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Heavy metal contaminated soil remediation method

A technology of polluted soil and remediation method, which is applied in the restoration of polluted soil, etc. It can solve problems such as pollution, damage to remediation devices, and hindrance to plant growth and development, and achieve the effects of improving screening efficiency, facilitating dredging, and improving work efficiency

Inactive Publication Date: 2019-05-10
叶淑源
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

② Elements required for normal growth and development of plants, and have certain physiological functions for the human body, such as copper, zinc, etc., but too much will cause pollution and hinder plant growth and development
[0003] However, some existing heavy metal-contaminated soil remediation devices directly put the remediation agent into the contaminated soil when remediating the contaminated soil, resulting in insufficient contact between the remediation agent and the contaminated soil, prolonging the repair time of the contaminated soil. For this reason, provide A method for remediating heavy metal-contaminated soil, which can increase the contact surface between remediation agents and contaminated soil, increase the pH value of contaminated soil, and promote the formation of hydroxide or carbonate-bound salts from heavy metal elements in the soil, improving soil remediation. The efficiency is high, and the polluted soil is initially crushed to remove the hard impurities in the polluted soil, avoiding hard impurities from damaging the repair device, and prolonging the service life of the repair device

Method used

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Embodiment Construction

[0038] use Figure 1 to Figure 6 A method for repairing heavy metal-contaminated soil of the present invention is described as follows.

[0039] Such as Figure 1 to Figure 6 Shown, a kind of remediation method of heavy metal contaminated soil of the present invention, the method comprises the steps:

[0040] S1: Take the finely ground quicklime and sieve out an appropriate amount of finely ground quicklime with a particle size of less than 0.2mm and a calcium oxide content between 80% and 90%, and react with water to generate calcium hydroxide to increase the pH value of the polluted soil; through calcium oxide and Water reacts to generate calcium hydroxide, which increases the pH value of polluted soil, promotes the formation of hydroxide precipitation of heavy metal elements in polluted soil, and effectively reduces the content of heavy metal elements in polluted soil;

[0041] S2: Coarsely crush the polluted soil to be repaired and remove hard impurities such as gravel i...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly discloses a heavy metal contaminated soil remediation method. The heavy metal contaminated soil remediation method includes steps of screening over-fine ground quicklime to obtain an appropriate quantity of fine ground quicklime with the particle sizes smaller than 0.2 mm and the calcium oxide content ranging from 80% to 90%, and carrying out reaction on the fine ground quicklime and water to generate calcium hydroxide so as to increase the PH (potential of hydrogen) value of contaminated soil; coarsely crushingthe to-be-remedied contaminated soil, removing hard impurities such as crushed stone in the contaminated soil, adding the coarsely crushed contaminated soil and the fine ground quicklime into stirring machines and stirring the coarsely crushed contaminated soil and the fine ground quicklime to obtain mixed soil; inputting the mixed soil into a tank of a heavy metal contaminated soil remediation device, sufficiently mixing appropriate quantities of soft calcium carbonate powder and clear water with each other, and then adding the soft calcium carbonate powder and the clear water into a soil remediation chemical tank on the tank; switching on a motor on the tank, allowing an outer barrel to rotate by the aid of the motor and smashing the mixed soil. The heavy metal contaminated soil remediation method has the advantages that hydroxide or carbonate combined-state salt precipitate forming by heavy metal elements in the soil can be promoted, and accordingly the soil remediation efficiencycan be improved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, in particular to a method for remediating heavy metal polluted soil. Background technique [0002] Among the soil inorganic pollutants, heavy metals are more prominent, mainly because heavy metals cannot be decomposed by soil microorganisms, but are easy to accumulate and transform into more toxic methyl compounds, and some even accumulate in the human body at harmful concentrations through the food chain, seriously endangering human health. Soil heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Although arsenic does not belong to heavy metals, it is usually included in it because of its behavior, source and hazards are similar to heavy metals. Heavy metals are discussed. As far as the needs of plants are concerned, metal elements can be divided into two categories: ① Elements that are not needed for plant growt...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 叶淑源王金玉倪岚霖
Owner 叶淑源
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