The costs of thermal desorption cannot be stated as a flat rate per tonne, because every remediation project is individual. The type and concentration of contaminants, material properties, delivery quantities, and the required documentation effort determine the actual treatment workload and therefore the price. The following questions highlight the most important cost factors and help you estimate a realistic budget for your project.
What factors determine the price of thermal desorption?
The price of thermal desorption is determined by several project-specific factors: the type and concentration of contaminants, the physical properties of the material, delivery quantity, required pre-treatment, and the effort involved in analysis and documentation. None of these factors operates in isolation — they influence each other and together determine the actual treatment effort.
Material properties are particularly relevant. Wet, clayey, or heavily compacted soil requires more intensive mechanical pre-treatment and longer residence times in the rotary kiln. This increases energy consumption and therefore treatment costs. Dry, granular material, on the other hand, can be processed more efficiently.
Delivery quantity also plays an important role. Larger batches enable more efficient plant utilization and can reduce the specific cost per tonne. Smaller individual deliveries with high logistics requirements, by contrast, drive costs up.
Transport costs add to this, varying considerably depending on the distance to the treatment site. Especially for large quantities, logistics make up a significant portion of total costs. Early coordination on delivery quantities, scheduling, and material characteristics is therefore crucial for a realistic cost estimate.
How does the type of contaminant affect treatment costs?
The type of contaminant directly influences the treatment costs of thermal soil treatment, because different contaminants require different treatment temperatures, residence times, and exhaust gas cleaning stages. The more complex or hazardous the contaminant mixture, the more demanding and cost-intensive the treatment.
Volatile hydrocarbons such as BTEX or TPH can be efficiently desorbed at moderate temperatures. Less volatile or particularly persistent compounds such as PCDD/PCDF, PCB, or PFAS require higher temperatures — up to approximately 600 °C depending on the material and contaminant load — as well as multi-stage exhaust gas cleaning with thermal afterburning, flue gas scrubbing, and activated carbon filters. This additional effort is directly reflected in the price.
Mixed contaminations, where multiple contaminant classes occur simultaneously, are particularly demanding. Here, the plant must be designed for the most critical contaminant profile in each case, which increases energy input and the effort required for exhaust gas treatment. Mercury (Hg), for example, requires specific separation processes that go beyond standard treatment.
A comprehensive contaminant analysis before the start of the project is therefore essential for a well-founded cost estimate. Without reliable analytical values, no serious quotation can be prepared.
What do analysis and documentation cost in a remediation project?
Analysis and documentation are an integral part of every remediation project and incur independent costs that must be factored into the overall budget. The scope is determined by regulatory requirements, contaminant complexity, and project size. Typically, it includes initial analysis, accompanying sampling, and final reports.
The initial analysis serves to characterize the source material. It forms the basis for technical planning and is a prerequisite for approval to accept the material at the treatment facility. Depending on the contaminant spectrum, extensive laboratory investigations may be required, which can take several weeks.
Accompanying quality controls are legally required during treatment. These include emissions measurements at the plant as well as analyses of the treated material to demonstrate compliance with limit values. This documentation is not only a regulatory obligation but also legally protects the client.
Final reports and disposal certificates round off the documentation. Particularly for complex contaminated site projects with regulatory oversight, the documentation effort can be considerable. It is advisable to discuss this item transparently during the quotation phase to avoid surprises later.
When is thermal desorption worthwhile compared to landfilling?
Thermal desorption is worthwhile compared to landfilling whenever the contaminated material cannot be landfilled, or can only be landfilled with restrictions, due to its contaminant load, when landfill space is scarce, or when recovery of the treated material is the goal. In the long term, treatment can be more economically favorable than a permanent landfill solution.
Many heavily contaminated soils cannot be landfilled without further action under current waste legislation. They must either be pre-treated or taken to special landfills, whose capacities are limited and whose costs have risen considerably in recent years. Thermal treatment converts the material into a recoverable state that can be used as a recycled construction material.
A further advantage of thermal desorption lies in the finality of the solution. Contaminants are destroyed or permanently removed from the material, not merely contained. This eliminates long-term liability risks for property owners and clients that can persist with landfilling.
When deciding between the two methods, transport routes, landfill status, recovery options for the treated material, and legal requirements should be considered in addition to direct treatment costs. A comparison based on the overall project is more meaningful than a pure price comparison per tonne.
How is a realistic cost quotation for thermal desorption determined?
A realistic cost quotation for thermal soil treatment is produced on the basis of a complete material characterization, a clear quantity plan, and early coordination between the client and the treatment facility. Without these foundations, any cost estimate carries considerable uncertainty.
The following information is required for a reliable quotation:
- Analytical results on the type and concentration of contaminants in the material
- Details on material properties (grain size, moisture content, foreign matter)
- Total quantity and planned delivery period
- Transport distance and logistics concept
- Regulatory requirements for documentation and verification
- Planned recovery or disposal of the treated material
Once this information is available, a treatment facility can prepare a well-founded quotation that transparently lists all relevant cost items. These include treatment costs, analysis, disposal of residues from exhaust gas cleaning, and, where applicable, interim storage. A reputable provider will not quote you flat rates but will tailor the offer to your specific material.
It is advisable to involve the treatment facility during the planning phase of a remediation project. This allows material quantities to be estimated realistically, delivery logistics to be optimized, and unexpected costs due to poor material quality or missing analyses to be avoided. Experienced providers know the typical pitfalls and can flag risks at an early stage.
How ARE Deutzen GmbH helps with the costs of thermal soil treatment
ARE Deutzen GmbH has specialized in the thermal treatment of contaminated mineral waste for over 30 years and supports clients in implementing remediation projects cost-efficiently and in compliance with the law. The many years of experience with complex contaminations enable a precise assessment of the treatment effort already during the quotation phase.
The range of services includes, among other things:
- Individual quotation preparation based on your analytical data and quantity planning
- Treatment of a broad contaminant spectrum, including TPH, BTEX, PAH, PCB, PFAS, Hg, and chlorinated hydrocarbons
- Mechanical pre-treatment and interim storage at the Deutzen site
- Complete material flow management including documentation and disposal certificates
- Transparent cost structure with no hidden items
- Certified waste management company with all required BImSchG permits
If you would like to know what thermal treatment costs for your specific project, get in touch directly. ARE Deutzen will prepare a project-specific quotation for you that transparently lists all relevant cost items. Submit an enquiry now and work together to develop the right solution for your contaminated site.