Method for restoring soil polluted by lead by utilizing super enrichment plant-Debregeasia saeneb

Abstract

A method for repairing the Pb polluted soil by the super-enriching plant Shuima willow includes such steps as planting the Shuima willow in the polluted soil for absorbing the Pb from the polluted soil, and removing them from the soil.

Description

technical field

[0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating soil polluted by heavy metals by using hyperaccumulator phytoremediation. technical background

[0002] There are usually two ways for heavy metals to pollute soil: one is the environmental pollution caused by metal mining activities. Serious soil; heavy metal polluted soil caused by leaching and other reasons during the stacking of mining waste rocks; soil pollution caused by mine wastewater containing high concentrations of heavy metals, etc. The second is heavy metal polluted soil caused by industrial sewage irrigation of farmland. The phenomenon of lead-contaminated soil is relatively common in some parts of my country, and it is especially serious in some non-ferrous metal mining areas and surrounding areas of smelters in Yunnan Province. The average lead content in the soil of a typical non-ferrous metal mining area in south...

Examples

Embodiment 1

[0021] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 6000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In March, the seeds of water hemp willow were soaked in warm water at 50°C for half an hour and then sown into the soil. They were allowed to grow naturally. After the flowering period, the aboveground parts were harvested. The lead content is 1400mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 700mg / kg, which is equivalent to reducing the lead content in the soil by 12.5%.

Embodiment 2

[0023] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 15000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In April, the seeds of water hemp willow were soaked in warm water at 60°C for half an hour and then sown into the soil. During the growth of water hemp willow, urea was used as top dressing, and the application rate was 200kg / hm 2 , let it grow naturally, and harvest its aerial parts after it reaches the fruiting period. After analysis and determination, the lead content in the aerial part is 1850mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 620mg / kg, which is equivalent to reducing the lead content in the soil by 22.5%. After harvesting, it can be incinerated to generate electricity.

Embodiment 3

[0025] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 10000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In March, the seeds of water hemp willow were soaked in warm water at 50°C for half an hour and then sown into the soil. They were allowed to grow naturally. After the flowering period, the aboveground parts were harvested. The lead content is 1400mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 700mg / kg, which is equivalent to reducing the lead content in the soil by 12.5%. Metal recycling is carried out after harvesting.

technical field

[0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating soil polluted by heavy metals by using hyperaccumulator phytoremediation. technical background

[0002] There are usually two ways for heavy metals to pollute soil: one is the environmental pollution caused by metal mining activities. Serious soil; heavy metal polluted soil caused by leaching and other reasons during the stacking of mining waste rocks; soil pollution caused by mine wastewater containing high concentrations of heavy metals, etc. The second is heavy metal polluted soil caused by industrial sewage irrigation of farmland. The phenomenon of lead-contaminated soil is relatively common in some parts of my country, and it is especially serious in some non-ferrous metal mining areas and surrounding areas of smelters in Yunnan Province. The average lead content in the soil of a typical non-ferrous metal mining area in south...

Examples

Embodiment 1

[0021] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 6000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In March, the seeds of water hemp willow were soaked in warm water at 50°C for half an hour and then sown into the soil. They were allowed to grow naturally. After the flowering period, the aboveground parts were harvested. The lead content is 1400mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 700mg / kg, which is equivalent to reducing the lead content in the soil by 12.5%.

Embodiment 2

[0023] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 15000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In April, the seeds of water hemp willow were soaked in warm water at 60°C for half an hour and then sown into the soil. During the growth of water hemp willow, urea was used as top dressing, and the application rate was 200kg / hm 2 , let it grow naturally, and harvest its aerial parts after it reaches the fruiting period. After analysis and determination, the lead content in the aerial part is 1850mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 620mg / kg, which is equivalent to reducing the lead content in the soil by 22.5%. After harvesting, it can be incinerated to generate electricity.

Embodiment 3

[0025] The average lead content in a lead-contaminated soil is 800mg / kg. Apply 10000kg / hm to the soil 2 Farmyard manure was used as the base fertilizer. In March, the seeds of water hemp willow were soaked in warm water at 50°C for half an hour and then sown into the soil. They were allowed to grow naturally. After the flowering period, the aboveground parts were harvested. The lead content is 1400mg / kg, and the average lead content in the soil is reduced from the original 800mg / kg to 700mg / kg, which is equivalent to reducing the lead content in the soil by 12.5%. Metal recycling is carried out after harvesting.