How much will it cost to remediate my site?

Enhanced reductive dechlorination is based on attaining and maintaining control of an aquifer for a period of time sufficient to degrade all constituents of concern and their daughter products. Attaining and maintaining control of an aquifer is highly dependent on the hydrogeology and geochemistry of the site along with the microbial populations present. Since the hydrogeology and geochemistry is different for every site, a blanket cost can not be given for any specific site. In general, enhanced reductive dechlorination will cost less than $10 per cubic yard of media treated on most non-DNAPL sites. This compares with about $60 per cubic yard for excavation (without disposal) and about $90 per cubic yard for chemical oxidation.

Can I reach MCLs with enhanced reductive dechlorination?

In some cases, MCLs can be attained with enhanced reductive dechlorination. Much more frequently, reductions in contaminant mass of one to two orders of magnitude are common.

Do the costs include freight?

Because freight is costed from a warehouse to a delivery point, freight costs are quoted separately. Unless otherwise stated, due to the volatility of the fuels market, freight costs are generally valid for 30 days. Consideration should be given to the receiving facility’s capacity to off load a truck. In situations where the product is delivered to a facility without the capacity to off-load a delivery vehicle, arrangements can be made (for an additional charge) for delivery on a vehicle with a lift gate and pallet jack.

When do I need to reinject?

Reinjection schedules should be based on the geochemistry of an aquifer and not on a calendar schedule. In many cases, multiple injections can be spaced further apart over time.

Will reductive dechlorination work in tight clay?

Since the main goal of adding a substrate to an aquifer is to attain and maintain anaerobic conditions for an extended period of time, because of the limited flows clay sites should be ideal for enhanced reductive dechlorination. In practice, clay sites with adequately spaced injection points usually show very rapid response to substrate addition.

What should my injection spacing be?

Injection spacing should be sufficient to promote robust reductive dechlorination throughout the treatment zone for a time sufficient to attain complete reductive dechlorination. Injection spacing is dependent upon the dissolution rate of the substrate, the dosage, aquifer velocity, and competing electron acceptor and contaminant flux.

Wilclear Plus® | JRW Bioremediation

SAY GOODBYE TO YOUR CHLORINATED
CONTAMINANTS

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REFERENCES

In Situ Treatment of Chlorinated Ethenes at the Treasure Island Site 24 Source Area

Michael Yurovsky, P.E. (Shaw E&I) and Scott D. Anderson (NAVFAC), Seventh International Conference Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California; May 24-27, 2010

Direct Injection In Situ Bioremediation at Site 21 Treasure Island, California.

Wayne Akiyama (Shaw E&I), Nathan Kong (Shaw E&I), Michael Yurovsky (Shaw E&I), and Scott Anderson (Navy Base Realignment and Closure [BRAC]

Program Management Office); Seventh International Conference Remediation of Chlorinated and Recalcitrant Compounds, Monterey, California; May 24-27, 2010

Fun Facts

Dehalococcoides ethenogenes strain 195 uses only H2 as an electron donor and chlorinated compounds as electron acceptors to support growth. In culture, it also requires acetate, vitamin B12, and extracts of mixed microbial cultures as nutrients (Seshadri et al. 2005 Genome Sequence of the PCE-Dechlorinating Bacterium Dehalococcoides ethenogenes, Science, vol 307, pg. 105-108).

Wilclear Plus^® demonstrated faster dechlorination kinetics than other substrates.

At 25 days, the Wilclear Plus^® microcosm converted more than 99% of PCE to ethene.

Sodium lactate (wt/wt): 29-35%
Sodium propionate (wt/wt): 0-8%
Sodium acetate (wt/wt): 0-8%
Sodium butyrate (wt/wt): 0-8%
Carbohydrates/metabolites (wt/wt): 21-25%

Nominal percent fermentable: 61%
pH: 7 ± 1.0
Viscosity: 500 – 1000cP at 20° C
Specific gravity: 1.2 – 1.3
Soluble in water
Color: light to dark brown

Handling

Store unopened under dry conditions at temperatures between 35°F and 85°F.
Shelf life of unopened product is 1 year
Diluted product should be used within 5 days to avoid microbial growth and activity which may cause gas buildups in containers and visible growth which may foul equipment.
Following injection of material, wells should be flushed with clean water to prevent microbial growth.
Equipment decontamination should follow site specific requirements.

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