SRS® Family of Patented Emulsified Vegetable Oil Substrates Combined with Zero Valent Iron (ZVI) for Anaerobic and Abiotic In-Situ Remediation
Emulsified Vegetable Oil Substrates combined with Zero Valent Iron (ZVI) provide cost-effective solutions for a number of complex and challenging environmental remediation problems including dense non-aqueous phase liquids (DNAPLs) like tetrachloroethene (PCE) and trichloroethene (TCE). The technology is a combination of abiotic and biotic reductive dechlorination methods. Both methods have been proven to work in numerous remediation sites.
SRS®-ZVI is a combination of ZVI, biodegradable soybean oil, surfactants, sodium lactate, nutrients, and water that form a stable emulsion. The Terra Systems SRS®-ZVI products contain a shear thinning agent, which under pressure thins the SRS®-ZVI out for ease of injection and improved radius of influence.
SRS®-EZVI is a combination of ZVI, biodegradable soybean oil, and surfactants that form a stable particle (or micelles) that contain ZVI particles in water surrounded by an oil-liquid layer. The exterior oil layer has similar hydrophobic properties as chlorinated compounds. Therefore, the emulsion attracts the contaminants and pulls them into the interior reactive zone for degradation. This product is intended primarily for treating DNAPL and high concentrations of the chlorinated solvents.
Because of our manufacturing capability, Terra Systems has the broadest EVO/ZVI product line in the industry, which allows our customers to specify the percent and particle size of the ZVI based on their site conditions and remediation goals. Terra Systems has licenses for US Patents 7,531,709 and 7,037,946 B2 for the combination of ZVI and carbon substrates. Our prices for SRS®-ZVI and EZVI include royalties under those patents for the manufactured ZVI and substrate we provide. Injection of additional ZVI or substrate into the same treatment area where SRS®-ZVI or EZVI was injected may incur additional royalty payments.
| Product | Differentiation | Application | Benefit | Technical Data Sheet | Safety Data Sheet (SDS) |
|---|---|---|---|---|---|
| SRS®-ZVI (4 µm ) | Patented SRS® EVO combined with 4 µm microscale ZVI | Anaerobic and abiotic reduction of DNAPL chlorinated solvents and Freon 113 and PRBs | Can be injected via DPT. Improved radius of influence and longevity over other carbon/ZVI combinations | SRS-ZVI (4 um) Technical Data Sheet | SRS-ZVI (4 um) SDS |
| SRS®-ZVI (<44µm ) License for US Patent No. 7531719 | Patented SRS® EVO combined with <44 µm microscale ZVI | Anaerobic and abiotic reduction of DNAPL chlorinated solvents and Freon 113 and PRBs | Can only be injected via DPT. Can incorporate higher percentage of ZVI with less impact on cost. | SRS-ZVI (44 um) Technical Data Sheet | SRS-ZVI (44 um) SDS |
| SRS®-ZVI (<125µm ) | Patented SRS® EVO combined with <125 µm microscale ZVI | Anaerobic and abiotic reduction of DNAPL chlorinated solvents and Freon 113 and PRBs | Can only be injected via DPT. Can incorporate higher percentage of ZVI with less impact on cost. | SRS-ZVI (125 um) Technical Data Sheet | SRS-ZVI (125 um) SDS |
| EZVI | Combination of soybean oil, surfactant, water, and fine microscale (2 & 4 µm) ZVI | Anaerobic and abiotic reduction of DNAPL chlorinated solvents and Freon 113 and PRBs | Can be injected via wells or DPT but DPT should provide a greater radius of influence because of the higher injection pressures.. Improved radius of influence and longevity over other carbon/ZVI combinations | SRS-EZVI Technical Data Sheet (2020-01F) | SRS-EZVI SDS |