Restoration agent for chromium-contaminated soil and restoration method thereof

A technology of chromium-contaminated soil and repair method, which is applied in the field of chromium-contaminated soil remediation agent and its remediation, which can solve problems such as easy aggregation and oxidation by air, and achieve the effect of maintaining reactivity, improving activity and improving remediation effect

Inactive Publication Date: 2019-04-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention aims at the problem that nano-iron is easy to agglomerate and oxidized by air when repairing chromium-contaminated soil, and provides a chromium-contaminated soil repairing agent and its repairing method

Method used

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  • Restoration agent for chromium-contaminated soil and restoration method thereof
  • Restoration agent for chromium-contaminated soil and restoration method thereof
  • Restoration agent for chromium-contaminated soil and restoration method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A chromium-contaminated soil remediation agent and a remediation method thereof, comprising the following steps:

[0035] Preparation of nano-iron (nFe 0 ) suspension: pipette 100mL of FeSO with a concentration of 0.1mol / L 4 ·7H 2 O was added to 100mL ethanol volume concentration of 10% ethanol aqueous solution, stirring continuously to make Fe 2+ Mix well with ethanol, then add dropwise 100mL NaBH with a concentration of 0.3mol / L at 60rpm 4 Solution, continue to stir for 20 minutes until no bubbles are generated to ensure complete reaction, and obtain nano-iron suspension, which is stored in an airtight brown bottle for later use.

[0036] Collect 2kg of chromium-contaminated soil from the chromium-contaminated site, adjust the soil moisture content to 60wt% with water, add 1g / kg of glucose and fully mix it with the soil sample. 2 :H 2 :CO 2 85%: 10%: 5% mixed gas at 30 ° C for 5 days. After three cycles of acclimatization, the soil was taken out, and 1 volume o...

Embodiment 2

[0046] A chromium-contaminated soil remediation agent and a remediation method thereof, comprising the following steps:

[0047] Nano iron (nFe 0 ) suspension and bacteria suspension preparation method as described in embodiment 1, in the process of restoration, according to soil chromium pollution degree, nano-iron suspension and bacteria suspension are fully mixed, so that microorganisms evenly adhere to the surface of nano-iron, made Liquid Restorative.

[0048] Taking by weighing 500g concentration is the chromium-contaminated soil of 200mg / kg, and soil pH value is 6.2, moves in the 1L reactor, water content is 60wt% to regulate soil moisture, adds the remediation agent that contains nano-iron and microorganism (wherein, nano-iron is in The concentration in the chromium-contaminated soil is 0.25g / kg, and the concentration of microorganisms in the chromium-contaminated soil is 80mg / kg), after mixing evenly, they are cultured at room temperature 20°C and 25°C for 14 days. ...

Embodiment 3

[0055]A chromium-contaminated soil remediation agent and a remediation method thereof, comprising the following steps:

[0056] Nano iron (nFe 0 ) suspension and bacteria suspension preparation method as described in embodiment 1, in the process of restoration, according to soil chromium pollution degree, nano-iron suspension and bacteria suspension are fully mixed, so that microorganisms evenly adhere to the surface of nano-iron, made Liquid Restorative.

[0057] Taking by weighing 500g concentration is the chromium-contaminated soil of 200mg / kg, and soil pH value is 6.2, moves in the 1L reactor, water content is 60wt% to regulate soil moisture, adds the remediation agent that contains nano-iron and microorganism (wherein, nano-iron is in The concentration in the chromium-contaminated soil is 0.25g / kg, and the concentration of microorganisms in the chromium-contaminated soil is 80mg / kg), and after mixing evenly, they are cultured statically at normal temperature 30°C respect...

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Abstract

The invention discloses a restoration agent for chromium-contaminated soil and a restoration method thereof. The restoration agent comprises a nanometer iron suspension and a dominant bacterial strainsuspension. The restoration method comprises the following steps: uniformly mixing the nanometer iron suspension and the dominant bacterial strain suspension with the chromium-contaminated soil, adding water to maintain the water content of soil to be 50 to 60%, and carrying out restoration at a normal temperature. According to the invention, through the synergistic action of nanometer iron and microorganisms, hexavalent chromium in the soil is reduced to trivalent chromium; the trivalent chromium and trivalent iron generated by corrosion of the nanometer iron generate an insoluble ferrochrome precipitate; and the chromium is fixed in iron oxide. The restoration method provided by the invention improves adsorption of the nanometer iron and reduction of the hexavalent chromium, and greatlyreduces the migration ability and bioavailability of the chromium at the same time. The restoration agent and the restoration method provided by the invention have the characteristics of high restoration efficiency, simple and convenient operation and stable effect, and are applicable to restoration of the chromium-contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil environment restoration, and in particular relates to a chromium-contaminated soil restoration agent and a restoration method thereof. Background technique [0002] Chromium and its compounds are important chemical raw materials, widely used in metal processing, electroplating, tanning, printing and dyeing, paint and pharmaceutical industries. Due to the leakage of production process, unreasonable discharge of wastewater and infiltration of chromium-containing sludge, a large amount of chromium enters the surrounding soil and groundwater environment. In the natural environment, chromium often exists in two forms: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). Due to its positive charge, trivalent chromium is easily adsorbed by soil colloids and easily generates chromium hydroxide precipitation, which has weak migration ability and low biological toxicity. Hexavalent chromium (CrO 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10C12N1/36
CPCB09C1/10B09C2101/00C12N1/36
Inventor 吴锦华黄静玲李平苏眉
Owner SOUTH CHINA UNIV OF TECH
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