Fig. 4

General reactive transport model results for straight-pipe (a) and expanding-plume (b) models. Lateral cross-sections depicting each model are shown on the left. The estimated concentration of M. jannaschii and M. thermolithotrophicus cells and the geometry of the flow path are shown on the right. The fluid temperatures at steps 0 and 1 are 84.6 and 26.7 °C, respectively