Conversion of Selected Addis Ababa Municipal Solid Waste to Ethanol (Case study of Yeka sub city)

No Thumbnail Available



Journal Title

Journal ISSN

Volume Title


Addis Ababauniversity


Selected municipal solid wastes (mango and banana peels and remains) were collected, proportioned, dried, and crushed to be used as samples of this research. Principally, three experiments were carried out in series for each of the samples (one after the other), namely: hydrolysis, fermentation and distillation. The effects of factors in hydrolysis step were investigated and the global optimum combination of factor values (temperature, time and acid concentration) was set by experimentation. Factorial design of threefactors- at-two-level (23 = 8) was applied to the hydrolysis step to purely investigate the effects of hydrolysis parameters on the response variable (ethanol yield). In the analysis section, the principles of factorial design were applied to calculate the main effects, interaction effects and response tendencies. Main effects were found to be -0.125, 0.375 and 0.875 for acid concentration, time and temperature respectively. This implied that, increasing temperature level could result in relatively the highest ethanol yield than the remaining factors. Interaction effects between factors were also calculated. Accordingly, TxC and txC are -10.75 and -5.75 respectively. From this theoretical ground, the factor combination was set at 1%v/v, 60minutes and 150oC and the samples were tested at this determined point and, above and below it (three extra experiments). The highest ethanol yield was 25.5mL/50g (solution) or 24.48mL/50g pure ethanol and 26mL/50g (solution) and 24.44mL/50g pure ethanol for the first 8 and the last 3 experiments respectively. The global optimum factor combination was set at 100oC, 1%v and 60minutes for hydrolysis temperature, acid concentration and hydrolysis time respectively after analysis. It was also estimated that conversion of banana and mango peels and remains to ethanol could eliminate 16.2% of the municipal solid waste in the sub city



Municipal Solid Waste to Ethanol