Efficient Phosphorus Recovery from Municipal Wastewater Using Enhanced Biological Phosphorus Removal in an Anaerobic/Anoxic/Aerobic Membrane Bioreactor and Magnesium-Based Pellets

Municipal wastewater has been identified as a potential source of natural phosphorus (P) that is projected to become depleted in a few decades based on current exploitation rates. This paper focuses on combining a bench-scale anaerobic/anoxic/aerobic membrane bioreactor (MBR) and magnesium carbonate...

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Bibliographic Details
Published in:Membranes (Basel) 2022-02, Vol.12 (2), p.210
Main Authors: Eghombi, Elvis, Kim, Hyunsik, Choi, Yang-Hun, Baek, Mi-Hwa, Nadagouda, Mallikarjuna N, Park, Pyung-Kyu, Chae, Soryong
Format: Article
Language:English
Subjects:
Adsorption
Aerobic capacity
anaerobic/anoxic/aerobic membrane bioreactor
Bioreactors
Carbon
Carbon sources
Chemical oxygen demand
Chemical precipitation
Continuous flow
Effluents
enhanced biological phosphorus removal mechanism
Ethanol
Extracellular polymers
Magnesium
Magnesium carbonate
membrane fouling
Membrane processes
Membrane separation
Membranes
Municipal wastewater
Nitrates
Pathogens
Pellets
Phosphorus
Phosphorus removal
Recovery
Sludge
Wastewater
Water treatment
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Summary:Municipal wastewater has been identified as a potential source of natural phosphorus (P) that is projected to become depleted in a few decades based on current exploitation rates. This paper focuses on combining a bench-scale anaerobic/anoxic/aerobic membrane bioreactor (MBR) and magnesium carbonate (MgCO )-based pellets to effectively recover P from municipal wastewater. Ethanol was introduced into the anoxic zone of the MBR system as an external carbon source to improve P release via the enhanced biological phosphorus removal (EBPR) mechanism, making it available for adsorption by the continuous-flow MgCO pellet column. An increase in the concentration of P in the MBR effluent led to an increase in the P adsorption capacity of the MgCO pellets. As a result, the anaerobic/anoxic/aerobic MBR system, combined with a MgCO pellet column and ethanol, achieved 91.6% P recovery from municipal wastewater, resulting in a maximum P adsorption capacity of 12.8 mg P/g MgCO through the continuous-flow MgCO pellet column. Although the introduction of ethanol into the anoxic zone was instrumental in releasing P through the EBPR, it could potentially increase membrane fouling by increasing the concentration of extracellular polymeric substances (EPSs) in the anoxic zone.
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes12020210