Preparation and application for heavy metal chromium contaminated soil remediation material

A granular and biochar technology, which is applied in the restoration of polluted soil, soil conditioning materials, applications, etc., can solve the problem of poor flow performance and stability of materials, unfavorable soil reuse and plant regrowth, and reduce the effect of materials on chromium repair, etc. problems, to achieve the effects of good stability and fluidity, easy promotion and use, and convenient operation

Active Publication Date: 2015-11-04
师大清远环境修复科技有限公司
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AI Technical Summary

Problems solved by technology

In recent years, due to the advantages of small particle size, large specific surface area, high surface activity, and strong reducing ability, nano-zero-valent iron has been widely used in the remediation of heavy metal chromium pollution in soil, and significant progress has been made, but there are still There are many challenging problems. For example, due to the magnetic properties of nano-zero-valent iron particles, they are easy to agglomerate into larger particles, and the fluidity and stability of the material are poor. When repairing in situ, the repair effect of the material on chromium will be reduced; Zero-valent iron remediation of chromium-contaminated soil will change the soil structure during the remediation process, and the release of some iron ions will cause secondary pollution, which is not conducive to the reuse of soil and the regrowth of plants

Method used

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  • Preparation and application for heavy metal chromium contaminated soil remediation material
  • Preparation and application for heavy metal chromium contaminated soil remediation material
  • Preparation and application for heavy metal chromium contaminated soil remediation material

Examples

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preparation example Construction

[0038] A preparation method of biochar particles, the steps are:

[0039] 1) Wash, dry and crush the agricultural waste to obtain substance A;

[0040] 2) Substance A is deoxidized and carbonized under a protective atmosphere, and the carbonized product is ground and sieved to obtain biochar particles.

[0041] Preferably, the agricultural waste is bagasse.

[0042] Preferably, step 2) is specifically: put substance A into a crucible, place it in a muffle furnace with a protective atmosphere, and raise the temperature of the muffle furnace to 500-700°C at a heating rate of 15-25°C / min to reach the temperature After the interval, keep at this temperature for 1-3 hours to fully deoxidize and carbonize, then cool down to room temperature in the muffle furnace, take out the black residue, grind and sieve to obtain biochar particles;

[0043] More preferably, the number of meshes used for the above-mentioned sieving is 24 mesh to 200 mesh, more preferably, 60 mesh to 120 mesh;

...

Embodiment 1

[0062] Preparation of biochar particles with different particle sizes:

[0063] 1) Wash the bagasse, air-dry it, and cut it into sugarcane pieces of 1cm×1cm×1cm;

[0064] 2) Put the treated sugarcane block into the crucible, then put it in the muffle furnace, under the protection of nitrogen, deoxidize carbonization at the set temperature of 600°C, and continue to Carbonize for 2 hours. After the temperature of the muffle furnace drops to room temperature, take out the black residue, grind it, and sieve it (the mesh size of the sieve is 24 mesh to 200 mesh) to obtain biochar particles with different particle sizes (the particle size is 0.701mm~ 0.074 mm), the biochar particles with better stability were selected through sedimentation experiments.

[0065] figure 1 It is a scanning electron microscope (SEM) picture of the biochar particles prepared in this example;

Embodiment 2

[0067] Preparation of supported nanometer zero-valent iron particles in different proportions:

[0068] 1) Prepare 100ml of 0.1mol / L FeSO with ethanol and water (V:V=3:7) 4 ·7H 2 O solution, stirred at a speed of 400rpm for 10min to dissolve and mix to obtain solution A;

[0069] 2) Add biochar particles with better stability (Example 1) into solution A, stir at a speed of 500rpm for 60min, dissolve and mix well, and obtain solution B;

[0070] 3) Prepare 50ml of 0.3mol / L sodium borohydride solution with ethanol and water (V:V=3:7), quickly add it to solution B under the protection of nitrogen, and continue stirring at a speed of 500rpm React for 30 minutes, then separate nanometer zero valent iron by magnetic separation, wash with deoxygenated water, absolute ethanol and acetone respectively, after each washing twice, vacuum dry at 50°C to 60°C to prepare loaded nanometer zero Valence iron particles.

[0071] 4) According to the above method, prepare biochar-nano-zero-val...

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Abstract

The invention discloses preparation and an application for a heavy metal chromium contaminated soil remediation material. Preparation for biological carbon particles comprises the following steps: 1) cleaning, drying and crushing agriculture waste to obtain a substance A; and 2) placing the substance A under a protective atmosphere to deoxidize and carbonize, and grinding and sieving carbonize products to obtain the biological carbon particles. Preparation for supported type nano zero-valent iron particles comprises the following steps: 1) preparing ferrite into a solution; 2) adding biological carbon particles into the solution, and uniformly mixing the biological carbon particles with the solution; and 3) dissolving a reducing agent into a solvent to obtain a mixture, adding the mixture into the system in the last step under the protective atmosphere, stirring the mixture, sufficiently reacting the mixture, separating nano zero-valent iron, washing, drying and grinding the nano zero-valent iron to obtain the supported type nano zero-valent iron particles. The invention further discloses the application of the supported type nano zero-valent iron particles to remediating chromium contaminated soil in situ. The in-situ remediation method for the heavy metal chromium contaminated soil comprises the following steps: adding the supported type nano zero-valent iron particles into soil, uniformly mixing the supported type nano zero-valent iron particles, adding deoxygenated water, and carrying out remediation. The remediation material prepared by the preparation disclosed by the invention is high in efficiency of remediating the chromium contaminated soil, and capable of improving the soil structure and improving the soil fertility.

Description

technical field [0001] The invention relates to the preparation and application of a heavy metal chromium polluted soil restoration material. Background technique [0002] Soil is one of the main natural resources that human beings depend on for survival, but at present, the soil in my country is seriously polluted by heavy metals. According to statistics, the cultivated land polluted by heavy metals such as cadmium, arsenic, lead, chromium, and mercury in my country accounts for about 10% of the total cultivated land area. / 5; According to the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources on April 17, 2014, the total rate of soil pollution in the country is 16.1%, of which the rate of chromium pollutants is 1.5%. Due to the enrichment, high toxicity and refractory properties of heavy metals, they pose a great threat to the ecological environment and human health, and the restoration of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/04B22F9/24C01B31/02
Inventor 方战强苏慧杰
Owner 师大清远环境修复科技有限公司
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