Total Solids Content: a Key Parameter of Metabolic Pathways in Dry Anaerobic Digestion

Overview

Journal Biotechnol Biofuels

Publisher Biomed Central

Specialty Biotechnology

Date 2013 Nov 23

PMID 24261971

Citations 11

Authors

Jean-Charles Motte

Eric Trably

Renaud Escudie

Jerome Hamelin

Jean-Philippe Steyer

Nicolas Bernet

Jean-Philippe Delgenes

Claire Dumas

Affiliations

Soon will be listed here.

Abstract

Background: In solid-state anaerobic digestion (AD) bioprocesses, hydrolytic and acidogenic microbial metabolisms have not yet been clarified. Since these stages are particularly important for the establishment of the biological reaction, better knowledge could optimize the process performances by process parameters adjustment.

Results: This study demonstrated the effect of total solids (TS) content on microbial fermentation of wheat straw with six different TS contents ranging from wet to dry conditions (10 to 33% TS). Three groups of metabolic behaviors were distinguished based on wheat straw conversion rates with 2,200, 1,600, and 1,400 mmol.kgVS-1 of fermentative products under wet (10 and 14% TS), dry (19 to 28% TS), and highly dry (28 to 33% TS) conditions, respectively. Furthermore, both wet and dry fermentations showed acetic and butyric acid metabolisms, whereas a mainly butyric acid metabolism occurred in highly dry fermentation.

Conclusion: Substrate conversion was reduced with no changes of the metabolic pathways until a clear limit at 28% TS content, which corresponded to the threshold value of free water content of wheat straw. This study suggested that metabolic pathways present a limit of TS content for high-solid AD.

Citing Articles

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Value Addition Employing Waste Bio-Materials in Environmental Remedies and Food Sector.

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Pham V, Kim J, Chang S, Chung W Microorganisms. 2021; 9(12).

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