Method for carrying out microwave-assisted chemical leaching and restoring on soil in heavy metal pollution site

A microwave-assisted, chemical leaching technology, applied in the field of microwave-enhanced chemical leaching repair, to reduce the repair time and meet the effect of rapid repair

Active Publication Date: 2015-03-18
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the remediation of Cd, Pb, and Zn heavy metal-contaminated soil, the present invention provides a microwave-enhanced chemical leaching repair method for Cd, Pb, and Zn-contaminated soil. By introducing microwaves into EDDS, leaching is applied to heavy metals Cd, Pb, and Zn. Soil remediation of Pb and Zn contaminated sites, realizing fast, efficient and green soil leaching and remediation

Method used

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  • Method for carrying out microwave-assisted chemical leaching and restoring on soil in heavy metal pollution site
  • Method for carrying out microwave-assisted chemical leaching and restoring on soil in heavy metal pollution site
  • Method for carrying out microwave-assisted chemical leaching and restoring on soil in heavy metal pollution site

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Remediation Effect of EDDS Washing Treatment on Heavy Metal Contaminated Site Soil

[0030] The remediation test contaminated site is located in a certain place in Yuhua District, Nanjing City, Jiangsu Province. It is the surface soil near the heavily polluting enterprise Meishan Iron and Steel Plant. The soil samples were air-dried, ground, passed through a 2 mm sieve, and stored in a desiccator in a dark place. Part of the soil sample was ground by the quartering method and passed through a 0.125 mm sieve for full analysis of heavy metals. Weigh 0.50 g of the above 2 mm sieved soil samples and place them in a series of 50 ml polyethylene plastic bottles with a water-to-soil ratio of 30. Ratio of 2 (the ratio of water to soil and the molar ratio of eluent were determined through pre-experiments), and the shaker was shaken for a certain period of time (0.2, 0.5, 1, 3, 4, 6 h) under the conditions of 25 °C and 180 r / min.

[0031] Figure 1 shows the change o...

Embodiment 2

[0033] Remediation Effect of Microwave Enhanced EDDS Washing on Heavy Metal Contaminated Site Soil

[0034] The basic steps are the same as those in Embodiment 1, except that microwaves are introduced, and the treatment groups include microwave time group and microwave power group. Figure 2-5 shows the change of heavy metal concentration in soil with time (3-15 min) under microwave (power 500 W) enhanced EDDS leaching treatment. It can be seen from the figure that after 3 min of microwave irradiation, the leaching removal rate of various metals in soil samples increased significantly. With the prolongation of microwave irradiation time, the leaching removal rates of heavy metals in soil samples showed an overall upward trend. Among them, Cd The removal rate of Zn continued to increase with the extension of the irradiation time, the removal rate of Zn slowed down after 10 min, and the removal of Pb hardly changed with the irradiation time after 5 min of microwave irradi...

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Abstract

The invention discloses a method for carrying out microwave-assisted chemical leaching and restoring on soil in a heavy metal pollution site. The method includes an A process and a B process. The A process is adding of eluting agents, namely ethylenediaminedisuccinic acid (EDDS). The B process is synchronous application of microwave radiation. The quantity of the eluting agents EDDS in the A process is determined according to the contents of poisonous heavy metal cadmium (Cd), plumbum (Pb) and zinc (Zn) in the soil. In the B process, the microwave power is set to be 500 watts (W), 700W and 900W, and the microwave time is within 3-15 minutes. The method for carrying out microwave-assisted chemical leaching and restoring on the soil in the heavy metal pollution site can substantially reduce the time for leaching and restoring of the polluted soil, and is capable of achieving removal of heavy metal in the polluted soil in several minutes and meeting the requirement of the heavy metal pollution site for quick restoration.

Description

technical field [0001] The invention relates to the field of soil heavy metal pollution control in environmental protection, in particular to a microwave-enhanced chemical leaching repair method for soil polluted by Cd, Pb and Zn. Background technique [0002] According to statistics, the area of ​​cultivated land polluted by different degrees of heavy metals in my country is close to 2×10 5 hm 2 , accounting for about 1 / 5 of the total cultivated land area. Soil heavy metal pollution not only reduces the quality and yield of agricultural products, but also accumulates in the human body through the food chain, endangering human health and life. The restoration of heavy metal-contaminated soil has always been a research hotspot at home and abroad. [0003] There are many remediation technologies for soil heavy metal pollution, but each method has its scope of application and limitations. For example, plant, microorganism, and animal remediation are limited to low-concentrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 郭红岩薛腊梅孙媛媛尹颖刘志超季荣王晓蓉
Owner NANJING UNIV
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