A method for remediating petroleum hydrocarbon-contaminated soil using in-situ oxidation-synchronous air flotation

Abstract

The invention relates to a method for repairing petroleum hydrocarbon polluted soil by using in-situ oxidation-synchronous air flotation. The method uses Fenton-like reagents as in-situ oxidation reagents, the in-situ oxidation reagents are added into the petroleum hydrocarbon polluted soil, a proper amount of water is injected, and full-stir and even mixing are carried out. Under the condition ofnormal temperatures, the in-situ oxidation decomposition of partial petroleum hydrocarbon is achieved. Microbubbles produced during the in-situ oxidation process are taken as a carrier, petroleum hydrocarbon oil drops in polluted water are adhered, the microbubbles float and rise to the water surface, and after the bubbles are broken, the oil drops are collected and recycled. According to the method, petroleum hydrocarbon pollutants are quickly oxidized, meanwhile, partial petroleum hydrocarbon are recycled by usinga synchronous air flotation technology. The method is particularly suitable for repairing moderate petroleum hydrocarbon polluted soil (like the polluted soil with 5-20% of the oil content) and has the advantages that the repair speed of the petroleum hydrocarbon soil is fast,the technology is simple, and requirements for equipment is low.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of environmental protection, and in particular relates to a method for repairing petroleum hydrocarbon-contaminated soil by using in-situ oxidation-synchronous air flotation. [0003] Background technique: [0004] During the process of oil extraction, processing, transportation, storage and use, due to blowout, leakage and other reasons, petroleum hydrocarbons will enter the soil, causing a series of environmental problems and causing harm to human health. Petroleum hydrocarbon pollutants have the characteristics of high toxicity, complex composition, strong binding ability with soil, and difficult desorption. Among them, the hydrophobic characteristics of petroleum hydrocarbons determine that their ability to desorb from the soil is very weak, and the release rate from the soil matrix is ​​slow, thus becoming a persistent source of pollution. [0005] To remediate petroleum hydrocarbon-contaminated...

AI Technical Summary

Problems solved by technology

For moderate (such as oil content of 5% to 20%) petroleum hydrocarbon contaminated soil, if the chemical heat washing method is used, because the oil content of the contaminated soil is low, the recovered crude oil is less, and the chemicals and energy consumption are high. There is a prominent contradiction between cost and benefit

In addition, the chemical heat washing method has poor elution effect on aged petroleum hydrocarbon-contaminated soil, and its application has limitations

The bioremediation cycle is long, and the removal effect of heavy oil remaining in the soil is not ideal, and many plants and microorganisms are difficult to survive in moderate (such as oil content 5% to 20%) petroleum hydrocarbon contaminated soil

At present, there is still a lack of targeted remediation technology for moderate petroleum hydrocarbon-contaminated soils. The development of economical and applicable technologies and processes is not only a research hotspot in the field of environmental chemistry at home and abroad, but also has important practical significance.