Redox Tech, LLC services

Redox Tech, an in situ soil and groundwater remediation firm, announces their improved amendment delivery method. The new method, in situ soil blending, will revolutionize the remediation market place. Redox Tech is already a recognized leader for development of soil and groundwater remediation amendments. The new delivery method complements Redox Tech formulation expertise and overcomes one of the major obstacles for in situ remediation, namely effective and uniform delivery of the reagents. In situ soil blending has numerous advantages over conventional dig-and-haul and in situ injection approaches:

 Efficient and uniform delivery of remediation amendments, such as oxidants, reductants, and biostimulants
 Production rates comparable to dig, haul and backfill
 No long term liability associated with disposal at a landfill – no future PRP liability
 No liability associated with transport of hazardous waste
 Costs that are 2 to 10 times less expensive than dig and haul, depending upon the type and level of contamination
 No RCRA TSD permits are required because remediation is completed within the “area of contamination”
 Can treat a wide range of compounds, such as chlorinated solvents, pesticides, PCBs, PAHs, among other

Redox Tech injects superheated water which flashes into low quality steam upon entrance to the subsurface. Superheated water is the one of the most efficient common carriers of heat (i.e. compared to steam and air). Redox Tech utilizes steam for two main purposes. One purpose is to reduce the viscosity of free product, either LNAPL or DNAPL, so that it can be recovered more efficiently. The low-quality steam also helps to displace the less viscous free product.

The second purpose involves heating the subsurface environment to thermally catalyze sodium persulfate. A total organic carbon (TOC) test is completed with sodium persulfate at 60 C for the oxidant. By thermally activating the persulfate, we can complete an in situ TOC test and destroy a wide range of organic compounds in place.

It is a common misconception that thermal technologies are extremely expensive. For illustrative purposes, the fuel cost to heat one ton of soil by 10C is provided below.

Ø      One ton of saturated soil, 30% total porosity requires approximately 15,000 BTUs to raise 10C

Ø      One gallon of diesel contains approximately 135,000 BTU

Ø      Fuel costs are less than $1 per ton for thermal activation

As a rule-of-thumb estimate, the total cost to heat soil 10C is roughly $5 to $10 per ton, depending upon such factors as soil type, depth, availability of water, etc. The cost of each additional 10C increase is roughly $2 to $3 per ton. A spreadsheet is provided below which allows one to estimate the heat required to heat soil and water in situ. Also, a list of sites where steam activated persulfate has been applied is provideds