Tag Archives: Steam Enhanced Extraction

Webinar: Steam Enhanced Extraction – The tricky thermal solution for permeable sites

In case you missed our last installment of “Inside In Situ Thermal Remediation”, TerraTherm’s informational webinar series, you can find a recorded version here: “Steam Enhanced Extraction – The tricky thermal solution for permeable sites” Presented by TerraTherm’s Senior Vice President and Chief Technology Officer, Dr. Gorm Heron. Description: This presentation focuses on the oldest In Situ Thermal Remediation (ISTR) technology, Steam Enhanced Extraction (SEE).  It is vastly different from the other ISTR methods used, in that steam is generated above-ground and injected through wells, heating the ground while displacing fluids as the steam zone grows.  Since steam tends to … Continue reading

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Steam Injection Helps – How do we know when to use it?

The subsurface is complex – it may have layers of sand, silt and clay, and some layers have groundwater while others do not. When chemicals are spilled they move down into the subsurface via the paths of least resistance, contaminating all the zones they pass through. So when the distribution of materials and chemicals into the subsurface is this complex, would you think that one heating technology would fit all sites? TerraTherm’s answer is “of course not!” One has to first understand the site well, and then determine the best way to heat a site and how to best extract … Continue reading

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Thermal Treatment of Fractured Rock – How is it Different?

Fractured rock sites are different – often it is difficult even to determine how deep the Non-Aqueous Phase Liquid (NAPL) has gone, and to define what we refer to as the “source area”. Some sites have NAPL in the fractures, and some have most of the mass trapped in the matrix, into which it has diffused over decades. This blog post discusses the two main challenges: How to decide on the thermal treatment volume without making the problem worse. How to design and implement an effective and safe thermal system. For any aggressive source treatment to be cost-effective, it is … Continue reading

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Webinar: Thermal Remediation of LNAPL

In case you missed our last installment of “Inside In Situ Thermal Remediation”, TerraTherm’s new informational webinar series, you can find a recorded version here: The focus of this presentation was to provide an overview of thermal treatment options for LNAPL-contaminated sites, and will cover: Thermal remediation progress over the last 10 years, Similarities between In Situ Thermal Remediation (ISTR) and thermally enhanced oil recovery, LNAPL remediation case studies, and A large LNAPL spill case – using the energy in the recovered fuel to power remediation and obtain sustainable clean-up. TerraTherm uses all three main thermal technologies: Steam Enhanced Extraction, … Continue reading

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Which Thermal Technology is Right for your Site?

So you’ve done your homework and feel that thermal may be a good fit for your site.  Now it’s time to determine the thermal technology or combination of technologies that will best accomplish cleanup goals.  There are three predominant thermal technologies in the industry:  Steam enhanced extraction (SEE); resistive heating in the form of electrical resistive heating (ERH); and thermal conduction heating (TCH), which combined with vacuum extraction is known as in-situ thermal desorption (ISTD).  When selecting a thermal technology the following key items need to be understood: Boiling points, vapor pressures, and water solubility of the contaminants: For volatile … Continue reading

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Why Data Management is the Most Underrated Aspect of Thermal Remediation Operations

There are those who think data management sounds boring.  What could be less stimulating than numbers in columns and rows?  But to anyone who needs to know exactly what is going on in the soil, these data are about the most interesting and exciting news around.  No, I’m not saying that us soil nerds are easily amused, I’m saying that those process numbers and field data reveal trends that tell a detailed story and provide actionable information that may streamline the path to completion.  When it comes to optimizing a thermal remediation project, data management, along with a lot of … Continue reading

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The High Value of Thermal Treatability Studies

Laboratory treatability studies are often one of the first logical steps when considering In Situ Thermal Remediation (ISTR) at a given site. In relation to the full-scale source remediation, treatability studies can be a wise and relatively low cost investment in a proof of concept. You might begin with a lab study if you have a unique mix of target compounds in the treatment area, or a challenging geological matrix. Or perhaps certain stakeholders need some extra “convincing” that ISTR will work at your site.  A study performed on actual site materials can quantitatively demonstrate the effectiveness of various thermal … Continue reading

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Where Did In Situ Thermal Remediation (ISTR) Methods Come From?

Looking at a built-up thermal site with heaters, wells, manifold piping, process gear, and the advanced monitoring systems which can be accessed from anywhere in the world, it can be tempting to wonder how this all came about…  Hundreds of engineering details, program logic controlling automatic operation of valves, heating systems, and treatment equipment.  Yet, the systems run overnight and on weekends, with nobody there to baby-sit them.   Most of the features of a modern In Situ Thermal Remediation (ISTR) site have evolved over a period of less than 25 years.  I will try to explain the evolution here. Chemicals … Continue reading

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