Heavy metal polluted soil composite repair agent and soil repair method thereof

A technology of complex restoration of polluted soil, applied in the field of soil restoration, can solve the problems of single biochar ash content, carbon content is not the same, only applicable, etc., to achieve the goal of reducing ecological risk, improving activity, and reducing the content of bioavailable state Effect

Inactive Publication Date: 2019-04-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, a single biochar is generally used, and a single biochar is generally only suitable for a specific contaminated soil due to its different ash content and carbon content, which leads to certain limitations in the remediation of heavy metal pollution in soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Concrete, heavy metal polluted soil composite remediation agent, it is prepared by the following method:

[0029] A. Preparation of sludge biochar: After the sludge is heated under high temperature and vacuum, it is washed and dried to obtain sludge biochar;

[0030] B. Preparation of agricultural and forestry waste biochar: corn stalks are heated under high temperature and vacuum, washed and dried to obtain agricultural and forestry waste biochar;

[0031] C, mixing the sludge biochar obtained in step A with the agricultural and forestry waste biochar obtained in step B to obtain mixed biochar;

[0032] D. Mixing and reacting the mixed biochar obtained in step C with sodium citrate solution, after the reaction is completed, washing and drying to obtain a composite restoration agent for heavy metal polluted soil.

[0033] Due to its different ash content and carbon content, single biochar is generally only suitable for a specific contaminated soil, which has certain li...

Embodiment 1

[0047] Take the dewatered sludge from a certain urban sewage treatment plant, dry it in the sun until the water content does not exceed 15wt%, crush it with a pulverizer to obtain a powdery material, sieve the material with a 50-mesh standard sampling sieve, and remove the lower layer to seal The bag is ready for use; put the sludge powder in a muffle furnace for high-temperature vacuum heating, the heating time is 2 hours, and the heating temperature is 300°C. After the reaction, rinse with deionized water twice, dry at 105°C to constant weight, After the target standard sample sieve sieves the material, the under-sieve is the sludge biochar;

[0048] Take fresh corn stalks, soak them in clean water to wash off the surface sediment, and cut them into an area of ​​about 1cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water, dried at 105°C to constant weight, sieved with a 50-mesh standard sampling sieve and sealed fo...

Embodiment 2

[0052] Take the dewatered sludge from a certain urban sewage treatment plant, dry it in the sun until the water content does not exceed 15%, crush it with a pulverizer to obtain a powdery material, sieve the material with a 50-mesh standard sampling sieve, and remove the lower layer to seal The bag is ready for use; put the sludge powder in a muffle furnace for high-temperature vacuum heating, the heating time is 3 hours, and the heating temperature is 450°C. After the reaction, rinse twice with deionized water, dry at 105°C to constant weight, After the target standard sample sieve sieves the material, the under-sieve is the sludge biochar;

[0053] Take fresh corn stalks, soak them in clean water to wash off the surface sediment, and cut them into an area of ​​about 1cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water, dried at 105°C to constant weight, sieved with a 50-mesh standard sampling sieve and sealed for ...

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Abstract

The invention discloses a heavy metal polluted soil composite repair agent and a soil repair method thereof, and belongs to the technical field of soil repairing. The invention provides the heavy metal polluted soil composite repair agent. The heavy metal polluted soil composite repair agent is prepared by the following method: heating sludge in high-temperature vacuum, and washing and drying thesludge to obtain sludge biochar; heating forestry and agricultural residues in high-temperature vacuum, and washing and drying the forestry and agricultural residues to obtain forestry and agricultural residue biochar; mixing the sludge biochar with the forestry and agricultural residue biochar; and mixing the mixed biochar with a sodium citrate solution, performing oscillating reaction, and washing and drying the solution at the end of the reaction to obtain the heavy metal polluted soil composite repair agent. According to the heavy metal polluted soil composite repair agent and the soil repair method thereof, the sludge and the forestry and agricultural residues are used as the raw materials; the two biochars are mixed in different proportions, so that the ash content and the carbon content of the composite adsorbent are increased; and by use of the sodium citrate solution for modification, the activity of the biochar is improved, so that the content of heavy metal elements in a biological use state in the soil is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a heavy metal polluted soil remediation agent and a soil remediation method thereof. Background technique [0002] Soil is the material basis for the survival of humans, animals, plants, microorganisms and all living organisms, and is closely related to human life and other aspects. Soil heavy metal pollution comes from a wide range of sources. Sewage irrigation, atmospheric deposition, solid waste landfill seepage, pesticide and fertilizer application, metal mining and smelting, etc., will cause the problem of soil heavy metal pollution to become increasingly serious. Heavy metal pollutants can accumulate in the soil for a long time, causing serious harm to the soil ecosystem and groundwater, and can enter the food chain through plants, seriously threatening human health. [0003] At present, the main principles of remediation of heavy metal pollution in so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 陈婷彭穗韩慧果杨晓
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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