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http://dx.doi.org/10.4491/eer.2016.029

Assessment of kinetics behavior of electrocoagulation process for the removal of suspended solids and metals from synthetic water  

Singh, Hariraj (Department of Environmental Science and Engineering, Indian Institute of Technology (ISM) Dhanbad)
Mishra, Brijesh Kumar (Department of Environmental Science and Engineering, Indian Institute of Technology (ISM) Dhanbad)
Publication Information
Environmental Engineering Research / v.22, no.2, 2017 , pp. 141-148 More about this Journal
Abstract
Globalization, industrialization, mining, and uncontrolled population growth have fostered a shortage of potable water. Therefore, it has become imperative to understand an effective and reasonable water purification technique. A renewed interest in electrocoagulation (EC) has been spurred by the search for reliable, cost-effective, water-treatment processes. This paper has elucidated a technical approach for getting rid of heavy metals and total suspended solids (TSS) from synthetic water using an aluminum electrode. The effect of operational parameters, such as current density, inter-electrode distance, operating time, and pH, were studied and evaluated for maximum efficiency. This study corroborates the correlation between current density and removal efficiency. Neutral pH and a low electrode gap have been found to aid the efficacy of the EC setup. The outcome indicates that a maximum TSS removal efficiency of 76.6% occurred at a current density of $5.3mA/cm^2$ during a contact time of 30 min. In the case of heavy metals remediation, 40 min of process time exhibited extremely reduced rates of 99%, 59.2%, and 82.1%, for Cu, Cr, and Zn, respectively. Moreover, kinetic study has also demonstrated that pollutants removal follows first-and second-order model with current density and EC time being dependent.
Keywords
Current density; Electro-coagulation; Heavy metals; Kinetic; Synthetic water;
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