a soil remediation method

Abstract

The invention discloses a soil remediation method, and relates to the technical field of soil remediation. The soil remediation method is technically characterized by comprising the following steps ofdigging the polluted soil, sampling, and detecting the concentration of the pollutants; putting the polluted soil into a freezing system to freeze; conveying the frozen soil to a first drying devicevia a belt conveyor; screening the soil, feeding the screened soil into a stirring machine, adding a remediation agent according to the detected concentration of the pollutants, and fully stirring until the slurry form is formed; filtering the slurry soil, so as to respectively obtain solid soil and filtrate; treating the solid soil, until the sample is qualified in detection; adding straw and animal excrement into the qualified soil in detection, fermenting, and backfilling the fermented soil to the original location. The soil remediation method solves the problem of decomposing and loss of organic nutrients in soil due to high-temperature pyrolysis in the existing soil remediation process, and is suitable for improving the soil fertility in the soil remediation process.

Description

technical field [0001] The invention relates to the technical field of soil remediation, more specifically, it relates to a soil remediation method. Background technique [0002] Soil provides living space and important ecosystem services for humans, and plays an important role in human life. For example, soil stores and filters water, improving food security; functional soils play a key role in supplying clean water and resisting drought; soil percolating water traps pollutants and prevents them from penetrating into groundwater; fertile soil is a natural “storage "Water tank", which can fix the base of plant roots, etc. With the development of industrialization and urbanization, the problem of soil pollution has become increasingly serious, which has affected food safety and sustainable agricultural development. The soil is a resource that is difficult to regenerate, and it is urgent to protect the soil. [0003] The prior art refers to the Chinese invention patent with...

AI Technical Summary

Problems solved by technology

This invention can effectively reduce the concentration of heavy metal pollutants mercury and polycyclic aromatic hydrocarbons in the soil, but it has the following disadvantages: when the soil is subjected to high-temperature pyrolysis above 500 ° C, the fertile organic nutrients in the soil are removed, and the soil becomes fertile after remediation. The force is greatly reduced, affecting the use of planting

This invention can better solve the problem of soil pollution, and the repair process cost is relatively low, but it has the following disadvantages: when the soil is subjected to high temperature pyrolysis above 500°C, the fertile organic nutrients in the soil are removed, and the fertility of the soil is greatly reduced after the repair , can only be used as commercial land soil, but not for crop cultivation, which reduces the utilization rate of crop land

However, there are the following disadvantages: when high-temperature oil and gas are formed during the remediation process, the temperature of the soil in the thermal desorption zone is above 400°C, so that the fertile organic nutrients in the soil are removed, and the fertility of the soil is greatly reduced after the remediation, so it can only be used for commercial use. Use land soil instead of crops, reducing the land use efficiency of crops

[0006] To sum up, the traditional way of using thermal desorption technology to repair soil can remove harmful substances in the soil, but at the cost of reducing soil fertility. The repaired soil is mostly used for commercial land soil, reducing agricultural Use of soil content that is not conducive to sustainable agricultural development

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