Date of Award


Document Type

Open Access Master's Report

Degree Name

Master of Science in Environmental Engineering (MS)

Administrative Home Department

Department of Civil and Environmental Engineering

Advisor 1

Jennifer Becker

Committee Member 1

John Gershenson

Committee Member 2

Audrey Mayer


Evaluations of the anaerobic treatment of sugarcane stillage and dairy manure in a low cost tubular digester were performed in small scale batch experiments and using mathematical simulations. A local sensitivity analysis of the model was performed, and key input parameters were adjusted until the predicted COD removal was consistent with data obtained using two full-scale digesters. Simulations were performed to evaluate COD removal and biogas production for nine different mixtures of stillage and manure at four different temperatures ranging from 15˚C to 30˚C. Digestion of stillage alone was not effective, but when codigested with 20% or more manure, COD removals of >80% and substantial biogas production were predicted. COD removal and biogas production increased with temperature. The batch experiments and model simulations suggest that codigestion of stillage and manure in a tubular anaerobic digester may reduce the environmental impacts of stillage disposal while producing valuable biogas and organic fertilizer.

BJW Report.pdf (1636 kB)