engleski

Electrocoagulation in aqueous dispersions

A renewed interest in electrocoagulation has been initiated by the search for cost-effective wastewater treatment processes. Electrocoagulation is a combination of the processes of electroflotation and electroprecipitation, involving the electrolytic addition of coagulating metal ions directly into water from sacrificial electrodes. Such process has shown a number of advantages over their addition chemically, meaning no addition of undesired anions, less produced sludge volume and possibility of removing the wider range of pollutants. The objective in this work was to quantitatively compare conventional chemical dosing and electrocoagulation applied on printing ink wastewater. The two approaches based on TOC and turbidity removal were evaluated by monitoring pH, conductivity, zeta potential, coagulant level/current density and voltage in order to investigate how the process efficiency is dependent on current density, conductivity and pH. The dominant separation process, coagulant consumption and power consumption were determined. Another objective was to investigate the possibility of improvement of electrocoagulation by combination with Fenton oxidation in order to minimize the organic content in water.

electrocoagulation; printing ink wastewater; Fenton; oxidation

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