Soil Remediation and Treatment Project of Urumqi Petrochemical's Slag Yard in 2022
Project Introduction:
This project is based on the overall plan of the 2022 Urumqi Petrochemical Slag Field Soil Remediation and Treatment Project, focusing on the soil pollution problem in the slag field and surrounding areas of Midong District, Urumqi City, Xinjiang Uygur Autonomous Region. The aim is to complete environmental supervision tasks through specialized remediation technology, and achieve harmless and resourceful disposal of polluted soil. Among them, our company undertakes the high concentration soil ectopic heat desorption disposal project, which is the core link with high technical difficulty and large disposal scale in the overall project, and plays a key supporting role in the overall restoration effect of the project.
The core objective of the project is to remediate high concentration organic polluted soil to the remediation target values required by the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standards (Trial)" (GB 36600-2018) and project requirements. Specific pollutants such as phenol ≤ 90mg/kg, benzene ≤ 4mg/kg, petroleum hydrocarbons ≤ 4500mg/kg, etc., ensure that the remediated soil meets the subsequent safety utilization needs.
1. Disposal scale: This project requires the remediation of 57563m ³ of high concentration organic contaminated soil, covering 18129m ³ outside the slag yard and 39434m ³ inside the slag yard. Due to the use of in-situ thermal desorption technology, excavation and transportation of soil need to be carried out first. The estimated total excavation volume is 161034 cubic meters, including 97404 cubic meters of ordinary soil and 63660 cubic meters of contaminated soil, with a transportation distance of about 1 kilometer. All soil needs to be screened and pre treated (with a screening residue of 57563 cubic meters) before entering the thermal desorption process.
2. Core construction content: The project scope covers the entire process of "pretreatment thermal desorption secondary pollution prevention and control supporting facilities", including:
Pre treatment stage: Construct a 900 square meter pre treatment greenhouse (including civil engineering, 1.5mm thick HDPE film anti-seepage layer, lighting, and monitoring instruments), equipped with soil crushing and screening equipment, using 3% quicklime for pre treatment agent addition and mechanical mixing, adjusting soil moisture content to meet the requirements of thermal desorption process;
Thermal desorption treatment: A complete set of indirect thermal desorption equipment is introduced, which separates pollutants from soil through a fully enclosed process of "feeding heating desorption residue cooling gas phase condensation non condensable gas purification and utilization". The non condensable gas is purified and reused as supplementary fuel, while the condensed water is separated by sedimentation;
Prevention and control of secondary pollution: measures such as bare soil covering, fog gun dust suppression, use of foam inhibitor, etc. shall be taken throughout the process to prevent dust or harmful gas leakage during excavation, transportation and thermal desorption;
Supporting facilities: self built electrical system (including ZA-YJV22 series cables, galvanized steel pipe laying, grounding devices, etc.) and automatic control instrument system (including 16 phosgene toxic gas detectors, 16 benzene toxic gas detectors, 5 area alarms, and 1 GDS gas detection control system), all facilities will be dismantled as required after the project is completed.
Using indirect thermal desorption technology, pollutant separation is achieved through "non-contact heating": the high-temperature flue gas generated by fuel combustion in the furnace is used to uniformly heat the polluted soil in the closed kiln, and the moisture, volatile organic pollutants, and solid particles in the soil are separated in an anaerobic environment to avoid harmful gases from secondary oxidation. The separated solid residue is discharged or reused after cooling and dust removal, and the gas-phase components are condensed and purified to achieve resource utilization, with no wastewater or waste gas discharged throughout the process.
1. Efficiency: Precise control of thermal desorption temperature (adjusted to 300-500 ℃ according to the type of pollutant), with a removal rate of over 95% for high concentration organic pollutants, a short single disposal cycle, and meeting the large-scale and fast-paced disposal needs of the project;
2. Safety: The entire process operates in a closed manner, equipped with a GDS gas detection system to monitor the concentration of toxic gases in real time. Multiple anti-seepage and leak prevention measures are set up in the pre-treatment greenhouse and thermal desorption equipment area to prevent secondary pollution;
3. Economy: Non condensable gas is reused as fuel, and condensed water is recycled to reduce energy consumption and water resource consumption; At the same time, the large particle size gravel produced by screening can be transported to the ex situ leaching process for further disposal, achieving maximum resource utilization.
As a core component of the soil remediation and treatment project for the Urumqi Petrochemical slag yard, this project not only directly solves the "hard bone" problem of high concentration organic pollution soil, but also provides a replicable and promotable technical paradigm for soil remediation of similar petrochemical slag yards through mature and reliable ex situ thermal desorption technology. At the same time, the implementation of the project can effectively improve the quality of regional soil environment, eliminate soil pollution risks, assist Urumqi Petrochemical Company in achieving environmentally compliant operation, and contribute important strength to the ecological environment governance of Xinjiang Uygur Autonomous Region.
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