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A method for in-situ chromatography treatment of heavy metal contaminated soil

A technology of polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of engineering pollution, few successful cases, insufficient research and development reserves and mechanism research, and achieve the effect of reducing the enrichment concentration

Active Publication Date: 2018-07-06
北京泰克美高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for in-situ chromatography treatment of heavy metal contaminated soil
  • A method for in-situ chromatography treatment of heavy metal contaminated soil
  • A method for in-situ chromatography treatment of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
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

This application belongs to the field of soil remediation, and in particular relates to an in-situ chromatography treatment method for heavy metal contaminated soil. The method provided by this application includes the following steps: adding a degradable reagent aqueous solution to the surface layer of heavy metal-contaminated soil in situ, eluting the heavy metal ions in the heavy metal-contaminated soil and gradually penetrating to obtain treated surface soil. This application is based on the principle of normal phase chromatography, and the aqueous solution of the degradable reagent fully interacts with the contaminated soil in situ, so that the heavy metal ions in the soil and the degradable reagent form a combination, weakening the adsorption force between the heavy metal ions and the soil, and making the heavy metal ions Detachment from surface soil. The heavy metal ions eluted by the degradable reagent aqueous solution penetrate into the deep soil along with the degradable reagent aqueous solution. Since the degradable reagent aqueous solution is a degradable component, it gradually degrades in the soil during the process of combining heavy metals with infiltration. The degradable reagent After degradation in aqueous solutions, heavy metal ions are fixed in deep soil.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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