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Platform and poster sessions feature research, case studies, and the presentation of new programs. Exhibitions augment the conference program and bring applied technology to attendees. Focused workshops provide attendees with practical information for immediate application. Daily socials provide networking opportunities and discussion.
AEHS West Coast Conference
This Event is produced by Association for Environmental Health and Sciences Foundation, Inc.
The purpose of this report is to discuss a new, and economically viable, clean-up solution for small sites contaminated with BTEX and/or chlorinated solvents.
GRS is offering a Small Sites version of electrical resistance heating (ERH) as a remediation option for small, persistently impacted sites in the Pacific Northwest.
Recalcitrant Sites: Properties where a number of remediation technologies have been applied without achieving a pathway to site closure. Typically, soil matrix issues are causing contaminant rebound. Often, site owners would like to expedite clean-up to facilitate a property transfer.
New Sites with Tight Lithology: Smaller sites with tight glacial tills where clean-up activity has not started. These sites become ERH candidates when viewed on the basis of life cycle costs to achieving site closure. This is especially true for owners who want to shorten typical clean-up timelines and eliminate the risks of rebound Small Site Electrical Resistance Heating.
Source Area Treatment: Often, over 50% of on-site contaminant mass is found in small source areas. ERH can be used to effectively eliminate this mass while other technologies are deployed to treat the larger low-concentrating contaminant plume. Often, Small Site Electrical Resistance Heating can enhance the clean-up rate and effectiveness of other remediation technologies.
A Proven Technology: ERH was developed by Battelle NW Laboratories and has been commercialized for about 15 years. ERH clients include: Department of Defense; US EPA; State Regulatory Agencies; Fortune 100 companies; and regional industries.
Over 200 ERH projects have been completed in North America with contaminant reductions typically reaching 99.9+%. The target market for ERH is large, highly contaminated, industrial, and Superfund Sites.
A New Approach: GRS is redefining ERH to address the requirements of small sites. We are building Power Delivery Systems designed and sized specifically for smaller clean-ups. Downsizing power delivery systems allows the entire ERH process to be scaled to smaller sites. At some sites, portable ERH systems ca n be plugged into existing facility power supply.
Timeline: Even using portable power delivery systems, small sites can be cleaned within 6 to 8 months with about 60-90 days of heating. Heating is sufficient to remove the contaminant sources responsible for rebound.
Rebound: Rebound is an issue for all in situ remediation technologies except ERH. Caused by the non-uniform dispersion of treatment throughout the soil matrix. Technologies that rely on the movement of oxidants, or air, through saturated glacial tills are particularly prone to rebound.
Alternatively, ERH relies only on the flow of electrical current to simultaneously clean soil and groundwater. Because current flow is not affected by soil type, ERH produces uniform performance throughout the treatment volume, eliminating the risk of rebound after heating.
GRS recognizes that most small sites have limited funding for clean-up and often significant resources have already been spent on prior remediation efforts. Competitive pricing is a key component of our efforts to adapt ERH for the clean-up of small sites impacted with BTEX and chlorinated solvents.
GRS’ approach to pricing is based on reducing the costs under our control; spreading capital costs over multiple sites; and creating owner value through shortening remediation timelines and reducing risk.
Costs for gas station and dry cleaner clean-ups involving impacted groundwater range from $400,000 to $800,000 with timelines of 4 – 10 years. Sites with the potential for significant rebound issues can consume these budgets and still fall well short of achieving No Further Action Letters.
GRS’ Small Site Program targets this same budget range, with remediation time frames of approximately 6 – 9 months and the elimination of the risk of rebound.
Obtain free budget bids.
Global Remediation Solutions LLC (GRS) has completed the construction of the Emergency Mobile Water Treatment System (EMWTS) for the Clackamas River Water District (CRWD). The trailer system was built as per the specifications in the Formal ITB No. 115468 presented by the City of Portland, Oregon – Procurement Services.
The Emergency Mobile Water Treatment System was built to be a self sufficient closed unit that can be housed in a trailer to be pulled to any location to produce drinking water that meets the National Primary and Secondary Drinking Water regulations for organic, inorganic and microbial contaminants. This system was designed to draw from contaminated water sources and produce enough safe water to care for 10,000 or more people per day. The
responsiveness of the mobile on-site water purification unit ensures that clean water gets to those who need it and will compliment the existing Emergency Water Distribution Systems.
The design and equipment selection for the trailer system was provided to GRS. The main filtration units are the GE Home Springs Ultra Filters (UF) with pre-filters to remove sediments and particles down to 50 microns. The system was built with pumps and filters to provide 18 to 20 gallons per minute (GPM) for total flow through.
Electrical resistance heating is accomplished by passing an electrical current through the volume of subsurface soil requiring treatment. The process is equally effective in vadose and saturated zones. As the subsurface resists this flow of electricity, it is heated to the boiling point of the water/contaminant mixture present, regardless if the water source is soil moisture or a flowing aquifer. Following Dalton’s and Raoult’s laws, the temperature at which subsurface boiling occurs is dependent upon depth below the groundwater table, the type of contaminants present, and the ratio of contaminant concentrations. Increasing depth below the groundwater table and the presence of less volatile contaminants produces higher boiling points requiring increasing levels of energy consumption to reach remedial goals.
The temperatures created by Electrical Resistance Heating-ERH is sufficient to evaporate targeted contaminants and produce an in situ steam source by boiling soil moisture and groundwater. This steam than strips contaminates from the soil matrix and carries them to vapor recovery (VR) wells that may be co- located with the electrodes.
ERH brings the subsurface to boiling in a smooth and controlled manner. Because Electrical Resistance Heating-ERH needs soil moisture to remain above 5% to be successful, the technology cannot desiccate soil or cause subsidence. ERH electrodes do not become significantly hotter than surrounding soil and no excess energy is stored in the subsurface in the form of temperatures above boiling. If ERH application ceases for any reason, such as a site-wide power failure, steam generation in the subsurface stops quickly. For this reason, backup generators for vapor recovery and treatment systems are not a requirement for Electrical Resistance Heating-ERH remediation projects.
Once heating at an ERH site starts, pure contaminants boil first, then groundwater with high levels of dissolved phase contaminants, and finally clean groundwater. Thus, ERH specifically targets the most impacted sections of the subsurface, including non-aqueous phase liquids (NAPLs) and contaminants adhering to the soil matrix. Additionally, ERH cleans saturated soil without having to dewater it, eliminating the need for groundwater extraction, treatment, and disposal systems.
The type of contaminants and desired cleanup goals affect the energy, time, and cost to clean a given treatment volume. The two most important factors in evaluating the performance of ERH at a site are the level of total organic carbon (TOC) in soil and the presence of SVOCs such as heavy fuel hydrocarbons. Both of these substances hold CVOCs in the subsurface, making them more time consuming and expensive to remove regardless of the remediation technology deployed.
Global Remediation Solutoins (GRS) provides the best available environmental remediation solution for both large and small projects including sites dealing with multiple contaminants. GRS is experienced in a wide array of technologies including thermal, bioremediation and air movement. This technical knowledge base gives our clients the value of receiving the optimal solution through one provider.
GRS has developed its Electric Resistant Heating (ERH) technology to provide a complete, fast and energy-efficient solution for simultaneously treating solvents found in soil, groundwater, and pools deep below the groundwater table. ERH is often used to clean sites where other technologies have had limited success. ERH provides uniform subsurface heating, can be safely applied under buildings, and efficiently treats to depths of more than 100-feet below grade.
The GRS team includes experts in bioremediation, which may be used alone or coupled with other remediation technologies. For example, ERH is even more effective when coupled with bioremediation, either during heating or after heating as a final polishing step. Heat-enhanced bioremediation is a key step in developing a total plume solution.
Multi-contaminated sites can be effectively treated through our complete array of air movement technologies including SVE, DVE, MPE, air sparging, bio-venting, bio-slurping, recirculation wells, and hot-air injection. GRS employs mobile units to maximize space on sites with difficult access space limitations and on-going client operations.
GRS technical professionals can assist you determine the right and most complete technology solution for your next remediation project or property. Because each site’s subsurface geophysical and contaminant parameters vary, it’s best to start a dialog with GRS staff early in the remedial investigation/feasibility study phase.
Need a Quick ISTR Estimate? Have a site or project in mind with general detail on the treatment zone, volume, soil type, depth to groundwater and contaminants of concern? Go to our Quote Request Form and follow the simple and easy to use bid request process.
Or contact: Michael Dodson, email@example.com, (360) 423-2245
All information provided through our bid request process is considered confidential. Project and site data are used solely to perform a technology assessment and to develop accurate pricing.
To learn more about GRS and ISTR technologies, visit our home page.
Global Remediation Solutions (GRS) is an environmental remediation technology company focused on the design and construction of In Situ Thermal Remediation (ISTR) systems. GRS is part of the PNE Corporation family of companies. The size and diversity of the PNE companies, coupled with our highly respected environmental industry professional, allows GRS to pursue major remediation projects on a national basis.
In Situ Electrical Resistance Heating (ERH) is the most effective and efficient technology for the complete remediation of chlorinated solvents. Reaching clean-up goals in months, ERH addresses contaminated soil and groundwater with no rebound. ERH applications include both industrial and commercial sites, from large source areas to small dry cleaners.
Chlorinated solvents, such as PCE, TCE and their degradation products, persist in the subsurface because of their unique chemical and transport properties. After decades of operation, groundwater pump and systems have produced few, if any, site closures for these compounds. This leaves site owners with both persistently impaired property and on-going operation and maintenance costs.
ERH provides property owners a proven, fast, and complete remediation option that enables them to sell impacted property at full value or return it to productive use. The value produced by a quick and certain clean-up can be substantial for many properties.
GRS technical professionals can help you determine if ERH is a viable solution for your next remediation project. Because site conditions and contaminant parameters vary for every project, it’s best to start a dialogue early in the RI/FS process to determine if ERH is a fit for your site. We can also work with your staff to evaluate heat-enhanced bioremediation and heat-enhanced in situ chemical oxidization (ICSO).
Need a Quick Estimate? Have a site or project in mind with general details on the treatment volume, soil type, depth to groundwater, and contaminants of concern? Go to our quote formal request form and follow the easy to use bid request process.
Or contact: Michael Dodson, firstname.lastname@example.org , (360) 423-2245
All information provided through our bid request process will remain confidential. Project and site data are used only to perform a technology assessment and to develop accurate pricing.
To learn more about GRS and ERH, visit us our home page.
Global Remediation Solutions (GRS) is an environmental remediation technology company focused on the design and construction of in situ thermal remediation (ISTR) systems. GRS is part of the PNE Corporation family of companies. The size and diversity of the PNE companies, coupled with our highly respected environmental industry professionals, allows GRS to pursue major remediation projects on a national basis.
Electrical Resistance Heating-Multi-Phase Extraction-Pilot Studies
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