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Plant restoring method of lead polluted soil

A lead-contaminated soil and phytoremediation technology, applied in the restoration of contaminated soil and other directions, can solve the problems of difficult to develop large-scale polluted soil, soil activity decline, soil structure damage, etc., to achieve good social benefits, small amount of engineering, beautification The effect of the environment

Inactive Publication Date: 2004-12-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These physical and chemical remediation technologies have their own advantages, but they all have large engineering quantities, high costs, difficulty in large-scale improvement of polluted soil, and easy to cause secondary pollution and lead to soil structure damage, soil activity decline and soil fertility degradation, etc. ecological problem

Method used

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  • Plant restoring method of lead polluted soil

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Effect test

Embodiment 1

[0016] Sedum sedum was transplanted in soil with different levels of lead pollution, nitrogen, phosphorus and potassium fertilizers were applied, and traditional crop management methods were used during the growth period, and the aboveground parts were harvested 4 months after transplanting. It has been determined that under the pollution level of 200mg / kg, the dry matter yield of Sedum sedum is 926kg / ha, the lead content in the aboveground part is 210mg / kg, and the lead taken away from the soil is 194g / ha; under the pollution level of 400mg / kg , the dry matter yield of Sedum sedum was 1148kg / ha, the lead content in the aboveground part was 180mg / kg, and the lead taken away from the soil was 207g / ha; under the pollution level of 800mg / kg, the dry matter yield of Sedum sedum was 981kg / ha ha, the lead content in the aboveground part was 186mg / kg, and the lead taken away from the soil was 182g / ha; at the pollution level of 1600mg / kg, the dry matter yield of Sedum sedum was 878kg / h...

Embodiment 2

[0018] Transplant Sedum sedum in lead-polluted soil with a lead content of 1469mg / kg. Harvest the aboveground part 4 months after the first transplant, fill the seedlings after harvest, and conduct the second harvest after 3 months. Apply after each harvest Nitrogen, phosphorus and potassium fertilizers and organic fertilizers are managed according to traditional crop management methods during the growth period. After the determination, after the first harvest, the dry matter yield of Sedum sedum was 1277kg / ha, the lead content in the aboveground part was 177mg / kg, and the lead taken away from the soil was 0.23kg / ha. After the second harvest, the yield of Sedum sedum was 3219kg / ha, the lead content in the aerial part was 139mg / kg, and the lead taken away from the soil was 0.48kg / ha. After the two harvests, the soil lead content changed from 1469mg / kg to 1403mg / kg, which is equivalent to a 4.49% reduction in the total lead in the soil. Afterwards, harvest once every 3 months or...

Embodiment 3

[0020] Sedum sedum was transplanted in lead-polluted soil with lead content of 6011mg / kg and different pH values, and nitrogen, phosphorus and potassium fertilizers were applied. During the growth period, the traditional crop management methods were used for management, and the above-ground parts were harvested 4 months after transplanting. It has been determined that at the level of 5.0, the dry matter yield of Sedum sedum is 1680kg / ha, the lead content in the aboveground part is 162mg / kg, and the lead taken away from the soil is 272g / ha; at the level of pH 5.5, the southeast The dry matter yield of sedum was 1530kg / ha, the lead content in the aboveground part was 146mg / kg, and the lead taken away from the soil was 223g / ha; at the pH level of 6.3, the dry matter yield of Sedum sedum was 1635kg / ha, and the aboveground The internal lead content is 121mg / kg, and the lead taken away from the soil is 198g / ha. After planting Sedum sedum, the available state (DTPA extraction state) ...

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Abstract

A vegetative repairing method for the soil polluted by lead features that the plant 'Dongnan sedum' is growing in said soil for absorbing a great deal of lead from the soil and then removed. Its advantages are high effect and low cost.

Description

technical field [0001] The invention relates to a phytoremediation method for lead-contaminated soil. Background technique [0002] Lead has become one of the most common heavy metal pollutants in the environment. Many human activities, such as mining, smelting, incineration, use of leaded gasoline, pigments, fertilizers and pesticides, etc., are the main sources of lead pollution. In my country's related enterprises that produce and use lead, the lead dust and lead smoke in the air exceed the standard by 13-1417 times. The use of mud as fertilizer can make the soil suffer from lead pollution. The lead content in farmland soil in the suburbs of some industrial cities is more than 100 times higher than the background value, and the lead content in rice produced is dozens of times higher than that in non-polluted areas. Excessive intake of lead by the human body can cause damage to the central nervous system, such as fatigue, headache, convulsions, ...

Claims

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Application Information

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IPC IPC(8): B09C1/10
Inventor 杨肖娥李廷强何冰
Owner ZHEJIANG UNIV
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