Phil
I've been through this paper in some detail. My previous
understanding leads me to believe that by far the most efficient
method is to take olivine-rich mine overburden and rely on
wave-comminution on beaches. This is AFAIK Schulling's preferred
method, and I can't see anything wrong with it. I also can't see this
specifically discussed in your analysis - and a quick skim (eg F14 -
separate process) suggests you're chiefly considering industrial
grinding. You do briefly mention issues related to particle size, re
wave comminution, but you don't AFAIK consider surface flaking or the
effect of digestive transit - two methods which have previously been
suggested as of paramount importance. Nevertheless, EW methods come
towards the bottom of your costs range, suggesting that it's well
worth further detailed study. If I understand it correctly, your
"accelerated weathering of limestone" cost estimate requires flue gas
- something we can't rely on, in a post-fossils world. Accordingly,
this suggests that EW is in fact the lowest-cost method. Further, I
couldn't see anything to suggest EW is scale-limited, in the paper.
Perhaps you'd care to comment on which of the above
costs/mechanisms/effects has been considered - by your work, or that
of others you're aware of?
Thanks
A
On 27 July 2017 at 14:32, renforthp wrote:
> Dear list,
>
> You may be interested in the paper 'Assessing ocean alkalinity for carbon
> sequestration' that has just been published in Reviews of Geophysics
>
> http://onlinelibrary.wiley.com/doi/10.1002/2016RG000533/abstract
>
> All the best,
>
> Phil Renforth
>
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