Temperature profiling to maximize energy yield with reduced water input in a lignocellulosic ethanol biorefinery

Dong, Chengyu; Wang, Ying; Chan, Ka Lai; Bhatia, Akanksha; Leu, Shao-Yuan

doi:10.1016/j.apenergy.2018.01.066

Cited by 16 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that cellulases have an optimal temperature around 50 °C [33], whereas the optimal temperature for R. toruloides is 30 °C. To attain more hydrolytic activity of cellulase, SSLP process cultivated cells at a higher temperature, but cellular metabolism might be inhibited for lipid production [34,35]. In It was clear that lipid yields of PreSSLP process at 30 • C were generally higher than those of the SSLP process at 37 • C excepting the experiment with 1.0 mg/g cellulase.…”

Section: Lipid Production Using Presslp Processmentioning

confidence: 99%

“…At a high cellulase loading, enzymatic hydrolysis secured sugar release such that the lipid production process was depending on yeast cell activity. It is known that cellulases have an optimal temperature around 50 • C [33], whereas the optimal temperature for R. toruloides is 30 • C. To attain more hydrolytic activity of cellulase, SSLP process cultivated cells at a higher temperature, but cellular metabolism might be inhibited for lipid production [34,35]. In contrast, PreSSLP process assured optimal temperatures for enzymatic prehydrolysis and cell growth, yet collected residual hydrolytic activity of cellulase in the culture broth.…”

Section: Lipid Production Using Presslp Processmentioning

confidence: 99%

See 1 more Smart Citation

Microbial Lipid Production from Corn Stover by the Oleaginous Yeast Rhodosporidium toruloides Using the PreSSLP Process

Dai

Shen

et al. 2019

Energies

View full text Add to dashboard Cite

Dry acid pretreatment and biodetoxification (DryPB) has been considered as an advanced technology to treat lignocellulosic materials for improved downstream bioconversion. In this study, the lipid production from DryPB corn stover was investigated by the oleaginous yeast Rhodosporidium toruloides using a new process designated prehydrolysis followed by simultaneous saccharification and lipid production (PreSSLP). The results found that prehydrolysis at 50 °C and then lipid production at 30 °C improved lipid yield by more than 17.0% compared with those without a prehydrolysis step. The highest lipid yield of 0.080 g/g DryPB corn stover was achieved at a solid loading of 12.5%. The fatty acid distribution of lipid products was similar to those of conventional vegetable oils that are used for biodiesel production. Our results suggested that the integration of DryPB process and PreSSLP process can be explored as an improved technology for microbial lipid production from lignocellulosic materials.

show abstract

Section: Lipid Production Using Presslp Processmentioning

confidence: 99%

Section: Lipid Production Using Presslp Processmentioning

confidence: 99%

Microbial Lipid Production from Corn Stover by the Oleaginous Yeast Rhodosporidium toruloides Using the PreSSLP Process

Dai

Shen

et al. 2019

Energies

View full text Add to dashboard Cite

show abstract

“…The first try to develop a biorefinery was not very promising, ie, for essential oil production, only 1% to 2% of the raw material conversion was achieved and 98% of raw material was turned waste. The most resent researches are showing progress in successful production of multiple products …”

Section: Organic Solventsmentioning

confidence: 99%

“…The most resent researches are showing progress in successful production of multiple products. 125,146,147,150 The design of biorefineries is considered to have three main objectives: (1) to ensure energy security where a large volume of biomass is produced, (2) to reduce environmental impacts associated with the production of chemical products, ie, less waste generation and less greenhouse gases emissions, 151 and (3) to develop rural areas. To design a biorefinery, the most widely used approaches are superstructures, conceptual design, and optimization.…”

Section: The Concept Of Biorefinerymentioning

confidence: 99%

Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Baig

Turcotte

2019

Int J Energy Res

View full text Add to dashboard Cite

Summary Production of bioethanol is winning support from masses because it is a workable choice to solve the problems associated with the fluctuating prices of crude petroleum oil, climatic change, and reducing non‐renewable fuel reserves. First‐generation biofuels are produced directly from food crops. The biofuel (bioethanol, biodiesel) is ultimately derived from the starch, sugar, animal fats, and vegetable oil that these crops provide. It is important to note that the structure of the biofuel itself does not change between generations, but rather the source from which the fuel is derived changes. Corn, wheat, and sugar cane are the most commonly used first‐generation bioethanol feed stocks. Lignocellulosic materials are used as a feed stock for the production of second‐generation bioethanol. The major production steps are (1) delignification, (2) depolymerisation, and (3) fermentation. Agricultural residues are waste materials produced through the processing of agricultural crops. The main reason to use of these agricultural residues to produce bioethanol is to convert waste to value added products. The main challenges are the low yield of the cellulosic hydrolysis process due to the presence of lignin and hemicellulose with cellulose. Pretreatments of lignocellulosic materials to remove lignin and hemicellulose are the techniques used to enhance the hydrolysis. Present review article comprehensively discusses the different pretreatment methods of delignification for ethanol production. Published literature on pretreatments from 1982 to 2018 has been studied. Perspectives, gaps in studies, and recommendations are given to fully describe implementation of eight prominent pretreatments (milling, pyrolysis, organic solvents, steam explosion, hot water treatments, ozonolysis, enzymatic delignification, and genetic modification) for future research. The energy and environmental features of lignocellulosic materials are elaborated to show a sustainable aspect of second‐generation biofuel. It was felt necessary to discuss the concept of bio refinery to make biofuel production financially more attractive as well because the future prospects of second‐generation biofuel are promising.

show abstract

“…The development of noncrop-based feedstock for bioethanol production has been considered an urgent policy agenda by the National Development and Reform Commission (NDRC), the main body of China’s energy policy making [13]. Currently, lignocellulosic bioethanol production has aroused great research interest as the feedstocks are cheap and abundant while avoiding the competition with food sources [14, 15]. However, the commercial production of bioethanol still remains at a nascent stage due to high enzyme costs and low efficacy of generation (both titers and yields) [16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced co-generation of cellulosic ethanol and methane with the starch/sugar-rich waste mixtures and Tween 80 in fed-batch mode

Fan

et al. 2019

Biotechnol Biofuels

View full text Add to dashboard Cite

Background The mixed-feedstock fermentation is a promising approach to enhancing the co-generation of cellulosic ethanol and methane from sugarcane bagasse (SCB) and molasses. However, the unmatched supply of the SCB and molasses remains a main obstacle built upon binary feedstock. Here, we propose a cellulose–starch–sugar ternary waste combinatory approach to overcome this bottleneck by integrating the starch-rich waste of Dioscorea composita Hemls. extracted residue (DER) in mixed fermentation. Results The substrates of the pretreated SCB, DER and molasses with varying ratios were conducted at a relatively low solids loading of 12%, and the optimal mixture ratio of 1:0.5:0.5 for the pretreated SCB/DER/molasses was determined by evaluating the ethanol concentration and yield. Nevertheless, it was found that the ethanol yield decreased from 79.19 ± 0.20 to 62.31 ± 0.61% when the solids loading increased from 12 to 44% in batch modes, regardless of the fact that the co-fermentation of three-component feedstock was performed under the optimal condition defined above. Hence, different fermentation processes such as fed-batch and fed-batch + Tween 80 were implemented to further improve the ethanol concentration and yield at higher solids loading ranging between 36 and 44%. The highest ethanol concentration of 91.82 ± 0.86 g/L (69.33 ± 0.46% of theoretical yield) was obtained with fed-batch + Tween 80 mode during the simultaneous saccharification and fermentation at a high solids loading of 44%. Moreover, after the ethanol recovery, the remaining stillage was digested for biomethane production and finally yielded 320.72 ± 6.98 mL/g of volatile solids. Conclusions Integrated DER into the combination of SCB and molasses would be beneficial for ethanol production. The co-generation of bioethanol and biomethane by mixed cellulose–starch–sugar waste turns out to be a sustainable solution to improve the overall efficacy in biorefinery.

show abstract

Temperature profiling to maximize energy yield with reduced water input in a lignocellulosic ethanol biorefinery

Cited by 16 publications

References 31 publications

Microbial Lipid Production from Corn Stover by the Oleaginous Yeast Rhodosporidium toruloides Using the PreSSLP Process

Microbial Lipid Production from Corn Stover by the Oleaginous Yeast Rhodosporidium toruloides Using the PreSSLP Process

Future prospects of delignification pretreatments for the lignocellulosic materials to produce second generation bioethanol

Enhanced co-generation of cellulosic ethanol and methane with the starch/sugar-rich waste mixtures and Tween 80 in fed-batch mode

Contact Info

Product

Resources

About