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Method for degrading lindanee in different types of soil by using additive in cooperation with mechanochemical method

A technology of synergistic machinery and additives, applied in the field of lindane-contaminated soil remediation, can solve problems such as not much, achieve the effects of less dosage, prolonging the ball milling time, and fast degradation speed

Pending Publication Date: 2021-12-21
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the elimination of persistent organic pollutants, the mechanochemical method has shown advantages such as simple operation process, mild reaction conditions, good treatment effect, and less likely to produce secondary pollution. not much research

Method used

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  • Method for degrading lindanee in different types of soil by using additive in cooperation with mechanochemical method
  • Method for degrading lindanee in different types of soil by using additive in cooperation with mechanochemical method
  • Method for degrading lindanee in different types of soil by using additive in cooperation with mechanochemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Degradation effect of different additives and mechanochemical method on lindane in Jilin black soil

[0038] The selected additives include NaOH, CaO, Al 2 o 3 、Na 2 S 2 o 8 and Fe powder. Accurately weigh 30.0g of lindane polluted Jilin black soil (lindane concentration in the soil is about 100mg / kg), 0.900 / 2.700g (material ratio is 3% / 9%) additive, 309.0 / 327.0g grinding balls are added to the ball milling tank, set In the ball mill, set the speed of the ball mill tank to 500r / min, run in a horizontal planetary mode, change the direction of rotation after every 10 minutes of running for 1 minute, and take 0.05g of soil after ball milling for 10, 20, 30, 60, 120 and 240 minutes respectively , for the determination of lindane content in soil.

[0039] figure 1In this paper, the effects of different additives on the degradation of lindane in Jilin black soil were compared. The experimental results showed that when 3% NaOH was added, the degradation rate of lindane ...

Embodiment 2

[0041] Degradation Effect of Lindane in Four Kinds of Soils Using NaOH as Additive Synergistically with Mechanochemical Method

[0042] Accurately weigh 30.0 g of Henan brown soil, Jiangxi red soil, Jilin black soil, Shanxi cinnamon soil, and Lindane-contaminated Shanxi cinnamon soil with a concentration of about 500 mg / kg in a ball mill, and then add Put 0.900g of NaOH and 309.0g of balls in the ball mill, set the speed of the ball mill to 500r / min, run in a horizontal planetary mode, change the direction and rotate after every 10 minutes of running, and take 10, 20, 30, 0.05g of soil after 60, 120 and 240min is used to determine the lindane content in the soil.

[0043] Such as figure 2 It is shown that using NaOH as an additive can quickly realize the efficient degradation of lindane in various soils. After ball milling for 10 minutes, the degradation rate of lindane in Henan brown soil reached 94.6%, and the content of lindane in brown soil decreased from the original ab...

Embodiment 3

[0046] Degradation effect of lindane in four kinds of soils with CaO as additive and mechanochemical method

[0047] Accurately weigh 30.0g of lindane-contaminated soil with a concentration of about 100mg / kg, 318.0 / 327.0g of grinding balls, and 1.800 / 2.700g of additives in a ball mill, and put them into the ball mill. Set the speed of the ball mill to 500r / min. Run in planetary mode, change direction and rotate after every 10 minutes of running, stay for 1 minute, and take 0.05 g of soil after ball milling for 10, 20, 30, 60, 120 and 240 minutes, respectively, to determine the content of lindane in the soil.

[0048] Depend on Figure 4 It can be seen that using CaO as an additive can also achieve efficient degradation of lindane in various types of soils: the degradation rate of lindane in brown soil after adding 9% CaO for 240 min after ball milling is 93.2%; adding 9% CaO after ball milling for 60 min The degradation rate of lindane in black soil reached 98.3%; for Jiangxi...

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Abstract

The invention discloses a method for degrading lindane in different types of soils by using an additive in cooperation with a mechanochemical method, aiming at degradation of lindane in different typical soils, wherein a horizontal planetary ball milling mode is adopted at normal temperature and normal pressure, proper additives and ball milling conditions are selected, efficient degradation of lindane in different types of soils can be realized, the ball-to-material ratio is 10: 1, the material ratio is 3%-9%, and the rotating speed of the ball milling tank is 500r / min. Results show that after only 3% of NaOH is added and ball milling is carried out for 10 min, the degradation rate of lindane in four kinds of soil reaches up to 95% or above, and the content of lindane in the soil is reduced from 100 mg / kg to 5 mg / kg or below; CaO is used as an additive, so that efficient degradation of lindane in four kinds of soil can also be realized. The method is simple and safe to operate, common and practical in additive, rapid and efficient in lindane degradation and suitable for mechanochemical remediation of lindane-polluted soil in different regions, and has a good practical application prospect.

Description

technical field [0001] The invention belongs to the application field of lindane-contaminated soil remediation, and specifically relates to a method for degrading lindane in different types of soils by means of an additive cooperative mechanochemical method Background technique [0002] Hexachlorocyclohexane is commonly known as HCH, and there are 8 isomers, among which γ-HCH is the most insecticidal and toxic, also known as Lindane. As a broad-spectrum organochlorine insecticide, Lindane was produced and used in large quantities in my country. It is estimated that 4.46-4.9 million tons were imposed in my country during 1947-1997; and the yield of lindane is low, and 8-12 tons of waste or residue will be generated for every 1 ton of lindane produced. Lindane is very stable in the natural environment. Studies have shown that the degradation half-life of Lindane in different soils can reach 100-1000 days. In addition, the long-term and high-intensity use of lindane leads to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B02C17/10
CPCB09C1/08B02C17/10
Inventor 张振国刘希涛徐恒蒲
Owner BEIJING NORMAL UNIVERSITY
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