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Remediation method of heavy metal contaminated soil

A remediation method and a technology of polluted soil, which is applied in the field of remediation of contaminated soil, can solve the problems of unsatisfactory remediation effect in the research stage, and achieve the effects of favorable growth, good remediation effect, and improvement of porosity and nutritional status

Inactive Publication Date: 2019-01-18
崔维佳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many methods for remediation of heavy metal-contaminated soil are still in the research stage, or there are problems with unsatisfactory remediation effects. Therefore, it is necessary to provide a remediation method for heavy metal-contaminated soil to solve the remediation problem of heavy metal soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment adopts a kind of repairing method of heavy metal contaminated soil, and this repairing method comprises the following steps:

[0045] (1) Add soil improver to heavy metal contaminated soil, mix well, keep 10d; the addition of said soil improver is 13g / m 2 .

[0046] (2) Add microbial inoculum to the soil of step (1), mix evenly, keep 3d; The addition of described microbial inoculum is 4g / m 2 .

[0047] (3) Plant ghost needle grass in the soil of step (2), plant the seedlings of ghost needle grass in the soil, the row spacing of planting is 34cm, the plant spacing is 26cm; the planting time is March, with 1 year as a planting cycle , after one year of growth, remove the aboveground part;

[0048] Wherein, the microbial agent includes: Trichoderma harzianum and Bacillus subtilis, the mass ratio of Trichoderma harzianum and Bacillus subtilis is 1:0.5;

[0049] In parts by mass, the soil conditioner includes: 20 parts of rice husk powder, 5 parts of calc...

Embodiment 2

[0051] This embodiment adopts a kind of repairing method of heavy metal contaminated soil, and this repairing method comprises the following steps:

[0052] (1) Add soil improver to heavy metal contaminated soil, mix well, keep 13d; the addition of said soil improver is 15g / m 2 .

[0053] (2) Add microbial inoculum to the soil of step (1), mix uniformly, keep 4d; The addition of described microbial inoculum is 5g / m 2 .

[0054] (3) Plant ghost needle grass in the soil of step (2), plant the seedlings of ghost needle grass in the soil, the row spacing of planting is 33cm, the plant spacing is 24cm; the planting time is March, with 1 year as a planting cycle , after one year of growth, remove the aboveground part;

[0055]Wherein, the microbial agent includes: Trichoderma harzianum and Bacillus subtilis, the mass ratio of Trichoderma harzianum and Bacillus subtilis is 1:0.8;

[0056] In parts by mass, the soil improver includes: 25 parts of rice husk powder, 8 parts of sodiu...

Embodiment 3

[0058] This embodiment adopts a kind of repairing method of heavy metal contaminated soil, and this repairing method comprises the following steps:

[0059] (1) Add soil improver to heavy metal contaminated soil, mix well, keep 15d; the addition of said soil improver is 18g / m 2 .

[0060] (2) Add microbial inoculum to the soil of step (1), mix uniformly, keep 5d; The addition of described microbial inoculum is 6g / m 2 .

[0061] (3) Plant ghost needle grass in the soil of step (2), plant the seedlings of ghost needle grass in the soil, the row spacing of planting is 31cm, the plant spacing is 22cm; the planting time is March, with 1 year as a planting cycle , after one year of growth, remove the aboveground part;

[0062] Wherein, the microbial agent includes: Trichoderma harzianum and Bacillus subtilis, the mass ratio of Trichoderma harzianum and Bacillus subtilis is 1:1;

[0063] In parts by mass, the soil conditioner includes: 30 parts of rice husk powder, 10 parts of so...

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Abstract

The invention discloses a remediation method of heavy metal contaminated soil. The remediation method comprises the following steps that (1) a soil amendment is added into the heavy metal contaminatedsoil and mixed evenly, and the soil remains for 10-15 days; (2) a microbial agent is added into the soil in the step (1) and mixed evenly, and the soil remains for 3-5 days, and (3) bidens pilosa isplanted in the soil in the step (2), after the bidens pilosa absorbs heavy metals, the overground parts of the bidens pilosa are removed, wherein the microbial agent comprises trichoderma and bacillussubtilis with the mass ratio of the trichoderma to the bacillus subtilis being 1 to (0.5-1). The microbial agent is added into the contaminated soil with the soil amendment, so that the better improvement effect of the soil amendment is facilitated; and meanwhile, the toxicity of the heavy metals in the soil is relieved, the supply of nutrients to heavy metal hyperaccumulators is improved and accordingly the remediation efficiency of the hyperaccumulators is improved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and more specifically relates to a method for remediating heavy metal-contaminated soil. Background technique [0002] Among the soil inorganic pollutants, heavy metals are more prominent, mainly because heavy metals cannot be decomposed by soil microorganisms, but are easy to accumulate and transform into more toxic methyl compounds, and some even accumulate in the human body at harmful concentrations through the food chain, seriously endangering human health. [0003] Soil heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Although arsenic does not belong to heavy metals, it is usually included in it because of its behavior, source and hazards are similar to heavy metals. Heavy metals are discussed. The same metal has different forms in the soil, and its migration and transformation characteristics...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/10B09C1/105
Inventor 崔维佳
Owner 崔维佳
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