Research Papers by Michael J. Semmens

This paper discusses the use of membranes for gas transfer in water and wastewater treatment. Typically, membrane bioreactors use microporous membranes to enhance treatment through improved solids separation. In a number of recent research studies, however, gas-permeable membranes have also been use

Membrane-aerated biofilm reactors (MABRs) support biofilms that receive oxygen and nutrients from opposite sides of the biofilm and thus should behave differently than the activated sludge process. Population modeling predicted the simultaneous presence of aerobic heterotrophs, nitrifying bacteria,