Clinoptilolite: a possible support material for nitrifying biofilms for effective control of ammonium effluent quality?

2005 ◽  
Vol 51 (11) ◽  
pp. 63-70 ◽  
Author(s):  
H. Inan ◽  
B. Beler Baykal
Keyword(s):  
Ion Exchange ◽  
High Capacity ◽  
Exchange Capacity ◽  
Quality Data ◽  
Ammonium Ion ◽  
Effective Control ◽  
Support Material ◽  
Ion Exchange Capacity ◽  
Effluent Quality ◽  
Peak Loads

Ammonium selective natural zeolite clinoptilolite is suggested as a possible support material for nitrifying biofilms to help improve effluent ammonium quality through its high capacity of ammonium removal in the process of ion exchange. This will especially be helpful in cases where the biofilter receives peak or variable loads routinely or occasionally. At the time of peak loads or shocks of ammonium, ion exchange capacity will provide a buffer for the effluent ammonium quality. Data to support this suggestion is presented.

An experimental study of sorption properties of natural zeolite-containing rocks and their ability for purification of aquatic solutions contaminated with Ni and Zn

2020 ◽  
Author(s):  
Liudmila Kolmykova ◽  
Valentina Nikashina ◽  
Elena Korobova
Keyword(s):  
Ion Exchange ◽  
Natural Zeolite ◽  
Natural Waters ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Geochemical Barrier ◽  
Solid Domestic Waste ◽  
Ion Exchange Capacity ◽  
Model Solutions

<p>Sorption parameters of natural zeolite-containing tripolite from the Khotynetsky deposit (Russia, Oryol region) were studied in a series of experiments to evaluate possibility of its usage as a geochemical barrier for teсhnogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> contaminating soils and ground waters. <br>Firstly, the tripolite total ion-exchange capacity was established by its saturation with ammonium ion and evaluating its content in the initial and ammonium forms with the help of X-ray fluorescence method. Secondly, the kinetic characteristics, namely the time necessary to reach the equilibrium state of the rock-water system containing Ni<sup>2+</sup> and Zn<sup>2+</sup> ions were determined in batch experiments using the method of "limited volume". The latter experiment was conducted using 0.5 g tripolite with 250 ml model solutions simulating natural river water (0.003 н CaCl<sub>2</sub>) and filtration water from solid domestic waste landfill (0.06 н CaCl<sub>2</sub>) and containing  2 mg/l Ni<sup>2+</sup> and  Zn<sup>2+</sup>. The time of contact between the sorbent and the model solution varied from 2 hours to 21 days. Thirdly, basing on reference data on the real content of heavy metals in the filtrates of various landfills, an experiment on determination of the tripolite equilibrium exchange (and adsorption) capacity was carried out. The prepared model solutions in the latter experiment contained 2, 5, 7 and 10 mg/l of Ni<sup>2+</sup> and Zn<sup>2+</sup>. The amount of Ni<sup>2+</sup> and Zn<sup>2+  </sup>in solutions was determined by the ICP-AES.<br>According to the obtained results, the total ion-exchange capacity of the natural tripolite equaled to 1.18 mg-eq/g. The sorption isotherms based on kinetic experiments showed that equilibrium in the studied rock-solution system took place after 200 to 500 hours of interaction. Despite natural scattering of experimental points in the range of the used Ni<sup>2+</sup> and Zn<sup>2+</sup> concentrations in the third experiment which lasted 21 days, the sorption of the studied ions by the natural tripolite can be approximated by a linear isotherm, zinc being sorbed much better than nickel. The average values of distribution coefficients (Kd) obtained for 0.003 n CaCl<sub>2</sub> aquatic solution equaled to 2.7*103 ml/g for Ni<sup>2+</sup> and 6.7*103 ml/g for Zn<sup>2+</sup>.<br>Therefore, natural tripolite of the Khotinetsky deposit may well be used as a natural geochemical barrier for extraction of technogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> from natural waters draining landfills and contaminated by these ions.</p><p> </p>

scholarly journals Removal of Ammonium Ions from Aqueous Solutions Using Weathered Halloysite

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4359
Author(s):  
Jacek Leszczyński
Keyword(s):  
Ion Exchange ◽  
Natural Waters ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Order Kinetic ◽  
Ammonium Ions ◽  
Ion Exchange Capacity ◽  
Ion Removal ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This study investigated the use of weathered halloysite as an ion exchange material for ammonium removal from water. The study was conducted under static and dynamic conditions. The influence of such parameters as the preliminary concentration of ammonium ions, dose of halloysite, and pH was examined in periodic studies. The ion exchange capacity of weathered halloysite under various regeneration conditions such as concentration, excess of regeneration solution and the pH at which the regeneration was performed was also determined. The effect of flow velocity, initial NH4+-ions concentration was studied in column tests and the weathered halloysite’s ion -exchange capacity was also determined. The best results of ammonium ion removal were obtained at pH 6. The equilibrium isotherms were described using the Langmuir and Freundlich models. The results of periodic studies show a good fit for the data of both models, with Langmuir isotherms reflecting the removal of ammonium ions better. A good match for the data (R2 > 0.99) was provided by a pseudo second-order kinetic model. The obtained results indicate that a properly prepared halloysite can be a useful mineral for the removal of dangerous substances, such as ammonium ions, present in natural waters.

Research on Characterization and Application of High-Performance Ion Exchange Material

2013 ◽  
Vol 652-654 ◽  
pp. 1704-1709
Author(s):  
Qiong Qiong Liu ◽  
Xin Tan ◽  
Xiao Long Shao
Keyword(s):  
Ion Exchange ◽  
High Performance ◽  
Ammonia Nitrogen ◽  
Exchange Capacity ◽  
Raw Material ◽  
Ammonium Ion ◽  
Ion Exchange Capacity ◽  
Feature Evaluation ◽  
Modification Process ◽  
Exchange Material

The object of this research is to investigate the removal of nitrogen in the form of ammonium ion (NH4+-N) from aqueous solutions using Na-form of high-performance ammonium ion-exchange material. The Chinese Kaolin from the province of Guangzhou is used as the raw material and modified to prepare the ion-exchange materials. According to CEC measurement, the obtained ammonium ion-exchange material had an ammonium ion exchange capacity greater than 75mgNH4+-N/g and can be used to remove ammonia nitrogen in water treatment. In this paper, several surface feature evaluation methods（SEM、XPS、IR）are used to discuss and analyze the modification process of kaolin and the action mechanism and modification results of the ammonia ion exchange material.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Quantitative Determination Of Carboxyl Groups In Cellulose Polymers Utilizing Their Ion Exchange Capacity And Using A Complexometric Titration

2004 ◽  
Vol 8 (3) ◽  
pp. 145-146 ◽  
Author(s):  
Lidija Fras ◽  
Karin Stana-Kleinschek ◽  
Volker Ribitsch ◽  
Majda Sfiligoj-Smole ◽  
Tatjana Kreze
Keyword(s):  
Ion Exchange ◽  
Quantitative Determination ◽  
Exchange Capacity ◽  
Carboxyl Groups ◽  
Ion Exchange Capacity ◽  
Complexometric Titration

The Synthesis and Ion-Exchange Property of Inorganic Material Mg1.5Mn0.5Ti0.75O4

2012 ◽  
Vol 511 ◽  
pp. 105-108
Author(s):  
Jin He Jiang
Keyword(s):  
Ion Exchange ◽  
Inorganic Material ◽  
Exchange Capacity ◽  
Exchange Property ◽  
Insertion Reaction ◽  
Ion Exchange Capacity ◽  
X Ray ◽  
Thermal Crystallization ◽  
Crystallization Method ◽  
Saturation Capacity

Mg1.5Mn0.5Ti0.75O4 was prepared by a coprecipitation/thermal crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The acid treatments of Mg1.5Mn0.5Ti0.75O4 caused Mg2+ extractions of more than 72%, while the dissolutions of Mn4+ and Ti4+ were less than 8.2%. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 10.6mmol/g for Li+.

scholarly journals Polymer Electrolyte Membranes Based on Nafion and a Superacidic Inorganic Additive for Fuel Cell Applications

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 914 ◽  
Author(s):  
Lucia Mazzapioda ◽  
Stefania Panero ◽  
Maria Assunta Navarra
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Proton Exchange Membrane ◽  
Sol Gel ◽  
Composite Membranes ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Thermal Transitions ◽  
Ion Exchange Capacity ◽  
Electrolyte Membranes

Nafion composite membranes, containing different amounts of mesoporous sulfated titanium oxide (TiO2-SO4) were prepared by solvent-casting and tested in proton exchange membrane fuel cells (PEMFCs), operating at very low humidification levels. The TiO2-SO4 additive was originally synthesized by a sol-gel method and characterized through x-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and ion exchange capacity (IEC). Peculiar properties of the composite membranes, such as the thermal transitions and ion exchange capacity, were investigated and here discussed. When used as an electrolyte in the fuel cell, the composite membrane guaranteed an improvement with respect to bare Nafion systems at 30% relative humidity and 110 °C, exhibiting higher power and current densities.

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