Technique for purifying heavy oil-contaminated soil by acoustochemical method

A sonochemical and polluted soil technology, applied in the restoration of polluted soil, etc., can solve the problems of being vulnerable to harsh environmental impact, limited repair effect, short treatment cycle, etc., and achieves the effects of environmental friendliness, easy recycling, and short time

Inactive Publication Date: 2011-09-07
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the shortcomings of the existing treatment technology of heavy oil polluted soil, such as limited restoration effect, easy to cause secondary pollution, long time consumption, and easy to be impacted by harsh environments

Method used

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  • Technique for purifying heavy oil-contaminated soil by acoustochemical method
  • Technique for purifying heavy oil-contaminated soil by acoustochemical method

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specific Embodiment approach 1

[0014] Specific implementation mode 1: A sonochemical method for purifying heavy oil-contaminated soil technology. After mixing the soil sample with deionized water, it is prepared into a slurry with a liquid-solid mass ratio of 4:1, and Na is added to the slurry. 2 CO 3 And control its mass content to 0.10%, add NaOH solution to adjust the pH value to 8, and use ultrasonic wave to clean the mud for 5 minutes at the treatment temperature of 25°C, and the ultrasonic frequency is set to 48KHz.

specific Embodiment approach 2

[0015] Specific implementation mode two: a sonochemical method for purifying heavy oil-contaminated soil technology, mixing soil samples with deionized water to prepare mud with a liquid-solid mass ratio of 6:1, and adding Na to the mud 2 CO 3 And control its mass content to 0.13%, add NaOH solution to adjust the pH value to 8.5, and use ultrasonic wave to clean the mud for 10 minutes at the treatment temperature of 18°C, and the ultrasonic frequency is set to 55KHz.

specific Embodiment approach 3

[0016] Specific implementation mode three: a sonochemical method for purifying heavy oil-contaminated soil technology, mixing soil samples with deionized water to prepare mud with a liquid-solid mass ratio of 8:1, and adding Na to the mud 2 CO 3 And control its mass content to 0.15%, add NaOH solution to adjust the pH value to 9, and use ultrasonic wave to clean the mud for 14min at the treatment temperature of 20°C, and the ultrasonic frequency is set to 63KHz.

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Abstract

The invention relates to a technique for purifying heavy oil-contaminated soil by an acoustochemical method, which comprises: preparing slurry by mixing an oil sample and deionized water, regulating the pH value of the slurry to 8 to 10, cleaning the slurry for 3 to 20 minutes by using ultrasonic waves at a treatment temperature of 15 to 25 DEG C, wherein an ultrasonic frequency is set to be 48 to 70kHz. When treated by the technique provided by the invention, the primary purification efficiency at normal temperature of the heavy oil-contaminated soil is increased and stabilized above 92 percent; and a requirement on a national allowed standard critical value of 500mg/kg is met. After Na2CO3 is added, the calcium and magnesium cations in soluble salts can be precipitated and separated by carbonates, and the created alkaline environment can completely shield interaction between solids brought by bivalent cations, particularly magnesium ions, and polar oil. A built acoustochemical operation parameter system can be quickly, simply and effectively used for heavy oil contamination remediation for purifying fine-grained salinized soil. After the heavy oil component of cleaning solution is subjected to simple standing and skimming treatment, the repeated utilization of the alkaline cleaning solution can be taken into consideration.

Description

technical field [0001] The invention relates to a technology for remediating oil-polluted soil, in particular to a technology for purifying heavy oil-polluted soil by sonochemistry. Background technique [0002] When the soil system adsorbs petroleum substances, the inorganic minerals of the soil are strong adsorbents. Since soil minerals account for the vast majority of soil dry weight, the adsorption of minerals often exceeds that of organic matter. Heavy oil pollutants belong to the category of hydrophobic organic pollutants (HOCs). Due to the complex composition and large difference in molecular structure of heavy oil pollutants, the evolution in soil is more complicated. Some existing treatment methods have many disadvantages, such as simple landfill will pollute groundwater, incineration treatment usually needs to add combustion-supporting fuel, and there is waste gas emission, chemical extraction needs to add chemical agents, there is still sewage and waste residue d...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 温军杰贾永刚
Owner OCEAN UNIV OF CHINA
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