Valorization of Coffee Husk to Bioethanol Using SHF Method
| dc.contributor.advisor | Belay, Woldeyes (Prof.) | |
| dc.contributor.author | Gebreegziabher, Tadesse | |
| dc.date.accessioned | 2018-12-22T06:57:51Z | |
| dc.date.accessioned | 2023-11-10T14:54:29Z | |
| dc.date.available | 2018-12-22T06:57:51Z | |
| dc.date.available | 2023-11-10T14:54:29Z | |
| dc.date.issued | 2018-07 | |
| dc.description.abstract | Coffee husk considers as one of the agricultural waste lignocellulosic biomass that contain high amount of cellulose. Furthermore, the aim of this work was, valorization of coffee husks to bioethanol by using separate hydrolysis and fermentation methods which is critically used as replacements for renewable sources of energy and to minimize environmental pollutions too. This method was accomplished by four major experimental procedures, which were pretreatment, hydrolysis, fermentation and distillation processes. There were three parameters and 20 lab experiments exposed in the laboratory work depending on the H 2 ii SO 4 concentration, hydrolysis temperature and time in the hydrolysis step. The effect of these parameters was analyzed using design expert soft war by CCD design. The results were show that the content of sugars increased as the acid (H 2 SO 4 ) concentration increased from 1% - 3 % and decreased as the acid concentrations increased from 3 % up to 5%. At the optimal acid concentration (3%; H 2 SO 4 ), hydrolysis temperature (130 ℃) and hydrolysis time (70min), the sugar yield gotten was 46.75% from the coffee husk. This sample was further investigated to produce bioethanol and the ethanol yield from this experiment was 51.03%. Based on central composite design ANOVA was carried out to determine the numerical significance of the quadratic response surface model, in which the p-value of the model was less than 0.0001, which shows the model was statistically significant. Consequently, based on this result, the designated model was adequate to fit the data of response variable. Characterization of the bio-ethanol produced was accomplished by FTIR analyzer. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/15276 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | AAU | en_US |
| dc.subject | SHF Method | en_US |
| dc.subject | Coffee Husk | en_US |
| dc.subject | Bioethanol | en_US |
| dc.title | Valorization of Coffee Husk to Bioethanol Using SHF Method | en_US |
| dc.type | Thesis | en_US |