Application of phagotrophic algae in waste activated sludge conversion and stabilization.
algal production
phagotrophic algae
resource recovery
waste activated sludge
Journal
Water environment research : a research publication of the Water Environment Federation
ISSN: 1554-7531
Titre abrégé: Water Environ Res
Pays: United States
ID NLM: 9886167
Informations de publication
Date de publication:
Sep 2021
Sep 2021
Historique:
revised:
15
02
2021
received:
03
12
2020
accepted:
25
02
2021
pubmed:
9
3
2021
medline:
9
9
2021
entrez:
8
3
2021
Statut:
ppublish
Résumé
Phagotrophic algae can consume bacteria that are the predominant microorganisms present in the waste activated sludge (WAS) generated from municipal wastewater treatment processes. In this study, we developed a combined ultrasonication-phagotrophic algal process for WAS conversion. The ultrasonic pretreatment released small volatile solids (VS) including bacteria from WAS flocs. A phagotrophic alga Ochromonas danica then grew by consuming more than 80% of the released VS, with approximately 30% (w/w) algal cell yield. The process reduced the overall WAS VS by 42.4% in 1 day, comparing very favorably with the 27% reduction in 10 days by aerobic digestion. For stabilizing the solids remaining from the ultrasonic step, the total oxygen uptake required was 65%-92% lower than that for the original WAS, indicating substantially reduced aeration cost. Overall, this novel process enhanced the WAS digestion at lower energy requirements and produced microalgae for other potential uses. © 2021 Water Environment Federation PRACTITIONER POINTS: At least 80% of released VS from WAS can be processed by phagotrophic algae. Significant amounts of algae can be produced from WAS. Ultrasonication-phagotrophic algal process can make sludge management more sustainable.
Substances chimiques
Sewage
0
Waste Water
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1660-1668Informations de copyright
© 2021 Water Environment Federation.
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