[Folda] Fwd: [Jhi] Friday seminar 07.10. 12:30 - Sigurður Reynir Gislason "The state of the Earth´s Carbon cycle. What can we do about it?"

[Deirdre Clark]

Today's Friday seminar at 12:30 is by Sigurður Reynir Gislason on "The
state of the Earth´s Carbon cycle. What can we do about it?"

See abstract below.


---------- Forwarded message ----------
From: Maren Kahl <marenk at hi.is>
Date: Mon, Oct 3, 2016 at 12:02 PM
Subject: [Jhi] Friday seminar 07.10. 12:30 - Sigurður Reynir Gislason "The
state of the Earth´s Carbon cycle. What can we do about it?"
To: jhi at hi.is


Dear all,



our weekly seminar series continues this Friday (07.10.) at 12:30 in the
seminar room on the 3rd floor with a presentation given by:



*Sigurður Reynir Gislason*



“*The state of the Earth´s Carbon cycle.  What can we do about it?”*

The total remaining CO2 atmospheric emission quota to keep global average
temperature increase within 2°C will be used in about 20 years at current
emission rates. To reach the 2°C goal, a portfolio of low-carbon
technologies needs to be employed over the next decades.  This includes
increase in the use of renewable and nuclear energy, fuel switching, energy
efficiency, and about 80 Giga-tonnes of CO2 captured from the power and
industry sectors and stored in rocks before the year 2050. Only about 20
MtCO2 was captured injected in the year 2014.

Much of the security risk associated with geologic carbon storage stems
from its buoyancy, which can be eradicated by dissolving CO2 into water
prior to or during its injection, thus allowing injection into fractured
rocks [1]. We have demonstrated the dissolution of CO2 into water during
its injection in less than 5 minutes and mineral storage within basalt in
two years at 20–50°C at the CarbFix field injection site in SW Iceland [2,
3].

This method requires substantial water, therefore the cost of storing and
transporting a tonne of CO2 via the CarbFix method is about twice that of
geologic storage via “supercritical” CO2 injection. However, the cost of
carbon capture and storage is still dominated worldwide by capture and gas
separation [1]. This cost could be lowered by capturing and injecting gas
mixtures into rocks as is now being tested at the CarbFix–Sulfix site in
SW–Iceland at the Hellisheidi geothermal power plant. Since June 2014 we
have injected 8000 tonnes per year of a 60% CO2 and 40% H2S gas mixture,
which is dissolved in condensation water from the turbines at 20°C and
co–injected with waste water (60–120°C) into the basaltic rock at 700m
depth where the temperature is 250°C.  After more than two years of near
continuous operation, the transmissivity of the injection well is still
stable and monitoring data suggests significant mineralisation of the
injected gas mixture during this period of injection.

[1] Gislason & Oelkers (2014), Science 344, 373–374.

[2] Sigfússon et al. (2015), International Journal of Greenhouse Gas
Control 37, 213–219

[3] Matter et al. (2016). Science 352, 1312-1314.



Looking forward seeing you on Friday.



Best,

Maren & Maria






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-- 
Deirdre Clark, PhD Research Fellow
University of Iceland | Háskóli Íslands
Institute of Earth Sciences
Sturlugata 7, Askja, Room 265
101 Reykjavík, Iceland

+354 525 5414 (Office)
+354 690 5745 (Mobile)
dec2 at hi.is
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