Multi-stage spiral symmetric ozone oxidation device

Abstract

The present invention discloses a multi-stage spiral symmetric ozone oxidation device in the field of wastewater treatment, comprising: a tank body, which is divided into a primary reaction zone and a secondary reaction zone; a primary ozone aeration head, which is arranged at the bottom of the primary reaction zone; a primary water inlet pipe, which extends into the tank body along the tangential direction from both sides of the stainless steel tank body; a secondary ozone aeration head, which is arranged at the bottom of the secondary reaction zone; a secondary water inlet pipe, which extends into the tank body along the tangential direction from both sides of the stainless steel tank body; a water outlet pipe, which is divided into two paths, one path is connected to the water outlet, and the other path is connected to the secondary water inlet pipe in a reflux manner; an exhaust pipe, which is divided into two paths, one path is connected to the gas outlet, and the other path is connected to the secondary ozone aeration head in a reflux manner; four sieve plates, two of which are arranged in the primary reaction zone and the other two are arranged in the secondary reaction zone; and catalytic fillers, which are arranged between the two sieve plates in the primary reaction zone and the secondary reaction zone. The present invention solves the problems of low ozone utilization rate and poor gas-liquid mass transfer effect in the prior art, and improves the catalytic reaction efficiency.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and particularly to a wastewater ozone oxidation treatment device. Background Art

[0002] With the rapid development of industry, the discharge of industrial wastewater is increasing day by day, and the composition is more complex. The water contains many organic compounds that are difficult to degrade, such as phenolic compounds, polycyclic aromatic hydrocarbon compounds, heterocyclic compounds, polychlorinated biphenyls and other compounds, which exacerbate the pollution of natural water bodies, seriously threaten people's health, and restrict the development of social economy and technology. These industrial wastewaters include pharmaceutical wastewater, coal chemical wastewater, pulp-making wastewater, oil-refining wastewater, etc., which have the characteristics of high biological toxicity, containing bacteriostatic substances and low biodegradability, resulting in the inactivation of traditional biological treatment methods. Therefore, it is urgent to develop new water treatment technologies.

[0003] The existing advanced wastewater treatment technologies mainly include activated carbon adsorption, Fenton oxidation, electrocatalytic oxidation, and membrane separation technology, etc., but there are application bottlenecks to varying degrees. The activated carbon adsorption process has a high operating cost, is easy to adsorb to saturation and difficult to desorb, and is easily identified as hazardous waste after use; the treatment effect of the Fenton oxidation technology is unstable, and the amount of iron sludge is large; the electrocatalytic oxidation technology has a large one-time investment, fast consumption of the electrode plate, and high operating cost; the membrane separation technology has a large investment, high operating cost, and the membrane method concentrated water generated is difficult to treat, and there are also relatively large defects.

[0004] Ozone catalytic oxidation technology is an efficient advanced wastewater treatment technology. Compared with other advanced treatment technologies, ozone catalytic oxidation technology is relatively mature in application and has a good treatment effect. Ozone has the advantages of strong oxidation ability (second only to fluorine, ·OH), fast reaction speed, no sludge and secondary pollution, and can improve the biodegradability of water, etc., and its application in wastewater treatment has been paid more and more attention.

[0005] While ozone catalytic oxidation technology is widely used, there are also certain defects and deficiencies. For example, the existing ozone catalytic oxidation devices generally have the phenomena of low ozone utilization rate and poor gas-liquid mass transfer effect. Therefore, it is necessary to optimize the existing ozone catalytic oxidation devices to improve the catalytic reaction efficiency and strengthen the treatment effect. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a multi-stage spiral symmetric ozone oxidation device, which solves the problems of low ozone utilization rate and poor gas-liquid mass transfer effect in the prior art, improves the catalytic reaction efficiency, and enhances the wastewater treatment effect.

[0007] The object of the present invention is achieved as follows: A multi-stage spiral symmetric ozone oxidation device, comprising:

[0008] The stainless - steel tank body, as the reaction main body, is internally divided into a primary reaction zone and a secondary reaction zone. The primary reaction zone is arranged below the secondary reaction zone, and a load - bearing bracket is fixed at the bottom.

[0009] The primary ozone aeration head is arranged at the bottom of the primary reaction zone.

[0010] There are two primary inlet pipes, which extend into the tank body along the tangential direction from both sides of the stainless - steel tank body.

[0011] The secondary ozone aeration head is arranged at the bottom of the secondary reaction zone.

[0012] There are two secondary inlet pipes, which extend into the tank body along the tangential direction from both sides of the stainless - steel tank body.

[0013] There are two outlet pipes, which are connected to the top of the tank body and are divided into two paths. One path is connected to the water outlet, and the other path is connected to the secondary inlet pipe in a reflux manner.

[0014] The exhaust pipe is divided into two paths. One path is connected to the gas outlet, and the other path is connected to the secondary ozone aeration head in a reflux manner.

[0015] There are four sieve plates, two of which are arranged in the primary reaction zone and the other two are arranged in the secondary reaction zone.

[0016] The catalytic packing is arranged between the two sieve plates in the primary reaction zone and the secondary reaction zone.

[0017] The working principle of the present invention is as follows:

[0018] The wastewater is fed into the tank body through two inlet pipes. Due to the tangential relationship, the wastewater entering the pipes will form a swirl in the tank body. As the water continuously enters, the liquid level in the reactor continuously rises, making the wastewater in the entire reaction zone flow upward in a spiral state. At the same time, ozone is introduced through the primary ozone aeration head and evenly rises under the action of the sieve plate, realizing full agitation, mixing, collision, and contact of ozone, catalytic packing, and wastewater in the primary reaction zone. As the liquid level rises, the wastewater enters the secondary reaction zone, and similarly, a reaction is carried out again. Different from the primary reaction zone, in the secondary reaction zone, a part of the ozone and wastewater will flow back through the outlet pipe and the exhaust pipe and react again in a cycle.

[0019] In the present invention, the wastewater enters tangentially through two inlet pipes, so that the wastewater generates a swirl in the tank body, enabling ozone and catalytic packing to fully contact during the agitation process, effectively solving the problem of dead - angle areas existing in the existing reaction, and further solving the problems of low ozone utilization rate and poor gas - liquid mass transfer effect. At the same time, such a structure eliminates the need for external agitation and simplifies the structure.

[0020] The present invention restricts the catalytic packing within a certain area through the designed partition plate, solving the problem that the existing packing is easily washed away. At the same time, it also reduces the suspension speed of the water body, ensures the contact time between the water body and ozone and the catalytic packing within a certain area, realizes sufficient reaction, and further solves the problems of low ozone utilization rate and poor gas-liquid mass transfer effect.

[0021] The present invention is designed into a two-stage reaction area. The first-stage reaction area serves as the main reaction area, which can oxidize and degrade most of the organic pollutants in the sewage; the second-stage reaction area serves as the circulating reaction area. The remaining ozone and the treated water discharged from the tank are partially returned to the second-stage reaction area, prolonging the contact time between the wastewater and ozone and the catalytic packing, thereby solving the problems of low ozone utilization rate and poor gas-liquid mass transfer effect in the prior art.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The present invention is designed to make the wastewater enter the tank diagonally in parallel, which can quickly form a rotating fluid in the treatment area and stir the packing, enabling the full contact of ozone, wastewater, and catalytic packing. Compared with the traditional side-flow water inlet method, it can more effectively reduce the dead corners in the device, increase the contact time and contact area of ozone, wastewater, and catalytic packing, improve the catalytic oxidation efficiency of the system, and save energy without other stirring equipment.

[0024] The present invention designs a secondary circulation treatment system. By partially refluxing the discharged water and gas to the circulating reaction area, it further oxidizes the organic pollutants in the sewage and improves the utilization efficiency of ozone.

[0025] As a further improvement of the present invention, the catalytic packing is made of an aluminum-silicon composite material, and the catalytic packing is in the structure of a polyhedral hollow sphere. First of all, the aluminum-silicon composite material has better catalytic effect, high mechanical strength, and strong resistance to adverse environments. Secondly, due to its multiple blades, the polyhedral hollow sphere structure has a large specific surface area, which increases the contact area between the catalyst and wastewater and ozone, further solves the problem of low ozone utilization rate, and improves the contact efficiency between ozone and wastewater. In addition, the gas flow rate inside the traditional activated carbon spherical structure is relatively low, and the hollow polyhedral hollow sphere structure speeds up the ozone flow rate and improves the exchange efficiency.

[0026] As a further improvement of the present invention, a hollow balloon is provided at the center of the catalytic filler, and the sieve plates in the upper middle part of the first reaction zone and the upper middle part of the second reaction zone are both processed into spherical structures. In the actual application process, since the catalytic filler is made of an aluminum-silicon composite material, its density is slightly greater than that of the wastewater. During the rotation of the water body, because the traditional ozone catalytic filler is relatively distributed in the area near the inner wall of the tank body, a series of problems will occur, such as the wastewater in the central area cannot be fully contacted with the filler, and the catalytic material cannot fully carry out catalytic reaction with ozone gas. By setting a hollow balloon at the center of the polyhedral hollow sphere structure in the present invention, the buoyancy of the catalytic filler is enhanced, so that the catalytic filler can gather at the top of the reaction zone. At the same time, by processing the sieve plate in the upper part of the reaction zone into an arc spherical structure, under the action of the enhanced buoyancy, a part of the catalytic filler will slide to the center of the sieve plate, making the distribution of the catalytic filler more uniform, thus solving the problem of uneven distribution of the existing catalytic filler, ensuring the full contact between the wastewater in the reaction area and the filler, and making the reaction more sufficient.

[0027] As a further improvement of the present invention, a number of diamond-shaped through holes are processed on the first sieve plate, the second sieve plate, the third sieve plate, and the fourth sieve plate. The diamond-shaped through holes are made by stamping, with simple process and relatively high mechanical strength.

[0028] As a further improvement of the present invention, pressure devices are provided at the inlets of the first water inlet pipe, the second water inlet pipe, the first ozone aeration head, and the second ozone aeration head. By designing the pressure device, the flow rate can be enhanced to ensure the reaction effect.

[0029] As a further improvement of the present invention, a two-phase separator is provided at the inlet of the exhaust pipe. The design of the two-phase separator can contribute to the discharge and circulation of ozone. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of the present invention.

[0032] Figure 2 For Figure 1 the sectional view taken along the A-A direction in

[0033] Figure 3 For Figure 1 the sectional view taken along the B-B direction in

[0034] Figure 4This is a schematic diagram of the catalytic filler structure in the present invention.

[0035] Among them, 1 is the tank body, 1a is the primary reaction zone, 1b is the secondary reaction zone, 2 is the load-bearing bracket, 3 is the primary ozone aeration head, 4 is the primary water inlet pipe, 5 is the secondary ozone aeration head, 6 is the secondary water inlet pipe, 7 is the outlet pipe, 8 is the exhaust pipe, 9 is the sieve plate, 10 is the catalytic filler, 11 is the hollow balloon, and 12 is the two-phase separator. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1

[0038] As Figures 1-4 shown, a multi-stage spiral symmetric ozone oxidation device includes:

[0039] A stainless steel tank body 1, as the reaction main body, is internally divided into a primary reaction zone 1a and a secondary reaction zone 1b. The primary reaction zone 1a is arranged below the secondary reaction zone 1b, and a load-bearing bracket 2 is fixed at the bottom and fixed on the ground through the load-bearing bracket 2;

[0040] The primary reaction zone 1a is surrounded by two partition plates. Below the lower partition plate, a primary ozone aeration head 3 is arranged. The primary aeration head is connected to an external ozone gas source and is pressurized by a gas pump at the same time. Above the lower partition plate, a primary water inlet pipe 4 is arranged. There are two primary water inlet pipes 4, which extend into the tank body 1 along the tangential direction from both sides of the stainless steel tank body 1. A water pump is provided at the inlet of the primary water inlet pipe 4 and is connected to a waste water source;

[0041] The secondary reaction zone 1b is also surrounded by two partition plates. Below the lower partition plate, a secondary ozone aeration head 5 is arranged. The secondary aeration head is connected to the exhaust pipe 8 beside it and is pressurized by a gas pump at the same time. Above the lower partition plate, a secondary water inlet pipe 6 is arranged. There are two secondary water inlet pipes 6, which extend into the tank body 1 along the tangential direction from both sides of the stainless steel tank body 1. The secondary water inlet pipe 6 is connected to the outlet pipe 7 beside it;

[0042] The exhaust pipe 8 extends into the tank body 1 from the top. A two-phase separator 12 is provided at the inlet of the exhaust pipe 8, which is divided into two paths. One path is connected to the air outlet, and the other path is refluxed and connected to the secondary ozone aeration head 5;

[0043] The catalytic packing 10 is arranged between two sieve plates 9 in the primary reaction zone 1a and the secondary reaction zone 1b. The catalytic packing 10 is made of an aluminum-silicon composite material and has a polyhedral hollow sphere structure. A hollow balloon 11 is provided at the center of the catalytic packing 10. The sieve plates 9 in the upper middle part of the primary reaction zone 1a and the sieve plates 9 in the upper middle part of the secondary reaction zone 1b are both processed into spherical structures.

[0044] In this embodiment, the tank body 1 is made of 316L stainless steel with a thickness of 3 - 5 mm to enhance the anti-oxidation and corrosion resistance capabilities. A load-bearing bracket 2 is welded at the bottom to keep the device stable.

[0045] Ozone enters the device through an ozone generator at a pressure of 0.8 - 1.2 MPa and enters the primary reaction zone 1a through the sieve plate 9. The sieve plate 9 has diamond-shaped holes with a hole size of 8 - 12 mm. The wastewater is pressurized by a water pump and enters the treatment area in parallel along the diagonal of the pipeline.

[0046] During operation, the wastewater pressurized by the water pump and entering the pipeline will form a swirl in the device. As the water continuously enters, the liquid level in the reactor continuously rises, causing the wastewater in the entire reaction zone to flow upward in a spiral state, which can fully agitate and mix the ozone, catalytic packing 10, and wastewater in the reaction zone, and make them collide and contact.

[0047] The ozone catalyst packing is made of an aluminum-silicon composite material. The composite material carrier further strengthens the carrier strength, has low wear and tear, and high mechanical strength. The high strength of the catalyst carrier enables the catalytic components not to be lost or replaced, and ensures stable and efficient long-term operation. Its shape is a hollow polyhedral spherical shape with a diameter of 25 mm, and it has the advantages of high gas velocity, many vanes, small resistance, and large specific surface area.

[0048] In the primary reaction zone 1a, the ozone and the catalytic packing 10 are in full contact during the water flow agitation process and quickly undergo an oxidation reaction with the organic pollutants in the sewage, reducing the concentration of the organic pollutants in the water, thereby achieving the effect of advanced wastewater treatment. It can effectively solve the dead zone in the device and reduce the head loss. At the same time, by directly injecting water under pressure from the bottom with a lift pump, mechanical external stirring is not required, simplifying the device.

[0049] The catalytic packing 10 is separated by the sieve plate 9 to prevent the catalytic packing 10 from being washed away by the water flow. The interior of the device is divided into a primary reaction zone 1a and a secondary reaction zone 1b. The baffles and the sieve plate 9 are used to reduce the swirling speed of the water body. A two-phase separator 12 is designed at the top of the device. The treated sewage is discharged to the outlet pipe 7 through the overflow weir. Part of it undergoes subsequent biochemical treatment, and part of it continues to enter the secondary reaction zone 1b through water pump boosting; the unused ozone tail gas is collected through the two-phase separator 12. Part of the tail gas is discharged without pollution after passing through the ozone destructor, and the other part is boosted and enters the secondary reaction zone 1b for aeration to improve the utilization efficiency of ozone. The secondary reaction zone 1b adopts a spiral symmetric water distribution method, enabling the ozone, catalytic packing 10, and wastewater to be in full contact, thereby improving the treatment efficiency of the system.

[0050] The multi-stage spiral symmetric ozone oxidation device has a primary reaction zone 1a, which can oxidize and degrade most of the organic pollutants in the sewage; a secondary reaction zone 1b. The remaining ozone and the treated water discharged from the device are partially pressurized and recycled to the secondary reaction zone 1b, further improving the treatment efficiency of the organic pollutants in the wastewater and increasing the utilization efficiency of ozone. Both the primary reaction zone 1a and the secondary reaction zone 1b adopt a spiral symmetric water distribution method, which can effectively promote the contact time between ozone, wastewater, and the catalytic packing 10, and improve the oxidation efficiency of ozone.

[0051] The reacted gas and wastewater enter the secondary reaction zone 1b to continue oxidation. After the swirling water body slows down through the baffles and the sieve plate 9, gas-liquid separation is carried out through the two-phase separator 12. The wastewater passes through the overflow weir. Part of it enters the secondary reaction zone 1b after being pressurized in the outlet water return pipeline, and part of it is discharged through the wastewater outlet pipe 7. After the remaining ozone is collected through the ozone collection pipeline, part of it enters the secondary reaction zone 1b for re-aeration through circulation, and part of the ozone is discharged through the exhaust pipe 8 and is safely discharged after being treated by the ozone destructor.

[0052] Example 2:

[0053] This example provides a practical experimental example of the application of the above multi-stage spiral symmetric ozone oxidation device in sewage treatment:

[0054] Wastewater treatment process of a refinery in Linyi, Shandong: An ozone advanced treatment device is designed after the sedimentation tank. After the wastewater is oxidized by ozone, the effluent is sent to the secondary biochemical tank for biological treatment. After treatment, it meets the discharge standards. After the wastewater of the refinery is treated by the original process, the COD concentration of the effluent is about 100 mg / L. Now it is required that the effluent should reach below 50 mg / L before it can be discharged. Therefore, advanced treatment is needed. After ozone advanced treatment, the influent COD concentration is 92 - 120 mg / L within 60 days, with an average concentration of 105.6 mg / L, and the effluent COD concentration is 28 - 46 mg / L, with an average concentration of 36.67 mg / L. After ozone oxidation treatment, the final effluent COD concentration of the wastewater treatment process is lower than the discharge standard of 50 mg / L.

[0055] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A multi-stage spiral symmetric ozone oxidation device, characterized in that, Including: A tank body (1), serving as the reaction main body, which is internally divided into a primary reaction zone (1a) and a secondary reaction zone (1b). The primary reaction zone (1a) is arranged below the secondary reaction zone (1b), and a load-bearing bracket (2) is fixed at the bottom of the tank body (1); A primary ozone aeration head (3), arranged at the bottom of the primary reaction zone (1a); Two primary water inlet pipes (4), extending into the tank body (1) tangentially from both sides of the tank body (1), and the wastewater will generate a swirl in the tank body (1); A secondary ozone aeration head (5), arranged at the bottom of the secondary reaction zone (1b); Two secondary water inlet pipes (6), extending into the tank body (1) tangentially from both sides of the tank body (1), and the wastewater will generate a swirl in the tank body (1); Two outlet pipes (7), connected to the top of the tank body (1). Each outlet pipe (7) is divided into two paths, one path is connected to the water outlet, and the other path is connected back to the secondary water inlet pipe (6) in a reflux manner; An exhaust pipe (8), divided into two paths, one path is connected to the gas outlet, and the other path is connected back to the secondary ozone aeration head (5) in a reflux manner; Four sieve plates (9), two of which are arranged in the primary reaction zone (1a), and the other two are arranged in the secondary reaction zone (1b); Catalytic fillers (10), arranged between the two sieve plates (9) in the primary reaction zone (1a) and the secondary reaction zone (1b). The catalytic fillers (10) are made of an aluminum-silicon composite material, and the catalytic fillers (10) are of a polyhedral hollow sphere structure. The polyhedral hollow sphere structure has multiple vanes. A hollow balloon (11) is provided at the center of the catalytic fillers (10), enhancing the buoyancy of the catalytic fillers (10), so that the catalytic fillers (10) gather at the tops of the primary reaction zone (1a) and the secondary reaction zone (1b). The sieve plates (9) in the upper middle part of the primary reaction zone (1a) and the sieve plates (9) in the upper middle part of the secondary reaction zone (1b) are both processed into a convex spherical surface structure; Both the primary reaction zone (1a) and the secondary reaction zone (1b) adopt a spiral symmetric water distribution method.

2. The multi-stage spiral symmetric ozone oxidation device according to claim 1, wherein A number of diamond-shaped through holes are processed on the sieve plate (9).

3. The multi-stage spiral symmetric ozone oxidation device according to claim 1, characterized in that, Pressurizing devices are provided at the inlets of the primary water inlet pipe (4), the secondary water inlet pipe (6), the primary ozone aeration head (3), and the secondary ozone aeration head (5).

4. The multi-stage spiral symmetric ozone oxidation device according to claim 1, wherein A two-phase separator (12) is provided at the inlet of the exhaust pipe (8).

Images