A Comparative Study for Electrochemical Oxidation of Aromatic Compounds in the Absence and in the Presence of Granular Activated Carbon (GAC)

• Published in: International journal of electrochemical science Vol. 11; no. 3; pp. 2284 - 2296
• Main Authors: Lizhang, Wang, Shengxiang, Yang, Bo, Wu, Zhe’nan, Li, Peng, Li, Yuemin, Zhao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2016
• Subjects: 4,4/-diaminostilbene-2,2/-disulfonic (DSD) acid manufacturing wastewater; Electrochemical oxidation; Granular activated carbon (GAC); Kinetics; Granular activated carbon (GAC); Kinetics; 4,4/-diaminostilbene-2,2/-disulfonic (DSD) acid manufacturing wastewater; Electrochemical oxidation
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)16102-5

Electrochemical oxidation of aromatic compounds existed in 4,4/-diaminostilbene-2,2/-disulfonic (DSD) acid manufacturing wastewater was comparatively performed on PbO2/Ti anode in the absence and in the presence of granular activated carbon (GAC). If less current density is applied across the two systems, the initial zero-order kinetics and the subsequent first-order model should be used for the overall description of chemical oxygen demand (COD) variation. While higher applied current density results in application of the homogeneous first-order model due to the reactions exceed the mass transport limitation. The experimental results illustrate larger current efficiency and lower power consumption could be effectively obtained during DSD wastewater treatment in the presence of GAC, which is of obvious superiority to anodic oxidation without GAC. As a result, the power consumptions of 19.1 and 9.4 kW-h/kg COD as well as COD removal efficiencies of were achieved at reaction time of 5.0 h and 2.5 h in the absence and in the presence of GAC, respectively, which directly confirms the excellent electrode performance of employing GAC as particulate electrode.