Influence of headspace composition on product diversity by sulphate reducing bacteria biocathode.

Bioresour Technol

TERI University, 10 Institutional Area, Vasant Kunj, New Delhi 110070, India; TERI, Darbari Seth Block, India Habitat Centre, New Delhi 110003, India. Electronic address:

Published: August 2014

AI Article Synopsis

  • A mixed culture of sulphate-reducing bacteria (TERI-MS-003) was used to create a biocathode on activated carbon fabric for converting volatile fatty acids into various organic compounds under specific electrical conditions.
  • The product composition varied significantly based on the gas environment in the reactor; sealing the reactor led to the production of succinate, ethanol, hydrogen, glycerol, and propionate, while sparging with nitrogen favored acetone and other alcohols.
  • The study emphasizes how the composition of gases in the reactor's headspace influences the outcomes of microbial electro-synthesis and the necessity for effective separation and recovery strategies for practical applications.

Article Abstract

Mixed culture of sulphate reducing bacteria named TERI-MS-003 was used for development of biocathode on activated carbon fabric fastened to stainless steel mesh for conversion of volatile fatty acids to reduced organic compounds under chronoamperometric conditions of -0.85V vs. Ag/AgCl (3.5M KCl). A range of chemicals were bioelectrosynthesized, however the gases present in headspace environment of the bioelectrochemical reactor governed the product profile. Succinate, ethanol, hydrogen, glycerol and propionate were observed to be the predominant products when the reactor was hermetically sealed. On the other hand, acetone, propionate, isopropanol, propanol, isobutyrate, isovalerate and heptanoate were the predominant products when the reactor was continuously sparged with nitrogen. This study highlights the importance of head space composition in order to manoeuvre the final product profile desired during a microbial electro-synthesis operation and the need for simultaneously developing effective separation and recovery strategies from an economical and practical standpoint.

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http://dx.doi.org/10.1016/j.biortech.2014.03.075DOI Listing

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