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Reverse osmosis of diluted skim milk: Comparison of results obtained from vibratory and rotating disk modules

机译：稀释脱脂奶的反渗透：从振动和旋转磁盘模块获得的结果比较

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This paper investigates the reduction of ionic concentration and carbon oxygen demand (COD) in dairy process waters modelled by one volume of skim milk diluted with two volumes of water using shear-enhanced reverse osmosis. Initial COD and conductivity were, respectively, 36,000 mgO2L~(-1) and 2000 μS cm~(-1). We have compared the performances of a VSEP vibratory pilot and of a single rotating disk-stationary membrane module equipped with the same Desal AG membrane (Osmonics). Membrane shear rates were varied by changing the vibration frequency in the VSEP and the disk rotation speed or adding radial vanes in the other module. In all tests the permeate COD was reduced below 15 mg O2 L~(-1). Permeate fluxes reached a maximum of 180 L h~(-1) m~(-2) at a transmembrane pressure (TMP) of 4 MPa at initial concentration with the VSEP at its resonant frequency and with the disk equipped with 6 mm high vanes rotating at 2000 rpm. Permeate conductivity fell from 60 μS cm~(-1) at 1 MPa to about 18 μS cm~(-1) at 4 MPa. In concentration tests, corresponding permeate fluxes at the maximum volume reduction ratio reached (VRR = 8), were 55 L h~(-1) m~(-2) for the VSEP and 60 Lh~(-1) m~(-2) for the rotating disk at a TMP of 4 MPa. Permeate conductivities increased exponentially with VRR from 18 to 210 μS cm~(-1) for the rotating disk and to 250 μS cm~(-1) for the VSEP. However the mean conductivity of collected permeate varied from 38 μS cm~(-1) at highest shear rate to 60 at lower shear rates. This study shows that these filtration systems permit to obtain reusable water from this high initial COD model effluent with one single reverse osmosis step.
机译：本文研究了采用剪切增强反渗透技术，以一体积的脱脂乳用两体积的水稀释后，模拟的乳品加工用水中离子浓度和碳氧需求量（COD）的降低。初始COD和电导率分别为36,000 mgO2L〜（-1）和2000μScm〜（-1）。我们已经比较了VSEP振动飞行员和配备相同Desal AG膜（Osmonics）的单个旋转盘固定膜组件的性能。通过改变VSEP中的振动频率和磁盘旋转速度或在其他模块中添加径向叶片来改变膜的剪切速率。在所有测试中，透过水的COD均降低到15 mg O2 L〜（-1）以下。跨膜压（TMP）为4 MPa时，在初始浓度下，渗透液通量最大为180 L h〜（-1）m〜（-2），VSEP处于共振频率，并且圆盘装有6 mm高叶片以2000 rpm的转速旋转。渗透电导率从1 MPa下的60μScm〜（-1）降至4 MPa下的约18μScm〜（-1）。在浓度测试中，在达到最大体积减小比（VRR = 8）时，VSEP的相应渗透通量为55 L h〜（-1）m〜（-2），而60 Lh〜（-1）m〜（- 2）对于TMP为4 MPa的转盘。渗透率随VRR呈指数增长，从18到210μScm〜（-1）到旋转盘，到VSEP到250μScm〜（-1）。然而，所收集的渗透物的平均电导率从最高剪切速率下的38μScm〜（-1）变化到较低剪切速率下的60μscm〜（-1）。这项研究表明，这些过滤系统可以通过一个反渗透步骤从这种高初始COD模型废水中获得可重复使用的水。

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