Prediction of mass-transfer coefficient with suction in the applications of reverse osmosis and ultrafiltration

1997 ◽  
Vol 128 (2) ◽  
pp. 119-131 ◽  
Author(s):  
S. De ◽  
P.K. Bhattacharya
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Reverse Osmosis

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.

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

Absorption of oxygen into solutions of polymers

1986 ◽  
Vol 51 (10) ◽  
pp. 2127-2134 ◽  
Author(s):  
František Potůček ◽  
Jiří Stejskal
Keyword(s):  
Mass Transfer ◽  
Aqueous Solutions ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Flow Rate ◽  
Liquid Flow ◽  
Flow Curve ◽  
Liquid Flow Rate ◽  
Polymer Concentration ◽  
Newtonian Liquids

Absorption of oxygen into water and aqueous solutions of poly(acrylamides) was studied in an absorber with a wetted sphere. The effects of changes in the liquid flow rate and the polymer concentration on the liquid side mass transfer coefficient were examined. The results are expressed by correlations between dimensionless criteria modified for non-Newtonian liquids whose flow curve can be described by the Ostwald-de Waele model.

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