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Title: Salt accumulation in osmotic membrane bioreactor
Authors: Su, Alvin Guo Jie.
Keywords: DRNTU::Engineering
Issue Date: 2013
Abstract: With population growing at an unprecedented rate together with the drastic climate change, issue on water scarcity will be more severe in the near future. Instead of relying on a finite supply of portable water from the hydrological cycle, desalination and waste water reclamation are some avenues for which portable water are made available to those lack basic sanitation. Given the drawbacks of conventional activated sludge and the reverse osmosis system, a new osmotic membrane bioreactor (OMBR) has been developed to address the issue on energy consumption which at the same time provide higher process efficiency. OMBR makes use of forward osmosis and biological process to treat waste water. Although several advantages have been brought about with the introduction of the OMBR system, limited knowledge on the system operation is available to assess if this technology is viable for industrial application. With older literatures focusing on the selection of draw solute and membrane characterization, this report focused on how elevated salt conditions would affect the performance of the OMBR and the fouling of the membrane, In this study, the operation of the OMBR system had been monitored continuously for 120 days. It was observed that the high rejection property of the FO membrane coupled with the back diffusion of salt from the draw solution resulted in gradual increase in salinity in the mixed liquor. In addition, the water flux of the system was very much dependent on the driving force as the profile for these two parameters were generally very similar. Analyses performed at the end of the experiment revealed that fouling propensity dependent on aeration had a significant impact on the flux level and the nitrification process. The microscopic observation showed that the growth of biofilm would alter the surface property of the membrane. Further analysis by CLSM indicated the manner in which biofilm developed on the membrane surface.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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