Study of membrane fouling and cleaning in spiral wound modules using ultrasonic time-domain reflectometry

Zhang, Zh.X.; Greenberg, Alan R.; Krantz, William B.; Chai, G.-Y.

doi:10.1016/s0927-5193(03)80007-4

Cited by 24 publications

(15 citation statements)

References 6 publications

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“…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%

“…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]. The steady-state waveform of distilled water was considered as the reference and the waveform of fouled membrane was considered as the test waveform.…”

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%

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

et al. 2017

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“…The magnitude of the reflected and transmitted waves is a function of the difference between the acoustic impedances (Z) of the media. The amplitude (A) of the reflected wave relative to the incident wave is given by [26] A ¼…”

Section: Ultrasonic Spectrum Analysismentioning

confidence: 99%

“…However, it is difficult to quantitatively interpret the signals received during ultrasonic test as a result of the superimposition of the ultrasonic wave forms. Therefore, the differential signal analysis was used to investigate the foulant deposition processes on the membrane surface in this study [26][27][28]. The resolution of ultrasonic testing exceeds the theoretical limit by a considerable margin when using the differential signals [27].…”

Section: Ultrasonic Spectrum Analysismentioning

confidence: 99%

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

Zhang

Hou

et al. 2015

Desalination

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“…The systematic changes of acoustic responses from the inside surfaces of hollow fiber in the time-and amplitude-domain with the operating time were observed during the fouling experiments. Especially Zhang et al [18] described the extension of UTDR for the measurement of fouling and cleaning in commercial spiral-wound membrane modules. They introduced two shift factors based upon changes in the signal amplitude and arrival time to analyze the incomprehensible acoustic response respectively.…”

Section: Introductionmentioning

confidence: 99%

In situ monitoring of membrane fouling in spiral-wound RO modules by UTDR with a sound intensity modeling

An¹,

Lin²,

Li³

et al. 2011

Desalination and Water Treatment

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ab s t r ac tThe ultrasonic time-domain reflectometry (UTDR) technique with a new signal analysis protocolsound intensity calculation and modeling was developed to detect the calcium-sulfate fouling in a commercial spiral-wound reverse osmosis (RO) membrane module. The fouling experiments were carried out with 2.0 g/L calcium sulfate solution. A 2.25 MHz focused transducer was used and mounted on the outside of the module housing. Results show that the ultrasound is capable to penetrate through the multiple layers of membrane. The systematic changes on the ultrasonic reflected signals with fouling time were observed by UTDR. The total sound intensity of the response signals obtained declined with the fouling time and reached a minimum at about 25 h of fouling, and then increased in the following time. The changes in the total sound intensity were correlated to the deposition and formation of the fouling. The entire acoustic spectra were divided into three sections according to the arrival time. The subsection sound intensity indicated that the fouling layers deposited on the membranes in regular order from inner to outer of the spiral-wound module. Gravimetric and scanning electron microscopy (SEM) analyses revealed the membranes near the pure water tube of the module suffered from much severely fouling. Overall, this study demonstrates that the UTDR with a suitable signal analysis protocol can provide valuable insight concerning fouling in a spiral-wound membrane module.

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Study of membrane fouling and cleaning in spiral wound modules using ultrasonic time-domain reflectometry

Cited by 24 publications

References 6 publications

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

Fouling in Membrane Distillation, Osmotic Distillation and Osmotic Membrane Distillation

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

In situ monitoring of membrane fouling in spiral-wound RO modules by UTDR with a sound intensity modeling

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