Novel approach for sizing forward osmosis membrane systems
Novel approach for sizing forward osmosis membrane systems
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DOI：
10.1016/j.memsci.2017.07.019
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发表时间：
2017-11
影响因子：
9.5
通讯作者：
S. Mondal;R. Field;J. Wu
中科院分区：
文献类型：
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作者：
S. Mondal;R. Field;J. Wu
针对顺流和逆流两种流动结构，给出了理想正向渗透膜系统尺寸的解析解。它们是质量平衡方程的积分解，包括表示跨膜传递的方程。盐通道假定为零，但考虑了浓度极化。所提出的解不需要基于对数平均驱动力的近似，而当存在质量从传输面的一侧转移到另一侧时，仅是近似。其次，用对数平均近似计算的面积与用解析解计算的面积的比较表明，在逆流情况下，前者在高恢复时会产生显着误差。第三，还阐述了矿化度、流量比和流量布置的不同组合下的潜在采收率。
Analytical solutions for sizing ideal Forward Osmosis membrane systems are developed for both co-current and counter-current flow configurations. They are integral solutions of the mass balance equations, including the one representing transfer across the membrane. Salt passage is assumed to be zero but allowance is made for concentration polarisation. The solutions presented obviate the need for approximations based upon a log mean driving force which are only mere approximations when there is transfer of mass from one side of the transfer surface to the other. Secondly a comparison between the estimates of areas using a log-mean approximation and the calculated areas using the analytical solution shows that the former will generate significant errors at high recoveries for the case of counter-current flow. Thirdly the potential recovery is also elucidated for various combinations of salinity, flow rate ratios and flow arrangement.