Efficient Recovery of Organic Matter from Municipal Wastewater by a High-Rate Membrane Bioreactor Equipped with Flat-Sheet Ceramic Membranes

High-rate processes have been investigated for the recovery of organic matter from municipal wastewater. High-rate membrane bioreactors (HR-MBRs) may simultaneously achieve the increased recovery of carbon and high effluent quality, although control of membrane fouling is extremely difficult. To add...

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Bibliographic Details
Published in:Membranes (Basel) 2023-03, Vol.13 (3), p.300
Main Authors: Rocco, Michael Joseph, Hafuka, Akira, Tsuchiya, Toru, Kimura, Katsuki
Format: Article
Language:English
Subjects:
Backwash
Bioreactors
Carbon
carbon recovery
Carbon sequestration
Ceramic materials
Ceramics
Chemical oxygen demand
chemically enhanced backwash
Effluents
Energy consumption
Experiments
Fouling
granular scouring
membrane fouling
Membrane processes
Membrane separation
Membranes
Municipal wastewater
Organic matter
Purification
Raw wastewater
Recovery
Residence time distribution
Sewage
Sludge
Wastewater
Wastewater treatment
Wastewater treatment plants
Water treatment
Water treatment plants
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Summary:High-rate processes have been investigated for the recovery of organic matter from municipal wastewater. High-rate membrane bioreactors (HR-MBRs) may simultaneously achieve the increased recovery of carbon and high effluent quality, although control of membrane fouling is extremely difficult. To address the severe fouling in HR-MBRs, the combination of granular scouring and frequent chemically enhanced backwashing was examined. The use of robust flat-sheet ceramic membranes enabled the application of those cleaning strategies. Experiments were carried out at an existing wastewater treatment plant. To operate as a high-rate system, the bioreactor solid residence time and hydraulic residence time were set at 0.5 days and 1.6 h, respectively. Although a relatively high flux of 20 L m h was applied, the proposed HR-MBR exhibited a very low fouling rate of 1.3 kPa/day. The system could recover >70% of the carbon from raw wastewater, whereas the concentration of chemical oxygen demand in the effluent was lowered to
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes13030300