Response of a three-stage process for PHA production by mixed microbial cultures to feedstock shift: Impact on polymer composition

Anouk F. Duque, Catarina S S Oliveira, Inês T D Carmo, Ana R. Gouveia, Filipa Pardelha, Ana M. Ramos, Maria A M Reis

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Polyhydroxyalkanoates (PHA) can be produced by mixed microbial cultures (MMC) using a three-stage process. An attractive feature of MMC for PHA production is the ability to use waste/surplus feedstocks. In this study, the effect of a feedstock shift, mimicking a seasonal feedstock scenario and/or as a strategy for controlling polymer composition, on a MMC PHA production process was assessed using cheese whey (CW) and sugar cane molasses (SCM) as model feedstocks. The acidogenic stage responded immediately to the feedstock shift by changing the fermented products profile, with acetate and butyrate being the main acids produced from CW, while for SCM propionate and valerate were the dominant products. The fermentation process was then quite stable during long term operation. The PHA culture selection stage also responded quickly to the fermented feestocks shift, generating a polymer whose composition was linearly dependent on the concentration of HV and HB precursors produced in the acidogenic stage. The selected culture reached a maximum PHA content of 56% and 65% with fermented SCM and CW, respectively. Mixing fermented CW and SCM, in equal volume proportions, demonstrated the possibility of using different fermented feedstocks for tailoring polymer composition.

Original languageEnglish
Pages (from-to)276-288
Number of pages13
JournalNew Biotechnology
Volume31
Issue number4(SI)
DOIs
Publication statusPublished - 25 Jun 2014

Keywords

  • VOLATILE FATTY-ACIDS
  • SUGAR-CANE MOLASSES
  • OIL MILL EFFLUENTS
  • WASTE-WATER
  • POLYHYDROXYBUTYRATE PRODUCTION
  • BIODEGRADABLE POLYMERS
  • POLYHYDROXYALKANOATES
  • SUBSTRATE
  • FERMENTATION
  • STRATEGIES

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