Evaluation of Phosphorus Recovery from Wastewater via Aerobic Granule Forward Osmosis Membrane Bioreactor

• Main Authors: Li-Ying Huang, 黃麗霙
• Other Authors: Duu-Jong Lee
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/57970887159053557620

碩士 === 國立臺灣大學 === 化學工程學研究所 === 104 === 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.