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Environmental protection technology for repairing heavy metal chromium polluted soil through biochemical technology

A technology for chromium-contaminated soil and heavy metals, which is applied in the field of biochemistry and achieves the effects of low remediation cost, improved physical and chemical properties, and good ventilation performance.

Inactive Publication Date: 2018-07-06
高源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects in the process of remediating chromium-contaminated soil in the prior art, the present invention provides an environmentally friendly process for remediating heavy metal chromium-contaminated soil using biochemical technology

Method used

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  • Environmental protection technology for repairing heavy metal chromium polluted soil through biochemical technology

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Experimental program
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Effect test

Embodiment 1

[0029] The environmental protection process of utilizing biochemical technology to restore heavy metal chromium-contaminated soil comprises the following steps:

[0030] Mix humic acid, peat soil, sawdust, urea and water according to the mass ratio of 3:2:2:1:5, stir evenly, then raise the temperature to 60°C, keep it warm for 30min, and then add it to the granulator for granulation. Prepare particles with a particle size of 2mm, add the particles to chitosan solution of 2 times the weight, stir at 100rpm for 60min, then let stand for 10min, filter and collect the retentate, and dry at 70°C until the moisture content is 10wt%. Fixed carrier; the preparation method of described chitosan solution is: take 1g chitosan, join in 400ml water, then add 20ml mass fraction is the nitric acid solution of 20%, stir evenly, add water and settle to 1000ml, to obtain final product;

[0031] Arthrobacter crystal-forming ATCC15481, Rhodobacter capsula ATCC11166, Shewanella ATCC700550 and Brev...

Embodiment 2

[0034] The environmental protection process of utilizing biochemical technology to restore heavy metal chromium-contaminated soil comprises the following steps:

[0035] Mix humic acid, peat soil, sawdust, urea and water according to the mass ratio of 3:2:2:1:5, stir evenly, then raise the temperature to 60°C, keep it warm for 30min, and then add it to the granulator for granulation. To obtain particles with a particle size of 1-3mm, add the particles to a chitosan solution of 3 times the weight, stir at 100rpm for 60min, then let stand for 20min, filter and collect the retentate, and dry at 70°C until the moisture content is 10wt%. Promptly get fixed carrier; the preparation method of described chitosan solution is: take by weighing 1g chitosan, join in 400ml water, then add 20ml mass fraction and be the nitric acid solution of 20%, stir evenly, add water and settle to 1000ml, namely have to;

[0036] Arthrobacter crystal-forming ATCC15481, Rhodobacter capsula ATCC11166, She...

Embodiment 3

[0039] Remediation test of chromium-contaminated soil:

[0040] Sample selection: soil samples containing 30, 60, and 120 mg / kg of hexavalent chromium;

[0041] Groups: the experimental group is the Example 1 group; the control group 1 (do not add Arthrobacter crystals, others are the same as in Example 1), the control group 2 (do not add Capsulated Rhodobacter, the others are the same as in Example 1), and the control group 3 (without adding Shewanella, others are the same as in Example 1), control group 4 (without adding Brevibacterium citrinus, others are the same as in Example 1);

[0042] Operation process: Sampling the treated soil of each group, drying to the moisture content of the soil sample before treatment, and measuring the content of hexavalent chromium. The specific results are shown in Table 1:

[0043] Table 1

[0044] Hexavalent chromium concentration

[0045] It can be seen from the above table 1 that the four strains selected in the biochemical pr...

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Abstract

The invention belongs to the technical field of biochemistry, and discloses an environmental protection technology for repairing metal chromium polluted soil through the biochemical technology. The technology comprises the following steps that 1, chromium polluted soil with the thickness of 30-40 cm is used as a to-be-repaired layer, the soil in the to-be-repaired layer is sufficiently turned overto be repaired, and impurities in the soil are removed; biochemical preparations are taken out and placed at the temperature of 30 DEG C to be activated for 12 h, the biochemical preparations are evenly sown, overturning is carried out, uniform mixing is carried out, water filling is carried out till reaching saturation, and biochemical repairing time is 5 days or long. The repair method is easyto operate, low in repair cost, environmentally friendly, free of pollution, capable of being applied to soil polluted by different concentrations of chromium, and wide in application prospect.

Description

technical field [0001] The invention belongs to the field of biochemical technology, and in particular relates to an environment-friendly technology for repairing soil polluted by heavy metal chromium by using biochemical technology. Background technique [0002] Chromium is a kind of heavy metal and is a non-essential element for the human body. It can affect various systems and organs such as nerves, hematopoiesis, reproduction and development, endocrine, immunity, and bones. The average annual emission of about 5 million tons of chromium in the world, most of which enters the soil, leads to different degrees of chromium pollution in the soil of various countries in the world. With the development of industry and agriculture and the wide application of chromium-containing chemicals, a large amount of chromium-containing pollutants enter the soil environment in the process of chromium mining, electroplating metallurgy, waste treatment and disposal, etc., resulting in widesp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C1/10B09C2101/00
Inventor 高源高军崔萍
Owner 高源
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