Environmental Relevance of the Leachate Potential for Dry Storage of Delayed Coke

CIM Montreal 2011
Joseph Fournier,
Abstract Suncor Oil Sands uses delayed coking technology to convert bitumen into synthetic crude oil. Currently up to 10,000 m3 of delayed petroleum coke (coke) is produced per day as a byproduct of the upgrading process, which up to 9,000 m3 per day is placed in dry storage on Lease 86/17. The long term environmental implications of this storage are currently not yet fully understood. A review was completed to examine the case history of leachate potential experiments from the dry storage of delayed coke and the environmental relevance of coke leachate studies conducted over the past decade. The review included an evaluation of environmental conditions within the location of coke storage. This study examined precipitation pH, daily and annual ozone trends and potential acid input (PAI) deposition rates within the Athabasca Valley. The Athabasca Valley precipitation pH values were generally more alkaline and had lower ozone concentrations relative to background levels quantified in Fort Chipewyan. Coke leachate potential has primarily been characterized using strong acids and oxidizing agents. Since conditions in the Athabasca Valley tend to be alkaline with lower ozone than Fort Chipewyan these testing regimes lack environmental relevance relative to the conditions under which coke is stored
Keywords: Delayed coke, leachate, petroleum coke
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