Experimental studies of basalt-H2O-CO2 interaction with a high pressure column flow reactor: the mobility of metals
MetadataShow full item record
Here, we report on the mobility of metals at the early stage of CO2 injection into basalt, before significant precipitation of secondary minerals. Short-lived pulses (50-100 hours) of CO2-charged water were injected into a high pressure column flow reactor filled with basaltic glass grains at 22°C, 8 MPa of total pressure and a velocity of 0.4 cm/min. The residence time of the water within the column ranged from 8 to 10 hours. The column was conditioned with pure water, resulting in alkaline outflow (pH ~9). The pH of the inlet CO2-charged water was ~3.2, and the lowest pH measured in the column was 4.5, after less than 10 hours of water/rock interaction. The dissolved metal concentrations and metals relative mobility increased dramatically during the CO2-pulses; more than 100 times for Sr, Fe, Al, Ca, Ba, Mn, and Mg. Of these elements, all but Al can bind with CO2 to form carbonate minerals. Only the dissolved Al, Fe, Mn and Cr concentrations exceeded allowable drinking water limits. After the CO2-pulses, all of the elemental concentrations decreased close-to or even below what was measured during the conditioning of the column. The pH never reached ~9 which was the initial pH before CO2-pulses.
Showing items related by title, author, creator and subject.
Experimental studies of basalt-H2O-CO2 interaction with a high pressure column flow reactor: the mobility of metalsGaleczka, I.; Wolff-Boenisch, Domenik; Gislason, S. (2013)Here, we report on the mobility of metals at the early stage of CO2 injection into basalt, before significant precipitation of secondary minerals. Short-lived pulses (50-100 hours) of CO2-charged water were injected into ...
An experimental study of basaltic glass-H2O-CO2 interaction at 22 and 50°C: Implications for subsurface storage of CO2Galeczka, I.; Wolff-Boenisch, Domenik; Oelkers, E.; Gislason, S. (2014)A novel high pressure column flow reactor was used to investigate the evolution of solute chemistry along a 2.3 m flow path during pure water- and CO2-charged water–basaltic glass interaction experiments at 22 and 50 °C ...
Size exclusion chromatography as a tool for natural organic matter characterisation in drinking water treatmentAllpike, Bradley (2008)Natural organic matter (NOM), ubiquitous in natural water sources, is generated by biogeochemical processes in both the water body and in the surrounding watershed, as well as from the contribution of organic compounds ...