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

14 Cites 9 Cited by

AI-Extracted 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 remediat...

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.

Application Domain

Contaminated soil reclamation

Technology Topic

NutrientContaminated soils +11

Examples

Experimental program(3)
Comparison scheme(4)
Effect test(1)

Example Embodiment

[0043] Example 1

[0044] This embodiment adopts a method for remediation of heavy metal contaminated soil. The remediation method includes the following steps:

[0045] (1) Add a soil amendment to heavy metal contaminated soil, mix evenly and keep for 10 days; the addition amount of the soil amendment is 13g/m 2.

[0046] (2) Add the microbial inoculum to the soil of step (1), mix evenly, and keep it for 3 days; the added amount of the microbial inoculum is 4g/m 2.

[0047] (3) Plant Bidens in the soil of step (2), plant the seedlings of Bidens in the soil with a row spacing of 34cm and a plant spacing of 26cm; the planting time is March, and the planting cycle is 1 year. , After one year of growth, remove the above-ground parts;

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

[0049] In terms of parts by mass, the soil conditioner includes: 20 parts of rice husk powder, 5 parts of calcium lignosulfonate, 8 parts of vermiculite, 15 parts of bentonite, 20 parts of cassava residue and 10 parts of plant ash; The average particle size is 50 mesh; the preparation method of the soil conditioner is: mixing the rice husk powder, calcium lignosulfonate, vermiculite, bentonite, cassava residue and plant ash to obtain the soil conditioner.

Example Embodiment

[0050] Example 2

[0051] This embodiment adopts a method for remediation of heavy metal contaminated soil. The remediation method includes the following steps:

[0052] (1) Add soil amendment to heavy metal contaminated soil, mix evenly and keep for 13 days; the addition amount of said soil amendment is 15g/m 2.

[0053] (2) Add the microbial inoculum to the soil of step (1), mix evenly and keep for 4 days; the added amount of the microbial inoculum is 5g/m 2.

[0054] (3) Plant Bidens in the soil of step (2), plant the seedlings of Bidens in the soil with a row spacing of 33cm and a plant spacing of 24cm; the planting time is March, and the planting cycle is 1 year. , After one year of growth, remove the above-ground parts;

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

[0056] In parts by mass, the soil conditioner includes: 25 parts of rice husk powder, 8 parts of sodium lignosulfonate, 9 parts of vermiculite, 18 parts of bentonite, 25 parts of cassava residue and 13 parts of plant ash; The average particle size is 50 meshes; the preparation method of the soil conditioner is: mixing the rice husk powder, sodium lignosulfonate, vermiculite, bentonite, cassava residue and plant ash to obtain the soil conditioner.

Example Embodiment

[0057] Example 3

[0058] This embodiment adopts a method for remediation of heavy metal contaminated soil. The remediation method includes the following steps:

[0059] (1) Add a soil amendment to heavy metal contaminated soil, mix evenly, and keep for 15 days; the added amount of the soil amendment is 18g/m 2.

[0060] (2) Add the microbial inoculum to the soil of step (1), mix it evenly, and keep it for 5 days; the added amount of the microbial inoculum is 6g/m 2.

[0061] (3) Plant Bidens in the soil of step (2), plant the seedlings of Bidens in the soil with a row spacing of 31cm and a plant spacing of 22cm; the planting time is March, and the planting cycle is 1 year , After one year of growth, remove the above-ground parts;

[0062] Wherein, the microbial agents include: Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the 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 sodium lignosulfonate, 10 parts of vermiculite, 20 parts of bentonite, 30 parts of cassava residue and 15 parts of plant ash; The average particle size is 50 meshes; the preparation method of the soil conditioner is: mixing the rice husk powder, sodium lignosulfonate, vermiculite, bentonite, cassava residue and plant ash to obtain the soil conditioner.

PUM

Property	Measurement	Unit
The average particle size	40.0 ~ 60.0	mesh
The average particle size	50.0	mesh

Description & Claims & Application Information

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Remediation method of heavy metal contaminated soil

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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