Back to Home
People > Rebecca Hoffmann


Environmental Engineering Masters Student

Completeded in May 2005.

Research: Effect of Mixing Intensity on Anaerobic Digestion of Cow Manure.

More than one billion tons of animal waste is generated each year from dairy farms, hog farms etc. Disposal of such large amounts of waste can lead to problems such as surface and groundwater contamination, odors, and methane emissions. Anaerobic digestion is a possible treatment option for animal waste, which results in energy in the form of methane as the primary product. The effect of mixing in anaerobic digesters is not well understood. The study determined the effect of mixing intensity on digester performance, biomas particle size, and the microbial ecology.

Rebecca was co-advised by Dr. Muthanna Al-Dahhan.

Rebecca Hoffmann



Laboratory digester setup.