Oxygen Release Compound
Oxygen Release Compound (ORC) is a proprietary formulation of phosphate-intercalated magnesium peroxide sold by Regenesis Bioremediation Products used for soil and groundwater remediation. There is a newer version of the ORC called Oxygen Release Compound Advanced (ORC-A). When hydrated, it produces a controlled release of oxygen for periods of up to 12 months on a single application. ORC releases up to 10% of its weight as molecular oxygen and is used to accelerate the rate of naturally occurring aerobic contaminant biodegradation in groundwater and saturated soils. This available oxygen is utilized by indigenous microbial populations to naturally degrade contaminants into harmless end products like CO2 and water.
Some of the field applications for ORC are:
1. Injectable slurry for source area and permeable reactive barrier applications.
2. ORC and water mixture (slurry) application in excavations.
3. Dry powder application in soils and excavations.
4. Replaceable filter socks for single well and barrier applications.
Because it is intended to promote bioremediation, the limited amount of oxygen it provides to the subsurface is less effective on higher contaminant concentrations. ORC is not recommended for use to treat heavily-impacted source areas.
ORC will not be effective on free product due to the stoichiometric demand that it represents. A form of mechanical removal such a dig and dump would be a better option.
Some of the benefits of ORC are:
1. Long-term source of oxygen to the subsurface (up to 12 months).
2. Clean, low-cost, non-disruptive application (direct-push, excavations or socks).
3. Direct injections are usually not limited by presence of surface structures .
4. Eliminates the cost of operation and maintenance associated with mechanical systems
5. Can be faster and have lower costs than drawn out natural attenuation approaches.
ORC, as with other bioremediation products, is generally more expensive than in situ chemical oxidation (ISCO) when comparing unit costs.
The process of remediation using ORC takes longer than other methods. ORC can take months to years to remediate the soil depending on the contamination, while ISCO is a much faster process. Often, projects have tight time constraints, so in those instances, ORC would not be the best choice.
Parameters required to evaluate ORC applicability:
1. Contaminant concentrations/phase
2. Groundwater depth/flow rates
3. pH, alkalinity
4. Contaminant type and mass
5. Geology of contaminated subsurface (sand, bedrock)
6. Natural Organic Demand
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