High-salinity wastewater catalytic oxidation system and method

Abstract

The invention provides a high-salinity wastewater catalytic oxidation system and method. The system comprises at least one catalytic oxidizer; a water inlet is formed in the bottom of the catalytic oxidizer, and a water outlet is formed in the upper part; a lower-layer perforated plate, an aeration disc and an anti-passivation filler layer are sequentially arranged in the catalytic oxidizer from bottom to top, and the lower-layer perforated plate, the aeration disc and the anti-passivation filler layer are positioned between the water inlet and the water outlet; one side of the aeration disc penetrates through the side wall of the catalytic oxidizer to be connected with an ozone inlet, and a tail gas outlet is formed in the top of the catalytic oxidizer. The system is simple in overall structure, high in salt tolerance, high in ozone utilization rate and capable of stably running for a long time.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and in particular to a high-salt wastewater catalytic oxidation system and method. Background Art

[0002] The treatment of high-salinity wastewater has become a significant environmental issue in the process of industrialization. This wastewater, primarily sourced from the chemical, pharmaceutical, and food processing industries, is characterized by its high salt content, making it difficult to completely purify using traditional wastewater treatment methods. The threat to the environment and human health stems primarily from the contamination of water bodies with persistent organic matter and salts. These pollutants can lead to eutrophication, ecological imbalance, and even threaten drinking water safety.

[0003] Traditional ozone oxidation technology is inefficient in treating high-salinity wastewater: salt inhibits free radical formation, resulting in incomplete degradation of organic matter; catalysts are easily deactivated: high salt levels lead to surface passivation and metal ion dissolution; and ozone utilization is low: gas-liquid mass transfer is inefficient, and residual ozone in the exhaust gas poses a safety hazard. These factors all hinder the effectiveness of catalytic oxidation of high-salinity wastewater.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The first purpose of the present invention is to provide a high-salt wastewater catalytic oxidation system, which has a simple overall structure, strong salt resistance, high ozone utilization rate, and can operate stably for a long time. Applying this system to the treatment of high-salt wastewater can significantly improve the effect of catalytic oxidation of high-salt wastewater.

[0006] The second purpose of the present invention is to provide a method for catalytic oxidation of high-salt wastewater. By applying the above-mentioned system, this method can achieve good catalytic oxidation treatment effects and solve the problem of high-salt wastewater treatment.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted: The present invention provides a high-salt wastewater catalytic oxidation system, comprising: at least one catalytic oxidizer; a water inlet is provided at the bottom of the catalytic oxidizer, and a water outlet is provided at the top; a lower porous plate, an aeration disk and an anti-passivation filler layer are provided in sequence from bottom to top along the inner edge of the catalytic oxidizer, and the lower porous plate, the aeration disk and the anti-passivation filler layer are located between the water inlet and the water outlet; one side of the aeration disk passes through the side wall of the catalytic oxidizer to connect to the ozone inlet, and the top of the catalytic oxidizer is provided with an exhaust gas outlet.

[0008] In the above system, high-salt wastewater enters the catalytic oxidizer through the water inlet, and then passes through the lower porous plate, aeration disk and anti-passivation filler layer from bottom to top. During this process, the aeration disk can disperse the ozone gas into tiny bubbles through its microporous structure, significantly increasing the gas-liquid contact area, thereby improving the catalytic oxidation effect; the anti-passivation filler layer can provide physical support and a living microenvironment for microorganisms, reducing microbial loss, thereby ensuring that the system can operate stably for a long time; and by using a filler layer that has been treated with anti-passivation, a protective film can be formed on the filler surface to prevent the filler from losing its activity due to chemical corrosion, microbial erosion or physical wear during long-term use, which helps to significantly improve the durability and efficiency of the filler. By setting an exhaust gas outlet at the top of the catalytic oxidizer, exhaust gas treatment can be facilitated. In short, the system has a simple overall structure, strong salt tolerance, high ozone utilization rate, and can operate stably for a long time. Applying this system to the treatment of high-salt wastewater can significantly improve the effect of catalytic oxidation of high-salt wastewater.

[0009] Preferably, the catalytic oxidizers are multiple and connected in series, with the outlet of the catalytic oxidizer at the previous stage connected to the inlet of the catalytic oxidizer at the next stage. By connecting multiple catalytic oxidizers in series, the overall removal efficiency can be increased, thereby improving the treatment effect of high-salinity wastewater.

[0010] Preferably, the catalytic oxidizer is provided with an upper porous plate, located vertically above the water outlet, and having a pore size smaller than the filler particle size of the anti-passivation filler layer. The upper porous plate can filter filler particles carried in high-salinity wastewater, preventing the loss of catalytic filler within the catalytic oxidizer. This helps further ensure the long-term stable operation of the system.

[0011] Preferably, a filter plate is provided in the catalytic oxidizer, and a plurality of filter caps are sequentially provided on the bottom of the filter plate in the horizontal direction; the filter plate is located between the aeration disk and the anti-passivation filler layer. By providing a filter plate with a filter cap, the high-salt wastewater can be filtered before entering the anti-passivation filler layer, and the suspended particles, organic matter and colloidal substances therein can be intercepted. This helps to protect the filler, avoid clogging and agglomeration of suspended particles and colloidal substances, which leads to a reduction in the effective specific surface area of the filler, and effectively prolongs the service life of the anti-passivation filler layer. This method can also prevent excessively high concentrations of organic matter from directly entering the filler layer, causing the biofilm to grow too fast and too thick, affecting the treatment effect of high-salt wastewater. In addition, this method can prevent the organic matter carried in the high-salt wastewater from inhibiting the microorganisms loaded on the anti-passivation filler layer, thereby ensuring the catalytic oxidation treatment effect. Preferably, an exhaust port is provided at the lower portion of the catalytic oxidizer.

[0012] Preferably, a water collecting tank is provided in the catalytic oxidizer; the water collecting tank is located vertically above the water outlet. The design of the water collecting tank can facilitate gas-liquid separation and can act as a backwash water buffer during subsequent backwashing.

[0013] Preferably, the device further comprises a drain pipe, the inlet of which passes through the side wall of the catalytic oxidizer and is connected to the bottom of the anti-passivation packing layer. The design of the drain pipe facilitates the removal of suspended solids and other particulate matter at the bottom of the anti-passivation packing layer, thereby ensuring the long-term stable operation of the anti-passivation packing layer.

[0014] Preferably, a plurality of wall flow prevention baffles are provided on the inner wall of the middle portion of the catalytic oxidizer from top to bottom. By providing the wall flow prevention baffles, the gas-liquid-solid three-phase contact efficiency can be optimized, fluid short-circuiting can be prevented, and the reaction uniformity and ozone utilization rate can be improved.

[0015] Preferably, the water inlet is connected to a water inlet pipe, one side of which is connected to a backwash water inlet pipe; the water outlet is connected to a water outlet pipe, one side of which is connected to a backwash water outlet pipe. The backwash water inlet pipe and the backwash water outlet pipe can facilitate backwashing of the interior of the catalytic oxidizer.

[0016] The present invention also provides a method for catalytically oxidizing high-salinity wastewater, which utilizes the aforementioned high-salinity wastewater catalytic oxidation device to catalytically oxidize the high-salinity wastewater. This method is simple to operate and highly efficient, achieving a removal rate of over 35% for organic matter in the high-salinity wastewater, thus meeting environmental protection and energy conservation and emission reduction requirements.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. High-salt wastewater enters the catalytic oxidizer through the water inlet, and then passes through the lower porous plate, aeration disk and anti-passivation filler layer in sequence. During this process, the aeration disk can disperse the ozone gas into tiny bubbles through its microporous structure, significantly increasing the gas-liquid contact area, thereby improving the catalytic oxidation effect; 2. The anti-passivation filler layer can provide physical support and a living microenvironment for microorganisms, reducing the loss of microorganisms, thereby ensuring that the system can operate stably for a long time; 3. By using the filler layer after anti-passivation treatment, a protective film can be formed on the filler surface to prevent the filler from losing its activity due to chemical corrosion, microbial erosion or physical wear during long-term use, which helps to significantly improve the durability and use efficiency of the filler; 4. By setting the tail gas outlet at the top of the catalytic oxidizer, the tail gas treatment can be facilitated; 5. In summary, the system has a simple overall structure, strong salt resistance, high ozone utilization rate, and can operate stably for a long time. Applying this system to the treatment of high-salt wastewater can significantly improve the effect of catalytic oxidation of high-salt wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of a high-salt wastewater catalytic oxidation system provided in an embodiment of the present invention; Figure 2 A schematic diagram of a catalytic oxidizer provided in an embodiment of the present invention.

[0019] In the figure: 1. Water inlet pipe; 2. Backwash water inlet pipe; 3. Lower porous plate; 4. Aeration plate; 5. Filter cap; 6. Filter plate; 7. Anti-passivation filler layer; 8. Anti-wall flow baffle; 9. Upper porous plate; 10. Water collection tank; 11. Filler replenishment pipe; 12. Exhaust gas outlet; 13. Bursting membrane; 14. Water outlet pipe; 15. Backwash outlet pipe; 16. Drain pipe; 17. Catalytic oxidizer; 18. Drain port. DETAILED DESCRIPTION

[0020] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of the present invention, not all embodiments, and are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0021] In order to more clearly illustrate the technical solutions of the present invention, specific embodiments are provided below for illustration.

[0022] Example See also Figure 1-2 This embodiment provides a high-salt wastewater catalytic oxidation system, including: at least one catalytic oxidizer 17; a water inlet is provided at the bottom of the catalytic oxidizer 17, and a water outlet is provided at the top; a lower porous plate 3, an aeration disk 4 and an anti-passivation filler layer 7 are provided in sequence from bottom to top along the inner edge of the catalytic oxidizer 17, and the lower porous plate 3, the aeration disk 4 and the anti-passivation filler layer 7 are located between the water inlet and the water outlet; one side of the aeration disk 4 passes through the side wall of the catalytic oxidizer 17 to connect to the ozone inlet, and the top of the catalytic oxidizer 17 is provided with an exhaust gas outlet 12.

[0023] like Figure 2As shown, in this embodiment, the water inlet is connected to the water inlet pipe 1, one side of the water inlet pipe 1 is connected to the backwash water inlet pipe 2; the water outlet is connected to the water outlet pipe 14, one side of the water outlet pipe 14 is connected to the backwash water outlet pipe 15.

[0024] The number of catalytic oxidizers 17 can be set to multiple, and multiple catalytic oxidizers 17 are connected in series in sequence, and the water outlet of the upper catalytic oxidizer 17 is connected to the water inlet of the lower catalytic oxidizer 17. In this embodiment, Figure 1 As shown, there are three catalytic oxidizers 17, and the outlet of the previous catalytic oxidizer 17 is connected to the inlet of the next catalytic oxidizer 17 via a pipeline. Thus, the high-salt wastewater is sequentially treated by the three-stage catalytic oxidizer 17 and then discharged.

[0025] Continue reading Figure 2 An upper porous plate 9 is provided in the catalytic oxidizer 17 . The upper porous plate 9 is located above the water outlet in the vertical direction, and the pore size of the upper porous plate 9 is smaller than the filler particle size of the anti-passivation filler layer 7 .

[0026] Continue reading Figure 2 The catalytic oxidizer 17 is equipped with a filter plate 6, with multiple filter caps 5 arranged horizontally on its bottom. The filter plate 6 is located between the aeration plate 4 and the anti-passivation packing layer 7. High-salinity wastewater enters the anti-passivation packing layer 7 through the pores of the filter caps 5. During this process, suspended particles, organic matter, and colloidal substances in the high-salinity wastewater are trapped, effectively preventing clogging of the anti-passivation packing layer 7.

[0027] Continue reading Figure 2 A bursting membrane 13 is installed on top of the catalyst, and a drain port 18 is located below the catalytic oxidizer 17. Bursting membrane 13 provides high-pressure protection, ensuring safe system operation. During system maintenance or shutdown, drain port 18 can be used to drain the catalytic oxidizer 17.

[0028] Continue reading Figure 2 A water collecting tank 10 is provided in the catalytic oxidizer 17 and is located vertically above the water outlet. An external discharge pipe is connected to the water collecting tank 10.

[0029] Continue reading Figure 2 The system also includes a drain pipe 16, the inlet of which passes through the side wall of the catalytic oxidizer 17 and connects to the bottom of the anti-passivation packing layer 7. To facilitate the replenishment and replacement of the packing, the system also includes a packing replenishment pipeline 11, which can also be called a packing manhole.

[0030] Continue reading Figure 2A plurality of wall flow prevention baffles 8 are provided on the inner wall of the middle portion of the catalytic oxidizer 17 from top to bottom. In this embodiment, there are two wall flow prevention baffles 8. Of course, the number of wall flow prevention baffles 8 can also be set to three, four, or more as needed, and this is not limited in this document.

[0031] The operating principle of this system is as follows: When treating high-salt wastewater, the high-salt wastewater enters the first-stage catalytic oxidizer 17 through the water inlet pipe 1. In the catalytic oxidizer 17, the high-salt wastewater flows through the lower porous plate 3, the aeration disk 4, the filter cap 5, and the anti-passivation filler layer 7 in sequence, and enters the next-stage catalytic oxidizer 17 through the outlet pipe 14 connected to the water outlet. At the same time, ozone enters the catalytic oxidizer 17 through the ozone inlet and the aeration disk 4, passes through the anti-passivation filler and the upper porous plate 9, and is finally discharged from the exhaust outlet 12. The exhaust outlet 12 can be connected to an exhaust destruction device to treat the exhaust gas. After the high-salt wastewater is treated in the three-stage catalytic oxidizer 17 in sequence, it is discharged through the outlet pipe 14 connected to the last-stage catalytic oxidizer 17.

[0032] During backwashing, backwash water flows into the catalytic oxidizer 17 through the backwash inlet pipe 2, passes through the lower porous plate 3, aeration disk 4, filter cap 5, and anti-passivation packing layer 7 in order from bottom to top, and finally flows out through the backwash outlet pipe 15. The backwash gas enters the catalytic oxidizer 17 through the ozone inlet and aeration disk 4, passes through the anti-passivation packing and the upper porous plate 9, and is finally discharged from the exhaust outlet 12.

[0033] use Figure 1 The system shown treats high-salinity wastewater. After testing, the removal rate of difficult-to-degrade organic matter in the treated high-salinity wastewater reaches 35%, which can meet the requirements of green environmental protection and energy conservation and emission reduction.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-salt wastewater catalytic oxidation system, characterized in that: include: At least one catalytic oxidizer; a water inlet is provided at the bottom of the catalytic oxidizer, and a water outlet is provided at the top; a lower porous plate, an aeration disk and an anti-passivation filler layer are provided in sequence from bottom to top along the inner edge of the catalytic oxidizer, and the lower porous plate, the aeration disk and the anti-passivation filler layer are located between the water inlet and the water outlet; one side of the aeration disk passes through the side wall of the catalytic oxidizer to connect to the ozone inlet, and an exhaust gas outlet is provided at the top of the catalytic oxidizer.

2. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: There are multiple catalytic oxidizers, which are connected in series in sequence, and the water outlet of the catalytic oxidizer of the upper stage is connected to the water inlet of the catalytic oxidizer of the lower stage.

3. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: An upper porous plate is provided in the catalytic oxidizer, and the upper porous plate is located above the water outlet in the vertical direction. The pore size of the upper porous plate is smaller than the filler particle size of the anti-passivation filler layer.

4. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: A filter plate is provided in the catalytic oxidizer, and a plurality of filter caps are sequentially provided on the bottom of the filter plate along the horizontal direction; the filter plate is located between the aeration disk and the anti-passivation filler layer.

5. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: The lower part of the catalytic oxidizer is provided with an exhaust port.

6. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: A water collecting tank is provided in the catalytic oxidizer; the water collecting tank is located above the water outlet in the vertical direction.

7. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: It also includes a drain pipe, the drain pipe inlet of which passes through the side wall of the catalytic oxidizer and is connected to the bottom of the anti-passivation filler layer.

8. The high-salt wastewater catalytic oxidation system according to claim 1, characterized in that: A plurality of wall flow prevention baffles are arranged on the inner wall of the middle portion of the catalytic oxidizer from top to bottom.

9. The high-salt wastewater catalytic oxidation system according to any one of claims 1 to 8, characterized in that: The water inlet is connected to a water inlet pipe, one side of which is connected to a backwash water inlet pipe; the water outlet is connected to a water outlet pipe, one side of which is connected to a backwash water outlet pipe.

10. A method for catalytic oxidation of high-salt wastewater, characterized in that: The high-salt wastewater catalytic oxidation device according to any one of claims 1 to 9 is used to carry out catalytic oxidation treatment on high-salt wastewater.

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