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Remediation method for degrading soil cadmium

A remediation method and soil technology, applied in the field of soil pollution remediation, to achieve good remediation effect, broad application prospects, and resource saving effects

Pending Publication Date: 2019-06-07
FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a repair method for degrading soil cadmium, which solves the problem that the prior art can only repair a single form of cadmium ions

Method used

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  • Remediation method for degrading soil cadmium
  • Remediation method for degrading soil cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A repair method for degrading soil cadmium, comprising the steps of:

[0028] Step 1, taking a sample of cadmium-contaminated soil, and measuring the content of cadmium in the soil sample.

[0029] Step 2: Crushing and sieving the top 10 cm soil contaminated by cadmium to remove stones and gravel, and then weighing the soil to be repaired (1) for later use.

[0030] Step 3, wetting the soil is to add water to the cadmium-contaminated soil, stir evenly, and then fill the wet soil to be repaired (1) into the PVC reaction column (2), and the two ends of the PVC reaction column (2) are respectively Connect with activated carbon (3) and iron filings (4), insert the lower end of the carbon rod (4) into the activated carbon (3), and connect the upper end of the carbon rod (6) with the multimeter (9) through the wire (8) ) electrical connection; insert the lower end of the iron rod (7) into the iron filings (4), and the upper end of the iron rod (7) is electrically connected w...

Embodiment 2

[0034] The difference between this embodiment and Embodiment 1 is that in Step 4, the weight of the soil to be repaired: the weight of the repairing agent=100:1.0.

Embodiment 3

[0036] The difference between this example and Example 1 lies in: the weight of the soil to be repaired in Step 4: the weight of the repairing agent=100:1.5.

[0037] The comparison example is to plant rice on the soil without any treatment.

[0038] On the soil after comparative example 1 and through embodiment 1, 2, 3 remediation, each planting area is approximately half acre of paddy rice. Cadmium content in rice. Obtain the following experimental data:

[0039] Example

Average cadmium content (mg / kg)

Example 1

0.32

Example 2

0.21

Example 3

0.15

Comparative example 1

0.47

[0040]According to the regulations in my country's current national standard "National Food Safety Standard Food Contaminant Limits" (GB 2762-2012), the cadmium limit value in paddy, brown rice, and rice is 0.20mg / kg, thus it can be seen that by the present invention, The rice grown in mildly cadmium-polluted soil can meet the national food safe...

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Abstract

The invention provides a remediation method for degrading soil cadmium. The remediation method for degrading the soil cadmium comprises the following specific steps: step one, detecting the content ofcadmium in soil; step two, crushing, sieving and weighing the soil on a soil surface layer; step three, wetting the soil, and removing part of the cadmium in the soil to obtain semi-remediated soil;step four, mixing the semi-remediated soil with a remediating agent, and standing to obtain improved soil; and step five, planting bidens pilosa in the improved soil, and harvesting the bidens pilosawith roots and ashing after the growing season is finished to obtain finished soil. The cadmium polluted soil is treated by cathode and anode electrodes and the remediating agent, and the bidens pilosa is planted on the soil, an effect of remediating the cadmium polluted soil under combined action of electrokinetic remediation, chemical remediation, microbial remediation and plant remediation is achieved, various forms of cadmium existing in the soil are removed as much as possible, the content of the cadmium in the soil is reduced, the remediation effect is good, the method is easy to implement, resources are saved, and the safety is high. The method has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a remediation method for degrading soil cadmium. Background technique [0002] With the increasingly serious destruction of the global environment, soil pollution has become the focus of research all over the world, and heavy metals are considered to be one of the main pollutants in soil. At present, heavy metal cadmium has been found to exceed the standard in many rice producing areas in China, which has shocked the whole people. The mobility of cadmium in the soil is small, and after entering the human body through the food chain, the potential harm is extremely great, which is not conducive to human health and social stability. The "cadmium rice crisis" has sounded the alarm bell of soil pollution. [0003] Cadmium in polluted soil exists in various forms, including ion-exchange state, carbonate-bound state, organic-bound state, and iron-mangane...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/06B09C1/08B09C1/085B09C1/10B09C1/105C09K17/48C09K2101/00
Inventor 杜臻杰肖亚涛齐学斌李亮张波李平梁志杰
Owner FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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