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In recent years, along with the acceleration of urbanization and the transfer of industries in our country and the implementation of the policy of "retreating from two to three" and "withdrawing from the city into the park", a large number of persistent organic pollutants (POPs, persistent organicpollutions) contaminated sites. Most current POPs sites are facing conversion and secondary development of land use functions such as commercial sites, residential buildings and so on. The potentially high-risk contaminated soils in these sites will become "chemical time bombers" of mankind, posing a serious threat to human health and environmental security. At present, it has become an urgent need to solve the soil environmental problems. Soil remediation technologies in persistent organic pollutants are widely used in actual site remediation because of their good effect, short period and low cost. Among them, the soil leaching and repair technique is a commonly used method in physical and chemical restoration.
Soil washing at persistent organic pollutants is one of the most commonly used techniques for remediation of soils in contaminated sites. Leaching method refers to the use of a specific washing agent for deep washing of contaminated soil by separating and cleaning the eluent to achieve reuse integration to achieve the purpose of removing contaminants in the soil and eventually safe disposal of pollutants and soil repair process . Based on the difference of the soil treatment site, the type of eluent and the application mode of eluent in the contaminated site, this paper divided the soil elution method into different types in the site of persistent organic pollutants. In order to achieve the efficient removal of pollutants in the soil, Multi-stage leaching mode, ultrasonic mode, electrokinetic mode and chemical oxidation, etc. The soil remediation efficiency, the nature of contaminants, the properties of eluent, the optimization of elution conditions and the efficiency of eluent recycling The significant impact of factors on the overall effectiveness of the leaching and repair; at the same time pointed out the current problems of soil washing at the site of persistent organic pollutants and future research and application of the direction. Considering the applicable scope and cost factors of soil leaching and remediation technology, it is considered that the leaching method is a kind of remediation technology that is more in line with the actual situation of the soil in the site of persistent organic pollutants in our country, and has strong pertinence and wider application prospect.
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