Ion Exchange Selectivity as a Surrogate Indicator of Relative Permeability of Ions in Reverse Osmosis Processes

2003 ◽  
Vol 37 (7) ◽  
pp. 1432-1440 ◽  
Author(s):  
Parna Mukherjee ◽  
Arup K. SenGupta
Keyword(s):  
Ion Exchange ◽  
Reverse Osmosis ◽  
Relative Permeability ◽  
Exchange Selectivity

Innovative concepts of regeneration of decolorization ion exchange resins in sugar refineries

2016 ◽  
pp. 377-380
Author(s):  
Marc André Théoleyre ◽  
Anne Gonin ◽  
Dominique Paillat
Keyword(s):  
Ion Exchange ◽  
Reverse Osmosis ◽  
Energy Supply ◽  
Ion Exchange Resins ◽  
Salt Solutions ◽  
Nanofiltration Membranes ◽  
Local Conditions ◽  
Salt Consumption ◽  
Multiple Effect ◽  
Exchange Resins

Regeneration of resins used for decolorization of sugar solutions is done with concentrated salt solutions. Nanofiltration membranes have been proven effective, in terms of industrial efficiency in decreasing salt consumption. More than 90% of the salt that is necessary for regeneration can be recycled through a combination of direct recycling of intermediate eluates, the separation of colored compounds by use of very selective nanofiltration membranes and a system to concentrate salty permeates. According to specific local conditions on energy supply and cost, the concentration of salty permeates can be either a multiple effect evaporator or a combination of electrodialysis and reverse osmosis. The desalted color compound solution is sent to the molasses, limiting considerably the effluent to be treated. Starting from a liquor of 800 IU, the water requirement is limited to less than 100 L/t of sugar and the amount of wastewater can be reduced to less than 40 L/t of sugar.

Combining reverse osmosis and ion-exchange allows beet distillery condensates to be recycled as fermentable dilution water

Desalination ◽  
2015 ◽  
Vol 363 ◽  
pp. 75-81 ◽  
Author(s):  
Marie-Laure Lameloise ◽  
Marjorie Gavach ◽  
Marielle Bouix ◽  
Claire Fargues
Keyword(s):  
Ion Exchange ◽  
Reverse Osmosis ◽  
Dilution Water
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