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Method for treating heavy metal polluted soil

A technology for contaminated soil and heavy metals, applied in the field of heavy metal-contaminated soil, can solve the problems of expensive chemical complexing agents, lack of universal applicability, low repair efficiency, etc., to reduce ecological risks, simple facilities, and low treatment costs Effect

Inactive Publication Date: 2009-10-21
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have shortcomings: the heavy metals fixed in the soil can still be released from the soil when the environmental conditions change; chemical complexing agents are expensive and prone to secondary pollution; electrokinetic repair is limited by the buffer properties of the soil , soil components, ion composition of soil solution, and ion types of polluting metals are greatly affected, and are not universal; microorganisms and phytoremediation are greatly restricted by human and natural factors, and their growth is slow and their growth cycle is long. Therefore, the repair efficiency is low
Therefore, it is difficult to remove all of them with a single treatment method, and the development of soil treatment methods suitable for heavy metal polluted areas is the development direction of this research field

Method used

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  • Method for treating heavy metal polluted soil
  • Method for treating heavy metal polluted soil
  • Method for treating heavy metal polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Remove the soil surface layer 3 in the heavy metal polluted area and replace the clean soil; use the isolation layer 1 to isolate the subsurface layer 4; lay underground blind pipes 2 to guide water; lay an anti-seepage film 9 between the subsurface layer 4 and the surface layer 3, The underground blind pipe 2 is arranged below the surface layer 3 and above the anti-seepage membrane 9 for guiding and draining surface water.

[0022] The specific implementation method (see figure 1 ):

[0023] 1. The physical method of the concrete structure used in isolation layer 1 is: use concrete to build a 2m long, 2m wide, and 1m high cement pool. The height of the top of the cement pool from the ground is 0.5m, and the bottom is not closed.

[0024] 2. Cover the subsurface layer 4 contaminated soil with a height of 1.0m at the bottom of the cement pool, and the soil compactness is close to the density of the original contaminated soil; the concentrations of the original soil poll...

Embodiment 2

[0031] The difference from Example 1 is that there is no anti-seepage film 9 between the surface layer 3 and the subsurface layer 4, and the underground blind pipe 2 is arranged below the subsurface layer 4 for guiding and draining the percolation water, and the collected percolation water Discharge after centralized sedimentation treatment to remove pollutants, see figure 2 .

[0032] After leaching, soil samples and soil infiltration water at each monitoring point were collected every 10 days, and the concentration of heavy metals was determined by inductively coupled plasma atomic emission spectrometer (ICP).

[0033] The measurement results are: 1#, 2#, 3# and 4# monitoring points soil heavy metal content basically unchanged, the concentrations of Cu, Pb, Zn and Cd are all around 80.0, 326.0, 278.0 and 0.7ppm. The concentrations of Cu, Pb, Zn and Cd in the underground leachate after precipitation treatment were all lower than 1.0, 2.0, 0.1 and 0.01ppm (see Table 1), indi...

Embodiment 3

[0037] The difference from Example 1 is that in order to improve the treatment effect, 3% lime, a pollutant fixing agent, can be added to the encapsulated and sealed subsurface contaminated soil.

[0038] The monitoring results show that the heavy metal-contaminated soil will not pollute the groundwater and the surrounding environment after continuous leaching treatment after encapsulation, restoration and treatment.

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Abstract

The invention relates to a treatment method for polluted soil, in particular to a treatment method for heavy metal polluted soil. It includes sealing and isolation of subsurface contaminated soil, replacement of surface soil, collection of leachate from contaminated soil, and surface water collection and drainage of clean surface soil. The invention is suitable for treating various complex heavy metal-contaminated soils, can prevent the treated soil from causing secondary pollution to the surrounding environment and groundwater, reduce the ecological risk after soil restoration, and realize the safe utilization of land.

Description

technical field [0001] The invention relates to a treatment method for polluted soil, in particular to a treatment method for heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution is universal, irreversible and superficial, and heavy metal pollutants are complex. It has become a common environmental problem and has attracted more and more attention. The heavy metal elements in the soil do not undergo the process of microbial or chemical degradation, and the heavy metal elements remaining in the soil will seep into the groundwater or further pollute the environment through other means. [0003] The usual solutions are two forms of ex-situ remediation and in-situ remediation. Ex-situ remediation is to excavate the contaminated soil and then treat it with chemical, physical and biological treatment methods, because it involves excavation and transportation. Soil, the treatment cost is high, and it is difficult to control the deep pollution, especi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 李凤梅郭书海徐晟徽李刚冷延慧
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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