Catalytic ozonation wastewater treatment device capable of preventing catalytic bed layer from being blocked
By setting backwash air intake and water intake measures in the ozone catalytic oxidation wastewater treatment device, combined with the catalytic buffer layer, the problem of catalytic bed blockage is solved, the normal operation and treatment effect of the device is ensured, and efficient pollutant removal and Low maintenance costs.
Patent Information
- Application Number
- CN202420973877.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-08
AI Technical Summary
The catalytic bed in the ozone catalytic oxidation wastewater treatment device is prone to blockage, resulting in a decrease in the gas-water mass transfer contact efficiency and affecting the normal operation of the device.
Set up a backwash air inlet and a backwash water inlet in the catalytic oxidation tower, combine a catalytic buffer layer (cobbles or porcelain ball layer) to prevent the catalytic bed from being blocked, and remove suspended matter through gas-water backwashing measures to ensure the catalytic bed layer normal operation.
It effectively prevents the catalytic bed blockage, ensures the normal operation of the ozone catalytic oxidation wastewater treatment device, improves the treatment effect, reduces maintenance costs, is easy to operate, and has good application prospects.
Smart Images
Figure CN222226067U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a wastewater treatment device in the field of environmental protection, in particular to an ozone catalytic oxidation wastewater treatment device which can prevent clogging of a catalytic bed. Background Art
[0002] Ozone catalytic oxidation technology is a relatively mature wastewater treatment process. To put it simply, it is to catalyze ozone to generate highly oxidizing hydroxyl free radicals under the action of a catalyst, which oxidizes the pollutants in the wastewater and mineralizes them into small molecules or generates carbon dioxide and water, thereby achieving the purpose of removing pollutants or reducing biological toxicity.
[0003] Ozone catalytic oxidation can be used for wastewater pretreatment to improve the biodegradability of wastewater, and can also be used for deep treatment of wastewater to ensure that wastewater is discharged in compliance with discharge standards.
[0004] Ozone catalytic oxidation technology has the advantages of low operating costs, high pollutant removal efficiency and simple process, and is widely used in practical engineering.
[0005] Although ozone catalytic oxidation technology has many advantages, the problem of catalytic bed blockage often occurs in actual projects. This is mainly because the influent contains suspended matter, which will cause the suspended matter to accumulate in the catalytic bed after long-term operation, thereby reducing the gas-water mass transfer contact efficiency and ultimately affecting the normal operation of the device. Therefore, effectively solving the catalytic bed blockage is the key to ensuring the stable operation of this technology. Utility Model Content
[0006] In view of the problem that the catalytic bed is prone to clogging, the utility model aims to provide an ozone catalytic oxidation wastewater treatment device which can prevent the catalytic bed from being clogged.
[0007] The purpose of this utility model is achieved through the following technical solutions:
[0008] The main structure of the ozone catalytic oxidation wastewater treatment device of the utility model is composed of a catalytic oxidation tower, the lower end of the catalytic oxidation tower is respectively provided with a backwash air inlet, a backwash water inlet, a water inlet and an air inlet from bottom to top, the upper end of the catalytic oxidation tower is respectively provided with a water outlet, a backwash water outlet and a breathing port, the catalytic oxidation tower is respectively provided with a backwash air distribution disk, a backwash water distributor, a water inlet distributor, an ozone air distribution disk, a catalytic buffer layer, a catalytic bed and an overflow weir from bottom to top, the backwash air inlet is connected to the backwash air distribution disk, the backwash water inlet is connected to the backwash water distributor, the water inlet is connected to the water inlet distributor, and the air inlet is connected to the ozone air distribution disk; the backwash air inlet, the backwash air inlet of the backwash air distribution disk and / or the backwash water inlet, and the backwash water inlet of the backwash water distributor below the catalytic bed are used to prevent the catalytic bed from being blocked.
[0009] Wherein: the catalytic buffer layer is a pebble layer or a porcelain ball layer.
[0010] When the catalytic buffer layer is a pebble layer, the pebble particle size of the pebble layer decreases from bottom to top to the ozone catalyst particle size in the catalytic bed layer; when the catalytic buffer layer is a porcelain ball layer, the porcelain ball particle size of the porcelain ball layer decreases from bottom to top to the ozone catalyst particle size in the catalytic bed layer.
[0011] The catalytic bed is located above the catalytic buffer layer. The catalytic bed is composed of a heterogeneous ozone catalyst, which is prepared by a carrier-loaded catalytically active metal oxide.
[0012] The water outlet and the backwash outlet are both arranged above the overflow weir, and the oxidation effluent and overflow effluent in the catalytic oxidation tower flow out from the water outlet and / or the backwash outlet through the overflow weir.
[0013] The breathing port is arranged at the top of the catalytic oxidation tower.
[0014] The outside of the catalytic oxidation tower is also provided with a tower bottom operation port, a filler filling port A, a filler filling port B and a tower top operation port from bottom to top.
[0015] The tower bottom operation port is arranged above the ozone distribution plate and below the catalytic buffer layer.
[0016] The filler filling port A is arranged above the catalytic buffer layer, and is used to fill the catalytic buffer layer with catalytic buffer filler; the filler filling port B is arranged above the catalytic bed layer, and is used to fill the catalytic bed layer with catalyst.
[0017] The tower top operation port is arranged above the overflow weir and below the breathing port.
[0018] The advantages and positive effects of the utility model are:
[0019] 1. The utility model solves the problem of catalytic bed blockage by arranging backwash water inlet and backwash air inlet and ensures the normal operation of the ozone catalytic oxidation wastewater device; at the same time, a catalytic buffer layer is arranged in the ozone catalytic oxidation wastewater device, which effectively avoids the impact of air-water backwashing on the catalytic bed and ensures that the backwash operation will not reduce the catalytic oxidation effect.
[0020] 2. The utility model has good treatment effect, simple operation, low maintenance cost and good application prospect. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the internal structure of the utility model;
[0022] Among them: 1 is the backwash air inlet, 2 is the backwash air distribution plate, 3 is the backwash water inlet, 4 is the backwash water distributor, 5 is the water inlet, 6 is the water inlet distributor, 7 is the air inlet, 8 is the ozone air distribution plate, 9 is the tower bottom operation port, 10 is the catalytic buffer layer, 11 is the filler filling port A, 12 is the catalytic bed layer, 13 is the catalytic oxidation tower, 14 is the filler filling port B, 15 is the water outlet, 16 is the overflow weir, 17 is the backwash water outlet, 18 is the tower top operation port, and 19 is the breathing port. DETAILED DESCRIPTION
[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0024] like Figure 1 As shown, the main structure of the ozone catalytic oxidation wastewater treatment device of the utility model is composed of a catalytic oxidation tower 13, the lower end of the catalytic oxidation tower 13 is respectively provided with a backwash air inlet 1, a backwash water inlet 3, a water inlet 5 and an air inlet 7 from bottom to top, the upper end of the catalytic oxidation tower 13 is respectively provided with a water outlet 15, a backwash water outlet 17 and a breathing port 19, and the catalytic oxidation tower 13 is respectively provided with a backwash air distribution plate 2, a backwash water distributor 4, a water inlet water distributor 6, an ozone air distribution plate 8, a catalytic buffer layer 10, a catalytic bed layer 12 and an overflow weir 16 from bottom to top; in order to achieve the backwash effect, the utility model connects the backwash air inlet 1 with the backwash air distribution plate 2, The backwash water inlet 3 is connected to the backwash water distributor 4, the water inlet 5 is connected to the water inlet distributor 6, and the air inlet 7 is connected to the ozone air distribution plate 8; through the backwash air inlet 1 and the backwash air distribution plate 2 and / or the backwash water inlet 3 and the backwash water distributor 4 below the catalytic bed 12, the backwash air inlet and backwash water inlet measures are arranged at the lowest point inside the catalytic oxidation tower 13 to ensure that the air-water backwashing removes the suspended matter remaining in the catalytic bed 12, the catalytic buffer layer 10, the water inlet distributor 6 and the ozone air distribution plate 8, prevents the catalytic bed 12 from being blocked, and ensures the normal operation of the catalytic oxidation wastewater treatment device.
[0025] In order to prevent the gas-water backwash from damaging the catalytic bed 12, a catalytic buffer layer 10 is provided in this embodiment. The hardness of the catalytic buffer layer 10 is relatively high. The catalytic buffer layer 10 of this embodiment is a pebble layer or a porcelain ball layer.
[0026] The catalytic bed 12 of the present embodiment is arranged above the catalytic buffer layer 10, and the catalytic bed 12 is composed of a heterogeneous ozone catalyst, which is prepared by a carrier such as activated alumina, ceramsite, molecular sieve and activated carbon to support catalytically active metal oxides, so the ozone catalyst has both the catalytic effect of the active component and the adsorption function of the carrier. The ozone catalyst of the present embodiment is a commercially available product purchased from Shandong Long An Tai Environmental Protection Technology Co., Ltd.
[0027] Ozone is introduced into the catalytic oxidation tower 13 from the ozone gas distribution plate 8, and needs to pass through the catalytic buffer layer 10 before contacting the catalytic bed 12. When the catalytic buffer layer 10 is a pebble layer, the particle size of the pebble layer decreases uniformly from bottom to top to the particle size of the ozone catalyst in the catalytic bed 12; when the catalytic buffer layer 10 is a porcelain ball layer, the particle size of the porcelain ball layer decreases uniformly from bottom to top to the particle size of the ozone catalyst in the catalytic bed 12; this can ensure a good mass transfer effect between the ozone bubbles and the ozone catalyst, and can also reduce the damage to the catalytic bed 12 caused by gas-water backwashing.
[0028] The water outlet 15 and the backwash water outlet 17 of this embodiment are both arranged above the overflow weir 16, and the oxidation effluent and the overflow effluent in the catalytic oxidation tower 13 flow out from the water outlet 15 and / or the backwash water outlet 17 through the overflow weir 16; the breathing port 19 of this embodiment is arranged at the top of the catalytic oxidation tower 13. After the ozone oxidation and the gas-water backwashing are completed, the oxidation effluent and the backwash effluent do not flow out directly from the water outlet 15 and the backwash water outlet 17, but flow out after overflowing through the overflow weir 16; the purpose of such arrangement is to ensure a more complete separation of the gas-liquid two phases and to ensure that the effluent overflows evenly.
[0029] The outside of the catalytic oxidation tower 13 of this embodiment is further provided with a bottom operation port 9, a filler filling port A11, a filler filling port B14 and a top operation port 18 from bottom to top. The bottom operation port 9 is arranged above the ozone gas distribution plate 8 and below the catalytic buffer layer 10, and its function is to facilitate access to install and inspect the water and gas distribution device; the filler filling port A11 is arranged above the catalytic buffer layer 10, and is used to fill the catalytic buffer layer 10 with catalytic buffer filler; the filler filling port B14 is arranged above the catalytic bed 12, and is used to fill the catalytic bed 12 with catalyst; the top operation port 18 is arranged above the overflow weir 16 and below the breathing port 19, and the function of the top operation port 18 is to install and inspect the top water outlet and overflow facilities to ensure the normal operation of the device.
[0030] The air distribution plate and water distributor of the utility model are both prior art and will not be described in detail here.
[0031] In order to prevent the catalytic bed 12 from being blocked, the utility model comprises the following steps:
[0032] Step 1: Single air washing
[0033] (1) closing the water inlet 5 and the water outlet 15 of the catalytic oxidation tower 13 to stop water inflow;
[0034] (2) closing the air inlet 7 of the catalytic oxidation tower 13 to stop air intake;
[0035] (3) Open the breathing port 19 at the top of the catalytic oxidation tower 13;
[0036] (4) Open the backwash air inlet 1 of the catalytic oxidation tower 13 and adjust the air wash intensity to 15-25 L·m -2 ·s -1 , time is 5 to 10 minutes.
[0037] Step 2: Combined backwashing of air and water
[0038] (1) Open the backwash outlet 17 of the catalytic oxidation tower 13;
[0039] (2) Open the backwash water inlet 3 of the catalytic oxidation tower 13, start backwash water inlet, and adjust the water washing intensity to 4-6 L·m -2 ·s -1 ;
[0040] (3) Adjust the air washing intensity to 10-15 L·m -2 ·s -1 , start gas-water combined backwashing for 3 to 5 minutes.
[0041] Step 3: Wash separately
[0042] (1) Close the backwash air inlet 1 and the breathing port 19 at the top of the catalytic oxidation tower 13, and stop the backwash air intake;
[0043] (2) Adjust the water washing intensity to 5-10 L·m -2 ·s -1 , start washing with water alone for 5 to 10 minutes.
[0044] Step 4: Restore normal water inflow
[0045] (1) closing the backwash water inlet 3 and the backwash water outlet 17 of the catalytic oxidation tower 13, and stopping the backwash water inlet;
[0046] (2) opening the water inlet 5 of the catalytic oxidation tower 13, opening the water outlet 15, and resuming water inflow;
[0047] (3) Open the air inlet 7 of the catalytic oxidation tower 13 to restore air intake.
[0048] The utility model can effectively solve the problem of clogging of the catalyst bed 12 by setting up air-water backwash measures, thereby ensuring the normal operation of the catalytic oxidation wastewater treatment device. At the same time, a catalyst buffer layer 10 is set in the catalytic oxidation tower 13, and under the catalytic effect of the active components of the ozone catalyst and the adsorption effect of the carrier, the pollutants are effectively removed, thereby obtaining a satisfactory treatment effect. Compared with other similar devices, the utility model has the advantages of good treatment effect, strong operation stability and simple operation, and has a good application prospect.
[0049] Experimental Example 1
[0050] Taking the biochemical effluent of a sewage treatment plant in a chemical park as an example, under the condition of long-term operation, the treatment effect of the wastewater by the ordinary ozone catalytic oxidation device and the utility model is compared. (The ordinary ozone catalytic oxidation device does not have a gas-water backwashing measure)
[0051] Effect of common ozone catalytic oxidation device on wastewater treatment
[0052]
[0053] The utility model has a good effect on wastewater treatment
[0054]
[0055] Experimental Example 2
[0056] Taking the biochemical effluent of a chemical enterprise as an example, the treatment effects of the ordinary ozone catalytic oxidation device and the utility model on wastewater are compared. (The ordinary ozone catalytic oxidation device does not have a gas-water backwashing measure)
[0057] Effect of common ozone catalytic oxidation device on wastewater treatment
[0058]
[0059] The utility model has a good effect on wastewater treatment
[0060]
[0061] With reference to the above experimental results, it can be seen that under the condition of long-term operation, the utility model not only has a high COD removal efficiency, but also can ensure that the SS of the effluent is maintained at a low level, indicating that the utility model has good performance.
Claims
1. An ozone catalytic oxidation wastewater treatment device that prevents clogging of the catalyst bed, characterized in that: The main structure of the ozone catalytic oxidation wastewater treatment device is composed of a catalytic oxidation tower (13). The lower end of the catalytic oxidation tower (13) is respectively provided with a backwash air inlet (1), a backwash water inlet (3), a water inlet (5) and an air inlet (7) from bottom to top. The upper end of the catalytic oxidation tower (13) is respectively provided with a water outlet (15), a backwash water outlet (17) and a breathing port (19). The inside of the catalytic oxidation tower (13) is respectively provided with a backwash air distribution plate (2), a backwash water distributor (4), a water inlet distributor (6), an ozone air distribution plate (8), a catalytic A buffer layer (10), a catalytic bed (12) and an overflow weir (16), the backwash air inlet (1) is connected to a backwash air distribution plate (2), the backwash water inlet (3) is connected to a backwash water distributor (4), the water inlet (5) is connected to a water inlet distributor (6), and the air inlet (7) is connected to an ozone air distribution plate (8); the catalytic bed (12) is prevented from being blocked by the backwash air inlet (1) below the catalytic bed (12), the backwash air inlet of the backwash air distribution plate (2) and / or the backwash water inlet (3) and the backwash water distributor (4).
2. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 1 is characterized in that: The catalytic buffer layer (10) is a pebble layer or a porcelain ball layer.
3. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 2 is characterized in that: When the catalytic buffer layer (10) is a pebble layer, the particle size of the pebbles in the pebble layer decreases from bottom to top to the particle size of the ozone catalyst in the catalytic bed layer (12); when the catalytic buffer layer (10) is a porcelain ball layer, the particle size of the porcelain balls in the porcelain ball layer decreases from bottom to top to the particle size of the ozone catalyst in the catalytic bed layer (12).
4. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 1 is characterized in that: The catalytic bed (12) is located above the catalytic buffer layer (10), and the catalytic bed (12) is composed of a heterogeneous ozone catalyst, which is prepared by a carrier-supported catalytically active metal oxide.
5. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 1 is characterized in that: The water outlet (15) and the backwash water outlet (17) are both arranged above the overflow weir (16), and the oxidation effluent and overflow effluent in the catalytic oxidation tower (13) flow out from the water outlet (15) and / or the backwash water outlet (17) through the overflow weir (16).
6. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 1 is characterized in that: The breathing port (19) is arranged at the top of the catalytic oxidation tower (13).
7. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 1 is characterized in that: The exterior of the catalytic oxidation tower (13) is also provided with a tower bottom operation port (9), a filler loading port A (11), a filler loading port B (14) and a tower top operation port (18) from bottom to top.
8. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 7 is characterized in that: The tower bottom operation port (9) is arranged above the ozone distribution plate (8) and below the catalytic buffer layer (10).
9. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 7 is characterized in that: The filler loading port A (11) is arranged above the catalytic buffer layer (10) and is used to fill the catalytic buffer layer (10) with catalytic buffer filler; the filler loading port B (14) is arranged above the catalytic bed layer (12) and is used to fill the catalytic bed layer (12) with catalyst.
10. The ozone catalytic oxidation wastewater treatment device for preventing catalytic bed clogging according to claim 7 is characterized in that: The tower top operation port (18) is arranged above the overflow weir (16) and below the breathing port (19).