Method for restoring soil polluted by heavy metal through porous medium particles

A technology for porous media and polluted soil, applied in the field of soil environmental pollution control, can solve the problems of low environmental risk, high cost and large environmental disturbance in ex-situ treatment, and achieve the effect of improving ion exchange capacity, low cost and huge environmental benefit.

Active Publication Date: 2016-08-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ectopic treatment has low environmental risk, quick results and high predictability of system treatment, but high cost and great disturbance to the environment

Method used

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Examples

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Embodiment

[0021] Biomass semi-coke was used as soil remediation agent to remediate the soil with excessive heavy metal cadmium content in the soil. The cultivation in this area adopts the furrow and ridge cultivation method, and the height difference between the furrow and ridge is about 300mm. In order to prevent the soil remediation agent layer from exposing the soil surface, biomass semi-coke is added to the top of the ridge 400mm below the soil surface to form a semi-coke with a thickness of 50mm. Coke restorer layer. The soil above the soil remediation agent layer is normally tilled. The local average annual rainfall is 600mm, and normal agricultural irrigation has been carried out. After 12 months, soil heavy metal detection was carried out, and the cadmium content in the upper soil layer of the soil remediation agent layer was reduced from 0.95 mg / kg to 0.15 mg / kg, meeting the requirements of the national standard for soil heavy metals. Afterwards, the soil on the upper part of...

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Abstract

The invention discloses a method for restoring soil polluted by heavy metal through porous medium particles. The method includes the steps that the porous medium particles are used as a soil restoration agent, the soil restoration agent is added at the position which is a certain depth below the soil surface layer, and a soil restoration agent layer is formed and used for absorbing heavy metal elements carried by moisture coming from soil on the upper layer. As the restoration agent is placed in a concentrated and layered shape, compared with a disperse placement manner, a path for conveying the heavy metal elements to the deep portion of soil is completely isolated, the soil restoration agent can be conveniently taken out from the soil in a concentrated manner subsequently, and the treatment difficulty of porous medium raw materials which absorb heavy metal is reduced. Compared with the prior art, the method has the beneficial effects that the heavy metal elements can be rapidly, efficiently, conveniently and rapidly removed from the soil, and the method is economical and practical.

Description

technical field [0001] The invention relates to a soil remediation method, in particular to a method for remediating heavy metal-polluted soil by using porous medium particles, and belongs to the field of soil environmental pollution control. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metals refer to about 45 elements with a density above 5.0. Arsenic and selenium are non-metals, but their toxicity and certain properties are similar to heavy metals, so they are included in the scope of heavy metal pollutants. China's first soil survey shows that nearly 20% of China's arable land has heavy metals such as cadmium, arsenic, mercury, lead, nickel, copper exceeding the standard. These heavy metals can be absorbed by crops and enter the food ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C2101/00
Inventor 由长福
Owner TSINGHUA UNIV
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