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In-situ ecological remediation method for compound contaminated soil by using biological and carbonized materials

A composite pollution and ecological restoration technology, applied in the field of landscaping and environmental pollution restoration, can solve the problems of long-term, low efficiency of composite polluted soil, poor effect of composite soil pollution restoration, etc., and achieve rapid restoration of vegetation and improvement of urban ecological environment. Effect

Active Publication Date: 2018-12-28
SHANGHAI ACADEMY OF LANDSCAPE ARCHITECTURE SCI & PLANNING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the efficiency of single phytoremediation for compound polluted soil is relatively low, and it takes a long time to achieve the purpose of remediation, and the remediation effect for compound soil pollution is poor

Method used

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  • In-situ ecological remediation method for compound contaminated soil by using biological and carbonized materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The in-situ ecological restoration method for controlling compound polluted soil comprises the following steps:

[0025] (1) Add biochar and inorganic improvement materials to the contaminated soil to be repaired, and mix and stir evenly; the biochar is a mixture of rapeseed and corn crop stalks calcined at 500 ° C to obtain particles with a particle size of less than 5 μm. The inorganic modified material described above is CoMoS 4 、Cu 2 MoS 4 With a mixture of mass ratio of 1:1, the mass ratio of biochar and inorganic improvement material is 1:0.3; the amount of biochar and inorganic improvement material is 0.5kg / square.

[0026] (2) A layer of greening planting soil is covered on the polluted soil layer, and the polluted soil layer needs to be compacted and vibrated, and the layer height is 40cm; the polluted soil layer is drained by inserting water pipes every 80cm horizontally.

[0027] (3) Carry out landscape plant community configuration according to landscape ...

Embodiment 2

[0029] The in-situ ecological restoration method for controlling compound polluted soil comprises the following steps:

[0030] (1) Add biochar and inorganic improvement materials to the polluted soil to be repaired, and mix and stir evenly; the biochar is obtained after drying the sludge in the lotus root pond and calcining at 580°C with a particle size of less than 3.5 μm , the inorganic modification material is NiMoS 4 、Cu 2 MoS 4 With a mixture of mass ratio 1:0.8, the mass ratio of biochar and inorganic improvement material is 1:0.6; the amount of biochar and inorganic improvement material is 0.35kg / square, and the mixed bacteria of Pseudomonas and Bacillus subtilis are added at the same time agent, the added amount of mixed bacteria agent is 0.15% of the total mass of biochar and inorganic improvement materials, and the concentration of Pseudomonas is 5×10 4 cfu / ml, the concentration of Bacillus subtilis is 5×10 4 cfu / ml.

[0031] (2) A layer of greening planting so...

Embodiment 3

[0035] The in-situ ecological restoration method for controlling compound polluted soil comprises the following steps:

[0036] (1) Add biochar and inorganic improvement materials to the contaminated soil to be repaired, and mix and stir evenly; the biochar is the particles with a particle size of less than 3.5 μm after drying the sludge in fish ponds and calcining at 580°C , the inorganic modification material is Cu 2 MoS 4 , Zn 2 MoS 4 With a mixture of mass ratio 1:0.5, the mass ratio of biochar and inorganic improvement material is 1:0.8; the amount of biochar and inorganic improvement material is 0.65kg / square, and AM mycorrhizal fungus is added at the same time, and the addition of AM mycorrhizal fungus The amount is 50g / square.

[0037] (2) A layer of greening planting soil is covered on the polluted soil layer, and the polluted soil layer needs to be compacted and vibrated, and the layer height is 50 cm; the polluted soil layer is drained by inserting water pipes eve...

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Abstract

The invention provides an in-situ ecological remediation method for treating compound contaminated soil. The in-situ ecological remediation method comprises the steps that biochar and inorganic improved materials are added into the to-be-remedied contaminated soil, and even mixing is conducted; a contaminated soil layer is covered with a layer of green planting soil; a landscape plant community isconfigured according to landscape demands, and artificial rainfall is simulated once every 25-35 days, and the standard is that the to-be-remedied contaminated soil layer is soaked. The biochar is aproduct obtained by calcining one or more of crop straws, dead litter and river bottom sludge at 500-600 DEG C. The inorganic improving materials include any one or more of CoMoS4, NiMoS4, Cu2MoS4, and Zn2MoS4. After the in-situ ecological remediation method for treating the compound contaminated soil is adopted for two years, the removal rate of Cu is 15-25%, the removal rate of Zn is 20-28%, theremoval rate of Pb is 10-22%, and the removal rate of Cd is 8-17%.

Description

technical field [0001] The invention belongs to the field of landscaping and environmental pollution restoration, and relates to an in-situ restoration method for composite pollution, specifically a method for carrying out in-situ plant restoration and landscape reconstruction of soil heavy metal pollution by using plants, microorganisms and carbonized porous recycling materials . Background technique [0002] Phytoremediation refers to the process in which plants and soil microorganisms work together to transform pollutants into harmless or usable forms. At the same time, the effect of site landscape reconstruction can be achieved through the application and preparation of different types of plants. At present, the efficiency of single phytoremediation for complex polluted soil is relatively low, and it takes a long time to achieve the purpose of remediation, and the remediation effect for complex soil pollution is poor. Contents of the invention [0003] The present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 张浪郑思俊梁晶李跃忠张冬梅韩继刚富婷婷杨博
Owner SHANGHAI ACADEMY OF LANDSCAPE ARCHITECTURE SCI & PLANNING