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Arsenic Contaminated Soil Remediation Agent and Its Application

A soil remediation agent and arsenic-contaminated technology, which is applied in the field of remediation, especially in the field of arsenic-contaminated soil, can solve the problems of poor economy and high cost, and achieve the effects of reducing migration, enhancing stability, and reducing the toxicity of arsenic

Active Publication Date: 2020-04-07
甘肃天农一禾农业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patented method has a higher cost and poor economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Soil restoration of a site in Qinghai. The soil samples were sampled, and the pH value and sulfuric acid nitric acid method (HJ / T 299-2007) leaching arsenic toxicity were tested and analyzed by glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014). The test results showed that the pH value of the soil was 10.24, and the leached arsenic concentration was 24.3mg / L. Take 500g of arsenic-contaminated soil, add 10g of hectorite, and mix and maintain for 2 days. Then add 7.5g of thionyl chloride and 150ml of tap water; mix well, and maintain for 1d for stabilization reaction. Finally, 5g of bentonite was added to the stabilized soil, stirred and mixed, and maintained for 2 days. The remediation soil was tested, and the test results were: pH 7.79, and the concentration of arsenic leached by the sulfuric acid and nitric acid method was 0.032mg / L, which was lower than the Class VI water quality standard of the "Surface Water Environmental Quali...

Embodiment 2

[0031] Soil restoration around Qinghai metallurgical waste slag. The soil around the slag was sampled, and the pH value and arsenic toxicity of sulfuric acid and nitric acid leaching (HJ / T 299-2007) were tested and analyzed by glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014) . The test results showed that the pH of the soil was 8.76, and the leached arsenic concentration was 18.3mg / L. Take 500g of arsenic-contaminated soil, add 5g of hectorite; 8.5g of thionyl chloride, 150ml of tap water; mix well, and maintain for 1d for stabilization reaction. Then add 1.5g of biomass power plant ash and 2.5g of bentonite to the stabilized soil, stir and mix well, and maintain for 2 days. The remediation soil was tested, and the test results were: pH 7.73, and the concentration of arsenic leached by the sulfuric acid and nitric acid method was 0.012mg / L, which was lower than the Class VI water quality standard of the Environmental Quality Standards fo...

Embodiment 3

[0033] Gansu site soil remediation. The soil was sampled, and the pH value and arsenic toxicity of sulfuric acid nitric acid leaching (HJ / T 299-2007) were tested and analyzed by glass electrode method (NY / T 1121.2-2006) and atomic fluorescence method (HJ 702-2014). The results showed that the pH of the soil was 9.74, and the leached arsenic concentration was 15.9mg / L. Take 500g of arsenic-contaminated soil, add 7.5g of hectorite, and mix and maintain for 2 days. Add 6g of thionyl chloride and 150ml of tap water; mix well, and maintain for 1d for stabilization reaction. Then add 2.5g of attapulgite to the stabilized soil, stir and mix well, and maintain for 3 days. The remediation soil was tested, and the test results were: pH 7.61, and the concentration of arsenic leached by sulfuric acid and nitric acid method was 0.036mg / L, which was lower than the Class VI water quality standard of "Surface Water Environmental Quality Standard" (GB3838-2002). The curing rate of the agent...

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Abstract

The invention discloses a remediation agent of arsenic-contaminated soil and the application of the remediation agent of the arsenic-contaminated soil. According to the raw material formula, the remediation agent of the arsenic-contaminated soil comprises hectorite, a sulfur-containing organic compound and a fixing agent. The fixing agent is one or a mixture of multiple ones selected from biomass power plant ash, vermiculite, attapulgite and bentonite. The application method of the remediation agent of the arsenic-contaminated soil comprises the steps that (1) the hectorite is added to the arsenic-contaminated soil, the pH of the arsenic-contaminated soil is adjusted to 6-9, and maintenance is conducted; (2) the sulfur-containing organic compound is added to the arsenic-contaminated soil with the pH being adjusted, and water is added at the same time to enable the soil to be maintained under the set moisture content condition; and (3) the fixing agent is added to the arsenic-contaminated soil processed in the step (2), and maintenance is conducted. The remediation agent of the arsenic-contaminated soil and the application of the remediation agent of the arsenic-contaminated soil have quite high economic value and environment-friendly value, an excellent remediation effect can be obtained, and meanwhile cost can be effectively reduced.

Description

technical field [0001] The invention relates to a remediation agent especially for the remediation of arsenic-contaminated soil and a method for remediating especially arsenic-contaminated soil by using the arsenic-contaminated soil remediation agent. Background technique [0002] Arsenic is a silver-gray semi-metal, and it mainly exists as arsenic compounds in nature. Arsenic compounds have different toxicity due to their different forms and valence states. Common arsenic compounds include arsenic trichloride, arsenic trioxide, arsenic pentoxide, arsenic acid, and calcium arsenate. [0003] In the process of life and production, due to the extensive use of arsenic-containing compounds, the mining and smelting of arsenic ores, the unreasonable discharge of mining wastewater, and the accumulation of arsenic-containing waste slag, the soil is polluted by arsenic to varying degrees. Soil arsenic pollution can endanger human survival and health through water and plant enrichme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C2101/00
Inventor 赵粉红谢爱军高素萍
Owner 甘肃天农一禾农业有限公司