Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal

Data-driven surrogate modelling and multi-variable optimization of trickle bed and packed bubble column reactors for CO2 capture via enhanced weathering

“…Calcite was used as mineral packing to perform the EW reaction of CO 2 in a fresh water aqueous environment. Five design parameters, i.e., particle diameter, packed bed height, superficial velocities of gas and liquid, as well as inlet CO 2 concentration, were numerically studied after the physics-based models had been experimentally validated [11]. The reactors were operated in counter-current mode, in which gas and water were introduced from the bottom and the top of the reactors, respectively (see Fig.…”

“…Installation of the alkaline minerals in chemical rectors operated at controllable conditions offers a method for exploiting this natural process at higher rates of carbon capture and lower consumptions of energy and water [10]. Moreover, chemical reactors could integrate with DAC devices and convert concentrated CO 2 into bicarbonate stored in the ocean through EW of minerals [11].…”

“…The gas-liquid and liquid-solid interfacial areas are determined by the bubble and particle sizes, respectively. Moreover, the pressure drop of a TB reactor is lower than that of a PBC reactor owing to the incomplete occupation of liquid within the void space of the TB [11,12]. To achieve improved CO 2 absorption performance, alkaline liquid solvents, e.g., amine [13] and monoethanolamine (MEA) [14], are typically used as absorbents.…”

“…However, limited research has been done on the EW of minerals in chemical rectors, i.e., TB and PBC, operated at controllable conditions. To the best knowledge of the authors, the two papers of Xing et al [11,21] published in the last two years are the pioneering works in this field. EW of minerals in chemical reactors could accelerate the mineral dissolution rate and reinforce the mass transfer rate of gaseous CO 2 dissolution into water, which is beneficial towards releasing the potential of EW-based large-scale CO 2 capture on the scale of 100-1000 Gt CO 2 per year [20].…”

GCAM-CDR v1.0: enhancing the representation of carbon dioxide removal technologies and policies in an integrated assessment model

“…There are various other approaches to ocean alkalinization that are not included in GCAM-CDR 1.0. For example, some researchers have proposed dumping silicate minerals into the ocean (Köhler et al, 2013); spreading crushed silicates on beaches or coastal seabeds (Meysman and Montserrat, 2017); exposing carbonate minerals to seawater in an artificial, high-CO 2 environment (Xing et al, 2022); releasing carbonate and bicarbonate produced as a by-product of hydrogen production (Rau et al, 2018); or electrochemically separating seawater and pumping acidity into deep water (Tyka et al, 2022).…”