Experimental and simulation studies of two types of 5-inch scale hollow fiber membrane modules for pressure-retarded osmosis

Tanaka, Yasuhiko; Yasukawa, Masahiro; Goda, Shohei; Sakurai, Hidehiko; Shibuya, Masatoyo; Takahashi, Tomoki; Kishimoto, Michimasa; Higa, Mitsuru; Matsuyama, Hideto

doi:10.1016/j.desal.2018.09.015

Cited by 37 publications

(39 citation statements)

References 36 publications

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“…As an example, a comparison by Altaee et al [140] showed 6% deviation of the model and the experimental data from [58]. In PRO modules, the model has been validated for both spiral wound [141] and hollow fiber membrane modules [142,95]. The model, accepted to be valid, has also been used in experimental studies to find the structural parameter in spiral wound membrane modules [143].…”

Section: Mass Transfer In the Draw Sidementioning

confidence: 99%

Modeling and simulation of the dual stage pressure retarded osmosis systems

Soltani

Struchtrup

2019

Desalination

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Utilization of renewable energy sources, as an approach to reduce greenhouse gas (GHG) emissions, have been globally popular in the last few decades. Among renewable energy sources, pressure retarded osmosis (PRO) has been scrutinized by scientists since the mid 70's. However, even today, the existing river-sea PRO systems can only marginally meet the generally approved criterion of 5 W/m 2 power density, a threshold for an economically feasible PRO system. As an approach to increase the performance of PRO systems, multi-staging of PRO modules are investigated. A mathematical model of the scaled up PRO process is proposed with consideration for internal and external concentration polarization, reverse salt flux, and spatial variations along the membrane. A thermodynamic model is also developed with consideration for entropy generation and losses in the process. It predicts the percentile of each work loss source compared to the net work in the system. Several configurations of dual stage PRO system are presented and compared to single stage PRO. The comparison is based on three proposed target functions of power density (PD), specific energy (SE), and work per drawn freshwater (W drawn). Applied hydraulic pressures and flow rates of draw and feed solutions are optimized for maximizing the target functions. The results indicate that overall performance of the system could be improved by up to 8 % with a dual stage PRO in the case of SE. The system iv performance is not improved by depressurizing the draw solution before the second module in cases of SE and W drawn. The thermodynamic analysis demonstrate the contribution of each work loss and justify the reason of diminishing the net work over the losses. The effect of membrane area and membrane characteristics on the SE target function is also investigated. The distribution of membrane area in each module depends on the selected configuration and inlet draw solution. In the dual stage systems, the SE value increases up to 14% by improving the membrane characteristics. Reducing the salt rejection coefficient (B) is the most effective membrane characteristic in our configurations. Replacing seawater with RO brine in draw solution results in a significant improvement in SE values.

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Section: Mass Transfer In the Draw Sidementioning

confidence: 99%

Modeling and simulation of the dual stage pressure retarded osmosis systems

Soltani

Struchtrup

2019

Desalination

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“…Data based on experiments done previously in a pilot plant research were used for validation of the computer model [6]. A full-scale hollow fibre PRO module (Toyobo, Japan) was used in the PRO unit for energy generation.…”

Section: Model Validationmentioning

confidence: 99%

“…A full-scale hollow fibre PRO module (Toyobo, Japan) was used in the PRO unit for energy generation. The membrane is 682 mm long and comes with a 70.5 m 2 membrane active area and 0.27 L/m 2 h and 0.035 L/m 2 h.bar permeability coefficients of water and salt, respectively [6]. The flow rates and concentrations of DS and FS were 720 and 480 L/h and 1M NaCl and DI water, respectively.…”

Section: Model Validationmentioning

confidence: 99%

“…K is the ratio of S to the coefficient of salt diffusion (D) of NaCl, i.e., K = S/D. The structure variable (S) of the hollow fibre membrane is 1024 µm and D for 1M NaCl is 1.3 × 10 −9 m 2 /s, and the K value is 219 h/m [6]. Water and solute permeabilities of the hollow fibre PRO membrane are 0.27 L/m 2 h.bar and 0.035 L/m 2 h, respectively.…”

Section: Model Validationmentioning

confidence: 99%

“…The chemical potential transforms into a hydraulic pressure when the freshwater passes across the PRO membrane. Different designs and hybrid systems were suggested to increase the energy output in the PRO process [4][5][6]. Selecting a proper salinity gradient is critical for a successful PRO process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Thermal Desalination Brine Reject-Sewage Effluent Salinity Gradient for Power Generation and Dilution of Brine Reject

Altaee

AlZainati

2020

Energies

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Salinity gradient resource presents an essential role for power generated in the process of pressure-retarded osmosis (PRO). Researchers proposed several designs for coupling the PRO process with the desalination plants, particularly reverse osmosis technology for low-cost desalination but there is no study available yet on the utilization of the concentrated brine reject from a thermal desalination plant. This study evaluates the feasibility of power generation in the PRO process using thermal plant brine reject-tertiary sewage effluent (TSE) salinity gradient resource. Power generation in the PRO process was determined for several commercially available FO membranes. Water flux in Oasys Forward Osmosis membrane was more than 31 L/m2h while the average water flux in the Oasys module was 17 L/m2h. The specific power generation was higher in the thin film composite (TFC) membranes compared to the cellulose triacetate (CTA) membranes. The specific power generation for the Oasys membrane was 0.194 kWh/m3, which is 41% of the maximum Gibbs energy of the brine reject-TSE salinity gradient. However, the Hydration Technology Innovation CTA membrane extracted only 0.133 kWh/m3 or 28% of Gibbs free energy of mixing for brine reject-TSE salinity gradient. The study reveals the potential of the brine reject-TSE salinity gradient resource for power generation and the dilution of brine reject.

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Mathematical Modeling of Fluid Flow Through a Hollow Fiber Water System Using Porous Medium Model

Khanafer

Assad

2021

Arab J Sci Eng

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Experimental and simulation studies of two types of 5-inch scale hollow fiber membrane modules for pressure-retarded osmosis

Cited by 37 publications

References 36 publications

Modeling and simulation of the dual stage pressure retarded osmosis systems

Modeling and simulation of the dual stage pressure retarded osmosis systems

Novel Thermal Desalination Brine Reject-Sewage Effluent Salinity Gradient for Power Generation and Dilution of Brine Reject

Mathematical Modeling of Fluid Flow Through a Hollow Fiber Water System Using Porous Medium Model

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