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CN-121988597-A - Device and method for repairing underground water based on soil vapor extraction technology

CN121988597ACN 121988597 ACN121988597 ACN 121988597ACN-121988597-A

Abstract

The application discloses a device and a method for repairing groundwater based on a soil vapor extraction technology in the technical field of environmental remediation, wherein the device comprises a base, and an air supply device, a water liquid collecting box, a gas purifying device, a pump and a gas-liquid separator which are arranged on the base, wherein an exhaust pipe is arranged at an outlet of the air supply device, an extraction pipe is arranged at an inlet of the gas-liquid separator, an air hole is arranged on the extraction pipe, a shield for covering the air hole is arranged on the extraction pipe, the shield comprises a shield body, a top cover and a driving assembly, and one side, far away from the top cover, of the shield body is conical.

Inventors

  • LIU CHANG
  • HU JIE
  • ZHANG QIN
  • HUA JING
  • HU FEILONG
  • ZHANG CONG

Assignees

  • 生态环境部南京环境科学研究所

Dates

Publication Date
20260508
Application Date
20260121

Claims (9)

  1. 1. The device for repairing the underground water based on the soil vapor extraction technology comprises a base (1), and a gas supply device (2), a water liquid collecting box (3), a gas purifying device (4), a pump (5) and a gas-liquid separator (6) which are arranged on the base (1), wherein an exhaust pipe (7) is arranged at the outlet of the gas supply device (2), an extraction pipe (8) is arranged at the inlet of the gas-liquid separator (6), and an air hole (11) is arranged on the extraction pipe (8), and the device is characterized in that a shield (9) for covering the air hole (11) is arranged on the extraction pipe (8); The shield (9) comprises a shield body (901), a top cover (902) and a driving assembly, wherein one sides of the shield body (901) and the top cover (902) which are far away from each other are tapered, and the driving assembly is used for driving the top cover (902) to be far away from the shield body (901) after the extraction pipe (8) is inserted into a preset area.
  2. 2. The device for repairing groundwater based on a vapor extraction technology according to claim 1, wherein the driving assembly comprises a containing groove (904) arranged on the cover body (901), a moving block (903) which is arranged in the containing groove (904) in a sliding manner and is connected with the top cover (902), a through hole (905) which is arranged on the inner side wall of the cover body (901) and is communicated with the containing groove (904), an air injection hole (12) which is arranged on the outer side of the extraction pipe (8) and is positioned on the inner side of the cover body (901), and a conduit (10) which is communicated with the air injection hole (12).
  3. 3. The device for repairing groundwater based on the soil vapor extraction technology according to claim 2, wherein a limit groove (906) is arranged on the inner side wall of the storage groove (904), an installation groove (907) is arranged on the moving block (903), an opening is arranged on the side wall of the installation groove (907), a limit block (910) and a flexible connecting piece (911) connected with the limit block (910) are slidably arranged in the opening, and a movable block (908) for extruding the flexible connecting piece (911) and an elastic piece (909) connected with the movable block (908) are slidably arranged in the installation groove (907).
  4. 4. The device for restoring groundwater based on the soil vapor extraction technology according to claim 1, wherein the end of the extraction tube (8) far away from the gas-liquid separator (6) is provided with a conical stop.
  5. 5. The device for repairing groundwater based on the soil vapor extraction technology according to claim 1, wherein an annular groove (14) is arranged at one end of the exhaust pipe (7) far away from the air supply equipment (2), an annular piece (16) is arranged in the annular groove (14), a stop block (13) for blocking the tail end of the exhaust pipe (7) is arranged on the annular piece (16), and an air inlet hole (15) for communicating with the annular groove (14) is arranged on the inner side wall of the exhaust pipe (7).
  6. 6. The device for restoring groundwater based on vapor extraction technology according to claim 5, characterized in that said ring (16) comprises a sieve (161) and an annular block (162) connected to the sieve (161).
  7. 7. The device for restoring groundwater based on vapor extraction technology according to claim 5, characterized in that the end of said exhaust pipe (7) is provided with a magnetic element for adsorbing the stopper (13).
  8. 8. Device for restoring groundwater based on a soil vapor extraction technique according to claim 1, characterized in that the base (1) is provided with a pushing assembly (17) for inserting the exhaust pipe (7) and the extraction pipe (8) into the soil.
  9. 9. A method for restoring groundwater based on a soil vapor extraction technology, which is a device for restoring groundwater based on a soil vapor extraction technology according to any one of claims 1-8, comprising the following steps: S1, respectively inserting an exhaust pipe (7) and an extraction pipe (8) into corresponding depths of soil, driving a top cover (902) to move away from a cover body (901) by a driving assembly, and opening an air hole (11); S2, starting the air supply equipment (2), supplying air to the underground water of the soil through the exhaust pipe (7), starting the gas-liquid separator (6), enabling the gas phase extraction pipe (8) to generate suction force to the gas in the soil, enabling the gas to enter the gas-liquid separator (6) through the air hole (11) and the extraction pipe (8) for separation, enabling the liquid generated by separation to enter the water-liquid collecting box (3), enabling the rest of the gas to enter the gas purification equipment (4) through the pump (5) for purification, and then discharging.

Description

Device and method for repairing underground water based on soil vapor extraction technology Technical Field The invention relates to the field of environmental remediation, in particular to a device and a method for remediating groundwater based on a soil vapor extraction technology. Background The soil vapor extraction technology is mainly used for removing volatile organic pollutants in the soil of the air-covered zone; in practical engineering, SVE is often combined with air injection technology to realize cooperative treatment of shallow groundwater pollution, and an extraction well is arranged in an unsaturated zone to induce the volatilization of pollutants in groundwater and extract the pollutants to a surface treatment system, wherein one of core components of the technology is an extraction pipe embedded in a polluted area, and the lower part of the extraction pipe is provided with a sieve pipe section or an air hole for sucking the soil gas containing the pollutants; However, the device has defects in use, when the extraction well is installed by adopting a drilling backfilling process, high-permeability filter materials (such as clean coarse sand or gravel) are filled around the sieve tube section to enhance the gas guiding performance and prevent fine particles from invading, but as the opening above the conical cover is not shielded, a large amount of filter materials can directly fall into the cavity inside the conical cover in the process of backfilling the filter materials from top to bottom and are accumulated at the bottom of the extraction tube or block a gas hole channel to weaken the extraction efficiency, and the conical cover adopts a rigid integrated structure, the outer diameter of the conical cover is usually larger than that of the extraction tube body, so that the whole upward moving resistance of the extraction tube is increased. Disclosure of Invention The invention aims to provide a device and a method for repairing groundwater based on a soil vapor extraction technology, which solve the defects existing in the use of the conical shield with the existing air holes. The device for repairing the underground water based on the soil vapor extraction technology comprises a base, and air supply equipment, a water liquid collecting box, air purification equipment, a pump and a gas-liquid separator which are arranged on the base, wherein an exhaust pipe is arranged at an outlet of the air supply equipment, an extraction pipe is arranged at an inlet of the gas-liquid separator, air holes are formed in the extraction pipe, and a shield for covering the air holes is arranged on the extraction pipe; the shield comprises a shield body, a top cover and a driving assembly, wherein one sides, far away from the top cover, of the shield body are tapered, and the driving assembly is used for driving the top cover to be far away from the shield body after the extraction pipe is inserted into a preset area. Preferably, the driving assembly comprises a storage groove arranged on the cover body, a moving block which is arranged in the storage groove in a sliding manner and connected with the top cover, a through hole which is arranged on the inner side wall of the cover body and communicated with the storage groove, an air injection hole which is arranged on the outer side of the extraction pipe and positioned on the inner side of the cover body, and a guide pipe which is communicated with the air injection hole. Preferably, the limiting groove is formed in the inner side wall of the storage groove, the mounting groove is formed in the moving block, an opening is formed in the side wall of the mounting groove, a limiting block and a flexible connecting piece connected with the limiting block are arranged in the opening in a sliding mode, and a movable block used for extruding the flexible connecting piece and an elastic piece connected with the movable block are arranged in the mounting groove in a sliding mode. Preferably, one end of the extraction pipe far away from the gas-liquid separator is provided with a conical stop block. Preferably, one end of the exhaust pipe far away from the air supply equipment is provided with an annular groove, an annular piece is arranged in the annular groove, a stop block for blocking the tail end of the exhaust pipe is arranged on the annular piece, and an air inlet hole for communicating with the annular groove is formed in the inner side wall of the exhaust pipe. Preferably, the ring member includes a screen and a ring block connected to the screen. Preferably, a magnetic piece for adsorbing the stop block is arranged at the end part of the exhaust pipe. Preferably, a pushing component is arranged on the base, so that the exhaust pipe and the extraction pipe are inserted into the soil. Preferably, a method for repairing groundwater based on a soil vapor extraction technology, which utilizes the device for repairing groundwater based on the soil vapor extraction