Both applications offer significant benefits over other technologies currently available in the market place as they are fast, reliable, energy efficient, environmentally sustainable, inexpensive and safe.
In Situ Treatment of Contaminated Soils
STAR is an innovative in situ thermal technology based on the principles of smoldering combustion, where the contaminants are the source of fuel. The process is sustained by the addition of air through a well to the target treatment zone and is initiated through a short duration, low energy "ignition event." Once the process is initiated (ignited), the energy of the reacting contaminants is used to pre-heat and initiate combustion of contaminants in adjacent areas, propagating a combustion front through the contaminated zone in a self-sustaining manner (i.e., no external energy or added fuel input following ignition) provided a sufficient flux of oxygen is supplied. Active control of the combustion front is maintained by the oxygen supply. This efficient recycling of energy is made possible by the presence of the porous matrix (i.e., contaminated aquifer) that is being remediated. The technology is covered by patents - International PCT Filing PCT/GB2006/004591 and Granted Patents US 8,132,987 B2, CA 2,632,710, AU 2006323431 B9, JP4934832, and ZL 2006 8 0052554.X.
The above ground equipment used to implement the technology is similar to that used in Air Sparge (AS) / Soil Vapor Extraction (SVE) systems and includes compressors for sub-surface air delivery, blowers for ground surface vapor collection, and vapor phase activated carbon or a thermal oxidizer for vapor treatment. The specialized equipment associated with the STAR process includes the use of 2-inch diameter, carbon steel direct push ignition wells with a stainless steel screen, temporary in-well heaters to initiate the process, and subsurface multi-level thermocouple bundles to track the combustion process.
Ex Situ Treatment of Contaminated Soils and Liquid Organic Wastes
Savron's Ex Situ (STARx) treatment systems use the same patented process as the in situ STAR technology: smoldering combustion. The STARx process also uses a lot of the same "off-the-shelf" equipment as the STAR technology (compressors, blowers, vapor treatment), but is carried out in engineered soil piles placed on our HottpadTM systems. Hottpads are fully scalable and can be sized depending on treatment volume, available footprint, and treatment time requirements. These systems are ideal for stockpiles of contaminated soils, sites where surficial soils are contaminated, or for waste oils and sludges.