In-situ remediation system for contaminated soil and remediation method for ammonia nitrogen contaminated soil

Abstract

The invention relates to a remediation technology in the field of soil pollution treatment, and particularly discloses an in-situ remediation system for contaminated soil and a method for remediatingammonia nitrogen contaminated soil by using the remediation system. The remediation system for the contaminated soil comprises a ventilation shaft, an extraction well, a gas extraction device, a gas-liquid separation device, a gas treatment device and a waste liquid collection device, wherein the gas treatment device is an acid washing tower. According to the invention, ammonia nitrogen gas is extracted from the ammonia nitrogen contaminated soil through the gas extraction device in the remediation system, and is then separated from water by using the gas-liquid separation device; the separated ammonia nitrogen gas is subjected to acid pickling via the gas treatment device; and waste liquid is collected through the waste liquid collection device. The soil remediation system and method provided by the invention are low in cost, safe and controllable in use and capable of rapidly remediating the ammonia nitrogen contaminated soil, and overcome the problem of secondary pollution to environment.

Description

technical field [0001] The invention relates to the technical field of soil pollution control and repair, in particular to an in-situ repair system for polluted soil and a method for repairing ammonia nitrogen polluted soil by using the repair system. Background technique [0002] The main sources of ammonia nitrogen pollutants in the soil of industrial sites are industrial production enterprises such as nitrogen fertilizer production enterprises, as well as chemical plants and chemical drug production enterprises (the production process involves ammonia water, ammonium and other chemical raw materials), in the production workshop, subpackaging workshop, drug storage Leakage of medicines during transportation in warehouses and factory areas. A large amount of ammonia nitrogen pollutants directly enter the soil and are adsorbed on the inner and outer surfaces of soil particles. Due to its strong volatility, it is easy to diffuse in the soil, thereby causing a larger area of ​...

AI Technical Summary

Problems solved by technology

[0006] 2. There is secondary pollution

[0008] 3. Large amount of work and high cost

[0009] For sites with deep ammonia nitrogen pollution, in the process of ectopic normal temperature desorption restoration, it is necessary to excavate the contaminated soil in sections and layers, and then backfill it to the original contaminated site after disposal. This process requires a large amount of engineering and requires a larger site to stack the contaminated soil , and the cost is higher

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