Ozone catalytic device for treating industrial wastewater

Abstract

The utility model discloses an ozone catalytic device of handling industrial wastewater, including reactor body, be equipped with aeration zone, catalyst mat layer area, catalyst area and overflow area from below to above in proper order in the reactor body, be equipped with ozone cut -out valve on the ozone inlet pipeline of being placed the reactor body outside, be equipped with the water inlet on the reactor body lateral wall of aeration zone correspondence, and the water inlet is linked with the water inlet pipeline, be equipped with water inlet cut -out valve on the water inlet pipeline, the export end of backwash water inlet pipeline and backwash inlet pipeline all are linked with the water inlet, be equipped with backwash water inlet cut -out valve on backwash water inlet pipeline, be equipped with backwash inlet cut -out valve on backwash inlet pipeline. Advantages lie in: can effectively intercept the suspended solids in industrial wastewater, prevent aeration head micropore block and catalyst layer pore block, improve COD and color removal efficiency, combine differential pressure monitoring and backwash mechanism, can significantly prolong the continuous operation cycle of device.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, specifically to an ozone catalytic device for treating industrial wastewater. Background Technology

[0002] Industrial wastewater from coal chemical enterprises is treated using equipment and facilities such as oil separators, air flotation, SBR, ozone catalytic oxidation, and decolorization. After treatment in the SBR tank of the biochemical unit, the wastewater enters the bottom of the catalytic oxidation tank. Ozone from the ozone generation system is broken into tiny bubbles by the aeration head and then mixes with the wastewater. The ozone generates stronger and non-selective hydroxyl radicals (•OH) under the action of the catalyst, which open the ring and break the chain of the recalcitrant organic matter in the wastewater into small molecule organic matter or directly oxidize it into carbon dioxide and water. It also destroys unsaturated chromogenic groups, thus achieving effective removal of COD and color from the wastewater.

[0003] In recent years, with the widespread application of ozone catalytic oxidation technology, the types of ozone catalysts have also increased. The ozone catalyst experimental device is used to test the catalytic effect of ozone catalysts from different manufacturers on industrial wastewater under the same operating conditions. The COD and color of the produced water from the experimental device are analyzed and compared to test the removal efficiency of ozone catalysts from different manufacturers on industrial wastewater. The existing ozone experimental device is a cylindrical stainless steel device with three working areas: an aeration and mixing zone, a catalytic reaction zone, and a clear water zone. Ozone generated by the ozone generator is broken into microbubbles by the aerator at the bottom of the experimental device and enters the aeration and mixing zone. After biochemical treatment, the wastewater enters the bottom of the ozone experimental device and mixes with the ozone. It then reacts through the ozone catalyst layer. The produced water is discharged through the produced water pipeline, and the remaining ozone tail gas is discharged through the top exhaust pipeline. During the experiment, the industrial wastewater contained suspended solids. When the aeration head came into contact with the wastewater, the micropores of the aeration head became clogged, reducing the ozone intake. The suspended solids were adsorbed onto the surface of the ozone catalyst, reducing the contact area between the industrial wastewater, ozone gas, and the ozone catalyst. This further clogged the pores of the ozone catalyst layer, causing instability in the influent and ozone intake of the experimental device. Ultimately, this resulted in poor COD and color removal from the industrial wastewater, leading to inaccurate experimental data. Furthermore, the ozone exhaust pipeline of the experimental device lacked an ozone concentration detector, making it impossible to confirm the ozone consumption and resulting in inaccurate data on the ozone catalyst performance comparison. Utility Model Content

[0004] In order to solve the above problems, the purpose of this utility model is to provide an ozone catalytic device for treating industrial wastewater.

[0005] This utility model is implemented by the following technical solution:

[0006] An ozone catalytic device for treating industrial wastewater includes a reactor body, in which an aeration zone, a catalyst pad zone, a catalyst zone, and an overflow zone are arranged sequentially from bottom to top; the upper and lower ends of the catalyst pad zone and the catalyst zone are separated by a horizontally fixed support mesh within the reactor body; and the catalyst pad zone and the catalyst zone are arranged vertically adjacent to each other.

[0007] The catalyst pad region is filled with ceramic filter media, and the catalyst region is filled with metal oxide catalyst.

[0008] An annular overflow weir is provided in the reactor body corresponding to the overflow zone, and the outlet of the overflow weir is connected to the inlet of a buffer tank located outside the reactor body through a pipeline.

[0009] A drain outlet is provided at the bottom of the reactor body, and an exhaust outlet is provided at the top;

[0010] An aeration head is provided in the reactor body corresponding to the aeration zone. The aeration pipeline and the ozone inlet pipeline both penetrate the side wall of the reactor body and are connected to the air inlet of the aeration head. An aeration valve is provided on the aeration pipeline located outside the reactor body. An ozone shut-off valve is provided on the ozone inlet pipeline located outside the reactor body.

[0011] An inlet is provided on the side wall of the reactor body corresponding to the aeration zone. The inlet is connected to the inlet pipeline, and an inlet shut-off valve is provided on the inlet pipeline.

[0012] The outlet ends of both the backwash water inlet pipeline and the backwash air inlet pipeline are connected to the water inlet. A backwash water inlet shut-off valve is provided on the backwash water inlet pipeline, and a backwash air inlet shut-off valve is provided on the backwash air inlet pipeline.

[0013] Furthermore, an air inlet pressure sensor is provided at the air inlet of the aeration head, an aeration pressure sensor is provided in the reactor body corresponding to the aeration zone, and an exhaust pressure sensor is provided at the exhaust outlet.

[0014] The signal output terminals of the air intake pressure sensor, the aeration pressure sensor, and the exhaust pressure sensor are all connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the signal input terminals of the aeration valve, the backwash water inlet shut-off valve, and the backwash air inlet shut-off valve, respectively.

[0015] Furthermore, an ozone concentration sensor, an ozone flow sensor, and an ozone flow regulating valve are respectively installed on the ozone inlet pipeline located outside the reactor body downstream of the ozone shut-off valve, and an exhaust ozone concentration sensor is installed at the exhaust port.

[0016] The signal output terminals of the intake ozone concentration sensor, the exhaust ozone concentration sensor, and the ozone flow sensor are all connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the ozone flow regulating valve.

[0017] Furthermore, discharge holes are provided on the side walls of both the catalyst pad layer area and the reactor body corresponding to the catalyst area.

[0018] Advantages of this utility model:

[0019] By setting up a stratified structure between the catalyst pad layer and the catalyst compartment, suspended solids in industrial wastewater can be effectively intercepted, preventing blockage of the aeration head micropores and catalyst layer pores, ensuring stable ozone intake, and improving COD and color removal efficiency. Combined with differential pressure monitoring and backwashing mechanisms, the continuous operation cycle of the device can be significantly extended. A multi-stage pressure sensor (intake / aeration / exhaust) linkage control system automatically triggers compressed air to purge the aeration heads or performs a combined air-water backwash of the catalyst layer when the differential pressure exceeds the limit, avoiding the lag of manual intervention and solving the problem of reduced treatment efficiency caused by blockage in traditional devices. By setting up concentration sensors, flow sensors, and regulating valves, ozone consumption and reaction efficiency can be estimated, and the ozone intake flow rate can be dynamically adjusted by the controller, ensuring effective catalysis of wastewater while avoiding ozone waste. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of this embodiment;

[0021] Figure 2 This is the control principle diagram of this embodiment.

[0022] In the diagram: 1. Reactor body; 2. Aeration zone; 3. Catalyst pad zone; 4. Catalyst zone; 5. Overflow zone; 6. Support mesh; 7. Overflow weir; 8. Buffer tank; 9. Shower outlet; 10. Exhaust outlet; 11. Aeration head; 12. Aeration pipeline; 13. Ozone inlet pipeline; 14. Aeration valve; 15. Ozone shut-off valve; 16. Water inlet pipeline; 17. Water inlet shut-off valve; 18. Backwash water inlet pipeline; 19. Backwash air inlet pipeline; 20. Backwash water inlet shut-off valve; 21. Backwash air inlet shut-off valve; 22. Air inlet pressure sensor; 23. Aeration pressure sensor; 24. Exhaust pressure sensor; 25. Controller; 26. Air inlet ozone concentration sensor; 27. Ozone flow sensor; 28. Ozone flow regulating valve; 29. ​​Exhaust ozone concentration sensor; 30. Discharge port. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] like Figures 1 to 2 As shown, an ozone catalytic device for treating industrial wastewater includes a reactor body 1. Inside the reactor body 1, from bottom to top, there are an aeration zone 2, a catalyst pad zone 3, a catalyst zone 4, and an overflow zone 5. The upper and lower ends of the catalyst pad zone 3 and the catalyst zone 4 are separated by a support mesh 6 that is horizontally fixed inside the reactor body 1. The catalyst pad zone 3 and the catalyst zone 4 are arranged adjacent to each other.

[0026] The catalyst cushion layer 3 is filled with ceramic filter media, which mainly serves as mechanical support, water and gas distribution, and interception of a large amount of suspended solids. The catalyst layer 4 is filled with metal oxide catalyst. Discharge holes 30 are provided on the side walls of the reactor body 1 corresponding to the catalyst cushion layer 3 and catalyst layer 4 to facilitate the replacement of the packing.

[0027] An annular overflow weir 7 is provided in the reactor body 1 corresponding to the overflow zone 5, and the outlet of the overflow weir 7 is connected to the inlet of the buffer tank 8 placed outside the reactor body 1 through a pipeline.

[0028] A drain outlet 9 is provided at the bottom of the reactor body 1, and an exhaust outlet 10 is provided at the top;

[0029] An aeration head 11 is provided in the reactor body 1 corresponding to the aeration zone 2. The aeration pipeline 12 and the ozone inlet pipeline 13 both penetrate the side wall of the reactor body 1 and are connected to the air inlet of the aeration head 11. An aeration valve 14 is provided on the aeration pipeline 12 located outside the reactor body 1. An ozone shut-off valve 15 is provided on the ozone inlet pipeline 13 located outside the reactor body 1.

[0030] An inlet is provided on the side wall of the reactor body 1 corresponding to the aeration zone 2. The inlet is connected to the inlet pipeline 16. An inlet shut-off valve 17 is provided on the inlet pipeline 16.

[0031] The outlet ends of both the backwash water inlet pipeline 18 and the backwash air inlet pipeline 19 are connected to the water inlet. A backwash water inlet shut-off valve 20 is provided on the backwash water inlet pipeline 18, and a backwash air inlet shut-off valve 21 is provided on the backwash air inlet pipeline 19.

[0032] An air inlet pressure sensor 22 is provided at the air inlet of the aeration head 11, an aeration pressure sensor 23 is provided in the reactor body 1 corresponding to the aeration zone 2, and an exhaust pressure sensor 24 is provided at the exhaust port 10; an air inlet ozone concentration sensor 26, an ozone flow sensor 27 and an ozone flow regulating valve 28 are respectively provided on the ozone inlet pipeline 13 located outside the reactor body 1 downstream of the ozone shut-off valve 15, and an exhaust ozone concentration sensor 29 is provided at the exhaust port 10.

[0033] The signal output terminals of the air intake pressure sensor 22, aeration pressure sensor 23, exhaust pressure sensor 24, air intake ozone concentration sensor 26, exhaust ozone concentration sensor 29, and ozone flow sensor 27 are all connected to the signal input terminal of the controller 25. The signal output terminal of the controller 25 is connected to the signal input terminal of the aeration valve 14, backwash water inlet shut-off valve 20, backwash air inlet shut-off valve 21, and ozone flow regulating valve 28, respectively.

[0034] Working principle:

[0035] The ozone generated by the ozone generator is broken into tiny bubbles by the aeration head 11 at the bottom of the reactor body 1 through the ozone supply pipeline and then enters the aeration zone 2. It is mixed with the biochemically treated wastewater that enters the reactor body 1 through the water inlet pipeline 16. After passing through the catalyst pad layer 3 to intercept a large amount of suspended solids, the ozone enters the catalyst layer to react. The ozone generates stronger and non-selective hydroxyl radicals (•OH) under the action of the catalyst, which open the ring and break the chain of the recalcitrant organic matter in the wastewater into small molecule organic matter or directly oxidize it into carbon dioxide and water. It also destroys unsaturated chromogenic groups, thus effectively removing COD and color from the wastewater. The produced water is discharged from the equipment through the overflow weir 7, and the remaining ozone tail gas is discharged through the top exhaust port 10.

[0036] During operation, the device in this embodiment can monitor the real-time pressure at the air inlet of the aeration head 11 through the air inlet pressure sensor 22, monitor the real-time pressure through the aeration zone 2 through the aeration pressure sensor 23, and monitor the real-time pressure at the exhaust port 10 of the reactor body 1 through the exhaust pressure sensor 24.

[0037] When the pressure difference between the air inlet of aeration head 11 and aeration zone 2 exceeds the corresponding preset pressure difference value and lasts for 3 minutes, it indicates that aeration head 11 is blocked. Therefore, compressed air is introduced into aeration head 11 through aeration pipeline 12 to purge aeration head 11, remove suspended matter blocking the micropores of aeration head 11, and allow most of the suspended matter to be intercepted by catalyst pad zone 3, so as to avoid insufficient catalytic reaction caused by the decrease in ozone intake, which in turn leads to a decrease in the treatment effect of wastewater.

[0038] During the purging process of the aeration head 11, most of the suspended matter clogging the micropores of the aeration head 11 will be adsorbed onto the surface of the catalyst pad. However, a small amount of suspended matter will still enter the catalyst layer area. After a period of operation, some suspended matter will naturally accumulate on the surface of the catalyst pad. Therefore, when the pressure difference between the aeration zone 2 and the exhaust port 10 of the reactor body 1 exceeds the corresponding preset pressure difference value and lasts for 3 minutes, it indicates that there is a blockage on the surface of the ozone catalyst. First, open the backwash air inlet shut-off valve 21 to perform air washing on the ozone catalyst pad and catalyst layer with backwash air. Then, open the backwash water inlet shut-off valve 20 to introduce backwash water to perform backwashing on the ozone catalyst pad and ozone catalyst layer, removing the suspended matter adsorbed on the surface of the ozone catalyst, the ozone catalyst pad, and the pores of the ozone catalyst layer. The wastewater generated by backwashing is discharged from the drain port 9 at the bottom of the reactor body 1.

[0039] Furthermore, in this embodiment, ozone concentration can be monitored by the intake air ozone concentration sensor 26 and the exhaust air ozone concentration sensor 29.

[0040] The concentration of ozone in the inlet gas and the concentration of ozone in the exhaust gas of reactor body 1 are controlled by the controller 25. When the difference between the inlet ozone concentration and the exhaust ozone concentration is lower than the preset difference and continues for 5 minutes, it indicates that the ozone has not reacted sufficiently. The controller 25 controls the ozone flow regulating valve 28 to reduce the ozone inlet flow rate to improve the catalytic reaction efficiency of ozone and avoid ozone waste. Conversely, when the difference between the inlet ozone concentration and the exhaust ozone concentration is higher than the preset difference and continues for 5 minutes, it indicates that the ozone has been almost completely consumed and the reaction may be insufficient. The controller 25 needs to control the ozone flow regulating valve 28 to increase the ozone inlet flow rate to ensure effective treatment of wastewater.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ozone catalytic device for treating industrial wastewater, characterized in that, The reactor includes a reactor body, which contains, from bottom to top, an aeration zone, a catalyst pad zone, a catalyst zone, and an overflow zone. The upper and lower ends of the catalyst pad zone and the catalyst zone are separated by horizontally fixed support meshes within the reactor body. The catalyst pad zone and the catalyst zone are arranged vertically adjacent to each other. The catalyst pad region is filled with ceramic filter media, and the catalyst region is filled with metal oxide catalyst. An annular overflow weir is provided in the reactor body corresponding to the overflow zone, and the outlet of the overflow weir is connected to the inlet of a buffer tank located outside the reactor body through a pipeline. A drain outlet is provided at the bottom of the reactor body, and an exhaust outlet is provided at the top; An aeration head is provided in the reactor body corresponding to the aeration zone. The aeration pipeline and the ozone inlet pipeline both penetrate the side wall of the reactor body and are connected to the air inlet of the aeration head. An aeration valve is provided on the aeration pipeline located outside the reactor body. An ozone shut-off valve is provided on the ozone inlet pipeline located outside the reactor body. An inlet is provided on the side wall of the reactor body corresponding to the aeration zone. The inlet is connected to the inlet pipeline, and an inlet shut-off valve is provided on the inlet pipeline. The outlet ends of both the backwash water inlet pipeline and the backwash air inlet pipeline are connected to the water inlet. A backwash water inlet shut-off valve is provided on the backwash water inlet pipeline, and a backwash air inlet shut-off valve is provided on the backwash air inlet pipeline.

2. The ozone catalytic device for treating industrial wastewater according to claim 1, characterized in that, An air inlet pressure sensor is provided at the air inlet of the aeration head, an aeration pressure sensor is provided in the reactor body corresponding to the aeration zone, and an exhaust pressure sensor is provided at the exhaust outlet. The signal output terminals of the air intake pressure sensor, the aeration pressure sensor, and the exhaust pressure sensor are all connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the signal input terminals of the aeration valve, the backwash water inlet shut-off valve, and the backwash air inlet shut-off valve, respectively.

3. The ozone catalytic device for treating industrial wastewater according to claim 1, characterized in that, Downstream of the ozone shut-off valve, on the ozone inlet pipeline located outside the reactor body, an inlet ozone concentration sensor, an ozone flow sensor, and an ozone flow regulating valve are respectively provided. An exhaust ozone concentration sensor is provided at the exhaust port. The signal output terminals of the intake ozone concentration sensor, the exhaust ozone concentration sensor, and the ozone flow sensor are all connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the ozone flow regulating valve.

4. The ozone catalytic device for treating industrial wastewater according to claim 1, characterized in that, Discharge holes are provided on the side walls of the catalyst pad layer area and the reactor body corresponding to the catalyst area to facilitate the replacement of the packing.

Images