Ion exchange uptake of ammonium in wastewater from a Sewage Treatment Plant by zeolitic materials from fly ash

Juan, Roberto; Hernández, Santiago Cortés; Andrés, José Manuel Palao; Ruiz, Carolina Castillo

doi:10.1016/j.jhazmat.2008.04.025

Cited by 60 publications

(30 citation statements)

References 14 publications

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“…Therefore, the amount of Ca 2+ for ion exchange with ammonium only contributes a small part of Ca 2+ present in the solution treated by HC-Z. The previous studies showed that Ca 2+ -ion can be released by leaching of Ca-compounds present in zeolitic materials when the amount of CaO was above 10% [9]. The CaO content in HC-Z was determined as 32.51% (Table 1), thus HC-Z was washed with distilled water to investigate whether there was Ca 2+ -ion leaching from Ca-component in HC-Z or not.…”

Section: Adsorbentmentioning

confidence: 96%

“…The previous studies showed that the double charge of Ca 2+ makes the exchangewith ammonium more difficult [9]. Therefore, HC-Z was washed with NaCl solution (1 mol/L), which can substitute the exchangeable Ca 2+ with Na + in addition to removing the leaching Ca 2+ -ions.…”

Section: Adsorbentmentioning

confidence: 99%

“…As a resource utilization approach, extensive research has been carried out to synthesize zeolite using fly ash [7]. The synthesized zeolites are also used to remove the ammonium from wastewater, and the results showed that they are promising ion exchangers for ammonium removal [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Zhang

et al. 2011

Desalination

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Keywords:Low-calcium fly ash High-calcium fly ash Synthesized zeolite Ammonium removal Select criteria of raw fly ash In this study, zeolites are synthesized from low-calcium (LC-Z) and high-calcium (HC-Z) fly ashes, respectively. The changes of mineralogy, morphology, cation exchange capacity (CEC) and specific surface area (SSA) are investigated during the synthesis process. The equilibrium uptake of ammonium on the two synthesized zeolites is compared. The main crystals of LC-Z and HC-Z are identified as faujasite and gismondine, respectively. The CEC and SSA increase significantly following the conversion process. The kinetic studies showed that the adsorption process of ammonium on both LC-Z and HC-Z follows Ho's pseudosecond-order model. Langmuir model agrees better with the equilibrium data for LC-Z, while Freundlich model gives the better fit for HC-Z. The obtained maximum ammonium uptake capacities are 23.8 mg/g for LC-Z and 3.17 mg/g for HC-Z in the synthetic solution. LC-Z also exhibits much better performance in ammonium uptake in effluent from a sewage treatment plant than HC-Z. These results indicate that LC-Z is a promising material for ammonium removal whereas HC-Z is not. The Ca 2+ leaching and the lower zeolite content in HC-Z account for its lower uptake capacity. Thus, the low-calcium fly ash should be chosen preferentially as the raw material of the zeolite synthesis for ammonium removal.

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Section: Adsorbentmentioning

confidence: 96%

Section: Adsorbentmentioning

confidence: 99%

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Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Zhang

et al. 2011

Desalination

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“…In the single-step hydrothermal processing, crystal variety in the end zeolite products became the major drawbacks of this method [11][12][13] . In the twostep hydrothermal processing, only the liquid alkali extracts from y ash were used in the production of the zeolite, which leaves behind yet another solid waste product and gives a very low production yield [14][15][16] . Previously, only one type of pure zeolite was utilized in the investigation and it is not clear whether the same methodology was suitable to synthesize two different kinds of pure zeolites from the same raw material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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Acid-extracting residue of circulating uidized bed (CFB) y ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, ne particles of acid residues have been reused to prepare zeolite Na-X and Na-P with high purity and intensity. Acid residue was used to synthesize zeolite Na-X and Na-P using a single-step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na-X or Na-P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

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“…Zeolite synthesized from such a material has better pollutant-removing abilities than natural zeolite due to the high zeolite content in the former [14]. The use of zeolite synthesized from fly ash in ammonium removal has been reported in the literature [15][16][17]. Juan et al [15] synthesized zeolite from fly ash by alkali hydrothermal treatment, and found that the obtained material effectively removed ammonium from wastewater produced by a sewage treatment plant.…”

Section: Introductionmentioning

confidence: 99%

Removal of ammonium from aqueous solutions using zeolite synthesized from fly ash by a fusion method

Zhang

et al. 2011

Desalination

168

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This article investigates the removal of ammonium from aqueous solutions using zeolite synthesized from fly ash by a fusion method, which combines alkaline fusion followed by hydrothermal treatment. The cation exchange capacity increases from 0.03 to 2.79 meq/g during the synthesis process. The effects of contact time, pH, initial ammonium concentration, adsorbent dosage, and the presence of other cations and anions are examined by batch experiments. The findings show that these parameters have significant effects on the ammonium removal using the synthesized zeolite. The effect of cations follows the order K . The Lagergren first-order, Ho' pseudo-second-order, and intraparticle diffusion kinetic models are employed to describe the kinetic data, and Ho' pseudo-second-order model provides excellent fitting. The equilibrium isotherm data are fitted to the Langmuir, Freundlich, Koble-Corrigan, Tempkin and Dubinin-Radushkevich models; the Koble-Corrigan model gives the best fit. The thermodynamic study reveals that ammonium uptake by the synthesized zeolite is an exothermic reaction. The maximum ammonium uptake capacity obtained is 24.3 mg/g. The regenerated zeolite has almost the same ammonium uptake capacity as the original zeolite. These results indicate that the synthesized zeolite is a promising material for removing ammonium from wastewater.

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Ion exchange uptake of ammonium in wastewater from a Sewage Treatment Plant by zeolitic materials from fly ash

Cited by 60 publications

References 14 publications

Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Removal of ammonium from aqueous solutions using zeolite synthesized from fly ash by a fusion method

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