Influence of Membrane Intrusion on Permeate‐Sided Pressure Drop During High‐Pressure Reverse Osmosis

Kleffner, Christine; Braun, Gerd; Antonyuk, Sergiy

doi:10.1002/cite.201800104

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…Spacers are mechanical supports between membrane layers used in modules to allow fluid flow in an open channel and promote mixing to reduce fouling and transport rejected substances from the membrane surface [21]. However, spacer designs need to balance appropriate mixing with low pressure drops for economical operation of the modules, leading to research and implementation of a wide range of spacer designs to optimize this tradeoff [22]. Novel spacer designs in FO do not need the high mechanical support of RO spacers, due to the lower operating pressures, resulting in the use of a 'dot-spacer' design specifically for FO draw-side operation [23].…”

Section: Introductionmentioning

confidence: 99%

Impact of FO Operating Pressure and Membrane Tensile Strength on Draw-Channel Geometry and Resulting Hydrodynamics

et al. 2020

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In an effort to improve performances of forward osmosis (FO) systems, several innovative draw spacers have been proposed. However, the small pressure generally applied on the feed side of the process is expected to result in the membrane bending towards the draw side, and in the gradual occlusion of the channel. This phenomenon potentially presents detrimental effects on process performance, including pressure drop and external concentration polarization (ECP) in the draw channel. A flat sheet FO system with a dot-spacer draw channel geometry was characterized to determine the degree of draw channel occlusion resulting from feed pressurization, and the resulting implications on flow performance. First, tensile testing was performed on the FO membrane to derive a Young’s modulus, used to assess the membrane stretching, and the resulting draw channel characteristics under a range of moderate feed pressures. Membrane apex reached up to 67% of the membrane channel height when transmembrane pressure (TMP) of 1.4 bar was applied. The new FO channels considerations were then processed by computational fluid dynamics model (computational fluid dynamics (CFD) by ANSYS Fluent v19.1) and validated against previously obtained experimental data. Further simulations were conducted to better assess velocity profiles, Reynolds number and shear rate. Reynolds number on the membrane surface (draw side) increased by 20% and shear rate increased by 90% when occlusion changed from 0 to 70%, impacting concentration polarisation (CP) on the membrane surface and therefore FO performance. This paper shows that FO draw channel occlusion is expected to have a significant impact on fluid hydrodynamics when the membrane is not appropriately supported in the draw side.

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Section: Introductionmentioning

confidence: 99%

Impact of FO Operating Pressure and Membrane Tensile Strength on Draw-Channel Geometry and Resulting Hydrodynamics

et al. 2020

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“…Such as by Blazheska [12], it has been recognized rarely that elevated feed pressures and/or temperatures not only engender compaction of the different membrane material layers, but also an intrusion of the membrane into the permeate spacer during the operation of SWEs. A detailed literature review shows that several other authors express serious suspicions that the permeate-sided pressure drop (influenced by membrane intrusion) may substantially impact the effective driving pressure and therefore the element performance [13,17]. In their study, de Rover et al [16] also explicitly state the hypothesis that this effect, among membrane compaction, must influence the element performance adversely.…”

Section: Specific Performance-limiting Effectsmentioning

confidence: 99%

High‐Pressure Reverse Osmosis for Industrial Water Recycling: Permeate‐Sided Pressure Drop as Performance‐Limiting Factor

Kleffner

Braun

Antonyuk

2021

Chemie Ingenieur Technik

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In the chemical industry large amounts of saline wastewater occur. Its disposal into rivers is a considerable burden to the ecosystem. To strive for a circular economy and enable a viable raw material recycling, energy-efficient concentration processes are requisite. High-pressure reverse osmosis meets this criterion, but its industrial application demands suitable membrane elements that withstand the exceptional operation conditions and provide sufficient performance. Hence, new requirements regarding the design of spiral-wound elements arise. To identify those, specific performance-limiting effects need a better understanding.

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“…24,[31][32][33][34] Only a few studies have been conducted on the HPRO process. Kleffner et al 35 investigated the impact of membrane intrusion on permeate-sided pressure drop in the HPRO. In another study, Kleffner et al 36 investigated a 10.16-cm HPRO element at its highest feed pressure of 120 bar for 800 h at 30 C. To date, however, no HPRO process simulation and analysis has been developed in which the feed solution is hyper-saline (brine) (>70 g/L TDS).…”

Section: Introductionmentioning

confidence: 99%

“…Only a few studies have been conducted on the HPRO process. Kleffner et al 35 investigated the impact of membrane intrusion on permeate‐sided pressure drop in the HPRO. In another study, Kleffner et al 36 investigated a 10.16‐cm HPRO element at its highest feed pressure of 120 bar for 800 h at 30°C.…”

Section: Introductionmentioning

confidence: 99%

Process simulation and analysis of high‐pressure reverse osmosis (HPRO) in the treatment and utilization of desalination brine (saline wastewater)

Panagopoulos

2022

Intl J of Energy Research

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Reverse osmosis (RO) is nowadays considered to be the most dominant desalination technology. Nonetheless, due to osmotic pressure constraints, conventional RO cannot desalinate brine effluents (>70 g/L of total dissolved solids [TDS]). Thus, high-pressure RO (HPRO), that is, RO operating at a pressure of more than 82 bar, has recently attracted the interest of the water and wastewater industry. To this aim, a process simulation for the HPRO process was implemented and several sensitivity analyses were conducted for the first time. The results showed that by increasing the recovery rate by 0.05, energy consumption decreased by 3.5%. An increase in the feed brine temperature from 5 C to 30 C increases the permeate flow rate (up to 0.929 m 3 /h), the permeate

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Influence of Membrane Intrusion on Permeate‐Sided Pressure Drop During High‐Pressure Reverse Osmosis

Cited by 16 publications

References 44 publications

Impact of FO Operating Pressure and Membrane Tensile Strength on Draw-Channel Geometry and Resulting Hydrodynamics

Impact of FO Operating Pressure and Membrane Tensile Strength on Draw-Channel Geometry and Resulting Hydrodynamics

High‐Pressure Reverse Osmosis for Industrial Water Recycling: Permeate‐Sided Pressure Drop as Performance‐Limiting Factor

Process simulation and analysis of high‐pressure reverse osmosis (HPRO) in the treatment and utilization of desalination brine (saline wastewater)

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