Evaluation of Phosphorus Recovery from Wastewater via Aerobic Granule Forward Osmosis Membrane Bioreactor
Date Issued
2015
Date
2015
Author(s)
Huang, Li-Ying
Abstract
Phosphorus recovery has been a global issue due to the depletion of phosphorus resource and the contamination of its release to the aquatic environment. Precipitation formation is a promising approach to recover phosphorus by extracting phosphate and ammonium ions in wastewaters; however, the operating costs need to be considered when the nitrogen and phosphorus loading increase. In this study, a modified process is suggested, using an aerobic granule forward osmosis membrane bioreactor (AG-FOMBR) to estimate the recovery efficiency. In this bioreactor, organic matters were digested by the biological process while phosphate ions were rejected by the Thin-film Composite (TFC) FO membrane and accumulated. Aerobic granules, as a compact form of microbial aggregates with good settleability and capability to treat high-strength wastewaters, were seeded to compare the membrane water fluxes with the sludge form. The AG-FOMBR showed 95.8%, 37.4%, and 100% overall removal of PO43--P, NH4+-N, and TOC in the first stage, and 95.5%, 46.0%, and 100% in the second stage, respectively. The solutes leakage of TFC membrane is measured and discussed. Recovery benefits through AG-FOMBR, OMBR, and FO (directly removing phosphorus from synthetic wastewater by FO) are evaluated. The global phosphorus recovery efficiency in this suggested reactor was 97.0% in average during the 75-day operation.
Subjects
Phosphorus recovery
aerobic granule
forward osmosis
membrane bioreactor
Thin-film composite membrane
Type
thesis
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ntu-104-R02524061-1.pdf
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