Water Challenges for Geologic Carbon Capture and Sequestration |
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Authors: | Robin L Newmark Samuel J Friedmann Susan A Carroll |
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Institution: | (1) National Renewable Energy Laboratory, MS 1713, 1617 Cole Boulevard, Golden, CO 80401, USA;(2) Lawrence Livermore National Laboratory, P.O. Box 808, 7000 East Avenue, Livermore, CA 94551, USA |
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Abstract: | Carbon capture and sequestration (CCS) has been proposed as a means to dramatically reduce greenhouse gas emissions with the
continued use of fossil fuels. For geologic sequestration, the carbon dioxide is captured from large point sources (e.g.,
power plants or other industrial sources), transported to the injection site and injected into deep geological formations
for storage. This will produce new water challenges, such as the amount of water used in energy resource development and utilization
and the “capture penalty” for water use. At depth, brine displacement within formations, storage reservoir pressure increases
resulting from injection, and leakage are potential concerns. Potential impacts range from increasing water demand for capture
to contamination of groundwater through leakage or brine displacement. Understanding these potential impacts and the conditions
under which they arise informs the design and implementation of appropriate monitoring and controls, important both for assurance
of environmental safety and for accounting purposes. Potential benefits also exist, such as co-production and treatment of
water to both offset reservoir pressure increase and to provide local water for beneficial use. |
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