No abstract

No abstract

No abstract

Electrochemical oxidation of phenol using a Ti/TiO 2 -RuO 2 -IrO 2 anode in the presence of chloride as the supporting electrolyte was investigated. The experiments were performed in an undivided batch reactor. Preliminary investigations showed that only a small fraction of phenol was oxidized by direct electrolysis, while complete degradation of phenol was achieved by indirect electrochemical oxidation using chloride as a supporting electrolyte. The effect of operating parameters such as initial pH, supporting electrolyte concentration, phenol concentration, and charge input was studied using Box-Behnken second order composite experimental design. The effect of current density on COD removal was studied separately. TOC removal and AOX formation were studied for selected conditions. It was found that the formation of chlorinated organic compounds was pronounced at the beginning of electrolysis, but it was reduced to lower levels by extended electrolysis.

This paper presents the results of the electrochemical degradation of cresols for wastewater treatment. The experiments were performed in an electrochemical undivided cell reactor using a Ti/TiO2−RuO2−IrO2 anode. Preliminary experiments were conducted using sodium chloride and sodium sulfate as supporting electrolytes to study the effects on the removal of chemical oxygen demand (COD). Operating variables such as the initial pH, chloride concentration, initial cresol concentration, charge input, and current densities were studied using chloride as the supporting electrolyte for maximum degradation. The current efficiency and energy consumption during the degradation were calculated. The present investigation showed the formation of a higher concentration of adsorbable organic halides at the beginning of electrolysis, but this decreased to lower levels during prolonged electrolysis. The total organic carbon removal values were between 50 and 60% though maximum COD removal values were achieved.