His area of research interest is waste management for resource recovery, focusing on two major sub-areas: biomass feedstock engineering and bioconversion processes and systems. Research work on biomass feedstock engineering includes the characterization, preprocessing, storage, and quality improvement and management of lignocellulosic waste biomass (forest-origin residues, agricultural crop residues) as the main components of the biomass supply chain logistics, which bridges the gap between biomass harvesting and biofuel production in different types of conversion facilities. The research on solid biofuel involves both the densified form (pellets) and non-densified form (chips and residues). Studies on bioconversion processes and systems are primarily aerobic composting and anaerobic fermentation of non-woody waste biomass (manure, food waste, biosolids).