Impact of hydraulic pressure on membrane deformation and trace organic contaminants rejection in pressure assisted osmosis (PAO)

Blandin, Gaëtan; Vervoort, Harm; D’Haese, Arnout; Schoutteten, Klaas; Bussche, Julie Vanden; Vanhaecke, Lynn; Myat, Darli Theint; Le‐Clech, Pierre; Verliefde, Arne

doi:10.1016/j.psep.2016.04.004

Cited by 41 publications

(26 citation statements)

References 44 publications

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“…For example, when the feed flow rate of 10 LPM was applied, the feed pressure drops were within the range of 0.059-0.061 bar and 0.081-0.135 bar for SW FO and PF FO, respectively. Interestingly, the feed pressure drop values were similar regardless of the employed draw flow rates, indicating less effect on the membrane deformation due to the hydraulic pressure difference in the module suggested in previous studies [34,35].…”

Section: Performance Of Serially Connected Fo Elementssupporting

confidence: 54%

Performance Comparison of Spiral-Wound and Plate-and-Frame Forward Osmosis Membrane Module

Lee

2020

Membranes

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We compared two representative forward osmosis (FO) modules—spiral-wound (SW) and plate-and-frame (PF)—to provide practical information for the selection of FO element for a large-scale FO process. The FO operating performance of commercially available SW FO and PF FO was explored under different membrane area and flow rate conditions. The performance trend as a function of the membrane was obtained by adjusting the number of serially connected elements. Although SW FO and PF FO elements exhibited comparable feed pressure drops, SW FO demonstrated a significantly higher draw channel pressure drop than PF FO. Furthermore, the significant draw pressure drop in SW FO increased the draw inlet pressure, consequently limiting the number of serially connected elements. For example, the maximum number of serially connected elements for the normal operation was three elements for SW FO (45.9 m2) but nine elements for PF FO (63 m2) when the flow rate of 10 LMP was applied for feed and draw streams. Additionally, a footprint analysis indicated that SW FO module exhibited a slightly larger footprint than PF FO. Under investigated conditions, PF FO exhibited relatively better performance than SW FO. Therefore, this pilot-scale FO study highlighted the need to reduce the flow resistance of SW FO draw channel to take advantage of the high packing density of the SW element.

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Section: Performance Of Serially Connected Fo Elementssupporting

confidence: 54%

Performance Comparison of Spiral-Wound and Plate-and-Frame Forward Osmosis Membrane Module

Lee

2020

Membranes

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“…Home-made submerged FO plates were designed and realized based on Kubota MF cartridges 203. In order to evaluate the impact of draw channel design on submerged FO module performances, 3 specific designs were tested: U-shape large-spacer module: U-shape draw channel design (as commonly found in spiral-wound FO modules [ 3 , 47 ] with draw channel spacers containing a 1.2-mm-thickness diamond-type polypropylene mesh spacer composed of two levels of filaments to promote turbulences [ 48 ] ( Figure 2 a). U-shape thin-spacer module: U-shape draw channel design with draw channel spacers containing a 0.76-mm-thickness diamond-type polypropylene mesh ( Figure 2 a).…”

Section: Methodsmentioning

confidence: 99%

“…U-shape large-spacer module: U-shape draw channel design (as commonly found in spiral-wound FO modules [ 3 , 47 ] with draw channel spacers containing a 1.2-mm-thickness diamond-type polypropylene mesh spacer composed of two levels of filaments to promote turbulences [ 48 ] ( Figure 2 a).…”

Section: Methodsmentioning

confidence: 99%

Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations

2018

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Submerged forward osmosis (FO) is of high interest for bioreactors, such as osmotic membrane bioreactor, microalgae photobioreactor, food or bioproduct concentration where pumping through pressurized modules is a limitation due to viscosity or breakage of fragile components. However, so far, most FO efforts have been put towards cross flow configurations. This study provides, for the first time, insights on mass transfer limitations in the operation of submerged osmotic systems and offer recommendations for optimized design and operation. It is demonstrated that operation of the submerged plate and frame FO module requires draw circulation in the vacuum mode (vacuum assisted osmosis) that is in favor of the permeation flux. However, high pressure drops and dead zones occurring in classical U-shape FO draw channel strongly disadvantage this design; straight channel design proves to be more effective. External concentration polarization (ECP) is also a crucial element in the submerged FO process since mixing of the feed solution is not as optimized as in the cross flow module unless applying intense stirring. Among the mitigation techniques tested, air scouring proves to be more efficient than feed solution circulation. However, ECP mitigation methodology has to be adapted to application specificities with regards to combined/synergetic effects with fouling mitigation.

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“…18 The accumulation of TrOCs in the draw solution loop (and release through RO) observed in FO-RO 19 can be a major limitation for OMBR-RO and should be evaluated and monitored; recalcitrant TrOCs can also accumulate in the mixed liquor. However, the combination of novel generation thin film composite (TFC) membranes with improved TrOCs rejection, 20 the biological degradation occurring in the OMBR (potentially enhanced by enzymatic degradation 21 ) and the periodical draw solution replacement can limit TrOCs accumulation in the draw solution. Other configurations such as combined OMBR/MBR (Tackling the salinity build-up section) or water reuse combined with seawater desalination (Fig.…”

Section: Can Ombr-ro Improve Water Quality and Safety?mentioning

confidence: 99%

Can osmotic membrane bioreactor be a realistic solution for water reuse?

et al. 2018

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A growing emphasis on water recycling resulted in intense research activity, aiming to develop and validate reliable and highquality water treatment processes at lowest cost. In parallel, significant advances in the field of osmotically driven processes have been obtained in the past decade. While the combination of membrane bioreactor (MBR) and reverse osmosis (RO) has become the preferred choice for water reuse, the osmotic membrane bioreactor (OMBR) has begun to be considered as a promising alternative. Based on the current state of knowledge, this paper critically asses the potential for OMBR to be implemented for water reuse application and highlights challenges to reach full scale operation. The initial vision of an energy-free osmotic gradient process is not realistic and its low fouling behaviour is still to be properly assessed. However, OMBR demonstrated unique features such as high rejection of contaminants and an absence of RO brine stream that can support its implementation, especially in the context of high end (potable, industrial) water reuse. However, to become a viable and effective technology for water reuse, significant research and development is still required. Tackling the salinity build-up, developing membranes and modules adapted to OMBR, evaluating long term performance and economics, validating removal of contaminants and developing design, maintenance and automatic control systems constitute critical topics to be considered in future research.

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Impact of hydraulic pressure on membrane deformation and trace organic contaminants rejection in pressure assisted osmosis (PAO)

Cited by 41 publications

References 44 publications

Performance Comparison of Spiral-Wound and Plate-and-Frame Forward Osmosis Membrane Module

Performance Comparison of Spiral-Wound and Plate-and-Frame Forward Osmosis Membrane Module

Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations

Can osmotic membrane bioreactor be a realistic solution for water reuse?

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