Abstract: A periodic multistage process which minimizes fugitive pollutant emissions has been developed for the removal and destruction of volatile, semi-volatile, and non-volatile organic contaminants from either water, wastewater, or spent granular activated carbon. This invention relates to methods, materials, and systems for treating these contaminants by a process and devices which uniquely combine granular activated carbon adsorption and desorption with biological treatment. The process and devices extend existing treatment systems by: (1) providing biofilm growth in a Sequencing Batch Biofilm Reactor on gas permeable membrane which uses oxygen for the supply of the electron acceptor and other organics (e.g.