Method for degrading polychlorinated biphenyl in soil by utilizing mixed powder of zero-valence iron and magnesium metals

A zero-valent metal and mixed powder technology is applied in the field of remediation and environmental treatment of polychlorinated biphenyl-contaminated soil, which can solve the problems of complex operating conditions and high costs, and achieve the effects of simplifying reaction conditions, easy operation and saving soil remediation costs.

Inactive Publication Date: 2011-10-12
BEIJING UNIV OF CHEM TECH
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AI Technical Summary

Problems solved by technology

[0007] The invention provides a new method for degrading polychlorinated biphenyls in soil, the purpose of which is to improve the method of using metal to remediate soil polychlorinated biphenyl pollution, solve the problems of complex operating conditions and high cost in traditional metal remediation methods, and realize pollution Large area in situ remediation of soil

Method used

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  • Method for degrading polychlorinated biphenyl in soil by utilizing mixed powder of zero-valence iron and magnesium metals
  • Method for degrading polychlorinated biphenyl in soil by utilizing mixed powder of zero-valence iron and magnesium metals

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 5.6g of iron powder and 3.6g of magnesium powder respectively, fully mix the weighed iron powder and magnesium powder, grind them in a mortar, and pass through a 100-mesh sieve to obtain the desired metal-iron-magnesium mixed powder.

[0031] Weigh 10 g of PCBs-contaminated soil (PCBs concentration: 2258.85 μg / kg), add 0.01 g of the zero-valent metal iron-magnesium mixed powder prepared above, mix well, add 1 mL of deionized water to adjust the soil humidity, under indoor conditions Stand still and react for 9 hours. The reacted soil samples were dried and extracted for pretreatment, and detected by gas chromatography, the concentration of PCBs in the soil was 358.38 μg / kg, and the degradation efficiency was 84.13%.

Embodiment 2

[0033] Weigh 10g of polychlorinated biphenyl contaminated soil (PCBs concentration: 2258.85 μg / kg), add 0.02g of the zero-valent metal iron-magnesium mixed powder prepared in Example 1, mix well, add 1mL of deionized water to adjust the soil humidity, in The reaction was left to stand for 9 hours under room conditions. After the reaction, the soil sample was dried and extracted for pretreatment, and detected by gas chromatography, the concentration of PCBs in the soil was 246.2 μg / kg, and the degradation efficiency reached 89.10%.

Embodiment 3

[0035] Weigh 10 g of polychlorinated biphenyl contaminated soil (PCBs concentration: 2258.85 μg / kg), add 0.02 g of the mixed powder of zero-valent metal iron and magnesium prepared in Example 1, mix well, and add 1 mL of NH with a mass fraction of 2%. 4 Cl solution was used to adjust the soil humidity, and the reaction was allowed to stand for 9 hours under indoor conditions. The reacted soil samples were dried and extracted for pretreatment, and detected by gas chromatography, the concentration of PCBs in the soil was 107.91 μg / kg, and the degradation efficiency was 95.22%.

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Abstract

The invention relates to a method for degrading polychlorinated biphenyl in soil by utilizing mixed powder of zero-valence iron and magnesium metals. The method comprises the following steps of: adding the mixed powder of iron and magnesium metals with the mol ratio of 0.4-0.8 into a polychlorinated biphenyl-polluted soil sample, adding NH4Cl or NH4NO3 solution with the mass fraction of 0-10% to regulate the humidity of the soil, and standing and reacting for more than 1 hour at room temperature, thus the polychlorinated biphenyl in the soil is degraded and the degrading efficiency reaches more than 98%. In the method, the reaction raw materials are available, the reaction conditions are simple, and the operation is easy, thus the method has good economic benefit and environmental benefit and has a better application prospect in the large-area polychlorinated biphenyl-polluted soil repairing.

Description

1. Technical field [0001] The invention utilizes bimetallic mixed powder to degrade polychlorinated biphenyls in soil by virtue of the principle of micro-primary batteries, and belongs to the field of restoration and environmental treatment of polychlorinated biphenyl-contaminated soil. 2. Background technology [0002] Polychlorinated biphenyls (PCBs) are the most representative of the 12 persistent organic pollutants (POPs) of international concern, also known as dioxins. compound. The semi-volatility, long-range migration and bioaccumulation of PCBs make them widely distributed in environmental samples, and their biological toxicity makes PCB pollution one of the hot environmental issues today. In view of this, the research on the treatment methods of PCB pollution in various environmental media involves various fields such as physics, chemistry, and biology. The incompleteness of physical methods and the timeliness of biological methods make chemical methods the main r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 李保山张静韩春英
Owner BEIJING UNIV OF CHEM TECH
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