Organic wastewater biochemical treatment device

Abstract

The application discloses an organic wastewater biochemical treatment device, which comprises a biochemical treatment tank, a biogas cavity is arranged at the upper end of the biochemical treatment tank, a partition plate is arranged between the biogas cavity and the biochemical treatment tank, an exhaust pipe, an ascending pipe and a descending pipe are arranged on the partition plate, and a biogas collecting pipe is arranged at the upper end of the biogas cavity; the water distribution chamber comprises a conical supporting plate arranged at the bottom of the biochemical treatment tank, a fluidized bed is arranged above the supporting plate, a first-stage three-phase separator is arranged above the fluidized bed, a second-stage three-phase separator is arranged above the first-stage three-phase separator, the second-stage three-phase separator and the first-stage three-phase separator form a deep purification reaction zone, a preliminary purification reaction zone is formed between the first-stage three-phase separator and the supporting plate, and a drain pipe is arranged on the biochemical treatment tank above the second-stage three-phase separator. The organic wastewater biochemical treatment device has the advantages of high impact load resistance, excellent mass transfer effect, good wood vinegar biochemical treatment effect and stable operation of the device during the wood vinegar treatment process.

Description

Technical Field

[0001] This invention relates to the field of organic wastewater treatment, and more specifically to a biochemical treatment device for organic wastewater. Background Technology

[0002] A large amount of wood vinegar is generated during the combustion of biomass boilers. Wood vinegar is a highly concentrated organic wastewater, and how to biologically treat it is a technical challenge in this field. Biomass pellets are first carbonized in a carbonization furnace at 260°C for about an hour at a low temperature, causing the wood vinegar to reach a saturated state in the form of water vapor. After cooling in a cooling furnace, it condenses into wood vinegar. The composition of wood vinegar is extremely complex, consisting of a mixture of hundreds of organic compounds. Its specific composition and proportions are highly dependent on the carbonization raw materials (such as pine, fir, and straw), carbonization temperature, heating rate, and reaction time. It mainly contains water and volatile organic compounds, with an approximate proportion of 80% water and 20% organic matter.

[0003] The main methods for treating wood vinegar include physical, chemical, and biochemical methods. Physical methods (such as adsorption and distillation) are costly and difficult to completely remove pollutants; chemical methods (such as oxidation and neutralization) are prone to secondary pollution and have limited effectiveness in removing recalcitrant organic matter; biochemical methods, due to their low cost and environmental friendliness, have become the mainstream approach for wood vinegar treatment. Existing biochemical treatment devices mainly suffer from the following drawbacks:

[0004] 1. The anaerobic treatment unit has poor mass transfer efficiency, low anaerobic bacteria activity, incomplete degradation of macromolecular organic matter, and low treatment load;

[0005] 2. The water distribution effect of the water distributor is fixed at different stages. It is impossible to reasonably set the water distribution capacity according to the strong turbulent mass transfer effect of the return water and the effect of uniform distribution of the newly added wood vinegar. As a result, the existing biological treatment device is not suitable for the biological treatment of wood vinegar. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides an organic wastewater biochemical treatment device for efficient biochemical treatment of wood vinegar.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0008] An organic wastewater biochemical treatment device is provided, which includes a biochemical treatment tank, a biogas chamber at the upper end of the biochemical treatment tank, a partition between the biogas chamber and the biochemical treatment tank, an exhaust pipe, an ascending pipe and a descending pipe on the partition, and a biogas collection pipe at the upper end of the biogas chamber.

[0009] The exhaust pipe extends from the top of the biochemical treatment tank to the middle of the biogas chamber, discharging the biogas produced by the biochemical treatment tank into the biogas chamber; the riser extends from the middle of the biochemical treatment tank to the bottom of the biogas chamber, discharging the organic wastewater in the deep purification reaction zone in the middle of the biochemical treatment tank into the biogas chamber, and keeping the liquid level in the biogas chamber lower than the top of the exhaust pipe; the downcomer extends from the bottom of the biogas chamber to the water distribution chamber set at the bottom of the biochemical treatment tank, and the top of the downcomer is flush with the height of the baffle.

[0010] The water distribution chamber includes a conical support plate installed at the bottom of the biochemical treatment tank. Several through holes are evenly opened on the support plate, and a conical water distribution chamber is formed between the support plate and the ground of the biochemical treatment tank. A downcomer passes through the middle of the support plate and extends into the water distribution chamber to connect with the water distributor. Several water distribution pipes are installed on the circumference of the water distributor. A water inlet branch pipe is installed on the downcomer at the upper end of the support plate and extends to the outside of the biochemical treatment tank.

[0011] A fluidized bed is installed above the support plate. The fluidized bed consists of several sludge particles inoculated with microorganisms that decompose organic matter. A primary three-phase separator is installed above the fluidized bed. A secondary three-phase separator is installed above the primary three-phase separator. The secondary three-phase separator and the primary three-phase separator form a deep purification reaction zone. A preliminary purification reaction zone is formed between the primary three-phase separator and the support plate. A drain pipe is installed on the biochemical treatment tank above the secondary three-phase separator.

[0012] Furthermore, an anti-backflow device is installed on the downcomer above the connection point with the inlet branch pipe. The anti-backflow device is used to prevent the organic wastewater discharged from the inlet branch pipe from being discharged into the biogas chamber through the downcomer, thus avoiding obstructing the return of the upper organic wastewater in the biogas chamber to the water distribution chamber at the bottom of the biochemical treatment tank.

[0013] Furthermore, the anti-backflow device includes an outer shell, with a T-shaped upper cavity at the upper end and a T-shaped lower cavity at the lower end. A connecting piston is provided between the upper and lower cavities, comprising an upper piston located on one side of the upper cavity and a lower piston located on the other side of the lower cavity. The upper and lower pistons are rotatably sealed against the side walls of the outer shell. A mutually communicating channel is provided between the upper and lower pistons, with the channel on the upper piston being misaligned with that on the lower piston. Both the upper and lower pistons are equipped with a liquid vortex power component. When the upper organic wastewater flows back to the distribution chamber through the downcomer, the returning upper organic wastewater pushes the upper and lower pistons to rotate in the direction of channel opening, thus opening the channel. When the organic wastewater discharged from the inlet branch pipe flows into the anti-backflow device, it pushes the upper and lower pistons to rotate in the misaligned direction of the channel, thus closing the channel. Both the upper and lower cavities are equipped with connectors for connecting to the downcomer.

[0014] Furthermore, an upper screw conveyor is provided at the upper end of the upper piston, and a lower screw conveyor is provided at the lower end of the lower piston. The upper and lower screw conveyors are respectively located in the upper and lower cavities and are coaxial with the downcomer. Several arc-shaped guide plates are provided on the surfaces of the upper and lower pistons that are in contact with each other. The guide plates are inserted into several arc-shaped guide grooves opened on the lower piston. The guide plates are sealed and rotated in the guide holes. An upper channel is opened on the guide plate that passes through the upper piston, and a lower channel is opened in the guide groove that passes through the lower piston. The length of the upper channel is less than or equal to half the length of the guide plate, and the length of the lower channel is less than or equal to half the length of the guide groove. When the relative rotation between the upper and lower pistons requires closing the channel, the upper channel on the guide plate rotates to the closed side of the guide groove. When the relative rotation between the upper and lower pistons requires opening the channel, the upper channel on the guide plate rotates to the lower channel side of the guide groove, so that the upper and lower channels are connected.

[0015] Furthermore, sealed bearings are installed on the outer walls of both the upper and lower pistons, and these sealed bearings are installed on the inner wall of the outer casing.

[0016] Furthermore, the water distribution pipe has several uniformly spaced water distribution holes, which are arranged in several rows along the axial direction of the water distribution pipe. Each water distribution hole has an annular air bladder on its inner wall. The air bladders in each row of water distribution holes are connected through the same exhaust channel. Each exhaust channel is connected to an air supply pipe. Several air supply pipes are connected to an air pipe splitter. Each air supply pipe is equipped with a water distribution control valve. The air pipe splitter is connected to an air pump through a main air pipe. The air pump is connected to an air inlet pipe extending to the outside of the biochemical treatment tank. The air pump is installed at the bottom of the water distributor.

[0017] Furthermore, a collar is provided at the upper end of the support plate, which is fitted onto the downcomer tube, and the support plate is configured with a uniformly convex and concave wave structure along the circumference.

[0018] Furthermore, an inlet control valve is installed on the inlet branch pipe.

[0019] The beneficial effects of this invention are as follows: This invention is used for the biochemical treatment of wood vinegar. By equipping it with an internal circulation system and a water distribution system suitable for wood vinegar, different water distribution effects are achieved for the upper layer of wood vinegar and newly added wood vinegar. During biogas production, biogas rises and is discharged into the biogas chamber. The gas pressure formed in the biogas chamber forces the upper layer of wood vinegar to flow back through the downcomer. Since the gas pressure in the biogas chamber varies according to the biogas production, the opening of the water distribution holes and the number of water distribution holes opened on the water distribution pipe can be controlled by the air pump pumping air into the air bladder. This, combined with different gas pressures, causes the returning wood vinegar to generate jet spray, creating strong turbulence in the biochemical treatment tank, enhancing the mass transfer effect, and improving the contact efficiency between anaerobic bacteria and organic matter. When new wood vinegar is discharged from the inlet branch pipe, the opening of the water distribution holes can also be controlled by the air pump and the water distribution control valve to avoid excessive spray force caused by a large amount of wood vinegar entering, which would reduce the residence time of the new wood vinegar in the lower part of the biochemical treatment tank and thus affect the biochemical treatment effect. At the same time, the design of the anti-backflow device can achieve a self-locking anti-backflow effect, preventing new wood vinegar from entering the biogas chamber from the downcomer.

[0020] The organic wastewater biochemical treatment device designed in this invention has strong resistance to shock loads, excellent mass transfer effect, and good biochemical treatment effect on wood vinegar during the treatment process, and can achieve stable operation of the device. Attached Figure Description

[0021] Figure 1 This is a structural diagram of an organic wastewater biochemical treatment device.

[0022] Figure 2 This is a structural diagram of the water distribution pipe.

[0023] Figure 3 This is a structural diagram of an anti-backflow device.

[0024] Figure 4 This is a diagram showing the fit between the upper and lower pistons.

[0025] Figure 5 This is a top view of the lower piston.

[0026] Figure 6 This is a structural diagram of the support plate.

[0027] The components are as follows: 1. Biochemical treatment tank; 2. Preliminary purification reaction zone; 3. First-stage three-phase separator; 4. Deep purification reaction zone; 5. Second-stage three-phase separator; 6. Drainage pipe; 7. Exhaust pipe; 8. Biogas chamber; 9. Biogas collection pipe; 10. Downcomer; 11. Anti-backflow device; 12. Water distribution chamber; 13. Water distributor; 14. Inlet branch pipe; 15. Inlet control valve; 16. Air pump; 17. Air inlet pipe; 18. Main air pipe; 19. Air pipe distributor; 20. Gas delivery pipe; 21. Exhaust channel; 22. Airbag; 23. Water distribution pipe; 24. Water distribution hole; 25. Lower cavity; 26. Lower screw conveyor; 27. Sealed bearing; 28. Upper piston; 29. ​​Lower piston; 30. Upper cavity; 31. Upper screw conveyor; 32. Upper channel; 33. Guide plate; 34. Guide groove; 35. Ascending pipe; 36. Lower channel. Detailed Implementation

[0028] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0029] like Figures 1-6 As shown, an organic wastewater biochemical treatment device includes a biochemical treatment tank. A biogas chamber is located at the upper end of the biochemical treatment tank. A partition is installed between the biogas chamber and the biochemical treatment tank. An exhaust pipe, an ascending pipe, and a descending pipe are installed on the partition. A biogas collection pipe is located at the upper end of the biogas chamber. The descending pipe serves as a return channel for the wood vinegar solution. The ascending pipe discharges the wood vinegar solution from the deep purification reaction zone into the biogas chamber for return. This section of the wood vinegar solution contains the most organic matter-decomposing microorganisms, making it the optimal return solution.

[0030] The exhaust pipe extends from the top of the biochemical treatment tank to the middle of the biogas chamber, discharging the biogas produced by the biochemical treatment tank into the biogas chamber; the riser extends from the middle of the biochemical treatment tank to the bottom of the biogas chamber, discharging the organic wastewater (wood vinegar) in the deep purification reaction zone in the middle of the biochemical treatment tank into the biogas chamber, and keeping the liquid level in the biogas chamber lower than the top of the exhaust pipe; the downcomer extends from the bottom of the biogas chamber to the water distribution chamber set at the bottom of the biochemical treatment tank, and the top of the downcomer is flush with the height of the baffle.

[0031] The water distribution chamber includes a conical support plate located at the bottom of the biochemical treatment tank. Several through holes are evenly distributed on the support plate, forming a conical water distribution chamber between the support plate and the ground of the biochemical treatment tank. A downcomer passes through the middle of the support plate and extends into the water distribution chamber to connect with a water distributor. Several water distribution pipes are arranged on the circumference of the water distributor. A water inlet branch pipe is installed on the downcomer at the upper end of the support plate, and the water inlet branch pipe extends to the outside of the biochemical treatment tank.

[0032] A fluidized bed is installed above the support plate. The fluidized bed consists of several sludge particles inoculated with microorganisms that decompose organic matter. A primary three-phase separator is installed above the fluidized bed. A secondary three-phase separator is installed above the primary three-phase separator. The secondary three-phase separator and the primary three-phase separator form a deep purification reaction zone. A preliminary purification reaction zone is formed between the primary three-phase separator and the support plate. A drain pipe is installed on the biochemical treatment tank above the secondary three-phase separator.

[0033] In this embodiment, an anti-backflow device is installed on the downcomer above the connection point with the water inlet branch pipe. The anti-backflow device is used to prevent the organic wastewater discharged from the water inlet branch pipe from being discharged into the biogas chamber through the downcomer, thus avoiding obstructing the return flow of the upper organic wastewater in the biogas chamber to the water distribution chamber at the bottom of the biochemical treatment tank.

[0034] In this embodiment, the anti-backflow device includes an outer shell. The upper end of the outer shell has a T-shaped upper cavity, and the lower end has a T-shaped lower cavity. A connecting piston is provided between the upper and lower cavities. The connecting piston includes an upper piston located on one side of the upper cavity and a lower piston located on the other side of the lower cavity. The upper and lower pistons are rotatably sealed against the sidewalls of the outer shell. A mutually communicating channel is provided between the upper and lower pistons, and the channel on the upper piston is misaligned with the channel on the lower piston. Both the upper and lower pistons are equipped with a liquid vortex power component. When the upper organic wastewater flows back to the distribution chamber through the downcomer, the returning upper organic wastewater pushes the upper and lower pistons to rotate in the direction of channel opening, thus opening the channel. When organic wastewater discharged from the inlet branch pipe flows into the anti-backflow device, it pushes the upper and lower pistons to rotate in the direction of channel misalignment, thus closing the channel. Both the upper and lower cavities are equipped with connectors for connection to the downcomer.

[0035] In this embodiment, an upper spiral conveyor is provided at the upper end of the upper piston, and a lower spiral conveyor is provided at the lower end of the lower piston. The upper and lower spiral conveyors are respectively located in the upper and lower cavities and are coaxial with the downcomer. Several arc-shaped guide plates are provided on the surfaces of the upper and lower pistons that are in contact with each other. The guide plates are respectively inserted into several arc-shaped guide grooves opened on the lower piston. The guide plates are sealed and rotated in the guide holes. An upper channel is opened on the guide plate that passes through the upper piston, and a lower channel is opened in the guide groove that passes through the lower piston. The length of the upper channel is less than or equal to half the length of the guide plate, and the length of the lower channel is less than or equal to half the length of the guide groove. When the relative rotation between the upper and lower pistons requires closing the channel, the upper channel on the guide plate rotates to the closed side of the guide groove. When the relative rotation between the upper and lower pistons requires opening the channel, the upper channel on the guide plate rotates to the lower channel side of the guide groove, so that the upper and lower channels are connected.

[0036] The rotation directions of the upper and lower screw conveyors need to be set to be opposite to each other to achieve synchronous reverse rotation of the upper and lower pistons.

[0037] In this embodiment, sealed bearings are installed on the outer walls of both the upper and lower pistons, and the sealed bearings are installed on the inner wall of the outer casing.

[0038] In this embodiment, the water distribution pipe has several uniformly spaced water distribution holes, which are arranged in several rows along the axial direction of the water distribution pipe. Each water distribution hole has an annular air bladder on its inner wall. The air bladders in each row of water distribution holes are connected through the same exhaust channel. Each exhaust channel is connected to an air supply pipe. Several air supply pipes are connected to an air pipe splitter. Each air supply pipe is equipped with a water distribution control valve. The air pipe splitter is connected to an air pump through a main air pipe. The air pump is connected to an air inlet pipe extending to the outside of the biochemical treatment tank. The air pump is installed at the bottom of the water distributor.

[0039] In this embodiment, a collar is provided at the upper end of the support plate, and the collar is sleeved on the downcomer tube. The support plate is configured with a uniformly uneven wave structure along the circumference.

[0040] In this embodiment, an inlet control valve is installed on the inlet branch pipe.

[0041] This invention is used for the biochemical treatment of wood vinegar. By equipping it with an internal circulation system and a water distribution system suitable for wood vinegar, different water distribution effects are achieved for the upper layer of wood vinegar and newly added wood vinegar. During biogas production, biogas rises and is discharged into the biogas chamber. The gas pressure generated in the biogas chamber forces the upper layer of wood vinegar to flow back through the downcomer. Since the gas pressure in the biogas chamber varies according to the biogas production, the opening of the water distribution holes and the number of water distribution holes opened on the water distribution pipe can be controlled by an air pump to inflate the air bladder. This, combined with different gas pressures, causes the returning wood vinegar to be jetted, creating strong turbulence in the biochemical treatment tank, enhancing mass transfer, and improving the contact efficiency between anaerobic bacteria and organic matter. When new wood vinegar is discharged from the inlet branch pipe, the opening of the water distribution holes can also be controlled by the air pump and the water distribution control valve to prevent a large influx of wood vinegar from causing excessive jetting force, reducing the residence time of the new wood vinegar in the lower part of the biochemical treatment tank, and thus affecting the biochemical treatment effect. Simultaneously, the design of the anti-backflow device achieves a self-locking anti-backflow effect, preventing new wood vinegar from entering the biogas chamber through the downcomer. High treatment efficiency and thorough pollutant removal: It achieves efficient degradation of organic matter in the wood vinegar, solving the problem of incomplete treatment in existing devices.

[0042] The organic wastewater biochemical treatment device designed in this invention has strong resistance to shock loads, excellent mass transfer effect, and good biochemical treatment effect on wood vinegar during the treatment process, and can achieve stable operation of the device.

Claims

1. A biochemical treatment device for organic wastewater, characterized in that, The device includes a biochemical treatment tank, with a biogas chamber at the upper end of the biochemical treatment tank. A partition is provided between the biogas chamber and the biochemical treatment tank. An exhaust pipe, an ascending pipe, and a descending pipe are provided on the partition. A biogas collection pipe is provided at the upper end of the biogas chamber. The exhaust pipe extends from the top of the biochemical treatment tank to the middle of the biogas chamber, discharging the biogas produced by the biochemical treatment tank into the biogas chamber; the riser extends from the middle of the biochemical treatment tank to the bottom of the biogas chamber, discharging the organic wastewater in the deep purification reaction zone in the middle of the biochemical treatment tank into the biogas chamber, and keeping the liquid level in the biogas chamber lower than the top of the exhaust pipe; the downcomer extends from the bottom of the biogas chamber to the water distribution chamber located at the bottom of the biochemical treatment tank, and the top of the downcomer is flush with the height of the baffle. The water distribution chamber includes a conical support plate located at the bottom of the biochemical treatment tank. The support plate has several through holes evenly distributed on it, and the support plate and the bottom surface of the biochemical treatment tank form a conical water distribution chamber. The downcomer passes through the middle of the support plate and extends into the water distribution chamber to connect with the water distributor. Several water distribution pipes are arranged on the circumference of the water distributor. A water inlet branch pipe is provided on the downcomer at the upper end of the support plate, and the water inlet branch pipe extends to the outside of the biochemical treatment tank. A fluidized bed is arranged above the support plate. The fluidized bed includes a number of sludge particles inoculated with organic matter decomposing microorganisms. A primary three-phase separator is arranged above the fluidized bed. A secondary three-phase separator is arranged above the primary three-phase separator. The secondary three-phase separator and the primary three-phase separator form a deep purification reaction zone. A preliminary purification reaction zone is formed between the primary three-phase separator and the support plate. A drain pipe is arranged on the biochemical treatment tank above the secondary three-phase separator. An anti-backflow device is installed on the downcomer above the connection point of the water inlet branch pipe. The anti-backflow device is used to prevent the organic wastewater discharged into the water inlet branch pipe from being discharged into the biogas chamber through the downcomer, and to avoid obstructing the backflow of the upper organic wastewater in the biogas chamber to the water distribution chamber at the bottom of the biochemical treatment tank. The anti-backflow device includes an outer shell with a T-shaped upper cavity at the upper end and a T-shaped lower cavity at the lower end. A connecting piston is provided between the upper and lower cavities. The connecting piston includes an upper piston located on one side of the upper cavity and a lower piston located on the other side of the lower cavity. The upper and lower pistons are rotatably sealed with the sidewall of the outer shell. A mutually communicating channel is provided between the upper and lower pistons, and the channel on the upper piston is misaligned with the channel on the lower piston. Both the upper and lower pistons are equipped with a liquid vortex power component. When the upper organic wastewater flows back to the distribution chamber through the downcomer, the returning upper organic wastewater pushes the upper and lower pistons to rotate in the direction of channel opening, thus opening the channel. When the organic wastewater discharged from the inlet branch pipe flows into the anti-backflow device, it pushes the upper and lower pistons to rotate in the misaligned direction of the channel, thus closing the channel. Both the upper and lower cavities are equipped with connectors for connecting to the downcomer.

2. The organic wastewater biochemical treatment device according to claim 1, characterized in that, An upper spiral conveyor is provided at the upper end of the upper piston, and a lower spiral conveyor is provided at the lower end of the lower piston. The upper and lower spiral conveyors are respectively located in the upper and lower cavities and are coaxial with the downcomer. Several arc-shaped guide plates are provided on the surfaces of the upper and lower pistons that are in contact with each other. Several guide plates are respectively inserted into several arc-shaped guide grooves opened on the lower piston. The guide plates are sealed and rotated in the guide grooves. An upper channel is opened on the guide plate that penetrates the upper piston, and a lower channel is opened in the guide groove that penetrates the lower piston. The length of the upper channel is less than or equal to half the length of the guide plate, and the length of the lower channel is less than or equal to half the length of the guide groove. When the relative rotation between the upper and lower pistons requires closing the channel, the upper channel on the guide plate rotates to the closed side of the guide groove. When the relative rotation between the upper and lower pistons requires opening the channel, the upper channel on the guide plate rotates to the lower channel side of the guide groove, so that the upper and lower channels are connected.

3. The organic wastewater biochemical treatment device according to claim 2, characterized in that, Both the upper and lower pistons are fitted with sealed bearings on their outer walls, and the sealed bearings are installed on the inner wall of the outer casing.

4. The organic wastewater biochemical treatment device according to claim 1, characterized in that, The water distribution pipe has several uniformly spaced water distribution holes, which are arranged in several rows along the axial direction of the water distribution pipe. Each water distribution hole has an annular air bladder on its inner wall. The air bladders in each row of water distribution holes are connected through the same exhaust channel. Each exhaust channel is connected to an air supply pipe. The air supply pipes are connected to an air pipe splitter. Each air supply pipe is equipped with a water distribution control valve. The air pipe splitter is connected to an air pump through a main air pipe. The air pump is connected to an air inlet pipe extending to the outside of the biochemical treatment tank. The air pump is installed at the bottom of the water distributor.

5. The organic wastewater biochemical treatment device according to claim 1, characterized in that, The upper end of the support plate is provided with a collar, which is sleeved on the downcomer tube. The support plate is configured with a uniformly convex and concave wave structure along the circumference.

6. The organic wastewater biochemical treatment device according to claim 1, characterized in that, The water inlet branch pipe is equipped with a water inlet control valve.

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