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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Evaluation of the performance of tight-UF membranes with respect to NOM removal using effective MWCO,molecular weight,and apparent diffusivity of NOM
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Evaluation of the performance of tight-UF membranes with respect to NOM removal using effective MWCO,molecular weight,and apparent diffusivity of NOM

机译：使用有效的MWCO，分子量和NOM的表观扩散系数评估超滤膜在去除NOM方面的性能

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摘要

Concepts for the effective MWCO of tight-UF membranes,and apparent: diffusion coefficients for NOM,were introduced to determine the mechanisms influencing NOM removal and to explain the various behaviors of NOM removal by UF membranes with different hydrophobicities,permeability,and surface charges.Colloidal NOM (COM) and non-colloidal hydrophobic NOM (NCD HP) constituents were chosen for the evaluation of two different UF membranes.For a relatively hydrophobic,relatively high permeability,and less negatively charged UF membrane,the hydrophobic fractions of COM were preferentially removed and were also removed by a size exclusion mechanism (i.e.,both hydrophobic interaction and size exclusion mechanisms).The NCD HP exhibited no such preferential removal of the hydrophobic fractions,but could be removed by a size exclusion mechanism (i.e.,only size exclusion mechanism).With a relatively hydrophilic,relatively low permeability,and more negatively charged UF membrane,COM exhibited no preferential removal of the hydrophobic fractions,but could be removed by a size exclusion mechanism (i.e.,only size exclusion mechanism) Whereas the hydrophobic fractions of the NCD HP were preferentially removed,these could not be removed by a size exclusion mechanism (i.e.,only hydrophobia interaction mechanism).The apparent diffusion coefficients of NOM,as determined from NOM diffusion experiments using a diffusion cell equipped with a regenerated cellulose membrane,were much lower than those calculated by the Stokes-Einstein relation.The diffusion coefficient of NOM is expected to be used to predict and explain NOM transport behaviors in tight-UF membranes.
机译：引入了紧密超滤膜有效MWCO的概念，以及明显的：NOM的扩散系数，以确定影响NOM去除的机理，并解释了具有不同疏水性，渗透性和表面电荷的UF膜去除NOM的各种行为。选择胶体NOM（COM）和非胶体疏水NOM（NCD HP）成分来评估两种不同的UF膜。对于疏水性相对较高，渗透性相对较高且带负电荷的UF膜，COM的疏水部分优先NCD HP不会表现出这种优先去除疏水性部分的效果，但可以通过尺寸排阻机制（即仅尺寸排阻）去除，也可以通过尺寸排阻机制（即疏水相互作用和尺寸排阻机制）去除。具有相对亲水性，相对较低的渗透性和带负电的UF膜，COM没有表现出疏水性部分的有效去除，但可以通过尺寸排阻机制（即仅尺寸排阻机制）去除，而NCD HP的疏水部分优先被去除，而不能通过尺寸排阻机制将其去除（即仅疏水性相互作用的机理）.NOM的表观扩散系数是通过使用配备有再生纤维素膜的扩散池进行的NOM扩散实验确定的，远低于通过Stokes-Einstein关系计算得出的值。可用于预测和解释致密超滤膜中的NOM传输行为。

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