Steady state and dynamic modeling of spiral wound wastewater reverse osmosis process

Al‐Obaidi, Mudhar A.; Mujtaba, Iqbal M.

doi:10.1016/j.compchemeng.2016.04.001

Cited by 41 publications

(13 citation statements)

References 25 publications

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“…This in turn will reduce the quantity of water passes through the membrane and ultimately reduces the recovery rate. The same findings have been confirmed by Lee et al (2010) and Al-Obaidi and Mujtaba (2016). Consequently, the energy consumption increases as a result to an increase in the feed flow rate as can be shown in Fig.…”

Section: The Effect Of External Plant Feed Flow Ratesupporting

confidence: 87%

“…Several successful mathematical models were developed to describe the removal of phenol and phenolic compounds from wastewater using a single spiral wound RO process and focused on the impact of operating parameters on the whole performance and optimising the removal of chlorophenol using genetic algorithm (Srinivasan et al, 2009;Sundaramoorthy et al, 2011b;Srinivasan et al, 2010;Srinivasan et al, 2011;Al-Obaidi and Mujtaba, 2016;Al-Obaidi et al, 2017a;Al-Obaidi et al, 2017b;Al-Obaidi et al, 2017c). However, multi-stage RO wastewater system considering the permeate and retentate recycling scheme for the removal of phenol and phenolic compounds from wastewater has not been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of multi-stage reverse osmosis process with permeate and retentate recycling strategy for the removal of chlorophenol from wastewater

Al‐Obaidi

Kara-Zaïtri

Mujtaba

2019

Computers & Chemical Engineering

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Section: The Effect Of External Plant Feed Flow Ratesupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Performance evaluation of multi-stage reverse osmosis process with permeate and retentate recycling strategy for the removal of chlorophenol from wastewater

Al‐Obaidi

Kara-Zaïtri

Mujtaba

2019

Computers & Chemical Engineering

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“…Some studies have been led on RO processes operating under variable pressure constraints for several applications, such as photovoltaic-powered RO [17] or wastewater treatment [20]. They showed that dynamic running conditions have an impact on the salt concentration profile at the membrane wall which affects the permeation rate.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Preliminary Performance Analysis of a New Solar Thermal Reverse Osmosis Desalination Process

2019

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Reverse osmosis (RO) is a desalination technique that is commonly preferred because of its low energy consumption. In this paper, an innovative, thermally powered RO desalination process is presented. This new thermo-hydraulic process uses solar thermal energy in order to realize the pressurization of the saltwater beyond its osmotic pressure to allow its desalination. This pressurization is enabled thanks to a piston or a membrane set in motion in a reservoir by a working fluid that follows a thermodynamic cycle similar to an Organic Rankine Cycle. In this cycle, the evaporator is heated by low-grade heat, such as the one delivered by flat-plate solar collectors, while the condenser is cooled by the saltwater to be treated. Such an installation, designed for small-scale (1 to 10 m3·day−1) brackish water desalination, should enable an average daily production of 500 L of drinkable water per m² of solar collectors with a specific thermal energy consumption of about 6 kWhth·m−3. A dynamic modeling of the whole process has been developed in order to study its dynamic cyclic operating behavior under variable solar thermal power, to optimize its design, and to maximize its performances. This paper presents the preliminary performance results of such a solar-driven desalination process.

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“…Due to the complexity of the RO phenomenon, few researches have been devoted to it [3][4][5]. As a result, most researchers have focused their studies on numerical simulation [6][7][8][9][10]. Computational fluid dynamics (CFD), which is able to take into account significant variations of the fluid properties at the membrane level, is particularly suitable [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of a zero normal-concentration-gradient outflow boundary condition on concentration polarization in a CFD study of a reverse osmosis process

Hamdache

Belkacem

2018

J Braz. Soc. Mech. Sci. Eng.

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Numerically modeling only part of the reverse osmosis channel and assuming that the concentration gradient is zero at the outflow is common practice. In the present work, the effect of this hypothesis on concentration polarization and its validity are numerically investigated. The reverse osmosis system considered consists of two parallel walls. The top wall is assumed to be impermeable and a membrane is placed at the bottom wall. To investigate the hypothesis of zero concentration gradient at the outflow, two different cases are considered. In the first case, the membrane occupies the full-bottom wall, while in the second case, the membrane is followed by an impermeable wall section to ensure a steady-state concentration at the channel outlet. The finite volume method is used to solve the governing equations. In order to check the accuracy of our computational code, the simulated results for the first case without an impermeable section are validated against numerical simulations available in the literature. The simulation results show that the choice of the boundary condition at the outlet channel considered by most authors is not always obvious. This assumption leads to an under-evaluation of the membrane concentration. The deviation reaches 20% for short membrane lengths and low feed concentrations.

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Steady state and dynamic modeling of spiral wound wastewater reverse osmosis process

Cited by 41 publications

References 25 publications

Performance evaluation of multi-stage reverse osmosis process with permeate and retentate recycling strategy for the removal of chlorophenol from wastewater

Performance evaluation of multi-stage reverse osmosis process with permeate and retentate recycling strategy for the removal of chlorophenol from wastewater

Dynamic Modeling and Preliminary Performance Analysis of a New Solar Thermal Reverse Osmosis Desalination Process

Effects of a zero normal-concentration-gradient outflow boundary condition on concentration polarization in a CFD study of a reverse osmosis process

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