What Do the Costs of Thermal Soil Treatment Depend On?

The costs of thermal soil treatment depend primarily on the type and concentration of contaminants, the quantity of waste delivered, and the logistical effort involved. As a rough guide, treatment costs vary across a wide spectrum depending on the project configuration and must be calculated individually. The following sections explain the most important cost factors in detail.

Which factors influence the price most strongly?

The costs of thermal soil treatment are essentially determined by three main factors: the type and concentration of contaminants in the source material, the total quantity to be treated, and the effort involved in delivery, sampling, and regulatory documentation. Project-specific requirements such as interim storage or mechanical pre-treatment also add to the costs.

Every remediation project is unique. Soil with low contamination levels and a homogeneous composition can be treated more efficiently than a mixture of heavily contaminated fractions from different sources. The moisture content of the material also plays a role, as wet soils require more energy in the rotary kiln, which increases operating costs. Understanding the cost drivers allows for targeted countermeasures already at the project planning stage.

How does the type of contamination affect costs?

The type of contamination is one of the strongest price drivers in thermal soil treatment. Contaminants with low boiling points, such as TPH or BTEX, can be desorbed at comparatively low temperatures. High-boiling or persistent compounds such as PCDD/PCDF, PCB, or PFAS require higher process temperatures and more intensive exhaust gas purification.

Mixed contaminations, where several groups of contaminants are present simultaneously, are particularly complex. Mercury (Hg), for example, requires specific separation and purification steps that make the process more complex and therefore more costly. Cyanides, nitroaromatics, and chlorinated hydrocarbons also place special demands on the plant technology and multi-stage exhaust gas purification.

As a general rule: the higher the contaminant concentration and the more persistent the compounds, the more energy and plant effort are required, which is directly reflected in treatment prices.

What are the costs of delivery and logistical handling?

Logistics costs in the disposal of contaminated soil arise mainly from transport, packaging, and compliance with waste law documentation requirements. The greater the distance between the construction site and the treatment facility, the higher the transport cost share of the total price. For large quantities, rail transport can be more economical than road transport.

Additional costs arise from waste law declarations: contaminated soil is classified as hazardous waste and must be transported with consignment notes in accordance with the waste tracking regulations. The preparation of these documents, as well as the preliminary analysis of the material by an accredited laboratory, is mandatory and generates additional effort. Careful planning of transport logistics — for example, by consolidating loads or using suitable containers — can noticeably reduce costs.

Why do costs vary depending on waste quantity and project size?

Larger quantities of waste generally allow for a more favorable treatment cost per tonne, because fixed costs such as plant setup, analytics, and permitting effort are spread across more material. Small quantities of a few hundred tonnes are often more expensive per tonne, as the basic administrative and analytical effort remains the same.

For large-scale projects involving several thousand tonnes of contaminated material, framework agreements can be arranged that secure both delivery planning and treatment capacities on a long-term basis. Material flow management plays an important role here: structured control of material flows, including interim storage and sorting, creates planning certainty and can optimize overall costs. It is therefore worthwhile for civil engineering companies and industrial customers to consolidate projects as early as possible and plan them together with their disposal partner.

Which preliminary investigations are subject to fees and why are they necessary?

Prior to the acceptance of contaminated soil, preliminary investigations are legally required and technically indispensable. These include contaminant analyses by an accredited laboratory that determine the exact contaminant content, contaminant classes, and moisture content of the material. This data forms the basis for classification as hazardous waste and for calculating treatment costs.

The costs for sampling and analytics vary depending on the contaminant spectrum and number of samples. A simple basic analysis for TPH and PAH is significantly less expensive than an extended analysis package that also covers PFAS, dioxins, or mercury. Nevertheless, these preliminary investigations are not an avoidable expense but an investment in legal certainty: without reliable analytics, clients risk rejection at the facility, fines, or liability issues. Well-documented preliminary investigations also accelerate approval processes and shorten the project timeline.

When is thermal desorption worthwhile compared to other methods?

Thermal desorption is particularly worthwhile when contaminants cannot be completely destroyed by biological or chemical methods. This applies especially to persistent organic pollutants such as PAH, PCB, PCDD/PCDF, PFAS, or cyanides, which can be treated safely and verifiably using thermal processes. Thermal treatment is also frequently the only approved method for mercury contaminations.

Compared to landfilling, thermal soil treatment offers a decisive advantage: the treated material can be reused as a construction material or backfill after successful desorption, provided that contaminant levels comply with the applicable threshold values. This reduces the need for primary raw materials and saves landfill space. Although treatment costs per tonne are initially higher than simple landfilling, this difference often evens out when landfill capacities are scarce or disposal prices for hazardous waste are high.

For remediation projects at former industrial sites, gasworks, or military properties, where complex contaminant mixtures are the norm, thermal desorption is frequently the most economical and legally secure solution. ARE Deutzen explains more about how soil as a resource can be preserved through thermal treatment on its website.

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 since 1994 and offers civil engineering companies and industrial customers a complete one-stop solution. The foundation is a high-performance rotary kiln facility in Deutzen (western Saxony), where soils, construction rubble, and other types of waste are treated at temperatures of up to approximately 600 °C, depending on the material and contaminant load.

Specifically, ARE Deutzen supports clients with the following services:

Treatment of complex contaminations involving Hg, TPH, BTEX, PAH, PCB, PFAS/PFOS, PCDD/PCDF, cyanides, and other contaminants
Individual cost calculation based on contaminant analytics and project size
Assumption of material flow management including interim storage and mechanical pre-treatment
Handling of all waste law documentation obligations as a certified waste management company (EfB)
Transparent project planning with reliable capacity commitments even for large-scale projects

Anyone looking to calculate the costs of their soil disposal realistically and handle them in a legally secure manner is in the right place with ARE Deutzen. Get in touch now and request a no-obligation quote.