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A compound eluent for remediating polycyclic aromatic hydrocarbon-contaminated soil and its application

A technology for polycyclic aromatic hydrocarbons and polluted soil, applied in the field of contaminated soil remediation, can solve problems such as refractory biodegradation, secondary pollution, and increased soil acidity, and achieve the effects of reducing adsorption, improving solubilization, and promoting desorption

Active Publication Date: 2022-05-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used surfactants include Tween-80 (Tween-80), Triton X-100 (TX-100), lauryl polyoxyethylene ether (Brij-35) and sodium dodecyl sulfate (SDS), etc. , although these surfactants can effectively desorb pollutants from the soil, high concentrations of surfactants also exist in the soil at the same time, and are prone to secondary pollution because they are difficult to be biodegraded
Low-molecular-weight organic acids, such as citric acid, oxalic acid, malic acid, etc., are one of the most active components in plant root exudates and are widely used in soil heavy metal remediation because of their strong chelating ability. The organic acids in the soil will also increase the acidity of the soil and affect the physical and chemical properties of the soil.
In short, although the existing leaching agents have a certain removal efficiency for polycyclic aromatic hydrocarbons, they all have a great impact on the physical and chemical properties of the soil, and will also bring new pollutants after leaching. How to overcome these problems, The development of an environmentally friendly and inexpensive leaching agent for the treatment of PAH-contaminated soil has become the focus of research in this field

Method used

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  • A compound eluent for remediating polycyclic aromatic hydrocarbon-contaminated soil and its application
  • A compound eluent for remediating polycyclic aromatic hydrocarbon-contaminated soil and its application
  • A compound eluent for remediating polycyclic aromatic hydrocarbon-contaminated soil and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The above-mentioned compound eluent is used to remediate polycyclic aromatic hydrocarbon-contaminated soil (the contaminated soil taken is recorded as soil A, and the specific components and other performance data are shown in Table 1), specifically including the following steps:

[0046] (1) Dry the soil A, remove the fallen leaves and gravel and pass through a 60-mesh sieve after grinding, dissolve 20 mg of solid naphthalene in 160 mL of acetone at room temperature, then mix the acetone solution containing naphthalene with 200 g of soil A Shake and mix in a constant temperature shaking box at 20°C for one week, then place in a fume hood to volatilize acetone, and artificially polluted soil is aged at 4°C for two weeks before use.

[0047] (2) the concentration is 0.2g / L citric acid solution (solvent is ultrapure water, the same below) and the concentration is 10.0g / L alkyl glycoside APG0814 solution (solvent is ultrapure water, the same below) by volume ratio 1:2, 1:1...

Embodiment 2

[0052] The above-mentioned compound eluent is used to remediate polycyclic aromatic hydrocarbon-contaminated soil (the contaminated soil taken is recorded as soil B, and the specific components and other performance data are shown in Table 1), specifically including the following steps:

[0053] (1) Dry the soil B, remove the fallen leaves and gravel and pass through a 60-mesh sieve after grinding, dissolve 20 mg of solid naphthalene in 160 mL of acetone at room temperature, then mix the acetone solution containing naphthalene with 200 g of soil B Shake and mix in a constant temperature shaking box at 20°C for one week, then place in a fume hood to volatilize acetone, and use artificially polluted soil after aging at 4°C for two weeks.

[0054] (2) Mix the citric acid solution with a concentration of 0.2g / L and the alkyl glycoside APG0814 solution with a concentration of 10.0g / L at a volume ratio of 1:2, 1:1 or 2:1, respectively as a compound rinse Agent I, compound eluent II ...

Embodiment 3

[0059] The above-mentioned compound eluent is used to remediate polycyclic aromatic hydrocarbon-contaminated soil (the contaminated soil taken is recorded as soil C, and the specific components and other performance data are shown in Table 1), specifically including the following steps:

[0060] (1) Dry the soil C, remove the dead leaves and gravel and grind it through a 60-mesh sieve, dissolve 20 mg of solid naphthalene in 160 mL of acetone at room temperature, then mix the acetone solution containing naphthalene with 200 g of soil C Shake and mix in a constant temperature shaking box at 20°C for one week, then place in a fume hood to volatilize acetone, and artificially polluted soil is aged at 4°C for two weeks before use.

[0061] (2) Mix the citric acid solution with a concentration of 0.2g / L and the alkyl glycoside APG0814 solution with a concentration of 10.0g / L at a volume ratio of 1:2, 1:1 or 2:1, respectively as a compound rinse Agent I, compound eluent II and compou...

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Abstract

The invention relates to a compound leaching agent for repairing polycyclic aromatic hydrocarbon-contaminated soil and its application, wherein the compound leaching agent comprises a solute and a solvent, the solute is citric acid and an alkyl glycoside, and the citric acid The concentration in the compound eluent is (0.2 / 3~0.4 / 3) g / L, and the concentration of the alkyl glycoside in the compound eluent is (10 / 3~20 / 3) g / L . The application specifically includes the following steps: (1) weighing the pretreated soil sample containing polycyclic aromatic hydrocarbons, adding a compound eluent and mixing evenly to obtain a repaired sample; (2) mixing the uniformly repaired sample obtained in step (1) The samples were placed in a constant-temperature shaking box for uniform vibration reaction, so that the soil and the compound eluent were fully contacted; (3) During the shaking reaction process, part of the repaired samples were taken out at each predetermined time point, and the filtrate and filter residue were obtained after filtration. The concentration of PAHs in the filtrate was then determined. Compared with the prior art, the present invention achieves the purpose of efficiently and lastingly treating pollutants and reducing the cost of remediation of polluted soil.

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and in particular relates to a compound eluent for remediating polycyclic aromatic hydrocarbon contaminated soil and an application thereof. Background technique [0002] In recent years, with the rapid development of my country's industrialization and the continuous expansion of urbanization scale, various chemical raw materials have been widely used in social production and life. Due to the excessive use of chemical raw materials, the arbitrary discharge of waste, and the unreasonable disposal of toxic and harmful substances, the pollution of soil and groundwater is becoming more and more serious. Among them, persistent organic pollutants (Persistent Organic Pollutants, POPs) have become one of the important issues facing soil and groundwater remediation due to their characteristics of being difficult to degrade and causing long-term harm to the environment. Polycyclic aromatic hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/14
CPCB09C1/02B09C1/08C09K17/14
Inventor 吕树光曾贵禄孙勇黄靖瑶杨儒民刘玉龙张祥付融冰
Owner EAST CHINA UNIV OF SCI & TECH
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