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In the context of rapid industrial development and widespread exploitation of oil resources, the problem of oil-contaminated soil has become increasingly prominent and has become an important issue that needs to be solved in the field of environmental protection. Traditional treatment methods often

In the context of rapid industrial development and widespread exploitation of oil resources, the problem of oil-contaminated soil has become increasingly prominent and has become an important issue that needs to be solved in the field of environmental protection. Traditional treatment methods often have problems such as low efficiency, high cost, and serious environmental pollution. In recent years, chemical hot washing technology has gradually become one of the mainstream technologies for the remediation of oil-contaminated soil due to its high efficiency, economy, and environmental protection.

The core of chemical hot washing technology is to use cleaning agents under optimal process parameters to peel, desorb, and displace mineral oil from solid materials such as clay minerals, or destroy the emulsification system to achieve three-phase separation of oil, water, and solids. . This technology uses cleaning agents to reduce the interfacial tension between mineral oil and solid substances, making it easier for mineral oil to separate from the solid surface, and further promotes the release and separation of oil through high temperature and stirring.

Compared with traditional methods, chemical hot washing technology has the following significant advantages:

High efficiency: By optimizing the cleaning agent formula and process parameters, the oil recovery rate can be significantly increased to more than 90%.

Low cost: low equipment investment and low operating costs, suitable for large-scale applications.

Environmental protection: The wastewater and exhaust gas generated during the treatment process have been strictly purified and comply with environmental protection emission standards.

Resource recovery: The crude oil recovered from the sludge can be reused to achieve resource recycling.

Desen oily soil thermal washing system is a typical representative of chemical thermal washing technology in practical applications. This system uses a physical hot washing process to efficiently classify and reduce bulk oil-contaminated soil, achieving the comprehensive remediation goals of waste oil recovery, solid material backfilling, and standard mud cake disposal. The system mainly includes a feeding module, a scrubbing module, a multi-stage washing and classifying module, a high-efficiency concentration module, a filter press module, a water treatment module and an electrical control module. In actual operation, the treatment effect can be effectively improved by adjusting parameters such as cleaning agent type, hot washing temperature, liquid-to-solid ratio, and stirring speed.

Although chemical thermal washing technology shows great potential in the remediation of oil-contaminated soil, it still faces some challenges and room for improvement:

Selection and optimization of cleaning agents: Most of the cleaning agents currently used are surfactants, but their environmental impact is large. In the future, more biodegradable green cleaning agents need to be developed to reduce negative impacts on the environment.

Optimization of process parameters: Through orthogonal experiments and field tests, further optimize the cleaning agent formula and process parameters to improve treatment efficiency and oil recovery rate.

Combination with other technologies: Combine chemical hot washing technology with other treatment methods (such as biological treatment, pyrolysis, etc.) to form a diversified treatment system and improve the overall treatment effect.

Chemical hot washing technology has broad application prospects in the field of oil-contaminated soil remediation due to its high efficiency, economy, and environmental protection. The successful application of Desen's oily soil thermal washing system provides strong technical support for large-scale oil-contaminated soil remediation. In the future, with the continuous optimization and innovation of technology, chemical hot washing technology is expected to play a greater role in environmental protection and resource recycling.