Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Abstract

This article provides a state-of-the-art review on the uses of magnetic ion exchange (MIEX) resin in drinking water and wastewater treatment, with emphasis on removal of dissolved organic matter (DOM) from drinking water and wastewater, regeneration efficiency, removal of inorganic and synthetic organic chemicals, comparison with other anion exchange resins, and integration with other physical-chemical processes. Through laboratory jar tests, pilot plant tests, and full-scale installations for a variety of drinking water sources, MIEX resin can achieve 30-80 % removal of dissolved organic carbon (DOC), which is often higher than alum or ferric coagulation. In addition, MIEX resin has been shown to remove hydrophilic, transphilic, and hydrophobic fractions of DOM and a wide range of molecular weight fractions of DOM. As a result, MIEX pretreatment results in substantial reductions in the formation of trihalomethanes and haloacetic acids upon chlorination. MIEX resin can achieve bromide removal in the range of 10-50 %, with higher bromide removal in waters with low DOC, low alkalinity, and low sulfate. However, there are commercially available anion exchange resins that are more selective for bromide than MIEX resin. MIEX resin has been investigated in combination with coagulation, activated carbon adsorption, membrane separation, lime softening, and ozonation. MIEX pretreatment has been shown to reduce downstream chemical requirements and improve the operation of downstream processes. This is most evident for coagulation and ozonation where the coagulant dose can be reduced by 50-75 % and the ozone concentration can be increased by 40-65 %. In general, MIEX pretreatment shows minor reductions in membrane fouling. Future research should continue to investigate the integration of MIEX treatment with other processes.

Effect of humic acid on ciprofloxacin removal by magnetic multifunctional resins

“…MIEX ® produced by Orica Watercare, Australia is currently the most widely used magnetic resin. MIEX ® efficiently eliminates natural organic matter (NOM) through its quaternary amine functional groups 5 6 7 8 . NOM is the precursor of disinfection by-products, and the efficient removal of NOM can greatly improve the quality of drinking water 9 10 .…”

High-efficient removal of phthalate esters from aqueous solution with an easily regenerative magnetic resin: Hydrolytic degradation and simultaneous adsorption

“…On the other hand, the treated volume is considerably limited in the form of traditional fixed-bed resin column, along with the high capital cost Li et al, 2017a). The applications of magnetic adsorbents have received considerable attention in recent years for their advantage of easy separation (Boyer, 2015;Ma et al, 2014). MIEX resin, developed by Orica Co. Ltd., is currently the most widely applied magnetic adsorbent for multiple water treatment projects, which are mainly owing to its recognized advantages: good stability, high exchange capacity, improved kinetics and feasible regeneration (Arias-Paic et al, 2016;Boyer and Singer, 2008).…”

“…Furthermore, due to its high density and excellent settling property, MIEX resin could be applied in the form of fluidized bed reactor in a continuous process, which could greatly improve the treatment flux and get a high recovery rate (>99.9%) (Indarawis and Boyer, 2012). As a result, the resin amount is reduced to only 2-12% of conventional fixed-bed column resin dosage (Boyer, 2015;Boyer and Singer, 2008). In this scenario, catalytic degradation of PAEs by using OH-type magnetic anion exchange resin seems more attractive.…”

Preparation of Permanent Magnetic Resin Crosslinking by Diallyl Itaconate and Its Adsorptive and Anti-fouling Behaviors for Humic Acid Removal

“…MIEX resin, developed by Orica Co. Ltd, is currently the most widely used magnetic resin for NOM removal 12 . Multiple water treatment projects based on MIEX resin for water purification have been established worldwide, which are mainly owing to its recognized advantages: macroporous structure, high exchange capacity and improved kinetics 13 – 15 . Furthermore, due to its high density and excellent settling property, MIEX resin could be applied in the form of fluidized bed reactor in a continuous process with partial resin regeneration, which greatly improves the treatment flux 14 .…”

“…There is a strong need for developing more efficient and commercially available magnetic resins on the aspects of adsorption, desorption and settlement. The primary concern is how the magnetic iron oxide (γ-Fe 2 O 3 ) is embedded in the resin matrix 15 . The resulting agglomeration and rapid settling of dense magnetic microbeads in solution are the sticking points for magnetic resin adsorption processes 15 , 16 .…”