Nonhomogeneous soil pollutant multiphase extraction and tail gas purifying device, and application method thereof

A nonhomogeneous soil pollutant multiphase extraction and tail gas purifying device, comprising two water retaining walls (5), a water layer extraction system (6) and a near-water soil layer extraction system (7) arranged in a groundwater layer (2) between the two water retaining walls (5), a nonhomogeneous soil layer extraction system (9) arranged at a nonhomogeneous soil layer (4) in a homogeneous soil layer (3), a geophysical prospecting system (8) arranged at a top of the homogeneous soil layer (3), and a main connection pipeline (11) connected in parallel to the water layer extraction system (6), the near-water soil layer extraction system (7), the nonhomogeneous soil layer extraction system (9) and the water layer extraction system (6);

• a dosing and steam integrated device (10) connected to one end of the main connection pipeline (11), and a tail gas purifying apparatus (12) connected to the other end of the main connection pipeline (11);
• wherein the groundwater layer (2) is located below the nonhomogeneous soil layer (4), the homogeneous soil layer (3) is located above the groundwater layer (2), the nonhomogeneous soil layer (4) is located inside the homogeneous soil layer (3), and a pollution point (16) is located above the nonhomogeneous soil layer (4);
• pollutants of the pollution point (16) are organic matter volatile pollutants;
• the water layer extraction system (6) comprises an extraction outer cylinder (61), a extraction inner cylinder (62) detachably connected to the inside of the extraction outer cylinder (61), a horn connector (63) connected to the top of the extraction outer cylinder (61) or a straight connector (64) connected to the top of the extraction outer cylinder (61), a water layer gas delivery pipeline (65) and a water-layer fluid-conveying pipeline (67) connected to the top of the horn connector (63) or the straight connector (64), a water layer extraction pump (66) connected to the water layer gas delivery pipeline (65), and a water layer circulation pump (68) connected to the water-layer fluid-conveying pipeline (67);
• a gas delivery pipeline and the water-layer fluid-conveying pipeline (67) are both connected to the tail gas purifying apparatus (12) and are correspondingly provided with a valve (13);
• the water-layer fluid-conveying pipeline (67) is also connected to the water supply tank (69);
• the liquid extraction inner cylinder bottom (622) part extends out of the outer extraction cylinder (61), and the liquid extraction inner cylinder (62) extends into a water body;
• the dosing and steam integrated device (10) comprises separate dosing chamber and pressurized hot steam chamber, and both the dosing chamber and the pressurized hot steam chamber are respectively detachably connected to the main connection pipeline (11);
• the main connection pipeline (11) is provided with a valve (13) corresponding to the water layer extraction system (6), the near-water soil layer extraction system (7), the nonhomogeneous soil layer extraction system (9), and the water layer extraction system (6);
• the main connection pipeline (11) comprises a main connection pipe body (111) connected to the tail gas purifying apparatus (12), a main connection pump (112) connected to the main connection pipe body (111), and a main connection liquid pipe (113) connected between the main connection pipe body (111) and the tail gas purifying apparatus (12).