Use of fermentation processes for improving the dissolution of phosphorus and its recovery from waste activated sludge

Recycling phosphorus from waste activated sludge has attracted a lot of interest to tackle the problem of phosphorus stocks depletion and the increase in food demand. In this study, the use of fermentation processes was investigated to enhance phosphorus dissolution from waste activated sludge to im...

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Bibliographic Details
Published in:Environmental technology 2022-04, Vol.43 (9), p.1307-1317
Main Authors: Bareha, Y., Saoudi, M., Santellani, A. C., Le Bihan, A., Picard, S., Mebarki, C., Cunha, M., Daumer, M.-L.
Format: Article
Language:English
Subjects:
Activated sludge
bioacidification
dark fermentation
Depletion
Dissolution
Environmental Engineering
Environmental Sciences
Fatty Acids, Volatile
Fermentation
Magnesium
Organic acids
Phosphorus
phosphorus recovery
Recycling
Sewage
Sludge
Solubility
Substrates
Syrup
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Summary:Recycling phosphorus from waste activated sludge has attracted a lot of interest to tackle the problem of phosphorus stocks depletion and the increase in food demand. In this study, the use of fermentation processes was investigated to enhance phosphorus dissolution from waste activated sludge to improve its recycling. Two fermentation processes, bioacidification and dark fermentation, were used on two different sludges fermented with wheat starch syrup in continuous operating conditions. Hydrogen yield from the co-substrate fermentation with waste activated sludge reached 3.9 mmolH 2 .gCOD cosubstrate −1 yield during dark fermentation process and was negligible during bioacidification. Dissolved phosphorus in the waste activated sludge increased by 68% during bioacidification and by 43% during dark fermentation. In both processes, phosphorus dissolution was accompanied by iron, calcium and magnesium dissolution. Results show that fermentation enhances phosphorus dissolution in waste activated sludge to improve its recovery along with hydrogen and organic acids.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2020.1827301