Heavy metal and organic matter combined contaminated soil remediation method

A composite pollution and soil remediation technology, applied in the restoration of polluted soil, etc., can solve the problem of inability to synchronously remediate the composite pollution of organic matter and heavy metals.

Inactive Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the combined pollution of organic matter and heavy metals cannot be repaired synchronously in the prior art, and a new method for remediating soil compounded with heavy metals and organic matter is provided, which has the advantage of synchronously repairing combined pollution of organic matters and heavy metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take the soil remediation of a gas station site as an example.

[0019] The gas station has been in use for 34 years, and the soil and groundwater around the oil tanks and fuel dispensers are seriously polluted. The highest concentration of benzene in the soil is 22ppm, the highest concentration of MTBE is 1280ppm, and the highest concentration of lead is 2400ppm. The target value of benzene in the soil is 3.8 ppm, MTBE repair target value is 220ppm, lead repair target value is 800ppm. The pollution depth is 4m from the ground to the ground, the depth of the water level is about 4.7m, the site is clay, and the soil permeability coefficient is 8×10 -7 m / s, the groundwater flow rate is 1cm / day, the pollution plume reaches 15m downstream of the pollution source, and the widest point reaches 6m.

[0020] Ferrous sulfate and ferric chloride (Fe 3+ with Fe 2+ The molar ratio is 2:1) dissolved in deionized water, adding powdered activated carbon with 4 times the mass of Fe,...

Embodiment 2

[0024] Take the soil remediation of a coking enterprise site as an example.

[0025] The soil of the site is sandy clay, and the pollutants are heavy metal copper, lead, and polycyclic aromatic hydrocarbons, among which the maximum monitored concentration of copper is 12200 mg / kg, the maximum monitored concentration of lead is 3340 mg / kg, and the maximum monitored concentration of benzo(a) anthracene is 56 mg / kg, the maximum monitoring concentration of benzo(a)pyrene is 4.7mg / kg.

[0026] Ferrous sulfate and ferric sulfate (Fe 3+ with Fe 2+ The molar ratio is 2:1) dissolved in deionized water, adding montmorillonite with 3 times the mass of Fe, stirring vigorously and heating the solution to 55°C; then adding ammonia solution dropwise under rapid stirring, adjusting the pH of the solution to 9.5, and stopping stirring And leave it to react for a period of time, filter and wash the product repeatedly with deionized water, and dry to obtain Fe 3 o 4 / Montmorillonite magnet...

Embodiment 3

[0030] Take the soil remediation of a coking enterprise site as an example.

[0031] The soil of the site is sandy clay, and the pollutants are heavy metal copper, lead, and polycyclic aromatic hydrocarbons, among which the maximum monitored concentration of copper is 12200 mg / kg, the maximum monitored concentration of lead is 3340 mg / kg, and the maximum monitored concentration of benzo(a) anthracene is 56 mg / kg, the maximum monitoring concentration of benzo(a)pyrene is 4.7mg / kg.

[0032] Ferrous sulfate and ferric sulfate (Fe 3+ with Fe 2+ The molar ratio is 2:1) dissolved in deionized water, adding montmorillonite with 3 times the mass of Fe, stirring vigorously and heating the solution to 55°C; then adding NaOH solution dropwise under rapid stirring, adjusting the pH of the solution to 11, and stopping stirring And leave it to react for a period of time, filter and wash the product repeatedly with deionized water, and dry to obtain Fe 3 o 4 / Montmorillonite magnetic c...

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PUM

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Abstract

The invention relates to a heavy metal and organic matter combined pollution soil remediation method, which mainly solves the problem that in the prior art, organic matter and heavy metal combined pollution cannot be remediated synchronously. The invention adopts the heavy metal and organic matter combined polluted soil remediation method, which comprises the following steps: firstly, preparing aFe3O4 magnetic composite adsorption material; then using the adsorbing material for strongly adsorbing heavy metals and organic matters in soil and meanwhile adding H2O2, so that the organic matters adsorbed on the surface of the adsorption material are subjected to advanced oxidative degradation by utilizing Fe3O4 / H2O2 heterogeneous Fenton; after adsorption saturation, carrying out magnetic separation recovery on the Fe3O4 magnetic composite adsorbing material adsorbing heavy metals and residual organic matters through a magnetic separation technology. According to the technical scheme, adsorption / magnetic separation recovery of heavy metal and oxidative degradation of organic matter are achieved, synchronous and efficient remediation of heavy metal and organic contaminated sites is achieved, the problems are well solved, and the method can be used for soil remediation.

Description

technical field [0001] The invention relates to a method for remediating heavy metal and organic compound polluted soil, and belongs to the technical field of soil remediation of heavy metal and organic compound polluted sites. Background technique [0002] Soil pollution mainly includes heavy metals, non-heavy metal inorganic pollution, organic pollutants, radioactive pollutants, etc. Among them, heavy metal-organic compound pollution is a common form of soil pollution. In recent years, compound polluted soil has attracted widespread attention from the scientific community, and important explorations have been made in soil pollution prevention and remediation. [0003] However, the properties of organic pollutants and heavy metals are significantly different, and the corresponding remediation technologies vary greatly. For example, gas phase extraction has a better effect in remediating VOCs-contaminated soil, and thermal desorption, incineration, and chemical oxidation are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08
Inventor 张宏哲刘政伟牟桂芹房师平张志远郭磊
Owner CHINA PETROLEUM & CHEM CORP
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