Optimization of process parameters for bioethanol production from low grade Iraqi dates

Abstract EN

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 semiempirical 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.