The use of advanced oxidation processes for remediation of heavy metals and radionuclides contaminated soils and sediments in a closed process loop

摘要

The process of the present invention which relates to "The use of advanced oxidation processes for remediation of heavy metals and radionuclides contaminated soils and sediments in a closed process" solves problems of contaminated soil/sediment. Soil/sediment is excavated and mounded on drainage. Chelating agents in a washing solution are used to wash metals and radionuclides from the soil/sediment as chelate complexes. Supporting compounds in the washing solution remove organic pollutants. Advanced oxidation, preferably ozonation/UV, is used for degradation of complexes and organic pollutants in the washing solution. Released metals/radionuclides are absorbed. The treated washing solution is reused for soil/sediment rinsing in a closed process loop, to remove residual complexes, and as a medium for the chelating agent and supporting compounds in multiple washing steps. Remediated soil/sediment is returned to the original place or deposited. The process saves water, produces no harmful emissions and is gentle to the soil.