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Method for fixing chlorobenzene volatile organic pollutants by straw biomass charcoal

A volatile organic, biomass carbon technology

Inactive Publication Date: 2013-04-24
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The adsorption of organic pollutants such as polycyclic aromatic hydrocarbons and herbicides by biochar has been reported [Chun, Y., Sheng, G.Y., Chiou, C.T., Xing, B.S. Compositions and sorbtive properties of crop residue-derived chars. Environmental Science & Technology, 2004, 38(17): 4649-4655; Yang, Y.N., Sheng, G.Y. Enhanced pesticide adsorption by soils containing particulate matter from crop residue burns. Environmental Science & Technology, 2003a, 37(16): 3635 ], but the use of biochar to immobilize and remediate volatile organic pollutants in soil has not been reported

Method used

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  • Method for fixing chlorobenzene volatile organic pollutants by straw biomass charcoal
  • Method for fixing chlorobenzene volatile organic pollutants by straw biomass charcoal
  • Method for fixing chlorobenzene volatile organic pollutants by straw biomass charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Biochar, activated carbon, and clay minerals were added to 300 g of 1,2,4-trichlorobenzene in an amount of 1% of the dry weight of the soil. The concentration was 7 μg g ?1 In the contaminated soil, stir and mix well, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3 g cm ?3 , sealed with a rubber stopper with an air inlet and an air outlet, and incubated at 25°C in the dark. The treatment without adding any material was used as the control. At the 1st, 2nd, 4th, 8th, 12th, and 24th weeks of culture, airtight trapping devices were used to ventilate. After the aeration was over, the soil was collected, and the total amount of chlorobenzene was extracted and analyzed by n-hexane-accelerated solvent extraction, and extracted by butanol. Bioavailability of chlorobenzenes in soil.

[0033] Such as figure 1 As shown, there was no significant difference in the residual dynamics of trichlorobenzene in the addition ...

Embodiment 2

[0036] Biochar was added to 300 g of PeCB at an addition rate of 0.1% of the dry weight of the soil at a concentration of 1 μg g ?1 In the contaminated soil, stir and mix well, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3 g cm ?3 , sealed with a rubber stopper with an air inlet and an air outlet, and incubated at 25°C in the dark. 0.5%wt, 1%wt and 2%wt of biochar were added in the same treatment as above, and the treatment without adding biochar was used as the control (0%wt). At the 1st, 2nd, 4th, 8th, 12th, and 24th weeks of culture, airtight trapping devices were used to ventilate. After the aeration was over, the soil was collected, and the total amount of chlorobenzene was extracted and analyzed by n-hexane-accelerated solvent extraction, and extracted by butanol. Bioavailability of chlorobenzenes in soil.

[0037] Such as Figure 4 It was shown that after the addition of biochar, the residual concentrati...

Embodiment 3

[0040] Biochar was added to 300 g of 1,2,4,5-tetrachlorobenzene at an addition rate of 0.1% of the dry weight of the soil at a concentration of 0.9 μg g ?1 In the contaminated soil, stir and mix well, then transfer to a 1-L jar, adjust the soil moisture content to 28%, and compact the soil to a density of 1.3 g cm ?3 , sealed with a rubber stopper with an air inlet and an air outlet, and incubated at 25°C in the dark. 0.5%wt, 1%wt and 2%wt of biochar were added in the same treatment as above, and the treatment without adding biochar was used as the control (0%wt). At the 1st, 2nd, 4th, 8th, 12th, and 24th weeks of culture, airtight trapping devices were used to ventilate. After the aeration was over, the soil was collected, and the total amount of chlorobenzene was extracted and analyzed by n-hexane-accelerated solvent extraction, and extracted by butanol. Bioavailability of chlorobenzenes in soil.

[0041] Such as Figure 7 It was shown that after the addition of biochar, ...

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Abstract

A method for fixing chlorobenzene volatile organic pollutants by straw biomass charcoal comprises the following steps: shearing straws into fragmentations, drying the fragmentations at the temperature of 80 DEG C, then, transferring the fragmentations to a retort for charing, wherein the initial retort temperature is 200 DEG C, and the retort temperature is increased to 30 DEG C and then to 500 DEG C through temperature programming, lasting for 1.5 hours, naturally cooling and then grinding the fragmentations, screening the fragmentations by a 0.25 mm sieve to obtain biomass charcoal; and enabling the the biomass charcoal to be uniformly mixed with chlorobenzene polluted soil at a ratio of 0.1 to 2 percent of the dry weight of the soil, standing for 4 to 12 weeks, and finishing the fixation. The straws are wheat straws. After biomass charcoal is added in the soil, the volatilization loss of chlorobenzene only accounts for 4.49 to 15.58 percent of that of chlorobenzen when no biomass charcoal is added in the soil, and the bio-concentration of earthworms to chlorobenzene in the soil only accounts for 2.83 to 3.78 percent of that of earthworms to chlorobenzene when no biomass charcoal is added in the soil, so that the environment risk of the volatile pollutants is reduced remarkably. The crop straws resource is rich, is cheap and easily obtained, and the method opens up a novel way for using the straws to restore the polluted soil.

Description

[0001] technical field [0002] The invention belongs to the field of contaminated soil restoration and relates to an application method for fixing chlorobenzene volatile organic pollutants in soil by using straw biomass charcoal. [0003] Background technique [0004] Soil pollution, especially persistent organic pollutant pollution, has become one of the important global environmental problems. Chlorobenzene is a persistent organic pollutant. my country is the main producer and supplier of chlorobenzene products in the world. In some industrial areas, the problem of soil chlorobenzene pollution has become prominent. For example, in a chemical industry area in Beijing, chlorobenzene was detected in both soil and plant media [Zhou Xia, Yu Gang, Huang Jun, Zhang Zulin, Hu Hongying. Residues and distribution of chlorobenzene organic compounds in soil and plants in a chemical industry area in the southeastern suburbs of Beijing Characteristics. Environmental Science, 2007, 28...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 宋洋王芳蒋新谢祖彬谷成刚杨兴伦卞永荣
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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