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Oily sludge and contaminated soil generated during oil extraction, storage, transportation and processing have become "invisible killers" threatening the ecological environment. It is estimated that the total amount of existing oil-contaminated soil in my country exceeds 2 billion cubic me

Oily sludge and contaminated soil generated during oil extraction, storage, transportation and processing have become "invisible killers" threatening the ecological environment. It is estimated that the total amount of existing oil-contaminated soil in my country exceeds 2 billion cubic meters, of which oilfield area pollution accounts for more than 60%. Traditional treatment methods such as incineration and landfill are not only costly, but also more likely to cause secondary pollution. In this context, Desen Environment's independently developed sludge hot washing technology, with "resource utilization, low carbonization, and scale" as the core, has created a new paradigm for oil-contaminated soil governance and truly realized the ecological value transformation of "turning waste into treasure".

Desen's sludge hot washing technology solves the problem of stable combination of petroleum hydrocarbons and soil particles through the synergistic mechanism of "thermal activation-chemical stripping-gradient separation". Its technical system includes three major innovative modules:

Thermal activation module: using graded heating technology, precise temperature control in the temperature range of 200-450℃, and destroying the oil-soil interface bonding force through heat conduction. The matching waste heat recovery device can increase the system thermal efficiency to 85%, reducing energy consumption by 40% compared with traditional equipment.

Chemical stripping module: The independently developed composite cleaning agent combines the synergistic effect of surfactants and chelating agents to increase the efficiency of petroleum hydrocarbon stripping to more than 92%. This formula uses bio-based raw materials in a breakthrough way, achieving a cleaning agent biodegradability rate of over 98%, avoiding the environmental residual risk of traditional chemical agents.

Gradient separation module: Integrates multi-stage cyclone sorting and membrane separation technology to build an oil-water-solid three-phase separation system. Among them, the sand and gravel aggregate reuse rate exceeds 90%, the recovered oil products meet the industrial fuel standards, and the recycling rate of treated water after purification reaches 80%.

Desen oil sludge hot washing technology has verified its effectiveness in major projects in many countries or regions. In the Changqing Oilfield Production Plant No. 2 project, a total of 120,000 cubic meters of oily soil were treated, 4,300 tons of crude oil were recovered, and direct economic value exceeded 20 million yuan. After restoration, the total petroleum hydrocarbon (TPH) content of the soil is stably lower than 800 mg/kg, meeting the requirements of the "Soil Environmental Quality Construction Land Standard", and the treatment cycle is shortened by 60% compared with traditional methods. In the treatment of a chemical heritage site in Putuo, Shanghai, 53,000 cubic meters of oil-containing soil were repaired using hot washing technology. After the repair, the site was used to build a new energy storage base, and the land premium rate increased by 280%, realizing a virtuous cycle of "pollution control-land appreciation-industry upgrading".

The treatment of oil-contaminated soil is essentially the salvation of human beings for the by-products of industrial civilization. With technological innovation as the fulcrum, Desen Environment not only revived the contaminated land, but also opened up a sustainable development path of "environmental governance-resource regeneration-value creation". When the dark brown sludge is transformed into pure land where vegetation can grow through technology, and when the recovered crude oil is re-integrated into the industrial blood, what we see is not only the victory of technology, but also a profound response to the civilization proposition of "harmonious coexistence between man and nature". In the journey of building a beautiful China, Desen's oil sludge hot washing technology is writing a green answer to ecological restoration.