scholarly journals Desalination Technique on Seaweeds Hydrolysate Eucheuma Cottonii for Bioethanol Production

2021 ◽  
Vol 1 (4) ◽  
pp. 114-120
Author(s):  
Jaini Fakhrudin ◽  
Dwi Setyaningsih ◽  
Mulyorini Rahayuningsih
Keyword(s):  
Osmotic Pressure ◽  
Significant Influence ◽  
Fermentation Process ◽  
Ethanol Yield ◽  
Salinity Level ◽  
Bioethanol Production ◽  
Eucheuma Cottonii ◽  
Dissolved Salts

The dissolved salts on Eucheuma cottonii hydrolysate interfere the growth of S. cerevisiae in the fermentation as it is considered as inhibitors. These salts are derived from biomass and formed from the chemicals used for hydrolysis processes such as H2SO4 and CaOH2. Ions and cations of the salts are potential as inhibitors such as Na+, Cl-, NH4+, SO42-. Osmotic pressure is raised due to the presence of salt. The efforts had been made to reduce salinity level through electrodialysis. The objective of this study was to eliminate dissolved salts in the hydrolysate in order to optimize the process of fermentation and increase ethanol yield. The results showed that the process of desalination by electrodialysis was able to reduce the salinity of 20% on the voltage of 5 V for 30 minutes; the voltage 9 V for 15 minutes; the voltage 12 V for 30 minutes. The lowest decline of SO42- occurred at treatment of 12 V for 45 minutes. The content of sulfate in the treatment decreased to 2.97 g/l or 46.22%. The more sulfate is reduced through the electrodialysis process, the better the fermentation process is carried out. Desalination treatment at a voltage of 5 V for 30 minutes had been the best treatment because it    produced the highest ethanol yield of 2.06%. All the voltage treatments and the length of time on the electrodialysis process had a significant influence on the levels of ethanol yield. The process of desalination by electrodialysis was able to reduce the levels of dissolved salts, then it had a significant effect on ethanol yield.

scholarly journals Evaluation of polyploid miscanthus lines usage efficiency as a feedstock for bioethanol production

2021 ◽  
Vol 29 ◽  
pp. 13-19
Author(s):  
R. Y. Blume ◽  
O.V. Melnychuk ◽  
S.P. Ozheredov ◽  
D.B. Rakhmetov ◽  
Y.B. Blume
Keyword(s):  
Sweet Sorghum ◽  
Second Generation ◽  
Ethanol Yield ◽  
Bioenergy Crops ◽  
Control Line ◽  
Bioethanol Production ◽  
Second Generation Bioethanol ◽  
Giant Miscanthus ◽  
First And Second Generation ◽  
Bioethanol Yield

Aim. Main aim of this research was the evaluation of theoretical bioethanol yield (per ha) from hexaploid giant miscanthus (Miscanthus х giganteus) and further comparison with conventional triploid form as well as with other bioethanol crops. Methods. Several mathematic functions were determined that describe yearly yield dynamics and equations, which were used in calculations of theoretical bioethanol yield. Results. The theoretical bioethanol yield was evaluated for different hexaploid miscanthus lines. The most productive in terms of ethanol yield were lines 108 and 202, from which potential bioethanol yield was found to be higher than in control line (6451 L/ha) by 10.7 % and 14.2% respectively and can reach 7144 L/ha and 7684 L/ha. Conclusions. It was determined that the most productive lines of polyploid miscanthus (lines 108 and 202) are able to compete with other plant cellulosic feedstocks for second-generation bioethanol production in Ukraine. However, these lines show bioethanol productivity than sweet sorghum, in the case when sweet sorghum is processed for obtainment of both first- and second-generation bioethanol. Keywords: bioenergy crops, biofuels, giant miscanthus, Miscanthus, polyploidy, second-generation bioethanol.

scholarly journals Fermentation Study on Macroalgae Eucheuma cottonii for Bioethanol Production via Varying Acid Hydrolysis

2012 ◽  
pp. 219-240 ◽  
Author(s):  
Rachel Fran Mansa ◽  
Wei-Fang Chen ◽  
Siau-Jen Yeo ◽  
Yan-Yan Farm ◽  
Hafeza Abu Bakar ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Bioethanol Production ◽  
Eucheuma Cottonii

scholarly journals A microbubble-sparged yeast propagation–fermentation process for bioethanol production

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Vijayendran Raghavendran ◽  
Joseph P. Webb ◽  
Michaël L. Cartron ◽  
Vicki Springthorpe ◽  
Tony R. Larson ◽  
...  
Keyword(s):  
Fermentation Process ◽  
Bioethanol Production

scholarly journals Evaluation of Copper-Contaminated Marginal Land for the Cultivation of Vetiver Grass (Chrysopogon zizanioides) as a Lignocellulosic Feedstock and its Impact on Downstream Bioethanol Production

2019 ◽  
Vol 9 (13) ◽  
pp. 2685 ◽  
Author(s):  
Emily M. Geiger ◽  
Dibyendu Sarkar ◽  
Rupali Datta
Keyword(s):  
Contaminated Soil ◽  
Ethanol Yield ◽  
Dilute Acid Pretreatment ◽  
Cellulose Content ◽  
Bioethanol Production ◽  
Vetiver Grass ◽  
Acid Pretreatment ◽  
Biofuel Feedstock ◽  
Lignocellulosic Feedstock ◽  
The Impact

Metal-contaminated soil could be sustainably used for biofuel feedstock production if the harvested biomass is amenable to bioethanol production. A 60-day greenhouse experiment was performed to evaluate (1) the potential of vetiver grass to phytostabilize soil contaminated with copper (Cu), and (2) the impact of Cu exposure on its lignocellulosic composition and downstream bioethanol production. Dilute acid pretreatment, enzymatic hydrolysis, and fermentation parameters were optimized sequentially for vetiver grass using response surface methodology (RSM). Results indicate that the lignocellulosic composition of vetiver grown on Cu-rich soil was favorably altered with a significant decrease in lignin and increase in hemicellulose and cellulose content. Hydrolysates produced from Cu exposed biomass achieved a significantly greater ethanol yield and volumetric productivity compared to those of the control biomass. Upon pretreatment, the hemicellulosic hydrolysate showed an increase in total sugars per liter by 204.7% of the predicted yield. After fermentation, 110% of the predicted ethanol yield was obtained for the vetiver grown on Cu-contaminated soil. By contrast, for vetiver grown on uncontaminated soil a 62.3% of theoretical ethanol yield was achieved, indicating that vetiver has the potential to serve the dual purpose of phytoremediation and biofuel feedstock generation on contaminated sites.

scholarly journals Influence of Lactose Concentration in Bioethanol Production from Cheese Whey

2017 ◽  
Vol 39 (5) ◽  
pp. 533
Author(s):  
Cleidiane Samara Murari ◽  
Débora Cristina Moraes Niz da Silva ◽  
Bruna Lima da Silva ◽  
Vanildo Luiz Del Bianchi
Keyword(s):  
Alcoholic Fermentation ◽  
Cheese Whey ◽  
Ethanol Yield ◽  
Oxygen Demand ◽  
Bioethanol Production ◽  
Organic Substances ◽  
Promising Alternative ◽  
Renewable Source ◽  
Initial Concentration ◽  
Lactose Concentration

The present study aimed the utilization of the cheese whey as substrate for ethanol production by Kluyveromyces marxianus.  Was studied the effect of the initial concentration of cheese whey (M1 57,6 g L-1; M2 45,6 g L-1; M3 32,5 g L-1 e M4 18,8 g L-1) on the alcoholic fermentation. After sterilization, the medium were incubated at 30ºC for 48 hours, performing analysis of lactose, proteins, ethanol, cell growth and chemical oxygen demand. According to the results, the medium M1 (the highest concentration) showed a higher production and productivity of ethanol 16.9 g L-1 and 1.26 g L.h-1, respectively, and also obtained the highest production and productivity of cell of 5.8 g L-1 and 0.40 g L.h-1, respectively. However, in terms of ethanol yield, the most satisfactory result was obtained with the M3 medium with 82.30% in 12 hours of fermentation. The organic substances content has been reduced in relation to COD in the medium M4 in 82.28%, representing a promising alternative for valorization of cheese whey as an effective alternative to obtain a renewable source of biofuel.

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