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Heavy metal polluted soil in-situ chromatography governance method

A technology for polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of engineering pollution, few successful cases, and high engineering cost, and achieve the effect of reducing the enrichment concentration

Active Publication Date: 2015-08-05
北京泰克美高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] As a whole, soil pollution remediation still faces many challenges, among which remediation technology, equipment, remediation materials, remediation agent research and development reserves and mechanism research are insufficient, there are few successful cases, engineering pollution is common, and engineering costs are high. Prominent problems such as fuzzy engineering results
In particular, the hidden danger of secondary pollution caused by the extensive use of chemical agents and the change of the state of heavy metals in the restoration project is extremely great.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0060] Soil samples were selected from polluted soil in a plot in the suburbs of Beijing, dried and ground, and passed through a 20-mesh nylon sieve. The basic physical and chemical properties of the soil are pH 7.78, organic matter content 16.1g kg -1 , cation exchange capacity 12.2cmol kg -1 , clay mass fraction 20.2wt%, silt mass fraction 34.1wt%, sand mass fraction 45.7wt%.

[0061] A 150cm deep vertical pit was dug in the actual site, and 2.5L soil samples were taken every 10cm height, and a total of 10 soil samples were taken from the soil surface to 100cm deep. A plexiglass column with a diameter of 10cm, a height of 150cm, and multiple drainage holes at the lower end is selected as the simulated soil layer device. According to the soil depth distribution of the actual site, it is filled into the glass column, and a total of two filled columns are prepared, which are marked as column 1 and column 2.

[0062] After adding about 3000ml of pure water to the column 1 to ...

Embodiment 2

[0068] Soil samples were selected from polluted soil in a plot in Shenyang, dried and ground, and passed through a 20-mesh nylon sieve. The basic physical and chemical properties of the soil are pH 7.74, organic matter content 35.5g·kg -1 , cation exchange capacity 10.9cmol·kg -1 , clay mass fraction 19.2wt%, silt mass fraction 18.8wt%, sand mass fraction 62.0wt%.

[0069] A 150cm deep vertical pit was dug in the actual site, and 2.5L soil samples were taken every 10cm height, and a total of 10 soil samples were taken from the soil surface to 100cm deep. A plexiglass column with a diameter of 10cm, a height of 150cm, and multiple drainage holes at the lower end is selected as the simulated soil layer device. According to the soil depth distribution of the actual site, it is filled into the glass column, and a total of two filled columns are prepared, which are marked as column 1 and column 2.

[0070] After adding about 3000ml of pure water to the column 1 to moisten and le...

Embodiment 3

[0076] The polluted site is selected from a plot in Zhuzhou, with a total area of ​​660m 2 , the site contains a natural water barrier two meters below the ground. The basic physical and chemical properties of the soil are pH 6.12, organic matter content 11.4g kg -1 , cation exchange capacity 10.4cmol kg -1 , clay mass fraction 14.4wt%, silt mass fraction 42.7wt%, sand mass fraction 42.9wt%.

[0077] Blank sampling: divide the experimental soil into four layers in depth according to 0-20cm, 20-50cm, 50-80cm and 80-100cm, and take 350g soil samples from the upper, middle and lower parts of each depth layer, and mix them evenly Determination of Cd in each layer of soil samples by ICP-MS according to the national standard for the determination of heavy metal-contaminated soil 2+ , Pb 2+ and As 5+ This value is used as the soil pollution value before treatment.

[0078] Configure 30 tons of degradable reagent aqueous solution, wherein the mass concentration of tartaric acid ...

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Abstract

The invention belongs to the field of soil repair, and particularly relates to a heavy metal polluted soil in-situ chromatography method. The method comprises the following steps: adding a degradable reagent aqueous solution into a heavy metal polluted soil surface layer on the spot, eluting heavy metal ions in heavy metal polluted soil, and gradually permeating the heavy metal ions downwards, so as to obtain the governed surface soil. According to a positive-phase spectrum principle, the degradable reagent aqueous solution adequately reacts with the polluted soil on the spot, so that the heavy metal ions in the soil and the degradable reagent form a compound, adsorption force between the heavy metal ions and the soil is weakened, and the heavy metal ions are desorbed from the surface soil. The heavy metal ions eluted by the degradable reagent aqueous solution can be permeated into the deep layer of the soil along with the degradable reagent aqueous solution, the degradable reagent aqueous solution comprises degradable components, the degradable aqueous solution is gradually degraded in the soil in the permeation process, and after the degradable reagent aqueous solution is degraded, the heavy metal ions are fixed in the deep soil.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to an in-situ chromatographic treatment method for heavy metal polluted soil. Background technique [0002] Soil is the basic environmental element that constitutes the ecosystem, the material basis for human survival, and an important resource that is indispensable for economic and social development. [0003] Soil pollution means that industrial and urban waste, chemical fertilizers, pesticides, heavy metals, radioactive substances and harmful microorganisms enter the soil through various channels, exceeding the self-purification capacity of the soil, causing changes in the composition, structure and function of the soil, inhibiting microbial activities, and causing soil pollution. The ecological balance is destroyed, the soil quality declines, and the normal development of crops and product quality are affected. [0004] According to the 2014 "National Soil Pollution ...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 王兵郑玉静陈尚义吕伟青戴学良高鑫磊刘欣怡
Owner 北京泰克美高新技术有限公司