Contaminated land remediation method

Abstract

The invention discloses a contaminated land remediation method. The method comprises the following steps: screening soil, cleaning solid substances, washing by selection, performing solid-liquid separation, performing soil detection, performing electric flocculation water treatment, precipitating and performing filter-press solid-liquid separation, wherein in the step of washing by selection, toxic soluble heavy metal ions, pesticides, plant catalytic agents and soluble organic matters in the soil are dissolved in water; and in the electric flocculation water treatment, heavy metal ions and organic matters in the water are converted into solid substances by virtue of electrochemical reaction and are flocculated from the water, so that the heavy metal ions and the organic matters comprising the pesticides, bacteria and viruses in a filter-press aqueous solution are removed. The method disclosed by the invention has the technical effects that the heavy metal ions in cleaning water are effectively removed under the condition that any chemical is not added, the physicochemical characteristics of the original soil are reduced, the full-automatic operation can be realized, the water treatment time is reduced, the remediation efficiency is improved, and the remediation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of the field of environmental protection, and in particular relates to a method for remediating polluted land. Background technique [0002] Chinese patent document CN 103861867 A disclosed a soil remediation process by leaching method on June 18, 2014. The steps include feeding, primary sieving separation, fine sieving separation, acid stirring tank oxidation, solid-liquid separation, reduction of metal ions, Precipitation of metal ions, flocculation of organic insolubles, precipitation separation and pressure filtration treatment. Among them, the primary sieve leaching and fine sieve leaching separate the heavy metal ions and other pollutants from the soil into the water; the oxidation of the acid stirring tank combines the metal ions with the anions in the acid and dissolves them in the water; the solid-liquid separation separates the sediment Separation from aqueous solution; reduction of metal ions is ...

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Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the technical problem to be solved by the present invention is to provide a method for remediating polluted land without adding chemicals, which can simply and quickly decontaminate heavy metals, pesticides, plant growth agents, etc. Pollutants are removed to restore the original physical and chemical characteristics of the land; it meets the relevant national land restoration standards, and the land can be adjusted according to the new planned use; the process is simplified, the treatment efficiency is high, and the soil washing water is all recycled, without Secondary pollution of land, low cost, can effectively solve the problem of large-scale land pollution restoration

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