Device for efficiently removing COD (Chemical Oxygen Demand) in red mud leachate
By integrating the flocculation tank and the COD mixed removal tank into a design, and combining a stirring unit and a multi-layer packing layer, the ozone oxidation reaction was optimized, solving the problems of large footprint and low reaction efficiency in existing technologies, and achieving efficient removal of COD from red mud leachate.
Patent Information
- Application Number
- CN202422712820.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Existing ozone oxidation towers lack multi-stage series operation, resulting in increased floor space and a lack of stirring function, which affects the efficiency of the chemical reaction between ozone and leachate and makes it impossible to effectively remove COD from red mud leachate.
A device for efficiently removing COD from red mud leachate was designed, which integrates a flocculation tank and a COD mixing and removal tank. It is equipped with a mixing auxiliary stirring unit and an aeration main stirring unit. The inner tank is filled with inclined plate packing layer, catalyst packing layer and activated carbon packing layer. The stirring unit enhances the reaction effect, and the reaction process is optimized by using an ozone microporous diffuser and a tail gas recirculation component.
It improves the COD removal efficiency in leachate, reduces the floor space required, enhances the stirring and mixing function, increases the reaction rate, and reduces costs.
Smart Images
Figure CN223522378U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sewage treatment technical field especially relates to a device of high efficiency removal COD in red mud percolate. BACKGROUND
[0002] Red mud is solid or semi-solid powder mud solid waste produced by alumina industry, and it is rich in trivalent iron ions and presents red or red-brown color. Red mud produces percolate when it is stored, and the main components of red mud percolate are water and compounds containing aluminum ions, such as aluminum hydroxide, aluminate, etc. The alkali content of red mud percolate is very high, and if it leaks, it will cause serious water pollution and soil pollution, so it cannot be directly discharged into the surrounding natural water body. At present, the alumina plant generally collects the red mud percolate for recycling or pumps it back to the top of the stockpile for natural evaporation. However, once extreme weather such as heavy rain occurs, the amount of red mud percolate increases sharply, which brings high environmental risk to the surrounding area of the red mud stockpile. Therefore, effective COD removal operation is needed for the red mud percolate to make it meet the discharge standard and completely eliminate the pollution risk of the red mud percolate.
[0003] Ozone oxidation is a treatment method that is more and more widely used in the treatment of COD at present, but the existing ozone oxidation tower does not have the function of multi-stage series connection, thereby increasing the number of ozone oxidation towers, and further increasing the land occupation area of the ozone oxidation tower and the economic benefit, and at the same time, it does not have the function of stirring, so that the ozone and the percolate cannot fully react, thereby reducing the COD removal efficiency.
[0004] How to develop a device for efficiently removing COD in red mud percolate, so that the pretreatment function and the COD removal function are integrated, the land occupation area is reduced, the stirring and mixing functions are increased, the ozone and the percolate fully react, and other COD auxiliary removal units are connected in series to improve the removal efficiency, which has become a technical problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a device for efficiently removing COD in red mud percolate, and solving the problems listed in the background art.
[0006] To solve the above technical problems, the utility model adopts the following technical scheme:
[0007] The utility model relates to a device for efficiently removing COD in red mud percolate, which comprises an outer shell and an inner container, the lower surface of the outer shell and the inner container are in communication with each other, a raw water pipe is communicated on the top outer side wall of the outer shell, a sludge discharge pipe is communicated on the top side wall of the inner container, a flocculation tank is formed between the inner surface of the outer shell and the outer surface of the inner container, and a COD mixing and removal tank is arranged in the inner container.
[0008] A stirring device is installed on the inner side of the top of the shell, and the stirring device comprises a water mixing auxiliary stirring unit and an aeration main stirring unit.
[0009] The water mixing auxiliary stirring unit is arranged in the flocculation tank, and the aeration main stirring unit is arranged in the inner container.
[0010] Preferably, the inner container is sequentially provided with a inclined plate filler layer, a catalyst filler layer and an activated carbon filler layer from bottom to top, and support filter plates are installed on the upper and lower end faces of the inclined plate filler layer, the catalyst filler layer and the activated carbon filler layer, and a second bearing is installed at the center of the support filter plate.
[0011] Preferably, the aeration main stirring unit comprises a main driver and a main stirring shaft, the main driver is installed on the top of the inner surface of the shell through a bracket, the main stirring shaft sequentially penetrates the inclined plate filler layer, the catalyst filler layer and the activated carbon filler layer, and the outer side wall of the main stirring shaft is fixedly connected with the second bearing.
[0012] The main driver is engaged with the main stirring shaft through a bevel gear set.
[0013] Preferably, the main stirring shaft is hollow, and the main stirring shaft is in communication with main stirring rods at the upper and lower ends of the catalyst filler layer, respectively.
[0014] The main stirring rods are arranged on the outer circumferential surface of the main stirring shaft at equal intervals.
[0015] The lower surface of the main stirring rod is in communication with an ozone microporous diffuser.
[0016] Preferably, the upper end of the main stirring shaft penetrates the shell and is in communication with an ozone gas supply pipe through a gas supply assembly; and the lower end of the main stirring shaft is movably installed on the inner wall at the center of the bottom of the inner container through a bearing.
[0017] The top of the inner container is in communication with the side wall of the main stirring shaft through a tail gas reflux assembly.
[0018] Preferably, a mud scraping plate is further included, the mud scraping plate is installed on the outer circumferential surface of the main stirring shaft at equal intervals, and the mud scraping plate abuts against the inner side wall of the inner container.
[0019] Preferably, the water mixing auxiliary stirring unit comprises a mounting plate and a motor, the mounting plate is installed on the outer side wall of the main stirring shaft at equal intervals, the non-working end of the motor is fixedly connected with the lower surface of the mounting plate, and a stirring paddle is installed on the working end of the motor.
[0020] The outer circumferential surface of the motor working end is provided with a conical support, and the tip of the conical support is movably connected with the outer circumferential surface of the stirring paddle through a first bearing.
[0021] Preferably, the air supply assembly comprises a first sealing bearing and a second sealing bearing, the inner ring of the first sealing bearing and the second sealing bearing is fixedly connected with the outer side wall of the main stirring shaft, and the outer ring of the first sealing bearing and the second sealing bearing is provided with a first sealing hem.
[0022] Preferably, the tail gas reflux assembly comprises a third sealing bearing and a fourth sealing bearing, the inner ring of the third sealing bearing and the fourth sealing bearing is fixedly connected with the outer side wall of the main stirring shaft, and the outer ring of the third sealing bearing and the fourth sealing bearing is provided with a second sealing hem.
[0023] The second sealing hem is communicated with the inner container through a tail gas pipe, and a one-way exhaust valve is arranged on the tail gas pipe.
[0024] Compared with the prior art, the device has the beneficial technical effects that:
[0025] The device for efficiently removing COD in red mud leachate has the following advantages: the water mixing auxiliary stirring unit arranged in the flocculation tank formed between the shell and the inner container can make the flocculant fully mixed and stirred in the leachate, accelerate the flocculation and precipitation of the suspended matter in the leachate, and adjust the pH value of the leachate; the aeration main stirring unit arranged in the inner container increases the contact area of ozone and the pretreated leachate, facilitates the full reaction of ozone and the leachate, and improves the removal efficiency of COD in the leachate; meanwhile, the inner container is sequentially provided with a inclined plate filler layer, a catalyst filler layer and an activated carbon filler layer from bottom to top, so that the COD in the leachate can be fully reacted, the tail gas can be harmlessly treated, the reaction rate is improved, and the reaction cost is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0026] The device for efficiently removing COD in red mud leachate will be further described below in combination with the drawings.
[0027] Fig. 1 FIG. 1 is a front view (cutaway) of the device for efficiently removing COD in red mud leachate of the present application;
[0028] Fig. 2 FIG. 2 is an enlarged schematic view of part A of the device for efficiently removing COD in red mud leachate of the present application;
[0029] Fig. 3 FIG. 3 is an enlarged schematic view of part B of the device for efficiently removing COD in red mud leachate of the present application.
[0030] Explanation of reference signs: 1, sludge discharge pipe; 2, shell; 3, inner container; 4, stirring paddle; 5, first bearing; 6, conical support; 7, raw water pipe; 8, motor; 9, mounting plate; 10, main driver; 11, ozone gas supply pipe; 12, main stirring shaft; 13, purified water pipe; 14, activated carbon filler layer; 15, ozone microporous diffuser; 16, catalyst filler layer; 17, support filter plate; 18, second bearing; 19, inclined plate filler layer; 20, sludge scraping plate; 21, first sealing bearing; 22, second sealing bearing; 23, first sealing hem; 24, third sealing bearing; 25, second sealing hem; 26, fourth sealing bearing; 27, one-way exhaust valve; 28, tail gas pipe. DETAILED DESCRIPTION
[0031] In order to make the technical problems, technical schemes and beneficial effects of the utility model clearer, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.
[0032] As shown in Figs. 1-3 A device for efficiently removing COD in red mud leachate, comprising a shell 2 and an inner container 3, the shell 2 and the lower surface of the inner container 3 are in communication with each other, a raw water pipe 7 is communicated on the top outer side wall of the shell 2, a sludge discharge pipe 1 is communicated on the top side wall of the inner container 3, a flocculation tank is formed between the inner surface of the shell 2 and the outer surface of the inner container 3, by adding flocculant inside the flocculation tank, the suspended solids in the leachate are removed, and the pretreatment of the leachate is completed, and a COD mixing and removing tank is arranged inside the inner container 3.
[0033] A stirring device is installed on the top inner side of the shell 2, the stirring device comprises a water mixing auxiliary stirring unit and an aeration main stirring unit.
[0034] The water mixing auxiliary stirring unit is arranged in the flocculation tank, the aeration main stirring unit is arranged inside the inner container 3, one end of a purified water pipe 13 is communicated with the top of the inner container 3, the other end of the purified water pipe 13 is communicated with the side wall of the shell 2, by adding the water mixing auxiliary stirring unit inside the flocculation tank, the flocculant can be fully mixed and stirred in the leachate, the flocculation and precipitation of the suspended solids in the leachate is accelerated, and the pH value of the leachate is adjusted, and by adding the aeration main stirring unit inside the inner container, the contact area of ozone and the pretreated leachate is increased, the ozone and the leachate can fully react, and the removal efficiency of COD in the leachate is improved.
[0035] Further, the pretreatment of leachate and the COD removal of leachate are integrated, which not only reduces the floor area, but also efficiently removes the COD in leachate and improves the working efficiency during the removal of COD.
[0036] Specifically, the inner part of the inner container 3 is sequentially provided from bottom to top with an inclined plate filler layer 19, a catalyst filler layer 16 and an activated carbon filler layer 14, the upper and lower end faces of the inclined plate filler layer 19, the catalyst filler layer 16 and the activated carbon filler layer 14 are provided with support filter plates 17, and the center of each support filter plate 17 is provided with a second bearing 18.
[0037] The aeration main stirring unit comprises a main driver 10 and a main stirring shaft 12, the main driver 10 is mounted on the top of the inner surface of the shell 2 through a bracket, the main stirring shaft 12 sequentially penetrates the inclined plate filler layer 19, the catalyst filler layer 16 and the activated carbon filler layer 14, and the outer side wall of the main stirring shaft 12 is fixedly connected with the second bearing 18; during operation, the leachate sequentially passes through the inclined plate filler layer, the catalyst filler layer and the activated carbon filler layer, so that the COD in the leachate can fully react.
[0038] The main driver 10 is engaged with the main stirring shaft 12 through a bevel gear set.
[0039] The main stirring shaft 12 is hollow, and the main stirring shaft 12 is in communication with a main stirring rod at the upper and lower ends of the catalyst filler layer 16.
[0040] The main stirring rods are arranged at equal intervals on the outer circumferential surface of the main stirring shaft 12.
[0041] The lower surface of the main stirring rod is communicated with an ozone micropore diffuser 15.
[0042] When the pretreated leachate passes through the inclined plate filler layer, the suspended solids in the leachate are further precipitated, and the COD in the leachate is removed at the same time.
[0043] Ozone micropore diffusers are arranged between the inclined plate filler layer and the catalyst filler layer, and between the catalyst filler layer and the activated carbon filler layer, under the rotation of the main stirring shaft, the ozone micropore diffusers on the main stirring rods are driven to fully contact with the COD in the leachate and fully react, and after the catalyst catalyzes the ozone reaction, the leachate passing through the activated carbon filler layer can further remove the COD in the leachate, effectively remove the ozone content in the tail gas, prevent the tail gas from causing secondary pollution to the environment, reduce the reaction time and reduce the reaction cost.
[0044] Specifically, the upper end of the main stirring shaft 12 penetrates the outer shell 2 and is communicated with the ozone supply pipe 11 through the air supply assembly. Ozone passes through the ozone microporous diffuser through the internal space of the main stirring shaft and the main stirring rod, and is introduced into the percolate during stirring, so that the small ozone bubbles fully react with the COD in the percolate. The lower end of the main stirring shaft 12 is movably mounted on the bottom center inner wall of the inner container 3 through a bearing;
[0045] The top of the inner container 3 is communicated with the side wall of the main stirring shaft 12 through the tail gas reflux assembly, and the reacted tail gas is continuously passed through the percolate through the tail gas reflux device to participate in the reaction, preventing the tail gas from leaking and polluting the environment.
[0046] Specifically, it further includes a mud scraping plate 20, which is installed on the outer circumferential surface of the main stirring shaft 12 at equal intervals, and the mud scraping plate 20 abuts against the inner side wall of the inner container 3, which can scrape off the attached red mud on the inner container, prevent the red mud from being deposited too much to block the water passing through the through hole between the outer shell and the inner container, and the scraping operation of the mud scraping plate can further loosen the red mud deposited at the bottom of the inner container, facilitating the red mud to be discharged through the mud discharge pipe.
[0047] Specifically, the water mixing auxiliary stirring unit includes a mounting plate 9 and a motor 8, the mounting plate 9 is installed on the outer side wall of the main stirring shaft 12 at equal intervals, the lower part of the mounting plate 9 is fixedly connected with the non-working end of the motor 8, and the working end of the motor 8 is provided with a stirring paddle 4;
[0048] A conical bracket 6 is installed on the outer circumferential surface of the working end of the motor 8, and the tip of the conical bracket 6 is movably connected with the outer circumferential surface of the stirring paddle 4 through a first bearing 5;
[0049] The stirring paddle can not only revolve by the driving of the mounting plate, but also can be self-transmitted by the driving of the motor, so that the percolate is fully stirred and mixed with the flocculating agent in the flocculation tank, the sedimentation efficiency and effect of the suspended matter in the percolate are increased, and the pH value of the percolate is fully adjusted to improve the solubility and oxidation efficiency of ozone;
[0050] Further, the conical bracket can ensure the structural stability of the stirring paddle during work, and improve the service life of the stirring paddle.
[0051] Specifically, the gas supply assembly includes a first sealing bearing 21 and a second sealing bearing 22, inner rings of the first sealing bearing 21 and the second sealing bearing 22 are fixedly connected with the outer side wall of the main stirring shaft 12, outer rings of the first sealing bearing 21 and the second sealing bearing 22 are provided with a first sealing hem 23, the first sealing hem is communicated with the ozone gas supply pipe, and a through hole is formed in the side wall of the main stirring shaft, so that ozone can be introduced into the inside of the main stirring shaft under the condition that the main stirring shaft rotates.
[0052] Specifically, the tail gas reflux assembly includes a third sealing bearing 24 and a fourth sealing bearing 26, inner rings of the third sealing bearing 24 and the fourth sealing bearing 26 are fixedly connected with the outer side wall of the main stirring shaft 12, outer rings of the third sealing bearing 24 and the fourth sealing bearing 26 are provided with a second sealing hem 25.
[0053] The second sealing hem 25 is communicated with the inner container 3 through a tail gas pipe 28, and a one-way exhaust valve 27 is installed on the tail gas pipe 28, so that tail gas can be refluxed into the main stirring shaft to continue to participate in the reaction under the condition that the main stirring shaft rotates, and the one-way exhaust valve limits the movement of ozone from the tail gas pipe to the activated carbon filling layer;
[0054] Further, the ozone flow rate in the main stirring shaft is fast, and the pressure in the main stirring shaft is low, so that the tail gas at the top of the inner container can be sucked by the tail gas reflux assembly and introduced into the leachate to continue to participate in the reaction, which not only avoids the pollution of the environment caused by the exhaust of the purified water pipe, but also reduces the preparation amount of the ozone generator and the energy consumption of the ozone generator.
[0055] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.
[0056] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements of the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.
Claims
1. A device for efficiently removing COD in red mud leachate, comprising an outer shell (2) and an inner container (3), the outer shell (2) and the lower surface of the inner container (3) being in communication with each other, a raw water pipe (7) being communicated on the top outer side wall of the outer shell (2), and a sludge discharge pipe (1) being communicated on the top side wall of the inner container (3), characterized in that: The inner surface of the shell (2) and the outer surface of the inner container (3) form a flocculation tank, and the inner container (3) is internally provided with a COD mixing and removal tank. A stirring device is mounted on the inner side of the top of the shell (2), and the stirring device comprises a water mixing sub-stirring unit and an aeration main stirring unit. The water mixing sub-stirring unit is arranged in the flocculation tank, the aeration main stirring unit is arranged in the inner container (3), the top of the inner container (3) is communicated with one end of a purified water pipe (13), and the other end of the purified water pipe (13) is communicated with the side wall of the shell (2). 2.The device for efficiently removing COD in red mud leachate according to claim 1, characterized in that: The inner container (3) is internally sequentially provided with an inclined plate filler layer (19), a catalyst filler layer (16) and an activated carbon filler layer (14) from bottom to top, support filter plates (17) are mounted on the upper and lower end faces of the inclined plate filler layer (19), the catalyst filler layer (16) and the activated carbon filler layer (14), and a second bearing (18) is mounted at the center of the support filter plate (17).
3. The device for efficiently removing COD in red mud leachate according to claim 2, characterized in that: The aeration main stirring unit comprises a main driver (10) and a main stirring shaft (12), the main driver (10) is mounted on the top of the inner surface of the shell (2) through a bracket, the main stirring shaft (12) sequentially penetrates the inclined plate filler layer (19), the catalyst filler layer (16) and the activated carbon filler layer (14), and the outer side wall of the main stirring shaft (12) is fixedly connected with the second bearing (18). The main driver (10) is engaged with the main stirring shaft (12) through a bevel gear set.
4. The device for efficiently removing COD in red mud leachate according to claim 3, characterized in that: The main stirring shaft (12) is hollow in the inside, and the main stirring shaft (12) is respectively communicated with main stirring rods at the upper and lower ends of the catalyst filler layer (16). The main stirring rods are arranged at equal intervals on the outer circumferential surface of the main stirring shaft (12). An ozone micropore diffuser (15) is communicated with the lower surface of the main stirring rod.
5. The device for efficiently removing COD in red mud leachate according to claim 4, characterized in that: The upper end of the main stirring shaft (12) penetrates the shell (2) and is communicated with an ozone gas supply pipe (11) through a gas supply assembly, and the lower end of the main stirring shaft (12) is movably mounted on the inner wall at the center of the bottom of the inner container (3) through a bearing. The top of the inner container (3) is communicated with the side wall of the main stirring shaft (12) through a tail gas reflux assembly. 6.The device for efficiently removing COD in red mud leachate according to claim 5, characterized in that: A mud scraping plate (20) is also arranged at equal intervals on the outer circumferential surface of the main stirring shaft (12), and the mud scraping plate (20) abuts against the inner side wall of the inner container (3).
7. The device for efficiently removing COD in red mud leachate according to claim 6, characterized in that: The water mixing sub-stirring unit comprises a mounting plate (9) and a motor (8), the mounting plate (9) is arranged at equal intervals on the outer side wall of the main stirring shaft (12), the lower side of the mounting plate (9) is fixedly connected with the non-working end of the motor (8), and the working end of the motor (8) is provided with a stirring paddle (4). A conical support (6) is mounted on the outer circumferential surface of the working end of the motor (8), and the tip of the conical support (6) is movably connected with the outer circumferential surface of the stirring paddle (4) through a first bearing (5). 8.The device for efficiently removing COD in red mud leachate according to claim 5, characterized in that: The air supply assembly comprises a first sealing bearing (21) and a second sealing bearing (22), inner rings of the first sealing bearing (21) and the second sealing bearing (22) are fixedly connected with an outer side wall of the main stirring shaft (12), and outer rings of the first sealing bearing (21) and the second sealing bearing (22) are provided with a first sealing hem (23). 9.The device for efficiently removing COD in red mud leachate according to claim 5, characterized in that: The tail gas reflux assembly comprises a third sealing bearing (24) and a fourth sealing bearing (26), inner rings of the third sealing bearing (24) and the fourth sealing bearing (26) are fixedly connected with the outer side wall of the main stirring shaft (12), and outer rings of the third sealing bearing (24) and the fourth sealing bearing (26) are provided with a second sealing hem (25). The second sealing hem (25) is communicated with the inner container (3) through a tail gas pipe (28), and a one-way exhaust valve (27) is installed on the tail gas pipe (28).