Phosphorus Recovery by Adsorption from the Membrane Permeate of an Anaerobic Membrane Bioreactor Digesting Waste-Activated Sludge

The recovery of phosphorus (P) from waste activated sludge (WAS) is a promising approach for sustainable resource management. During the anaerobic digestion of WAS, orthophosphate is released, and this P species is favorable for adsorption recovery. In the present study, an anerobic membrane bioreac...

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Bibliographic Details
Published in:Membranes (Basel) 2022-01, Vol.12 (1), p.99
Main Authors: Hafuka, Akira, Kimura, Katsuki
Format: Article
Language:English
Subjects:
Activated sludge
adsorbent
Adsorbents
Adsorption
Aluminum
Anaerobic digestion
Biogas
Bioreactors
Chemical oxygen demand
Electric industries
Flow velocity
Hydraulic retention time
Membranes
methane
Micelles
Orthophosphate
Phosphorus
phosphorus release
Resource management
Resource recovery
Retention
Retention time
sewage sludge
Sewage treatment plants
Sludge
Sludge digestion
Sodium hydroxide
Solubilization
Water treatment
Zirconium
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Summary:The recovery of phosphorus (P) from waste activated sludge (WAS) is a promising approach for sustainable resource management. During the anaerobic digestion of WAS, orthophosphate is released, and this P species is favorable for adsorption recovery. In the present study, an anerobic membrane bioreactor (AnMBR) with a P-adsorption column was developed to generate biogas from WAS and to recover P from membrane permeate simultaneously. The effects of the hydraulic retention time (HRT) and solid retention time (SRT) of the AnMBR on P solubilization were investigated. As a result, the maximum P solubilization was 21% when the HRT and SRT were 45 days and 100 days, respectively. Orthophosphate in the membrane permeate was adsorbed and recovered using a mesoporous material called zirconium sulfate-surfactant micelle mesostructure (ZS) in the column. The adsorbed P could be desorbed from the ZS with a NaOH solution, and P was recovered as a concentrated solution by a factor of 25. When the HRT was 19 days, the biogas yield and biogas production rate were 0.26 L/g-VS and 0.123 L/L/d, respectively. The average methane content in the biogas was 80%. The developed membrane-based process may be effective for resource recovery from WAS.
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes12010099