Study of the ion exchange equilibrium of Cl−, $$ NO_3^{ - } $$ , and $$ SO_4^{{2 - }} $$ ions on the AMX membrane

Co-removal of phosphorus and nitrogen with commercial 201 × 7 anion exchange resin during tertiary treatment of WWTP effluent and phosphate recovery

“…It is equal to the ratio of the distribution coefficients between the exchanger phase and the aqueous phase [38,39]. According to the Gaines-Thomas convention [40], the selectivity coefficient k j i can be expressed as:…”

“…The selectivity of 201 × 7 resin for PO 3À 4 -P over other anions was determined by shaking 20 mg resin sample with 100 mL solution at pH 7.0 and 298 K, which contained binary mixture of PO 3À 4 -P and another anion with equal concentrations of 0.05 M [38]. After equilibrium, the concentration of each anion in the supernatant was measured, and equilibrium concentrations of anions in the 201 × 7 resin phase were calculated.…”

Impact of resin loading on ion exchange equilibrium for removal of organic matter and inorganic ions

“…The majority of these models are based on the law of mass action and are frequently combined with adsorption isotherms (Dranoff and Lapidus, 1957;Boyer, Baird and Nirdosh, 1999;Hannachi, Guesmi and Hamrouni, 2013), where multicomponent systems are considered equivalent to a combination of independent binary systems and ideality is assumed in both aqueous and resin phases. The research from Zhang et al (2014) differs slightly from the others as it relies on polyparameter linear-free energy relationships.…”

Erratum to ‘Single and binary ion sorption equilibria of monovalent and divalent ions in commercial ion exchange membranes’ [Water Research 175 (2020) 115681]

“…However, it is of practical importance to quantify and obtain a better understanding of the competitive absorption of a mixture of ions in commercial IEMs. This has been conducted by a number of research groups who have used various cation exchange membranes (Bontha and Pintauro 1994, Chapotot et al 1994, Palomo and Pintauro 2003, Pintauro et al 1995 and anion exchange membranes (Guesmi et al 2010, Hannachi et al 2013, Malewitz et al 2007, mostly by varying the mixing ratios of the two divalent and monovalent ions at a fixed total concentration.…”