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Farid Talebnia,Moein Mighani,Mostafa Rahimnejad,Irini Angelidaki 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
Rapeseed straw was utilized as a cheap rawmaterial for ethanol production. Effects of steam explosionon chemical composition, enzymatic hydrolysis (EH) andsimultaneous saccharification and fermentation (SSF) werestudied. Changes in the pretreatment conditions showedstrong effects on digestibility of the resulting straw. Theoptimum results were obtained at 180°C, 10% solid fraction,1% H2SO4, and 10 min retention time. Under optimalcondition, glucose hydrolysis yields of 93 and 89% wereobtained for 5 and 10% solid fractions, respectively. Thecorresponding ethanol yields were 63 and 67% of maximumtheoretical value. Next, data of the experimental runs wereexploited for modeling the processes by artificial neuralnetworks (ANNs) and performance of the developed modelswas evaluated. The ANN-based models showed a greatpotential for time-course prediction of the studied processes. Efficiency of the joint network for simulating the wholeprocess was also determined and promising results wereobtained.
Mostafa Rahimnejad,Ghasem Darzi Najafpour,Ali Asghar Ghoreyshi,Farid Talebnia,Giuliano C. Premier,Gholamreza Bakeri,김중래,오상은 한국미생물학회 2012 The journal of microbiology Vol.50 No.4
Microbial fuel cells (MFCs) have been shown to be capable of clean energy production through the oxidation of biodegradable organic waste using various bacterial species as biocatalysts. In this study we found Saccharomyces cerevisiae,previously known electrochemcially inactive or less active species, can be acclimated with an electron mediator thionine for electrogenic biofilm formation in MFC, and electricity production is improved with facilitation of electron transfer. Power generation of MFC was also significantly increased by thionine with both aerated and non-aerated cathode. With electrochemically active biofilm enriched with swine wastewater, MFC power increased more significantly by addition of thionine. The optimum mediator concentration was 500 mM of thionine with S. cerevisae in MFC with the maximum voltage and current generation in the microbial fuel cell were 420 mV and 700 mA/m2, respectively. Cyclic voltametry shows that thionine improves oxidizing and reducing capability in both pure culture and acclimated biofilm as compared to non-mediated cell. The results obtained indicated that thionine has great potential to enhance power generation from unmediated yeast or electrochemically active biofilm in MFC.