The mechanism of ion exchange and adsorption coexist on medium-low concentration ammonium-nitrogen removal by ion-exchange resin.
In this study, the removal of medium-low concentration ammonium-nitrogen ([Formula: see text]) from waters and wastewaters on D113 resin was investigated with respect to pH, initial [Formula: see text] concentration, temperature and contact time. The equilibrium of [Formula: see text] on D113 resin reached in 20-30 min. The process of [Formula: see text] removal by D113 resin fitted Langmuir isotherm well. The pseudo second-order kinetic and intra-particle diffusion models were used to investigate the kinetic data of [Formula: see text] on D113 resin. The desorption solution can be returned to production after pretreatment. The mechanism of removal of [Formula: see text] by D113 resin was coexistence of adsorption and cation exchange. When the dosage of D113 resin was 5 g L(-1), pH 6, contact 30 min at room temperature, initial [Formula: see text] concentration being 116 mg L(-1) in rare earth metallurgical wastewater was reduced to 13 mg L(-1) after adsorption treatment.
a School of Resource and Environmental Engineering , Jiangxi University of Science and Technology , 156 Kejia Ave., Ganzhou Jiangxi 341000 , People's Republic of China.
Chen
C
Yunnen
Luo
L
Xiaoyan
Xiong
X
Changshi
Liang
L
Liming
D000327:Adsorption; D064751:Ammonium Compounds / Q000302:isolation & purification*; D002411:Cation Exchange Resins / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D008669:Metallurgy; D009584:Nitrogen / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000032:analysis; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D064751:Ammonium Compounds; D002411:Cation Exchange Resins; D009584:Nitrogen; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical
D113 resin; adsorption; ammonium–nitrogen; ion exchange; mechanism