Polluted soil and underground water in-situ repair system

Abstract

The invention relates to a polluted soil and underground water in-situ repair system. The system comprises a permeation increasing wall, a waterproof curtain, an enclosing wall and a permeation increasing well; the waterproof curtain is arranged at the periphery of a polluted field for stopping outward dispersion of polluted feathers to stop dispersion of a surface active agent out of the field; the continuous permeation increasing wall is arranged in the polluted field for reinforcing the permeability of low-permeability soil; the permeation increasing wall is directly connected with a reactor; the permeation increasing well is arranged in the polluted field; the surface active agent is injected in the permeation increasing well to urge pollutants on the surface of stratum soil to enter a water phase; under pushing of a water head in the permeation increasing well, the pollutants and polluted underground water flow to the permeation increasing wall along with underground water currents, and flow into the reactor for reduction and oxidation reactions; and purified underground water is filled back into the permeation increasing well so as to realize in-situ repair of organic polluted soil and underground water as nitrobenzene or nitro-chlorobenzene. The system dose not excavate the polluted field and extract the polluted underground water, is free of secondary pollution, and is low in engineering cost.

Description

technical field [0001] The invention relates to an in-situ repair system for organic polluted sites, in particular to an in-situ repair system for nitrobenzene and nitrochlorobenzene pollution in low-permeability soil sites. Background technique [0002] Groundwater is an important resource for human survival, and the pedosphere is the hub of the ecosystem. Due to the improper management and control of the three wastes, groundwater and soil have been polluted to varying degrees, and risk control and restoration are imperative. Currently, the remediation of contaminated sites includes two methods: in-situ remediation and ex-situ remediation. Ex-situ restoration needs to extract groundwater, excavate soil, and take protective measures in soft soil areas, which is expensive and prone to secondary pollution. It is suitable for sites with low pollution depth. In-situ restoration has the advantages of no need for earthwork excavation, less secondary pollution, and low cost; howe...

AI Technical Summary

Problems solved by technology

This technology is not suitable for low-permeability soils, and cannot be eluted and purified for pollutants with strong adsorption capacity.

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