Small Site Electrical Resistance Heating
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.
Three Target ERH Applications
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.
Proven Technology, Rapid Clean-Up, and No Rebound
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.
Competitive Pricing for Small Site Electrical Resistance 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.
- Capital Cost: GRS power delivery systems are designed and built in-house, removing all markups.
- Energy Efficiency: Advanced GRS designs are 10-15% more energy efficient than conventional ERH power delivery systems.
- 480 volts: Where possible, GRS operates its small power systems at standard voltages to reduce the costs of power drops and electrical connections.
- Mobile Systems: Housed in custom made 20-foot equipment trailers, GRS systems can be driven directly to Pacific Northwest project sites.
- Local Support: The size and diversity of our Pacific Northwest resources gives GRS access to large pools of specialty equipment, skilled and flexible staffing, and shared overhead and administration costs.
- Capital utilization: Provide clients who sign multiple site packages reductions on equipment rent as GRS allocates capital costs across the package sites.
- Heat management: GRS deploys direct heating only for the period required to achieve the desired results in the heated zone and then re-uses that heat a second time for enhancing supplemental treatment such as bioremediation and ISCO.
Typical Small Site Costs
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 Electrical Resistance Heating Costs
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.
Tags: btex, chlorinated solvents, Electrical Resistance Heating, ERH, no rebound, northwest, rebound, Recalcitrant Sites, Small Site Electrical Resistance Heating, small sites, Source Area Treatment, Tight Lithology