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Full-Text Articles in Environmental Engineering
A Cultural And Technical Study Of Wastewater Treatment Plant Maintenance In A Small Community In Peru, Rebecca C. Midkiff
A Cultural And Technical Study Of Wastewater Treatment Plant Maintenance In A Small Community In Peru, Rebecca C. Midkiff
Dissertations, Master's Theses and Master's Reports
Management of wastewater treatment plants (WWTPs) has been found to be especially challenging in small, rural communities of the developing world. This study examined maintenance of two small WWTPs in Leymebamba and Palmira, Peru through interviews with local authorities, observation of maintenance practices, wastewater measurements, and prediction of effects from maintenance with modeling using a wastewater process simulation software, BioWin. Challenges and motivations related to maintenance were investigated with semi-structured interviews, and maintenance practices were recorded during observations. It was found that outside supervision was a key motivating factor, and the existence of an operator who is supported by the …
Evaluating The Anaerobic Codigestion Potential Of Stillage And Dairy Manure In A Tubular Digester, Brad J. Weiss
Evaluating The Anaerobic Codigestion Potential Of Stillage And Dairy Manure In A Tubular Digester, Brad J. Weiss
Dissertations, Master's Theses and Master's Reports
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 …