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Heavy-metal-polluted soil remediating method

A technology of pollution remediation and remediation method, applied in the field of soil remediation, to achieve the effects of reducing mobility and toxicity, simple remediation method, and remediation of heavy metal pollution in soil

Inactive Publication Date: 2016-11-16
安徽金联地矿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the technology of combining exchange fiber and attapulgite materials to repair and treat heavy metals cannot be satisfied in the existing technology. In order to meet the further needs of the existing situation for soil heavy metal restoration, a solution is now provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A soil heavy metal pollution restoration method, the restoration method comprises the following steps:

[0017] (1) Add 4.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.22kg of polyvinyl alcohol fibers in turn, and reflux for 1 hour under stirring to obtain an intermediate product; after the intermediate product is washed with water, add 1.5kg of ethylene glycol, 6.75 Mixed solution of kg aminopyridine and 1.25 kg ethyl chloride, reacted for 30 minutes under stirring at room temperature, after the completion, washed the product with water, hydrochloric acid, and water in sequence to neutrality, and obtained ion-exchange fibers;

[0018] (2) Add the above-mentioned ion-exchange fiber to the attapulgite powder with a particle size of 350mm in a weight ratio of 3:1.2 to obtain a mixture, which is rolled into a block of 1.5m*1.5m*10cm, buried Into the soil polluted by heavy metals at a depth of 25cm, after 30 days of adsorption and exchange, it was removed from th...

Embodiment 2

[0020] (1) Add 4.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.22kg of polyvinyl alcohol fibers in turn, and reflux for 1 hour under stirring to obtain an intermediate product; after the intermediate product is washed with water, add 1.5kg of ethylene glycol, 6.75 Mixed solution of kg aminopyridine and 1.25 kg ethyl chloride, reacted for 30 minutes under stirring at room temperature, after the completion, washed the product with water, hydrochloric acid, and water in sequence to neutrality, and obtained ion-exchange fibers;

[0021] (2) Add the above-mentioned ion-exchange fiber to the attapulgite powder at a weight ratio of 2:1.5 to obtain a mixture, which is rolled into strips of 2m*1m*10cm, and buried in a depth of 15cm for heavy metal pollution In the soil, after 20 days of adsorption and exchange, it was removed from the soil.

Embodiment 3

[0023] (1) Add 3.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.5kg of polyvinyl alcohol fibers in turn, and reflux for 50 minutes under stirring to obtain an intermediate product; after the intermediate product is washed with water, add 1.5kg of ethylene glycol, 6.75 kg of aminopyridine and 1.25 kg of ethyl chloride mixed solution, reacted for 25 minutes under stirring at room temperature, after the end, washed the product with water, hydrochloric acid, and water until neutral, and obtained ion-exchange fibers;

[0024] (2) Add the above-mentioned ion-exchange fiber to the attapulgite powder in a weight ratio of 4:1 to obtain a mixture, which is packed in a 25-mesh nylon mesh bag and buried in a heavy metal-polluted soil with a depth of 35cm , After 60 days of adsorption and exchange, it is removed from the soil.

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Abstract

The invention discloses a heavy-metal-polluted soil remediating method. The remediating method includes the following steps that ethylene glycol and ethylene diamine are sequentially added into a certain quantity of polyvinyl alcohol fibers, and a reflux reaction is conducted in a stirred state to obtain an intermediate product; the intermediate product is washed with water and placed into a mixed solution of ethylene glycol, aminopyridine and chloroethane, stirring is conducted at the normal temperature to conduct a reaction, a product is washed with water, hydrochloric acid and water in sequence to be neutral after the reaction, and ion exchange fibers are obtained; and attapulgite powder is added into the ion exchange fibers according to the weight ratio of (2-4):(1-1.5), a uniform mixture is obtained, the uniform mixture is rolled to be formed or placed in a net bag and then buried in heavy-metal-polluted soil, and the uniform mixture is taken out of the soil after adsorption and exchange. The fibers used as the matrix are compounded with the attapulgite powder, the uniform mixture is applied to treating and remediating heavy-metal-polluted soil, and the remediating method is simple, rapid and suitable of industrial production.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to a method for remediating soil heavy metal pollution. Background technique [0002] At present, the area of ​​heavy metal polluted soil in China is at least 20 million hectares. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, and urban transportation. Vehicle exhaust emissions, improper disposal of electronic waste, etc., will lead to heavy metal pollution in the soil. Soil heavy metal pollution has the characteristics of poor mobility, long residence time, and irreversibility of pollutants in the soil, resulting in decreased soil fertility, reduced crop yield and quality, and polluted groundwater and surface water through runoff and leaching. [0003] Adsorption filtration i...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/00C09K17/40
CPCB09C1/08B09C1/00B09C2101/00C09K17/40
Inventor 秦月琴任飞孙忠伟明桂林吴海东王前张传琦牛杏杏王赞王代飞
Owner 安徽金联地矿科技有限公司
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