Intelligent biological reactor remediation technical equipment and remediation method for coal chemical contaminated site

Abstract

The invention relates to intelligent biological reactor remediation technical equipment and a remediation method for a polluted site in the coal chemical industry. A leachate storage barrel, a pesticide supplementing tank and a water supplementing tank are sequentially communicated, and a water supplementing pump injects a microbial nutrient agent into a biological reactor through a nutrient and moisture blending water inlet pipe; the nutrient moisture blending water return pipe is used for enabling the uninjected microbial nutrient agent to flow back into the nutrient moisture blending water inlet pipe, the gas-liquid separator is communicated with the activated carbon box through the Roots blower and used for filtering gas, the gas-liquid separator is communicated with a plurality of gas extraction branch pipes through a gas extraction main pipe, and the gas extraction branch pipes are inserted and buried at the bottom of the biological pile and used for filtering gas. The Roots blower pumps a gas-liquid mixture of the biological pile through the gas pumping branch pipe, the gas inlet pipe feeds gas into the biological pile, the Roots blower and the gas pump can carry out gas pumping and gas exchange on the biological pile, and the extraction pump pumps the collected microbial nutrient agent back into the leachate storage barrel through the leachate collection pipe. The device integrates preparation and accurate injection of microbial nutrition agents, gas extraction treatment and automatic data monitoring.

Description

Technical Field

[0001] The invention relates to intelligent biopile remediation technology equipment and a remediation method for a coal chemical industry contaminated site. Background Art

[0002] The Northwest region is a major coal chemical industry cluster in my country. While the coal chemical industry promotes regional economic development, due to the backward production technology of some enterprises and the presence of a large number of organic pollutants such as benzene, polycyclic aromatic hydrocarbons and phenol with "three-cause" effects in coal chemical sites, the complexity of coal chemical site pollution and the difficulty of pollutants to degrade lead to serious ecological and health risks in the process of site soil development and reuse. At present, the remediation of organic polluted sites such as polycyclic aromatic hydrocarbons is still mainly based on thermal desorption technology, which has the problems of high energy consumption and high cost. It is urgent to develop efficient, cheap and easy-to-operate treatment technology to repair polluted plots. Microbial remediation technology with biocatalytic degradation function has the advantages of environmental friendliness, low cost and no secondary pollution, but the corresponding supporting equipment is mostly in the research stage, with few industrial applications, and even less experience in the intensive and intelligent development of equipment. Therefore. It is urgent to develop intelligent microbial equipment for the remediation of coal chemical pollution sites in the Northwest. Summary of the invention

[0003] The present invention provides an intelligent biopile remediation technology equipment and a remediation method for coal chemical pollution sites, which is an intelligent microbial remediation technology equipment integrating microbial nutrient agent configuration and precise injection, gas extraction-processing and automatic data monitoring, and has the characteristics of intelligence, intensiveness, easy operation and installation, etc.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An intelligent biopile remediation technology equipment for coal chemical pollution sites, characterized in that: a leachate storage tank, a medicine replenishing tank and a water replenishing tank are connected in sequence, a water replenishing pump is arranged on the pipeline between the medicine replenishing tank and the water replenishing tank, the water replenishing pump is connected to a nutrient water allocation water inlet pipe, and can uniformly inject microbial nutrient agents into the biopile, the water replenishing tank is connected to a water reservoir through a pump, and a nutrient water allocation water return pipe is connected to an inlet end of the water replenishing pump, so that uninjected microbial nutrient agents can flow back into the nutrient water allocation water inlet pipe;

[0006] The gas outlet end of the gas-liquid separator is connected to the activated carbon box through a Roots blower, the inlet end of the gas-liquid separator is connected to an air extraction main pipe, the air extraction main pipe is connected to a plurality of air extraction branch pipes, the air extraction branch pipes are inserted and buried at the bottom of the biopile, the Roots blower extracts a gas-liquid mixture into the biopile through the air extraction main pipe and the air extraction branch pipes, the extracted gas-liquid mixture enters the gas-liquid separator for separation, the separated gas enters the activated carbon box for filtration and discharge, the separated liquid flows into the leachate storage tank for recycling and reuse, a plurality of air intake pipes are arranged on the top of the biopile, the air intake pipes are located above the air extraction branch pipes, the air intake pipes are connected to the soil air guide pipe, the soil air guide pipe takes air into the biopile through an air pump, and the Roots blower and the air pump can extract air from the biopile;

[0007] The gas-liquid separator is also connected to the leachate storage barrel, and the extraction pump extracts the collected microbial nutrient agent back into the leachate storage barrel through the leachate collection pipe;

[0008] A drip irrigation pipe and a dripper are arranged on the top of the biopile, the drip irrigation pipe is connected with the nutrient water mixing water inlet pipe, the dripper can uniformly inject microbial nutrient agent into the biopile, the leachate collection pipe is arranged at the bottom of the biopile for collecting microbial nutrient agent, an air extraction branch pipe is also arranged at the bottom of the biopile, the air extraction branch pipe is connected with the air extraction main pipe for extracting the gas-liquid mixture in the biopile, a soil gas monitoring point is arranged in the biopile, and a soil gas probe is arranged in the soil gas monitoring point for real-time monitoring of the oxygen content, water content and carbon, nitrogen and phosphorus content ratio in the biopile;

[0009] The central control system is connected to the soil gas probe signal through a signal line, and the central control system is also respectively connected to the extraction pump, the water supply pump and the Roots blower signal. The central control system receives the signal from the soil gas probe and controls the opening and closing of the pump body and the blower, so as to evenly inject and ventilate the biopile. The central control system is connected to the monitoring instrument signal, and the data monitored by the soil gas probe is displayed in real time on a large screen and stored and recorded.

[0010] The intelligent biopile remediation technology equipment for coal chemical pollution sites, wherein: a regulating valve is arranged on the drip irrigation pipe, a control valve and a flow meter are arranged on the exhaust branch pipe, and the central control system is connected with the regulating valve, the control valve and the flow meter signal to control the opening and closing of the valve body and receive flow data.

[0011] The intelligent biopile remediation technology equipment for coal chemical pollution sites, wherein: a gravel air conduction layer is arranged at the bottom of the biopile, a geotextile is arranged between the biopile and the gravel air conduction layer, a leachate collecting pipe is arranged between the gravel air conduction layer and the concrete anti-seepage foundation, the concrete anti-seepage foundation is arranged to be high on both sides and low in the middle, the leachate is concentrated in the middle and enters the leachate collecting pipe, clean clay is arranged around the gravel air conduction layer, a covering film is arranged above the biopile, and sandbags are pressed and anchored around the covering film.

[0012] The intelligent biopile remediation technology equipment for coal chemical pollution sites, wherein: the leachate collection pipe is slit on one side facing the biopile, with a slit width of 0.5 mm, a slit spacing of 1 cm, and a slit depth of 25 mm for collecting leachate.

[0013] The intelligent biopile remediation technology equipment for coal chemical pollution sites, wherein: the soil gas probe includes a temperature sensor, a humidity sensor, a nitrogen, phosphorus and potassium probe, a pH probe, a redox potentiometer, an oxygen content monitoring device, a carbon dioxide monitoring device and a gas / liquid vortex flowmeter, which monitors the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas of the biopile in real time.

[0014] A method for repairing coal chemical pollution sites using intelligent biopile repair technology equipment, characterized in that it comprises the following steps:

[0015] Step 1: Open the control valve, flow meter and Roots blower through the central control system, and gradually increase the air flow rate to exhaust air, so as to ensure that the air path in the biopile is uniform and avoid the formation of a priority channel;

[0016] Step 2: During the gas extraction process, the flow rate in the gas extraction branch pipe is monitored by the flow meter, and the Roots blower extracts a gas-liquid mixture into the biopile through the gas extraction main pipe and the gas extraction branch pipe. The extracted gas-liquid mixture enters the gas-liquid separator and is separated. The separated gas enters the activated carbon box for filtration and is directly discharged. The separated liquid flows into the leachate storage barrel and is supplied back to the tank for multiple uses.

[0017] Step 3, the soil gas probe monitors the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas in the biopile in real time, and when the oxygen content at each soil monitoring point is about 10%, the control valve, the flow meter and the Roots blower are closed through the central control system;

[0018] Step 4, the regulating valve and the water supply pump are opened through the central control system, and the microbial nutrient agent and water in the medicine supply tank and the water supply tank are uniformly injected into the biopile through the dripper, and the moisture content and nitrogen, phosphorus, potassium content and other indicators of the soil in the biopile are monitored in real time through the soil gas probe. When the moisture content in the biopile is higher than 10% and the carbon, nitrogen and phosphorus content ratio reaches 100:10:1, the regulating valve and the water supply pump are closed through the central control system, and the injection of microbial nutrient agent and water into the biopile is stopped;

[0019] Step 5: The microbial nutrient agent penetrates into the gravel air-conducting layer and is collected and flows into the leachate collection pipe. The extraction pump is turned on by the central control system to collect the microbial nutrient agent in the leachate collection pipe into the leachate storage barrel for recycling and reuse;

[0020] Step 6. When the oxygen content at each soil monitoring point is about 10%, the air pump is turned on through the central control system, and air is introduced into the biopile through the air intake pipe and the soil air guide pipe. Through the air extraction and air intake operations, the ventilation in the biopile is adjusted and improved to adjust and improve the growth environment of microorganisms, thereby achieving the purpose of repairing the polluted land.

[0021] The beneficial effects of the present invention are as follows: the intelligent microbial remediation technology equipment integrates the configuration and precise injection of microbial nutrient agents, gas extraction-processing and automatic data monitoring, has the characteristics of intelligence, intensiveness, easy operation and installation, and can meet the needs of microbial remediation technology for coal chemical pollution sites in Northwest my country. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a top-down structural diagram of the intelligent biopile remediation technology equipment for coal chemical pollution sites.

[0023] Figure 2 This is the tank and pump structure diagram of the intelligent biopile remediation technology equipment for coal chemical pollution sites.

[0024] Figure 3 This is the main structural diagram of the intelligent biopile remediation technology equipment for coal chemical pollution sites.

[0025] Figure 4 This is a cross-sectional structural diagram of a biopile.

[0026] Figure 5 This is a structural diagram of the intelligent biopile remediation technology equipment combined with the biopile for coal chemical pollution sites.

[0027] Explanation of the reference numerals: 1- leachate storage tank; 2- medicine replenishment tank; 3- water replenishment tank; 4- extraction pump; 5- water replenishment pump; 6- water pump; 7- central control system; 8- gas-liquid separator; 9- Roots blower; 10- activated carbon box; 11- biopile; 12- geotextile; 13- gravel air conduction layer; 14- clean clay; 15- concrete anti-seepage foundation; 16- suction branch pipe; 17- leachate collection pipe; 18- soil gas probe; 19- anchoring sandbag; 20- nutrient and water allocation water inlet pipe; 21- signal line; 22- dripper; 23- covering film; 24- air inlet pipe; 25- soil air conduction pipe; 26- nutrient and water allocation return pipe; 27- suction main pipe; 28- control valve; 29- flow meter; 30- regulating valve; 31- soil gas monitoring point; 32- drip irrigation pipe. DETAILED DESCRIPTION

[0028] like Figures 1 to 5 As shown, an intelligent biopile remediation technology equipment for coal chemical pollution sites is characterized in that: the leachate storage barrel 1, the medicine replenishing tank 2 and the water replenishing tank 3 are connected in sequence, and a water replenishing pump 5 is arranged on the pipeline between the medicine replenishing tank 2 and the water replenishing tank 3. The water replenishing pump 5 is connected to the nutrient water allocation water inlet pipe 20, and can evenly inject microbial nutrient agents into the biopile 11. The water replenishing tank 3 is connected to the water reservoir through the pump 6, and the nutrient water allocation return pipe 26 is connected to the inlet end of the water replenishing pump 5, so that the uninjected microbial nutrient agents can flow back into the nutrient water allocation water inlet pipe 20.

[0029] The gas outlet end of the gas-liquid separator 8 is connected to the activated carbon box 10 through the Roots blower 9, and the inlet end of the gas-liquid separator 8 is connected to the exhaust main pipe 27, and the exhaust main pipe 27 is connected to a plurality of exhaust branch pipes 16. The exhaust branch pipes 16 are provided with a control valve 28 and a flow meter 29. The exhaust branch pipes 16 are buried at the bottom of the biopile 11. The Roots blower 9 extracts a gas-liquid mixture into the biopile 11 through the exhaust main pipe 27 and the exhaust branch pipe 16, and the extracted gas-liquid mixture enters the biopile 11. The gas-liquid separator 8 is used for separation, the separated gas enters the activated carbon box 10 for filtration and discharge, and the separated liquid flows into the leachate storage barrel 1 for recycling and reuse. A plurality of air inlet pipes 24 are arranged on the top of the biopile 11, and the air inlet pipes 24 are located above the air extraction branches 16. The air inlet pipes 24 are connected to the soil air guide pipe 25, and the soil air guide pipe 25 takes air into the biopile 11 through the air pump. The Roots blower 9 and the air pump can extract and ventilate the biopile 11.

[0030] The gas-liquid separator 8 is also connected to the leachate storage barrel 1, and the extraction pump 4 extracts the collected microbial nutrient agent back into the leachate storage barrel 1 through the leachate collecting pipe 17. The leachate collecting pipe 17 has a slit on the side facing the biopile 11, with a slit width of 0.5 mm, a slit spacing of 1 cm, and a slit depth of 25 mm for collecting leachate.

[0031] A drip irrigation pipe 32 and a dripper 22 are arranged on the top of the biopile 11. A regulating valve 30 is arranged on the drip irrigation pipe 32. The drip irrigation pipe 32 is connected to the nutrient water mixing water inlet pipe 20. The dripper 22 can uniformly inject microbial nutrient agents into the biopile 11. The leachate collecting pipe 17 is arranged at the bottom of the biopile 11 for collecting microbial nutrient agents. An exhaust branch pipe 16 is also arranged at the bottom of the biopile 11. The exhaust branch pipe 16 is connected to the exhaust main pipe 27 for extracting the microbial nutrient agents. The gas-liquid mixture in the biopile 11, a soil gas monitoring point 31 is set in the biopile 11, and a soil gas probe 18 is set in the soil gas monitoring point 31. The soil gas probe 18 includes a temperature sensor, a humidity sensor, a nitrogen, phosphorus and potassium probe, a pH probe, a redox potentiometer, an oxygen content monitoring device, a carbon dioxide monitoring device and a gas / liquid vortex flowmeter, which can monitor the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas of the biopile 11 in real time.

[0032] A gravel air-conducting layer 13 is arranged at the bottom of the biopile 11, a geotextile 12 is arranged between the biopile 11 and the gravel air-conducting layer 13, a leachate collecting pipe 17 is arranged between the gravel air-conducting layer 13 and the concrete anti-seepage foundation 15, the concrete anti-seepage foundation 15 is arranged to be high on both sides and low in the middle, and the leachate is concentrated in the middle and enters the leachate collecting pipe 17, clean clay 14 is arranged around the gravel air-conducting layer 13, a covering film 23 is arranged above the biopile 11, and sandbags 19 are pressed and anchored around the covering film 23.

[0033] The central control system 7 is connected to the soil gas probe 18 by signal through the signal line 21. The central control system 7 is also connected to the extraction pump 4, the water replenishment pump 5 and the Roots blower 9 respectively. The central control system 7 receives the signal from the soil gas probe 18 and controls the opening and closing of the pump body and the blower, so as to evenly inject and ventilate the biopile 11. The central control system 7 is connected to the regulating valve 30, the control valve 28 and the flow meter 29 by signal, controls the opening and closing of the valve body and receives flow data. The central control system 7 is connected to the monitoring instrument by signal, and the data monitored by the soil gas probe 18 is displayed in real time on a large screen and stored and recorded.

[0034] A method for repairing coal chemical pollution sites using intelligent biopile repair technology equipment, characterized in that it comprises the following steps:

[0035] Step 1: Open the control valve 28, the flow meter 29 and the Roots blower 9 through the central control system 7, and gradually increase the air flow rate to exhaust air, so as to ensure that the air path in the biopile 11 is uniform and avoid the formation of a priority channel;

[0036] Step 2: During the gas extraction process, the flow rate in the gas extraction branch pipe 16 is monitored by the flow meter 29, and the Roots blower 9 extracts a gas-liquid mixture into the biopile 11 through the gas extraction main pipe 27 and the gas extraction branch pipe 16. The extracted gas-liquid mixture enters the gas-liquid separator 8 and is separated. The separated gas enters the activated carbon box 10 for filtration and is directly discharged. The separated liquid flows into the leachate storage barrel 1 and is supplied back to the tank for multiple uses.

[0037] Step 3, the soil gas probe 18 monitors the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas in the biopile 11 in real time. When the oxygen content at each soil monitoring point 31 is about 10%, the control valve 28, the flow meter 29 and the Roots blower 9 are closed through the central control system 7;

[0038] Step 4, the regulating valve 30 and the water replenishment pump 5 are opened through the central control system 7, and the microbial nutrients and water in the replenishment tank 2 and the replenishment tank 3 are uniformly injected into the biopile 11 through the dripper 22, and the soil moisture content and nitrogen, phosphorus, potassium content and other indicators in the biopile 11 are monitored in real time through the soil gas probe 18. When the moisture content in the biopile 11 is higher than 10% and the carbon, nitrogen and phosphorus content ratio reaches 100:10:1, the regulating valve 30 and the water replenishment pump 5 are closed through the central control system 7, and the injection of microbial nutrients and water into the biopile 11 is stopped;

[0039] Step 5: The microbial nutrient agent penetrates into the gravel gas-conducting layer 13 and is collected and flows into the leachate collecting pipe 17. The extraction pump 4 is turned on by the central control system 7 to collect the microbial nutrient agent in the leachate collecting pipe 17 into the leachate storage barrel 1 for recycling;

[0040] Step 6, when the oxygen content of each soil monitoring point 31 is about 10%, the air pump is turned on through the central control system 7, and air is introduced into the biopile 11 through the air intake pipe 24 and the soil air guide pipe 25. Through the operation of air extraction and air intake, the ventilation in the biopile 11 is adjusted and improved to adjust and improve the growth environment of microorganisms, thereby achieving the purpose of repairing the polluted land.

[0041] The above embodiments are merely examples of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art may make simple changes or substitutions based on the above embodiments without departing from the technical concept of the present invention, but they still fall within the protection scope of the present invention.

Claims

1. An intelligent biopile remediation technology equipment for coal chemical pollution sites, characterized by: The leachate storage tank (1), the tonic tank (2) and the water replenishment tank (3) are connected in sequence. A water replenishment pump (5) is arranged on the pipeline between the tonic tank (2) and the water replenishment tank (3). The water replenishment pump (5) is connected to the nutrient water allocation water inlet pipe (20) and can uniformly inject microbial nutrient agents into the biopile (11). The water replenishment tank (3) is connected to the water reservoir through a pump (6). The nutrient water allocation water return pipe (26) is connected to the inlet end of the water replenishment pump (5) so that the uninjected microbial nutrient agents can flow back into the nutrient water allocation water inlet pipe (20); The gas outlet end of the gas-liquid separator (8) is connected to the activated carbon box (10) through the Roots blower (9), the inlet end of the gas-liquid separator (8) is connected to the exhaust main pipe (27), the exhaust main pipe (27) is connected to a plurality of exhaust branch pipes (16), the exhaust branch pipes (16) are inserted into the bottom of the biopile (11), the Roots blower (9) extracts a gas-liquid mixture into the biopile (11) through the exhaust main pipe (27) and the exhaust branch pipes (16), and the extracted gas-liquid mixture enters the gas-liquid separator (8) for Separation, the separated gas enters the activated carbon box (10) for filtration and discharge, and the separated liquid flows into the leachate storage barrel (1) for recycling and reuse. A plurality of air intake pipes (24) are arranged on the top of the biopile (11), and the air intake pipes (24) are located above the air extraction branch pipes (16). The air intake pipes (24) are connected to the soil air guide pipe (25), and the soil air guide pipe (25) takes air into the biopile (11) through an air pump. The Roots blower (9) and the air pump can extract air from the biopile (11); The gas-liquid separator (8) is also connected to the leachate storage barrel (1), and the extraction pump (4) extracts the collected microbial nutrient agent back into the leachate storage barrel (1) through the leachate collection pipe (17); A drip irrigation pipe (32) and a dripper (22) are arranged on the top of the biopile (11); the drip irrigation pipe (32) is connected to the nutrient water mixing water inlet pipe (20); the dripper (22) can uniformly inject microbial nutrient agents into the biopile (11); the leachate collection pipe (17) is arranged at the bottom of the biopile (11) for collecting microbial nutrient agents; an air extraction branch pipe (16) is also arranged at the bottom of the biopile (11); the air extraction branch pipe (16) is connected to the air extraction main pipe (27) for extracting the gas-liquid mixture in the biopile (11); a soil gas monitoring point (31) is arranged in the biopile (11); a soil gas probe (18) is arranged in the soil gas monitoring point (31) for real-time monitoring of the oxygen content, water content and carbon, nitrogen and phosphorus content ratio in the biopile (11); The central control system (7) is connected to the soil gas probe (18) by signal through a signal line (21). The central control system (7) is also connected to the extraction pump (4), the water replenishment pump (5) and the Roots blower (9) by signal respectively. The central control system (7) receives the signal from the soil gas probe (18) and controls the start and stop of the pump body and the blower, so as to evenly inject and ventilate the biopile (11). The central control system (7) is connected to the monitoring instrument by signal, and the data monitored by the soil gas probe (18) is displayed in real time on a large screen and stored and recorded.

2. The intelligent biopile remediation technology equipment for coal chemical pollution sites according to claim 1, characterized in that: The drip irrigation pipe (32) is provided with a regulating valve (30), the air extraction branch pipe (16) is provided with a control valve (28) and a flow meter (29), and the central control system (7) is connected to the regulating valve (30), the control valve (28) and the flow meter (29) via signals to control the opening and closing of the valve body and receive flow data.

3. The intelligent biopile remediation technology equipment for coal chemical pollution sites according to claim 1, characterized in that: A gravel air-conducting layer (13) is arranged at the bottom of the biopile (11), a geotextile (12) is arranged between the biopile (11) and the gravel air-conducting layer (13), a leachate collecting pipe (17) is arranged between the gravel air-conducting layer (13) and the concrete anti-seepage foundation (15), the concrete anti-seepage foundation (15) is arranged to be high at both sides and low in the middle, and the leachate is concentrated in the middle and enters the leachate collecting pipe (17), clean clay (14) is arranged around the gravel air-conducting layer (13), a covering film (23) is arranged above the biopile (11), and the covering film (23) is compressed and anchored with sandbags (19) around the four sides.

4. The intelligent biopile remediation technology equipment for coal chemical pollution sites according to claim 1, characterized in that: The leachate collecting pipe (17) has a slit on one side facing the biopile (11), with a slit width of 0.5 mm, a slit spacing of 1 cm, and a slit depth of 25 mm for collecting leachate.

5. The intelligent biopile remediation technology equipment for coal chemical pollution sites according to claim 1, characterized in that: The soil gas probe (18) comprises a temperature sensor, a humidity sensor, a nitrogen, phosphorus and potassium probe, a pH probe, a redox potential meter, an oxygen content monitoring device, a carbon dioxide monitoring device and a gas / liquid vortex flowmeter, and performs real-time monitoring of the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas of the biopile (11).

6. A method for repairing coal chemical pollution sites using intelligent biopile repair technology equipment, characterized in that: The following steps are involved: Step 1: Open the control valve (28), the flow meter (29) and the Roots blower (9) through the central control system (7), and perform air extraction by gradually increasing the air extraction flow rate to ensure that the air path in the biopile (11) is uniform and avoid the formation of a preferential channel; Step 2: During the gas extraction process, the flow rate in the gas extraction branch pipe (16) is monitored by the flow meter (29), and the Roots blower (9) extracts a gas-liquid mixture into the biopile (11) through the gas extraction main pipe (27) and the gas extraction branch pipe (16). The extracted gas-liquid mixture enters the gas-liquid separator (8) and is separated. The separated gas enters the activated carbon box (10) for filtration and is directly discharged. The separated liquid flows into the leachate storage barrel (1) and is supplied back to the tank for multiple use. Step 3, the soil gas probe (18) monitors the soil temperature, pH value, nitrogen, phosphorus and potassium content, humidity, pressure, redox potential and soil gas in the biopile (11) in real time. When the oxygen content at each soil monitoring point (31) is about 10%, the control valve (28), the flow meter (29) and the Roots blower (9) are closed through the central control system (7); Step 4, the regulating valve (30) and the water replenishment pump (5) are opened through the central control system (7), and the microbial nutrient agent and water in the replenishment tank (2) and the water replenishment tank (3) are uniformly injected into the biopile (11) through the dripper (22), and the soil moisture content and nitrogen, phosphorus, potassium content and other indicators in the biopile (11) are monitored in real time through the soil gas probe (18). When the moisture content in the biopile (11) is higher than 10% and the carbon, nitrogen and phosphorus content ratio reaches 100:10:1, the regulating valve (30) and the water replenishment pump (5) are closed through the central control system (7), and the injection of microbial nutrient agent and water into the biopile (11) is stopped; Step 5: The microbial nutrient agent infiltrates into the gravel air-conducting layer (13) and is collected and flows into the leachate collection pipe (17). The extraction pump (4) is turned on through the central control system (7) to collect the microbial nutrient agent in the leachate collection pipe (17) into the leachate storage tank (1) for recycling and reuse; Step 6: When the oxygen content at each soil monitoring point (31) is about 10%, the air pump is turned on through the central control system (7), and air is introduced into the biopile (11) through the air intake pipe (24) and the soil air guide pipe (25). Through the air extraction and air intake operations, the ventilation in the biopile (11) is regulated and improved, thereby achieving the purpose of repairing the polluted land.

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