Soil remediation method based on heavy metals

Abstract

The invention discloses a soil remediation method based on heavy metals and belongs to the technical field of heavy metal soil remediation. The method comprises the following steps of: ditching and bedding to-be-treated soil to form furrows and ridges arranged in a pairwise spaced mode; installing irrigation mechanisms used for irrigation in the furrows, wherein the irrigation mechanism is used for uniformly leaching the interior of soil; pumping a leacheate after primary leaching is pumped through an external water pump; removing partial harmful substances and heavy metals which are easy to flow in the soil; subsequently, continuously and moderately irrigating the interior of the soil; intensifying the flowability of substances in the soil; and making heavy metals and harmful substances in a free state move to the heavy metal adsorption wall. The harmful substances are subjected to adsorption reaction through the adsorption permeable wall, and heavy metals are adsorbed to the heavy metal restoration body through water flow to be adsorbed and passivated by a porous medium, so that comprehensive and balanced restoration treatment of heavy metal soil is effectively realized, the contents of the heavy metals and the harmful substances in the soil are effectively reduced, and the adsorption treatment time is shortened.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil remediation, and more specifically, relates to a soil remediation method based on heavy metals. Background technique [0002] Heavy metals refer to metals with a specific gravity equal to or greater than 5.0. Heavy metals that pollute soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity. And zinc (Zn), copper (Cu), nickel (Ni) and other elements with certain toxicity. Mainly come from pesticides, wastewater, sludge and atmospheric deposition, etc. For example, mercury mainly comes from mercury-containing wastewater, cadmium and lead pollution mainly comes from smelting emissions and vehicle exhaust deposition, and arsenic is widely used as insecticides, fungicides, and rodenticides and herbicides. Excessive heavy metals can cause plant physiological dysfunction and nutritional imbalanc...

AI Technical Summary

Problems solved by technology

Scattered application of remediation agents blocks the transport of heavy metal elements to the deep soil to a certain extent, and facilitates subsequent removal of soil remediation agents from the soil, reducing the difficulty of processing porous media raw materials after absorbing heavy metals. The mobility of heavy metal pollutants in the soil is very small, and the adsorption process by the adsorbent is long, and some adsorbents are distributed in a dispersed manner, so it is difficult to comprehensively adsorb and filter out the heavy metals in the soil

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