Decolorization of a reactive dye solution and treatment of a textile wastewater by electrocoagulation and chemical coagulation: Techno‐economic comparison

Abstract

In this study, the effects of operational parameters such as initial pH, current density, electrolysis time, and initial dye concentrations on the decolorization of Reactive Yellow 135 (RY 135) solutions and the treatment of a textile wastewater by electrocoagulation (EC) with aluminum electrodes were investigated separately. Total organic carbon (TOC) and dye removal ratios were used to measure the treatment efficiency. Energy and electrode consumptions were calculated per m3 of dye solution and per kg of pollutant removed. Amount of sludge produced after EC was also reported per m3 of dye solution. For a complete technical analysis, chemical coagulation experiments with aluminum salts were also carried out. Different direct and indirect cost items including energy, sacrificial electrodes, labor, sludge handling and disposal, maintenance, and depreciation costs have been considered in the calculation of the total operating cost. Under the optimum parameters found in this study, 0.23 $/m3 of total operating cost was acquired with 81% of COD, 85% of TOC, 93.7% of turbidity, and 97.1% of TSS removal efficiencies in treatment of the textile wastewater with EC. 0.11 kWh/m3 of energy and 0.03 kg/m3 of aluminum were consumed while 0.15 kg/m3 of sludge were produced in the process. © 2011 American Institute of Chemical Engineers Environ Prog, 2011

Electrocoagulation-Adsorption to Remove Anionic and Cationic Dyes from Aqueous Solution by PV-Energy

“…Due to the large variability in the composition of textile wastewater, most conventional methods are expensive and are now becoming inadequate. Thus, there is an urgent need to develop more efficient and cost-effective techniques for the treatment of wastewater [12]. A combination of various techniques for the treatment of effluents can lead to higher removal efficiencies than a single treatment method.…”

Preparation, Characterization and Application of Mg(OH)2-PAM Inorganic-Organic Composite Polymer in Removing Reactive Dye

“…To investigate the kinetics of dye removal, the rate constants of dye removal with respect to different initial dye concentrations are described by pseudo-kinetics model [11]. The dye removal rate is represented by:…”

“…The rate constant of the dye removal is strongly depending on the initial dye concentration where the rate constants decrease with the initial dye concentration. This is due to the decrease in activity of dye molecules as the dye molecule has consumed the MHPAM composite polymer during the process of interaction among themselves [11]. …”

Sono-electrocoagulation of wastewater polluted with Rhodamine 6G

“…Furthermore, dye effluent may contain chemicals, which are toxic, carcinogenic, mutagenic, or teratogenic for various microbiologic, fish species. The wastewaters are characterised by an intense colour, a high level of dissolved oxygen demand, dissolved solids, and a highly fluctuating pH [2]. In this study, Rhodamine 6G (R6G) (Fig.…”