Optimization of energy consumption in the 3300 m3/d RO Kerkennah plant

Fethi, Kamel

doi:10.1016/s0011-9164(03)00394-1

Cited by 21 publications

(13 citation statements)

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“…By constraining the effluent concentration in all simulations to the drinking water total dissolved solids standard (500 mg L –1 ), these findings enable a comparison of CDI architecture specific thermodynamic efficiency and volumetric energy consumption to that of RO. When energy recovery was included, mean thermodynamic efficiency (η T* ) for MCDI ranged from 10% to 20% (maximum of 62% under optimal conditions, Table S3), which is greater than the reported range for pilot and full-scale brackish water RO systems (1–16% thermodynamic efficiency assuming dilute concentration of 15 mg L –1 NaCl), ,− A recent study by Qin et al, in which MCDI was simulated for comparison with RO using a highly simplistic Randle’s circuit, estimated MCDI thermodynamic efficiency between 5% and 10% when comparably operated due to an assumed energy recovery of 33%. Alternatively, the mean simulated round-trip efficiency in this study projects that 54–58% of energy consumed during charging, across all electrode thicknesses and influent concentrations, would be available for recovery in MCDI (Figure and Table S3).…”

Section: Resultsmentioning

confidence: 83%

Global Sensitivity Analysis To Characterize Operational Limits and Prioritize Performance Goals of Capacitive Deionization Technologies

Hand

Shang

Guest

et al. 2019

Environ. Sci. Technol.

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Capacitive deionization (CDI) technologies couple electronic and ionic charge storage, enabling improved thermodynamic efficiency of brackish desalination by recovering energy released during discharge. However, insight into CDI has been limited by discrete experimental observations at low desalination depths (Δc, typically reducing influent salinity by 10 mM or less). In this study, the performance and sensitivity of three common CDI configurations [standard CDI, membrane CDI (MCDI), and flowable electrode CDI (FCDI)] were evaluated across the operational and material design landscape by varying eight common input parameters (electrode thickness, influent concentration, current density, electrode flow rate, specific capacitance, contact resistance, porosity, and fixed charge). All combinations of designs were evaluated for two influent concentrations with a calibrated and validated one-dimensional (1-D) porous electrode model. Sensitivity analyses were carried out via Monte Carlo and Morris methods, focusing on six performance metrics. Across all performance metrics, high sensitivity was observed to input parameters which impact cycle length (current, resistance, and capacitance). Simulations demonstrated the importance of maintaining both charge and round-trip efficiencies, which limit the performance of CDI and FCDI, respectively. Accounting for energy recovery, only MCDI was capable of operating at thermodynamic efficiencies similar to reverse osmosis.

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Section: Resultsmentioning

confidence: 83%

Global Sensitivity Analysis To Characterize Operational Limits and Prioritize Performance Goals of Capacitive Deionization Technologies

Hand

Shang

Guest

et al. 2019

Environ. Sci. Technol.

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“…A general industrial RO process is composed of intaking raw water, a pretreatment step, the RO system, a posttreatment step, and water supply pumping [5,10,[22][23][24][25][26][27][28][29]. The pretreatment step includes sieves, chlorination, coagulation, flocculation, sedimentation, multimedia filtration, cartridge filtration, de-chlorination, and adding acid or anti-scalant [23].…”

Section: Introductionmentioning

confidence: 99%

“…The RO system is composed of a highpressure pump, RO modules, and an energy recovery device (ERD) [23]. The post-treatment step includes degassing, remineralization, neutralization and disinfection [5,10,[22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

How RO membrane permeability and other performance factors affect process cost and energy use: A review

2019

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Reverse osmosis (RO) technology has progressed steadily over the last few decades. Those gains were achieved through improvements in both RO membrane element performance and energy recovery technologies. However, some recent literature indicates that RO membrane water permeability is approaching performance limits imposed by transport processes and thermodynamic constraints. This paper reviews how RO membrane element performance affects the cost of RO processes, especially the specific energy consumption. RO membrane performance encompasses water permeability, salt permeability, and other some characteristics of the RO element. This paper considers not only conventional RO processes, but also the recently proposed closed-circuit RO and batch RO processes. Even if the membrane water permeability increases, little additional effect is found when the membrane water permeability exceeds around 3 LMH/bar for seawater RO and 8 LMH/bar for brackish water RO in conventional single-stage RO. Increasing membrane water permeability has the potential to decrease membrane surface area and associated costs. A major limitation of most existing literature is that performance is evaluation on in terms of the initial operating conditions. Chronological changes, such as result from fouling, must also be considered to accurately validate how membrane element performance affects RO cost.

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“…Published research on SWRO has investigated reducing the SEC by optimising the membrane module [2,[5][6][7][8][9][10][11][12][13] and/or using more permeable membranes [8,[14][15][16]. However, these studies have utilised modelling tools [1,2] without process simulation tools.…”

Section: Introductionmentioning

confidence: 99%

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

2016

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Optimization of energy consumption in the 3300 m3/d RO Kerkennah plant

Cited by 21 publications

References 0 publications

Global Sensitivity Analysis To Characterize Operational Limits and Prioritize Performance Goals of Capacitive Deionization Technologies

Global Sensitivity Analysis To Characterize Operational Limits and Prioritize Performance Goals of Capacitive Deionization Technologies

How RO membrane permeability and other performance factors affect process cost and energy use: A review

Energy consumption for desalination — A comparison of forward osmosis with reverse osmosis, and the potential for perfect membranes

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