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Oily sludge is a hazardous waste generated throughout the oil extraction, transportation, refining, and oily wastewater treatment processes. It mainly consists of crude oil, water, and solids, with an oil content ranging from 10% to 50%. According to industry estimates, nearly 3 million tons of oily

Oily sludge is a hazardous waste generated throughout the oil extraction, transportation, refining, and oily wastewater treatment processes. It mainly consists of crude oil, water, and solids, with an oil content ranging from 10% to 50%. According to industry estimates, nearly 3 million tons of oily sludge are produced annually in China, containing approximately 600,000 tons of recoverable crude oil. Direct disposal not only wastes valuable resources but also causes serious environmental pollution, contradicting the core principles of solid waste management: reduction, resource recovery, and harmless treatment.

Efficient Oily Sludge Treatment with Thermal Washing Technology

To address these challenges, Desen Environment has developed an advanced thermal soil washing system, specifically designed for large-scale treatment of oil-contaminated soil and oily sludge. The system enables both oil recovery and environmentally compliant disposal, ensuring that treated solids meet backfilling standards while sludge residues are safely handled.

Fully Integrated, Modular & Intelligent System

The Desen thermal washing system features a modular integrated design, forming a complete closed-loop process from feeding to final disposal. Key stages include:

• Oily sludge pre-treatment

• Thermal washing and separation

• Particle classification and recovery

• Concentration and filter pressing

• Wastewater purification and reuse

Equipped with a PLC intelligent control system, the equipment can precisely regulate critical parameters such as washing temperature, liquid-solid ratio, and processing time, ensuring stable performance while minimizing manual intervention and operational costs. The system is highly adaptable to different sludge types and treatment capacities.

Key Advantages Over Traditional Methods

Compared with conventional methods such as incineration and landfill, Desen’s thermal washing system offers clear and practical advantages:

• High Resource Recovery Rate
  Oil recovery exceeds 85%, and recovered crude oil can be reused in refining processes. Solid materials achieve over 90% reuse rate, enabling true resource recycling.

• Environmentally Compliant & Pollution-Free
  The system uses a purely physical thermal washing process, avoiding secondary pollution. Wastewater is treated and recycled within the system, meeting strict environmental standards.

• Significant Volume Reduction
  Sludge volume is reduced by 70%–80%, greatly lowering storage and transportation costs.

• Wide Applicability & Easy Operation
  Suitable for various scenarios including oilfield operations and refinery waste treatment, with automated control reducing labor requirements and simplifying maintenance.

Supporting Sustainable Oil Industry Development

Desen Environment’s thermal soil washing system effectively addresses the key challenges of oily sludge treatment while strictly adhering to solid waste management principles. It not only helps oil companies achieve environmental compliance, but also recovers valuable crude oil, reducing economic losses.

By combining efficiency, sustainability, and cost-effectiveness, this solution provides strong technical support for the green transformation of the oil and gas industry.