Temesgen Mathewos Fitamo
Technical University of Denmark
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Publication
Featured researches published by Temesgen Mathewos Fitamo.
Bioresource Technology | 2016
Temesgen Mathewos Fitamo; Alessio Boldrin; Kanokwan Boe; Irini Angelidaki; Charlotte Scheutz
Co-digestions of urban organic waste were conducted to investigate the effect of the mixing ratio between sludge, food waste, grass clippings and green waste at different hydraulic retention times (HRTs). Compared to the digestion of 100% sludge, the methane yield increased by 48% and 35%, when co-digesting sludge with food waste, grass clippings and garden waste with a corresponding %VS of 10:67.5:15.75:6.75 (R1) and 10:45:31.5:13.5 (R2), respectively. The methane yield remained constant at around 425 and 385 NmL CH4/g VS in R1 and R2, respectively, when the reactors were operated at HRTs of 15, 20 and 30 days. However, the methane yield dropped significantly to 356 (R1) and 315 (R2) NmL CH4/g VS when reducing the HRT to 10 days, indicating that the process was stressed. Since the methane production rate improved significantly with decreasing HRT, the trade-off between yield and productivity was obtained at 15 days HRT.
Water Research | 2016
Temesgen Mathewos Fitamo; Alessio Boldrin; G. Dorini; Kanokwan Boe; Irini Angelidaki; Charlotte Scheutz
Mathematical anaerobic bioconversion models are often used as a convenient way to simulate the conversion of organic materials to biogas. The aim of the study was to apply a mathematical model for simulating the anaerobic co-digestion of various types of urban organic waste, in order to develop strategies for controlling and optimising the co-digestion process. The model parameters were maintained in the same way as the original dynamic bioconversion model, albeit with minor adjustments, to simulate the co-digestion of food and garden waste with mixed sludge from a wastewater treatment plant in a continuously stirred tank reactor. The models outputs were validated with experimental results obtained in thermophilic conditions, with mixed sludge as a single substrate and urban organic waste as a co-substrate at hydraulic retention times of 30, 20, 15 and 10 days. The predicted performance parameter (methane productivity and yield) and operational parameter (concentration of ammonia and volatile fatty acid) values were reasonable and displayed good correlation and accuracy. The model was later applied to identify optimal scenarios for an urban organic waste co-digestion process. The simulation scenario analysis demonstrated that increasing the amount of mixed sludge in the co-substrate had a marginal effect on the reactor performance. In contrast, increasing the amount of food waste and garden waste resulted in improved performance.
Water Research | 2017
Temesgen Mathewos Fitamo; Laura Treu; Alessio Boldrin; Cristina Sartori; Irini Angelidaki; Charlotte Scheutz
Energy | 2016
Alessio Boldrin; Khagendra Raj Baral; Temesgen Mathewos Fitamo; Ali Heidarzadeh Vazifehkhoran; Ida Græsted Jensen; Ida Kjærgaard; Kari Anne Lyng; Quan Van Nguyen; Lise Skovsgaard Nielsen; Jin Mi Triolo
Water Research | 2017
Temesgen Mathewos Fitamo; Jin Mi Triolo; Alessio Boldrin; Charlotte Scheutz
Tappi Journal | 2016
Temesgen Mathewos Fitamo; Olli Dahl; Emma R. Master; Torsten Meyer
Archive | 2017
Temesgen Mathewos Fitamo; Charlotte Scheutz; Alessio Boldrin
BioCycle REFOR16 - 16th annual conference | 2016
Temesgen Mathewos Fitamo; Alessio Boldrin; G. Dorini; Kanokwan Boe; Irini Angelidaki; Charlotte Scheutz
Sardinia 2015 - 15th International Waste Management and Landfill Symposium | 2015
Temesgen Mathewos Fitamo; Alessio Boldrin; Irini Angelidaki; Kanokwan Boe; Charlotte Scheutz
DTU Sustain Conference 2015 | 2015
Temesgen Mathewos Fitamo; Alessio Boldrin; Khagendra Raj Baral; Ali Heidarzadeh Vazifehkhoran; Ida Græsted Jensen; Ida Kjærgaard; Kari-Anne Lyng; Quan Van Nguyen; Lise Skovsgaard Nielsen; Jin Mi Triolo