The objective of this research was to evaluate the amenability of biological treatment of wastewater from the gasifier (coal gasification) unit operated by the Morgantown Energy Technology Center. The general approach used in this work was to develop a biomass acclimated to the gasifier wastewater and then make a series of runs at various organic loading rates and detention times to develop performance and design parameters. In Series A, a set of preliminary runs was carried out to examine the influence of dilution and detention time on performance. A second set (Series B) of experiments was undertaken to assess a combined biological-physical system with powdered activated carbon added directly to the biological reactors. An amendment was made to the original contract for this purpose. Finally, based on the results of Series A, a more extensive series (Series C) of continuous flow runs was made to develop kinetic data. 40 references, 25 figures, 21 tables.