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Urban sewer sludge—hidden deep within the “veins of the city”—is a major environmental risk. Mixed with oil, heavy metals, sand, stones, and debris, this sludge is highly contaminated and has an extremely high moisture content. If improperly stored, it can pollute surrounding soil and water bodi

Urban sewer sludge—hidden deep within the “veins of the city”—is a major environmental risk. Mixed with oil, heavy metals, sand, stones, and debris, this sludge is highly contaminated and has an extremely high moisture content. If improperly stored, it can pollute surrounding soil and water bodies. Traditional disposal methods such as landfill and open-air drying are inefficient and often cause secondary pollution.

Solving the challenge of safe and efficient sewer sludge treatment has become a key priority in modern urban environmental management. With its core advantages—high-efficiency separation, on-site processing, and a closed-loop environmental design—Desen Environmental’s Mobile Washing plant provides a practical and advanced solution for the harmless and resource-based treatment of sewer sludge.

On-Site Treatment: Eliminating Transport Risks and Improving Efficiency

Traditional sludge handling requires transporting waste to a central facility, which consumes manpower, increases costs, and risks leakage during transit. Desen’s mobile washing plant features a crawler-based design that allows it to reach sewer maintenance sites, pipeline renovation zones, and sludge temporary storage areas directly—eliminating the need for permanent infrastructure.

Once on-site, the equipment is quickly deployed. Its high-efficiency crushing and screening system separates large debris such as stones and bricks. Then, using custom washing agents combined with high-frequency vibration, the machine removes oil pollutants and heavy metals. With continuous operation, a single plant can process tens of tons per day, significantly reducing the sludge backlog and preventing secondary pollution caused by prolonged storage.

Deep Pollutant Removal with Intelligent Detection and Adaptive Treatment

Sewer sludge contains dispersed and persistent pollutants, making advanced purification essential. Desen’s Mobile Washing plant is equipped with an intelligent detection and adaptive control system that identifies concentrations of oil contaminants and heavy metals such as lead, cadmium, and mercury.

The equipment automatically adjusts washing parameters and reagent ratios. Through a combination of physical separation and chemical chelation, heavy metals are securely captured and removed, achieving a removal rate of over 90%. At the same time, advanced demulsification technology breaks down oil residues, enabling high-efficiency oil–sludge separation. After treatment, the sludge’s moisture content is significantly reduced, and it meets harmless discharge standards.

Closed-Loop Environmental System: Zero Wastewater Discharge, Full Resource Recovery

Wastewater and residual waste are major sources of secondary pollution in sludge treatment. Desen’s system integrates a complete wastewater treatment module. After sedimentation, filtration, and catalytic oxidation, the wastewater can be reused for washing or safely discharged—achieving zero external wastewater discharge.

Separated solid debris is sorted for recycling and can be used for brick production or road base backfill. Polluted residues are sealed and sent to specialized facilities for safe disposal. This full-process closed-loop design ensures truly green, environmentally friendly treatment.

A Proven Solution for Cities: Efficient, Cost-Effective, and Resource-Oriented

From large municipal sewer-cleaning projects to pipeline renovation in older commplanties, Desen’s Mobile Washing plant has been widely deployed across many cities. Treated sludge not only meets harmless disposal standards—it can also be reused as construction material, turning waste into valuable resources.

By offering a mobile, precise, and environmentally sustainable treatment approach, Desen Environmental strengthens the protection of urban underground pipelines, enhances treatment efficiency, reduces operational costs, and supports continuous improvement of urban ecological environments.