Hollow fiber type PRO module and its characteristics

Kumano, Atsuo; Marui, Katsushige; Terashima, Yasuki

doi:10.1016/j.desal.2016.01.001

Cited by 25 publications

(18 citation statements)

References 5 publications

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“…Compared to the spiral-wound RO membrane element, CTA-HF membranes has lower water permeability than the spiral-wound (polyamide-based) membrane. However, the CTA-HF membrane element has about 7–10 times larger surface area than that of spiral-wound element, and so the total module performance can be competitive [ 28 , 29 ]. In this case, a lower membrane flux of the CTA membrane has beneficial advantages in terms of a lower membrane fouling risk and less concentration polarization than those in the spiral-wound cases as shown in Figure 4 [ 28 ].…”

Section: Features Of Cta-hf Ro Modulementioning

confidence: 99%

“…Cellulose triacetate (CTA)-based hollow fiber (HF) membrane is therefore one of the commercially successful semipermeable membranes that has a long historical development due to its reliable excellent performances especially for drinking water production from seawater. In addition, recently, because of the versatile demands in energy consumption and environmental concerns about brine discharge as mentioned above, CTA-based HFs have caught attention for the usage of different methods, such as forward osmosis (FO) [ 23 , 24 , 25 , 26 ], pressure-retarded osmosis (PRO) [ 11 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ] and brine concentration (BC) [ 34 , 35 ] for the emerging technologies. Because their applications require optimum characteristics individually, different strategies for designing the membrane and module are required in spite of using the same CTA material.…”

Section: Introductionmentioning

confidence: 99%

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Cellulose Triacetate (CTA) Hollow-Fiber (HF) Membranes for Sustainable Seawater Desalination: A Review

et al. 2021

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Cellulose triacetate (CTA)-based hollow fiber (HF) membrane is one of the commercially successful semipermeable membranes that has had a long progress since the time the excellent semi-permeable feature of cellulose-based polymers was found in 1957. Because of the reliable and excellent performances, especially for drinking water production from seawater, CTA-HFs have been widely used as reverse osmosis (RO) membranes, especially in arid regions. In this review, recent developments and research trends on CTA-HF membranes for seawater reverse osmosis (SWRO) plants were presented. A flux analytical model, an optimization strategy for chlorine injection without losing salt rejection performance, and a module of current high performance CTA RO membranes along with its plant operation data were updated in this paper. Furthermore, a newly developed CTA-HF membrane for brine concentration (BC) application (called BC membrane) was also addressed. Finally, RO/BC hybrid operation was introduced as an effective SWRO desalination technique that enables minimizing the volume of brine disposal from the RO plant by increasing the recovery ratio and the subsequent amount of produced freshwater, without an additional energy input.

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Section: Features Of Cta-hf Ro Modulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cellulose Triacetate (CTA) Hollow-Fiber (HF) Membranes for Sustainable Seawater Desalination: A Review

et al. 2021

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“…These membranes showed superior FO water flux compared to commercial RO membranes, and they have been widely used in OM study. CTA hollow fiber FO and PRO membranes have been developed by Toyobo (Osaka, Japan) [ 25 , 26 ]. Commercial thin film composite (TFC) FO membranes were also provided by a few companies, including HTI [ 27 ], Oasys Water (Boston, MA, USA) [ 28 ], Toray Chemical Korea (Seoul, Korea) [ 29 ], Woongjin Chemical (Seoul, Korea) [ 30 ], Porifera Inc. (San Leandro, CA, USA) [ 31 ], Aquaporin (Kongens Lyngby, Denmark) [ 32 , 33 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Influence of Membrane Permeability and Structure on Osmotically-Driven Membrane Processes

2021

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The success of osmotically-driven membrane (OM) technology relies critically on high-performance membranes. Yet trade-off of membrane properties, often further complicated by the strongly non-linear dependence of OM performance on them, imposes important constraint on membrane performance. This work systematically characterized four typical commercial osmotic membranes in terms of intrinsic separation parameters, structure and surface properties. The osmotic separation performance and membrane scaling behavior of these membranes were evaluated to elucidate the interrelationship of these properties. Experimental results revealed that membranes with smaller structural parameter (S) and higher water/solute selectivity underwent lower internal concentration polarization (ICP) and exhibited higher forward osmosis (FO) efficiency (i.e., higher ratio of experimental water flux over theoretical water flux). Under the condition with low ICP, membrane water permeability (A) had dominant effect on water flux. In this case, the investigated thin film composite membrane (TFC, A = 2.56 L/(m2 h bar), S = 1.14 mm) achieved a water flux up to 82% higher than that of the asymmetric cellulose triacetate membrane (CTA-W(P), A = 1.06 L/(m2 h bar), S = 0.73 mm). In contrast, water flux became less dependent on the A value but was affected more by membrane structure under the condition with severe ICP, and the membrane exhibited lower FO efficiency. The ratio of water flux (Jv TFC/Jv CTA-W(P)) decreased to 0.55 when 0.5 M NaCl feed solution and 2 M NaCl draw solution were used. A framework was proposed to evaluate the governing factors under different conditions and to provide insights into the membrane optimization for targeted OM applications.

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“…To move the PRO technology closer to commercialization, many advanced PRO membranes have bene developed in recent years [7,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], significant progresses have also been made to understand PRO from three aspects; namely, (1) the thermodynamics of mixing between the draw and feed solutions, (2) the mass transfer across PRO membranes, and (3) the simulation of PRO modules [7-13, 17, 26-34]. Lin et al studied the thermodynamic limits of extractable energy from PRO [26].…”

Section: Introductionmentioning

confidence: 99%

Osmotic power generation by inner selective hollow fiber membranes: An investigation of thermodynamics, mass transfer, and module scale modelling

Xiong

Cai

Chong

et al. 2017

Journal of Membrane Science

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A comprehensive analysis of fluid motion, mass transport, thermodynamics and power generation during pressure retarded osmotic (PRO) processes was conducted. This work aims to (1) elucidate the fundamental relationship among various membrane properties and operation parameters and (2) analyse their individual and combined impacts on PRO module performance. A state-of-the-art inner-selective thin-film composite (TFC) hollow fiber membrane was employed in the modelling. The analyses of mass transfer and Gibbs free energy of mixing indicate that the asymmetric nature of hollow fibers results in more significant external concentration polarization (ECP) in the lumen side of the inner-selective hollow fiber membranes. In addition, a trade-off relationship exists between the power density (PD) and the specific energy (SE). The PD vs. SE trade-off upper bound may provide a useful guidance whether the flowrates of the feed and draw solutions should be further optimized in order to (1) minimize the boundary thickness and (2) maximize the osmotic power generation. Two new terms, mass transfer efficiency and power harvesting efficiency 2 for osmotic power generation, have been proposed. This work may provide useful insights to design and operate PRO modules with enhanced performance so that the PRO process becomes more promising in real applications in the near future.

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Hollow fiber type PRO module and its characteristics

Cited by 25 publications

References 5 publications

Cellulose Triacetate (CTA) Hollow-Fiber (HF) Membranes for Sustainable Seawater Desalination: A Review

Cellulose Triacetate (CTA) Hollow-Fiber (HF) Membranes for Sustainable Seawater Desalination: A Review

Insights into the Influence of Membrane Permeability and Structure on Osmotically-Driven Membrane Processes

Osmotic power generation by inner selective hollow fiber membranes: An investigation of thermodynamics, mass transfer, and module scale modelling

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