opens the slag discharge pipe 26 to discharge the sediment layer at the bottom.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lactic acid production wastewater treatment system, characterized in that: include: A treatment cylinder (1), wherein a support frame (2) is installed at the lower end of the treatment cylinder (1), a liquid filling port (15) is provided at the inner top of the treatment cylinder (1), a slag discharge pipe (26) is provided at the inner bottom of the treatment cylinder (1), and manual valves are installed in the liquid filling port (15) and the slag discharge pipe (26); A mixing mechanism, the mixing mechanism comprising a rotating shaft (22) rotatably connected to the inner top of the processing cylinder (1), a plurality of stirring rods (23) being installed on the outer side of the rotating shaft (22), a driving motor (4) being installed on the left inner wall of the processing cylinder (1), the driving motor (4) being a double-shaft motor, the right output shaft of the driving motor (4) extending into the interior of the processing cylinder (1) and being installed with a first bevel gear (25), a second bevel gear (24) being installed on the rotating shaft (22), the first bevel gear (25) being meshed with the second bevel gear (24); An air pressure regulating mechanism, the air pressure regulating mechanism is used to reduce the oxygen content in the wastewater; A gas stirring mechanism, which cooperates with the mixing mechanism to improve the reaction effect between the wastewater and the flocculant; The liquid discharge mechanism is used to separate the solid and liquid of the treated wastewater and discharge it.

2. A lactic acid production wastewater treatment system according to claim 1, characterized in that: The gas pressure regulating mechanism comprises a U-shaped plate (3) fixedly connected to the left side of the treatment cylinder (1), the lower end of the upper horizontal part of the U-shaped plate (3) is fixedly connected to the first piston cylinder (5), the upper end of the lower horizontal part of the U-shaped plate (3) is fixedly connected to the second piston cylinder (7), the left output shaft of the driving motor (4) is fixedly connected to the rotating disk (39), the left eccentric part of the rotating disk (39) is rotatably connected to a connecting shaft (40), and the other end of the connecting shaft (40) is rotatably connected to the lower end of the first piston plate (36).

3. A lactic acid production wastewater treatment system according to claim 2, characterized in that: The right side of the treatment cylinder (1) is fixedly connected to a third piston cylinder (13), and a piston column (19) that can slide left and right is arranged in the third piston cylinder (13). The left side of the piston column (19) is elastically connected to the left inner wall of the third piston cylinder (13) through a first spring (20). The top of the left space of the third piston cylinder (13) is connected to the outside through a first vent (21). The right side space of the third piston cylinder (13) is connected to a through hole (18). The inner top space of the first piston cylinder (5) is connected to the inner top space of the treatment cylinder (1) through a third one-way tube (35). The inner top space of the first piston cylinder (5) is connected to a second one-way tube (10). The other end of the second one-way tube (10) is connected to a second oxygen removal cylinder (11). The other side of the second oxygen removal cylinder (11) is connected to a second connecting tube (12). The other end of the second connecting tube (12) is connected to the right side space of the third piston cylinder (13).

4. A lactic acid production wastewater treatment system according to claim 3, characterized in that: A second one-way valve is installed inside both the third one-way tube (35) and the second one-way tube (10). The flow direction of the second one-way valve of the third one-way tube (35) is from right to left, and the flow direction of the second one-way valve in the second one-way tube (10) is from the top space in the first piston cylinder (5) to the inside of the second oxygen removal cylinder (11) in one direction.

5. A lactic acid production wastewater treatment system according to claim 3, characterized in that: The gas stirring mechanism comprises a hollow ring (27) installed on the inner wall of the bottom space of the treatment cylinder (1), and a plurality of exhaust holes (28) are provided on the inner wall of the hollow ring (27). A mounting port (33) is provided at the bottom of the middle space of the third piston cylinder (13), and a gas injection pipe (34) is installed in the mounting port (33). The other end of the gas injection pipe (34) is connected to the inside of the hollow ring (27), and a check valve is installed in the gas injection pipe (34).

6. A lactic acid production wastewater treatment system according to claim 3, characterized in that: The liquid injection mechanism comprises a high-pressure gas storage cylinder (16) fixedly connected to the upper end of the support frame (2), a third piston plate (42) which can slide up and down is arranged in the high-pressure gas storage cylinder (16), the upper end of the third piston plate (42) is elastically connected to the inner top of the high-pressure gas storage cylinder (16) through a second spring (43), a second vent is opened in the inner top of the high-pressure gas storage cylinder (16), a second piston plate (37) which can slide up and down is arranged in the second piston cylinder (7), the second piston plate (37) and the first piston plate (36) are connected by a connecting rod (43). 1) is fixedly connected, the one-way port (38) of the inner bottom space of the second piston cylinder (7) is connected to the outside, the inner bottom space of the second piston cylinder (7) is connected to a first one-way tube (6), the other end of the first one-way tube (6) is connected to a first oxygen removal cylinder (8), the other end of the first oxygen removal cylinder (8) is connected to a first connecting tube (9), the other end of the first connecting tube (9) is connected to the inner bottom space of the high-pressure gas storage cylinder (16), and the inner bottom space of the high-pressure gas storage cylinder (16) is connected to the inner top space of the treatment cylinder (1) through a connecting tube (17).

7. A lactic acid production wastewater treatment system according to claim 6, characterized in that: A first one-way valve is installed in both the first one-way tube (6) and the one-way port (38). The flow direction of the first one-way valve in the first one-way tube (6) is to enter the first oxygen removal cylinder (8) from the bottom space in the second piston cylinder (7) in one direction, and the flow direction of the first one-way valve in the one-way port (38) is from bottom to top.

8. A lactic acid production wastewater treatment system according to claim 6, characterized in that: A guide rod (29) is fixedly connected between the upper and lower inner walls of the treatment cylinder (1), a hollow float (30) is penetrated by the guide rod (29), a liquid suction port (31) is provided on the left side wall of the hollow float (30), the interior of the hollow float (30) is connected with a soft tube (32), the other end of the soft tube (32) penetrates the front inner wall of the treatment cylinder (1) and is connected with a liquid discharge pipe (14), and a normally open electromagnetic valve is installed in the liquid discharge pipe (14), the connecting pipe (17) and the through port (18).

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