A new ultrasonic cleaning model for predicting the flux recovery of the UF membrane fouled with humic acid
A new ultrasonic cleaning model for predicting the flux recovery of the UF membrane fouled with humic acid
复制标题
超滤膜超声波清洗模型的建立及其对腐殖酸污染膜通量恢复的预测
DOI：
10.1016/j.jece.2022.107156
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发表时间：
2022-01-10
影响因子：
7.7
通讯作者：
Wang, Zhan
中科院分区：
文献类型：
--
作者：
Luo, Huijia;Wang, Zhan
超声波清洗是控制膜污染的一种很有前途的替代方法。目前，进一步推广应用的当务之急是建立预测瞬时膜通量的模型。在本研究中，提出了一种考虑功率强度和温度的新模型，并用超声空化理论和扩展的Derjaguin-Landau-Verwey-Overbeek(XDLVO)理论揭示了超声清洗的机理。结果表明，对于被腐植酸(HA)污染的聚醚砜(PES)超滤膜，模型的预测值与实验值(sigma<；1.23%)吻合较好，对聚偏氟乙烯(PVDF)超滤膜(sigma<；0.72%)和实际污水(sigma<；1.18%)的预测精度较高。同时，HA滤饼阻力在1min内脱除79.10，达到88.91%，有效膜面积增加0.42~0.57倍，膜通量恢复率(FR)可在100W、30℃下5min内达到91.07%。此外，超声清洗的主要机理是超声空化微射流动能(6.28×10~(-10)J)远大于HA污染物与膜表面的相互作用能(7.92×10~(-13)J)。
Ultrasonic cleaning is an alternative promising method to control the membrane fouling. At present, the urgent task of further promoting its application is to establish a model to predict the instantaneous membrane flux. In this study, a new model was proposed by considering the power intensity and temperature, and the ultrasonic cleaning mechanism was revealed with ultrasonic cavitation theory and extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. Results showed that the predictions of the model were in good agreement with the experimental data (sigma < 1.23%) for the polyethersulfone (PES) ultrafiltration (UF) membrane fouled with humic acid (HA) and its accuracy was higher for the polyvinylidene fluoride (PVDF) UF membrane (sigma < 0.72%) or actual sewage (sigma < 1.18%). Meanwhile, the HA cake resistance was removed 79.10 similar to 88.91% and the corresponding available membrane area increased 0.42-0.57 times within 1 min, and the membrane flux recovery (FR) could be reached to 91.07% within 5 min (100 W and 30 degrees C). In addition, the main mechanism of ultrasonic cleaning was that the kinetic energy of the ultrasonic cavitation microjet (6.28 x10(-10) J) was much bigger than the interaction energy between the HA foulants and the membrane surface (7.92 x10(-13) J).