The influence of selected factors on the removal of anionic contaminants from water by means of ion exchange MIEX®DOC process

The study of the effectiveness of the removal of anionic natural organic matter (fulvic acids-FA and humic acids-HA) and inorganic anions (P, Br, NO ₃) in MIEX®DOC process was performed. The influence of physico-chemical parameters of feed water on the process performance was investigated. The ion exchange process was carried out using strongly basic, macroporous polystyrene resin MIEX® by Orica Watercare. The synthetic feed waters differ in composition, i.e. concentration of FA and HA (ca. 6 and 12 mg/L), anions content (F-, Br, NO₃) and of various alkalinity (ca. 20 and 120 mg/L as CaCO₃) were used. The study confirmed the possibility of application of MIEX®DOC process for removal of anionic contaminants from water. It also showed the significant impact of feed water parameters on the process effectiveness. Moreover, the strong dependence of anions (P, Br, NO₃) removal, FA and HA concentration on the resin dose was revealed.