Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7020002 | Journal of Membrane Science | 2018 | 23 Pages |
Abstract
This study demonstrated the application of a new type of interlayer-free cobalt-doped silica membrane in treating ammonia solutions by pervaporation applied towards wastewater treatment. For enhanced hydrothermal stability, cobalt-doped silica (CoSi) membranes with increasing cobalt concentrations from 1 to 35â¯mol% were prepared and evaluated, namely CoSi-1, 5, 20 and 35. These membranes exhibited high water fluxes of 66â¯Lâ¯mâ2 hâ1 for CoSi-1 and 15.5â¯Lâ¯mâ2 hâ1 for CoSi-35 at 45â¯Â°C. The fluxes of the membranes decreased with increasing cobalt concentration; while the rejection to total nitrogen (TN, ammonia nitrogen) increased and hence allowed selective passage of water molecules. Enhanced thermostability was observed for the membranes, particularly CoSi-35 that exhibited TN rejection up to 99% at high temperature of 65â¯Â°C and highly alkaline environment (pHâ¯>â¯10). Also, the CoSi-35 membrane showed stable performance in treating ammonia present in industry wastewater by achieving stable TN and mineral rejections of 97% and 99%, respectively. Fouling was observed and confirmed by SEM morphological analysis and EDX elemental inspection. The results indicated the deposition of low solubility salts such as CaSO4.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Xing Yang, Sean Sheridan, Lining Ding, David K. Wang, Simon Smart, João C. Diniz da Costa, Audra Liubinas, Mikel Duke,