Direct bioconversion of domestic wastewater sludge as a new substrate for bioethanol production through optimization of media

Alam, Md. Zahangir and Kabbashi, Nassereldeen Ahmed and Razak, A A (2006) Direct bioconversion of domestic wastewater sludge as a new substrate for bioethanol production through optimization of media. In: IWA Sustainable Sludge Management Conference 2006, 31 May- 2 June 2006, Moscow, Russia.

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Abstract

A lab-scale study was conducted to produce bioethanol using wastewater sludge as substrate by the yeast Saccharomyces cerevisiae. Direct bioconversion process was applied through media optimization for bioethanol production. The statistical optimization was carried out with four different media compositions such as the concentration of sludge, co-substrate of wheat flour, ammonium nitrate (NH4NO3) and potassium dihydrogen phosphate (KH2PO4) with five levels by central composite design. A polynomial regression model equation was developed by using experimental values obtained from experimental design. The model predicted the optimum media compositions which were 1.5% (v/v) of sludge, 3% (v/v) of co-substrate, 500 mg/L of NH4NO3 and 400 mg/L of KH2PO4. The bioethanol yield was obtained with 4.6% under these conditions. The coefficient of determination (R2) for the model is 96% indicating that the bioethanol production is very highly associated with the independent variables (media compostion).

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	4157/5845
Uncontrolled Keywords:	Bioethanol; direct bioconversion; domestic wastewater sludge; optimization
Subjects:	T Technology > TP Chemical technology T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Dr. Md. Zahangir Alam
Date Deposited:	17 Nov 2011 12:17
Last Modified:	22 Nov 2011 06:47
URI:	http://irep.iium.edu.my/id/eprint/5845

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