Growth potential of microalgae on ammonia-rich anaerobic digester effluent for wastewater remediation

•Multiple microalgae strains grow on ammonia-rich anaerobic digester permeate.•Cultivation on anaerobic digester permeate did not affect microalgae growth.•Microalgae cultivation reduces toxic concentrations of nitrogen in permeate. Microalgae strains, Chlorella sorokiniana, Chlorella vulgaris, Scen...

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Published in:Algal research (Amsterdam) 2022-03, Vol.62, p.102613, Article 102613
Main Authors: Rude, Kayla, Yothers, Cody, Barzee, Tyler J., Kutney, Serena, Zhang, Ruihong, Franz, Annaliese
Format: Article
Language:English
Subjects:
Ammonia
Anaerobic digestate
Biomass productivity
Cultivation
Growth inhibition
Nutrient remediation
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Summary:•Multiple microalgae strains grow on ammonia-rich anaerobic digester permeate.•Cultivation on anaerobic digester permeate did not affect microalgae growth.•Microalgae cultivation reduces toxic concentrations of nitrogen in permeate. Microalgae strains, Chlorella sorokiniana, Chlorella vulgaris, Scenedesmus acutus f. alternans, and Scenedesmus obliquus, can be successfully cultivated on ammonia-rich ultrafiltered anaerobically digested food waste, referred to as food waste permeate (FWP), and its ammonia-stripped counterpart, stripped food waste permeate (SFWP). Using a three-stage screening method, these four microalgae strains were determined to be viable for cultivation on diluted FWP and SFWP out of 10 strains initially investigated. Cultivation utilizing FWP supported similar or higher microalgae growth compared to cultivation on synthetic media. Nutrient remediation efficiencies vary across species and conditions, with C. sorokiniana cultures reaching >95% reductions in both phosphorus and nitrogen concentrations when cultivated on SFWP. Analysis of both the growth and remediation capacities of the four microalgae strains on FWP demonstrate their potential use as an alternative treatment method for nutrient-dense waste streams.
ISSN:2211-9264
2211-9264
DOI:10.1016/j.algal.2021.102613