An extended standard blocking filtration law for exploring membrane pore internal fouling due to rate-determining adsorption
An extended standard blocking filtration law for exploring membrane pore internal fouling due to rate-determining adsorption
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用于探索由于速率决定吸附导致的膜孔内部污染的扩展标准阻塞过滤定律
DOI：
10.1016/j.seppur.2018.12.009
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发表时间：
2019-04
影响因子：
8.6
通讯作者：
T. David Waite
中科院分区：
文献类型：
--
作者：
Kang Xiao;Yinghui Mo;Jianyu Sun;Mingyu Wang;Shuai Liang;Xiaomao Wang;Xia Huang;T. David Waite
由于污染物吸附到孔壁上而造成的膜内部污染是污染的一个重要方面。经典的内垢“标准阻挡定律”简单地假设了瞬时吸附，即吸附量随着过滤液体体积的增加而线性增长，这不足以描述具有不同吸附速率的真实内垢。在这项研究中，提出了一个扩展的标准阻挡定律，适用于含时间吸附的情况，并得到了形式为DR/dV∼RN(其中Ri是过滤阻力和Vis滤液体积)的表达式。通过疏水膜和亲水膜对模型多糖(藻酸盐)溶液的微滤实验，验证了该定律的两种终极情形，即特征指数为N≈1.5(类似于经典的标准阻塞)的第一类足够快速的吸附和与≈2.5足够缓慢的吸附的第二类。第一类定律和第二类定律之间的转变与吸附和过滤传质的速率有关。扩展的定律提供了一种改进的工具来评估内部污染，特别是与亲水性物质(如多糖)在亲水膜中的吸附有关的污染。
Membrane internal fouling due to foulant adsorption onto the pore walls is a critical aspect of fouling. The classical “standard blocking law” for internal fouling simplistically assumes instantaneous adsorption such that the adsorbed amount grows linearly with the filtered liquid volume, which is inadequate to describe realistic internal fouling with varied adsorption rates. In this study, an extended standard blocking law for scenarios involving time dependent adsorption is proposed and yields an expression of the form dR/dV∼RN(whereRis filtration resistance andVis filtrate volume). Two ultimate scenarios of the law, i.e. the1st-kindfor sufficiently fast adsorption with the characteristic exponentN≈ 1.5 (similar to the classical standard blocking) and the2nd-kindfor sufficiently slow adsorption withN≈ 2.5 are experimentally verified via microfiltration of model polysaccharide (alginate) solutions using hydrophobic and hydrophilic membranes. Transition between the1st-kindand2nd-kindlaws is related to the rates of adsorption versus filtrational mass transfer. The extended law provides an improved tool to evaluate internal fouling, particularly that associated with adsorption of hydrophilic matter (such as polysaccharides) into hydrophilic membranes.
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