Indirect thermal desorption involves leasing the 2022 slag site soil treatment project of Wushihua
Project Name: Wushihua 2022 Slag Site Soil Remediation Project
Project Description:
This project, based on the overall plan for the Wushihua 2022 Slag Site Soil Remediation Project, focuses on soil pollution issues at the slag site and surrounding areas in Midong District, Urumqi City, Xinjiang Uygur Autonomous Region. It aims to utilize specialized remediation technologies to fulfill environmental supervision requirements and achieve harmless disposal and resource utilization of contaminated soil. Our company is responsible for the ex situ thermal desorption treatment of high-concentration soil, a core component of the project with high technical difficulty and large-scale disposal, and plays a key role in supporting the overall remediation effectiveness.
The core objective of the project is to remediate highly organically contaminated soil to the remediation target values specified in the "Soil Environmental Quality - Construction Land Soil Pollution Risk Control Standard (Trial)" (GB 36600-2018) and project requirements. Specifically, these include phenol ≤ 90mg/kg, benzene ≤ 4mg/kg, and petroleum hydrocarbons ≤ 4500mg/kg, ensuring that the remediated soil meets the requirements for subsequent safe use. 1. Disposal Scale: This project requires the remediation of 57,563 m³ of highly organically contaminated soil, including 18,129 m³ outside the slag dump and 39,434 m³ within the dump. Due to the use of in-situ ex-situ thermal desorption technology, excavation and transportation of soil are required. The estimated total excavation volume is 161,034 m³, including 97,404 m³ of ordinary soil and 63,660 m³ of contaminated soil. The transportation distance is approximately 1 km. All soil will undergo screening pre-treatment (the screen residue is calculated as 57,563 m³) before entering the thermal desorption treatment phase. 2. Core Construction Content: The project scope covers the entire process of "pretreatment - thermal desorption - secondary pollution prevention - supporting facilities", specifically including:
Pretreatment: Construction of a 900 m2 pretreatment greenhouse (including civil engineering, a 1.5 mm thick HDPE membrane barrier layer, lighting, and monitoring instrumentation). Soil crushing and screening equipment will be installed. 3% quicklime will be used for pretreatment agent dosing and mechanical mixing to adjust soil moisture content to meet thermal desorption process requirements.
Thermal Desorption: A complete set of indirect thermal desorption equipment will be introduced. This fully enclosed process of "feeding - thermal desorption - residue cooling - gas phase condensation - non-condensable gas purification and utilization" separates pollutants from the soil. The non-condensable gas will be purified and reused as supplementary fuel, while the condensed water will be separated by sedimentation.
Secondary Pollution Prevention: Measures such as bare soil covering, dust suppression with fog cannons, and foam inhibitors will be implemented throughout the process to prevent dust and harmful gas leakage during excavation, transportation, and thermal desorption.
Supporting Facilities: The electrical system within the self-built facility (including The project also includes ZA-YJV22 series cables, galvanized steel pipe installation, and grounding devices, as well as an automatic control instrumentation system (including 16 phosgene toxic gas detectors, 16 benzene toxic gas detectors, 5 area alarms, and a GDS gas detection and control system). All facilities will be dismantled as required upon project completion.
Indirect thermal desorption technology is employed to separate pollutants through non-contact heating. High-temperature flue gases generated by fuel combustion in the furnace uniformly heat the contaminated soil within the sealed kiln tube, separating moisture and volatile organic pollutants from solid particles in the soil in an anaerobic environment, thus preventing secondary oxidation and the generation of harmful gases. The separated solid residue is cooled and dust-removed before being discharged or reused in compliance with standards. The gaseous components are condensed and purified for resource utilization, ensuring no wastewater or exhaust gas is discharged. 1. High Efficiency: Precisely controlled thermal desorption temperature (adjustable to 300-500°C depending on pollutant type) achieves a removal rate of over 95% for high-concentration organic pollutants, with a short single-treatment cycle, meeting the large-scale, fast-paced disposal needs of the project.
2. Safety: The entire process is closed-loop, equipped with a GDS gas detection system for real-time monitoring of toxic gas concentrations. Multiple anti-seepage and anti-leakage measures are implemented in the pretreatment greenhouse and thermal desorption equipment areas to prevent secondary contamination.
3. Economical: Non-condensable gas is reused as fuel, and condensate is recycled, reducing energy and water consumption. Furthermore, the large-size gravel produced by screening can be transferred to an ex-situ leaching process for further disposal, maximizing resource utilization.
As a core component of the Wushihua slag site soil remediation project, this project not only directly addresses the challenging issue of high-concentration organic contamination in the soil, but also, through its proven and reliable ex-situ thermal desorption technology, provides a replicable and scalable technical paradigm for soil remediation at similar petrochemical slag sites. At the same time, the project will effectively improve regional soil environmental quality, eliminate soil pollution risks, help Urumqi Petrochemical Company achieve environmental compliance, and contribute significantly to ecological and environmental governance in the Xinjiang Uyghur Autonomous Region.
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