Hybrid forward osmosis-membrane distillation system: Demonstration of technical feasibility
Hybrid forward osmosis-membrane distillation system: Demonstration of technical feasibility
复制标题
DOI：
10.1016/j.jwpe.2019.101042
复制
发表时间：
2020-02
影响因子：
7
通讯作者：
Linnet Zohrabian;N. Hankins;R. Field
中科院分区：
文献类型：
--
作者：
Linnet Zohrabian;N. Hankins;R. Field
正向渗透 (FO) 和膜蒸馏 (MD) 的结合有可能为全球日益增长的清洁水需求提供解决方案。然而，为了最大限度地提高渗透产量，需要准确预测系统行为、平衡水传输率以及实施合适的汲取解决方案。目前，缺乏全面的数学工具，需要进一步开发绘图解决方案。在本研究中，开发了一个经过实验验证的数学模型来模拟 FO-MD 系统。使用包括氯化钠 (NaCl)、四乙基溴化铵 (TEAB) 和聚二烯丙基二甲基氯化铵 (PDAC) 在内的提取溶质来表征各个 FO 和 MD 渗透通量。然后使用 0.5M NaCl、TEAB 和 PDAC 运行 FO-MD 系统。结果表明，FO 中的结垢更为严重，并且所有系统中都发现水传输率不平衡。实验结果和模型用于预测MD进料温度和错流速度调整，以实现每种汲取溶液的系统水平衡。这种平衡的结果是，使用 NaCl、TEAB 和 PDAC 的渗透物产量得到了提高。这项研究表明，当通过数学模型优化系统性能时，FO-MD 系统是水净化的一个有前途的候选者。
The hybridisation of forward osmosis (FO) and membrane distillation (MD) has the potential to offer a solution to the increasing worldwide demand for clean water. However, accurate prediction of system behaviour, balancing of water transfer rates and the implementation of a suitable draw solution are needed to maximise permeate production. Currently, there is a lack of comprehensive mathematical tools available and further draw solution developments are required. In this study, an experimentally validated mathematical model was developed to simulate the FO-MD system. Draw solutes including sodium chloride (NaCl), tetraethylammonium bromide (TEAB) and polydiallyldimethylammonium chloride (PDAC), were used to characterise individual FO and MD permeate fluxes. The FO-MD system was then run using 0.5 M NaCl, TEAB and PDAC. The results showed that fouling was more significant in FO, and water transfer rate imbalances were identified in all systems. The experimental results and model were used to predict MD feed temperature and cross-flow velocity adjustments to achieve system water balance for each draw solution. As a result of this balancing, permeate production using NaCl, TEAB and PDAC was enhanced. This study suggests that the FO-MD system is a promising candidate for water purification when system performance is optimised through mathematical modelling.