Decolorization and COD removal from real textile wastewater by chemical and electrochemical Fenton processes: a comparative study

Abstract

BackgroundDue to the presence of non-biodegradable and toxic compounds, textile wastewater is difficult to treat by conventional methods. In the present study, Electrochemical Fenton (EF) and Chemical Fenton (CF) processes were studied and compared for the treatment of real textile wastewater. The effects of electrical current, ferrous ion, hydrogen peroxide concentration and reaction time on the removal efficiencies of COD and color were investigated. All the experiments were carried out at pH = 3.ResultsBoth EF and CF processes were mostly efficient within hydrogen peroxide concentration of 1978 mg/L (H2O2: COD ~ 1.1). The highest COD and color removal efficiencies were 70.6% and 72.9% respectively which were obtained through the EF process in 350 mA electrical current, 1978 mg/L hydrogen peroxide and 60 minutes reaction time. Furthermore, the operational costs of EF and CF processes were 17.56 and 8.6 US$ per kilogram of the removed COD respectively.ConclusionIt was concluded that the electrochemical Fenton process was more efficient than the chemical Fenton process in the degradation of textile wastewater. Likewise, Although EF process imposed higher operational costs than the CF; it dramatically decreased the reaction time to gain the highest degradation efficiency.

Application of response surface method for coagulation process in leachate treatment as pretreatment for Fenton process: Biodegradability improvement

“…The Fenton experiments were carried out in a 500 mL glass vessel filled with 200 mL coagulation undergone effluent. The pH was set at 3.0 (ideal pH for Fenton process) by sulfuric acid [15,16]. Ferrous dosage at appropriate quantity was added to the solution.…”

“…In Fenton process, H 2 O 2 reacts with Fe 2+ , resulting in the generation of hydroxyl radical and ferric ion according to Eq. (1) [14][15][16]:…”

Electrocoagulation/Flotation of Textile Wastewater with Simultaneous Application of Aluminum and Iron as Anode

“…Energy consumption is a crucial factor in all electrochemical processes including ECF being associated with operating cost of the process (Emamjomeh and Sivakumar 2009;Eslami et al 2013). Electrical current correlates with the electrical energy consumption.…”

Dosificación mínima del reactivo Fenton para la remediación de agua contaminada con colorantes

“…En la industria textil, se han reportado consumos anuales de alrededor de 7x10 5 ton de colorantes y consumos de agua de hasta 150 L por cada kg de producto textil (Körbahti y Tanyolaç, 2008;Eslami, A., Moradi, M., Ghanbari, F., & Mehdipour, F., 2013;Garcés y Hernández, 2012;Bouasla, 2012;Bahmami, Rezaei, Esrafili, Gholami y Jonidi, 2013). Se estima que de la cantidad utilizada de colorantes en la industria textil, aproximadamente se desperdicia hasta un 15% de colorantes en efluentes (Daud, Akpan, y Hameed, 2012;Cui, Li, Zhao y Han, 2014); en Malasia el 22% del volumen total de aguas residuales corresponde a la industria textil (Daud, Akpan, y Hameed, 2012).…”