Evaluation of ethanol fermentation parameters for bioethanol production from sugar beet pulp and juice

Abstract

The aim of this study was to investigate the efficient utilization of sugar beet pulp, as well as raw, concentrated raw and thick sugar beet juice, for bioethanol production. Different fermentation conditions were examined. The influence of raw material pre-treatment (pasteurization or sterilization), type of batch culture process (stationary or shaken) as well as the type of Saccharomyces cerevisiae yeast preparation on the yields of the process were studied. Moreover, the fermentation process effectiveness was examined in connection with the quality of the obtained distillates. Sterilization, stationary batch culture and Safdistil C-70 yeast preparation were identified as the most profitable factors for sugar beet pulp fermentation, providing a high fermentation efficiency and ethanol yield (87.7% of theoretical ethanol yield). Concentrated raw beet juice resulted in a value of 94.2% of theoretical yield, and thick juice a 92.6% yield. The results suggest that bioethanol production from sugar beet pulp and sugar beet juice has promise as an alternative fuel. The raw spirits obtained from the sugar beet juice were characterized as having the lowest quantity of volatile by-products.

Bioethanol production from sugar beet molasses and thick juice by free and immobilisedSaccharomyces cerevisiae

“…The chemical composition of the substrates makes thick juice a much more attractive feedstock for bioethanol production. Additionally, another advantage of thick juice is its higher microbiological stability, resulting from the high sugar concentration, which supports longer storage .…”

“…Hence, gaining insight into the yield of ethanol that can be produced from raw materials under certain production conditions is of importance. Therefore, the yield of ethanol is often presented as ethanol produced per mass unit of raw material . The natural potential of molasses and thick juice as raw materials for ethanol production, ethanol yield ( Y ), is presented in Table .…”

“…Combined production of sugar and ethanol enables increased profitability and fuel efficiency in sugar beet processing by using intermediate or by‐products for ethanol production . As raw materials, Sugar beet juice is more efficient and easier to process than sugar beet pulp, also resulting in the production of raw spirits with lower quantities of volatile by‐products .…”

Comparison of quantitative NMR and IRMS for the authentication of ‘Polish Vodka’

“…There is also the possibility of the addition of other cheaper raw materials like sugar beet root, which is cultivated especially in Eastern Europe. As part of this work we do not study ethanol from sugar beet, due to the fact that only 3% of Poland's cultivation area was utilized by the sugar beet crop and, according to the data of the Central Statistical Office in Poland, this raw material was used only for sugar production , …”

“…As part of this work we do not study ethanol from sugar beet, due to the fact that only 3% of Poland's cultivation area was utilized by the sugar beet crop and, according to the data of the Central Statistical Office in Poland, this raw material was used only for sugar production. 2,21 The distinction between ethanol samples obtained from C 3 and C 4 plants based on different deuterium distributions was performed. In our study we demonstrate that a spectrometer not equipped with a specific 'deuterium' probe (having field frequency stabilization at the fluorine channel) can be efficiently employed for the determination of isotope composition.…”