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Method for ecologically restoring heavy metal contaminated soil

A technology for polluted soil and ecological restoration, applied in the field of soil restoration, can solve the problems of poor tolerance, small biomass, slow growth of hyperaccumulator plants, etc., and achieve wide adaptability, outstanding stress resistance, and rich genetic diversity. Effect

Inactive Publication Date: 2014-05-14
SOUTHEAST UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for ecological restoration of heavy metal-contaminated soil, so as to solve the problems of slow growth of hyperaccumulator plants, small biomass, poor tolerance to other metals coexisting in soil, etc. used in existing ecological restoration technology

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Examples

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Effect test

Embodiment 1

[0025] A pot experiment using artificial chelating agent combined with bamboo willow to remediate heavy metal Pb polluted soil. Put the unpolluted natural air-dried test soil into the test pot at 4kg / pot. Add quantitative N, P, and K fertilizers (the amounts of urea, potassium dihydrogen phosphate, and potassium sulfate are respectively 400, 200, and 300 mg / kg soil) and 50 mg / kg soil EDTA in each pot of soil, and add Pb0 mg respectively / kg soil, 250mg / kg soil, 500mg / kg soil, 750mg / kg soil, 1000mg / kg soil were fully mixed with soil samples to form heavy metal contaminated soil. Deionized water was added to each treatment up to 70% of field capacity. After balancing for 10 days, transplant two bamboo willow seedlings of the same size and height of 1.5-1.8m in each pot. All treatments were repeated 3 times. The results showed that bamboo willow can absorb heavy metal ions Pb while growing. The formula for the absorption rate of bamboo willow to heavy metals: Y=concentration ...

Embodiment 2

[0029] A pot experiment of using artificial chelating agent combined with bamboo willow to remediate heavy metal Cu polluted soil. Put the unpolluted natural air-dried test soil into the test pot at 4kg / pot. Add quantitative N, P, and K fertilizers (400, 200, and 300 mg / kg of urea, potassium dihydrogen phosphate, and potassium sulfate respectively) and Cu500 mg / kg of soil to each pot of soil and mix thoroughly to form heavy metal-contaminated soil . The control group did not add EDTA, and the treatment group added 350 mg / kg of EDTA to each pot of soil. Add deionized water to each pot of soil to reach 70% of the field water capacity. After balancing for 10 days, transplant two bamboo willow seedlings of the same size and height of 1.5-1.8m in each pot. All treatments were repeated 3 times. The soil was tested after bamboo willow cultured for 45 days. The results showed that the content of Cu in the aboveground part of the bamboo willow in the control group and the treatmen...

Embodiment 3

[0031]A pot experiment of using plant growth regulator, artificial chelating agent and bamboo willow to remediate heavy metal Pb polluted soil. Put the unpolluted natural air-dried test soil into the test pot at 4kg / pot. Add quantitative N, P, and K fertilizers (the amounts of urea, potassium dihydrogen phosphate, and potassium sulfate are 400, 200, and 300 mg / kg soil) and Pb600 mg / kg to fully mix with soil samples to form heavy metals in each pot of soil. pollute the soil. Add EDTA20mg / kg soil to each pot, and add deionized water to 70% of the field water capacity. After balancing for 10 days, two bamboo willow seedlings with a height of 1.5-1.8 m without soaking roots were transplanted in each pot in the control group, and bamboo willow seedlings with a height of 1.5-1.8 m in height soaked with 50 mg / L NAA for 48 hours were transplanted in each pot of the treatment group. Two seedlings. All treatments were repeated 3 times. The soil was tested after bamboo willow culture...

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Abstract

The invention discloses a method for ecologically restoring heavy metal contaminated soil. According to the method, heavy metals are absorbed by a plant growth regulator, an artificial chelating agent and bamboo willows in a combining manner. The method disclosed by the invention can be used for absorbing heavy metal ions, namely Pb, Cu, Zn, Cd and Cr, by utilizing the high-quality bamboo willows which is fast in growth, high in resistance and good in material and accelerating the absorption of the bamboo willows on the heavy metal ions by adopting the plant growth regulator and the artificial chelating agent, so that the purpose of ecological restoration for 3-4 years can be achieved; after the heavy metal contaminated soil is ecologically restored through the bamboo willows, the concentration of the Pb, the Cu, the Zn, the Cd and the Cr which are contained in the soil can accords to the II class standard of the 'Environmental quality standard for soils (GB15618-1995)'.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for ecological remediation of heavy metal polluted soil. Background technique [0002] Sewage irrigation, discharge of industrial waste residues and urban waste, and stacking of industrial waste can lead to heavy metal pollution in the soil, and heavy metals in the soil can be indirect through the pathway of "soil-plant-human body" or "soil-water-human body". Enter the human body, so the harm of soil heavy metal pollution cannot be underestimated. According to statistics, in 1980, the area of ​​cultivated land polluted by the three industrial wastes in my country was 2.667 million hectares, which increased to 10 million hectares in 1992. At present, as many as 12 million tons of grain are polluted by heavy metals in the country every year, and the direct loss is at least 20 billion yuan. In my country's severe soil pollution areas, the pollution area caused by...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 肖国民丁军露王中豪姜枫薛志君黄兵
Owner SOUTHEAST UNIV
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