Eluent for repairing contaminated soil, and preparation method and application thereof

Abstract

The present invention provides an eluent for repairing contaminated soil. The eluent comprises, by weight, 50-70 parts of a nonionic biosurfactant and 5-30 parts of an anionic surfactant. The compounding synergism of the nonionic biosurfactant and the anionic surfactant enhances the solubilizing effect of the eluent on organic pollutants in soil, especially polycyclic aromatic hydrocarbons, so theelution efficiency of the eluent is significantly improved; and the components of the elutent are biodegradable, so the eluent does not cause secondary damage to the environment in the use process, and is an efficient, clean and environmentally-friendly in situ eluent for repairing contaminated soil. The eluent provided by the invention is firstly foamed in the use process, so the spreading efficiency of an eluent solution in the soil medium is increased, the migration of the eluent in the horizontal direction is enhanced, and the uniformity and the repairing efficiency of the eluent in the soil are further improved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a leaching agent for remediating polluted soil, a preparation method and application thereof. Background technique [0002] With the promulgation and implementation of policies such as "retreating from the second to the third" and "retreating from the city into the park", all parts of the country have taken measures to relocate heavy polluting enterprises such as coking plants and chemical plants to the outer suburbs. Production will inevitably cause soil and groundwater pollution. The coking production process usually includes three departments: coal preparation, coking, chemical product recovery and utilization. In the above production process, various types of harmful pollutants, especially organic pollutants, are produced. Among them, polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons) , PAHs) and benzene series are the two m...

AI Technical Summary

Problems solved by technology

[0005] In-situ surfactant leaching technology is a hot spot in the remediation of soil organic pollution in recent years. However, in the existing technology, the traditional surfactant leaching technology is limited by the low permeability and heterogeneity of the formation medium, making the liquid phase The eluent is prone to pore effect, and it is difficult for the eluent to cover the entire contaminated area, resulting in low leaching efficiency; more importantly, the eluent and the injected target drug solution are greatly affected by gravity, making their migration difficult to control , it is easy to enter the aquifer, which further expands the polluted area

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