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Restoration method for chromium-contaminated soil

A technology for chromium-contaminated soil and remediation methods, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve problems such as low adsorption capacity, wide application limitations, slow adsorption speed, etc., to achieve reduced content and simple remediation methods , The effect of repairing heavy metal pollution in soil

Inactive Publication Date: 2016-09-21
MAANSHAN ZHONGCHUANG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used adsorption materials are activated carbon, activated alumina and ion exchange resin, etc., although they can effectively adsorb various pollutants, but due to their low adsorption capacity, slow adsorption speed and poor mechanical stability etc., making its wide application limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for repairing chromium-contaminated soil. Take 10g of polyacrylonitrile fiber, slowly add it to 150ml of glycerin and stir evenly, then add 50g of aminopyridine, reflux for 8 hours, filter, and fully wash with tap water until the eluent is close to neutral after drying;

[0020] Take the product after the above reaction, add it to 200ml ethylene glycol, 45ml 1,2-dichloroethane, stir at room temperature for 10 minutes, then add diethanolamine, react at 50°C for 6 hours, remove the solvent after the end, and successively add water, 2% hydrochloric acid Wash the product, and finally wash it with water until neutral to obtain an ion exchange fiber;

[0021] The ion-exchange fiber prepared above is spherical in shape with a diameter of 0.5-1.0 cm. The ion-exchange fiber is rolled and cut into a brick shape of 20 cm*10 cm*5 cm, and buried in chromium-contaminated soil to a depth of 40 cm;

[0022] Since the ion exchange fiber has thousands of times stronger adsorpti...

Embodiment 2

[0024] Take 10g of polyacrylonitrile fiber, slowly add it to 150ml of triethylene glycol and stir evenly, then add 50g of diethylenetriamine, reflux for 8 hours, filter, wash fully with tap water until the eluent is close to neutral, and then dry it;

[0025] Take the product after the above reaction, add it to 200ml of ethylene glycol and 45ml of tetrachloromethane, stir at room temperature for 10min, then add ethylenediamine, react at 50°C for 8h, remove the solvent after the end, wash the product with water and 3% hydrochloric acid in sequence, and finally Wash with water to neutrality to obtain the product;

[0026] Put the ion fiber into a 30-mesh nylon mesh bag or a stainless steel mesh bag, bury it in chromium-contaminated soil at a depth of 35cm, and remove the ion-exchange fiber adsorbed and chelated with chromium metal from the soil.

Embodiment 3

[0028] Take 10g of polyacrylonitrile fiber, slowly add it into 160ml of triethylene glycol and stir evenly, then add 60g of aminopyridine, reflux for 8 hours, filter, wash fully with tap water until the eluent is close to neutral, and then dry it;

[0029] Take the product after the above reaction, add it to 150ml of glycerol, 45ml of 1,2-dichloroethane, stir at room temperature for 10min, then add diethylenetriamine, react at 60°C for 8h, remove the solvent after the end, and use water, 3 % hydrochloric acid to wash the product, and finally wash with water to neutrality to obtain the product;

[0030] Roll and cut the ionic fibers into strips 2 of 100cm*10cm*5cm, and bury them in chromium-contaminated soil to a depth of 52cm.

[0031] The ion-exchange fiber of the present invention uses synthetic fiber as a matrix, and after being modified by chemical treatment methods such as polyamination and phosphorylation, it can be applied to the treatment of soil chromium heavy metal p...

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PUM

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Abstract

The invention discloses a restoration method for chromium-contaminated soil. The restoration method comprises the following steps: taking a proper amount of fibers, adding the fibers into organic alcohol, adding an amination agent, performing refluxing reaction under a stirring state, washing products with water, airing the products, then adding organic alcohol and a chloride-containing solvent, stirring at a room temperature, adding the amination agent for reaction, removing the solvent after reaction is finished, and sequentially washing products with water and hydrochloric acid until the products are neutral, thereby obtaining ion-exchange fibers; performing rolling molding on the ion-exchange fibers or feeding the ion-exchange fibers into a mesh bag, burying the ion-exchange fibers into the chromium-contaminated soil, and removing the ion-exchange fiber ion-exchange fibers from the soil after adsorbing and exchanging, thereby removing chromium-contaminated heavy metals in the soil. The restoration method is simple and rapid, and is applicable to industrial production; by virtue of adsorption and exchange, the heavy metals in the soil can permanently removed, so that the purpose of restoring the heavy metal pollution of the soil is achieved.

Description

technical field [0001] The invention relates to a method for repairing chromium-contaminated soil, in particular to the preparation of an ion-exchange fiber, which is suitable for repairing chromium-contaminated soil. 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/20B01J39/20
CPCC09K17/20B01J39/20
Inventor 朱小平卢珊珊周钰明李健强金凤李杰邓炳波吴云陈婉芳
Owner MAANSHAN ZHONGCHUANG ENVIRONMENTAL PROTECTION TECH CO LTD
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