Device for repairing soil petroleum pollution through combination of biochar and exogenous nitrogen

Abstract

The invention discloses a device for repairing petroleum pollution of soil through combination of biochar and exogenous nitrogen, and relates to the technical field of soil repairing. The device comprises a mixing barrel, a barrel cover is movably mounted above the mixing barrel, a first motor is arranged above the barrel cover, a first bevel gear is arranged at the output end of the first motor, the first bevel gear is meshed with a second bevel gear, and the second bevel gear is fixedly mounted on a first transmission wheel; the first transmission wheel is in transmission connection with a second transmission wheel and a third transmission wheel through a transmission belt, rotating rods are fixedly installed on the second transmission wheel and the third transmission wheel, and beating rods are slidably connected into the rotating rods through reset springs. Through transmission of a bevel gear and a transmission wheel, beating and vibration of the first containing box and the second containing box are achieved, and the blocking problem in the discharging process is effectively solved. Meanwhile, through cooperation of an incomplete gear and a first gear, it is ensured that the biochar, the exogenous nitrogen and the soil can uniformly and regularly fall into the mixing barrel, and the mixing efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil remediation, and more particularly, to a device for remediating petroleum-contaminated soil by combining biochar with exogenous nitrogen. Background Art

[0002] Petroleum is an important and indispensable energy source for modern industry. However, during its extraction, refining, storage, and transportation, oil spills and leaks occur frequently, causing serious pollution to the soil environment. Petroleum pollutants include components such as alkanes and aromatic hydrocarbons, among which polycyclic aromatic hydrocarbons (PAHs) are carcinogenic, teratogenic, and mutagenic, posing a serious threat to the ecological environment and public health. Therefore, it is particularly important to study the treatment technologies for petroleum-contaminated soil. As a new type of soil amendment material, biochar has been proven to have the ability to regulate the physical and chemical properties of soil and the microbial community structure, and can effectively improve the bioremediation efficiency of petroleum-contaminated soil. Biochar is a high-polymer carbon product generated by the pyrolysis of biomass under limited oxygen or anaerobic conditions. It has a rich pore structure and surface functional groups, can adsorb pollutants in the soil, and promote the growth and metabolism of microorganisms. However, the lack of nitrogen in petroleum-contaminated soil is a key factor restricting the biodegradation efficiency of petroleum hydrocarbons. To overcome this problem, researchers have tried to combine biochar with exogenous nitrogen to provide the necessary nutrients for microorganisms and enhance the bioremediation effect. However, the influence mechanisms of the type of exogenous nitrogen and the soil carbon-nitrogen ratio (C / N) on the degradation of petroleum hydrocarbons are not yet fully understood, and in practical applications, how to apply exogenous nitrogen efficiently and environmentally friendly is also an urgent problem to be solved.

[0003] In the current devices for remediating petroleum-contaminated soil with biochar, during the mixing process, the method of putting soil and biochar into the stirring device all at once in a predetermined ratio is generally adopted. However, this approach has significant drawbacks: adding a large amount of materials at one time will significantly prolong the mixing time, and at the same time, it is also prone to the problem of uneven mixing. Especially when there is too much material accumulation inside the stirring device, it becomes particularly difficult to achieve sufficient mixing between the sludge and biochar, thus affecting the remediation effect and the final quality of the soil. Summary of the Invention

[0004] In view of the problems in the related art, the present invention provides a device for remediating petroleum-contaminated soil by combining biochar with exogenous nitrogen to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention relates to a device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen, which includes a mixing barrel. A barrel cover is movably installed above the mixing barrel. A first motor is arranged above the barrel cover. The output end of the first motor is provided with a first bevel gear, which meshes with a second bevel gear. The second bevel gear is fixedly installed on a first transmission wheel. The first transmission wheel is connected to a second transmission wheel and a third transmission wheel through a transmission belt. The second transmission wheel and the third transmission wheel are both fixedly installed with rotating rods. Inside the rotating rod, a knocking rod is slidably connected through a return spring. One end of the knocking rod contacts a first placement box and a second placement box. The bottoms of the first placement box and the second placement box are communicated with a first notch. The first notch is communicated with a second notch. The second notch is opened on a first gear. The first gear meshes with an incomplete gear. The incomplete gear is fixedly connected to the first transmission wheel.

[0007] Further, the first motor is fixedly installed above the barrel cover. The first bevel gear is fixedly connected to the output end of the first motor. The first transmission wheel, the second transmission wheel and the third transmission wheel are all rotatably installed on the barrel cover.

[0008] Further, one end of the return spring is fixedly installed inside the rotating rod, and the other end of the return spring is fixedly installed on the knocking rod. The surface of the knocking rod away from the return spring is arc-shaped.

[0009] Further, the first placement box and the second placement box are movably installed on the first notch. The first notch is opened on the barrel cover. The incomplete gear and the two first gears are all rotatably installed on the barrel cover.

[0010] Further, the incomplete gear is fixedly installed with a stirring rod. The stirring rod is fixedly installed with stirring blades and cleaning brushes. The cleaning brushes are attached to the inner wall of the mixing barrel. There are four stirring blades and cleaning brushes in total, divided into two groups. A mixing shaft is fixedly installed between the two stirring blades.

[0011] Further, one end of a connecting rod is fixedly installed on the barrel cover. The other end of the connecting rod passes through the incomplete gear and the stirring rod and is fixedly installed on a crushing box. A second motor is fixedly installed inside the crushing box. The output end of the second motor is fixedly installed with crushing rollers. There are two crushing rollers.

[0012] Further, the two crushing rollers are both rotatably installed inside the crushing box. The two crushing rollers are both fixedly installed with second gears. The two second gears are rotatably installed inside the crushing box, and the two second gears mesh with each other.

[0013] Furthermore, a fixed frame is movably installed inside the crushing box, and a number of grindstones are fixedly installed inside the fixed frame. The number of grindstones corresponds to the blades on the crushing roller.

[0014] Furthermore, a discharge port is opened at the bottom of the mixing barrel, and a number of support legs are fixedly installed on the mixing barrel.

[0015] The present invention has the following beneficial effects compared with the prior art:

[0016] 1. Driven by the first motor and using the transmission of bevel gears and transmission wheels, the present invention realizes the knocking and vibration of the first placement box and the second placement box, effectively preventing the blockage problem during the feeding process. At the same time, the cooperation of the incomplete gear and the first gear ensures that the biochar, exogenous nitrogen, and soil can fall into the mixing barrel evenly and regularly, improving the mixing efficiency and uniformity.

[0017] 2. Through the combination of the stirring rod, stirring blades, and cleaning brushes, the present invention can not only fully stir and mix the biochar and soil in the mixing barrel, but also clean the inner wall of the mixing barrel during the stirring process to prevent material adhesion. While ensuring the mixing effect, it also facilitates subsequent cleaning and maintenance work, improving the use efficiency and lifespan of the equipment.

[0018] 3. The crushing roller driven by the second motor and the design of the second gears meshing with each other in the present invention realize the opposite-direction crushing of the biochar and soil, further improving the uniformity and reactivity of the mixture. In addition, the blades on the crushing roller are polished by the grindstones, which not only prevents the adhesion and dullness of the blades, but also ensures the crushing effect, making the entire repair process more intelligent and efficient.

[0019] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the following drawings.

[0021] Figure 1 is the three-dimensional structure diagram of the present invention;

[0022] Figure 2 is the enlarged view of part A of the present invention;

[0023] Figure 3 is the enlarged view of part B of the present invention;

[0024] Figure 4 Top view of the present invention;

[0025] Figure 5 Exploded view of the rotating rod of the present invention;

[0026] Figure 6 Cross-section of the mixing barrel of the present invention Figure 1 ;

[0027] Figure 7 Cross-section of the mixing barrel of the present invention Figure 2 ;

[0028] Figure 8 Schematic diagram of some parts of the present invention;

[0029] Figure 9 Exploded view of the crushing box of the present invention.

[0030] In the drawings, the list of components represented by each reference numeral is as follows:

[0031] 1. Mixing barrel; 2. Barrel cover; 3. First motor; 4. First bevel gear; 5. Second bevel gear; 6. First transmission wheel; 7. Transmission belt; 8. Second transmission wheel; 9. Third transmission wheel; 10. Rotating rod; 11. Return spring; 12. Knocking rod; 13. First placement box; 14. Second placement box; 15. First notch; 16. Second notch; 17. First gear; 18. Incomplete gear; 19. Stirring rod; 20. Stirring blade; 21. Cleaning brush; 22. Connecting rod; 23. Crushing box; 24. Mixing shaft; 25. Second motor; 26. Crushing roller; 27. Second gear; 28. Fixed frame; 29. Grinding stone; 30. Discharge port; 31. Support leg. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the invention will be clearly and completely described in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the invention.

[0033] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the invention.

[0034] Please refer to Figures 1-9As shown in the figure, the present invention is a device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen, including a mixing barrel 1. A barrel cover 2 is movably installed above the mixing barrel 1. A first motor 3 is arranged above the barrel cover 2. The output end of the first motor 3 is provided with a first bevel gear 4. The first bevel gear 4 meshes with a second bevel gear 5. The second bevel gear 5 is fixedly installed on a first transmission wheel 6. The first transmission wheel 6 is connected to a second transmission wheel 8 and a third transmission wheel 9 through a transmission belt 7. Both the second transmission wheel 8 and the third transmission wheel 9 are fixedly installed with rotating rods 10. Inside the rotating rod 10, a knocking rod 12 is slidably connected through a return spring 11. One end of the knocking rod 12 contacts a first placement box 13 and a second placement box 14. The bottoms of the first placement box 13 and the second placement box 14 communicate with a first notch 15. The first notch 15 communicates with a second notch 16. The second notch 16 is opened on a first gear 17. The first gear 17 meshes with an incomplete gear 18. The incomplete gear 18 is fixedly connected to the first transmission wheel 6.

[0035] The working principle of the device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen proposed by the present invention is as follows. First, the prepared biochar and exogenous nitrogen are added to the first placement box 13, and the soil is added to the inside of the second placement box 14. Subsequently, the first motor 3 is started. The output end of the first motor 3 drives the first bevel gear 4 to rotate, thereby driving the second bevel gear 5 to rotate, and then driving the first transmission wheel 6 to rotate. Thus, the second transmission wheel 8 and the third transmission wheel 9 are driven to rotate through the transmission belt 7, and then the rotating rod 10 is driven to rotate, thereby driving the knocking rod 12 to rotate. Then, the outer walls of the first placement box 13 and the second placement box 14 can be knocked, so that the first placement box 13 and the second placement box 14 vibrate. And by the action of the return spring 11, the knocking rod 12 will not be stuck by the outer walls of the first placement box 13 and the second placement box 14.

[0036] It should be noted that through the rotation of the first transmission wheel 6, the incomplete gear 18 is synchronously driven to rotate, thereby driving the first gear 17 to rotate, and then driving the second notch 16 to rotate. When the second notch 16 coincides with the first notch 15, the biochar, exogenous nitrogen, and soil will fall into the inside of the mixing barrel 1, thereby achieving uniform feeding.

[0037] Furthermore, by knocking the outer walls of the first placement box 13 and the second placement box 14 with the knocking rod 12 to generate vibration, it will not be blocked when feeding. At the same time, according to the setting of the incomplete gear 18, after the incomplete gear 18 rotates a certain number of turns, it will drive the second notch 16 opened on the first gear 17 to coincide with the first notch 15, and then the feeding work is completed.

[0038] In one embodiment, for the above-mentioned first motor 3, the first motor 3 is fixedly installed above the bucket lid 2, the first bevel gear 4 is fixedly connected to the output end of the first motor 3, and the first transmission wheel 6, the second transmission wheel 8, and the third transmission wheel 9 are all rotatably installed on the bucket lid 2.

[0039] In one embodiment, for the above-mentioned rotating rod 10, one end of a return spring 11 is fixedly installed inside the rotating rod 10, the other end of the return spring 11 is fixedly installed on the knocking rod 12, and the surface of the knocking rod 12 away from the return spring 11 is arc-shaped.

[0040] The working principle of a device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen proposed by the present invention is that, by setting one surface of the knocking rod 12 to be arc-shaped and cooperating with the action of the return spring 11, the knocking rod 12 can smoothly pass through the first placement box 13 and the second placement box 14.

[0041] In one embodiment, for the above-mentioned first placement box 13, the first placement box 13 and the second placement box 14 are movably installed on the first notch 15, the first notch 15 is opened on the bucket lid 2, and the incomplete gear 18 and the two first gears 17 are both rotatably installed on the bucket lid 2.

[0042] In one embodiment, for the above-mentioned incomplete gear 18, the incomplete gear 18 is fixedly installed with a stirring rod 19, the stirring rod 19 is fixedly installed with stirring blades 20 and cleaning brushes 21, the cleaning brushes 21 are in contact with the inner wall of the mixing barrel 1, there are four stirring blades 20 and cleaning brushes 21 in total, divided into two groups in pairs, and a mixing shaft 24 is fixedly installed between the two stirring blades 20.

[0043] The working principle of a device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen proposed by the present invention is that, through the rotation of the incomplete gear 18, the stirring rod 19 is driven to rotate, and then the stirring blades 20 are driven to rotate, thereby driving the mixing shaft 24 to rotate, so as to uniformly mix the biochar and the soil. And while the stirring rod 19 rotates, the cleaning brushes 21 are synchronously driven to rotate, so as to clean the inner wall of the mixing barrel 1, preventing the soil and biochar from adhering to the inner wall of the mixing barrel 1 and affecting subsequent use.

[0044] In one embodiment, for the above-mentioned bucket lid 2, one end of a connecting rod 22 is fixedly installed on the bucket lid 2, the other end of the connecting rod 22 passes through the incomplete gear 18 and the stirring rod 19 and is fixedly installed on the crushing box 23, a second motor 25 is fixedly installed inside the crushing box 23, and the output end of the second motor 25 is fixedly installed with a crushing roller 26, and there are two crushing rollers 26.

[0045] In one embodiment, for the above-mentioned crushing rollers 26, both of the two crushing rollers 26 are rotatably installed inside the crushing box 23. A second gear 27 is fixedly installed on both of the two crushing rollers 26. The two second gears 27 are rotatably installed inside the crushing box 23, and the two second gears 27 mesh with each other.

[0046] The working principle of the device for repairing soil petroleum pollution by combining biochar with exogenous nitrogen proposed by the present invention is that after the first placing box 13 and the second placing box 14 are evenly fed, at this time, the biochar and the soil will fall into the inside of the crushing box 23. Then, the second motor is started, which drives the crushing roller 26 to rotate, and further drives the second gear 27 to rotate. Since the two second gears 27 mesh with each other, the two crushing rollers 26 can rotate in opposite directions, and then the soil and the biochar can be crushed, so that the mixing operation can be better carried out.

[0047] In one embodiment, for the above-mentioned crushing box 23, a fixed frame 28 is movably installed inside the crushing box 23. A plurality of grindstones 29 are fixedly installed inside the fixed frame 28. The plurality of grindstones 29 correspond to the blades on the crushing roller 26.

[0048] In one embodiment, for the above-mentioned mixing barrel 1, a discharge port 30 is opened at the bottom of the mixing barrel 1. The mixing barrel 1 is fixedly installed with a plurality of support legs 31.

[0049] The working principle of the device for repairing soil petroleum pollution by combining biochar with exogenous nitrogen proposed by the present invention is that when the crushing roller 26 rotates, it can be polished by the grindstone 29, which not only prevents the blades on the crushing roller 26 from adhering to the soil and the biochar, but also can polish it to prevent it from becoming dull.

[0050] Finally, the mixed materials are discharged through the discharge port 30.

[0051] It can be supplemented that in the method for repairing petroleum-polluted soil by combining biochar with exogenous nitrogen:

[0052] The effects of the application of biochar combined with exogenous nitrogen on soil petroleum hydrocarbons may be related to the type and application amount of exogenous nitrogen, the physicochemical properties of the polluted soil, soil environmental factors, soil microbial communities, etc. Nitrogen is an essential nutrient element for the synthesis of genetic materials during the growth and reproduction of microorganisms. The low TN and TP of the petroleum-polluted soil at the target site may affect the growth and reproduction of microorganisms, thereby affecting the biodegradation efficiency of petroleum hydrocarbons.

[0053] A soil microcosm experiment was conducted using wheat straw biochar (WS500, application rate of 5%) to investigate the effects of exogenous nitrogen of different types (sodium nitrate, ammonium sulfate, urea) and soil C / N (100 / 15, 100 / 10, and 100 / 5) on the biochar-enhanced degradation of petroleum hydrocarbons. The results showed that among the treatment groups of biochar combined with different forms of nitrogen (BC+N), the best remediation effect of petroleum hydrocarbons was achieved under the conditions of sodium nitrate as the exogenous nitrogen and soil C / N of 100 / 5. The removal rates of LCAs and PAHs were 77.24% and 59.76% respectively. Among them, the removal rate of LCAs was higher than that of the CK and BC treatment groups, while the removal rate of PAHs was higher than that of the CK treatment group but lower than that of the BC treatment group. The combined application of biochar and exogenous nitrogen produced a synergistic effect, thereby enhancing the biodegradation efficiency of LCAs. Exogenous nitrogen may also cause competitive adsorption with petroleum hydrocarbons, especially PAHs, resulting in a relatively low removal rate of PAHs.

[0054] The type of exogenous nitrogen in the soil has a significant impact on the bioremediation effect of petroleum hydrocarbons. Among them, the treatment group of biochar combined with sodium nitrate has the best degradation effect on petroleum hydrocarbons. For example, when the soil C / N is 100 / 5 and 100 / 10, the removal rates of soil PAHs in the treatment groups with sodium nitrate and ammonium sulfate added are 41.99% - 59.76%, both higher than that of the urea treatment group (35.75% - 36.88%). When the soil C / N is 100 / 15, the residual amount of soil PAHs in the urea treatment group decreased sharply, and the removal rate reached 44.85%, significantly higher than those of the two inorganic nitrogen source treatment groups (28.49% and 35.76% respectively, p<0.05). Sodium nitrate can provide a nutrient source for soil microorganisms, promote the secretion of surfactants by microorganisms, and may also couple the oxidation of petroleum hydrocarbons through the nitrate reduction pathway, thereby promoting the removal of soil petroleum hydrocarbons.

[0055] Soil C / N has a significant impact on the bioremediation effect of petroleum hydrocarbons. For example, the highest removal rate of PAHs in the treatment group of biochar combined with inorganic nitrogen is achieved when the soil C / N is 100 / 5. The removal rates of soil PAHs in the treatment groups with sodium nitrate and ammonium sulfate are 59.80% and 43.95% respectively; as the soil C / N gradually decreases, the removal rate of PAHs shows a downward trend. The best removal effect of petroleum hydrocarbons is achieved under the condition of soil C / N of 100 / 5 in the treatment of biochar combined with inorganic nitrogen; while a better removal effect is achieved under the condition of soil C / N of 100 / 15 in the treatment of biochar combined with organic nitrogen (urea). The possible reason is that the change in the content of exogenous nitrogen will affect the soil physical and chemical properties and the nitrogen transformation pathway.

[0056] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The preferred embodiments of the invention disclosed above are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can well understand and utilize the invention. The invention is only limited by the claims and their full scope and equivalents.

Claims

1. An apparatus for repairing soil petroleum pollution by combining biochar with exogenous nitrogen, comprising a mixing barrel (1), characterized in that: Above the mixing barrel (1), a barrel cover (2) is movably installed. Above the barrel cover (2), a first motor (3) is provided. At the output end of the first motor (3), a first bevel gear (4) is provided. The first bevel gear (4) meshes with a second bevel gear (5). The second bevel gear (5) is fixedly installed on a first transmission wheel (6). The first transmission wheel (6) is drivingly connected to a second transmission wheel (8) and a third transmission wheel (9) through a transmission belt (7). Both the second transmission wheel (8) and the third transmission wheel (9) are fixedly installed with a rotating rod (10). Inside the rotating rod (10), a knocking rod (12) is slidably connected through a return spring (11). One end of the knocking rod (12) is in contact with a first placement box (13) and a second placement box (14). The bottoms of the first placement box (13) and the second placement box (14) are communicated with a first notch (15). The first notch (15) is communicated with a second notch (16). The second notch (16) is opened on a first gear (17). The first gear (17) meshes with an incomplete gear (18). The incomplete gear (18) is fixedly connected to the first transmission wheel (6).

2. The device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen according to claim 1, characterized in that, The first motor (3) is fixedly installed above the barrel cover (2). The first bevel gear (4) is fixedly connected to the output end of the first motor (3). The first transmission wheel (6), the second transmission wheel (8), and the third transmission wheel (9) are all rotatably installed on the barrel cover (2).

3. The device for repairing soil petroleum pollution by combining biochar with exogenous nitrogen according to claim 2, characterized in that, One end of the return spring (11) is fixedly installed inside the rotating rod (10). The other end of the return spring (11) is fixedly installed on the knocking rod (12). The side of the knocking rod (12) away from the return spring (11) is arc-shaped.

4. The device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen according to claim 3, wherein The first placement box (13) and the second placement box (14) are movably installed on the first notch (15). The first notch (15) is opened on the barrel cover (2). The incomplete gear (18) and the two first gears (17) are all rotatably installed on the barrel cover (2).

5. The device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen according to claim 4, characterized in that, The incomplete gear (18) is fixedly installed with a stirring rod (19). The stirring rod (19) is fixedly installed with stirring blades (20) and cleaning brushes (21). The cleaning brushes (21) are in contact with the inner wall of the mixing barrel (1). There are four stirring blades (20) and four cleaning brushes (21), divided into two groups in pairs. A mixing shaft (24) is fixedly installed between the two stirring blades (20).

6. The device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen according to claim 1, characterized in that, One end of a connecting rod (22) is fixedly installed on the barrel cover (2). The other end of the connecting rod (22) passes through the incomplete gear (18) and the stirring rod (19) and is fixedly installed on a crushing box (23). Inside the crushing box (23), a second motor (25) is fixedly installed. At the output end of the second motor (25), a crushing roller (26) is fixedly installed. There are two crushing rollers (26).

7. The device for repairing soil petroleum pollution by combining biochar with exogenous nitrogen according to claim 6, characterized in that, Both of the two crushing rollers (26) are rotatably installed inside the crushing box (23). A second gear (27) is fixedly installed on each of the two crushing rollers (26). The two second gears (27) are rotatably installed inside the crushing box (23), and the two second gears (27) mesh with each other.

8. The device for repairing soil petroleum pollution by biochar combined with exogenous nitrogen according to claim 6, characterized in that, A fixed frame (28) is movably installed inside the crushing box (23). A plurality of grindstones (29) are fixedly installed inside the fixed frame (28). The plurality of grindstones (29) correspond to the blades on the crushing roller (26).

9. The device for repairing soil petroleum pollution by combining biochar and exogenous nitrogen according to claim 1, characterized in that, A discharge port (30) is formed at the bottom of the mixing barrel (1). The mixing barrel (1) is fixedly installed with a plurality of support legs (31).

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