Mathematical modeling and numerical simulation of ammonia removal from wastewaters using membrane contactors

Nosratinia, Ferial; Ghadiri, Mahdi; Ghahremani, Hazhir

doi:10.1016/j.jiec.2013.10.065

Cited by 29 publications

(11 citation statements)

References 21 publications

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“…The computational fluid dynamics (CFD) approach was used recently to model mass transfer and hydrodynamics of liquid‐vapor/gas or liquid‐liquid separation in microdevices. The CFD results have revealed excellent agreement between the measured data and model findings , .…”

Section: Introductionmentioning

confidence: 52%

Numerical Simulation of Acetone Stripping from Water in a Microchannel Device

2019

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A 2D mathematical model was developed in this study to simulate acetone separation from water by using a microstripper device. Model validation was implemented through a comparison of simulation results of acetone removal from water and experimental data for dry nitrogen over a wide range of carrier gas and liquid velocities. A comparison of experimental data and simulation results illustrated reasonable agreement. The results indicate that increasing the liquid velocity reduces the acetone removal rate because increasing liquid velocity results in a decrease in the residence time of liquid in the liquid channel, whereas there is an enhancement in acetone removal with increasing carrier gas velocity. A sharp decrease in acetone concentration in the liquid channel was observed.

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Section: Introductionmentioning

confidence: 52%

Numerical Simulation of Acetone Stripping from Water in a Microchannel Device

2019

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“…Therefore, hollow fiber membrane can be divided into predefined number of states, whereby mass balance can be performed independently. All hollow fibers within the membrane are similar . In other words, specification of the hollow fibers, such as inner and outer diameter as well as thickness, is uniform. The shell side pressure variations are negligible, while permeate pressure build‐up can be described using Hagen–Poiseuille equation Ideal behavior of gas mixture on both sides of the membrane attributed to low operating pressure close to ambient condition …”

Section: Methodsmentioning

confidence: 99%

“…iii. The shell side pressure variations are negligible, 84,[91][92][93][94] while permeate pressure build-up can be described using Hagen-Poiseuille equation. 11,27,84,90,94,95 iv.…”

Section: Succession Of States For Separation Mechanism Of Hollow Fibementioning

confidence: 99%

Process simulation and optimization of oxygen enriched combustion using thin polymeric membranes: effect of thickness and temperature dependent physical aging

Lock

Lau

Shariff

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Limited work has been available to model thickness and temperature dependent physical aging encountered in polymeric membranes for gas separation to provide physically intuitive interpretation underlying the process. The Tait equation of states has been integrated within conventional dual mode mathematical model to characterize the physical aging mechanism, whereby the model requires merely temperature dependent parameters. Subsequently, the Tait‐dual mode mechanism model has been incorporated within a succession of states methodology that quantifies transport mechanism in a countercurrent hollow fiber membrane. Finally, the developed mathematical model has been implemented in Aspen HYSYS to constitute an oxygen enrichment plant. RESULTS The simulation model has been validated with experimental observation with an acceptable error of < 6.5%. The process simulation tool has been used to evaluate the separation performance of oxygen enrichment plant using polymeric membrane with consideration of operating temperature (35–55 °C) and thickness dependent (400–1000 nm) physical aging. It is found that the optimal membrane design that generates highest profitability with physical aging consideration is at film thickness of ∼400 nm and operating temperature of 55 °C. Under such operating condition, the deviation between ideal and non‐ideal simulation model is also the smallest at ∼6%, which implies that physical aging has the least impact to the operability of the plant. CONCLUSION The developed simulation model has the potential to be applied for complex membrane system design (multiple membranes or hybrid system), scale up and optimization study that is essentially required for industrial scale application. © 2019 Society of Chemical Industry

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“…Mandowara and Bhattacharya developed a 2D mathematical model for polypropylene (PP) membrane contactors incorporating the effect of pore diffusion and mass transfer resistance and Agrahari et al developed a model taking into account the molecular and Knudsen diffusion effects as well as the rates of adsorption and desorption of ammonia molecules to and from the walls of the pores during transport through the membrane. More recently, Rezakazemi et al used COMSOL Multiphysics to solve a 2D diffusion model to predict the unsteady state of ammonia transport, and Nosratinia et al to describe the concentration profile inside the membrane.…”

Section: Theorymentioning

confidence: 99%

“…The mechanism of removal of ammonium using hollow fiber membrane contactors (HFMC) has been the subject of many studies . The cited studies were devoted to enhancing ammonium extraction efficiency by optimizing the operating conditions to achieve high recovery ratios.…”

Section: Introductionmentioning

confidence: 99%

Trace ammonium removal by liquid–liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent

Bernal

Alcaraz

Casas

et al. 2016

J of Chemical Tech & Biotech

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© 2016 Society of Chemical Industry. BACKGROUND: This work evaluates hollow fiber liquid-liquid membrane contactors (HFMC) as a polishing step for the removal of low levels of ammonium from water purified by (or being supplied to) a membrane distillation unit in order to fulfil the conductivity requirements of hydrogen production by water electrolysis. RESULTS: The influence of the operating conditions (flow, pH, ammonium concentration, buffer capacity) were evaluated under a closed-loop setup in order to achieve a reduction of total ammonia concentration in water, from 15 to 1mgL-1 to assure the production of water in the membrane distillation with a conductivity lower than 1 µS cm-1. These values were used to validate a numerical algorithm describing the system performance. In order to reach the ammonia concentration requirements and considering the low concentration of bicarbonate (low pH buffer capacity) in the treated water a buffer agent was added to the working solution. CONCLUSIONS: HFMC technology is a suitable solution to remove low levels of ammonium from water to values as low as 1mgL- 1NH3 through appropriate control of pH. The ammonium removal efficiency of the HFMC was improved by raising the pH or the flow rate. Finally, the model proposed provides a good description of the membrane contactor performance with minimal deviations when compared with experimental results.Peer ReviewedPostprint (published version

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Mathematical modeling and numerical simulation of ammonia removal from wastewaters using membrane contactors

Cited by 29 publications

References 21 publications

Numerical Simulation of Acetone Stripping from Water in a Microchannel Device

Numerical Simulation of Acetone Stripping from Water in a Microchannel Device

Process simulation and optimization of oxygen enriched combustion using thin polymeric membranes: effect of thickness and temperature dependent physical aging

Trace ammonium removal by liquid–liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent

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