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A chemical leaching method for heavy metal polluted soil

A technology of polluted soil and chemical leaching, applied in the field of environmental remediation, can solve problems such as unsatisfactory effect of polluted soil remediation, and achieve the effect of improving the removal rate and the removal efficiency.

Active Publication Date: 2022-04-01
南京浦世环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, FeCl is usually used alone 3 , citric acid or EDTA are used as eluents to wash the soil. These leaching methods mainly focus on soil contaminated by one or two or three heavy metals (cadmium, lead, copper, etc.), and arsenic and volatilized arsenic in the form of anions. The remediation effect of contaminated soil with coexistent mercury is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The soil in the warehouse of a nitrogen fertilizer factory in Guangzhou was collected, and its basic physical and chemical properties were measured: arsenic 68.4mg / kg, cadmium 1.56mg / kg, lead 255.6mg / kg, copper 320.0mg / kg, mercury 5.2mg / kg, pH=7.28.

[0026] A chemical washing method for heavy metal contaminated soil, comprising the steps of:

[0027] (1) After air-drying the heavy metal contaminated soil, crush it, then sieve the soil between 60-200 meshes, and mix evenly;

[0028] (2) Weigh 10g of soil into a 250ml Erlenmeyer flask, add 50ml of 0.5mol / L potassium iodide solution, adjust the pH to 4 with 0.1mol / L HCl, shake at room temperature for 60min at a horizontal shaking speed of 200rpm, and centrifuge to remove the Washing solution, to obtain the soil after one leaching;

[0029] (3) Adding 50ml of hydroxylamine hydrochloride solution with a concentration of 0.5mol / L to the soil after the first leaching, adjusting the pH to 1.5, shaking for 60min at room temper...

Embodiment 2

[0043] The soil in the farmland warehouse around a smelter in Guangzhou was collected, and its basic physical and chemical properties were measured: arsenic 23.50mg / kg, cadmium 30.65mg / kg, lead 772mg / kg, copper 222.3mg / kg, mercury 1.74mg / kg, pH=5.75.

[0044] A chemical washing method for heavy metal contaminated soil, comprising the steps of:

[0045] (1) After air-drying the heavy metal contaminated soil, crush it, then sieve the soil between 60-200 meshes, and mix evenly;

[0046] (2) Weigh 10g of soil into a 250ml Erlenmeyer flask, add 50ml of 0.5mol / L potassium iodide solution, adjust the pH to 4 with 0.1mol / L HCl, shake at room temperature for 60min at a horizontal shaking speed of 200rpm, and centrifuge to remove the Washing solution, to obtain the soil after one leaching;

[0047] (3) Adding 50ml of hydroxylamine hydrochloride solution with a concentration of 0.5mol / L to the soil after the first leaching, adjusting the pH to 1.5, shaking for 60min at room temperature ...

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Abstract

The invention relates to a chemical leaching method for heavy metal-contaminated soil. The heavy metal-contaminated soil is air-dried and crushed, the soil between 60-200 meshes is screened, potassium iodide solution is added to the soil, and the pH is adjusted to 3-4.5 and mixed evenly. Centrifuge to remove the eluent, add hydroxylamine hydrochloride solution to the soil after the leaching, adjust the pH to 1-2.5 and mix well, then centrifuge to remove the eluent, add potassium permanganate aqueous solution to the soil after the leaching, adjust pH is 3-4 and mixed well, then centrifuged to remove the eluent, add ferric chloride aqueous solution to the soil after rinsing, adjust the pH to 3-4 and mix well, then centrifuge to remove the eluent, pour into the washed soil Add deionized water to the soil, mix evenly, remove the rinse solution, and obtain the repaired soil. The invention adopts potassium iodide solution, hydroxylamine hydrochloride solution, potassium permanganate aqueous solution and ferric chloride aqueous solution to wash polluted soil step by step, can completely remove heavy metals in soil, and has high restoration efficiency.

Description

technical field [0001] The invention relates to a chemical leaching method for soil polluted by heavy metals, and belongs to the technical field of environmental restoration. Background technique [0002] In recent decades, the process of industrialization and urbanization has been accelerating, and the problem of soil pollution has become increasingly prominent. Chemical plants that were originally located in urban areas or suburbs have been relocated one after another. It is an inevitable trend that their legacy sites be included in urban construction planning. However, industrial production activities have led to the enrichment of high-concentration heavy metals in chemical plant sites, and their diffusion to groundwater and adjacent areas, which is a huge hidden danger to surrounding agricultural production and residents' lives. Heavy metals have the characteristics of long residual time, strong concealment, and high toxicity. They cannot be degraded by microorganisms. O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 刘亚南赵良柏小东
Owner 南京浦世环境科技发展有限公司