Sorption of Ammonium‐Ions by Clinoptilolite and by Strongly Acidic Cation Exchangers

Abstract

The sorption capacity of two natural sorbents of different origin and of Wofatit KPS is determined by dynamic laboratory investigations and the influence of a thermal pretreatment of clinoptilolite, of the type and quantity of regenerants and of the presence of other cations is investigated. There are represented results of the ammonia removal from biologically treated municipal wastewater and of the removal of caesium-ions from laundry wastewaters. The capacity of clinoptilolite is lower than that of the ion-exchange resin, but clinoptilolite has the advantage of a considerably higher affinity for ammonium-ions, so that it can be used also in the presence of other salts in water t o be treated. The ammonium concentration should not exceed 30 mg/l, in order t o avoid too short filter runs.

Ammonium removal from anaerobic digester effluent by ion exchange

“…Beside cations, also organic contaminants are considered to reduce the ammonium uptake, as experienced in other studies (Farkas et al 2005 Generally an exchange capacity of only 20 -25% compared to strong acidic cation exchangers is predicted (Vokacova et al 1986). With view on that, the performance of the clinoptilolite used herein is significantly above average.…”

“…Thornton et al (2007) and that the current flow rates are too high for a full exchange. Therefore clinoptilolite seems more applicable for municipal waste water with its lower ammonium concentration (Vokacova et al 1986 …”

“…Even if they are present only at minor concentrations, they have a much higher sorption affinity than the monovalent ions (Chen et al 2002). Also other literature data suggests, that calcium ions are strongly sorbed to the exchanger and permanently decrease its ion exchange capacity (Vokacova et al 1986;Hedströ m 2001) and therefore need to be removed from time to time.…”

“…Clinoptilolite has been found very effective for removing ammonia(Karadag et al 2007), since it has a high affinity towards monovalent cations(Vokacova et al 1986;Farkas et al 2005;Wang et al 2007). Still the CEC…”

Lewatit S100 in Drinking Water Treatment for Ammonia Removal

“…One of the common processes for drinking water treatment applied in recent times is an ion exchange process. Removal of ammonia from water has been investigated by many researchers (Gaspard and Martin, 1983;Hlavay et al, 1983;Vokáčová, et al, 1986;Hódi et al, 1995;Booker et al, 1996;Beler Baykal and Akca Guven, 1997;Cooney et al, 1999). A simple comparison of ammonia removal by both natural and a synthetic material was attempted by (Haralambous et al 1992).…”