Soil leaching equipment suitable for treating and repairing bottom mud of heavy metal polluted river in mining area

Abstract

The invention discloses soil leaching equipment suitable for treatment and remediation of heavy metal polluted river sediment in a mining area, and belongs to the technical field of soil remediation. The soil leaching equipment comprises a horizontally-arranged filter box, and a feeding hopper is arranged at the top of the filter box; a soil filtering assembly is arranged in the filtering box, and the soil filtering assembly is rotationally connected with the filtering box; a leaching box in sliding fit is arranged at the bottom of the filtering box, and a filtering moving assembly for driving the filtering box to move left and right is arranged at the top of the leaching box; a soil spraying assembly is arranged in the leaching box, the soil spraying assembly is rotationally connected with the leaching box, and a first mixing assembly and a second mixing assembly which are used for turning over soil are further arranged in the leaching box; and a separation box is arranged at the bottom of the leaching box. In the process of repairing the soil in the river sediment, the soil can be better mixed and stirred with the leacheate, so that the soil treatment and repairing effect is better.

Description

Technical Field

[0001] The invention belongs to the technical field of soil remediation, and in particular relates to a soil leaching device suitable for the treatment and remediation of riverbed mud polluted by heavy metals in mining areas. Background Art

[0002] In mining areas, a large amount of heavy metals are released into the environment due to long-term mining, ore dressing and smelting activities. These heavy metals will enter the river through rainwater erosion, surface runoff and other means, polluting the riverbed mud. Heavy metal pollution is characterized by persistence, toxicity and difficulty in degradation, posing a serious threat to the ecological environment and human health.

[0003] For example, heavy metals such as lead, mercury, cadmium, and chromium accumulate in sediments, which may affect the growth and reproduction of aquatic organisms and disrupt the balance of the aquatic ecosystem. At the same time, when the content of heavy metals in sediments exceeds a certain limit, they may be transmitted through the food chain and eventually enter the human body, causing various diseases.

[0004] As people's awareness of environmental protection continues to increase, the need for the treatment of heavy metal-contaminated riverbed mud in mining areas is becoming increasingly urgent. However, the existing soil leaching equipment on the market still has some problems and challenges when used in the treatment and remediation of heavy metal-contaminated riverbed mud in mining areas.

[0005] When the soil is leached and repaired, the leaching liquid is easily mixed with the soil, which may cause uneven stirring. The soil cannot be effectively broken up and crushed, resulting in lumps in the soil, affecting the soil repair and management work. Summary of the invention

[0006] The embodiment of the present invention provides a soil leaching device suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas, so as to solve the problems in the prior art.

[0007] The embodiment of the present invention adopts the following technical scheme: a soil leaching equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas, comprising a horizontally arranged filter box, a feed hopper is provided on the top of the filter box; a soil filter assembly is provided in the filter box, and the soil filter assembly is rotatably connected to the filter box; a sliding leaching box is provided at the bottom of the filter box, and a filter moving assembly is provided on the top of the leaching box for driving the filter box to move left and right; a soil spraying assembly is provided in the leaching box, and the soil spraying assembly is rotatably connected to the leaching box, and a first mixing assembly and a second mixing assembly for turning the soil are also provided in the leaching box; a separation box is provided at the bottom of the leaching box.

[0008] In the process of mixing soil and eluent, different soil characteristics can be applied to optimize the leaching effect. Different mixing methods can promote the uniform mixing of soil and eluent from different angles; different mixing methods can affect the reaction rate between the eluent and pollutants in the soil.

[0009] A further technical solution is that the soil filter assembly includes a rotating rod, a rotating motor and a crushing auger frame, the crushing auger frame is horizontally rotatably connected in the filter box, the rotating motor is located on the side wall of the filter box and is transmission-connected to the crushing auger frame, the bottom of the filter box is provided with three rows of discharge holes arranged at equal intervals, the rotating rod is provided with three, and the three rotating rods are respectively rotatably connected to the bottom of the filter box at equal intervals, a rotating blade is provided on the rotating rod in each discharge hole, a lower sprocket is provided at the end of the rotating rod, an upper sprocket is provided at the end of the crushing auger frame, and a chain is sleeved between the upper sprocket and the lower sprocket.

[0010] According to a further technical solution, the filtering moving assembly includes two moving parts symmetrically arranged on the top of the washing box, each of the moving parts includes a moving motor, a moving gear is provided on the main shaft of the moving motor, and slides are provided at both ends of the filter box, and a moving tooth plate meshing with the moving gear is provided on the slides.

[0011] According to a further technical solution, rubber corrugated plates are provided between the two ends of the filter box and the rinsing box.

[0012] A further technical solution is that two soil spray assemblies are provided, and the two soil spray assemblies are symmetrically arranged on the elution box. The soil spray assembly includes a driving motor, a driving shaft, a driving frame and a spray pipe. The driving shaft is rotatably connected to the elution box, the driving frame is located on the driving shaft, the driving motor is located on the outer wall of the elution box and is transmission-connected to the driving shaft, and the spray pipe is located on the driving frame.

[0013] According to a further technical solution, the inner bottom of the washing box is an inclined structure, and a discharge port is provided at the bottom of the washing box.

[0014] According to a further technical solution, the first mixing assembly includes three mixing auger frames and three mixing motors. The three mixing auger frames are rotatably arranged at the inclined structure of the rinsing box. The mixing motor is located on the side wall of the rinsing box. The main shaft of the mixing motor is transmission-connected to the mixing auger frames.

[0015] According to a further technical solution, the second mixing assembly includes an air pump, an air pipe and a plurality of air stones, wherein the air stones are arranged at equal intervals at an inclined structure in the elution box, the air pump is located in the elution box, and both ends of the air pipe are respectively connected to the air pump and the plurality of air stones.

[0016] According to a further technical solution, a horizontally arranged drain plate is provided in the separation box.

[0017] According to a further technical solution, the separation box is provided with a hinged rotating door located at the drain plate.

[0018] At least one of the above technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0019] Firstly, after the soil containing heavy metals is transported to the filter box through the feed hopper, the rotating motor drives the crushing auger frame to rotate in the filter box, so that the crushing auger frame performs preliminary crushing work on the soil, and breaks larger soil blocks into smaller soil blocks. When the crushing auger frame rotates, it drives the upper sprocket to rotate, thereby driving the three lower sprockets to rotate through the chain, so that the three rotating rods rotate at the bottom of the filter box. The rotation of the rotating rods drives the corresponding rotating blades to rotate in the corresponding discharge holes, and the smaller soil is crushed again. In the process of crushing the soil, the soil can be crushed step by step. After the soil is crushed, it is beneficial to mix the subsequent soil with the eluent, so as to repair and treat the heavy metals in the soil.

[0020] Secondly, the present invention is provided with a first mixing component and a second mixing component. In the process of mixing the soil and the eluent, different soil characteristics can be applied to optimize the elution effect. Different mixing methods can promote the uniform mixing of the soil and the eluent from different angles; different mixing methods can affect the reaction rate between the eluent and the pollutants in the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the filter box in the present invention;

[0024] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0025] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the soil filter assembly in the present invention;

[0027] Figure 6 It is a three-dimensional structural cross-sectional view of the elution box in the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the soil spraying assembly in the present invention;

[0029] Figure 8 is a schematic diagram of the three-dimensional structure of the second mixing component in the present invention;

[0030] Fig. 9 It is a three-dimensional structural schematic diagram of the separation box in the present invention;

[0031] Reference numerals

[0032] Filter box 10, feed hopper 101, discharge hole 102, slide plate 103, rubber corrugated plate 104, rinse box 11, discharge port 110, separation box 12, drain plate 121, rotating door 122, soil filter assembly 2, rotating rod 20, rotating motor 21, crushing auger frame 22, rotating blade 23, upper sprocket 24, lower sprocket 25, chain 26, filter moving assembly 3, moving motor 31, moving gear 32, moving tooth plate 33, soil spraying assembly 4, drive motor 41, drive shaft 42, drive frame 43, spray pipe 44, first mixing assembly 5, mixing auger frame 51, mixing motor 52, second mixing assembly 6, air pump 61, air pipe 62, bubble stone 63. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments 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 work are within the scope of protection of the present invention.

[0034] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] Reference Figures 1 to 9As shown, an embodiment of the present invention provides a soil leaching device suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas, comprising a horizontally arranged filter box 10, wherein a feed hopper 101 is provided on the top of the filter box 10; a soil filter assembly 2 is provided in the filter box 10, and the soil filter assembly 2 is rotatably connected to the filter box 10; a slidingly matched leaching box 11 is provided at the bottom of the filter box 10, and a filter moving assembly 3 for driving the filter box 10 to move left and right is provided on the top of the leaching box 11; a soil spraying assembly 4 is provided in the leaching box 11, and the soil spraying assembly 4 is rotatably connected to the leaching box 11, and a first mixing assembly 5 and a second mixing assembly 6 for turning the soil are also provided in the leaching box 11; a separation box 12 is provided at the bottom of the leaching box 11.

[0036] As a better technical solution in the present application, the soil filter assembly 2 includes a rotating rod 20, a rotating motor 21 and a crushing auger frame 22. The crushing auger frame 22 is horizontally rotatably connected in the filter box 10. The rotating motor 21 is located on the side wall of the filter box 10 and the rotating motor 21 is transmission-connected to the crushing auger frame 22. The bottom of the filter box 10 is provided with three rows of discharge holes 102 arranged at equal intervals. There are three rotating rods 20, and the three rotating rods 20 are respectively rotatably connected to the bottom of the filter box 10 at equal intervals. A rotating blade 23 is provided on the rotating rod 20 in each discharge hole 102, and a lower sprocket 25 is provided at the end of the rotating rod 20. An upper sprocket 24 is provided at the end of the crushing auger frame 22, and a chain 26 is sleeved between the upper sprocket 24 and the lower sprocket 25.

[0037] After the soil containing heavy metals is transported to the filter box 10 through the feed hopper 101, the rotating motor 21 drives the crushing auger frame 22 to rotate in the filter box 10, so that the crushing auger frame 22 performs preliminary crushing work on the soil, and crushes larger soil blocks into smaller soil blocks. When the crushing auger frame 22 rotates, it will drive the upper sprocket wheel 24 to rotate, thereby driving the three lower sprocket wheels 25 to rotate through the chain 26, so that the three rotating rods 20 rotate at the bottom of the filter box 10. The rotation of the rotating rod 20 will drive the corresponding rotating blade 23 to rotate in the corresponding discharge hole 102, and once again crush the smaller soil. After the soil is crushed, it is beneficial to mix the subsequent soil with the eluent, and repair and treat the heavy metals in the soil;

[0038] In the process of crushing the soil, the agglomerated soil can be crushed step by step to increase the contact area: the step-by-step crushing makes the soil particles smaller, thereby greatly increasing the contact area between the soil and the eluent. In the mixing process, more soil particle surfaces can be fully contacted with the eluent, ensuring that each particle can be effectively eluted and improving the uniformity of mixing.

[0039] Promote penetration: The pores between fine soil particles are smaller, and the eluent can penetrate into the soil more easily. This allows the eluent to react more deeply with pollutants such as heavy metals in the soil, improving the elution effect; the crushed soil particles are easier to handle in the subsequent separation and treatment process.

[0040] As soil particles become smaller, the reaction between the eluent and the pollutants is accelerated. The pollutants can be absorbed and desorbed from the soil particles more quickly and enter the eluent, thus shortening the time required for the elution process and improving the elution efficiency.

[0041] During the crushing process, different soil types can be targeted:

[0042] For cohesive soil: Cohesive soil usually has large aggregates and is not easy to mix evenly with the eluent. Step-by-step crushing can effectively break up the aggregates of cohesive soil, disperse the soil particles, and improve the mixing effect with the eluent.

[0043] Treatment of hard soil: For hard soil containing many stones or lumps, step-by-step crushing can break it into smaller particles, which is convenient for the leaching process. At the same time, the crushed soil particles are more easily penetrated by the leaching liquid, which improves the removal effect of pollutants in hard soil.

[0044] The soil filtering assembly 2 can achieve distributed crushing of the soil during the crushing process, so that the crushing effect of the soil is better for subsequent soil restoration and management.

[0045] As a better technical solution in the present application, the filtering moving assembly 3 includes two moving parts symmetrically arranged on the top of the washing box 11, each of the moving parts includes a moving motor 31, and a moving gear 32 is provided on the main shaft of the moving motor 31. Both ends of the filter box 10 are provided with a slide plate 103, and the slide plate 103 is provided with a moving tooth plate 33 meshing with the moving gear 32.

[0046] In the process of breaking up the lumps or large pieces of soil in the soil, the moving motor 31 on the two moving parts drives the moving gear 32 to move on the moving tooth plate 33 on the slide plate 103, thereby driving the filter box 10 to move horizontally on the elution box 11, so that the soil can be better discharged from the discharge hole 102 to the outside, and the soil will not fail to move downward from the discharge hole 102 due to mutual squeezing between the soils. When the filter box 10 moves horizontally left and right on the elution box 11, the broken soil can be smoothly discharged from the discharge hole 102 to the outside.

[0047] As a better technical solution in the present application, a rubber corrugated plate 104 is provided between the two ends of the filter box 10 and the rinsing box 11; the rubber corrugated plate 104 prevents the filtered soil from overflowing when the rinsing box 11 moves horizontally, and the rubber corrugated plate 104 can move along with the movement of the filter box 10 when the filter box 10 moves left and right.

[0048] As a better technical solution in the present application, two soil spray assemblies 4 are provided, and the two soil spray assemblies 4 are symmetrically arranged on the elution box 11. The soil spray assembly 4 includes a driving motor 41, a driving shaft 42, a driving frame 43 and a spray pipe 44. The driving shaft 42 is rotatably connected to the elution box 11, and the driving frame 43 is located on the driving shaft 42. The driving motor 41 is located on the outer wall of the elution box 11 and is transmission-connected to the driving shaft 42, and the spray pipe 44 is located on the driving frame 43.

[0049] It should be noted that the eluent is ethylenediaminetetraacetic acid with a mass fraction concentration of 5%.

[0050] As a preferred technical solution in the present application, the inner bottom of the elution box 11 is an inclined structure, and a discharge port 110 is provided at the bottom of the elution box 11 .

[0051] The inclined structure allows the soil to move to one side after entering the rinsing box 11 , so that the soil moves from the discharge port 110 to the separation box 12 .

[0052] As a better technical solution in the present application, the first mixing assembly 5 includes three mixing auger frames 51 and three mixing motors 52. The three mixing auger frames 51 are rotatably arranged at the inclined structure of the rinsing box 11. The mixing motor 52 is located on the side wall of the rinsing box 11. The main shaft of the mixing motor 52 is transmission-connected to the mixing auger frames 51.

[0053] During the process of leaching the soil, the three mixing motors 52 work respectively to drive the three mixing auger frames 51 to rotate, turning the soil so that the soil and the leaching liquid are fully mixed;

[0054] First, the mixing auger 51 can make the soil and the eluent fully contact and mix in three-dimensional space. Through the rotation of the mixing auger 51, the soil particles are constantly turned and stirred, and evenly mixed with the eluent, ensuring that each soil particle can fully react with the eluent, thereby improving the uniformity of mixing; the efficient stirring action of the mixing auger 51 can achieve full mixing of the soil and the eluent in a relatively short time. Compared with traditional mixing methods, such as manual stirring or simple mechanical stirring, the mixing auger 51 can significantly shorten the mixing time and improve work efficiency.

[0055] During the mixing process, accurate metering can be achieved by controlling the feed amount of soil and eluent. The mixing auger frame 51 can ensure that the soil and eluent are mixed in a predetermined ratio, ensuring the stability and reliability of the elution effect; During the mixing process, accurate metering can be achieved by controlling the feed amount of soil and eluent. The mixing auger frame 51 can ensure that the soil and eluent are mixed in a predetermined ratio, ensuring the stability and reliability of the elution effect.

[0056] The mixing auger frame 51 has good adaptability to different types of soil. Whether it is clay soil, sandy soil or loam, the mixing auger frame 51 can effectively mix it with the eluent. At the same time, for soil particles with different particle sizes, the mixing auger frame 51 can also achieve a good mixing effect.

[0057] In the process of turning the soil, the soil can also be loosened to allow better subsequent air penetration, so that the leachate can be mixed with the soil and the soil can be repaired better.

[0058] As a better technical solution in the present application, the second mixing assembly 6 includes an air pump 61, an air pipe 62 and a plurality of bubble stones 63, wherein the plurality of bubble stones 63 are arranged at equal intervals at the inclined structure in the elution box 11, the air pump 61 is located in the elution box 11, and the two ends of the air pipe 62 are respectively connected to the air pump 61 and the plurality of bubble stones 63.

[0059] During use, start the air pump 61, adjust the air flow and pressure. At the beginning, you can start with a smaller flow rate to observe the reaction of the soil, and then gradually adjust to appropriate parameters according to actual conditions. The air pump 61 works to transport the gas through the air pipe 62 to a number of bubble stones 63, and the bubble stones 63 transport the air into the soil, thereby turning and stirring the soil, mixing the soil and the eluent, and better repairing the soil.

[0060] During use, when air is used to mix the soil and the eluent, the gentle air agitation has little impact on the microbial community in the soil. Many soil microorganisms play a key role in the ecosystem, such as decomposing organic matter and promoting nutrient cycling. By reducing interference with microorganisms, air agitation helps maintain the balance and stability of the soil ecosystem.

[0061] All-round contact: Air stirring generates bubbles, which allows the eluent to fully contact the soil particles in all directions. The bubbles drive the eluent to flow during the rising process, forming a complex flow field to ensure that the soil particles can be evenly mixed with the eluent. This all-round contact improves the elution efficiency and allows pollutants such as heavy metals to be more effectively separated from the soil.

[0062] Increased reaction surface area: The presence of bubbles increases the reaction surface area between the soil and the eluent. The bubbles shuttle between the soil particles, allowing the eluent to better penetrate the soil pores and fully react with the pollutants. This not only increases the elution rate, but also enhances the removal effect of difficult-to-remove pollutants.

[0063] As a preferred technical solution in the present application, a horizontally arranged drain plate 121 is provided in the separation box 12; after the soil is washed, the water in the soil is drained through the drain plate 121.

[0064] As a preferred technical solution in the present application, the separation box 12 is provided with a hinged rotating door 122 at the drain plate 121; after draining the water in the washed soil, the rotating door 122 can be opened to discharge the soil outward.

[0065] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A soil washing device suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas, characterized in that: It comprises a filter box (10) arranged horizontally, wherein a feed hopper (101) is arranged on the top of the filter box (10); A soil filter assembly (2) is provided in the filter box (10), and the soil filter assembly (2) is rotatably connected to the filter box (10); The bottom of the filter box (10) is provided with a slidably matched rinse box (11), and the top of the rinse box (11) is provided with a filter moving assembly (3) for driving the filter box (10) to move left and right; A soil spraying assembly (4) is provided in the washing box (11), and the soil spraying assembly (4) is rotatably connected to the washing box (11); The washing box (11) is also provided with a first mixing component (5) and a second mixing component (6) for turning the soil; A separation box (12) is provided at the bottom of the elution box (11).

2. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 1 is characterized by: The soil filtering assembly (2) comprises a rotating rod (20), a rotating motor (21) and a crushing auger frame (22); The crushing auger frame (22) is horizontally rotatably connected in the filter box (10), the rotating motor (21) is located on the side wall of the filter box (10), and the rotating motor (21) is transmission-connected to the crushing auger frame (22); The bottom of the filter box (10) is provided with three rows of discharge holes (102) arranged at equal intervals; There are three rotating rods (20), and the three rotating rods (20) are rotatably connected to the bottom of the filter box (10) at equal intervals. A rotating blade (23) is provided on the rotating rod (20) in each discharge hole (102), a lower sprocket (25) is provided at the end of the rotating rod (20), an upper sprocket (24) is provided at the end of the crushing auger frame (22), and a chain (26) is sleeved between the upper sprocket (24) and the lower sprocket (25).

3. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 1 is characterized by: The filtering moving assembly (3) comprises two moving parts symmetrically arranged on the top of the elution box (11), each of the moving parts comprises a moving motor (31), and a moving gear (32) is provided on the main shaft of the moving motor (31); Both ends of the filter box (10) are provided with a slide plate (103), and the slide plate (103) is provided with a moving tooth plate (33) meshing with a moving gear (32).

4. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 2 is characterized by: Rubber corrugated plates (104) are provided between the two ends of the filter box (10) and the rinse box (11).

5. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 1 is characterized by: The soil spraying components (4) are provided with two, and the two soil spraying components (4) are symmetrically arranged on the washing box (11); The soil spraying assembly (4) comprises a driving motor (41), a driving shaft (42), a driving frame (43) and a spraying pipe (44); the driving shaft (42) is rotatably connected to the washing box (11); and the driving frame (43) is located on the driving shaft (42); The driving motor (41) is located on the outer wall of the washing box (11) and is drivingly connected to the driving shaft (42), and the spraying pipeline (44) is located on the driving frame (43).

6. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 1 is characterized by: The inner bottom of the elution box (11) is an inclined structure, and a discharge port (110) is provided at the bottom of the elution box (11).

7. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 6 is characterized by: The first mixing assembly (5) comprises three mixing auger frames (51) and three mixing motors (52); Three mixing auger frames (51) are rotatably arranged at the inclined structure of the rinsing box (11), the mixing motor (52) is located on the side wall of the rinsing box (11), and the main shaft of the mixing motor (52) is transmission-connected to the mixing auger frames (51).

8. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 6 is characterized by: The second mixing assembly (6) comprises an air pump (61), an air pipe (62) and a plurality of air stones (63); The plurality of air stones (63) are arranged at equal intervals at an inclined structure in the elution box (11), the air pump (61) is located in the elution box (11), and the two ends of the air pipe (62) are respectively connected to the air pump (61) and the plurality of air stones (63).

9. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 1 is characterized by: A horizontally arranged drain plate (121) is provided in the separation box (12).

10. The soil washing equipment suitable for the treatment and restoration of riverbed mud contaminated by heavy metals in mining areas according to claim 9 is characterized in that: The separation box (12) is provided with a hinged rotating door (122) located at the drain plate (121).

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