Orica is remediating the contaminated soil within the Car Park Waste Encapsulation (CPWE) using a treatment method known as Directly-heated Thermal Desorption (DTD). The DTD technology involves desorption, or separation/vaporisation, of contaminants from materials such as soil at temperatures typically in the range of 300 °C to 450 °C in a rotary dryer (view DTD Fact Sheet for further details).
The project has involved the construction of a DTD Plant and associated facilities within Botany Industrial Park (BIP) as shown in the figure below.
Location of the CPWE and proposed layout of the DTD Plant and facilities
Key infrastructure comprises:
- Excavation Soil Building (ESB)
- Built over the CPWE site in three stages to reduce dust, air and noise emissions associated with the remediation works
- Feed Soil Building (FSB)
- Where sealed trucks transport the excavated contaminated soil before it is fed into the DTD Plant
- DTD Plant
- Built adjacent to the FSB
- The contaminated material is treated here
- The plant is operating 24 hrs/day, 6 days/week, for approximately 9-10 months
- Water Treatment Plant
- Treating contaminated water recovered during the project or generated through truck wheel washing
- Emission Control Systems (ECS)
- Systems that are using carbon filtering to remove contaminants from the air in the ESB and FSB