Process and device for mobile type rapid elution of oil contaminated soil

A kind of oil pollution, mobile technology, applied in the recovery of polluted soil and other directions, can solve the problems of low cleaning efficiency, small hydrophobic core, unfavorable development of mobile elution equipment, etc., to achieve high deoiling efficiency and short disposal time. Effect

Active Publication Date: 2019-02-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surfactant cleaning method is to achieve the solubilization and elution of petroleum hydrocarbons in the soil by selecting an appropriate cleaning agent. Currently, the commonly used cleaning agents are small molecule anions and nonionic surfactants. Studies have shown that small molecule anions and nonionic surfactants There are two main problems in the cleaning of petroleum-contaminated soil by surfactants: (1) the hydrophobic inner core of the micelles is small, resulting in low cleaning efficiency for high-concentration petroleum pollutants in the soil; (2) the cleaning of petroleum hydrocarbons in the soil requires less High temperature (60-90°C), so an external heat source is required, which is not conducive to the development of mobile elution equipment
In recent years, thermal desorption has been used in the deep remediation of oil-contaminated soil due to its thorough treatment and high resource utilization, but there are still problems such as high energy consumption, poor stability, serious secondary pollution and poor mobility that need to be solved urgently. The problem
Most oil-contaminated sites in oil fields are relatively scattered. The current method of remediating contaminated soil is to excavate the soil contaminated by petroleum hydrocarbons, transfer it to a centralized treatment site, and use fixed treatment equipment to treat the oil-contaminated soil ex situ, resulting in contaminated soil. It cannot be repaired in a timely and effective manner. There is an urgent practical demand for the development of a mobile fast-elution process and device for repairing oil-contaminated soil, but it has not been reported yet.

Method used

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  • Process and device for mobile type rapid elution of oil contaminated soil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment will be 0.6m 3 Petroleum-contaminated soil (60% soil moisture content, 16% oil content) is added to the upper hopper, and the impurities are removed through a drum screen and then enters the homogenization tank. At the same time, 3.4m is added to the homogenization tank 3 Water, keep stirring to make it evenly. Use the first mud pump 7 to pump the sieved slurry into the oxidation desorption device, and add 9L of 0.6mol / L citric acid solution, 9L of 0.6mol / L sodium hydroxide solution, and 1.2mol / L of hydrochloric acid. 90L and 18L of 0.3mol / L ferrous sulfate solution, turn on the mixer to mix and stir evenly, and finally slowly add 54L of hydrogen peroxide with a mass concentration of 28% to the slurry, and continue to stir to make it fully react. The time for in-situ oxidation and air flotation is 2h, after the reaction is over, use the second mud pump to pump the mud into the sedimentation separation device. After standing for 30 minutes, use the oil scra...

Embodiment 2

[0052] Will be 0.6m 3 Petroleum-contaminated soil (60% soil moisture content, 16% oil content) is added to the upper hopper, and the impurities are removed through a drum screen and then enters the homogenization tank. At the same time, 3.4m is added to the homogenization tank 3 Water, keep stirring to make it evenly. Use a mud pump to drive the sieved slurry into the oxidation desorption device, add 6L of 0.6mol / L citric acid solution, 6L of 0.6mol / L sodium hydroxide solution, 60L of 1.2mol / L hydrochloric acid and 0.6 mol / L ferrous sulfate solution 12L, turn on the mixer to mix and stir evenly, and finally add 54L of hydrogen peroxide with a mass concentration of 28% into the mud slowly, continue to stir to make it fully react, and the time for in-situ oxidation and air floatation is 2h. After the end, use the mud pump to drive the mud into the sedimentation separation device, and after standing for 30 minutes, use the oil scraper to scrape the surface oil into the mud collecti...

Embodiment 3

[0055] Will be 0.6m 3 Petroleum contaminated soil (soil water content of 50%, oil content of 15%) is added to the upper hopper, after passing through a roller screen to remove impurities, it enters the homogenization tank, while adding 3.4m to the homogenization tank 3 Water, keep stirring to make it evenly. Use a mud pump to drive the sieved slurry into the oxidation desorption device, add 9L of 0.6mol / L citric acid solution, 9L of 0.6mol / L sodium hydroxide solution, 90L of 1.2mol / L hydrochloric acid and 0.6 mol / L ferrous sulfate solution 18L, turn on the mixer to mix and stir evenly, finally slowly add 90L of hydrogen peroxide with a mass concentration of 14% to the mud, continue to stir to make it fully react, where the in-situ oxidation and air floatation time is 2h, the reaction After the end, use the mud pump to drive the mud into the sedimentation separation device, and after standing for 30 minutes, use the oil scraper to scrape the surface oil into the mud collection bu...

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Abstract

The invention relates to a process and device for mobile type rapid elution of oil contaminated soil. The process specifically comprises the steps of sieve modulation, oxidative desorption, static separation, jet air flotation, flocculation air flotation, and oil-water separation. The process uses a Fenton-like reagent as an oxidizing agent, and the micro-bubbles generated during the reaction process adhere to the oil hydrocarbon molecules. After the micro-bubbles float to the surface of the water, the loaded oil droplets converge to form an oil film. After static separation, an oil scraping device is used to scrape the surface oil slick; then mud subjected to surface deoiling is fed into an air flotation separation device by a jet device; and the tiny bubbles in the mud sand are quickly collected into large bubbles and are released to the surface of a water layer; and an oil film is formed by oil hydrocarbons with the bubbles on the surface of the water, and removed by the oil scraping device to achieve oil-water separation. The process of the invention is used to treat oil-contaminated soil, and has the characteristics of high deoiling efficiency and short disposal time, and thedevice can realize armorization and form a complete set for mobile rapid elution of oil contaminated soil.

Description

Technical field [0001] The invention relates to a mobile process and device for quickly eluting petroleum-contaminated soil. Background technique [0002] The petroleum-contaminated soil produced during the process of oilfield exploitation, storage and transportation has serious harm to the environment and human health. It has been listed in my country's "National Catalog of Hazardous Wastes", and "National Cleaner Production Promotion Law" and "Solid Waste Environmental Pollution Prevention Law" It is also required to be treated in a harmless manner. It is urgent to develop petroleum-contaminated soil remediation technology and equipment suitable for my country's national conditions. [0003] In the past, the main methods of treating petroleum-contaminated soil were surfactant cleaning and thermal desorption. Surfactant cleaning method is to realize the solubilization and elution of petroleum hydrocarbons in the soil by selecting appropriate cleaning agents. At present, the commo...

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 马小东
Owner HEBEI UNIV OF TECH
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