Catalytic ozonation advanced treatment device for red mud leachate

Abstract

The utility model discloses a deep treatment device for red mud leachate through catalytic ozonation. The red mud leachate treatment system comprises a solid-liquid separation unit, a homogenizing unit, a high-salt biochemical reaction unit, a catalysis unit for preparing a manganese-based catalyst, and a catalytic ozonation tower for performing catalytic ozonation on the red mud leachate, which are communicated in sequence, wherein the solid-liquid separation unit and the homogenizing unit are used for pretreating the red mud leachate; the catalytic ozonation tower is provided with a deoxidation unit, and the sludge treatment unit is respectively communicated with the solid-liquid separation unit, the homogenizing unit and the high-salt biochemical reaction unit. According to the utility model, the solid-liquid separation unit and the homogenizing unit are arranged to pretreat the red mud leachate, the obtained liquid material is subjected to catalytic ozonation through the catalytic ozonation tower to obtain an oxide material, and the oxide material is deoxidized through the deoxidation unit to obtain treated effluent; and sulfides and COD can be better removed.

Description

Technical Field

[0001] The utility model relates to the technical field of red mud leachate treatment, and more particularly to a red mud leachate ozone catalytic oxidation deep treatment device. Background Art

[0002] Red mud leachate is an industrial wastewater containing a large amount of harmful substances. Its main components include aluminum, iron, potassium, magnesium, calcium and other elements. It also contains a large amount of heavy metals and radioactive elements such as fluorine, arsenic, cadmium, and chromium. These substances are very harmful to the human body and the environment.

[0003] Red mud leachate needs to be treated to protect the environment and human health. Red mud leachate contains large amounts of heavy metals and radioactive elements. If not effectively treated, it will pollute the surrounding environment and pose a threat to human health. Treating red mud leachate can remove harmful substances, reduce environmental pollution, protect human health, and make industrial production more sustainable.

[0004] However, the effectiveness of existing red mud leachate treatment equipment in removing sulfide and COD from red mud leachate needs to be improved.

[0005] Therefore, how to provide a better red mud leachate ozone catalytic oxidation deep treatment device for removing sulfide and COD is a problem that those skilled in the art urgently need to solve. Utility Model Content

[0006] In view of this, the utility model provides a red mud leachate ozone catalytic oxidation deep treatment device to better remove sulfide and COD.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A red mud leachate ozone catalytic oxidation deep treatment device comprises a pretreatment unit for pretreating the red mud leachate, a high-salt biochemical reaction unit, a catalytic unit for preparing a manganese-based catalyst, and an ozone catalytic oxidation tower for ozone catalytic oxidation of the red mud leachate, which are connected in sequence. The ozone catalytic oxidation tower is provided with a deoxygenation unit and also includes a sludge treatment unit respectively connected to the pretreatment unit and the high-salt biochemical reaction unit.

[0009] Furthermore, the pretreatment unit includes a solid-liquid separation group and a homogenizer. The solid-liquid separation group includes a stirring tank, a desulfurization tank and a neutralization tank connected in sequence. A stirrer is provided in the stirring tank and the desulfurization tank. The stirrer located in the stirring tank is arranged at the top, and the stirrer located in the desulfurization tank is arranged at the bottom. A solid-liquid separator is provided at the top of the neutralization tank. The bottom of the desulfurization tank is connected to the solid-liquid separator at the top of the neutralization tank. The end of the neutralization tank away from the desulfurization tank is connected to the homogenizer. The neutralization tank and the homogenizer are both connected to the sludge treatment unit.

[0010] Furthermore, the catalytic unit is provided with a catalytic carrier, an immersion tank and a baking furnace, the active components are arranged in the immersion tank, and the catalytic carrier is in complete contact with the active components.

[0011] Furthermore, a manganese-based catalyst is arranged in the ozone catalytic oxidation tower, and the filling rate of the manganese-based catalyst is 50% to 80% of the volume of the ozone catalytic oxidation tower.

[0012] Furthermore, it also includes an ozone tank, which is connected to the ozone catalytic oxidation tower, and the ozone tank is connected to the inside of the ozone catalytic oxidation tower located below the manganese-based catalyst, and an ozone concentration detector is provided on the connecting pipeline between the ozone tank and the ozone catalytic oxidation tower.

[0013] Furthermore, it also includes a thermometer, which is arranged on the baking oven.

[0014] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a red mud leachate ozone catalytic oxidation deep treatment device, which pre-treats the red mud leachate by setting a solid-liquid separation unit and a homogenization unit; the obtained liquid material is ozone catalytically oxidized by an ozone catalytic oxidation tower to obtain an oxide material, and the oxide material is deoxygenated by a deoxygenation unit to obtain treated effluent; the sulfide in the red mud leachate can be removed by combining a high-salt biochemical reaction unit with a solid-liquid separation unit; by setting a catalytic unit, the organic matter in the red mud leachate is oxidized and decomposed into CO2 and H2O under the action of a manganese-based catalyst, thereby reducing the COD content and achieving efficient removal of COD in the red mud leachate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1A schematic diagram of the structure provided by the utility model;

[0017] Figure 2 A schematic diagram of the structure provided by the utility model;

[0018] Figure 3 This is a structural diagram provided by the utility model.

[0019] Among them: 1 is the pretreatment unit; 2 is the high-salt biochemical reaction unit; 3 is the catalytic unit; 4 is the ozone catalytic oxidation tower; 5 is the deoxygenation unit; 6 is the sludge treatment unit; 7 is the solid-liquid separation group; 8 is the homogenizer; 9 is the stirring tank; 10 is the desulfurization tank; 11 is the neutralization tank; 12 is the solid-liquid separator; 13 is the mixer; 14 is the catalytic carrier; 15 is the impregnation tank; 16 is the roasting furnace; 17 is the active ingredient; 18 is the ozone tank; 19 is the ozone concentration detection; 20 is the thermometer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-3 The present invention discloses a device for deep treatment of red mud leachate by ozone catalytic oxidation, comprising:

[0022] A pretreatment unit 1 for pretreating red mud leachate, a high-salt biochemical reaction unit 2, a catalytic unit 3 for preparing a manganese-based catalyst, and an ozone catalytic oxidation tower 4 for ozone catalytic oxidation of red mud leachate are sequentially connected. The ozone catalytic oxidation tower 4 is provided with a deoxygenation unit 5 and also includes a sludge treatment unit 6 respectively connected to the pretreatment unit 1 and the high-salt biochemical reaction unit 2; the high-salt biochemical reaction unit 2 cooperates with the pretreatment unit 1 to effectively remove COD and sulfide in the red mud leachate wastewater; by providing the sludge treatment unit 6, the sludge separated from the pretreatment unit 1 and the high-salt biochemical reaction unit 2 is centrally treated, which is beneficial to preventing environmental pollution.

[0023] In this embodiment, the pretreatment unit 1 includes a solid-liquid separation group 7 and a homogenizer 8. The solid-liquid separation group 7 includes a stirring tank 9, a desulfurization tank 10 and a neutralization tank 11 connected in sequence. A stirrer 12 is provided in the stirring tank 9 and the desulfurization tank 10. The stirrer 12 in the stirring tank 9 is arranged at the top, and the stirrer 12 in the desulfurization tank 10 is arranged at the bottom. A solid-liquid separator 13 is provided on the top of the neutralization tank 11. The bottom of the desulfurization tank 10 is connected to the solid-liquid separator 13 at the top of the neutralization tank 11. The end of the neutralization tank 11 away from the desulfurization tank 10 is connected to the homogenizer 8. The neutralization tank 11 and the homogenizer 8 are connected. They are all connected to the sludge treatment unit 6; the stirring tank 9 first receives the red mud leachate and performs sufficient mixing and stirring, and then discharges the mixed and stirred red mud leachate into the desulfurization tank 10, by adding polyferrous sulfate and continuing to stir to make the ferrous sulfate and the red mud leachate fully mixed and reacted, which can effectively flocculate most of the sulfides in the red mud leachate to achieve the purpose of desulfurization, so as to be separated by the solid-liquid separator 13; after receiving the red mud leachate after the sludge is separated, the neutralization tank 11 adjusts the pH value to 7-10, and then discharges it into the high-salt biochemical reaction unit 2 for further biochemical treatment.

[0024] In this embodiment, the catalytic unit 3 is provided with a catalytic carrier 14, an impregnation tank 15 and a roasting furnace 16. The active component 17 is set in the impregnation tank 15, and the catalytic carrier 14 is in full contact with the active component 17; the catalytic carrier 14 is immersed in the impregnation tank 15 filled with the active component 17, and equal volume impregnation is performed to obtain an impregnated carrier; the impregnated carrier is roasted to obtain a manganese-based catalyst.

[0025] In this embodiment, a manganese-based catalyst is provided in the ozone catalytic oxidation tower 4, and the filling rate of the manganese-based catalyst is 50% to 80% of the volume of the ozone catalytic oxidation tower 4; the organic matter in the red mud leachate is decomposed into CO2 and H2O by the manganese-based catalyst, thereby increasing the reaction rate and reducing the COD content, thereby achieving a more efficient COD removal effect.

[0026] In this embodiment, an ozone tank 18 is further included. The ozone tank 18 is connected to the ozone catalytic oxidation tower 4, and the ozone tank 18 is connected to the interior of the ozone catalytic oxidation tower 4 located below the manganese-based catalyst. An ozone concentration detector 19 is provided on the connecting pipeline between the ozone tank 18 and the ozone catalytic oxidation tower 4; ozone is introduced into the ozone catalytic oxidation tower 4 through the ozone tank 18, and the concentration of the introduced ozone is measured through the ozone concentration detector 19.

[0027] In this embodiment, a thermometer 20 is further included. The thermometer 20 is disposed on the baking furnace 16. The temperature of the baking furnace 16 is detected by the thermometer 20 to control the temperature of the impregnated carrier during baking.

[0028] In addition, in this embodiment, the active component 17 includes manganese dioxide and or manganese hydroxide;

[0029] The catalytic carrier 14 is configured to be one or more of activated alumina, silica, activated carbon, zeolite, molecular sieve, diatomaceous earth and zirconia.

[0030] The concentration of ozone introduced into the ozone catalytic oxidation tower 4 is 60-100 mg / L.

[0031] The calcination temperature is 350-600°C and the calcination time is 2-5 hours.

[0032] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0033] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A red mud leachate ozone catalytic oxidation deep treatment device, characterized in that: The invention comprises a pretreatment unit for pretreating red mud leachate, a high-salt biochemical reaction unit, a catalytic unit for preparing a manganese-based catalyst, and an ozone catalytic oxidation tower for ozone catalytic oxidation of the red mud leachate, which are connected in sequence. The ozone catalytic oxidation tower is provided with a deoxygenation unit and also comprises a sludge treatment unit respectively connected to the pretreatment unit and the high-salt biochemical reaction unit.

2. The red mud leachate ozone catalytic oxidation deep treatment device according to claim 1, characterized in that: The pretreatment unit includes a solid-liquid separation group and a homogenizer. The solid-liquid separation group includes a stirring tank, a desulfurization tank and a neutralization tank that are connected in sequence. Agitators are provided in the stirring tank and the desulfurization tank. The agitator located in the stirring tank is arranged at the top, and the agitator located in the desulfurization tank is arranged at the bottom. A solid-liquid separator is provided at the top of the neutralization tank. The bottom of the desulfurization tank is connected to the solid-liquid separator at the top of the neutralization tank. The end of the neutralization tank away from the desulfurization tank is connected to the homogenizer. The neutralization tank and the homogenizer are both connected to the sludge treatment unit.

3. The red mud leachate ozone catalytic oxidation deep treatment device according to claim 1, characterized in that: The catalytic unit is provided with a catalytic carrier, an immersion tank and a baking furnace. Active components are arranged in the immersion tank, and the catalytic carrier is in complete contact with the active components.

4. The red mud leachate ozone catalytic oxidation deep treatment device according to claim 3, characterized in that: A manganese-based catalyst is arranged in the ozone catalytic oxidation tower, and the filling rate of the manganese-based catalyst is 50% to 80% of the volume of the ozone catalytic oxidation tower.

5. The red mud leachate ozone catalytic oxidation deep treatment device according to claim 4, characterized in that: It also includes an ozone tank, which is connected to the ozone catalytic oxidation tower and the inside of the ozone catalytic oxidation tower located below the manganese-based catalyst. An ozone concentration detector is provided on the connecting pipeline between the ozone tank and the ozone catalytic oxidation tower.

6. The red mud leachate ozone catalytic oxidation deep treatment device according to claim 3, characterized in that: The invention also comprises a thermometer, which is arranged on the baking oven.

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