Characterization of nutrient removal and microalgal biomass production on an industrial waste-stream by application of the deceleration-stat technique

Jonathan Van Wagenen, Mathias Leon Pape, Irini Angelidaki

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Industrial wastewaters can serve as a nutrient and water source for microalgal production. In this study the effluent of an internal circulation (IC) reactor anaerobically treating the wastes of a biotechnology production facility were chosen as the cultivation medium for Chlorella sorokiniana in batch and continuous cultures. The aim was to evaluate the rates of nutrient removal and biomass production possible at various dilution rates. The results demonstrate that the industrial wastewater served as a highly effective microalgae culture medium and that dilution rate strongly influenced algae productivity in a short light-path photobioreactor. Batch culture on undiluted wastewater showed biomass productivity of 1.33gL-1day-1, while removing over 99% of the ammonia and phosphate from the wastewater. Deceleration-stat (D-stat) experiments performed at high and low intensities of 2100 and 200 (μmol photon m2s-1) established the optimal dilution rates to reach volumetric productivity of 5.87 and 1.67gL-1day-1 respectively. The corresponding removal rates of nitrogen were 238 and 93mg L-1day-1 and 40 and 19mg L-1day-1 for phosphorous. The yield on photons at low light intensity was as high as had been observed in any previous report indicating that the waste stream allowed the algae to grow at its full potential.
Original languageEnglish
JournalWater Research
Volume75
Pages (from-to)301-311
Number of pages11
ISSN0043-1354
DOIs
Publication statusPublished - 2015

Keywords

  • Chlorella sorokiniana
  • Deceleration-stat
  • IC reactor
  • Microalgae productivity
  • Nutrient removal
  • Short light-path photobioreactor
  • Algae
  • Batch cell culture
  • Biomass
  • Light
  • Microorganisms
  • Nitrogen removal
  • Nutrients
  • Photobioreactors
  • Photons
  • Productivity
  • Ic reactors
  • Micro-algae
  • Effluents

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