Method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants

Abstract

A method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants belongs to the technical field of environmental protection. The method uses direct-current weak electric field to stimulate the growth of plants and improve the ability of the plants to adsorb and accumulate heavy metals. The method comprises: inserting a pair of electrodes into soil, with plant rootspositioned between the electrodes and the depth of the electrodes equal to plant root length; applying unidirectional direct-current weak electric field between the electrodes for exciting purpose, tobe specific, cultivating restoring plants under the weak electric field, dividing to obtain restoration belts, clearing them, installing a restoration device, planting restoring plants, and providingcontinuous power. The method has the advantages that the direct-current weak electric field is applied to a soil region under restoration, migration of the heavy metal contaminants in the soil is quickened, the growth of the plants is stimulated by the electric field, and the ability of the plants to adsorb heavy metals is improved as well; the method is simple to perform, low in cost and high inefficiency, is suitable for in-situ treatment of contaminated soil, and never causes a risk to the surroundings.

Description

technical field [0001] The invention relates to a method for enhancing phytoremediation of heavy metal polluted soil by using a direct current electric field. It belongs to the technical field of environmental protection. Background technique [0002] In recent years, with the continuous development of the modernization of industrial and agricultural production, the problem of soil pollution by heavy metals in my country has become increasingly serious, especially the cadmium in the soil cannot be degraded and the cadmium content exceeds the standard. Nowadays, a large amount of soil cannot be cultivated. Soil pollution will not only reduce the export of agricultural products, cause direct economic losses, but even pose a huge threat to the ecological environment. At present, soil pollution has become an important factor affecting human health and threatening the safety of agricultural products. Therefore, the remediation research of heavy metal pollution is urgent. [00...

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Problems solved by technology

Although these technologies have their own advantages, in actual operation, physical remediation technology is slow to take effect, chemical remediation technology is likely to cause secondary pollution, and some technologies are large in volume, complicated in process and high in cost. It is difficult to implement in the project, so the methods mentioned above are difficult to become an efficient and environmentally friendly soil remediation technology

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