Acid precipitation followed by microalgae (Chlorella vulgaris) cultivation as a new approach for poultry slaughterhouse wastewater treatment

Ruly Terán Hilares, Kiara A. Garcia Bustos, Fabio P. Sanchez Vera, Gilberto J. Colina Andrade, David A. Pacheco Tanaka

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Poultry slaughterhouse wastewater (PSW) contains high organic matter and nutrients requiring thus a special treatment before its final disposal. In this work, acid precipitation (H2SO4) followed by microalgae “Chlorella vulgaris” cultivation both in batch and continuous processes was studied as an alternative method for PSW treatment. By reducing the pH value of PSW from 6 to 7 to 4, about 80% of the total chemical oxygen demand (CODT) was removed as sludge. In the supernatant, the COD residual was efficiently removed (83%) by microalgae in the batch process, using an internal-loop concentric tube photobioreactor (4.5 L). Moreover, in continuous process, after 89 h, the COD value resulted lower than 200 mg L-1 and 1.2 g L-1 of microalgae in the output line. The proposed PSW treatment method is promising from economic and environmental viewpoints, since the microalgal biomass can be valued in a biorefinery context.

Original languageEnglish
Article number125284
JournalBioresource Technology
Volume335
DOIs
StatePublished - Sep 2021

Keywords

  • Acid precipitation
  • Continuous process
  • Microalgae cultivation
  • Poultry slaughterhouse wastewater (PSW)
  • Wastewater treatment

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