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Vol 34(2018) N 3 p. 42-52; DOI 10.21519/0234-2758-2018-34-3-42-52
M.A. Gladchenko*, S.N. Gaydamaka, V.P. Murygina, and S.D. Varfolomeev

Anaerobic Conversion of Lignocellulose to Materials for Biofuel Obtaining, Volatile Fatty Acids and Ethanol

Department of Chemical Enzymology, Lomonosov Moscow State University, 119992, Moscow Russia

*gladmarina@yandex.ru
Received - 26.02.2018; Accepted - 12.04.2018

References

The processes of oxidative depolymerization and acidic hydrolysis have consistently been used to the pretreatment of lignocellulosic biomass (wheat straw, sawdust and lignin) which permitted to obtain high content of soluble organic compounds in the hydrolysate (44-94 g COM/L) and to enhance the RS concentration from 1% to 36%. The introduction of the Clostridium acetobutylicum bacteria in the acidogenic biocatalyst resulted in even greater increase in the content of volatile fatty acids and ethanol in the end product. The maximum among the studied substrates yields of butyric acid and ethanol were observed when the pretreated straw was hydrolyzed (27% (0,82 g/L) and 17,4% (0,44 g/L), respectively). It was shown that the addition of glycerol as a substrate makes it possible to increase the output of butyric and acetic acids as a result of the pretreated biomass conversion; glycerol added to straw up to the ratio of 1:1 enhanced the maximum butyric acid and VFA yields up to 32% (0.96 g/L) and 72% (2.67 g/L), respectively.

straw, sawdust, lignin, oxidative depolymerization, hydrolysis, anaerobic processes, biocatalyst.



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