The effect of corn syrup and whey on the conversion process of CO to ethanol using Clostridium ljungdahlii
Makaleler > Tam Makale · 2020
Yazarlar: Nuri AZBAR
Chemosphere, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2020, cilt 261, ss 127734-127734
DOI: 10.1016/j.chemosphere.2020.127734
Özet
<p>CO is one of the toxic components of syngas, which is the major source of air pollution. Syngas</p><p>fermentation technology has the ability to convert toxic gases into valuable biofuels, such as ethanol.</p><p>Fermentative ethanol production is an important method that can be used to promote environmental</p><p>protection. CO can be converted into ethanol, via the WoodeLjungdahl pathway, using Clostridium</p><p>ljungdahlii. The components of the growing mediumeeespecially the trace-element solution and yeast</p><p>extracteeare the main reasons for the high costs associated with this process, however, and this</p><p>especially impacts scaled-up operations. In this study, cheaper substitutes for these components were</p><p>used in order to determine their effect on ethanol production. The study comprised three main parts</p><p>eethe optimization of CO concentration, and the substitution of corn syrup and whey powder in the</p><p>process. The optimum volume of CO for ethanol production was found to be 10 mL. Corn syrup can be</p><p>used instead of trace-element solution, but the use of yeast extract with the corn syrup was determined</p><p>to be essential. Up to 1.4 g/L ethanol production was observed with the addition of 15 mL corn syrup.</p><p>Whey powder had the advantage of being usable without yeast extract, with up to 2.5 g/L ethanol being</p><p>produced from a 30-g/L concentration. The main finding was that either corn syrup or whey powder can</p><p>be used as substitutes for expensive basal-medium components.</p>