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Repair method of arsenic-polluted soil

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

Active Publication Date: 2016-03-23
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, pick out gravel and plant residue, grind it through a 100-mesh sieve, mix well, and set aside. Manganese dioxide and iron powder are ground through a 100-mesh sieve and set aside. Add citric acid solution (concentration: 0.01mol L -1 , The liquid-to-soil ratio is 1.5mL·g -1 ), stirred evenly, and reacted for 2 hours; added 5g of manganese dioxide, stirred evenly, and reacted for 12h; added 30g of iron powder, stirred evenly, and reacted for 2 days; Natural cultivation for 4 days. Do leaching toxicity test on stabilized soil, leaching method "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the stabilization efficiency of arsenic in soil is 95.39%, and the leaching concentration of arsenic is 0.96mg · L -1 .

Embodiment 2

[0028] The arsenic content of the tested polluted soil was 3779mg·kg -1 , leaching concentration 45.85mg·L -1 . Take 500g of arsenic-contaminated soil, air-dry it naturally, pick out gravel and plant residues, grind it through a 100-mesh sieve, and mix it thoroughly for use. Manganese dioxide and ferroferric oxide were ground through a 100-mesh sieve for use. Sodium hydroxide solution (concentration of 0.5 mol L -1 , the liquid-to-soil ratio is 2mL·g -1 ), activated for 3 hours, added 15g of manganese dioxide, stirred evenly, and reacted for 4h; added 150g of ferric oxide, stirred evenly, and stabilized for 3 days; Cultured for 5 days. Do leaching toxicity test 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 is 85.23%, and the leaching concentration of arsenic is 6.77mg · L -1 .

Embodiment 3

[0030] The arsenic content of the tested polluted soil was 503mg·kg -1 , leaching concentration 6.85mg·L -1 . Take 500g of arsenic-contaminated soil, air-dry it naturally, pick out gravel and plant residue, grind it through a 100-mesh sieve, mix well, and set aside. Manganese dioxide and ferric oxide were ground through a 100-mesh sieve for use. Potassium phosphate solution (concentration of 0.3 mol L -1 , the liquid-to-soil ratio is 1mL·g -1 ), activated for 6 hours, added 2.5 g of manganese dioxide, stirred evenly, and reacted for 6 hours; added 25 g of ferric oxide, stirred evenly, and stabilized for 1 day. Add 10 g of plant ash, adjust the soil moisture content to 20%-30%, stir evenly, and cultivate naturally for 3 days. Do leaching toxicity test on 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 is 93.86%, and the leaching concentr...

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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 in particular relates to a method for repairing arsenic-contaminated soil. Background technique [0002] According to statistics, about 20 million hectares of cultivated land in my country are polluted by heavy metals such as chromium, lead, cadmium and arsenic, accounting for about 20% of the total cultivated land area. Arsenic (As), as one of the "five poisonous elements" (arsenic, lead, chromium, cadmium, mercury), has received much social attention due to its strong toxicity and great harm to the environment and human body. According to reports, at least 50 million people around the world are suffering from the threat of endemic arsenic poisoning, mainly in Asian countries, and my country is one of the countries most seriously affected by arsenic poisoning. The amount of arsenic entering the soil through atmospheric deposition in Belgium is 15g·h...

Claims

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Application Information

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Patent Type & Authority Applications(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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