scholarly journals Zeolite as a Potential Medium for Ammonium Recovery and Second Cheese Whey Treatment

Water ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 136 ◽  
Author(s):  
Aggelos Kotoulas ◽  
Dimitra Agathou ◽  
Irene Triantaphyllidou ◽  
Triantafyllos Tatoulis ◽  
Christos Akratos ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Cheese Whey ◽  
Freundlich Isotherm ◽  
Operating Mode ◽  
Column Experiments ◽  
Removal Capacity ◽  
N Removal ◽  
Slow Release Fertilizers ◽  
Nitrogen Nutrients ◽  
Adsorption Rates

The efficiency of natural zeolite to remove ammonium from artificial wastewater (ammonium aqueous solutions) and to treat second cheese whey was examined, aiming to recover nitrogen nutrients that can be used for further applications, such as slow-release fertilizers. Sorption experiments were performed using artificial wastewater and zeolite of different granulometries (i.e., 0.71–1.0, 1.8–2.0, 2.0–2.8, 2.8–4.0, and 4.0–5.0 mm). The granulometry of the zeolite had no significant effect on its ability to absorb ammonium. Nevertheless, smaller particles (0.71–1.0 mm) exhibited quicker NH4+-N adsorption rates of up to 93.0% in the first 10 min. Maximum ammonium removal efficiency by the zeolite was achieved at ammonium concentrations ranging from 10 to 80 mg/L. Kinetic experiments revealed that chemisorption is the mechanism behind the adsorption process of ammonium on zeolite, while the Freundlich isotherm model fitted the experimental data well. Column sorption experiments under batch operating mode were performed using artificial wastewater and second cheese whey. Column experiments with artificial wastewater showed high NH4+-N removal rates (over 96% in the first 120 min) for all granulometries and initial NH4+-N concentrations tested (200 and 5000 mg/L). Column experiments with second cheese whey revealed that natural zeolite can remove significant organic loads (up to 40%, 14.53 mg COD/g of zeolite) and NH4+-N (about 99%). For PO43−-P, the zeolite appeared to saturate after day 1 of the experiments at a removal capacity of 0.15 mg P/g of zeolite. Desorption experiments with water resulted in low NH4+-N and PO43−-P desorption rates indicating that the zeolite could be used as a substrate for slow nitrogen release in soils.

Adsorption of BP-A onto Modified Zeolite and Main Influencing Factors

2013 ◽  
Vol 711 ◽  
pp. 67-72
Author(s):  
Gang Ren ◽  
Yao Ming Du ◽  
Yan Yu
Keyword(s):  
Water Treatment ◽  
Bisphenol A ◽  
Influencing Factors ◽  
Natural Zeolite ◽  
Freundlich Isotherm ◽  
Specific Area ◽  
Column Experiments ◽  
Sorption Behaviour ◽  
Modified Zeolite ◽  
Pollution Problem

Due to the hazard bringing to human, Bisphenol A pollution problem has drawn more and more attention in water treatment field. This study has developed a kind of modified zeolite as absorbent to remove it. Natural zeolite and chitosan were adopted in experiments. Results indicated that the modified zeolite bore more pore volumn and specific area than natural zeolite. To modified zeolite, natural zeolite and chitosan the adsorption of bisphenol was finished in 6-8h. Modified zeolite showed relatively excellent adsoptive capicity in batch and column experiments. The Freundlich isotherm was suitable in describing the sorption behaviour. Organic matters in water might be an important factor to debase the adsorption. To practice application velocity of 4.2-6.1 m·h-1 was suitable and the form of several column connected in serious was recommended.

scholarly journals Biochar from Agricultural by-Products for the Removal of Lead and Cadmium from Drinking Water

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2933
Author(s):  
Edgar Pineda Puglla ◽  
Diana Guaya ◽  
Cristhian Tituana ◽  
Francisco Osorio ◽  
María J. García-Ruiz
Keyword(s):  
Drinking Water ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Peanut Shell ◽  
Experimental Conditions ◽  
Lower Efficiency ◽  
Lead And Cadmium ◽  
Removal Capacity ◽  
Removal Of Heavy Metals

This study reports the adsorption capacity of lead Pb2+ and cadmium Cd2+ of biochar obtained from: peanut shell (BCM), “chonta” pulp (BCH) and corn cob (BZM) calcined at 500, 600 and 700 °C, respectively. The optimal adsorbent dose, pH, maximum adsorption capacity and adsorption kinetics were evaluated. The biochar with the highest Pb2+ and Cd2+ removal capacity is obtained from the peanut shell (BCM) calcined at 565 °C in 45 min. The optimal experimental conditions were: 14 g L−1 (dose of sorbent) and pH between 5 and 7. The sorption experimental data were best fitted to the Freundlich isotherm model. High removal rates were obtained: 95.96% for Pb2+ and 99.05. for Cd2+. The BCH and BZM revealed lower efficiency of Pb2+ and Cd2+ removal than BCM biochar. The results suggest that biochar may be useful for the removal of heavy metals (Pb2+ and Cd2+) from drinking water.

scholarly journals Enhanced biosorption of Cr(VI) using cotton fibers coated with chitosan – role of ester bonds

2018 ◽  
Vol 78 (3) ◽  
pp. 476-486 ◽  
Author(s):  
Sergio I. Rojas ◽  
Diana C. Duarte ◽  
Sergio D. Mosquera ◽  
Felipe Salcedo ◽  
Juan P. Hinestroza ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Chitosan Solution ◽  
Cotton Fibers ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Amino Groups ◽  
Removal Capacity

Abstract We report on the role of ester bonds in the enhanced removal of hexavalent chromium from water using cotton fibers coated with chitosan. Adsorption capacities up to five times higher than those of the unmodified fibers were observed when the cotton fibers were exposed to an NaOH, followed by citric acid (0.97 M), and a chitosan solution (2%). We found that the use of NaOH favors the formation of ester bonds over amide bonds on the surface of the cotton fibers. This increase in the surface density of ester bonds generates an increase in the amount of exposed amino groups from the chitosan, hence increasing the removal capacity of the modified fibers. Experimental results also reveal that the adsorption is induced by the electrostatic attraction between the protonated amino groups on the surface and the negatively charged chromium ions in the water. Adsorption isotherms and kinetic studies indicated that the adsorption process fits the Langmuir and the Freundlich isotherm models as well as the pseudo-first and pseudo-second order kinetic models. These results can open a new avenue for the manufacturing of fibers with enhanced removal capacities for hexavalent chromium.

Equilibrium and Kinetics Studies for Adsorption of Cu(II) from Aqueous Solution by Modified Phosphogypusum

2012 ◽  
Vol 518-523 ◽  
pp. 369-375 ◽  
Author(s):  
Yue Hong Yang ◽  
Dun Tao Shu ◽  
Ting Dong Fu ◽  
Huai Yu Zhang
Keyword(s):  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Wet Process ◽  
Removal Capacity ◽  
Adsorbate Concentration ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Best Fit

The purpose of this study was to investigate the adsorption of Cu(II) on phosphogypsum, a waste material from the manufacture of phosphoric acid by wet process. The removal capacity of phosphogypsum for Cu(II) ions was studied as a function of solution pH, contact time, adsorbent dosage and adsorbate concentration. Before batch adsorption study, phosphogypsum was pre-conditioned by calcine without water. The Langmuir and Freundlich theories were used to describe the Cu(II) adsorption process, and the Freundlich isotherm showed the best fit to the process. The adsorptions of Cu(II) followed pseudo-second-order kinetics. Maximum adsorption capacity of lime-preconditioned phosphogypsum was found to be 2.824 mg/g. The results showed that the phoshogypsum is a suitable adsorbent for the removal of Cu(II) ions from aqueous solutions.

scholarly journals Bioadsorption of lead(II) over the pulp of Acrocomia aculeata

2021 ◽  
Vol 46 (4) ◽  
pp. 38-46
Author(s):  
Alexandra Novak ◽  
F�tima Yubero ◽  
Diana Diez-P�rez-N��ez ◽  
Fernando Luis Fertonani ◽  
Brenda Gisselle Da Silva Britez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Column Experiments ◽  
Maximum Adsorption Capacity ◽  
Batch Experiments ◽  
Adsorption Data ◽  
Acrocomia Aculeata ◽  
Scanning Electron

The adsorption of lead in aqueous solution onto Acrocomia aculeata pulp was examined. The pulp was characterized in the presence and absence of lead using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG-DTA), and scanning electron microscopy (SEM). Sulfur and oxygen bonds were responsible for adsorbing lead onto the pulp surface. The TG-DTA profile proved that adding sodium azide increases the pulp�s thermal stability until 200 �C. Adsorption data in batch and column systems were analyzed to understand the pulp adsorption compared to other biomaterials. In the batch experiments, the removal efficiency reached a maximum of 91.9% when a solution of 50 ppm of lead was placed in contact with the pulp for 30 min and fit Freundlich isotherm behavior. In the column experiments, the theoretical maximum adsorption capacity was found to be 11.97 mg g�1; more column data is needed to compare column results to other studies. Further studies to improve the pulp adsorption capacity are needed for it to be a competitive biomaterial for water treatment.

scholarly journals Generation-3 Polyamidoamine Dendrimer-Silica Composite: Preparation and Cd(II) Removal Capacity

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Augustus N. Ebelegi ◽  
Nimibofa Ayawei ◽  
Azibaola K. Inengite ◽  
Donbebe Wankasi
Keyword(s):  
Freundlich Isotherm ◽  
Sorption Process ◽  
Pamam Dendrimer ◽  
Order Model ◽  
Diffusion Kinetic ◽  
Sorption Data ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
Film Layer ◽  
Solution Kinetic

Generation-3 polyamidoamine (PAMAM) dendrimer was implanted on silica to produce a very good adsorbent (G-3 PAMAM-SGA). The composite was characterized and used for the removal of Cd(II) ions from aqueous solution. Kinetic data fit the Lagergren pseudo-second-order model and also follow the intraparticle diffusion kinetic model to an extent, which is an indication that the sorption process is controlled by both mechanisms: intraparticle/film layer and adsorption inside the pores/crevices of the composite. Equilibrium sorption data of Cd(II) on G-3 PAMAM-SGA fit the Freundlich isotherm (R2 = 0.9993) which is indicative of multilayered adsorption that occurred on heterogeneous surfaces. The ΔG° values for all temperatures studied were negative, which indicated a spontaneous and feasible process. The result implies that G-3 PAMAM-SGA is a promising adsorbent for microscale scavenging of Cd(II) ions in aqueous solutions.

scholarly journals Potassium Recovery from Potassium Solution and Seawater Using Different Adsorbents

2021 ◽  
Vol 11 (18) ◽  
pp. 8660
Author(s):  
Sora Shin ◽  
EunHea Jho ◽  
HyunJu Park ◽  
Sungjong Lee ◽  
JoonHa Kim
Keyword(s):  
Sorption Capacity ◽  
Natural Zeolite ◽  
Ammonium Acetate ◽  
Manganese Nodule ◽  
Freundlich Isotherm ◽  
Significant Loss ◽  
Seawater Samples ◽  
Surface Modified ◽  
Neutral Conditions ◽  
Better Than

The potassium (K) sorption characteristics with three adsorbents, natural zeolite, ammonium acetate-treated zeolite, and manganese nodule, were studied and compared to see the potential use of manganese nodule as an alternative K adsorbent. In general, the Langmuir isotherm could fit the K sorption in the KCl solutions at different pH conditions better than the Freundlich isotherm. Based on the Langmuir parameters, the maximum K sorption was greater for the zeolite-based adsorbents (i.e., 40–42 mg g−1) than the manganese nodule (i.e., 2.0 mg g−1) at acidic conditions, while the manganese nodule (i.e., 9.7 mg g−1) showed better K sorption at neutral conditions. With the seawater samples, the zeolite-based adsorbents showed higher K recovery (4–14%) than the manganese nodule (0–8.8%). The K sorption on the zeolite-based adsorbents followed the pseudo-second-order kinetics and the K sorption rates were higher for the treated zeolite than the natural zeolite. The repeated sorption tests showed that the natural zeolite could potentially be reused up to three times without any significant loss of K sorption capacity, while the ammonium acetate-treated zeolite lost its K sorption capacity after the single sorption test. Overall, the results show that the manganese nodule may potentially be the alternative to zeolite for K recovery under certain conditions, yet the zeolite-based adsorbents are generally better than the manganese nodule. Thus, more studies to enhance the K recovery using zeolite, including surface modified zeolite, are recommended.

scholarly journals Macadamia Nutshell Biochar for Nitrate Removal: Effect of Biochar Preparation and Process Parameters

2019 ◽  
Vol 5 (3) ◽  
pp. 47 ◽  
Author(s):  
Salam Bakly ◽  
Raed A. Al-Juboori ◽  
Les Bowtell
Keyword(s):  
Treatment Time ◽  
Agricultural Waste ◽  
Nitrate Removal ◽  
Waste Product ◽  
Agricultural Practices ◽  
Agricultural Runoff ◽  
Operating Parameters ◽  
Column Experiments ◽  
23 Factorial Design ◽  
Removal Capacity

Agricultural runoff is a major cause of degradation to freshwater sources. Nitrate is of particular interest, due to the abundant use of nitrogen-based fertilizers in agricultural practices globally. This study investigated the nitrate removal of biochar produced from an agricultural waste product, macadamia nutshell (MBC). Kinetic experiments and structural analyses showed that MBC pyrolsed at 900 °C exhibited inferior NO3− removal compared to that pyrolsed at 1000 °C, which was subsequently used in the column experiments. Concentrations of 5, 10 and 15 mg/L, with flowrates of 2, 5 and 10 mL/min, were examined over a 360 min treatment time. Detailed statistical analyses were applied using 23 factorial design. Nitrate removal was significantly affected by flowrate, concentration and their interactions. The highest nitrate removal capacity of 0.11 mg/g MBC was achieved at a NO3− concentration of 15 mg/L and flowrate of 2 mL/min. The more crystalline structure and rough texture of MBC prepared at 1000 °C resulted in higher NO3− removal compared to MBC prepared at 900 °C. The operating parameters with the highest NO3− removal were used to study the removal capacity of the column. Breakthrough and exhaustion times of the column were 25 and 330 min respectively. Approximately 92% of the column bed was saturated after exhaustion.

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