Evaluating Magnetic Ion Exchange Resin (MIEX)® Pretreatment to Increase Ozone Disinfection and Reduce Bromate Formation

Wert, Eric C.; Edwards-Brandt, Jessica; Singer, Philip C.; Budd, George C.

doi:10.1080/01919510500250754

Cited by 24 publications

(18 citation statements)

References 5 publications

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“…For example, Johnson and Singer showed that at a given ozone dose the dissolved ozone concentration increased and the bromate formation decreased as the MIEX resin dose increased, which was due to the co-removal of DOC and bromide [32]. Pilot plant tests have also shown that MIEX pretreatment increases the dissolved ozone concentration which in turn increases the effectiveness of ozone disinfection [104]. The combination of MIEX pretreatment and ozone disinfection before final chlorination resulted in the lowest THM formation among alum coagulation, ozonation, and combined alum coagulation/ozonation [36].…”

Section: Activated Carbonmentioning

confidence: 99%

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Boyer

2015

Curr Pollution Rep

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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.

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Section: Activated Carbonmentioning

confidence: 99%

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Boyer

2015

Curr Pollution Rep

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“…NOM are undesirable in water resources because they react with chlorine and other organochlorine compounds forming trihalomethanes which are harmful to health and deteriorate the taste of water. Pretreatment of water with MIEX ozonization and disinfection resin significantly reduced the content of the dissolved organic compound and bromide ions [198]. MIEX can remove a majority of hydrophilic and significant amounts of hydrophobic compounds from the biologically treated wastewater before using the membrane system [199].…”

Section: Ion Exchange Separationsmentioning

confidence: 99%

Preparation and properties of magnetic nano‐ and microsized particles for biological and environmental separations

Horák¹,

Babič²,

Macková³

et al. 2007

J of Separation Science

321

177

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The paper presents a critical overview on magnetic nanoparticles and microspheres used as separation media in different fields of chemistry, biochemistry, biology, and environment protection. The preparation of most widely used magnetic iron oxides in appropriate form, their coating or encapsulation in polymer microspheres, and functionalization is discussed in the first part. In the second part, new developments in the main application areas of magnetic composite particles for separation and catalytical purposes are briefly described. They cover separations and isolations of toxic inorganic and organic ions, proteins, and other biopolymers, cells, and microorganisms. Only selected number of relevant papers could be included due to the restricted extent of the review.

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“…The DOC is adsorbed to the resin through ion exchange with the chloride ions at the active sites on the surface. Quaternary amide moieties act as DOC chloride exchange sites [12]. The presence of negatively charged carboxylic groups in DOC enables removal as they are attracted to the active sites [12].…”

Section: Adsorption and Desorptionmentioning

confidence: 99%

Magnetic ion exchange: Is there potential for international development?

Neale

Schäfer

2009

Desalination

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Magnetic ion exchange (MIEX ® ) is an ion exchange resin developed as an additive to existing water treatment plants where additional organic matter is to be removed. The smaller size, magnetic properties and simple regeneration using NaCl distinguishes MIEX ® from conventional ion exchange resins and hence its use in international development applications is investigated in this review article. MIEX ® has been demonstrated to remove varying levels of dissolved organic matter, inorganic anions such as nitrate and sulphate and micropollutants including non-ionic pesticides. The removal efficiency can also be influenced by temperature, pH and presence of other anions. As MIEX ® is unable to disinfect water, the most likely application within international development is as pre-treatment before disinfection or membrane filtration.Keywords: Magnetic ion exchange, international development, natural organic matter removal, micropollutant removal IntroductionMagnetic ion exchange (MIEX ® ) is a strong base anion exchange resin with magnetic properties that can be used to adsorb weak organic acidic ions from water [1]. The magnetic properties differentiate it from other ion exchange resins, as it allows for faster resin agglomeration and recovery [2]. The resin was developed with the purpose of removing dissolved organic carbon (DOC) from drinking water supplies [3]. While DOC by itself is relatively harmless, problems can occur when DOC is combined with chlorine, a common drinking water disinfectant, or bromide as they can form disinfection by-products (DBP), which are potential carcinogens [2]. In addition, the removal of DOC from water reduces the need for residual disinfection of bacterial regrowth during distribution, as well as customer complaints relating to taste, odour and colour of the water [4] The objective of this paper is to review potential applications of this ion exchange resin in international development. One of the main problems facing international development is the provision of safe drinking water, with over 1.1 billion people lacking access to this basic need [5]. Waterborne diseases, associated with pathogenic bacteria, viruses and protozoa, are the most common cause of illness and death related to water and sanitation within developing countries [6]. Therefore, improved microbiological safety through the removal of pathogens is essential for international development. While MIEX ® can not be used to disinfect or physically remove bacteria or viruses, it can remove DPB precursors, reduce chlorine demand, and therefore reduce DPB risk [7]. In addition, it can be coupled with disinfection processes such as ozonation or membrane filtration such as ultrafiltration. This review will describe the principles of MIEX ® and focus on its applicability to international development by discussing its ability to remove DOC, as well as a range of inorganic and organic contaminants from water and examine the possibility of MIEX ® integration with existing water treatment options. The issue of brine waste disposa...

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Evaluating Magnetic Ion Exchange Resin (MIEX)® Pretreatment to Increase Ozone Disinfection and Reduce Bromate Formation

Cited by 24 publications

References 5 publications

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Removal of Dissolved Organic Matter by Magnetic Ion Exchange Resin

Preparation and properties of magnetic nano‐ and microsized particles for biological and environmental separations

Magnetic ion exchange: Is there potential for international development?

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