A parametric comparative study of electrocoagulation and coagulation using ultrafine quartz suspensions

Date

2009-11-15

Author

Kilic, Mehtap Guelsuen
Hosten, Cetin
Demirci, Şahinde

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

155
views

0
downloads

This paper attempts to compare electrocoagulation using aluminum anodes and stainless steel cathodes with conventional coagulation by aluminum sulfate dosing on aqueous suspensions of ultrafine quartz. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of turbidity removal from ultrafine quartz suspensions. The parameters investigated in the study were suspension pH, electrical potential, current density, electrocoagulation time, and aluminum dosage. A comparison between electrocoagulation and coagulation was made on the basis of total dissolved aluminum, revealing that electrocoagulation and coagulation were equally effective at the same aluminum dosage for the removal of quartz particles from suspensions. Coagulation, however, was more effective in a wider pH range (pH 6-9) than electrocoagulation which yielded optimum effectiveness in a relatively narrower pH range around 9. where, in both methods, these pH values corresponded to near-zero zeta potentials of quartz particles. Furthermore, experimental results confirmed that electrocoagulation could display some pH buffering capacity. The kinetics of electrocoagulation was very fast (<10 min) in approaching a residual turbidity, which could be modeled with a second-order rate equation.

Subject Keywords

Turbidity, Quartz, Zeta potential, Coagulation, Electrocoagulation

URI

https://hdl.handle.net/11511/47154

Journal

JOURNAL OF HAZARDOUS MATERIALS

DOI

https://doi.org/10.1016/j.jhazmat.2009.05.133

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

A comparative study of electrocoagulation and coagulation of aqueous suspensions of kaolinite powders Kilic, Mehtap Guelsuen; Hoşten, Çetin (2010-04-15) Removal of kaolinite particles from their synthetically prepared suspensions was studied by electrocoagulation and coagulation to investigate the effect of such operating parameters as initial pH, coagulant dosage, applied voltage, current density, and time. Coagulation was more effective in a wider pH range (pH 5-8) than electrocoagulation which yielded optimum effectiveness in a relatively narrower pH range around 9, where, in both methods, these pH values corresponded to near-zero zeta potentials of kaol...
A density functional theory study of oxidation of benzene to phenol by N2O on Fe- and Co-ZSM-5 clusters Fellah, Mehmet Ferdi; Önal, Işık (2009-06-01) Density functional theory (DFT) calculations were carried out in the study of oxidation of benzene to phenol by N2O on relaxed [(SiH3)(4)AlO4M] (where M=Fe, Co) cluster models representing Fe- and Co-ZSM-5 surfaces. The catalytic cycle steps are completed for both Fe-ZSM-5 and Co-ZSM-5 clusters. The general trend of the results that were obtained in terms of activation barriers for the Fe-ZSM-5 cluster is in agreement with the experimental and theoretical literature. It was observed that the phenol formatio...
A novel experimental and density functional theory study on palladium and nitrogen doped few layer graphene surface towards glucose adsorption and electrooxidation Caglar, Aykut; Duzenli, Derya; Önal, Işık; Tezsevin, Ilker; Sahin, Ozlem; Demir Kıvrak, Hilal (Elsevier BV, 2021-03-01) At present, few layer graphene (G) and nitrogen doped few layer graphene (N doped-G) are firstly coated on Cu foil via chemical vapor deposition (CVD) method and G and N doped-G coated Cu foil is transferred to the indium tin oxide (ITO) substrate surface to obtain electrodes. Pd metal is electrodeposited onto the N doped-G/ITO electrode (Pd-N doped-G/ITO). Pd-N doped-G/ITO electrode are characterized with advanced surface characterization methods such as Raman spectroscopy and SEM-EDX. Characterization res...
A Density Functional Theory Study of Direct Oxidation of Benzene to Phenol by N2O on a [FeO](1+)-ZSM-5 Cluster Fellah, Mehmet Ferdi; Önal, Işık; van Santen, Rutger A. (2010-07-29) Density functional theory calculations were carried out in a study of the oxidation of benzene to phenol by N2O on a model (FeO)(1+)-ZSM-5 cluster: the [(SiH3)(4)AlO4(FeO)] cluster. This cluster models the reactivity of Fe3+ oxidic clusters. Results are to be compared with an earlier study (J. Phys. Chem. C 2009, 113, 15307) on a model Fe2+-ZSM-5 cluster. The true activation energies for the elementary reaction step in which phenol is produced appear to be comparable. The major difference between the two sy...
A Molecular Dynamics Study on the Local Structure of Al90Sm10 Marginal Metallic Glass and Liquid Sarıtürk, Doğuhan; Kalay, Yunus Eren (2023-01-01) The liquid and the amorphous Al90Sm10 marginal metallic glassy alloy are investigated using Molecular Dynamics. The Al90Sm10 system consisting of 32,000 atoms is simulated under the constant number of atoms, pressure, and temperature (NPT) ensemble where the temperature and pressure are controlled via Nose–Hoover thermostat and barostat, respectively. The corresponding liquid model is initially held at 2300 K; then, the liquid is continuously cooled down to 300 K with a constant cooling rate of 1010 Ks−1, d...

Citation Formats

M. G. Kilic, C. Hosten, and Ş. Demirci, “A parametric comparative study of electrocoagulation and coagulation using ultrafine quartz suspensions,” JOURNAL OF HAZARDOUS MATERIALS, pp. 247–252, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47154.