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Arsenic contaminated soil remediation method

A technology for soil remediation and arsenic pollution, applied in the field of soil pollution remediation, can solve the problems of high treatment cost, low remediation efficiency, inability to effectively remove soil heavy metal pollution sources, etc., and achieves the effect of simple preparation method and good treatment effect.

Inactive Publication Date: 2019-02-05
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally problems such as low restoration efficiency, high treatment cost, and inability to effectively remove soil heavy metal pollution sources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Take 1Kg of soil from the arsenic-contaminated plot, and detect that the arsenic content in the soil sample is 92.31mg / kg, and process it into 2-5mm soil particles through a crusher; configure sodium citrate solution, and mix the prepared Add 1mol / L sodium citrate solution to the soil particles and mix and stir for 30 minutes to obtain a mixture of soil and solution; add 3mol / L hydrogen iodide solution to the mixture of soil and solution, stir well, and keep the soil pH=5.5. Arsenate ions or arsenic acid and iodide ions generate elemental iodine and arsenous acid or arsenite under acidic conditions; filter the soil, send it to a vacuum heat treatment device, heat it to 460°C, and keep the system pressure at 1Kpa for 30 minutes. The arsenous acid or arsenite in the soil is transformed into arsenic oxide, and the iodine element and arsenic oxide in the soil are volatilized from the soil, separated from the soil, cooled to room temperature, and the repaired soil is obtained...

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PUM

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Abstract

The invention discloses an arsenic contaminated soil remediation method. The method comprises steps as follows: firstly, soil of arsenic contaminated land parcel is digged out and treated by a crusher, and soil particles with size being 2-5 mm are obtained; a sodium citrate solution is prepared, the prepared sodium citrate solution is added to the soil particles in a ratio being 1L / kg, mixing andstirring are performed for 30 min, and a soil and solution mixture is obtained; a hydrogen iodide solution is added to the soil and solution mixture and stirred sufficiently, arsenate ions in the soilor arsenic acid and iodide ions react under the acidic condition to generate iodine and arsenious acid or arsenite; the obtained soil is filtered, fed into a vacuum heat treatment device, heated to 460 DEG C or higher and subjected to heat insulation for 30 min, arsenious acid or arsenite in the soil are converted into arsenious oxide, elementary iodine and arsenious oxide in the soil are volatilized from the soil and separated from the soil, then the soil is cooled to the room temperature, and remediated clean soil is obtained. The method has the advantages of being simple, feasible and goodin remediation effect, and arsenic can be removed from the soil.

Description

Technical field: [0001] The invention relates to the technical field of soil pollution restoration, in particular to a method for restoration of arsenic-contaminated soil. technical background: [0002] There are 1.8 to 2 million cancer cases and 1.4 to 1.5 million deaths in the country every year, which is related to the excessive pollution of agricultural products to a certain extent. Soil heavy metal pollution has gradually become the focus of public attention. [0003] Soil arsenic pollution mainly comes from atmospheric deposition, sewage irrigation and spraying of arsenic-containing pesticides. The content of arsenic in China's surface soil is distributed in a north-south direction. The arsenic content in the soil at higher altitudes is higher than that at lower altitudes. It decreases from the Qinghai-Tibet Plateau, Southwest China, and South China to the Northeast. Geochemical linkages. Among them, in a local area, as the topography goes from high to low, the cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 不公告发明人
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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