Introducing a new salty waste for second-generation bioethanol production

ABSTRACT

We have introduced the discards of turnip juice as a raw material for bioethanol production for the first time. Pretreatment methods, initial biomass loading, and fermentation time were investigated. Supplementation of different kinds of nitrogen sources, mineral salts and agricultural waste hydrolysates were added in the growth medium. The highest bioethanol concentrations and Q_p values were 7.32, 5.34, 1.55 g/L and 0.61, 0.44, 0.05 g/L.h for S. cerevisiae, K. marxianus and P. stipitis, respectively. Furthermore, Y_p/s values were 0.46 g/g, 0.47 g/g, and 0.37 g/g for the three yeasts. Turnip juice discards are promising raw materials for bioethanol production.

KEYWORDS:

• Bioethanol
• carrot pomace
• fermentation
• molasses
• turnip juice discards

Additional information

Funding

This study was supported by the Ankara University Research Foundation. Project Number: 17L0430007.