Plant restoring method of lead polluted soil

A lead-contaminated soil and phytoremediation technology, applied in the restoration of polluted soil and other directions, can solve the problems of difficult to develop large-scale polluted soil, soil structure damage, soil fertility degradation, etc., to achieve good social benefits, beautify the environment, and conserve water and soil. Effect

Inactive Publication Date: 2006-10-25
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 at a 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; at 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 / ha, and t...

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. It was determined that 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 shoot 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 when Se...

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, Sedum sedum The dry matter yield of sedum is 1530kg / ha, the lead content in the aboveground part is 146mg / kg, and the lead taken away from the soil is 223g / ha; at the level of pH 6.3, the dry matter yield of Sedum sedum is 1635kg / ha, and the lead content in the aboveground part is 1635kg / ha. The content is 121mg / kg, and the lead taken away from the soil is 198g / ha. After planting Sedum sedum, the available state (DTPA...

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Abstract

The invention relates to a phytoremediation method for lead-contaminated soil. The method is to plant the lead-enriched plant Sedum sedum in the lead-contaminated area, absorb a large amount of lead in the soil through the root system of Sedum sedum, and transport it upwards and transfer it to the aboveground part. When the plant grows to 30-40cm or 3-4 Harvesting and removing the aboveground part after one month can take away a large amount of lead from the soil, thereby achieving the purpose of quickly treating lead-contaminated soil. The method has low investment, small engineering quantity, no damage to soil physical and chemical properties, no secondary pollution, and can maintain water and soil and beautify the environment.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
Inventor 杨肖娥李廷强何冰
Owner ZHEJIANG UNIV
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