Hydraulic irreversibility of ultrafiltration membrane fouling by humic acid: Effects of membrane properties and backwash water composition
Hydraulic irreversibility of ultrafiltration membrane fouling by humic acid: Effects of membrane properties and backwash water composition
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腐殖酸超滤膜污染的水力不可逆性：膜性能和反洗水成分的影响
DOI：
10.1016/j.memsci.2015.07.001
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发表时间：
2015-11-01
影响因子：
9.5
通讯作者：
Liang, Heng
中科院分区：
文献类型：
--
作者：
Chang, Haiqing;Qu, Fangshu;Liang, Heng
五种市售超滤（UF）膜：聚醚砜（PES，100 kDa），聚偏二氟乙烯（PVDF，100 kDa）和醋酸纤维素（CA，100、30和10 kDa），用腐殖酸（HA）溶液污染，并使用包括超纯水、一价阳离子（Na+）、二价阳离子（Ca 2+）、有机化合物（HA）和UF渗透物。分析了膜与原水组成的每种组合的水力不可逆污染和水力清洗效率（HCE）。总之，膜的性质和中水的组成影响水力不可逆污染。膜性能显著影响总污染，HCE主要受原水组成的影响。此外，HA和膜之间的粘附自由能与总污染相关性良好。超纯水对于反洗上级UP渗透物，并且适当组分（例如，Na+或HA）进一步改善HCE;然而，Ca 2+对HCE产生不利影响。此外，沉积的HA的去除与反冲洗期间从污垢层释放的Ca 2+的量一致。机理分析表明，反冲洗过程涉及污垢层膨胀、离子交换、双电层释放和竞争络合。(C)2015 Elsevier B. V.版权所有。
Five commercially available ultrabltration (UF) membranes: polyethersullone (PES, 100 kDa), polyvinylidene fluoride (PVDF, 100 kDa) and cellulose acetate (CA, 100, 30 and 10 kDa), were fouled with humic acid (HA) solutions and cleaned using various compositions of backwash water including ultra-pure water, monovalent cations (Na+), divalent cations (Ca2+), an organic compound (HA) and UF permeate. The hydraulically irreversible fouling and the hydraulic cleaning efficiency (HCE) for each combination of membrane and backwash water composition were analyzed. In summary, both the membrane properties and the backwash water composition affected hydraulically irreversible fouling. The membrane properties significantly affected the total fouling, and the HCE was primarily affected by the backwash water composition. Further, the adhesive free energy between HA and the membranes correlated well with the total fouling. Ultrapure water was superior to UP permeate for backwashing, and the presence of appropriate components (e.g., Na+ or HA) further improved the HCE; however, Ca2+ exerted detrimental impacts on the HCE. In addition, the removal of the deposited HA was consistent with the amount of Ca2+ released from the fouling layer during backwashing. Mechanistic analysis suggested that the backwashing process involves fouling layer swelling, ion exchange, electric double layer release and competitive complexation. (C) 2015 Elsevier B.V. All rights reserved.