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iron oxide

Shadi Sawalha's picture

Treatment of Olive Mill Based Wastewater By Means of Magnetic Nanoparticles: Decolourization, Dephenolization and COD Removal

Tue, 2014-11-25 15:35 — Shadi Husni Sawalha

Journal Title, Volume, Page:

Environmental Nanotechnology, Monitoring & Management Available online 16 September 2014

Year of Publication:

2014

Link:

http://www.sciencedirect.com/science/article/pii/S2215153214000087

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada

Laith A. Arar

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine

Nedal N. Marei

Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada

Mahmoud M. Abu Ghanim

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine

Marwan S. Dwekat

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine

Shadi H. Sawalha

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine

[email protected]

Preferred Abstract (Original):

Olive mill wastewater (OMW) is an environmental concern that has been highlighted as a serious environmental problem in the Mediterranean basin countries because of its high organic load and phytotoxic and antibacterial phenolic compounds, which resist biological degradation. Consequently, this type of wastewater represents a huge challenge for the conventional wastewater treatment techniques as it can impact the lifetime of bacteria needed for the treatment. Iron-oxide nanoparticles are attractive for wastewater treatment for two important reasons. First, nanoparticles can remove pollutants from wastewater rapidly. Second, this magnetic type of nanoparticles could be separated easily using a magnet after finishing treatment process. In this study, we aimed at investigating the effectiveness of the magnetic iron oxide nanoparticles in the removal of large organic contaminants from OMW. Batch and continuous mode processes were applied on OMW treatment to determine the effect of contact time, solution pH, coexisting contaminants and the adsorption isotherm.The results showed that the adsorption was fast and the adsorption reached equilibrium within less than 30 min. The adsorption equilibrium data fit very well to the Brunauer–Emmett–Teller (BET) Model, indicating multi-layers adsorption. The adsorption of major pollutants was associated to an efficient removal of coexisting contaminants such as heavy metals and free ions. The adsorption of OMW pollutants was dependent on pH of the solution. Finally, continuous-mode process was tested successfully using a packed bed column that combined sand filtration with magnetic nanoparticles to decolourize OMW effluent. This study will provide valuable insight on the effect of nanoparticles toward the treatment and recyclability of olive mill wastewater, which is crucial for the local olive mill industry. After seeing the successful achievement of integrating nanoparticles with fixed bed filtration, a preliminary process description and cost estimation of stand-alone plant (with a capacity of 4 m3/h) for OMW treatment were considered in this study. Process capital and annual operating costs were estimated to be $12,306 and $476/year, respectively.

nassar's picture

Rapid Removal And Recovery Of Pb(II) From Wastewater By Magnetic Nanoadsorbents

Tue, 2011-05-17 08:12 — Nashaat N. Nassar

Journal Title, Volume, Page:

Journal of Hazardous Materials, 184 (1-3), 538-546

Year of Publication:

2010

Link:

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGF-50W1TM1-8&_user=1...

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

Iron oxide nanoadsorbents are cost-effective adsorbents that provide high adsorption capacity, rapid adsorption rate and simple separation and regeneration. In this study, Fe3O4 nanoadsorbents have been employed for the removal of Pb(II) ions from aqueous solutions by a batch-adsorption technique. The effects of contact time, initial concentration of Pb(II) ions, temperature, solution pH and coexisting ions on the amount of Pb(II) adsorbed have been investigated. Pb(II) adsorption was fast, and equilibrium was achieved within 30 min. The amount of Pb(II) adsorbed increased as temperature increased, suggesting an endothermic adsorption. The optimal pH value for Pb(II) adsorption was around 5.5. Furthermore, the addition of coexisting cations such as Ca2+, Ni2+, Co2+, and Cd2+ has no remarkable influence on Pb(II) removal efficiency. The adsorption equilibrium data fitted very well to Langmuir and Freundlich adsorption isotherm models. The thermodynamics of Pb(II) adsorption onto the Fe3O4 nanoadsorbents indicated that the adsorption was spontaneous, endothermic and physical in nature. The desorption and regeneration studies have proven that Fe3O4 nanoadsorbents can be employed repeatedly without impacting its adsorption capacity.

nassar's picture

Kinetic, Mechanistic, Equilibrium And Thermodynamic Studies On The Adsorption Of Acid Red Dye From Wastewater By Fe2O3 Nanoadsorbents

Thu, 2010-05-27 10:00 — Nashaat N. Nassar

Journal Title, Volume, Page:

Separation Science And Technology Volume 45, Issue 8, 1-12, 2010

Year of Publication:

2010

Link:

http://www.informaworld.com/smpp/content~db=all~content=a921994369~frm=titlelink

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine

Preferred Abstract (Original):

The presence of dyestuffs in wastewater poses an environmental concern since these organic contaminants are toxic to aquatic and non-aquatic life. In addition, these contaminants are difficult to remove or biodegrade, which poses a challenge to the conventional wastewater treatment techniques. In this work, the adsorption of acid red dye 27 (AR27) onto γ-Fe₂O₃ nanoadsorbents was studied for the removal of red dye from aqueous solutions by the batch-adsorption technique. The experiments were carried out at different conditions of contact time, initial AR27 concentration, temperature, co-existing ions, and solution pH. It was found that the adsorption was a rapid process, and equilibrium was achieved in less than 4 minutes. The removal of AR27 decreased with the increase in solution pH and temperature. Furthermore, the addition of chloride and nitrate anions has no remarkable influence on AR27 removal efficiency. On the other hand, the effects of sulfate and bicarbonate anions on the removal of AR27 were significant. The adsorption equilibrium data fitted very well using Langmuir and Freundlich adsorption isotherm models. The data obtained from adsorption isotherms at different temperatures were used to calculate thermodynamic quantities of adsorption, such as standard Gibbs free energy change, enthalpy change , and entropy change . The adsorption process was found to be spontaneous, exothermic and physical in nature. The results indicate that γ-Fe₂O₃ nanoadsorbents could be employed for the removal of dyes from wastewater.