This book provides an overview of hydrodynamics and gas-liquid mass transfer operations for various bioreactor configurations. It details a summary of the available information for various bioreactors, reviews the relevant theories and experimental procedures, and provides a procedure for bioreactor selection. The book reviews the problems of bioreactor selection globally while considering all bioreactor options rather than concentrating on one specific bioreactor type. As such, the book has numerous uses ranging from providing introductory material for those new to bioreactor applications to summarizing the various options for improved bioreactor operations and selection for those designing bioreactor applications. Finally the book explains hydrodynamics and gas-liquid mass transfer operations in various bioreactors and how bioreactor design can influence desired outcomes.