Smoldering Combustion (STAR and STARx) for the Treatment of Contaminated Soils: Challenges Encountered & Lessons Learned in Providing a New Remediation Technology to the Industry

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Poster:

Smoldering Combustion (STAR and STARx) for the Treatment of Contaminated Soils: Challenges Encountered & Lessons Learned in Providing a New Remediation Technology to the Industry

Presenter:  Gavin  Grant, Ph.D. (Savron)
Authors:  Gavin Grant, Ph.D., David Major, Ph.D., and Grant Scholes (Savron)

Abstract:

STAR (in situ) and STARx (ex situ) are innovative remediation technologies based on smoldering combustion where the contaminants are the source of fuel.     The first part of the presentation will focus on in situ applications of STAR and present a series of case studies.  The first case study involved the STAR treatment of two contaminated horizons (DNAPL and LNAPL) in a fine sand unit at a former Manufactured Gas Plant (MGP) Site in northern Michigan. Self-sustaining smoldering combustion was achieved in both zones resulting in a Radius of Influence (ROI) of approximately 8 feet with an average propagation rate of approximately one foot per day.  The second case study involved the first in-situ field application of a surrogate fuel (emulsified vegetable oil [EVO]) to support combustion of high volatility compounds including gasoline and diesel fuel at a former refinery in Michigan.  Successful injection and combustion of EVO resulted in an increased ROI as compared to the “standard” STAR test.  The third case study involved the STAR treatment of Navy Special Fuel Oil (NSFO) within a former tank farm area in Virginia.  The field test successfully treated contaminated soil located both above and below a discontinuous clay layer.    The second part of the presentation will focus on ex situ applications of STARx and present a cast study involving a full-scale HottpadTM system designed to treat hydrocarbon-impacted soils at a site in South East Asia.  HottpadTM systems are fully scalable, modular platforms containing the ignition infrastructure required to smolder soil piles place on top.  The case study will present data showing the simplicity, excellent treatment efficiency, and flexibility of the system to meet project-specific needs.    Lessons learned from field applications of STAR will be presented, focusing on common issues encountered at MGP sites and methods recently developed for maximizing treatment efficiency.

 

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