Optimization of Process Parameters for Bioethanol Production from Low grade Iraqi Dates

  • Hussain Majeed Flayeh Hussain Majeed Flayeh, Environmental Eng. Dep. University of Baghdad

Abstract

Box-Wilson experimental design method was employed to optimize bioethanol production from low grade, unclassified, waste Iraqi dates. The optimization process was based on four independent relevant parameters-initial sugar concentration (50-100 g/l), pH (4.5-6.5), fermentation time (48-96 hrs), and temperature (25-35℃). A maximum bioethanol yield of 33.9 g/l was practically achieved following thirty different experimental runs, as specified by 24-Central Composite Design (CCD). The optimum values for the aforementioned four parameters, corresponding to the maximum yield, were: 75g/l, pH 5.5, 72 hrs, 30℃, respectively. The obtained experimental data were utilized to develop a semi-empirical model, based on a second-degree polynomial, to predict bioethanol yield. The model was tested using ANOVA software (Design expert® 9) and found acceptable (R2=0.9025). Yield response surface and contour plots were created using the developed model, which revealed the presence of high-yield plateaus whose specifications will be useful in controlling pilot-or industrial scale future units to ensure economical feasibility.

Published
Jun 12, 2017
How to Cite
FLAYEH, Hussain Majeed. Optimization of Process Parameters for Bioethanol Production from Low grade Iraqi Dates. Al-Nahrain Journal for Engineering Sciences, [S.l.], v. 20, n. 3, p. 647-656, june 2017. Available at: <http://www.nahje.com/index.php/main/article/view/257>. Date accessed: 23 june 2017.