Syntrophy between fermentative and purple phototrophic bacteria to treat and valorize carbohydrate-rich wastewaters

Marta Cerruti*, Guillaume Crosset-Perrotin, Mythili Ananth, Julius Laurens Rombouts, David G. Weissbrodt

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
44 Downloads (Pure)

Abstract

Fermentative chemoorganoheterotrophic bacteria (FCB) and purple photoorganoheterotrophic bacteria (PPB) are two interesting microbial guilds to process carbohydrate-rich wastewaters. Their metabolic interactions have been studied in pure cultures or co-cultures, but little is known about mixed cultures. We studied the effect of reactor regimes (batch/chemostat) and illumination modes (continuous infrared light, dark, or light/dark cycles) on glucose conversions and process ecology of the interactions between FCB and PPB in mixed cultures. In batch, FCB (>80 % of sequencing read counts) outcompeted PPB, under any light conditions. In chemostat under continuous and alternating irradiance, three FCB populations were enriched (>70 %), while Rhodobacteraceae (PPB) made 30 % of the community. Glucose fermentation products were linked to the dominant FCB. Continuous culturing helped maintaining FCB and PPB in syntrophy: PPB grew on glucose metabolites produced by FCB. Engineering the association between FCB and PPB in mixed-culture processes can help to treat and valorize carbohydrate-rich aqueous waste.

Original languageEnglish
Article number101348
JournalBioresource Technology Reports
Volume22
DOIs
Publication statusPublished - 2023

Keywords

  • Chemoorganoheterotrophs
  • Mixed-culture fermentation
  • Photoorganoheterotrophs
  • Resource recovery
  • Syntrophy

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