Abstract

Tomato juice with high molecular weight components (high foulants) creates a turbid appearance as well as high fouling and a substantial flux decline in membrane applications. For this purpose, the surface modification of polyethersulfone (PES) microfiltration (MF) membranes was investigated by corona discharge to improve fouling propensities for clarifying tomato juice. The results revealed that corona discharge changed the surface hydrophilicity, morphology, and antifouling performance of the membranes. However, it has not made any substantial changes to mechanical properties. The hydrophilicity of the modified membranes with the reduction of contact angle (CA) from 53° to 10°, increased. Accordingly, the tomato juice flux of the modified membranes increased from 11 to 26 kg m⁻² h⁻¹ (∼2.4 times). Moreover, the reduction of the cake resistance as the main fouling mechanism (1.81 × 10¹² m⁻¹) was 1.4 times, and the enhancement of the flux recovery ratio (27%) was 2 times higher than of the neat PES membrane.

摘要

含有高分子量成分（高污垢物）的番茄汁会产生浑浊的外观以及高污垢和膜应用中的通量大幅下降。为此，通过电晕放电研究了聚醚砜（PES）微滤（MF）膜的表面改性，以改善澄清番茄汁的结垢倾向。结果表明，电晕放电改变了膜的表面亲水性、形貌和防污性能。然而，它并没有对机械性能做出任何实质性的改变。随着接触角（CA）从53°减小到10°，改性膜的亲水性增加。因此，改性膜的番茄汁通量从11 kg m -2 h -1 增加到26 kg m ^-2 h ^-1（~2.4 倍）。^{此外，与纯PES膜相比，作为主要结垢机理的滤饼阻力（1.81×10 12} m ^-1 ）降低了1.4倍，通量恢复率（27%）提高了2倍。