Ammonium removal from landfill leachate using natural zeolite: kinetic, equilibrium, and thermodynamic studies

Temel, Fulya Aydın; Kuleyin, Ayşe

doi:10.1080/19443994.2015.1136964

Cited by 54 publications

(17 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Subsequently, the ammonium concentration was measured in the filtrate and the time-dependent loading of the sorbent q t (mg/g) was calculated. Since it is known from published studies that the adsorption kinetics strongly depend on the stirring speed [15,21,22], a high rotation frequency of 800 rpm was chosen to determine the maximum possible adsorption kinetic values. During the test, due to sampling, the total volume was continuously reduced.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Evaluation of Different Clinoptilolite Zeolites as Adsorbent for Ammonium Removal from Highly Concentrated Synthetic Wastewater

Wasielewski

Rott

Minke

et al. 2018

Water

View full text Add to dashboard Cite

Abstract:The supply of food to the growing world population requires an increasing amount of nitrogen fertilizers, which can be achieved both by the energy-intensive Haber-Bosch process and by recovering ammonium from wastewater. Within the scope of this work, it is investigated to what extent different clinoptilolites (CLIs) can be used as ion-exchangers for the removal of ammonium from highly concentrated solutions. To this end, finely ground CLIs with different grain sizes (EcoZeo 20 and CCP 20: 0-20 µm, Micro 200: 0-200 µm) were tested for their sorption properties by varying the parameters of the sorption solution (c 0 = 1000 mg NH 4 -N/L) such as pH, temperature, or contact time. All three CLIs tested were effective at adsorbing ammonium. In a pH range from 2 to 8, all CLIs were able to eliminate ammonium equally well. Furthermore, a contact time of 60 min was sufficient to achieve 84-88% of the maximum load. At a temperature of 34 • C, the highest loading was achieved (investigated range: 10-34 • C), indicating that the adsorption process of all CLIs was exergonic and endothermic. Especially for wastewater streams with high ammonium concentrations such as sludge water from wastewater treatment plants, CLI proved to be suitable to adsorb ammonium.

show abstract

Section: Adsorption Kineticsmentioning

confidence: 99%

Evaluation of Different Clinoptilolite Zeolites as Adsorbent for Ammonium Removal from Highly Concentrated Synthetic Wastewater

Wasielewski

Rott

Minke

et al. 2018

Water

View full text Add to dashboard Cite

show abstract

“…K F is the capacity of the sorbent, and n is the Freundlich constant, calculated by the intercept and the slope of the ln qe against ln Ce plot, respectively. The heterogeneity of the sorption reaction characterized by the n value (Aydin Temel & Kuleyin 2016). When the value of 1/n is 0 , 1/n , 1, the reaction is favorable; when 1/n ¼ 1, the reaction is linear and irreversible; and when 1/n .…”

Section: Isotherms' Studymentioning

confidence: 99%

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

et al. 2021

View full text Add to dashboard Cite

Sodium-treated palygorskite (Na-Pal) sample was investigated for the sorption of Ca2+ ions with the aim of treating water hardness. The effective modification of the mineral with Na+ was verified by XRD and FT-IR techniques. Batch kinetic experiments in standard solutions were performed proving that 30 g/L of Na-Pal were highly satisfactory as the Ca2+ removal reached the 85% for 100 mg/L Ca2+ initial concentration, which is very promising for the softening of moderate or hard waters. The Ca2+ removal found to be pH and temperature independent, with high removal rates at room temperature and common pH values of water samples (pH 4–12), rendering these circumstances ideal for the low-cost maintenance of the procedure that took place within the first 5 min. The linear form of Langmuir isotherm model expressed better (R2 = 1) the Ca2+ sorption, which means that takes place at specific homogeneous sites of Na-Pal. Thermodynamic analysis proved the non-spontaneous (positive ΔG0), physical, and exothermic nature (ΔH0 = −10.8197 kJ/mol) of the reaction, while the kinetic models proved the chemisorption of Ca2+ by Na-Pal.

show abstract

“…Endothermy is also supported by the Freundlich constant K F that increased with increasing temperature (see Table 1, Section 3.1) [71]. While many authors have observed exothermic conditions for NH 4 + adsorption onto ZRT (∆H < 0) [27,29,72], others have calculated positive values of ∆H [26,57]. In all these studies, the nature of the employed materials (the type of ZRT and type of the liquid phase) varies significantly and this may results in differences in the adsorption processes, thus explaining this variability in the thermodynamic parameters.…”

Section: Thermodynamicsmentioning

confidence: 87%

Isotherms, Kinetics, and Thermodynamics of NH4+ Adsorption in Raw Liquid Manure by Using Natural Chabazite Zeolite-Rich Tuff

Galamini

Ferretti

Medoro

et al. 2020

Water

View full text Add to dashboard Cite

The search for safer and sustainable management of animal manure is a global and topical challenge, in particular for the reduction of nitrogen (N) content. The use of natural adsorbents as zeolite-rich tuffs is recognized as a valid method to recover N, in the form of ammonium (NH4+), from animal manure. While the scientific literature is rich in studies performed on synthetic solutions and using clinoptilolite zeolites as adsorbent, it lacks information concerning adsorption in real liquid manure and using other types of zeolite-rich tuffs (e.g., chabazite). This work aims at exploring the NH4+ adsorption process from raw liquid swine manure, using a chabazite-rich zeolite tuff as adsorbent. The effects of temperature, contact time, and grain size have been assessed. Isotherms, kinetic models, and thermodynamic parameters have been investigated. Harkins-Jura isotherm correlates well with the observed data, in accordance with the formation of an adsorption multilayer. Kinetic data have been explained by intraparticle diffusion and pseudo-second-order models. In conclusion, the natural chabazite tuff has proven to be a valid material for NH4+ adsorption from raw liquid swine manure. In particular, to reach the highest adsorption capacities and adsorption rates, it is recommended to use it at a fine particle size and with dosages < 6 %.

show abstract

Ammonium removal from landfill leachate using natural zeolite: kinetic, equilibrium, and thermodynamic studies

Cited by 54 publications

References 81 publications

Evaluation of Different Clinoptilolite Zeolites as Adsorbent for Ammonium Removal from Highly Concentrated Synthetic Wastewater

Evaluation of Different Clinoptilolite Zeolites as Adsorbent for Ammonium Removal from Highly Concentrated Synthetic Wastewater

Ca2+ removal from water by the use of Na-palygorskite for potential water softening

Isotherms, Kinetics, and Thermodynamics of NH4+ Adsorption in Raw Liquid Manure by Using Natural Chabazite Zeolite-Rich Tuff

Contact Info

Product

Resources

About