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A stepwise cleaning method for highly dispersed petroleum hydrocarbon contaminated clayey soil
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A technology for clay soil and petroleum hydrocarbons, which is applied in the restoration of polluted soil and other directions, can solve problems such as difficult and efficient green restoration, and achieve the effects of good cleaning ability, cost saving and high stability
Active Publication Date: 2022-05-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0006] The present invention aims at the problem of high-dispersion petroleum hydrocarbon-contaminated clay soil that is difficult to efficiently remediate greenly, and provides a stepwise cleaning method, specifically by gradually adding non-ionic surfactants and anionic surfactants, inorganic salts, auxiliary alcohols, compounding Forming surfactant solution, emulsion-type water-based cleaning agent and single-phase microemulsion in sequence, supplemented by ultrasonic coupling treatment, to achieve the purpose of cascade cleaning of highly dispersed petroleum hydrocarbon polluted clay soil
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Embodiment 1
[0033] Contaminated soil sample A was taken from Shengli Oilfield in Shandong Province. The contaminated soil was severely compacted, appeared black-brown on the surface, had poor fluidity and a large overall density (greater than 1.0 g / cm). 3 ), with a typical pungent taste of crude oil. The petroleum hydrocarbon content of the contaminated soil was measured to be 33.5wt.%, and the specific surface area was as high as 180m 2 / g, high dispersibility (sand grains, powder particles and viscosity particles accounted for 8.6wt.%, 12.4wt.% and 79.0wt.%) respectively, cation exchange (CEC) of 30.0cmol / kg, less than 150 mesh accounted for 56.0wt.%.
[0034] Take this contaminated soil, air-dry it, remove plant residue, crush it and pass it through a 40 mesh sieve as a target sample for elution.
[0035] The specific cleaning steps are: according to the mass fraction, the dosage ratio of C13 isopropanolamide, S-CMC, auxiliary alcohol, cyclodextrin and inorganic salt is 1.0wt.%:1.0wt.%:9.6wt...
Embodiment 2
[0037] Sample B of oil-contaminated soil was from the Karamay Oilfield in Xinjiang. The contaminated soil is heavily clumped and platened, with a black-gray appearance on the surface, which also has a typical pungent smell of crude oil. The petroleum hydrocarbon content of the contaminated soil was measured at 34.8wt.%, and the specific surface area was as high as 168m 2 / g, high dispersibility (sand particles, powder particles and viscosity particles accounted for 9.6wt.%, 15.3wt.% and 75.1wt.%) respectively, cation exchange (CEC) of 28.0cmol / kg, less than 150 mesh accounted for 53.0wt.%.
[0038] Take this contaminated soil sample, air-dried, remove plant residue, crush it and pass it through a 40 mesh sieve as the target sample for elution.
[0039] The specific cleaning steps are: According to the mass fraction, the ratio of C13 isopropanolamide, S-CMC, auxiliary alcohol, sodium humic acid, sodium alginate to inorganic salt is 1.0wt.%:0.5wt.%:8.5wt.%:0.2wt.%:0.2wt.%:0.2wt.%:0....
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Abstract
The invention discloses a stepwise cleaning method for clay soil polluted by highly dispersed petroleum hydrocarbons. Firstly, C13 isopropanolamide solution, water-soluble cellulose sulfamic acid, inorganic salts and clay soil polluted by highly dispersed petroleum hydrocarbons are uniformly mixed, Form an emulsion-type water-based cleaning system; then add auxiliary alcohol and compounding agent to form a single-phase microemulsion cleaning system in situ; then supplement with ultrasonic coupling treatment to complete the elution of petroleum hydrocarbons in the pores of soil particles; finally centrifuge and recover single-phase microemulsion cleaning system The phase microemulsion can be recycled without ion exchange or demulsification, etc. The soil is centrifuged for secondary washing with hot water, and the washing liquid is directly recycled. The present invention adopts the cascade cleaning method for clayey soil polluted by highly dispersed petroleum hydrocarbons, and has the advantages of simple operation process, strong controllability, high cascade cleaning efficiency, good soil restoration effect, green cleaning system and easy recycling of the cleaning solution, etc. , showing potential environmental and economic benefits.
Description
Technical field [0001] The present invention belongs to the field of petrochemical environmental protection, relates to a highly dispersed petroleum hydrocarbon contaminated with clay soil cascade cleaning method. Background [0002] With the rapid development of the petroleum industry, oil enters the soil environment in the process of exploration, exploitation, transportation, storage and processing, resulting in soil salinization, asphalting and compaction, which not only destroys the soil structure and function, leads to the deterioration of the microbial living environment; it will also cause radiation pollution to the surrounding water bodies and atmosphere, and even threaten human health. According to statistics, every 200 tons of crude oil processed by petroleum and petrochemical refineries will produce 1 ton of oil contaminated soil, according to which it is expected that the global petrochemical industry will produce about 20 million tons of oil contaminated soil per ye...
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