CN115893638A - Multi-stage spiral symmetrical ozone oxidation device - Google Patents

Abstract

The invention discloses a multi-stage spiral symmetrical 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, and a primary ozone aeration head, which is arranged in the primary reaction zone the bottom of the bottom; the primary water inlet pipe extends into the tank from both sides of the stainless steel tank along the tangential direction; the secondary ozone aeration head is set at the bottom of the secondary reaction zone; the secondary water inlet pipe extends from the two sides of the stainless steel tank The side extends into the tank along the tangential direction; the outlet pipe is divided into two routes, one is connected to the water outlet, and the other is connected to the secondary water inlet pipe; the exhaust pipe is connected to the air outlet, and the other is connected to the secondary ozone aeration head; There are four sieve plates, two of which are set in the primary reaction zone and the other two are set in the secondary reaction zone; catalytic packing is set between the two sieve plates in the primary reaction zone and the secondary reaction zone In the meantime, the 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

Multi-stage spiral symmetrical ozone oxidation device

technical field

- The present invention relates to the field of wastewater treatment, in particular to a wastewater ozone oxidation treatment device.

Background technique

With the rapid development of industry, the discharge of industrial wastewater is increasing, and the composition is more complex. The water contains many organic compounds that are difficult to degrade, such as phenolic compounds, polycyclic aromatic hydrocarbons, heterocyclic compounds, polychlorinated biphenyls and other compounds. , causing aggravation of natural water pollution, seriously threatening people's health, and restricting the development of social economy and science and technology. These industrial wastewaters include pharmaceutical wastewater, coal chemical wastewater, pulping wastewater, oil refining wastewater, etc., which have the characteristics of high biological toxicity, bacteriostatic substances and low biodegradability, which cause the inactivation of traditional biological treatment methods, so they are in urgent need of development. New water treatment technology.

The existing wastewater advanced treatment technologies mainly include activated carbon adsorption, Fenton oxidation, electrocatalytic oxidation, and membrane separation technology, but all of them have application bottlenecks to varying degrees. The operating cost of the activated carbon adsorption process is high, it is easy to absorb saturation and difficult to desorb, and it is easy to be 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 one-time investment of the electrocatalytic oxidation technology is relatively large 1. Plate consumption is fast, and the operating cost is high; membrane separation technology has a large investment, high operating cost, and the membrane concentrated water produced is difficult to treat, and there are also major defects.

Ozone catalytic oxidation technology is an efficient wastewater advanced treatment technology. Compared with other advanced treatment technologies, ozone catalytic oxidation technology is more mature in application and has better treatment effect. Ozone has the advantages of strong oxidation ability (second only to fluorine, OH), fast reaction speed, no sludge and secondary pollution, and the ability to improve the biodegradability of water. The application of ozone in wastewater treatment has attracted more and more attention. .

While ozone catalytic oxidation technology is widely used, it also has some defects and deficiencies. For example, existing ozone catalytic oxidation devices generally have the phenomenon of low ozone utilization rate and poor gas-liquid mass transfer effect. Therefore, it is necessary to optimize the existing ozone catalytic oxidation device, so as to improve the catalytic reaction efficiency and strengthen the treatment effect.

Contents of the invention

Aiming at 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 efficiency of wastewater treatment. processing effect.

The object of the present invention is achieved in that a kind of multi-stage spiral symmetrical ozonation device comprises:

The stainless steel tank, as the main body of the reaction, is divided into a primary reaction area and a secondary reaction area. The primary reaction area is set below the secondary reaction area, and the bottom is fixed with a load-bearing bracket;

The primary ozone aeration head is set at the bottom of the primary reaction zone;

There are two first-level water inlet pipes, which extend into the tank from both sides of the stainless steel tank along the tangential direction;

The secondary ozone aeration head is set at the bottom of the secondary reaction zone;

There are two secondary water inlet pipes, which extend into the tank from both sides of the stainless steel tank along the tangential direction;

There are two outlet pipes, which are connected to the top of the tank and divided into two routes, one is connected to the water outlet, and the other is connected to the secondary water inlet pipe for return flow;

The exhaust pipe is divided into two paths, one path is connected to the air outlet, and the other path is connected to the secondary ozone aeration head for return flow;

There are four sieve plates, two of which are set in the primary reaction zone, and the other two are set in the secondary reaction zone;

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

Working principle of the present invention is:

The waste water is sent into the tank by two water inlet pipes. Due to the tangential relationship, the waste water entering the pipes will form a swirling flow in the tank. Wastewater flows up in a spiral state; at the same time, ozone is introduced from the first-level ozone aeration head, and it rises evenly under the action of the sieve plate, and the ozone, catalytic filler and wastewater are fully stirred and mixed in the first-level reaction zone, and collide with each other; As the liquid level rises, the wastewater enters the secondary reaction zone, and reacts again in the same way. Unlike the primary reaction zone, part of the ozone and wastewater in the secondary reaction zone will flow back through the outlet pipe and exhaust pipe to recirculate and react again.

The invention feeds water through two water inlet pipes in a tangential direction, so that the waste water generates a swirling flow in the tank body, so that the ozone and the catalytic filler are fully contacted during the agitation process, which can effectively solve the problem of dead zone in the existing reaction, and further solve the problem of low utilization rate of ozone , The problem of poor gas-liquid mass transfer effect; at the same time, such a structure saves external stirring and simplifies the structure.

The present invention limits the catalytic filler to a certain area through the designed partition, which solves the problem that the existing filler is easily washed away. At the same time, it also reduces the suspension speed of the water body and ensures that the water body and ozone, The contact time of the catalytic packing is long to achieve full reaction, further solving the problems of low ozone utilization rate and poor gas-liquid mass transfer effect.

The two-stage reaction area designed by the present invention, wherein the first-stage reaction area is used as the main reaction area, can oxidize and degrade most of the organic pollutants in the sewage; Part of the water is sent back to the secondary reaction zone, which prolongs the contact time between wastewater, ozone and catalytic packing, thereby solving the existing problems of low ozone utilization rate and poor gas-liquid mass transfer effect;

Compared with prior art, the beneficial effect of the present invention is:

The invention makes the waste water enter into the tank obliquely and parallel by design, and can quickly form a rotating fluid in the treatment area, and stir the packing, so that ozone, waste water, and catalytic packing are fully contacted, compared with the traditional side flow water inlet method , can more effectively reduce the dead angle in the device, and increase the contact time and contact area of ozone, wastewater, and catalytic fillers, improve the catalytic oxidation efficiency of the system, and save energy without other stirring equipment;

The invention designs a secondary circulation treatment system, and through returning the discharged water and gas to the circulation reaction zone, the organic pollutants in the sewage are further oxidized, and the utilization efficiency of ozone is improved.

As a further improvement of the present invention, the catalytic filler is made of aluminum-silicon composite material, and the catalytic filler is a polyhedral hollow sphere structure. First of all, aluminum-silicon composite materials have better catalytic effect, high mechanical strength, and strong resistance to adverse environments. Secondly, the polyhedral hollow sphere structure has multiple blades and a large specific surface area, which enhances the catalyst and wastewater, ozone. The contact area is large, which further solves the problem of low ozone utilization rate and improves the contact efficiency of ozone and wastewater; in addition, the gas flow rate inside the traditional spherical structure of activated carbon is relatively low, and the hollow polyhedral hollow sphere structure is used to speed up the ozone flow rate and improve the exchange efficiency.

As a further improvement of the present invention, the center of the catalytic packing is provided with a hollow balloon, and the sieve plate in the middle and upper part of the primary reaction zone and the sieve plate in the middle and upper part of the secondary reaction zone are both processed into a spherical structure. In the actual application process, since the catalytic filler is made of aluminum-silicon composite material, its density is slightly greater than that of wastewater. During the rotation of the water body, the traditional ozone catalytic filler is relatively distributed in the area near the inner wall of the tank, resulting in the central area. The waste water cannot fully contact with the filler, which causes a series of problems such as the inability of the catalytic material to fully catalyze the reaction with the ozone gas. The present invention enhances the buoyancy of the catalytic packing by arranging a hollow balloon at the center of the polyhedral hollow sphere structure, so that the catalytic packing can gather at the top of the reaction zone, and at the same time, process the sieve plate at the upper part of the reaction zone into an arc-shaped spherical structure , under the effect of enhanced buoyancy, a part of the catalytic packing will slide to the center of the sieve plate, making the distribution of the catalytic packing more uniform, thereby solving the problem of uneven distribution of the existing catalytic packing and ensuring full contact between the wastewater in the reaction area and the packing. make the response more adequate.

As a further improvement of the present invention, several 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 hole punching process is simple, and the mechanical strength is high.

As a further improvement of the present invention, the inlets of the primary water inlet pipe, the secondary water inlet pipe, the primary ozone aeration head, and the secondary ozone aeration head are all provided with pressurizing devices. By designing the pressurization device, the flow rate can be enhanced to ensure the reaction effect.

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 help the discharge and circulation of ozone.

Description of drawings

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 that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a sectional view along the line A-A in Fig. 1 .

Fig. 3 is a sectional view along the direction B-B in Fig. 1 .

Fig. 4 is a schematic diagram of the structure of the catalytic packing in the present invention.

Among them, 1 tank, 1a primary reaction zone, 1b secondary reaction zone, 2 load-bearing brackets, 3 primary ozone aeration head, 4 primary water inlet pipe, 5 secondary ozone aeration head, 6 secondary water inlet pipe, 7 outlet pipe, 8 exhaust pipe, 9 sieve plate, 10 catalytic packing, 11 balloon, 12 two-phase separator.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

A kind of multi-stage spiral symmetrical ozonation device as shown in Figure 1-4, comprises:

The stainless steel tank 1, as the main body of the reaction, is internally divided into a primary reaction zone 1a and a secondary reaction zone 1b, the primary reaction zone 1a is set below the secondary reaction zone 1b, and a load-bearing bracket 2 is fixed at the bottom, through which the load-bearing bracket 2 fixed on the ground;

The first-stage reaction zone 1a is surrounded by two partitions, and the bottom of the next partition is provided with a first-stage ozone aeration head 3. There is a first-level water inlet pipe 4 on the top, and there are two first-level 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. The inlet of the first-level water inlet pipe 4 is provided with a water pump and connected to waste water source;

The secondary reaction zone 1b is also surrounded by two partitions. A secondary ozone aeration head 5 is arranged under the next partition, and the secondary aeration head is connected to the exhaust pipe 8. At the same time, it cooperates with the air pump to pressurize. The top of the next partition is provided with a secondary water inlet pipe 6, and there are two secondary water inlet pipes 6, which extend into the tank body 1 from both sides of the stainless steel tank body 1 along the tangential direction, and the secondary water inlet pipe 6 is connected next to the stainless steel tank body 1. On the outlet pipe 7;

The exhaust pipe 8 extends from the top of the tank body 1, and the entrance of the exhaust pipe 8 is provided with a two-phase separator 12, which is divided into two routes, one of which is connected to the gas outlet, and the other is connected to the secondary ozone aeration head 5 for return flow;

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

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

Ozone enters the device through the ozone generator at a pressure of 0.8-1.2MPa, and enters the primary reaction zone 1a through the sieve plate 9; the sieve plate 9 is a diamond-shaped hole with a hole size of 8-12mm; Diagonal parallel entry into the treatment area.

When working, the waste water that enters the pipeline through the pressurization of the water pump will form a swirling flow in the device. With the continuous increase of the liquid level in the reactor, the waste water in the entire reaction zone will flow upward in a spiral state, which can make The ozone, catalytic filler 10 and waste water in the reaction zone are fully agitated and mixed, and come into contact with each other.

The ozone catalyst filler is made of aluminum-silicon composite material. The composite material carrier further enhances the carrier strength, low wear consumption, high mechanical strength, and the high strength of the catalyst carrier realizes that the catalytic components are not lost or replaced, and the long-term operation is stable and efficient. The shape is hollow and multi-faceted Hollow spherical shape with a diameter of 25mm has the advantages of high gas velocity, many blades, small resistance, and large specific surface area.

In the primary reaction zone 1a, the ozone and the catalytic packing 10 fully contact during the agitation process of the water flow, and quickly oxidize the organic pollutants in the sewage, reducing the concentration of organic pollutants in the water, thereby achieving the effect of advanced wastewater treatment . It can effectively solve the dead angle area in the device and reduce the loss of water head; at the same time, the lift pump is directly used to pressurize and inject water from the bottom, which can simplify the device without mechanical external force stirring.

The sieve plate 9 separates the catalytic packing 10 and prevents 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, and the swirling speed of the water body is reduced through the baffle plate and the sieve plate 9, and a two-phase separator 12 is designed on the top of the device, and the treated sewage is discharged through the overflow weir To the water outlet pipe 7, part of it will undergo subsequent biochemical treatment, and part of it will continue to be pressurized by the water pump and enter the secondary reaction zone 1b; the unused ozone tail gas will be collected through the two-phase separator 12, and part of the tail gas will be discharged without pollution after passing through the ozone destroyer. The other part is pressurized and enters the secondary reaction zone 1b for aeration to improve the utilization efficiency of ozone. The secondary reaction zone 1b adopts a spiral symmetrical water distribution method to fully contact the ozone, the catalytic packing 10 and the waste water, thereby improving the treatment efficiency of the system.

The ozone oxidation device is divided into the primary reaction zone 1a, which can oxidize and degrade most of the organic pollutants in the sewage; the secondary reaction zone 1b, the remaining ozone discharged from the device and the treated water part are returned to the secondary reaction zone 1b under pressure, and further The treatment efficiency of organic pollutants in wastewater is improved, and the utilization efficiency of ozone is increased. Both the primary reaction zone 1a and the secondary reaction zone 1b adopt a spiral symmetrical water distribution method, which can effectively promote the direct contact time of ozone, waste water and catalytic packing 10, and improve the oxidation efficiency of ozone.

After the reaction, the gas and waste water enter the secondary reaction zone 1b to continue to be oxidized, and the swirling water passes through the baffle plate and the sieve plate 9 to slow down the flow rate, and then passes through the two-phase separator 12 for gas-liquid separation. The waste water passes through the overflow weir, and part of it enters the secondary reaction zone 1b after being pressurized to the effluent return pipe, and part of it is discharged through the waste water outlet pipe 7. After the remaining ozone is collected by the ozone collection pipeline, part of it enters the secondary reaction zone 1b through circulation. Aeration, a part of the ozone is discharged through the exhaust pipe 8, and is safely discharged after being treated by the ozone destroyer.

Example 2:

This embodiment provides an actual experimental example of the application of the above-mentioned multi-stage spiral symmetrical ozonation device in sewage treatment:

Sewage treatment process of an oil refinery in Linyi, Shandong: After the sedimentation tank, an ozone advanced treatment device is designed. After the wastewater is oxidized by ozone, the effluent is sent to the secondary biochemical tank for biological treatment. Discharge up to standard after treatment. After the refinery sewage is treated by the original process, the COD concentration of the effluent is about 100mg/L. Now it is required that the effluent can be discharged below 50mg/L, so advanced treatment is required. After advanced ozone treatment, the influent and effluent effect, within 60 days, the influent COD concentration is 92-120mg/L, with an average concentration of 105.6mg/L, and the effluent COD concentration is 28-46mg/L, with an average concentration of 36.67mg/L. After ozone oxidation treatment, the COD concentration of the final effluent of the sewage treatment process is lower than the discharge standard of 50mg/L.

The descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some 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 (6)

1. A multi-stage spiral symmetrical ozone oxidation device is characterized by comprising:

the stainless steel tank body (1) is used as a reaction main body, the interior of the stainless steel tank body is divided into a first-stage reaction area (1 a) and a second-stage reaction area (1 b), the first-stage reaction area (1 a) is arranged below the second-stage reaction area (1 b), and a bearing support (2) is fixed at the bottom of the first-stage reaction area;

the primary ozone aeration head (3) is arranged at the bottom of the primary reaction zone (1 a);

the two primary water inlet pipes (4) extend into the tank body (1) from two sides of the stainless steel tank body (1) along the tangential direction;

the secondary ozone aeration head (5) is arranged at the bottom of the secondary reaction zone (1 b);

the two secondary water inlet pipes (6) extend into the tank body (1) from two sides of the stainless steel tank body (1) along the tangential direction;

two water outlet pipes (7) are arranged and connected to the top of the tank body (1) and divided into two paths, one path is connected with a water outlet, and the other path is connected with a secondary water inlet pipe (6) in a backflow mode;

the exhaust pipe (8) is divided into two paths, one path is connected with the air outlet, and the other path is connected with the secondary ozone aeration head (5) in a backflow mode;

the sieve plates (9) are provided with four sieve plates, wherein two sieve plates are arranged in the first-stage reaction zone (1 a), and the other two sieve plates are arranged in the second-stage reaction zone (1 b);

and the catalytic packing (10) is arranged between the two sieve plates (9) in the first-stage reaction zone (1 a) and the second-stage reaction zone (1 b).

2. The multi-stage spiral symmetrical ozonation device according to claim 1, wherein the catalytic packing (10) is made of an aluminum-silicon composite material, and the catalytic packing (10) has a polyhedral hollow sphere structure.

3. The multi-stage spiral symmetrical ozone oxidation device according to claim 2, wherein the center of the catalytic packing (10) is provided with a hollow balloon (11), and the sieve plate (9) at the middle upper part of the first-stage reaction zone (1 a) and the sieve plate (9) at the middle upper part of the second-stage reaction zone (1 b) are both processed into spherical structures.

4. The multi-stage spiral symmetrical ozonation device according to any one of claims 1 to 3, wherein a plurality of rhombic through holes are formed in the sieve plate (9).

5. The multi-stage spiral symmetrical ozone oxidation device as claimed in any one of claims 1 to 3, wherein the inlets of the first-stage water inlet pipe (4), the second-stage water inlet pipe (6), the first-stage ozone aeration head (3) and the second-stage ozone aeration head (5) are provided with pressurizing devices.

6. The multi-stage helical symmetric ozone oxidation unit according to any one of claims 1 to 3, wherein a two-phase separator (12) is provided at the inlet of the exhaust pipe (8).

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