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A kind of remediation method of arsenic polluted soil

A remediation method and arsenic pollution technology, applied in the field of arsenic-contaminated soil remediation, can solve problems such as the influence of soil physical and chemical shape, change soil pH, etc., and achieve the effects of preventing soil acidification, improving soil, and improving soil nutrients

Active Publication Date: 2018-05-18
武汉市秀谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method changes the pH of the soil and has a certain impact on the physical and chemical shape of the soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The arsenic content of the contaminated soil tested was 1079 mg·kg -1 , leaching concentration 20.85mg·L -1 . Take 500g of arsenic-contaminated soil, air-dry it naturally, remove gravel and plant residues, grind it through a 100-mesh sieve, mix well, and set aside. The manganese dioxide and iron powder were ground through a 100-mesh sieve and set aside. Add citric acid solution (concentration of 0.01mol·L to arsenic-contaminated soil) -1 , the liquid-soil ratio is 1.5 mL g -1 ), stir evenly, and react for 2 hours; add 5 g of manganese dioxide, stir evenly, and react for 12 hours; add 30 g of iron powder, stir evenly, and react for 2 days; add 15 g of plant ash, adjust the soil moisture content to 20%-30%, stir evenly, Natural culture for 4 days. The leaching toxicity experiment was done on the stabilized soil. The leaching method "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the stabilization efficiency of arsenic ...

Embodiment 2

[0028] The arsenic content of the contaminated soil tested was 3779 mg·kg -1 , leaching concentration 45.85mg·L -1 . Take 500g of arsenic-contaminated soil, air-dry it naturally, remove gravel and plant residues, grind it through a 100-mesh sieve, mix well, and set aside. Manganese dioxide and ferric tetroxide were ground through a 100-mesh sieve and set aside. Add sodium hydroxide solution (concentration is 0.5mol·L to arsenic-contaminated soil) -1 , the liquid-soil ratio is 2mL·g -1 ), activate for 3h, add 15g of manganese dioxide, stir evenly, and react for 4h; add 150g of ferric tetroxide, stir evenly, and stabilize for 3 days; add 5g of plant ash, adjust the soil moisture content to 20%-30%, stir evenly, naturally Cultured for 5 days. The leaching toxicity experiment was carried out on the stabilized soil. The leaching method "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007), the stabilization efficiency of arsenic in th...

Embodiment 3

[0030] The arsenic content of the contaminated soil tested was 503 mg·kg -1 , leaching concentration 6.85mg·L -1 . Take 500g of arsenic-contaminated soil, air-dry it naturally, remove gravel and plant residues, grind it through a 100-mesh sieve, mix well, and set aside. Manganese dioxide and ferric oxide were ground through a 100-mesh sieve and used. Add potassium phosphate solution (concentration is 0.3mol·L to arsenic-contaminated soil) -1 , the liquid-soil ratio is 1 mL g -1 ), activate for 6h, add 2.5g of manganese dioxide, stir evenly, and react for 6h; add 25g of ferric oxide, stir evenly, and stabilize for 1 day. Add 10g of plant ash, adjust the soil moisture content to 20%-30%, stir evenly, and cultivate naturally for 3 days. The leaching toxicity test was carried out on the stabilized soil. The leaching method "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the stabilization efficiency of arsenic in the soil was 93...

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PUM

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Abstract

The invention discloses a repair method of arsenic-polluted soil. The repair method comprises the following steps: 1) activation: an activating agent is added in the arsenic-polluted soil, and is uniformly stirred for reaction; 2) oxidation: manganese dioxide is added in the arsenic-polluted soil activated in the step 1), and is uniformly stirred for oxidation; 3) stabilization: a stabilizing agent is added in the arsenic-polluted soil oxidized in the step 2), and is uniformly stirred for standing; and 4) acid and alkali adjustment: plant ash is added in the arsenic-polluted soil stabilized in the step 3), is uniformly stirred, and is naturally cultivated; and meanwhile, the water content of the soil is adjusted. The repair method combines a leaching technology with a stabilizing technology, and is simple in operation, wide in raw material source and excellent in stabilizing effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection of heavy metal pollution, and particularly relates to a method for restoring arsenic-contaminated soil. Background technique [0002] According to statistics, about 20 million hectares of arable land in my country is polluted by heavy metals such as chromium, lead, cadmium and arsenic, accounting for about 20% of the total arable land. Arsenic (As), as one of the "five poison elements" (arsenic, lead, chromium, cadmium, mercury), has received much attention from the society due to its strong toxicity and great harm to the environment and human body. According to reports, at least 50 million people in the world are suffering from the threat of endemic arsenic poisoning, most of which are Asian countries, and my country is one of the countries most seriously affected by arsenic poisoning. The daily amount of arsenic entering the soil through atmospheric deposition in Belgium is 15 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 莫小荣陈泳达黄远林李素霞唐植成林俊良陈慧蓉
Owner 武汉市秀谷科技有限公司
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