Method and structure for remediating cadmium-contaminated soil through combination of sulfur, two-dimensional electric field and plants

Abstract

The invention relates to the technical field of soil pollution treatment, specifically to a remediation method and structure for remediating cadmium-contaminated soil by combining a chemical reagent with a two-dimensional electric field and hyperaccumulation plants. According to the structure, sulfur is used as a chemical remediating agent, the two-dimensional electric field is constructed, and the cadmium-hyperaccumulation plants are cooperatively used to realize the remediation of the cadmium-contaminated soil; the two-dimensional electric field is composed of a cathode electrode located ata horizontal position of a soil surface layer and anode electrodes located at a lower horizontal position; the cathode electrode is located at the midpoint of a connecting line of the two anode electrodes; the cadmium-hyperaccumulation plants are planted in horizontal intervals between the anode electrodes and the cathode electrode; the sulfur layer is arranged on the surface layer of soil; and the anode electrodes and the cathode electrode are respectively connected to a power supply system. By utilizing the activation capability of sulfur to heavy metals in soil and the directional migrationcapability of the two-dimensional electric field on heavy metals, the extraction efficiency of hyperaccumulation plants on the heavy metals in the soil can be effectively improved, and the leaching risk of the heavy metals in a chemical induction process is reduced.

Description

technical field [0001] The invention relates to the technical field of soil pollution treatment, in particular to the field of restoration and treatment of heavy metal-contaminated soil, and more specifically relates to the structure and method of sulfur-two-dimensional electric field-plant joint restoration of cadmium-contaminated soil. Background technique [0002] With the acceleration of industrialization and urbanization, sewage irrigation, large-scale discharge of "three wastes" from heavy-duty enterprises, and unreasonable use of pesticides and fertilizers have caused the problem of heavy metal pollution in my country's farmland to become increasingly serious. According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, 19.4% of my country's cultivated land soil points exceeded the standard. Inorganic pollutants such as heavy metals exceeding the standard accounted...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to arrange the electric field reasonably, so as to not only solve the problems of short root system, low heavy metal accessibility and low effectiveness in phytoremediation, but more importantly, the method should have Operability in practical applications

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