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View Diary: Sea Urchin offers path to Cheap Carbon Sequestration (118 comments)

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  •  Excellent point; the ocean is one source, since (18+ / 0-)

    (unfortunately!) the rise in oceanic acidity means more Ca goes onto solution. How that's supposed to help Midwest power plants is an open question.

    However, there's also a lot of Ca in concrete rubble from demolition, and probably in drywall, too, from the gypsum. There's a LOT of drywall presently just going into landfill. Recycling it would be great!

    •  In the long term to make it sustainable (18+ / 0-)

      you'd need to "close the loop" somehow. That's how sustainable systems work. They form closed loops. Waste from one process becomes food for another, and eventually the matter cycles all the way back again.

      That's why biomass is potentially sustainable.  The carbon is captured from the atmosphere in plant form, transformed into fuel, re-emitted into the atmosphere. The atoms go round and round, and the only net input is solar energy and the only net output is entropy. Contrast this to fossil fuels in which the carbon is extracted from the ground and ultimately dumped into the atmosphere.  

      Of course, this particular idea is meant to address the problems created by another non-sustainable technology: fossil fuels.  If the supply of calcium exceeds what is needed to sequester a significant fraction of all the carbon that will ever be emitted from fossil fuels,  until the day fossil fuels simply become uneconomical to use in any quantity, then this particular sequestration process might be practical.

      If the supply of calcium is insufficient to make a dent in the total future carbon emissions from fossil fuels, then this process is only useful if it is part of a larger, sustainable (i.e. closed loop) system.  For example, if the calcium carbonate was used to carry the carbon to a place where it could be extracted and sequestered separately, and the calcium could be recovered and reused.

      I've lost my faith in nihilism

      by grumpynerd on Tue Feb 05, 2013 at 06:07:01 PM PST

      [ Parent ]

    •  gypsum? (0+ / 0-)

      i guess you'd have to add energy (thus more CO2) to split up the gypsum and extract calcium.

      which would of course leave stuff like sulfur dioxide as a byproduct.

      anyone born after the McDLT has no business stomping around acting punk rock

      by chopper on Wed Feb 06, 2013 at 10:16:04 AM PST

      [ Parent ]

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