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Method for treating high-concentration organic composite polluted soil by iron-zinc bimetallic mechanochemical ball milling

A mechanochemical and complex pollution technology, applied in the restoration of polluted soil, etc., can solve the problems of high price of precious metals, soil metal pollution, etc., and achieve good degradation effect, simple operation, and mild operation process

Active Publication Date: 2015-12-09
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous studies have shown that only nano-iron powders can exhibit high-efficiency degradation effects. At the same time, the commonly used bimetallic systems contain noble metals (such as palladium, Pd). Although they have strong degradation properties, the price of noble metals is high. Practical application in soil treatment or remediation has limitations
In addition, the addition of metals such as Pd may bring new soil metal pollution problems

Method used

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  • Method for treating high-concentration organic composite polluted soil by iron-zinc bimetallic mechanochemical ball milling
  • Method for treating high-concentration organic composite polluted soil by iron-zinc bimetallic mechanochemical ball milling
  • Method for treating high-concentration organic composite polluted soil by iron-zinc bimetallic mechanochemical ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put the mass ratio of soil: iron powder = 2:1, ball material mass ratio (ball weight: soil + iron powder) = 28:1 soil and additives into the ball mill, and then add stainless steel balls to the ball mill, ball mill and The grinding balls are made of stainless steel. Among them, there are 10 large balls (diameter 19.5mm), 14 medium balls (diameter 9.5mm), and 20 small balls (diameter 8.5mm). The inner diameter of the ball mill jar is 75mm and the height is 71mm. Set the rotating speed to 500rpm, and the ball milling time is set to run for 15 minutes, stop for 15 minutes, then reverse for 15 minutes, stop for 15 minutes, and then cycle in turn. Samples were taken at the set ball milling time, and the residual concentration in the soil samples was analyzed by GC-ECD.

[0025] Put the mass ratio of soil: (iron powder + zinc powder) = 2:1, ball mass ratio (ball weight: soil + iron powder + zinc powder) = 28:1 soil and additives into the ball mill tank, according to the same...

Embodiment 2

[0029] Add the soil and additives with a mass ratio of soil: silicon dioxide = 2:1, a mass ratio of ball to material (ball weight: soil + silicon dioxide) = 28:1, and add stainless steel balls to the ball mill tank, and then ball mill Both the tank and the balls are made of stainless steel. Among them, there are 10 large balls (diameter 19.5mm), 14 medium balls (diameter 9.5mm), and 20 small balls (diameter 8.5mm). The inner diameter of the ball mill jar is 75mm and the height is 71mm. Set the rotating speed to 500rpm, and the ball milling time is set to run for 15 minutes, stop for 15 minutes, then reverse for 15 minutes, stop for 15 minutes, and then cycle in turn. Samples were taken after ball milling for 4 hours, and the residual concentration in the soil samples was analyzed by GC-ECD.

[0030] Add the soil and additives with a mass ratio of soil: aluminum oxide = 2:1, ball mass ratio (ball weight: soil + aluminum oxide) = 28:1, and add the soil and additives to the ball...

Embodiment 3

[0035] Put the mass ratio of soil: iron powder = 2:1, ball material mass ratio (ball weight: soil + iron powder) = 28:1 soil and additives into the ball mill, and then add stainless steel balls to the ball mill, ball mill and The grinding balls are made of stainless steel. Among them, there are 10 large balls (diameter 19.5mm), 14 medium balls (diameter 9.5mm), and 20 small balls (diameter 8.5mm). The inner diameter of the ball mill jar is 75mm and the height is 71mm. Set the rotating speed to 500rpm, and the ball milling time is set to run for 15 minutes, stop for 15 minutes, then reverse for 15 minutes, stop for 15 minutes, and then cycle in turn. Samples were taken at the set ball milling time of 4 hours, and the residual concentration in the soil samples was analyzed by GC-ECD.

[0036] Put the mass ratio of soil: (iron powder + zinc powder) = 2:1, ball mass ratio (ball weight: soil + iron powder + zinc powder) = 28:1 soil and additives into the ball mill tank, according ...

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Abstract

The invention discloses a method for processing high-concentration organic compound polluted soil by adopting iron-zinc bimetallic mechanochemical ball milling. The method comprises the following steps: preparing and weighing soil, namely naturally drying the soil in the air and then removing impurities in the soil; preparing a ball milling reagent, namely enabling a mass ratio of iron powder and zinc powder to be (1:1)-(5:1), and enabling a ratio of the mass of the soil to the total mass of the iron powder and the zinc powder to be (2:1)-(10:1); adding the weighed ball milling reagent into a ball milling tank which is filled with the soil according to a weight ratio of a ball and a material of (7:1)-(28:1), enabling the weight of the material to be the weight sum of the soil and the ball milling reagent, and then covering a cover of the ball milling tank; carrying out ball milling reaction under the conditions with rotation speed of the ball milling tank being 400-500rpm, reaction time being 2-8 hours, reaction temperature being the room temperature and reaction atmosphere being an air atmosphere. By directly adopting low-cost iron powder as an additive to carry out ball milling treatment on the polluted soil with high concentration of DDTs (Dichloro Diphenyl Trichloroethane), a degradation rate greater than 99% can be achieved after reacting for four hours.

Description

technical field [0001] The invention relates to the harmless treatment of high-concentration organic composite polluted soil in pesticide and chemical pollution sites. The main pollutant is DDT and its derivatives (DDTs). The treatment method is a mechanochemical method, and specifically relates to an iron-zinc bimetal system Ball milling is a method for treating high concentration DDTs polluted soil. Background technique [0002] DDT (DDT), as an excellent insecticide, has been widely produced and used around the world since the 1940s. In the 1960s, scientists discovered that DDT is very difficult to decompose in the environment, and can accumulate in animal fat, affecting the survival and reproduction of fish and birds, and disrupting the ecological balance. After the 1970s, many countries banned or restricted the production and use of DDT. DDT is one of the first POPs included in the global control list of the Stockholm Convention on Persistent Organic Pollutants (POPs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 宋静隋红吴鹏余海波黄玉娟
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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