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In-situ remediation method of arsenic soil pollution

A technology for soil pollution and in-situ remediation, applied in the field of in-situ remediation of arsenic soil pollution, can solve problems such as crop and groundwater pollution and threats, and achieve the effects of not easy secondary pollution, low cost, and simple operation.

Active Publication Date: 2014-09-24
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fixed arsenic is often easily re-released when the environmental redox conditions fluctuate, causing potential (long-term) pollution and threats to crops and groundwater

Method used

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  • In-situ remediation method of arsenic soil pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The migration of arsenic in surface soil by medium addition was simulated by column experiments under laboratory conditions:

[0018] Layered collection of 0-20, 20-40cm cultivated soil in Zhangshi, Shenyang, where the arsenic background value is about 10mg·Kg -1 . By artificially adding Na to the surface layer 0-20cm 3 AsO 4 ·7H 2 O to get about 45mg·Kg of arsenic -1 The arsenic-contaminated surface soil (hereinafter referred to as the original soil 0-20).

[0019] The content of each substance in the liquid medium is: 2mL·L -1 Sodium Lactate, KH 2 PO 4 (1.0mM), NH 4 Cl (4.7mM), KCl (6.7mM), CaCl 2 2H 2 O (0.9mM), NaCl (17mM), MgCl 2 ·6H 2 O (3.0mM), Na 2 SO 4 (10mM), add yeast extract powder (0.5g·L -1 ) (purchased from Beijing Aoboxing Biotechnology Co., Ltd.). Each of the substances is prepared with water. At the same time, water (conductivity ≈ 6.91μS·cm -1 ) as a control group for leaching the soil.

[0020] at 0.342cm h -1 Inject the above-men...

Embodiment 2

[0032] The difference from Example 1 is that the content of each substance in the liquid medium is: 10mM glucose, 1mL·L -1 Sodium Lactate, KH 2 PO 4 (2.0mM), NH 4 Cl (5.0mM), KCl (7.0mM), CaCl 2 2H 2 O (1.0mM), NaCl (20mM), MgCl 2 ·6H 2 O (3.0mM) and Na 2 SO 4 (15mM); In addition, add yeast extract powder (0.6g·L -1 ). Each of the substances is prepared with water. And at 0.2cm·h -1 The above-mentioned medium was injected into the surface soil at the flow rate.

Embodiment 3

[0034] The difference from Example 1 is that

[0035] The content of each substance in the liquid medium is: glucose (10mM), KH 2 PO 4 (3.0mM), NH 4 Cl (6.0mM), KCl (10.0mM), CaCl 2 2H 2 O (2.0mM), NaCl (30mM), MgCl 2 ·6H 2 O (5.0mM) and Na 2 SO 4 (10mM), add yeast extract powder (1.0g·L -1 ). Each of the substances is prepared with water. And at 0.5cm·h -1Inject the above medium into the surface soil at a flow rate of

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Abstract

The invention belongs to the field of remediation methods of soil heavy metal pollution, and particularly relates to an in-situ remediation method of arsenic soil pollution. The method comprises the following steps: adding a liquid medium into arsenic-polluted soil to be treated to allow the arsenic-polluted soil to be treated to be in reduction environment, stimulating the soil microbial growth, distributing arsenic from the soil solid phase to the soil liquid phase, then transferring the arsenic to a layer below a plough layer, fixing the arsenic in deep soil to realize remediation of the arsenic-polluted soil. According to the method of the invention, arsenic is distributed from the soil solid phase to the soil liquid phase through a series of biochemical reactions, and then is transferred to a layer below the plough layer and fixed in deep soil, so as to realize remediation of arsenic-polluted soil. The method is simple in operation and low in cost, and when compared with conventional methods, the method is safer and more reliable.

Description

technical field [0001] The invention belongs to the field of remediation of soil heavy metal pollution, in particular to an in-situ remediation method of arsenic soil pollution. Background technique [0002] Arsenic (As) is a toxic heavy metal element that widely exists in nature. Arsenic pollution caused by natural and man-made causes is a global environmental problem. The soil has a strong ability to hold arsenic, and it is easy to form arsenic pollution and enrichment. According to the survey, the soil in many cities and industrial and mining areas in my country has been polluted by arsenic to varying degrees, which has caused serious damage to the ecological environment, food safety and human health. threaten. Arsenic exists mainly in the form of As(III) and As(V) in soil, and As(V) mainly exists in oxidizing soil; while As(III) exists more in reducing soil and has more Greater mobility. At present, the remediation of arsenic-contaminated soil mainly includes engineeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 贾永锋宋雨许丽英王少峰
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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