Treatment of colored and real industrial effluents through electrocoagulation using solar energy

Abstract

This study was undertaken to investigate the removal of Acid Orange 2 (sodium 4-[(2E)-2-(2-oxonaphthalen-1-ylidene) hydrazinyl] benzenesulfonate) and Reactive Blue 19 (2-Anthracenesulfonicacid,1-amino-9,10-dihydro-9,10-dioxo-4-[[3-[[2-(sulfooxy) ethyl] sulfonyl] phenyl] amino]-,sodium salt (1:2)) from synthesized and real effluents through electrocoagulation using solar cells for the purpose of improving economic efficiency of the process. The impact of a number of key operating parameters was explored including current density, anode type, temperature, pH, and electrolyte concentration. The current density of 45 Am(-2) proved to be the optimum level for both dyes. The same optimum alternatives were found for the other parameters in both cases: iron anode, a temperature level of 25°C, a pH of 7, and an electrolyte concentration of 15 mg L(-1). Both effluent samples were subjected to COD (chemical oxygen demand) and TOC (total organic carbon) tests. Cost analysis was performed for the treatment process.

Advantages of electro-Fenton over electrocoagulation for disinfection of dairy wastewater

“…It seems unreasonable to explain the decay on the basis of the toxicity produced by the electrogenerated H2O2, because this bacteria group, especially the rod-shaped lactobacilli, in presence of O2 already produces certain amount of H2O2 that is chemically and enzymatically transformed into oxygen radicals with more potent antimicrobial activity than H2O2 itself [48,49]. The inactivation of HT and LA bacteria in EF can then be associated to the action of strong oxidizing agents generated, including • OH from Fenton's reaction (4), BDD( • OH) from reaction (7) and active chlorine (Cl2/HClO) from reactions (8) and (9), as established elsewhere [50,51]. These strong oxidants are expected to attack the molecules of the cell walls causing the lysis and death of bacteria [24,52].…”

“…Electrocoagulation (EC) and Fenton-based treatments seem the most promising technologies to remove the bacteria and organic matter from dairy wastewater [5,6]. EC is an efficient, environmentally friendly phase-separation method based on the release of Fe 2+ or Al 3+ ions from sacrificial Fe and Al anodes [7][8][9][10]. Reaction (1) causes the dissolution of the Fe anode.…”

Optimization of Copper Removal by Photovoltaic Electrocoagulation from Aqueous Solution Using Response Surface Methodology Towards Sustainable Development

“…Alternatively, the coupling of these two technologies, electrocoagulation and PV with battery storage can provide a useful system and show many advantages, such as no requirement to be connected to an electric grid [Montiel et al, 2018] and low carbon emissions [Üçtuğ and Azapagic, 2018]. The research of Pirkarami et al illustrated the removal of organic compounds: acid orange 2, reactive blue 19 [Pirkarami et al, 2013], phenol, and aldehydes in the wastewater of a resin factory [Olya and Pirkarami, 2013] with the use of a solar PV -EC with a battery system to save 17% of the total costs.…”

Removal of an anionic reactive dye from aqueous solution using functionalized multi-walled carbon nanotubes: isotherm and kinetic studies

“…Several methods, such as advanced oxidation [7], flocculation [11], photocatalysis [12], electrocoagulation [13], sonolysis [14], and biological processes [15] have been studied for the removal of RB19 from wastewater. Adsorption process is considered to be one of the most effective methods to treat dye-containing wastewater [16][17][18][19][20][21].…”