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Optimization of an enriched mixed culture to increase PHA accumulation using industrial saline complex wastewater as a substrate. | LitMetric

AI Article Synopsis

  • Polyhydroxyalkanoates (PHA) are promising alternatives to traditional plastics, being biodegradable and producible from high-organic-content wastewater, thus supporting waste recovery.
  • The study improved PHA production in sequencing batch reactors (SBR) by adding a settling stage after the feast phase, which helped eliminate non-PHA-storing microorganisms and unwanted substances.
  • Results indicated significant increases in PHA yield and storage capacity, along with shifts in microbial community composition that favored PHA production, underscoring the effectiveness of the settling stage.

Article Abstract

Polyhydroxyalkanoates (PHA) appear as good candidates to substitute conventional petroleum-based plastics since they have similar properties but with the advantage of being biodegradable. Wastewater streams with high organic content are feasible substrates for PHA production resulting in an opportunity for waste recovery. One of the main challenges is the optimization of the selection of microorganisms with high PHA storage capacity. This microbial selection is performed in sequencing batch reactors (SBR) operated under an aerobic feast/famine (F/F) regime. In the present study, a settling stage was added at the end of the feast phase of the enrichment cycle of a SBR fed with pre-acidified cooked mussel processing wastewater (containing up to 12 g NaCl/L). Settling and subsequent supernatant discharge favoured the wash-out of non-accumulating microorganisms as well as the removal of substances that enhanced their undesired development (proteins and carbohydrates). Microbial analysis performed by fluorescence in situ hybridization (FISH) technique showed shifts in the microbial community; the presence of genus Paracoccus increased whereas genera Comamonas decreased. Moreover, the process efficiency was improved with the increase of the PHA production yield (Y) and the maximum PHA storage capacity (max. PHA) from 0.48 to 0.72 Cmmol/Cmmol and from 40 to 60 wt%, respectively. The polymer composition also changed, its HB:HV ratio varied from 83:17 to 70:30. Results obtained in the present study showed that settling after the feast phase promoted the removal of carbon sources that did not contribute to PHA production and the washout of non-storing bacteria, which favoured the culture enrichment.

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Source
http://dx.doi.org/10.1016/j.chemosphere.2020.125873DOI Listing

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