Influence of temperature and temperature difference in the performance of forward osmosis desalination process
Influence of temperature and temperature difference in the performance of forward osmosis desalination process
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DOI：
10.1016/j.memsci.2012.05.065
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发表时间：
2012-10
影响因子：
9.5
通讯作者：
S. Phuntsho;S. Vigneswaran;J. Kandasamy;Seungkwan Hong;Sangyoup Lee;H. Shon
中科院分区：
文献类型：
--
作者：
S. Phuntsho;S. Vigneswaran;J. Kandasamy;Seungkwan Hong;Sangyoup Lee;H. Shon
正渗透（FO）是一种新兴的低能耗海水淡化技术。在许多其他因素中，汲取溶液（DS）和进料溶液（FS）的温度在影响FO工艺的性能方面起重要作用。在这项研究中，温度和温差对FO过程的性能的影响进行了研究的水和溶质通量。通过仅升高其中一种溶液（DS或FS）来维持温差。结果表明，从25°C到35°C，温度每升高一度，水通量平均增加1.2%，而从25° C到45 ° C，温度每升高一度，水通量平均增加2.3%。通过仅升高DS来提供温差也显著增强了水通量，尽管其低于在等温条件下操作的FO工艺。然而，仅升高FS的温度没有显著提高水通量，尽管其高于在25°C下操作的FO工艺。这在FO工艺中具有重要意义，因为需要热能的DS的总质量显著小于所使用的总FS。在FO过程中的温度的影响，如通过在溶液的热力学性质的变化和各种浓度极化效应也详细解释。
Forward osmosis (FO) is an emerging technology for low energy desalination. Amongst the many other factors, temperature of the draw solution (DS) and feed solution (FS) plays an important role in influencing the performance of the FO process. In this study, the influence of the temperature and the temperature difference on the performance of FO process has been studied in terms of water and solute fluxes. Temperature difference was maintained by elevating only one of the solutions (either DS or FS). The results indicate that, water flux on average increases by up to 1.2% for every degree rise in temperature from 25°C to 35°C while this rise is 2.3% from 25°C to 45°C. Providing a temperature difference by elevating only the DS also enhanced the water flux significantly, although it was lower than FO process operated at isothermal conditions. However, elevating only the temperature of FS did not significantly improve the water flux although it was higher than the FO process operated at 25°C. This has significant implications in FO process because the total mass of the DS requiring heat energy is significantly less than the total FS used. The influences of temperature in the FO process such as through changes in the thermodynamic properties of the solutions and the various concentration polarisation effects are also explained in details.