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Method for repairing arsenic-polluted soil

An arsenic pollution and soil technology, applied in the field of soil pollution remediation, can solve the problems of complicated separation and treatment, long remediation time, high power consumption, etc., and achieve the effects of improving removal rate, saving dosage and increasing surface area

Active Publication Date: 2017-09-01
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as long repair time, excessive power consumption, complicated subsequent separation and high cost

Method used

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  • Method for repairing arsenic-polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for remediating arsenic-contaminated soil, the method is divided into the following steps:

[0030] Step 1. Soil flooding and detection of arsenic content: Take the pulverized arsenic-contaminated target soil and pour water into it. After stirring evenly, keep the water content at 35%. Use the electrochemical workstation to collect the potential of the glass microelectrode in the extract, and calculate the first The average value of the time-long potential, substituted into the relational expression The ion concentration of arsenic is obtained, and then the arsenic content to be measured in the soil is calculated to be 143.7mg / kg.

[0031] Step 2, arsenic ion enrichment: the arsenic ion enrichment device such as figure 1 As shown, the arsenic-contaminated target soil is placed in the 1-soil sample chamber, and the upper and lower sides are DC electric fields. In the figure, the 4-DC power supply is connected in series with the 5-ammeter, the soil is located i...

Embodiment 2

[0037] A method for remediating arsenic-contaminated soil, the method is divided into the following steps:

[0038] Step 1. Soil flooding and detection of arsenic content: Take the pulverized arsenic-contaminated target soil and pour water into it. After stirring evenly, keep the water content at 35%. Use the electrochemical workstation to collect the potential of the glass microelectrode in the extract, and calculate the first The average value of the time-long potential, substituted into the relational expression The ion concentration of arsenic is obtained, and then the arsenic content to be measured in the soil is calculated to be 158.2mg / kg.

[0039] Step 2, arsenic ion enrichment: the arsenic ion enrichment device such as figure 1 As shown, the arsenic-contaminated target soil is placed in the 1-soil sample chamber, and the upper and lower sides are DC electric fields. In the figure, the 4-DC power supply is connected in series with the 5-ammeter, the soil is located i...

Embodiment 3

[0045] A method for remediating arsenic-contaminated soil, the method is divided into the following steps:

[0046] Step 1. Soil flooding and detection of arsenic content: Take the pulverized arsenic-contaminated target soil and pour water into it. After stirring evenly, keep the water content at 35%. Use the electrochemical workstation to collect the potential of the glass microelectrode in the extract, and calculate the first The average value of the time-long potential, substituted into the relational expression The ion concentration of arsenic is obtained, and then the arsenic content to be measured in the soil is calculated to be 159.1mg / kg.

[0047] Step 2, arsenic ion enrichment: the arsenic ion enrichment device such as figure 1 As shown, the arsenic-contaminated target soil is placed in the 1-soil sample chamber, and the upper and lower sides are DC electric fields. In the figure, the 4-DC power supply is connected in series with the 5-ammeter, the soil is located i...

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Abstract

The invention discloses a method for repairing arsenic-polluted soil. The method is divided into the following steps that 1, the soil is submerged, and the arsenic content is detected; 2, arsenic ions are enriched; 3, the surface of the soil is tiled with arsenic-polluted soil repairing agents by 3-5 cm; 4, lighting and repairing are conducted; and 5, a power source is turned off, and a solidified repairing agent layer on the surface of the soil is removed. According to the provided method for repairing the arsenic-polluted soil, arsenic is enriched to the surface layer of the soil through an electrochemical method, the soil repairing difficulty is greatly lowered, and the using amount of the soil repairing agents is saved; the repairing agent repairing process and the photochemical repairing process are conducted at the same time, and As (III) in the soil is removed to a great extent; and stable-state arsenic after repairing can be removed together with the solidified repairing agents, so that the removing rate of the arsenic in the soil is ensured, and the problem of arsenic pollution in the soil is fundamentally solved.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating arsenic-contaminated soil. Background technique [0002] Among the environmental chemical pollutants, arsenic is one of the most common and most harmful pollutants to the health of residents. Especially with the development of modern industrial and agricultural production, the pollution of arsenic to the environment is becoming more and more serious. The main sources of arsenic pollution mainly include: (1) Mining and smelting of arsenic. In particular, the indigenous method of smelting arsenic, which is widely spread in our country, often causes continuous pollution of arsenic to the environment; (2) in the development and smelting of certain non-ferrous metals, more or less arsenic compounds are often discharged, polluting the surrounding environment; (3) The widespread utilization of arsenic compounds, such as the production and us...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C1/085
Inventor 李庆召秦小艳梁丽珍刘蕾高爱华牛俊玲贾晓凤
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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