Effect of feed spacer induced membrane deformation on the performance of pressure retarded osmosis (PRO): Implications for PRO process operation

She, Qianhong; Hou, Dianxun; Liu, Junxian; Tan, Kang Hai; Tang, Chuyang Y.

doi:10.1016/j.memsci.2013.05.061

Cited by 185 publications

(154 citation statements)

References 44 publications

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“…In previous literatures [17,35], it was observed that the membrane deforms at a higher applied hydraulic pressure. Thus, the value of hydraulic permeability and solute permeability changes with the applied hydraulic pressure.…”

Section: P D Barmentioning

confidence: 89%

Osmotically driven membrane processes by using a spiral wound module — Modeling, experimentation and numerical parameter estimation

et al. 2015

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Section: P D Barmentioning

confidence: 89%

Osmotically driven membrane processes by using a spiral wound module — Modeling, experimentation and numerical parameter estimation

et al. 2015

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“…The calculation of pressure dependent structure parameters in this paper were based on the assumption that the water and salt permeability were independent of the applied pressure, which may appear to be somewhat contradictory to part of the literature [18,19]. Nevertheless, our assumption is based on several arguments.…”

Section: Uncertainty In Experiments and Modellingmentioning

confidence: 97%

“…Nevertheless, our assumption is based on several arguments. (1) In the presented work, the PRO experiments were performed with a tricot type feed spacer that has been found to result in the lowest variation in the modelled membrane parameters due to variations in transmembrane pressures [19], and (2) initial water permeability tests using pressures up to 10 bar were performed prior to all PRO experiments. Thus, any membrane deformation that could be expected to influence the skin properties of the membrane as a result of pressurisation should have occurred during the water permeability tests.…”

Section: Uncertainty In Experiments and Modellingmentioning

confidence: 99%

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Pressure Dependency of the Membrane Structure Parameter and Implications in Pressure Retarded Osmosis (PRO)

Holt¹,

Sivertsen²,

Thelin³

et al. 2018

Osmotically Driven Membrane Processes - Approach, Development and Current Status

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Pressure retarded osmosis (PRO) can be used to exploit the mixing energy e.g. between river water and sea water. A PRO membrane must be highly permeable for water, whereas salt ions should be retained. Furthermore, the structure parameter of the membrane support and backing structure must be low. This paper summarises an assessment of the pressure dependency of the structure parameter for flat sheet membranes, and a transport model for PRO and procedures for determination of the pressure dependency of the structure parameter are presented. The results from laboratory experiments show that that the structure parameter increases significantly with increasing trans-membrane pressure. The increase in the structure parameter was observed to depend on both characteristics of the membrane and the fresh water spacer. Using a finely textured tricot spacer reduced the pressure dependency on the structure parameter, compared to a coarser spacer. Applying a non-woven backing material between the membrane and the fresh water spacer also reduced the impact of pressure. The results show that membranes suitable for river water/sea water PRO must have a sufficiently low structure parameter and additionally resist severe deformation at relevant operating pressures.

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“…The bench-scale FO setup was essentially the same as that used elsewhere [12] except for the membrane cell which has identical channels on each side; the dimensions are a length 85mm and a cross-sectional flow area of 39 mm by 2.3 mm. These experiments used membrane coupons cut from the spiral wound modules and spacer material was also cut and placed in the channels but skims to ensure a tight fit were not used.…”

Section: Bench-scale Set Up and Experimentsmentioning

confidence: 99%

Analysis of the influence of module construction upon forward osmosis performance

et al. 2018

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. (2018) 'Analysis of the in uence of module construction upon forward osmosis performance. ', Desalination., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe potential of a commercial forward osmosis (FO) module to recover water from NEWater brine, an RO retentate, was assessed by taking an innovative approach to obtaining the mass transfer coefficients. The performance comparison of the spiral wound (S-W) FO module with that of the flat sheet laboratory unit suggests that the winding involved in S-W construction can adversely affect performance; the values for the S-W mass transfer coefficients were half of those expected. This firstof-its-kind performance comparison utilised coupons of the membrane and spacers taken from the module. The module was used both in the conventional manner for FO and in the reverse manner with the active layer facing the draw solution. Estimates of membrane parameters and mass transfer coefficients experiments for the two orientations were obtained using pure water, 10mM and 25mM NaCl solution on the feed side and 1M NaCl as draw solution. The fouling potential of NEWater brine per se was found to be low. These are the first results with a S-W module that suggest potential for this niche application; nevertheless the level of the water flux through the S-W module clearly indicates that industrial applications of S-W FO will be constrained to special cases.

show abstract

Effect of feed spacer induced membrane deformation on the performance of pressure retarded osmosis (PRO): Implications for PRO process operation

Cited by 185 publications

References 44 publications

Osmotically driven membrane processes by using a spiral wound module — Modeling, experimentation and numerical parameter estimation

Osmotically driven membrane processes by using a spiral wound module — Modeling, experimentation and numerical parameter estimation

Pressure Dependency of the Membrane Structure Parameter and Implications in Pressure Retarded Osmosis (PRO)

Analysis of the influence of module construction upon forward osmosis performance

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