In situ investigation of combined organic and colloidal fouling for nanofiltration membrane using ultrasonic time domain reflectometry

Li, Xianhui; Zhang, Hongwei; Hou, Yining; Yong-liang, Gao; Li, Jianxin; Guo, Wenshan; Ngo, Huu Hao

doi:10.1016/j.desal.2015.02.005

Cited by 24 publications

(11 citation statements)

References 37 publications

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“…The UTDR results of NF experiments showed that the fouling layer obtained from the combined organic-colloidal fouling (mixed silica and bovine serum albumin (BSA) and silica and NaCl solution) was denser than that obtained from the colloidal fouling layer in the presence of NaCl. The formation of the denser fouling layer was due to the electrostatic interactions between foulants and membrane surface as well as the electrostatic interactions among the foulants due to absorption of BSA onto silica [116]. Taheri, et al [119] used UTDR technique to provide a good estimation of the fouling layer thickness formed during RO tests.…”

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

“…UTDR was used for fouling detection by different authors in filtration processes. As an example, Li, et al [116] investigated the fouling behavior of mixed silica-BSA solution and silica-NaCl solution using UTDR technique in NF membranes (see Figure 6). The UTDR results of NF experiments showed that the fouling layer obtained from the combined organic-colloidal fouling (mixed silica and bovine serum albumin (BSA) and silica and NaCl solution) was denser than that obtained from the colloidal fouling layer in the presence of NaCl.…”

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

“…UTDR is a non-invasive technique used to monitor the deposition of combined organic and colloidal fouling on membrane surface [116]. This does not require any sample preparation and is based on the propagation of mechanical waves.…”

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

“…The reflection and transmission can occur when an ultrasonic wave encounters an interface between two media. More details can be found in [116][117][118]. UTDR technique coupled with differential signal analysis was used to investigate the combined fouling deposition processes on membrane surface [118].…”

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

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Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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Various membrane separation processes are being used for seawater desalination and treatment of wastewaters in order to deal with the worldwide water shortage problem. Different types of membranes of distinct morphologies, structures and physico-chemical characteristics are employed. Among the considered membrane technologies, membrane distillation (MD), osmotic distillation (OD) and osmotic membrane distillation (OMD) use porous and hydrophobic membranes for production of distilled water and/or concentration of wastewaters for recovery and recycling of valuable compounds. However, the efficiency of these technologies is hampered by fouling phenomena. This refers to the accumulation of organic/inorganic deposits including biological matter on the membrane surface and/or in the membrane pores. Fouling in MD, OD and OMD differs from that observed in electric and pressure-driven membrane processes such electrodialysis (ED), membrane capacitive deionization (MCD), reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), microfiltration (MF), etc. Other than pore blockage, fouling in MD, OD and OMD increases the risk of membrane pores wetting and reduces therefore the quantity and quality of the produced water or the concentration efficiency of the process. This review deals with the observed fouling phenomena in MD, OD and OMD. It highlights different detected fouling types (organic fouling, inorganic fouling and biofouling), fouling characterization techniques as well as various methods of fouling reduction including pretreatment, membrane modification, membrane cleaning and antiscalants application.

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Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

Section: Ultrasonic Time Domain Reflectometry (Utdr)mentioning

confidence: 99%

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Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…Ultrasonic signal responses of the clean NF membrane (blue line) and differential signals (red line) obtained at 300 min of fouling operation with the feed solution of 1000 mg/L silica and 1000 mg/L NaCl under a constant pressure operation. Adapted with permission from[116], Copyright Elsevier, 2015.…”

mentioning

confidence: 99%