Cluster bearing of resident PAH/BTEXs contaminants under double-diffusion of invaded supercritical carbon dioxide in sedimentary geostorage media

Abstract

This work reveals a key goestorage mechanism of supercritical carbon dioxide in a sedimentary soil sample, with a clustering response of resident contaminants such as benzene, naphthalene, and pyrene. These contaminants are deposited on the surface of the solid bundles with a mass film thickness of 5 μm. The injection boundaries of sCO2 are ranged between 300−330 K, and 8−10 MPa, with a mass flow rate of 0.05–0.15 kg/min. A variant of Color Fluid Lattice-Boltzmann model is developed to mimic the breakthrough of sCO2 front in the pore bodies under the effect of generated clusters such as BN-embedded tetraphene. During the spatiotemporal invasion, the interfacial mass diffusion is jumped in Gaussian magnitudes with dominant effects of mass flow rate and injection pressure. The growth of BN-tetraphene revealed the authority of a critical operating time to promote the action of the residual chemical potential on the solvation power of sCO2. However, this cluster is affected by a secondary degradation following the increased concentration of sCO2 in the pore throats of the microporous. Remarkable diffusion is achieved in the case of sCO2/naphthalene, with a large amount of collected naphthalene and relatively low clogged pores, due to the supercritical solvation power of CO2 inside the microporous. These results support the theory of carbon capture and storage in reactive porous reservoirs.