Pressurized upflow reactor system for the bioconversion of coal to methane: Investigation of the coal/sand interface effect - Mesle, Margaux; Hodgskiss, Logan; Barnhart, Elliott; Dobeck, Laura; Eldring, Joachim; Hiebert, Randy; Cunningham, Alfred; Gerlach, Robin; Phillips, Adrienne; Fields, Matthew (Cleaner Chemical Engineering, 2023)