Soil leaching system and soil leaching method

[0092] A soil washing system such as Figure 2-Figure 5 As shown, including: the soil to be repaired 5, the spray assembly 6 and the guide pipe 7;

[0093] The soil 5 to be repaired includes two grid areas 501, and the area of ​​each grid area 501 is 1000m 2 (50×20m), two adjacent grid areas 501 are separated by PVC board 502, and the depth of PVC board 502 is 0.8m;

[0094]The spray assembly 6 is arranged above the soil 5 to be repaired; the spray assembly 6 is divided into two groups, and a group of spray assemblies is arranged in each grid area 501, and each group of spray assemblies includes 5 spray pipes 601, adjacent to each other. The distance between two spray pipes 601 is 4m, and each spray pipe 601 is provided with 12 360° nozzles 602, and the flow rate of the nozzles 602 is 0.5m 3 / h, the spray area is 4m 2 , the spray assembly 6 also includes a water pump 603, the water pump 603 is connected with the spray pipe 601, and the flow rate of the water pump 603 is 30m...

[0097] A soil washing method, adopting the soil washing system in embodiment 1 to wash the soil, comprising:

[0098] (a) Conduct a survey on the status quo of the contaminated soil, and determine the scope of restoration to be 2000m 2 , the repair soil depth is 80cm.

[0099] (b) Divide the remediation soil range into two 1000m 2 The grid area is 20m×50m, and PVC panels are placed through excavation. The depth of the partitions is 80cm. The joints of the PVC panels are connected with flexible waterproof materials to prevent water penetration.

[0100] (c) Lay a 50m diversion main pipe on the soil bottom of each grid area by excavation, laying a slope of 2‰, slope direction discharge outlet, and setting 5 diversion branch pipes of 20m, with an interval of 8m between diversion branch pipes. The flow main pipes are connected; a number of 20mm seepage holes are set on the center line of the diversion pipe, and the total hole area accounts for 1 / 4 of the surface area of ​​the di...