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8755174 
Meetings & Symposia 
Accelerated bioremediation with oxygen release compound-advanced (ORC-Advanced™): Evolution of time-release electron acceptors 
Koenigsberg, SS; Willett, A; Farone, W 
2005 
2005 
235-237 
English 
Oxygen is typically the limiting substrate for microbes capable of aerobically biodegrading contaminants, e.g., petroleum hydrocarbons and gasoline oxygenates. Oxygen Release Compound-Advanced (ORC-Advanced™) is a state-of-the-art solid oxygen source for stimulating in situ aerobic bioremediation. When hydrated, ORC-A is designed to release its full amount of oxygen (17 wt %) consistently over a 12 mo period. This process enables aerobic microbes to significantly accelerate rates of bioremediation over longer periods of time. ORC-A was engineered with Controlled Release Technology (CRT™), which retards the hydration of the calcium oxyhydroxide crystal and slows the formation oxygen in and its release from the crystal structure. The CRT chemistry prevents premature and rapid release of oxygen that can lead to uncontrolled bubbling and oxygen waste via "blow off" prior to injection into a contaminated aquifer. CRT involves the intercalation (permeation) of phosphate into the crystalline structure of calcium oxyhydroxide. ORC-A was tested in the laboratory for oxygen release characteristics and was injected for aerobic bioremediation at several field sites. The advanced chemistry of ORC-A is presented as well as laboratory and field results. This is an abstract of a paper presented at the 2005 Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Assessment, and Remediation Conference (Costa Mesa, CA 8/18-19/2005).