An advanced online monitoring approach to study the scaling behavior in direct contact membrane distillation

Lee, Jung Gil; Jang, Yongsun; Fortunato, Luca; Jeong, Sanghyun; Lee, Sang-Ho; Leiknes, TorOve; Ghaffour, Noreddine

doi:10.1016/j.memsci.2017.10.009

Cited by 68 publications

(30 citation statements)

References 31 publications

(37 reference statements)

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“…fouling behavior in MD, a real-time monitoring is necessary (Lee et al, 2018). Particularly for MD that is a thermal separation process and where the fouling structure is not maintained when operation is shut-downed and samples are taken from the membrane module.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

et al. 2018

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Fouling development in direct contact membrane distillation (DCMD) for seawater desalination was evaluated combining in-situ monitoring performed using optical coherence tomography (OCT) together with destructive techniques. The non-invasive monitoring with OCT provided a better understanding of the fouling mechanism by giving an appropriate sampling timing for the membrane autopsy. The on-line monitoring system allowed linking the flux trend with the structure of fouling deposited on the membrane surface. The water vapor flux trend was divided in three phases based on the deposition and formation of different foulants over time. The initial flux decline was due to the deposition of a 50-70 nm porous fouling layer consisting of a mixture of organic compounds and salts. Liquid chromatography with organic carbon detection (LC-OCD) analysis revealed the abundance of biopolymer in the fouling layer formed at the initial phase. In the second phase, formation of carbonate crystals on the membrane surface was observed but did not affect the flux significantly. In the last phase, the water vapor flux dropped to almost zero due to the deposition of a dense thick layer of sulfate crystals on the membrane surface.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

et al. 2018

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“…In agreement with other studies [ 69 , 70 ], the scaling observed on the membrane surface of no spacer ( Figure 5 b) and standard spacer ( Figure 5 c) cases were attributed to the barite crystals deposition, which is subsequently confirmed by EDX analysis ( Figure 5 ). The composition of SGPW led to the formation of barium sulfate (BaSO 4 ), which has low solubility in water resulting in its scaling on membrane surface [ 71 ]. In the case of hole-type spacer, SEM image ( Figure 5 d) revealed smaller particles spreading over the membrane area.…”

Section: Resultsmentioning

confidence: 99%

Hole-Type Spacers for More Stable Shale Gas-Produced Water Treatment by Forward Osmosis

et al. 2021

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An appropriate spacer design helps in minimizing membrane fouling which remains the major obstacle in forward osmosis (FO) systems. In the present study, the performance of a hole-type spacer (having holes at the filament intersections) was evaluated in a FO system and compared to a standard spacer design (without holes). The hole-type spacer exhibited slightly higher water flux and reverse solute flux (RSF) when Milli-Q water was used as feed solution and varied sodium chloride concentrations as draw solution. During shale gas produced water treatment, a severe flux decline was observed for both spacer designs due to the formation of barium sulfate scaling. SEM imaging revealed that the high shear force induced by the creation of holes led to the formation of scales on the entire membrane surface, causing a slightly higher flux decline than the standard spacer. Simultaneously, the presence of holes aided to mitigate the accumulation of foulants on spacer surface, resulting in no increase in pressure drop. Furthermore, a full cleaning efficiency was achieved by hole-type spacer attributed to the micro-jets effect induced by the holes, which aided to destroy the foulants and then sweep them away from the membrane surface.

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“…Thought the in-situ analysis was possible to evaluate the formation of carbonate and sulfate crystals over time (Figure 9). The use of OCT was then proposed as a tool to monitor the scaling in thermal process that employs membrane [53]. Recently, Bauer et al [54] used the OCT to quantify the area covered by the scaling and the flux decline in a membrane distillation process.…”

Section: Monitoring Inorganic Foulingmentioning

confidence: 99%

Fouling Monitoring in Membrane Filtration Systems

Fortunato¹

2020

Optical Coherence Tomography and Its Non-Medical Applications

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Membrane filtration systems are employed in the water industry to produce drinking water and for advanced wastewater treatment. Fouling is considered the main problem in membrane filtration systems. Fouling occurs when the biomass deposited on the membrane surface leads to a membrane performance decline. Most of the available techniques for characterization of fouling involve the analysis of membrane samples after membrane autopsies. This approach provides information ex-situ destructively at the end of the filtration process. Optical coherence tomography (OCT) gained attention in the last years as noninvasive imaging technique, capable of acquiring scans in-situ and nondestructively. The online OCT monitoring enables visualizing and studying the biomass deposition over time under continuous operation. This approach allows to relate the impact of the fouling on the process. In the last years, the suitability of OCT as in-situ and nondestructive tool for the study of fouling in membrane filtration systems has been evaluated. The OCT has been employed to study the fouling in different membrane geometry and configuration for the treatment of seawater and wastewater. Nowadays, the OCT is employed to better understand the role of biomass structure on the filtration mechanisms.

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An advanced online monitoring approach to study the scaling behavior in direct contact membrane distillation

Cited by 68 publications

References 31 publications

Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

Fouling development in direct contact membrane distillation: Non-invasive monitoring and destructive analysis

Hole-Type Spacers for More Stable Shale Gas-Produced Water Treatment by Forward Osmosis

Fouling Monitoring in Membrane Filtration Systems

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