Techno Business Units

  • ANOXKALDNES
  • AQUAFLOW
  • BIOSOLIDS
  • BIOTHANE
  • EVALED
  • HYDROTECH
  • IDRAFLOT
  • IDRASCREEN
  • PMT

THERMAL SOIL REMEDIATION

Technology you can trust

Thermal conduction is the only heating technology that can heat the subsurface from low to high temperatures

First we listen

First of all it is important for us to understand your site and challenges. Only when we have the clear picture of your needs we are able to tailor the right solution for you to successfully manage your risk and solve your challenges.

 

Then we deliver robust and highly predictable results

We do believe that to succeed in giving the client the best service and value for money it’s not only technology but also the need of excellence in all phases of the remedy from design to execution and management.

 

We strive to perform efficient soil and groundwater remediation of contaminated land in strong and confident building relationships with our clients and business partners

Contact

Sales and Product Manager, Soil Remediation,
Niels Ploug
[email protected]
Tel.: +45 2048 5963 

Our vision

To be known worldwide as the leading and most qualified provider of in-situ thermal remediation of contaminated land


 

REFERENCES SHOWS THE VALUE OF THE TECHNOLOGY

As for our online treatment transparency we also believe that well documented references are a must for the serious thermal remediation. Since there is no industry standard for the references we “invented” our own. All remediation data is stored the VSurvey database and hence is ready at your fingertips to support the written reference sheets.

 

We are capable of supplying references for a lot of situations and contaminants ranging from indoor/outdoor installations, TCH and TCH/SEE combinations as well as low and high boiling compounds such as Trichloroethylene to Dioxin.

 

Our corporation with TerraTherm Inc. also gives us a huge reference background in different settings and applications.

 

  • Thermal remediation near residential area and graveyard

In a residential area in Reerslev, Denmarka vast mass of contamination of Tetrachlorethylene(PCE) was found.

To ensure an effective removal of DNAPL, 147 heaters were placed from ground level and down to 10-12 m, corresponding to at least 2 m deeper than the hot spot contamination in the whole treatment area.
 

  • Remediation beneath industrial laundry

Beneath a functioning industrial laundry, significant pollution with free phase PCE and other chlorinated solvents was discovered.

The site was operated without any nuisance and we were capable of maintaining pneumatic and hydraulic control. Target temperatures were reached within the treatment area.
 

  • Thermal Soil Remediation of PCE a active dry cleaning facility

The contamination was situated beneath a dry cleaning facility which activities had to remain in operation throughout the whole remediation period.

Combining two thermal remediation technologies in this project was the optimal way to achieve complete source-zone cleanup of both the clay.
 

  • Remediation in a small residential area

Part of the hotspot area was placed beneath a small pond and very close to both residential houses and to a transformer producing company.

Based on results from an ISTD pilot test in the hot spot area a decision was made regarding groundwater control. To be sure to prevent problems with incoming water a sheet pile were driven 8 m below ground surface around the whole treatment area.
 

  • Beneath building with stringent cleanup criteria

This TCE contaminated site located in the outskirts of Copenhagen posed multiple challenges.

To manage the clients risks and perform a safe and predictable remediation we chose Thermal Conduction. The technology is extremely flexible and heater wells do not need to be installed in an exact pattern enabling us to handle potential even odd sized enlargements of the treatment area.

 

  • Depth discrete remediation of clay till

On a site that housed a reloading station for chemicals in the 1970s, heavy pollution by PCE, TCE and 1,1,1 TCE was discovered in a clay till layer.

A total of 24 heater elements were installed in the depth interval between 3.5 and 13 mbgs. A PE liner was installed at ground surface to minimise infiltration of rainwater.

Heat it all the way

A key to success within thermal soil remediation is the ability to apply heat in a thorough, robust and predictable way. If you are not able to “heat it all the way” the chances for failure is increasing. For that reason we have chosen to work with two main technologies:


 

  • Thermal Conductive Heating (TCH)

In all its simplicity it is about transferring energy into the subsoil by thermal conduction. Heating of all kind of soils are highly predictable and efficient because the thermal conduction for the entire range of soils is almost equal. This allows uniform heating and effective remediation of fine-grained material like clay, silt as well as inhomogeneous deposits and even bedrock.

 

Thermal conduction this is the only heating technology that can heat the subsurface from low to high temperatures and hence treat a very broad specter of contaminants from VC to PAH, PCB and Dioxin.

 

Using electrical powered heater elements installed in traditional steel borings we are able to supply these with energy from renewable sources like wind- or hydro energy. Furthermore the electrical system deliver the energy to the subsurface with almost 100% efficiency.

 

We have since 2006 chosen to work with TerraTherm Inc. using their patented heating technology. We believe that TerraTherm’s approach to the thermal soil remediation is in line with our vision.

 


 

  • Steam Enhanced Extraction

At some sites there are portions of the sites that are very permeable and water yielding.

Whenever sites have high water yielding aquifers there might be challenges with reaching the treatment temperature because the flowing water removes more energy than injected. This is where we either use or supply the heating techniques with Steam Enhanced Extraction (SEE).

 

With SEE it is possible to inject significant more energy from fewer wells. With SEE you are even capable of creating a steam bubble that stops water from flowing into the treatment zone. Since SEE relies on hydraulic conduction it is more challenging and hence it is important to have the expertise and knowledge with hydrogeology to design and implement the technology. Combining TCH and SEE gives the most robust and successful thermal remediation approach capable of handling almost all situations.


 

IS THERMAL REMEDIATION THE RIGHT SOLUTION FOR MY SITE?

Almost any site containing organic contaminants can be treated with thermal soil remediation to stringent cleanup criteria in contradiction to many other in situ technologies relying on hydraulic permeability. However a lot of sites do not require thermal remediation to reach the site specific goals and hence less effective technologies can be implemented.

Downloads

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THERMAL SOIL REMEDIATION Brochure (EN) (952.84 KB)
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FAQ (EN) (82.38 KB)
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Case Study - Odense (458.5 KB)
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Case Study - Skuldelev (259.93 KB)
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Case Study - Reerslev (552.19 KB)
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Case Study - Taastrup (242.5 KB)
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Case Study - Pilehøj Vænge (154.25 KB)

Due to the speed of thermal soil remediation it is essential to monitor performance and compare against design values and expectations. This means collecting large amount of data from online sensors, field- and lab measures etc. To handle all these data and give a perfect overview we have developed the VSurvey suite of software solutions.

 

VSurvey collects all data no matter of origin in a cloud based database. This gives the user the ability to plot all measured data against each other and hence understand the different trends and see any related connections between data.

 

With just an internet connection our clients and consultants can gain access to this power full tool. We called it transparent remediation.