Method for remediating heavy metal contaminated soil through modified nanoscale zero-valent iron reinforced plants

A nano-zero-valent iron and polluted soil technology, applied in the restoration of polluted soil, etc., can solve the problems of low treatment efficiency, low plant absorption, long growth cycle, etc., and achieve good treatment effect, high treatment efficiency, and growth fast effect

Inactive Publication Date: 2017-07-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing research, phytoremediation has problems such as slow growth rate, long growth cycle, and is greatly affected by climate, soil fertility, moisture, salinity, pH, etc. Relying solely on phytoremediation of polluted soil has the potential of phytoremediation. The problem of low absorption and low processing efficiency

Method used

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  • Method for remediating heavy metal contaminated soil through modified nanoscale zero-valent iron reinforced plants
  • Method for remediating heavy metal contaminated soil through modified nanoscale zero-valent iron reinforced plants
  • Method for remediating heavy metal contaminated soil through modified nanoscale zero-valent iron reinforced plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Investigate the effect of different additions of modified nano-zero-valent iron on plant growth

[0031] The method for enhancing phytoremediation of heavy metal-contaminated soil by using modified nano-zero-valent iron of the present invention includes the following steps: first adding starch-modified nano-zero-valent iron into air-dried Pb-contaminated soil and mixing, and then mixing the resulting Pb Plant seeds that have been germinated in the contaminated soil. When the plant seeds are grown to maturity, remove the whole plant from the Pb-contaminated soil for the following tests. The invention strengthens the extraction of heavy metals from the soil by the modified nano-zero-valent iron, and strengthens the plant root system to stabilize harmful heavy metals to reduce the harm of heavy metals in the soil and complete the restoration of heavy metal contaminated soil.

[0032] Specific experimental plan: Design six treatment groups, that is, add different amou...

Embodiment 2

[0038] Example 2: To investigate the effect of low-concentration starch modified nano-zero-valent iron S-nZVI (100-500mg / kg) on ​​strengthening phytoremediation of lead-contaminated soil

[0039] Experimental method: Place ryegrass in a constant temperature and humidity incubator for 48 hours, the temperature is 37°C, and the humidity is 70%. Weigh 1 kg of air-dried soil for each pot, weigh 100, 200, and 500 mg of the prepared modified nano-zero-valent iron into the air-dried soil, and mix them evenly. The ryegrass seeds with full grains and not sinking were selected and sown evenly in each treatment pot, the seeding concentration was 5g / kg, and they were numbered as A, B, and C respectively. According to the lack of water in the soil, water regularly to keep the soil moisture content at 75-80% of the field water holding capacity. The experiment was carried out for 45 days (to the mature period) after sampling and analysis.

[0040] Take 0.5g of soil sample after harvesting plant...

Embodiment 3

[0049] Example 3: Investigate the effect of high-concentration starch modified nano-zero-valent iron S-nZVI (1000, 2000 mg / kg) on ​​strengthening phytoremediation of lead-contaminated soil

[0050] Experimental method: Place ryegrass in a constant temperature and humidity incubator for 48 hours, the temperature is 37°C, and the humidity is 70%. Weigh 1 kg of air-dried soil for each pot, weigh 1000 and 2000 mg of the prepared modified nano zero-valent iron into the air-dried soil, and mix them evenly. The ryegrass seeds with full grains and not sinking were selected and sown in each treatment pot. The seeding concentration of the seeds was 5g / kg, and they were recorded as D and E respectively. According to the lack of water in the soil, water regularly to keep the soil moisture content at 75-80% of the field water holding capacity. The experiment was carried out for 45 days (to the mature period) after sampling and analysis.

[0051] Take 0.5g of soil sample after harvesting plant...

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Abstract

The invention discloses a method for remediating heavy metal contaminated soil through modified nanoscale zero-valent iron reinforced plants. The method comprises the following steps that firstly, starch modified nanoscale zero-valent iron is added into the air-dried heavy metal contaminated soil to be mixed evenly, and the concentration of the modified nanoscale zero-valent iron is optimized to be 100 mg/kg-2000 mg/kg; and then plant seeds obtained after germination accelerating are sown in the obtained heavy metal contaminated soil, and when the plant seeds are cultivated to the mature period, the plants are removed from the heavy metal contaminated soil overall. According to the heavy metal contaminated soil, heavy metal in the soil is extracted by the modified nanoscale zero-valent iron reinforced plants, the root system of the reinforced plants stabilize the harmful heavy metal, the harm of the heavy metal in the soil is lowered, and remediation of the heavy metal contaminated soil is completed. Through the method, the physicochemical characteristic of the soil can be improved, plant remediation of the heavy metal contaminated soil is facilitated, the method is simple and easy to operate and free of toxic action to the environment and has very good economic value and ecological benefits.

Description

Technical field [0001] The invention relates to an ecological restoration technology for heavy metal polluted soil environment, in particular to a method for strengthening phytoremediation of heavy metal polluted soil by using modified nano zero-valent iron. Background technique [0002] Soil heavy metal pollution refers to the high content of trace metal elements in the soil that exceed the background value due to human activities, and the excessive deposits cause excessive content, collectively referred to as soil heavy metal pollution. In the past 200 years, with the progress of human civilization, humans have discharged a huge amount of heavy metal pollutants into the natural ecosystem, and a large number of untreated pollutants are directly discharged into water bodies and soil. Among them, soil heavy metal pollution mainly comes from the discharge of industrial wastes, lead pollution mainly comes from smelting emissions and automobile exhaust emissions, the use of pesticide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/08B09C1/105B09C2101/00
Inventor 黄丹莲秦香刘云国曾光明龚小敏薛文静王茜胡正勋胡婵娟
Owner HUNAN UNIV
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