A soil biomass char separation screen and methods of use thereof

Abstract

The application discloses a kind of soil biomass carbon separation screens and its use method, wherein, the screen frame of separation screen is through from top to bottom, screen frame bottom installs screen bottom plate, water baffle is attached screen frame and screen bottom plate with certain angle, and symmetric with middle part diversion outlet water outlet.Middle part diversion outlet water outlet and side diversion outlet water outlet are located on screen frame, and a plurality of blocking dams are arranged between middle part diversion outlet water outlet and side diversion outlet water outlet, one end of blocking dam is fixed on screen frame inner side wall, blocking groove is formed between adjacent blocking dams, and groove bottom of blocking groove is located on the edge of screen bottom plate, when water flow mixed with biomass carbon and soil passes through blocking dam, soil is more easily precipitated in blocking groove relative to biomass carbon.Compared with existing screen, the application designs blocking dam, which can effectively slow down the kinetic energy of soil migration in screen, and biomass carbon, due to the density is relatively light compared with soil, will cross blocking dam to reach side diversion outlet water outlet, so as to realize the separation of biomass carbon and soil.

Description

Technical Field

[0001] This invention belongs to the technical field of biomass sieves, and particularly relates to a soil biochar separation sieve and its application method. Background Technology

[0002] Biochar, with its abundant surface functional groups, well-developed pore structure, and large specific surface area, is widely used in soil improvement, pollutant degradation, and soil carbon sequestration and emission reduction. As further implementation of greenhouse gas emission reduction measures and strengthening the carbon sequestration capacity of terrestrial ecosystems have become a global consensus, it is imperative to conduct in-depth research on the response patterns of different soil carbon pools to global warming, clarify the relative contributions of plant and microbial substrates to soil organic carbon, and reveal the biological and abiotic regulatory mechanisms of different carbon pools in response to global warming. However, since biochar is mostly applied to soil in small particle or powder form, it often mixes with the soil due to the influence of the outdoor environment. To reduce the impact of undecomposed biochar in the test soil on experimental results, researchers currently employ methods such as manual separation, high-speed centrifugation, electrostatic and electromagnetic separation, separation with saturated cesium chloride solution, and separation with saturated sodium iodide solution to remove biochar from samples, thereby reducing experimental errors.

[0003] Manual separation involves manually picking out large, visible biochar particles from the soil using tweezers. This method is ineffective at removing small, powdery biochar particles and is time-consuming and labor-intensive. High-speed centrifugation separates biochar of varying masses from the soil at specific centrifugation rates. However, the removal efficiency varies depending on the biochar material, and large biochar particles tend to entangle with the soil in the suspension, eventually settling at the bottom of the centrifuge tube. Manual removal is still necessary for some success. Electrostatic separation utilizes the principle of triboelectricity, using charged objects to adsorb or repel lighter biochar powder from the soil. However, this method is not ideal for soils rich in metallic minerals, as electrostatic principles can cause samples carrying metallic properties to be expelled, introducing experimental errors. The separation of saturated cesium chloride solution and sodium iodide solution mainly utilizes the density method to separate different components in soil. However, both are irritants; cesium chloride is toxic, and sodium iodide solution is weakly alkaline, which can affect experiments on acidic soils. Furthermore, the reagents are expensive, and to ensure the accuracy of the experiment, it is necessary to constantly replace and prepare fresh solutions, which increases research costs.

[0004] This application designs a novel sieve that uses the sieve's special structure to separate biochar from soil. This sieve can effectively separate biochar of various sizes and powders without losing the original soil composition, while also reducing the use of chemical reagents, avoiding waste liquid pollution, reducing experimental costs, and achieving green and harmless experiments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a soil biochar separation sieve and its application method.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A soil biochar separation screen includes a screen frame that runs vertically through the screen. A screen bottom plate is installed at the bottom of the screen frame. The screen frame has a central guide outlet and a side guide outlet. Several barrier dams are set between the central guide outlet and the side guide outlets. One end of the barrier dam is fixed to the inner side wall of the screen frame. A barrier trough is formed between adjacent barrier dams. The bottom of the barrier trough is located at the edge of the screen bottom plate. When water mixed with biochar and soil flows through the barrier dams, the soil is more likely to settle in the barrier trough than the biochar.

[0008] To optimize the above technical solution, the specific measures also include:

[0009] The sieve frame is a circular frame with sieve holes distributed on the sieve bottom plate. However, the sieve bottom plate at the bottom of the barrier trough is solid and has no sieve holes.

[0010] Both the central guide outlet and the side guide outlet are located in the upper half of the inner side of the screen frame. Both the central guide outlet and the side guide outlet open at the top of the screen frame. The longitudinal section of the central guide outlet and the side guide outlet is a trapezoidal structure with a wider bottom and a narrower top.

[0011] There is one central diversion outlet and two side diversion outlets. The two side diversion outlets are located on both sides of the central diversion outlet. A barrier dam is set between the central diversion outlet and the two side diversion outlets.

[0012] A baffle plate is installed opposite the middle guide outlet of the screen frame. The baffle plate is inclined and the high end of the baffle plate is an arc with the same curvature as the inner side of the screen frame. The high end of the baffle plate is fixed to the inner side of the screen frame, and the low end of the baffle plate is fixed to the upper surface of the screen bottom plate. When the water flows from the high end to the low end of the baffle plate, the water flow direction is towards the middle guide outlet.

[0013] The barrier dam is a trapezoidal dam, with the end of the barrier dam connected to the screen frame forming the trapezoidal base and the end of the barrier dam furthest from the screen frame forming the trapezoidal apex.

[0014] The screen frame is made of PVC or stainless steel, and the screen bottom plate is made of nylon mesh.

[0015] A method for using a soil biochar separation sieve, specifically including the following steps:

[0016] Step 1: Mix the biochar-soil mixture with deionized water, vortex the mixture thoroughly, and then separate it by ultrasound to obtain powdered or small-particle light biochar on the surface of the liquid. Collect the biochar on the surface of the liquid.

[0017] Step 2: Pour the water-soil mixture after removing the biochar from the liquid surface into the soil-biochar separation sieve. After the water seeps down through the sieve holes, the solids are deposited on the bottom plate of the sieve. The solids deposited on the bottom plate are washed by the washing bottle to fully disperse the biochar and soil mixture particles. Large particles of biochar on the bottom plate are picked out.

[0018] Step 3: Use a spray bottle to spray water onto the baffle plate so that the water flow fully covers the surface of the screen bottom plate. The horizontal water flow will accumulate the remaining biochar and soil on the surface of the screen bottom plate below the central guide outlet.

[0019] Step 4: Rotate the soil biochar separating screen back and forth to tilt it so that the side of the bottom plate near the central guide outlet is lower than the side near the baffle plate. Then, rotate the soil biochar separating screen clockwise and counterclockwise repeatedly to make the water flow carry the accumulated material back and forth between the barrier dams. The denser soil is blocked by the barrier dam and falls into the barrier trough, while the less dense biochar is carried by the water flow over the barrier dam and moves to below the side guide outlet. Stop spraying water onto the baffle plate and let the water seep down through the screen holes.

[0020] Step 5: Further rotate the soil biochar separation screen back and forth to make the soil biochar separation screen tilt more. Use a spray bottle to spray the biochar below the side guide outlet into the side guide outlet. Collect and seal the biochar at the side guide outlet. Return the soil biochar separation screen to horizontal and shake the soil biochar separation screen to move the biochar and soil to the middle of the screen bottom plate.

[0021] Step 6: Repeat steps 3-5 several times. The solids remaining on the bottom plate of the screen are low-impact soil. Use a sprayer to spray water onto the baffle plate so that the water flow fully covers the surface of the bottom plate. The horizontally flowing water will accumulate the low-impact soil on the surface of the bottom plate below the central guide outlet. Stop spraying water onto the baffle plate and let the water seep down through the screen holes.

[0022] Step 7: Rotate the soil biochar separation screen back and forth, and use a spray bottle to flush the low-impact soil below the central guide outlet into the central guide outlet. Collect and seal the low-impact soil at the central guide outlet.

[0023] In step 1, the biochar-soil mixture is mixed with deionized water at a weight ratio of 1:10, and then shaken thoroughly in a vortex shaker for 2-4 minutes. After ultrasonic separation for 3-6 minutes, powdered or small-particle light biochar is obtained from the liquid surface layer. The biochar from the liquid surface layer is collected.

[0024] In step 1, the biochar is scooped from the surface of the liquid using a 100-mesh strainer and transferred to a small beaker for drying in an oven to obtain powdered or small-particle lightweight biochar.

[0025] The beneficial effects of this invention are:

[0026] 1. Compared with existing screens, this invention designs a barrier dam, which can effectively reduce the kinetic energy of soil migrating with the water flow in the screen. Since biochar is relatively lighter than soil, it will cross the barrier dam and reach the side guide outlet, thus achieving the separation of biochar and soil (this design is very effective for experiments of classifying and screening biochar from aggregates).

[0027] 2. This invention incorporates a water-blocking plate. In soil grading or organic matter-related experiments, large amounts of deionized water are often required for rinsing to ensure accuracy. This water-blocking plate, with its angled design, utilizes surface tension and the kinetic energy of the water flow to prevent the water from flowing directly through the sieve mesh. Instead, the water moves along the sieve plate towards the central outlet. This allows for efficient collection of materials on the sieve plate at the lower part of the central outlet with minimal water consumption (this design is highly beneficial for studying particulate / mineral-bound materials in soil).

[0028] 3. This invention features a central and side guide outlet with a wide bottom and narrow top cross-section, facilitating the collection of biochar and soil through the guide outlet. This effectively solves the problem of difficult collection of biochar and soil during experiments. Existing biochar sieves lack this guide outlet. After sieving biochar and soil, they need to be placed in small-diameter sealed bags. To avoid sample loss, folded kraft paper or weighing paper is used for bagging, which is not only cumbersome but also requires frequent paper changes to prevent sample cross-contamination. The guide outlet designed in this invention, with its wide bottom and narrow top cross-section, guides the material to the outlet, and the notch allows for precise bagging, avoiding cross-contamination and reducing paper material loss.

[0029] 4. This invention is designed with three outlets, including two side guide outlets. Users can choose to operate the side guide outlet and the corresponding barrier dam according to their hand habits. Attached Figure Description

[0030] Figure 1 This is a front view of the present invention;

[0031] Figure 2 This is a side view of the present invention;

[0032] Figure 3 This is a rear view of the present invention;

[0033] Figure 4 This is a cross-sectional view of the present invention;

[0034] Figure 5 This is a perspective view of the present invention.

[0035] The attached diagram is labeled as follows: 1. Screen frame; 2. Screen bottom plate; 21. Screen hole; 3. Central guide outlet; 4. Side guide outlet; 5. Barrier dam; 6. Water baffle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following embodiments are provided to describe and illustrate this application. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0037] This invention mainly consists of five important structural components: a PVC cylindrical sieve frame 1 (mainly serving to support the sieve bottom plate 2), a sieve bottom plate 2 (mainly for sieving soil and biochar of different particle sizes), a central guide outlet 3, a side guide outlet 4 (mainly for facilitating wastewater discharge and material bagging, reducing the risk of sample scattering during bagging), a trapezoidal barrier dam 5 (mainly used to prevent soil migration with water flow), and a semi-circular arc baffle 6 (mainly using the inclined angle and close fit to the mesh surface to allow water to flow along the mesh surface to the outlet, achieving the function of cleaning the mesh surface).

[0038] Working principle: First, a vortex oscillator disperses the soil in deionized water. Then, ultrasound is used to disperse large soil particles that have not been separated by the oscillation, allowing for the complete release of biochar. Next, utilizing the permeability of the sieve holes 21 in the sieve bottom plate 2, different mesh sizes of the sieve bottom plate 2 are selected to separate biochar and soil of different particle sizes. Secondly, the surface tension of water is utilized; by controlling the angle of the water flow through the sieve bottom plate 2, the sieve bottom plate 2 is scourned. Then, the kinetic energy of the water flow and the barrier structure are used to separate the lighter biochar from the soil. Finally, the water and soil separation and portable material collection are achieved through the side guide outlet 4.

[0039] Specifically, the method of using the soil biochar separation sieve of the present invention is as follows:

[0040] Step 1: Mix the biochar-soil mixture with deionized water at a weight ratio of 1:10, vortex shake for 2-4 minutes, then separate by ultrasonication for 3-6 minutes. Use a 100-mesh strainer to scoop and collect the liquid from the surface to obtain powdered or small-particle lightweight biochar.

[0041] Step 2: Pour the water-soil mixture after removing the biochar from the liquid surface into the soil-biochar separation sieve. After the water seeps down through the sieve hole 21, the solids are deposited on the sieve bottom plate 2. The solids deposited on the sieve bottom plate 2 are washed by the washing bottle to fully disperse the biochar and soil mixture particles. Large particles of biochar on the sieve bottom plate 2 are picked out.

[0042] Step 3: Use a spray bottle to spray water onto the baffle plate 6 so that the water flow fully covers the surface of the screen bottom plate 2. The horizontally flowing water will accumulate the remaining biochar and soil on the surface of the screen bottom plate 2 below the central guide outlet 3.

[0043] Step 4: Rotate the soil biochar separating screen back and forth to tilt it so that the side of the bottom plate 2 near the central guide outlet 3 is lower than the side near the baffle plate 6. Then, rotate the soil biochar separating screen clockwise and counterclockwise repeatedly so that the water flow can cause the accumulated material to move back and forth between the barrier dams 5. The denser soil is blocked by the barrier dams 5 and falls into the barrier trough, while the less dense biochar is carried by the water flow over the barrier dams and moves to below the side guide outlet 4. Stop spraying water onto the baffle plate 6 and let the water seep down from the screen holes 21.

[0044] Step 5: Further rotate the soil biochar separation screen back and forth to make the soil biochar separation screen tilt more. Use a spray bottle to spray the biochar below the side guide outlet 4 into the side guide outlet 4. Collect and seal the biochar at the side guide outlet 4. Return the soil biochar separation screen to the horizontal position. Shake the soil biochar separation screen to move the biochar and soil to the middle of the screen bottom plate 2.

[0045] Step 6: Repeat steps 3-5 several times. The solids remaining on the bottom plate 2 are low-impact soil. Use a sprayer to spray water onto the baffle plate 6 so that the water flow fully covers the surface of the bottom plate 2. The horizontally flowing water will accumulate the low-impact soil on the surface of the bottom plate 2 below the central guide outlet 3. Stop spraying water onto the baffle plate 6 and let the water seep down from the screen holes 21.

[0046] Step 7: Rotate the soil biochar separation screen back and forth, and use a spray bottle to flush the low-impact soil below the central guide outlet 3 into the central guide outlet 3. Collect and seal the low-impact soil at the central guide outlet 3.

[0047] The biochar used in the following case study came from an environmental protection technology company in Zhejiang Province. The raw materials for preparation were corn stalks, rice stalks, and pig manure, and the preparation temperature was 500℃.

[0048] Practical Case 1

[0049] The biochar application plan uses 1% and 2% of the soil mass as biochar, primarily employing corn straw biochar, rice straw biochar, and pig manure straw biochar. It is applied to dryland red-yellow soils, and the application process involves manually spreading the biochar on the soil surface two weeks before tillage, followed by thorough mixing with the top 10-15cm of soil using a rotary tiller. A cabbage-sweet potato rotation is implemented, with planting patterns and fertilization methods consistent with local farmland management practices.

[0050] Practical Case 2

[0051] The biochar implementation plan uses 1% and 2% of the soil mass as biochar, respectively. The main types of biochar used are corn straw biochar, rice straw biochar, and pig manure straw biochar. For paddy field clay soil, the application is done by manually spreading it onto the soil surface two weeks before tillage, followed by thorough mixing with the top 15-20cm of soil using a rotary tiller. Wheat-rice rotation is implemented, and the planting pattern and fertilization methods are consistent with local farmland management practices.

[0052] Around October each year, after the crops are harvested, soil samples are collected from the two plots mentioned above. Using a five-point sampling method, soil samples are evenly collected from each plot. The soil samples from dry land are collected at a depth of 0–15 cm, and the soil samples from paddy fields are collected at a depth of 0–20 cm. After being properly sealed and stored at low temperatures, the samples are promptly sent back to the laboratory.

[0053] The specific operating procedure is as follows:

[0054] (1) The soil samples taken from the experimental area were pretreated (removing stones, weeds, plant roots and small animals in the soil) and then air-dried naturally.

[0055] (2) Take the air-dried soil from (1) as the experimental soil. Weigh the soil required for the experiment and mix it with deionized water at a ratio of 1:10. Shake it thoroughly for 2 minutes on a vortex shaker (4 minutes for paddy soil). Then separate it by ultrasound for 3 minutes (6 minutes for paddy soil). Powdered or small-particle light biochar can be obtained on the surface of the liquid using a 100-mesh sieve.

[0056] (3) Place the present invention in a water basin of a certain size, and then pour the water-soil mixture treated in (2) into the separation sieve. Use a washing bottle to spray and wash the solid deposited on the bottom plate 2 of the sieve, so that the biochar and soil mixed particles are fully dispersed. At this time, large particles of biochar that can be seen with the naked eye can be obtained. Use tweezers to pick them out.

[0057] (4) Use a sprayer to spray water onto the baffle plate 6 so that the water flow fully covers the bottom plate 2 of the screen and slowly accumulate the remaining biochar and soil on the screen after (3) treatment at the lower part of the central guide outlet 3.

[0058] (5) Use a spray bottle to slowly rinse the soil pile after (4) treatment, and rotate the separation screen so that the water flow carries the pile back and forth between the barrier dams 5. At this time, it can be seen that the denser soil will be blocked in the barrier dams 5, and the less dense biochar will be carried by the water flow through the barrier dams 5 to the lower part of the No. 1 or No. 2 diversion outlet (the outlet position of the material is determined by which hand the operator is used to use).

[0059] (6) Use a spray bottle to slowly rinse the biochar deposited at the bottom of the No. 1 or No. 2 side guide outlet 4 after (5) treatment into a beaker for collection. After multiple rotations and washing, complete soil with fewer impurities can be obtained. Similarly, use a spray bottle to slowly rinse the soil to the middle guide outlet 3, and collect and seal it through the outlet.

[0060] Note: Select sieves with different aperture / mesh counts according to different experimental requirements. The material (nylon or metal) and thickness (thickness of sieve frame 1 and sieve bottom plate 2) of the separation sieve can be appropriately changed according to the actual situation to improve the ability to screen biochar and improve experimental efficiency.

[0061] Details of the biochar screening effect in different soil types under different treatments are shown in Tables 1 and 2.

[0062] Table 1 Comparison of screening effects of different biochars in dryland red and yellow soils

[0063]

[0064] Table 2 Comparison of screening effects of different biochars in paddy field clay.

[0065]

[0066] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the implementation of the calculation method of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the needs of the calculation method are met, they are all within the protection scope of the present invention.

Claims

1. A soil biomass charcoal separation screen, comprising a screen frame (1), the screen frame (1) is through from top to bottom, the screen frame (1) bottom is installed with a screen bottom plate (2), characterized in that: The screen frame (1) is provided with a middle flow guide outlet (3) and a side flow guide outlet (4), a plurality of blocking dams (5) are arranged between the middle flow guide outlet (3) and the side flow guide outlet (4), one end of the blocking dam (5) is fixed on the inner side wall of the screen frame (1), adjacent blocking dams (5) form a blocking groove, the groove bottom of the blocking groove is located at the edge of the screen bottom plate (2), when the water mixed with biomass charcoal and soil passes through the blocking dam (5), the soil is more likely to be precipitated in the blocking groove than the biomass charcoal; The screen frame (1) is a circular frame, the screen bottom plate (2) is distributed with screen holes (21), wherein the screen bottom plate at the position of the groove bottom of the blocking groove is solid and is not provided with screen holes (21); the middle flow guide outlet (3) and the side flow guide outlet (4) are both arranged in the upper half of the inner side of the screen frame (1), the middle flow guide outlet (3) and the side flow guide outlet (4) are both opened at the top of the screen frame (1), the longitudinal section of the middle flow guide outlet (3) and the side flow guide outlet (4) is a trapezoidal structure with a wide bottom and a narrow top; the number of the middle flow guide outlet (3) is one, the number of the side flow guide outlet (4) is two, the two side flow guide outlets (4) are respectively arranged on the two sides of the middle flow guide outlet (3), and the blocking dam (5) is arranged between the middle flow guide outlet (3) and the two side flow guide outlets (4); the screen frame (1) is provided with a water baffle (6) opposite to the middle flow guide outlet (3), the water baffle (6) is arranged obliquely, the high end of the water baffle (6) is a circular arc with the same curvature as the inner side of the screen frame (1), the high end of the water baffle (6) is fixed on the inner side of the screen frame (1), and the low end of the water baffle (6) is fixed on the upper surface of the screen bottom plate (2); when the water flows from the high end to the low end of the water baffle (6), the water flow direction is towards the middle flow guide outlet (3).

2. The soil biomass charcoal separation screen of claim 1, wherein: The blocking dam (5) is a trapezoidal dam, one end of the blocking dam (5) connected with the screen frame (1) is a trapezoidal bottom, and the other end of the blocking dam (5) away from the screen frame (1) is a trapezoidal top.

3. The soil biomass charcoal separation screen of claim 1, wherein: The screen frame (1) is a PVC frame or a stainless steel frame, and the screen bottom plate (2) is a nylon mesh surface.

4. A method of using a soil biomass char separation screen, characterized by: The soil-biomass charcoal separation screen according to claim 1 is used, and specifically includes the following steps: Step 1, mixing the biomass charcoal-soil mixed sample with deionized water, fully oscillating on a vortex oscillator, and then separating through ultrasonic, so that the powder or small particle light biomass charcoal is obtained on the liquid surface layer, and the biomass charcoal on the liquid surface layer is collected; Step 2, pouring the water-soil mixture after removing the light biomass charcoal on the liquid surface layer into the soil-biomass charcoal separation screen, after the water seeps through the screen holes (21), the solid is deposited on the screen bottom plate (2), the solid deposited on the screen bottom plate (2) is washed through a washing bottle, so that the biomass charcoal and the soil mixed particles are fully dispersed, and the large particle biomass charcoal on the screen bottom plate (2) is picked out; Step 3, spraying water on the water baffle (6) by using a watering can, so that the water flow fully covers the surface of the screen bottom plate (2), and the remaining biomass charcoal and soil on the surface of the screen bottom plate (2) are accumulated under the position of the middle flow guide outlet (3) by the transverse water flow. Step 4, rotate the soil biomass carbon separation screen forward and backward, so that the soil biomass carbon separation screen is inclined, and the inclination direction is that the side of the screen bottom plate (2) close to the middle flow guide water outlet (3) is lower than the side close to the water baffle (6), then repeatedly rotate the soil biomass carbon separation screen clockwise and counterclockwise, so that the water flow drives the accumulated material to move back and forth between the blocking dams (5), wherein the soil with a larger density is blocked by the blocking dams (5) and falls into the blocking groove, and the biomass carbon with a smaller density is driven by the water flow to cross the blocking dam and move to the position below the side flow guide water outlet (4), stop the sprinkler from spraying water on the water baffle (6), so that the water seeps down from the screen hole (21); Step 5, further rotate the soil biomass carbon separation screen in the same direction forward and backward, so that the inclination of the soil biomass carbon separation screen is greater, use the sprinkler to flush the biomass carbon below the side flow guide water outlet (4) into the side flow guide water outlet (4), collect and package the biomass carbon at the side flow guide water outlet (4), restore the soil biomass carbon separation screen to horizontal, and shake the soil biomass carbon separation screen to move the biomass carbon and soil to the middle part of the screen bottom plate (2); Step 6, repeat steps 3-5 several times, the solid remaining on the screen bottom plate (2) is low-impurity soil, use the sprinkler to spray water on the water baffle (6) to make the water flow fully cover the surface of the screen bottom plate (2), the transverse water flow accumulates the low-impurity soil on the surface of the screen bottom plate (2) below the middle flow guide water outlet (3), stop the sprinkler from spraying water on the water baffle (6), so that the water seeps down from the screen hole (21); Step 7, rotate the soil biomass carbon separation screen forward and backward, use the sprinkler to flush the low-impurity soil below the middle flow guide water outlet (3) into the middle flow guide water outlet (3), and collect and package the low-impurity soil at the middle flow guide water outlet (3).

5. The method of claim 4, wherein the soil biomass charcoal separation screen is characterized by: In step 1, the biomass carbon-soil mixed sample is mixed with deionized water at a weight ratio of 1:10, fully shaken on a vortex shaker for 2-4 min, and then separated by ultrasonic for 3-6 min, to obtain powder or small particle lightweight biomass carbon on the liquid surface layer, and collect the biomass carbon on the liquid surface layer.

6. The method of claim 4, wherein the soil biomass charcoal separation screen is characterized by: In step 1, use a 100-mesh strainer to fish in the liquid surface layer, transfer the separated biomass carbon to a small beaker and dry it in an oven to obtain powder or small particle lightweight biomass carbon.

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