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Influence of natural organic matter (NOM) characteristics on membrane rejection mechanisms of submerged ultrafiltration membrane reactor

机译：天然有机物（NOM）特性对淹没式超滤膜反应器膜截留机理的影响

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摘要

The main objective of this experiment is to study on the influence of NOM characteristics on the membrane rejection mechanisms. Polysulfone (PSF) membrane formed by a simple phase inversion technique was used in this research. The experiments were carried out through a hydrophobic 68 kDA MWCO polysulfone and a hydrophilic 50 kDA MWCO cellulose acetate of a submerged UF membrane reactor. The Ulu Pontian Kecil river water was fractionated into several components which were hydrophobic (HPO), transphilic (TPI) and hydrophilic (HPI) fractions using DAX-8 and XAD-4 ion exchange resins. The isolated surface water components were characterized by dissolved organic carbon (DOC), ultra violet absorbance at 254 nm (UV254nm), specific ultraviolet absorbance (SUVA) or a measure of relative abundance of relative aromaticity, etc. The experimental results showed that the hydrophilic component of NOM to exhibit the worst flux decline despite lesser DOC and UV rejection compared to other fractions (HPO and TPI). The electrostatic interaction has been found to play a more influential role than steric hindrance mechanism when filtering nom fractions with a negatively charged membrane. The quantitative results of Resistance in-Series Model analysis on clean and foaled membranes elucidated that both reversible and irreversible fouling mechanisms occurred during surface water filtration.
机译：该实验的主要目的是研究NOM特性对膜截留机理的影响。本研究使用通过简单的相转化技术形成的聚砜（PSF）膜。通过浸没式超滤膜反应器的疏水性68 kDA MWCO聚砜和亲水性50 kDA MWCO醋酸纤维素进行实验。使用DAX-8和XAD-4离子交换树脂，将乌鲁笨珍凯西尔河水分馏为几个部分，分别为疏水（HPO），透水（TPI）和亲水（HPI）馏分。分离出的地表水成分具有溶解有机碳（DOC），在254 nm处的紫外线吸收（UV254nm），比紫外线吸收率（SUVA）或相对芳香度的相对丰度等特征。实验结果表明，亲水性尽管DOC和UV截留率比其他馏分（HPO和TPI）低，但NOM的组分仍显示出最差的通量下降。已发现当用带负电的膜过滤名义分数时，静电相互作用比空间位阻机理更具影响力。在清洁和起泡的膜上进行的阻力串联模型分析的定量结果表明，在地表水过滤过程中同时发生了可逆和不可逆的结垢机理。

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