Method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants

A phytoremediation and electrodynamic technology, applied in the restoration of polluted soil, etc., can solve the problems of difficult and efficient, environmentally friendly soil restoration technology, secondary pollution of chemical restoration technology, slow effect of physical restoration technology, etc., to speed up phytoremediation. Process, strong repair effect, and complete effect of heavy metal adsorption

Inactive Publication Date: 2018-08-24
CHANGZHOU UNIV
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  • Application Information

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Problems solved by technology

Although these technologies have their own advantages, in actual operation, physical remediation technology is slow to take effect, chemical remediation technology is likely to cause secondary pollution, and some technologies are

Method used

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  • Method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants
  • Method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The method used in the present invention can strengthen the absorption capacity of ryegrass to soil cadmium, and improve its soil restoration efficiency.

[0023] The soil to be tested came from the green belt near the cadmium oxide workshop of a chemical plant in Beijing. According to the soil quality survey results, the total cadmium content in this area reached 48 mg / kg, which greatly exceeded the national soil heavy metal limit standard. It can be seen that the cadmium pollution in this area is very serious.

[0024] Aiming at the research on how the electric field absorbs metals to plants, this experiment is to insert electrodes into the polluted soil, then plant ryegrass in the electrode plates, adjust the electric field strength through the electrode controller, and use voltage / current to control the voltage and current in the soil. monitoring system to monitor. with HNO 3 -HF (5:2) digestion method to treat soil and plant samples, and determine th...

Embodiment 2

[0027] Embodiment 2: The method used in the present invention can promote the directional movement of cadmium in soil, accelerate the electromigration of cadmium ions, and improve the removal efficiency of cadmium in soil.

[0028] Take the contaminated soil to be tested in batches, and then add an appropriate amount of ultrapure water to each batch of soil samples, so that the ratio of soil saturated water content to soil water saturation is about 5:3, stir evenly, and put it into the reactor layer by layer after standing still In the process, after vibrating the soil sample, the soil sample is compacted, and the surface layer is sucked to press out the liquid. Two graphite electrodes were respectively inserted in the soil, and the distance between the positive and negative electrodes was 18cm. Connect to a DC power supply and operate under the action of an electric field.

[0029] Take a certain amount of polluted soil and extract it with ultrapure water, HCL solution and H...

Embodiment 3

[0032] Treat the polluted soil according to the method described in "Example 2", install electrodes, control the strength of the electric field, and set up controls. After the system is running, a certain amount of soil samples are taken at intervals, specifically at 0, 2, 4, 6, 10 and 15 hours, placed in a weighing bottle after sampling, and dried at 101±4°C until Constant weight, weigh after cooling to room temperature, and calculate the moisture content of the soil sample. Take 3g of soil sample, add 15ml of ultrapure water, shake the mixture for 35min, let it stand for 15min, measure the conductivity and pH value of the supernatant soil liquid with conductivity and pH meter respectively.

[0033] The experimental results show that the electric field control can weaken the influence of the electric field on soil pH, water content and electrical conductivity, thereby enhancing the effect of electrokinetic soil remediation.

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Abstract

A method to restore heavy metal contaminated soil via electrodynamics in conjunction with plants belongs to the technical field of environmental protection. The method uses direct-current weak electric field to stimulate the growth of plants and improve the ability of the plants to adsorb and accumulate heavy metals. The method comprises: inserting a pair of electrodes into soil, with plant rootspositioned between the electrodes and the depth of the electrodes equal to plant root length; applying unidirectional direct-current weak electric field between the electrodes for exciting purpose, tobe specific, cultivating restoring plants under the weak electric field, dividing to obtain restoration belts, clearing them, installing a restoration device, planting restoring plants, and providingcontinuous power. The method has the advantages that the direct-current weak electric field is applied to a soil region under restoration, migration of the heavy metal contaminants in the soil is quickened, the growth of the plants is stimulated by the electric field, and the ability of the plants to adsorb heavy metals is improved as well; the method is simple to perform, low in cost and high inefficiency, is suitable for in-situ treatment of contaminated soil, and never causes a risk to the surroundings.

Description

technical field [0001] The invention relates to a method for enhancing phytoremediation of heavy metal polluted soil by using a direct current electric field. It belongs to the technical field of environmental protection. Background technique [0002] In recent years, with the continuous development of the modernization of industrial and agricultural production, the problem of soil pollution by heavy metals in my country has become increasingly serious, especially the cadmium in the soil cannot be degraded and the cadmium content exceeds the standard. Nowadays, a large amount of soil cannot be cultivated. Soil pollution will not only reduce the export of agricultural products, cause direct economic losses, but even pose a huge threat to the ecological environment. At present, soil pollution has become an important factor affecting human health and threatening the safety of agricultural products. Therefore, the remediation research of heavy metal pollution is urgent. [00...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/085B09C1/105
Inventor 彭明国杨彦陈瑞琰
Owner CHANGZHOU UNIV
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