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Article

Designing Efficient Processes for Sustainable Bioethanol and Bio-Hydrogen Production from Grass Lawn Waste

Institute of Chemical Engineering Sciences, Stadiou, Platani, 26504 Patras, Greece
Academic Editor: Encarnación Ruiz Ramos
Molecules 2020, 25(12), 2889; https://doi.org/10.3390/molecules25122889
Received: 30 May 2020 / Revised: 20 June 2020 / Accepted: 21 June 2020 / Published: 23 June 2020
(This article belongs to the Special Issue Efficient Technology for the Pretreatment of Biomass III)
The effect of thermal, acid and alkali pretreatment methods on biological hydrogen (BHP) and bioethanol production (BP) from grass lawn (GL) waste was investigated, under different process schemes. BHP from the whole pretreatment slurry of GL was performed through mixed microbial cultures in simultaneous saccharification and fermentation (SSF) mode, while BP was carried out through the C5yeast Pichia stipitis, in SSF mode. From these experiments, the best pretreatment conditions were determined and the efficiencies for each process were assessed and compared, when using either the whole pretreatment slurry or the separated fractions (solid and liquid), the separate hydrolysis and fermentation (SHF) or SSF mode, and especially for BP, the use of other yeasts such as Pachysolen tannophilus or Saccharomyces cerevisiae. The experimental results showed that pretreatment with 10 gH2SO4/100 g total solids (TS) was the optimum for both BHP and BP. Separation of solid and liquid pretreated fractions led to the highest BHP (270.1 mL H2/g TS, corresponding to 3.4 MJ/kg TS) and also BP (108.8 mg ethanol/g TS, corresponding to 2.9 MJ/kg TS) yields. The latter was achieved by using P. stipitis for the fermentation of the hydrolysate and S. serevisiae for the solid fraction fermentation, at SSF. View Full-Text
Keywords: pretreatment; fermentation; hydrolysis; grass lawn; ethanol; hydrogen; whole slurry; separation; process scheme pretreatment; fermentation; hydrolysis; grass lawn; ethanol; hydrogen; whole slurry; separation; process scheme
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MDPI and ACS Style

Antonopoulou, G. Designing Efficient Processes for Sustainable Bioethanol and Bio-Hydrogen Production from Grass Lawn Waste. Molecules 2020, 25, 2889. https://doi.org/10.3390/molecules25122889

AMA Style

Antonopoulou G. Designing Efficient Processes for Sustainable Bioethanol and Bio-Hydrogen Production from Grass Lawn Waste. Molecules. 2020; 25(12):2889. https://doi.org/10.3390/molecules25122889

Chicago/Turabian Style

Antonopoulou, Georgia. 2020. "Designing Efficient Processes for Sustainable Bioethanol and Bio-Hydrogen Production from Grass Lawn Waste" Molecules 25, no. 12: 2889. https://doi.org/10.3390/molecules25122889

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