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Remediation method of heavy metal contaminated soil

A technology for polluted soil and heavy metals, applied in the field of polluted environment remediation, can solve the problems of increased number and activity of soil microorganisms, rare reports of applications, slow growth of plants, etc. Organic matter content, the effect of improving bioavailability

Inactive Publication Date: 2012-07-11
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the low content of nutrients and organic matter in heavy metal-polluted soil, slow plant growth and low restoration efficiency; the activity and quantity of soil microorganisms are also low, which indirectly affects the activation process of heavy metal ions, etc., we add nutrients and organic matter to the soil. Industrial and agricultural organic waste, thereby effectively stimulating plant growth and increasing the number and activity of soil microorganisms
At present, there are few reports on the application of industrial and agricultural organic wastes in the field of heavy metal contaminated soil phytoremediation

Method used

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  • Remediation method of heavy metal contaminated soil
  • Remediation method of heavy metal contaminated soil
  • Remediation method of heavy metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In the polluted soil with heavy metal cadmium content of 1.02 mg / kg, the soil nutrient available nitrogen content is 154.5 mg / kg, the available phosphorus content is 23 mg / kg, the available potassium content is 85 mg / kg, and the soil organic matter content is 7.8 g / kg; Plant Sedum sedum with a planting row spacing of 0.3 m and a plant spacing of 0.15 m. After the plants survive, manage them according to the management methods of common crops; range, apply 10 g of fermented cow dung to the soil, mix well, and then apply 0.5 L of rhamnolipid fermentation broth with a concentration of 4 g / L to the soil, mix well and cover with soil about 2 cm, and repeat to the soil every 60 days Apply 0.5 L of rhamnolipid fermentation broth with a concentration of 4 g / L, and mix well. Soil samples were collected after 180 days of cultivation, and the content of heavy metal cadmium in the soil was analyzed to evaluate the restoration effect.

[0028] After 180 days, the soil heavy metal c...

Embodiment 2

[0031] In the polluted soil with heavy metal cadmium content of 1.87 mg / kg, the soil nutrient available nitrogen content is 129.1 mg / kg, the available phosphorus content is 45 mg / kg, the available potassium content is 114 mg / kg, and the soil organic matter content is 12 g / kg; Plant sedum sedum with a planting row spacing of 0.3 m and a plant spacing of 0.2 m. After the plants survive, manage them according to the management methods of ordinary crops; range, apply 2 g of paper-making dry powder to the soil, and at the same time, apply 0.25 L of rhamnolipid fermentation broth with a concentration of 4 g / L to the soil, mix well and cover the soil with about 2 cm, and repeat the application of 0.25 L concentration is 4 g / L rhamnolipid fermentation liquid, mix well. Soil samples were collected after 180 days of cultivation, and the content of heavy metal cadmium in the soil was analyzed to evaluate the restoration effect.

[0032] After 180 days, the soil heavy metal cadmium conte...

Embodiment 3

[0035] In the polluted soil with heavy metal cadmium content of 2.55 mg / kg, the soil nutrient available nitrogen content is 81.1 mg / kg, the available phosphorus content is 33 mg / kg, the available potassium content is 84 mg / kg, and the soil organic matter content is lower than 8.3 g / kg; Sedum sedum was planted by hole sowing with a planting row spacing of 40 cm. After the plants survived, they were managed according to the management methods of common crops; Apply 20 g of Agaricus bisporus dregs to the soil, and at the same time, apply 0.5 L of rhamnolipid fermentation broth with a concentration of 4 g / L to the soil. 4 g / L rhamnolipid fermentation broth, mix well. Soil samples were collected after 180 days of cultivation, and the content of heavy metal cadmium in the soil was analyzed to evaluate the restoration effect.

[0036] After 180 days, the soil heavy metal cadmium content data can be seen in image 3 As shown, among them, the heavy metal cadmium content of phytoremed...

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Abstract

The invention relates to a remediation method of heavy metal contaminated soil, which comprises the following steps that: the heavy metal contaminated soil with lower soil nutrient and organic matter contents is selected to be remedied; the remediation plant sedum plumbizincicola is planted; an organic waste and a bio-surfactant are respectively added at a rhizosphere when the plant height grow to be 5 to 10cm; the bio-surfactant is repeatedly added to the soil every 60d; and after the remediation plant matures, the ground and underground parts are harvested and are centrally treated; and the content of heavy metal in soil is determined. By adding agricultural organic wastes, the soil nutrient and organic matter contents are improved, the increase of plant growth and root exudates is promoted, thus increasing the accumulation of heavy metal in underground roots and ground stems and leaves of the plants, and the quantity of rhizosphere soil microbes. The heavy metals are desorbed from soil particles by the bio-surfactant so as to improve the bioavailability of the heavy metals.

Description

[0001] technical field [0002] The invention relates to the technical field of remediation of polluted environment, in particular to a method for strengthening and remediating heavy metal polluted soil by using industrial and agricultural organic waste and biosurfactants. [0003] Background technique [0004] Heavy metal pollution comes from a wide range of sources, which are highly polluting and difficult to control. The heavy metals entering the soil cannot be decomposed by microorganisms and accumulate in the soil for a long time. Some of them are absorbed by crops and finally enter the human body through the food chain, which has certain ecological risks. At present, the area of ​​arable land polluted by heavy metals such as cadmium, arsenic, and lead in my country is nearly 10 million hectares, accounting for about 1 / 5 of the total arable land area. Tens of millions of tons of grain are polluted by heavy metals every year, causing huge economic losses. Therefore, i...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 张晶林先贵王一明
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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