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how can i carry out material balance around an ion-exchanger?
I am carrying out a preliminary design for the remediation of a semiconductor wastewater. My last three unit operations are two ion-exchangers and an electrowinning unit.
however, I am having a tough time moving past the first ion exchanger. it involves the removal of ammonia using clinoptilolite. I really need the non-ionic stoichiometric balance equation to the reaction within the exchanger. I think this will help me with the material balance.
The second exchanger is gonna remove heavy metals; Sn, Cu and Pb. I don't know what resins to use for this and Iv been unable to carry out the material balance. I also need a non-ionic stoichiometric balance equation within this ion-exchanger.
1 Answer
- Anonymous8 years agoFavorite Answer
I'm not sure about your question because ion-exchanges remove ions from solution, there is no chemical reaction and there is no mass balance (as in a conventional chemical reaction). Clinoptilolite has a strong affinity for ammonia. That means that the ammonia (NH4+) will be grabbed and held by the exchange media. Since your ions must balance, the media will release Na+ (assumed) into the water. The amount of ammonia bound to the media builds up over time. Eventually all of the active sites become saturated and the media must be regenerated. The resulting discharge must then be treated via some other method. Ion exchange is used to concentrate solutions, it is not a treatment method itself (unless your plan is to send the spent media to landfill but this is seldom practical). Metal removal often uses a polymeric resin. Do a Google search for "Dow IX resin" and you will find much info regarding the materials and process.