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Method for repairing chromium-contaminated soil through biochar-loaded hematite-shewanella loihica complex

A technology of photovoltaic Shewanella and biochar, applied in the field of soil remediation, can solve the problems of long repair time, difficult repair, slow water seepage, etc., and achieve the effect of shortening repair time, efficient repair effect, and accelerated transformation

Active Publication Date: 2021-07-02
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The microbial remediation method has the advantages of low cost, easy operation, and no secondary pollution, but the high concentration of Cr(VI) has disadvantages such as poor microbial effect and long remediation time.
At the same time, for different types of Cr(VI)-contaminated soils, microbial remediation effects are different, especially for clayey soils. Due to its slow water seepage, poor aeration performance, and poor mass transfer effect, Cr(VI)-contaminated clayey soils are relatively poor. Sandy and loamy soils are not easy to repair
[0007] At present, there is no report on the microbial remediation method for rapid and efficient reduction of soil hexavalent chromium by using biochar-loaded iron oxides as carriers and electron acceptors under the action of the dissimilatory iron-reducing bacteria Shewanella loihica

Method used

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  • Method for repairing chromium-contaminated soil through biochar-loaded hematite-shewanella loihica complex
  • Method for repairing chromium-contaminated soil through biochar-loaded hematite-shewanella loihica complex
  • Method for repairing chromium-contaminated soil through biochar-loaded hematite-shewanella loihica complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Obtain background soil samples with a depth of 20-100cm from a chromium-contaminated site, air-dry and sieve (60 mesh), measure soil properties, add potassium dichromate solutions of different concentrations, and naturally age for 2 months to obtain different pollution concentrations Table 1 shows the physical and chemical properties of soil contaminated with hexavalent chromium.

[0025] The Shewanella photovoltaics used in this example is Shewanella loihica, which was purchased from the Marine Microorganism Culture Collection (MCCC) with the number 1A13940. The yeast extract used, also known as yeast powder, was purchased from Oxoid with the item number LP0021. The biochar used was commercially purchased pine needle biochar with a pyrolysis temperature of 1000 °C.

[0026] BC@α-Fe 2 o 3 Preparation of @loihica complex: Weigh 25.25g, 12.625g, 5.05g, 2.525g and 1.2625g of Fe(NO 3 ) 3 9H 2 O into a 150mL beaker, add 60mL of ammonia water with an ammonia content of ...

Embodiment 2

[0035] Preparation of the complex: weigh 2.525gFe(NO 3 ) 3 9H 2 O into a 150mL beaker, add 60mL of ammonia water with an ammonia content of 9%, and add 5g of biochar into the beaker, stir magnetically for 30min, transfer to a 100mL hydrothermal reaction kettle, perform hydrothermal synthesis in an oven at 120°C for 15 hours, dry and grind to obtain Biochar and α-Fe 2 o 3 BC@α-Fe with a mass ratio of 10:1 2 o 3 . Add 25mL of Shewanella photovoltaica bacteria liquid to 75mL of LB medium (tryptone 10g / L, sodium chloride 10g / L, yeast extract 5g / L, the rest is water, pH value 7.0), and 5g BC @α-Fe 2 o 3 Add it into the culture medium and culture it in a constant temperature shaking incubator at 30°C and 180rpm for 24 hours to obtain BC@α-Fe 2 o 3 @loihica complex.

[0036] Remediation of hexavalent chromium-contaminated soil: The test was divided into seven groups: A, B, C, D, E, F, and G. Group A added only Shewanella photovoltaic bacteria solution, Group B added biocha...

Embodiment 3

[0042] Preparation of the complex: the preparation method of the complex in this example is the same as that in Example 1.

[0043] Restoration of soil contaminated with hexavalent chromium at different concentrations: the test is divided into five groups A, B, C, D, and E, using soils numbered 1 to 5 respectively, and other test conditions are the same as those of group F in Example 2. The soil total hexavalent chromium concentration was measured, and the test results obtained are shown in Table 3.

[0044] Table 3 Remediation effect of different concentrations of Cr(VI) contaminated soil

[0045]

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Abstract

The invention discloses a method for repairing chromium-contaminated soil through a biochar-loaded hematite-shewanella loihica complex. Hematite is loaded on biochar by a hydrothermal method, then the hematite and shewanella loihica form a BC@ alpha-Fe2O3 @ loihiica complex, and fulvic acid is added as an electron shuttle, so that the chromium-contaminated soil is repaired. The ratio of the charcoal to the hematite is 10: 1; the proportion of the biochar loaded hematite in the complex is 0.05 g / mL (complex); and the repairing process is carried out under an anaerobic condition, the repairing time is 5 days, and the temperature is 30 + / -2 DEG C. The biochar-loaded hematite-shewanella loihica complex has a good remediation effect on soil polluted by hexavalent chromium with different concentrations, the remediation time is short, the biochar-loaded hematite-shewanella loihica complex can be used for remediation of soil polluted by high-concentration hexavalent chromium, and an efficient and rapid method is provided for clay polluted by high-concentration hexavalent chromium which is difficult to remedy.

Description

technical field [0001] The invention relates to the field of soil remediation. More specifically, it relates to a method for remediating chromium-contaminated soil with a biochar-loaded hematite-shewanella photovoltaic complex. Background technique [0002] With the rapid advancement of industrialization and urbanization, soil pollution in my country has become increasingly serious. According to statistics, the area of ​​polluted cultivated land in the country is about 150 million mu, accounting for more than 20% of the total cultivated land area. According to the 2014 National Soil Pollution Survey Bulletin, the country's soil exceeded the standard rate of 16.1%, the pollution type is mainly inorganic, and the overall national soil environment is not optimistic. [0003] Chromium and its compounds are widely used in industries such as iron and steel, electroplating, and tanning, and become one of the main pollutants of heavy metal pollution in soil, which is harmful to hum...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10B09C1/08
CPCB09C1/00B09C1/10B09C1/08
Inventor 邹德勋冯晨昱王阳郑旭升明晓贺门志伟刘研萍
Owner BEIJING UNIV OF CHEM TECH
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