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Effect of gas sparging on flux enhancement and phytochemical properties of clarified pineapple juice by microfiltration

机译：气体喷射对澄清菠萝汁微滤通量和植物化学性质的影响

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Membrane fouling is a major obstacle in the application of microfiltration. Several techniques have been proposed to enhance the permeate flux during microfiltration. Gas sparging is a hydrodynamic method for improving the performance of the membrane process. In this study, a 0.2 μm hollow fiber microfiltration membrane was used to study the effect of cross flow velocity (CFV) and gas injection factor (ε) on the critical and limiting flux during microfiltration of pineapple juice. In addition, the phytochemical properties of clarified juice were investigated. In the absence of gas sparging, the critical and limiting flux increased as the CFV or shear stress number increased. The use of gas sparging led to a remarkable improvement in both the critical and limiting flux but it was more effective at the lower CFV (1.5 ms~(-1)), compared to those at higher CFV (2.0 and 2.5 ms~(-1)). When the gas injection factor was applied at 0.15, 0.25 and 0.35 with a CFV of 1.5 ms~(-1), the enhancement of 55.6%, 75.5% and 128.2% was achieved for critical flux, while 65.8%, 69.7% and 95.2% was achieved for limiting flux, respectively. The results also indicated that the use of gas sparging was an effective method to reduce reversible fouling and external irreversible fouling rather than internal irreversible fouling. In addition, the CFV and gas sparging did not affect pH, total soluble solids, colour, total phenolic content and the antioxidant property of the clarified juice. The L-ascorbic acid and total vitamin C were significantly decreased when the higher CFV and high gas injection factor were applied. The results also indicated that the use of gas sparging with low CFV was beneficial for flux enhancement while most of the phytochemical properties of the clarified juice was preserved.
机译：膜污染是应用微滤的主要障碍。已经提出了几种提高微滤过程中渗透通量的技术。气体喷射是一种改善膜工艺性能的流体力学方法。在这项研究中，使用0.2μm中空纤维微滤膜研究了菠萝汁微滤过程中的横流速度（CFV）和气体注入因子（ε）对临界通量和极限通量的影响。另外，研究了澄清汁的植物化学性质。在没有气体喷射的情况下，临界流量和极限流量会随着CFV或切应力值的增加而增加。气体喷射的使用显着改善了临界通量和极限通量，但与较低CFV（1.5 ms〜（-1））相比，它在较高CFV（2.0和2.5 ms〜（-）时更有效。 1））。当CFV为1.5 ms〜（-1）时，将气体注入因子应用于0.15、0.25和0.35时，临界通量提高了55.6％，75.5％和128.2％，而65.8％，69.7％和95.2分别达到了限制通量的％。结果还表明，使用气体喷射是减少可逆结垢和外部不可逆结垢而不是内部不可逆结垢的有效方法。此外，CFV和气体喷射不会影响pH值，总可溶性固形物，颜色，总酚含量和澄清果汁的抗氧化性能。当使用较高的CFV和较高的气体注入因子时，L-抗坏血酸和总维生素C显着降低。结果还表明，使用低CFV的气体喷射有助于提高通量，同时保留了澄清果汁的大部分植物化学特性。

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