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Biological carbon-plant joint repairing method of chlorobenzene volatile organic compound-contaminated soil

A technology of volatile organic compounds and polluted soil, which is applied in the field of polluted environment remediation, can solve problems such as polluted soil, achieve the effect of improving soil, increasing fertility and reducing exposure risk

Inactive Publication Date: 2015-04-29
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The principle of the present invention: the research idea of ​​"fixation-degradation" two-step method to solve the problem of remediation of soil contaminated by volatile organic pollutants

Method used

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  • Biological carbon-plant joint repairing method of chlorobenzene volatile organic compound-contaminated soil
  • Biological carbon-plant joint repairing method of chlorobenzene volatile organic compound-contaminated soil
  • Biological carbon-plant joint repairing method of chlorobenzene volatile organic compound-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First prepare biochar, cut wheat straw into broken sections and bake at 80℃ for 12h to dry, then transfer to heating furnace for carbonization, initial furnace temperature is 200℃, program temperature rise to 300℃ then 500℃ and keep for 1.5h , After natural cooling, grinding, and passing through a 0.25mm sieve. The prepared biochar was added to 300g of 1,2,4-trichlorobenzene in an amount of 1% and 2% of the dry weight of the soil, and the concentration was 7μg g. -1 In the contaminated soil, stir and mix thoroughly, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3g cm -3 , Sealed with rubber plugs with air inlet and outlet, incubate at 25°C in the dark. The treatment without adding biochar was used as a control. Use airtight traps to ventilate each week of the culture, and use n-hexane to trap the volatilized trichlorobenzene. After 4 weeks of culture, such as figure 1 As shown, the volatilization loss of trich...

Embodiment 2

[0034] According to Example 1, biochar was prepared, and then the biochar was added to 300 g of 1,2,4,5-tetrachlorobenzene in an amount of 1% and 2% of the dry weight of the soil, respectively, with a concentration of 1 μg g -1 In the contaminated soil, stir and mix thoroughly, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3g cm -3 , Seal with rubber plugs with air inlet and outlet, and incubate at 25°C in the dark. The treatment without adding biochar was used as a control. Use airtight traps to ventilate each week of the culture, and use n-hexane to trap the volatilized tetrachlorobenzene. After 4 weeks of culture, such as image 3 As shown, the volatilization loss of tetrachlorobenzene in the treatment with biochar addition was reduced by 81.26% and 85.42%, respectively, compared with the control without addition, which significantly inhibited the volatilization of tetrachlorobenzene from the soil to the atmosphere....

Embodiment 3

[0036] According to Example 1, biochar was prepared, and then the biochar was added to 300g of pentachlorobenzene in an amount of 1% and 2% of the dry weight of the soil to a concentration of 1μg g. -1 In the contaminated soil, stir and mix thoroughly, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3g cm -3 , Seal with rubber plugs with air inlet and outlet, and incubate at 25°C in the dark. The treatment without adding biochar was used as a control. Use airtight traps to ventilate each week of the culture, and use n-hexane to trap the volatilized pentachlorobenzene. After 4 weeks of culture, such as Figure 5 As shown, the volatilization loss of pentachlorobenzene in the treatment with biochar addition was reduced by 78.57% and 84.43%, respectively, compared with the control without addition, which significantly inhibited the volatilization of pentachlorobenzene from the soil to the atmosphere. Immediately after the a...

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Abstract

The invention discloses a biological carbon-plant joint repairing method of chlorobenzene volatile organic compound-contaminated soil, and belongs to the field of contaminated soil repairing. The method comprises the following steps: (1) adding biological carbon to chlorobenzene-contaminated soil at the mass ratio of 1%-2%, adjusting the moisture content of the soil to be 28%, and ageing for four weeks; and (2) planting ryegrass into soil to which the biological carbon is added, wherein the density is 1,000-2,000 per square meter; growing for 90 days and cutting off the over-ground part. According to the biological carbon-plant joint repairing method, volatilization of volatile organic compounds from soil to atmosphere can be effectively reduced; the risk that the volatile organic compounds enter a food chain along with food is reduced; the human exposure risk is reduced; pollutants can be thoroughly degraded; and the method is simple and convenient o operate, environment-friendly, safe, high in efficiency, and suitable for repairing of large-area volatile organic compound-contaminated soil.

Description

Technical field [0001] The invention relates to the technical field of remediation of polluted environments, and more specifically, to a biochar-plant joint remediation method for soil contaminated by chlorobenzene volatile organic compounds. Background technique [0002] Over the years, due to the discharge of industrial and agricultural pollutants, soil pollution has become a global environmental and social issue of great concern to the public. The pollution of persistent organic pollutants (POPs) in soil has become a typical environmental problem in my country and restricts the economic and social development of China. Due to the toxicity, persistence, bioaccumulation and long-distance migration of POPs (Zhu et al., 2005), soil POPs pollution not only affects the quality of agricultural products, but also threatens human health through the food chain. Therefore, remediation of POPs-contaminated soil has become an important strategic guide for solving my country's current envi...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 宋洋李洋王芳卞永荣蒋新杨兴伦谷成刚叶茂
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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