This book is a reference source on evaluate of the performance of the anaerobic migrating blanked reactor (AMBR) and anaerobic baffled reactor (ABR) in the treatment of nitroorganic compounds. This book consists of five chapters. Chapter One Introduction : The Objective and Scope of the Study, The Novelties of the Study; Chapter Two - Literature Review: Nitroaromatic Compounds, Anaerobic Baffled Reactor (ABR), Anaerobic Migrating Blanked Reactor (AMBR); Chapter Three - Materials and Methods: Experimental System, Seed of Reactors, Analytical Methods, Operation Conditions, Kinetic Approaches in Anaerobic Continuous Studies; Chapter Four - Results and Discusions: Batch Studies, Continuous Studies, Determination of Kinetic Constants, Process Economy; Chapter Five - Conclusions