Combined ion exchange treatment for removal of dissolved organic matter and hardness

Apell, Jennifer N.; Boyer, Treavor H.

doi:10.1016/j.watres.2010.01.004

Cited by 139 publications

(74 citation statements)

References 40 publications

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“…Considered comprehensively, the results obtained from the energy changes analysis during the adsorption of TA adsorbed on MIEX resin, we propose that the adsorption of TA onto MIEX resin is considered to be the physical adsorption. However, previous researchers have demonstrated that the removal of NOM adsorbed on MIEX was considered to be chemical adsorption (ion exchange) mainly dominating adsorption [24]. In the present study we only give the finding that the adsorption of TA on MIEX resin involves physical adsorption.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 70%

“…Based on these advantages, MIEX resin has been utilized to remove different pollutants from raw water, such as NOM [21,24], inorganic anion ions [25][26][27], and micro-pollutants [23,28]. With relation to the removal of NOM from raw water using MIEX resin, previous research has demonstrated that removal efficacy was usually described by some comprehensive parameters of organic matter, such as DOC and UV 254 [24]. T. Bond et al found that MIEX resin with a dosage of 10 mL/L can remove 56-92% TA from water [29].…”

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confidence: 99%

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Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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Tannic acid (TA) is a component of natural organic matter (NOM) and is ubiquitously present in most surface and groundwater due to the decomposition of plant biomass [1][2]. Previous research has demonstrated that TA is toxic for aquatic organisms such as algae, phytoplankton, fish, and invertebrates, which can cause serious environment problems [3]. Particularly, TA can react with chlorine and form carcinogenic disinfection by-products (DBPs) during the conventional chlorination disinfection process of drinking water [4][5]. Therefore, it is necessary to seek effective methods for reducing and removing TA from raw water. [12,16] have been utilized to remove TA from water and wastewater. Among different adsorbents, the anion ion-exchange resin is considered one of the most effective methods due to its high removal efficiency [17]. As a novel anion ionexchange resin, magnetic ion exchange (MIEX) resin can be a potential candidate for TA removal with its promising technology for NOM removal from drinking water [18].Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) This study evaluated the removal characteristics of tanic acid (TA) adsorbed on MIEX resin by batch experiments. MIEX resin can effectively remove TA from raw water at pH 6-9. Chloride and sulfate have adverse effect on the removal of TA. Conversely, bicarbonate can further the removal of TA. The Elovich model is the most suitable for depicting the kinetic process, and liquid film diffusion dominates the adsorption rate. The Freundlich model is reliable for describing the adsorption equilibrium. Adsorption is an endothermic, entropy-driving, and thermodynamically spontaneous process. The energy changes confirm the physical adsorption and dominate adsorption behavior. The sodium chloride solution (0.5%) can effectively regenerate the MIEX resin saturated TA, and the regenerated resin can be used circularly. Therefore, MIEX resin is a promising adsorbent for the removal of TA from raw water.

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Section: Adsorption Thermodynamicsmentioning

confidence: 70%

mentioning

confidence: 99%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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“…Various other methods including membrane precipitation, phytoextraction, flocculation, solvent extraction, ultrafiltration, reverse osmosis, electrodialysis, and adsorption have been studied for the removal of a wide variety of cations 2 Journal of Chemistry from water streams including magnesium and calcium [15][16][17]. Most of these are either inefficient or expensive and result in the generation of large amounts of sludge.…”

Section: Introductionmentioning

confidence: 99%

Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite

Guyo

Phiri

Chigondo

2017

Journal of Chemistry

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Metakaolin zeolite-A was synthesized from thermally activated kaolin clay and characterized by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction Spectroscopy. The effects of pH (2-10), contact time (10-180 min), initial concentration (5-120 mgL −1 ), and dosage (0.1-2 g) and their interactions were investigated using response surface methodology following a central composite design. Optimum removal (87.70%) was obtained at pH 6, contact time 180 min, initial concentration 40.0 mgL −1 , and adsorbent dosage 1.0 g by Excel Solver using the GRG solving method. The adsorption data fitted best to the Langmuir model with correlation coefficient 2 = 0.993 and Chi-square value 2 = 4.76. The Freundlich isotherm gave a correlation coefficient 2 = 0.933 and 2 = 37.91. The adsorption process followed the pseudo-second-order model. The calculated thermodynamic parameters showed that the adsorption process was endothermic and not thermodynamically spontaneous. The studied zeolite-A can therefore be used as a promising adsorbent for the removal of Ca(II) ions from aqueous solutions.

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“…The MIEX has a great deal of advantage such as small pore size [14,15], magnetic properties, high density and settlement rate due to magnetized iron oxide incorporated into the polymer matrix, providing much greater external surface area that allows rapid sorption kinetic and a recovery rate of greater than 99.9% as long as the regeneration method is appropriate [16,17]. Up to now, many researches have been carried out on the combination of MIEX with traditional treatment technique and it has been proved that the MIEX, as a pre-treatment process, could significantly improve the efficiency of coagulation in removing dissolved organic matter, phosphorus and hardness [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of enhanced coagulation coupled with magnetic ion exchange (MIEX) in natural organic matter and sulfamethoxazole removals: The role of Al-based coagulant characteristic

Wang

et al. 2016

Separation and Purification Technology

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Combined ion exchange treatment for removal of dissolved organic matter and hardness

Cited by 139 publications

References 40 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite

Evaluation of enhanced coagulation coupled with magnetic ion exchange (MIEX) in natural organic matter and sulfamethoxazole removals: The role of Al-based coagulant characteristic

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