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Arsenic-contaminated soil repairing and retaining agent based on microbe catalytic synthesis, and preparation and application thereof

A soil remediation and arsenic-contaminated technology, which is applied in the field of arsenic-contaminated soil remediation, can solve the problems of low cost of bioremediation, easily damaged soil structure, secondary pollution of fixatives, etc., to reduce mobility and bioavailability, Strong chemical stability, easy to reproduce and reproduce

Inactive Publication Date: 2014-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching method is costly, easy to cause secondary pollution, and easy to damage the soil structure; the bioremediation method has low treatment costs, but the required repair period is long, and the type of pollution is greatly restricted
The fixation method can reduce the mobility and bioavailability of arsenic, but some fixatives themselves have secondary pollution, and many existing fixatives have no obvious effect on the treatment of arsenic-contaminated soil

Method used

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  • Arsenic-contaminated soil repairing and retaining agent based on microbe catalytic synthesis, and preparation and application thereof
  • Arsenic-contaminated soil repairing and retaining agent based on microbe catalytic synthesis, and preparation and application thereof
  • Arsenic-contaminated soil repairing and retaining agent based on microbe catalytic synthesis, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Formulated with FeSO 4 500 mL of a solution with a concentration of 25 g / L and a pH of 3.74 was sterilized by filtration with a 0.22-micron pore size filter, and then inoculated with a suspension of Acidithiobacillus ferrooxidans (suspended in distilled water) to make the number of bacteria reach 5× 10 7 cells / ml, cultured with shaking for 3 days, and the precipitate was collected by filtration. Rinse the precipitate with distilled water, add sulfuric acid acidified distilled water with pH=4, shake and mature for 24h, collect the precipitate by filtration, rinse with distilled water for 3 times, add it to NaOH solution with pH=7.5, shake for 24h, collect the precipitate, put it in Dry in an oven at 50°C to obtain a fixative.

[0035] Weigh 100 g of arsenic-contaminated soil in Shimen County, Hunan Province, add 5 g of the above fixative, add tap water according to the soil-water mass ratio of 5:2, and mix evenly. Samples were taken after one week of treatment to dete...

Embodiment 2

[0037] Formulated with FeSO 4 500mL of a solution with a concentration of 20g / L and a pH of 3.83 was filtered and sterilized with a filter membrane with a pore size of 0.22 microns, and then inoculated with a suspension of Thiobacillus ferrooxidans (suspended in distilled water) to make the number of bacteria reach 5×10 8 cells / ml, cultured with shaking for 3 days, and the precipitate was collected by filtration. Rinse the precipitate with distilled water, add sulfuric acid acidified distilled water with pH=3, shake and ripen for 24h, collect the precipitate by filtration, rinse with distilled water 3 times, add it to NaOH solution with pH=8.0, shake for 24h, collect the precipitate, put it in Dry in an oven at 50°C to obtain a fixative.

[0038] Weigh 100 g of arsenic-contaminated soil in Shimen County, Hunan Province, add 5 g of the above fixative, add tap water according to the soil-water mass ratio of 2:1, and mix evenly. Samples were taken after one week of treatment to...

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Abstract

The invention discloses an arsenic-contaminated soil repairing and retaining agent based on microbe catalytic synthesis, and a preparation and application method thereof. Currently, lots of fixing agents for repairing arsenic-contaminated soil can cause soil acidification and seriously destroy the soil property. Aiming at the problems, the fixing agent for repairing arsenic-contaminated soil is prepared from ferrous sulfate serving as raw material by steps of catalytically oxidizing thiobacillus ferrooxidans, collecting a precipitated product and performing aging modification to the precipitated product. The synthesized product is uniformly mixed with soil according to a certain proportion, the water-soluble arsenic in the contaminated soil is reduced by 99.8 percent, the effective-state arsenic is reduced by 75.4 percent, and the pH value of repaired soil is about 7. The fixing agent is simple in preparation process and low in cost, can be used for effectively reducing the mobility of arsenic and bio-availability in the soil, and hardly affects the pH value of soil. The repaired soil is good for crop growth.

Description

technical field [0001] The invention relates to the technical field of arsenic-contaminated soil remediation, in particular to a fixative product suitable for arsenic-contaminated soil remediation, a preparation method and application thereof in arsenic-contaminated soil remediation. Background technique [0002] The mining and smelting of arsenic compounds, especially the local arsenic smelting widely spread in my country in the past, has caused continuous pollution of arsenic to the environment; in the development and smelting of certain non-ferrous metals, the discharge of arsenic compounds has polluted the surrounding environment ; Extensive use of arsenic compounds, such as the production and use of arsenic-containing pesticides, will lead to varying degrees of arsenic pollution. Soil arsenic pollution will directly lead to the decline of the quality of biological products. In many places, the arsenic content in food, vegetables, fruits and other foods exceeds the standa...

Claims

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Application Information

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IPC IPC(8): C09K17/00B09C1/10C09K101/00
Inventor 杨志辉柴立元廖映平闵小波刘琳
Owner CENT SOUTH UNIV
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