Flocculation and Flotation to Recover Protein-Enriched Biomasses from Shrimp Boiling and Peeling Process Waters: A Case Study

Bita Forghani*, Ann-Dorit Moltke Sørensen, Johan Johannesson, Tore C. Svendsen, Ingrid Undeland

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A novel integrated process for the recovery of protein-enriched biomasses from shrimp boiling water (SBW) and shrimp peeling water (SPW) was investigated by combining flocculation (F) and dissolved air flotation (DAF) into an F-DAF process. Alginate and carrageenan were used as flocculants. It was found that the protein yield from SPW and SBW in the F-DAF process was 68-97% and 26-45%, respectively. This led to a reduction in protein content of the influent SBW and SPW (12.4 and 1.4 g/L, respectively) by up to 76% and 85%, resulting in outlets with 2.9 and 0.2 g/L protein, respectively. Further, the F-DAF recovery process concentrated the proteins of SBW and SPW up to 7 and 29 times, respectively, thus, generating a protein-enriched biomass. After spray drying, biomass from SBW had up to 61% proteins, and out of the total amino acids, up to 47% were essential ones. Further, the spray dried powder contained up to 23% total lipids, 2.7% long chained n-3 polyunsaturated fatty acids and 49.7 mg/g total astaxanthin. The studied F-DAF recovery system can thus be successfully used for recovering nutrients from process waters generated during the production of peeled shrimps.

Original languageEnglish
JournalACS Sustainable Chemistry and Engineering
Volume8
Issue number26
Pages (from-to)9660-9668
ISSN2168-0485
DOIs
Publication statusPublished - 2020

Keywords

  • Alginate
  • Biomass
  • Carrageenan
  • Circular economy
  • Protein recovery
  • Shrimp processing
  • Wastewater

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