ABSTRACT
This chapter presents a comparison of downflow and upflow coupled biological fluid bed reactor research that has been conducted at the University of North Dakota (UND) using Great Plains Gasification Plant (GPGP) wastewater. A coupled downflow bench scale unit, 1 a coupled upflow bench scale unit 2 and a coupled downflow process development unit 3 have been operated over a three year span. These units have demonstrated that both upflow and downflow coupled biological processes can be highly effective in removing biodegradable organics and nitrogen.
