Fluorescence enabled direct visual observation for diagnosis of ultrafiltration membrane fouling by bi-disperse submicron particle suspensions
Fluorescence enabled direct visual observation for diagnosis of ultrafiltration membrane fouling by bi-disperse submicron particle suspensions
复制标题
荧光可以直接目视观察双分散亚微米颗粒悬浮液对超滤膜污染的诊断
DOI：
10.1111/wej.12349
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发表时间：
2018
影响因子：
2
通讯作者：
Autin O
中科院分区：
文献类型：
--
作者：
Autin O
虽然直接观测(DO)方法可以描述超微米颗粒的反向传输，但现有技术无法区分亚微米颗粒，而亚微米颗粒是造成膜污染的主要原因。因此，在这项研究中，我们引入了一种支持荧光的直接目视观察(RLF-DVO)方法，以允许直观地描述横流过滤过程中亚微米颗粒的传输。对于直径超过0.25微米的颗粒，可以实现颗粒识别；然而，这取决于颗粒浓度和所采用的错流速度。然而，这远远低于当前技术的检测下限(约3微米)。在由亚微米颗粒组成的二元分散体的过滤过程中，在检测到跨膜压力变化之前观察到了沉积，这支持了DO在污染诊断中的重要作用。根据在本研究期间所作的观察，提出了将进一步提高分辨率的建议。重要的是，这项研究表明，RLF-DVO可以实时描述错流过滤过程中亚微米颗粒的传输。
Whilst direct observation (DO) methodologies can describe back‐transport of supra‐micron particles, present technologies are unable to discriminate submicron particles, which are primarily responsible for membrane fouling. In this study, we therefore introduce a fluorescence enabled direct visual observation (RLF‐DVO) methodology to permit visual characterisation of submicron particle transport during cross‐flow filtration. Particle discrimination was achievable for particle diameters exceeding 0.25 µm; however, this was dependent upon particle concentration and the cross‐flow velocity employed. Nevertheless, this is considerably below the detection limit of current techniques (around 3 µm). During filtration of a binary dispersion comprised of submicron particles, deposition was observed before a change in transmembrane pressure was detected, which underpins the important role of DO for fouling diagnosis. Based on observations made during this study, recommendations are proposed that will further improve resolution. Importantly, this study demonstrates RLF‐DVO can provide real‐time description of submicron particle transport during cross‐flow filtration.