Effect of feed temperature on permeate flux and mass transfer coefficient in spiral-wound reverse osmosis systems

Desalination ◽  
2002 ◽  
Vol 144 (1-3) ◽  
pp. 367-372 ◽  
Author(s):  
Mattheus F.A. Goosen ◽  
Shyam S. Sablani ◽  
Salha S. Al-Maskari ◽  
Rashid H. Al-Belushi ◽  
Mark Wilf
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Reverse Osmosis ◽  
Permeate Flux ◽  
Feed Temperature ◽  
Spiral Wound

scholarly journals The Correction of the Dimensionless Equation for the Mass Transfer Coefficient Estimation during the Membrane Modules Regeneration

2020 ◽  
Vol 7 (2) ◽  
pp. F24-F29
Author(s):  
S.V. Huliienko ◽  
Y.M. Korniienko ◽  
M.S. Metlina ◽  
I.Y. Tereshenko ◽  
V.S. Kaminskyi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Membrane Separation ◽  
Permeate Flux ◽  
Dimensionless Equation ◽  
Number Variation ◽  
Process Operation ◽  
Membrane Modules ◽  
Spiral Wound

The cleaning or regeneration of fouled membrane modules is an essential procedure in the membrane equipment operation. Despite the development of some successful cleaning techniques, the predictions of the membrane separation process operation parameters after regeneration is still an unsolved problem. In our previous works, the attempt to develop the methodology of estimating the membrane productivity after the regeneration of the fouled spiral wound membrane modules by cleaning the subatmospheric pressure has been made. However, this methodology requires some improvement, including the correction of the dimensionless equation to calculate the mass transfer coefficient. In this work, a set of additional experiments was carried out, and the corrections of the mass transfer correlation were done using both new and previously obtained experimental data. As a result, the improved dimensionless equation was contained as Sh = 0.00045Re0.8Sc0.33(de/l). This equation is valid in the range of Reynolds number variation of 0.4–60.0 for the case of the regeneration of spiral wound modules and can be used for the prediction of the permeate flux after the regeneration procedure.

Application of ScaleGuard® at reverse osmosis and nanofiltration installations

2003 ◽  
Vol 3 (5-6) ◽  
pp. 133-138 ◽  
Author(s):  
S.G.J. Heijman ◽  
H. Folmer ◽  
F. Donker ◽  
B.M. Rietman ◽  
J.C. Schippers
Keyword(s):  
Mass Transfer ◽  
Surface Water ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Reverse Osmosis ◽  
Early Stage ◽  
Inorganic Compounds ◽  
Full Scale ◽  
Reverse Osmosis Plant ◽  
On Line

ScaleGuard® is a continuous on-line monitor that detects scaling at an early stage when fed with the concentrate of a pilot- or full-scale plant. Scaling is observed in the ScaleGuard before it occurs in the full-scale installation. The ScaleGuard is used to optimize the recovery of two full-scale plants: one reverse osmosis plant treating pretreated surface water and one nanofiltration plant treating anaerobic groundwater. Based on the results of the ScaleGuard the conversion of both the reverse osmosis plant and the nanofiltration plant has been increased from 80% to 82%. The interpretation of the results of the ScaleGuard which was connected with the reverse osmosis plant was not unambiguous. This was due to the mass transfer coefficient decline in the ScaleGuard which could not be attributed to scaling. Results in the nanofiltration plant did not give room for any doubt. In addition, safe supersaturation ratios were derived from experience in pilot- and full-scale plants using anti-scalants for seven sparingly soluble inorganic compounds.

scholarly journals Analysis of Concentration Polarisation in Full-Size Spiral Wound Reverse Osmosis Membranes using Computational Fluid Dynamics

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 353
Author(s):  
Wenshu Wei ◽  
Xiang Zou ◽  
Xinxiang Ji ◽  
Rulin Zhou ◽  
Kangkang Zhao ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Reverse Osmosis ◽  
Membrane Filtration ◽  
Fluid Velocity ◽  
Full Scale ◽  
Permeate Flux ◽  
Three Dimensional Model ◽  
Cfd Modelling ◽  
Concentration Polarisation ◽  
Spiral Wound

A three-dimensional model for the simulation of concentration polarisation in a full-scale spiral wound reverse osmosis (RO) membrane element was developed. The model considered the coupled effect of complex spacer geometry, pressure drop and membrane filtration. The simulated results showed that, at a salt concentration of 10,000 mg/L and feed pressure of 10.91 bar, permeate flux decreased from 27.6 L/(m2 h) (LMH) at the module inlet to 24.1 LMH at the module outlet as a result of salt accumulation in the absence of a feed spacer. In contrast, the presence of the spacer increased pressure loss along the membranes, and its presence created vortices and enhanced fluid velocity at the boundary layer and led to a minor decrease in flux to 26.5 LMH at the outlet. This paper underpins the importance of the feed spacer’s role in mitigating concentration polarisation in full-scale spiral wound modules. The model can be used by both the industry and by academia for improved understanding and accurate presentation of mass transfer phenomena of full-scale RO modules by different commercial manufacturers that cannot be achieved by experimental characterization of the mass transfer coefficient or by CFD modelling of simplified 2D flow channels.

Interactions Between Natural Organic Matter (NOM) and Membranes: Rejection and Fouling

1999 ◽  
Vol 40 (9) ◽  
pp. 131-139 ◽  
Author(s):  
Gary Amy ◽  
Jaeweon Cho
Keyword(s):  
Mass Transfer ◽  
Molecular Weight ◽  
Organic Matter ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Natural Organic Matter ◽  
Operating Conditions ◽  
Membrane Properties ◽  
Permeate Flux ◽  
Molecular Weight Cutoff

This work demonstrates that interactions between membranes and natural organic matter (NOM) include rejection by both steric and electrostatic exclusion, and fouling by adsorption. NOM rejection and fouling are influenced by both NOM characteristics (molecular weight, aromaticity/humic content, and charge) and membrane properties (molecular weight cutoff (MWCO), hydrophobicity, and charge) as well as hydrodynamic operating conditions represented by a f/k ratio (the ratio of permeate flux (f) to a diffusional back-transport mass transfer coefficient (k)).

Determination of mass transport characteristics for natural organic matter (NOM) in ultrafiltration (UF) and nanofiltration (NF) membranes

2002 ◽  
Vol 2 (2) ◽  
pp. 151-160 ◽  
Author(s):  
S. Lee ◽  
Y. Shim ◽  
In S. Kim ◽  
J. Sohn ◽  
S.K. Yim ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Organic Matter ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Natural Organic Matter ◽  
Membrane Surface ◽  
Operating Conditions ◽  
Permeate Flux ◽  
Solute Permeability ◽  
Cross Flow Filtration

This study is mainly concerned with establishing a reliable method of the quantitative analysis of natural organic matter (NOM) transport characteristics through ultrafiltration (UF) and nanofiltration (NF) membranes with molecular weight cutoffs of 8000 (GM) and 250 (ESNA), respectively. Filtrations were conducted with a cross-flow filtration unit and hydrodynamic operating conditions were controlled by a J0/k ratio (the ratio of initial permeate flux [J0] to a back diffusional mass transfer coefficient [k]). A four-parameter (the apparent mass transfer coefficient [ka], the solute concentration near the membrane surface [Cm], the solute permeability [Pm], and the reflection coefficient (σ) model based on concentration polarization and irreversible thermodynamics was used to manipulate experimental results quantitatively. With the values of the determined parameters, the transport characteristics of NOM due to different solution chemistries such as pH and ionic strength through UF/NF membrane pores were investigated. This model was also used to demonstrate the effects of NOM structure (hydrophobic/transphilic/hydrophilic) on transport through the membranes, with XAD-8/4 resins fractionation and isolation procedures. Four parameters estimated through the model were revealed to be relevant to elucidate the behaviors of NOM in membranes and corresponding transport-related results were in good agreement with the theoretical descriptions related to the interactions between NOM molecules and membrane surface/pores.

Theoretical Study of CO2 Absorption into Novel Reactive 1DMA2P Solvent in Split-flow Absorber-stripper Unit: Mass Transfer Performance and Kinetic Analysis

2019 ◽  
Vol 17 (12) ◽  
Author(s):  
Majid Saidi
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Co2 Absorption ◽  
Transfer Performance ◽  
Amine Concentration ◽  
Liquid Feed ◽  
Split Flow ◽  
Overall Mass Transfer Coefficient ◽  
Feed Temperature

Abstract In the present study, the mass transfer performance of CO2 absorption into 1-dimethylamino-2-propanol (1DMA2P) as a novel amino alcohol solvent has been theoretically investigated in a split-flow absorber-stripper unit. The mass transfer performance has been presented in terms of CO2 absorption flux and overall mass transfer coefficient (KGav) by simultaneous considering of chemical reactions and mass transfer phenomenon. The developed comprehensive mathematical model has been validated based on related experimental data in literature. The impact of main operation parameters including liquid feed temperature, amine concentration, liquid velocity and CO2 loading were evaluated. The presented results indicated that increasing the liquid feed temperature, amine concentration and liquid flow rate improves the overall mass transfer coefficient. Also, the CO2 absorption performance of conventional and alternative amines such as monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), methyldiethanolamine (MDEA), piperazine (PZ), 4-(diethylamino)-2-butanol (DEAB) and 1DMA2P have been investigated and compared in order to provide guidelines about effective screening of solvents. The modeling results indicated that the KGav for CO2 absorption into different solution can be ranked as follows: PZ>MEA>DEA>DEAB>1DMA2P>MDEA>TEA.

Sign in / Sign up

Export Citation Format

Share Document