Evaluation of Energy Consumption in Electrochemical Oxidation of Acid Violet 7 Textile Dye using Pt/Ir Electrodes

Abstract

Abstract:The effects of processing parameters were investigated on the electrochemical oxidation of textile dyeing wastewater containing Acid Violet 7 (AV7) at Pt/Ir electrodes in the presence of 75% NaCl + 25% Na2CO3 (w/w) supporting electrolyte mixture in a batch electrochemical reactor. Experimental parameters were operated in the range of 300-1500 mg/L textile dye concentration, 4-20 g/L electrolyte concentration, 5-15 mA/cm 2 current density, and 20-60 °C reaction temperature. Energy consumption decreased with increasing textile dye concentration and electrolyte concentration, and decreasing the current density. In the study, energy consumption values were evaluated for textile dye decolorization (t=15 min) and chemical oxygen demand (COD) removal (t=120 min) as 2.7-23.3 kWh/kg dye decolorization and 50.9-317.9 kWh/kg COD removal, respectively.

Carbon and energy footprint of electrochemical vinegar wastewater treatment

“…Despite the popularity of electrochemical treatment of wastewaters, the focus on the energy cost was limited to the economical aspects of the overall treatment [4][5][6][7]. Unfortunately, the economic cost of energy production (and consumption, thereof) is not directly compatible with the environmental impact of the direct and indirect wastes.…”

“…Besides, several researchers have attacked the problem of energy efficiency for different wastewater types [5][6][7]. A distinct novelty of the proposed research here (as opposed to the parametric optimization approaches of the described literature survey) is the assessment of the overall electrochemical treatment process with a common denominator of oxygen demand (or carbon emission, thereof).…”

“…Again, the consumed energy was not set at an equivalent oxygen demand figure to assess the overall efficiency. It was observed that the oxygen demand equivalent of the consumed electrical energy was not stated as an issue in other types of electrochemical wastewater treatment applications, either [5][6][7]. In [6,7], very detailed analyses regarding the monetary costs of the plant installations and treatment runs were achieved for various cost parameters, including the electrical energy.…”

“…Unlike conventional papers which report the energy consumption in terms of the utilized kWh of electrical energy [2][3][4][5][6][7], this work converts the energy to the production level oxygen demand. The conversion is performed via averaging electric production plants throughout the country in terms of their CO2 emissions, and then by calculating the oxygen part of the required emission from the atomic mass ratios.…”

Photovoltaic Energy-Assisted Electrocoagulation of a Synthetic Textile Effluent

“…Due to their high molecular weights, complex structures, and especially high solubility in water, dyes persist once discharged into a natural environment, for example, textile [1,2], pharmaceutical [3], cosmetics and food industry [4], and industrial wastewater [5]. Specifically for the textile industry, the chemical structure of these compounds is complex, generally of the type azo [6][7][8]. This group consists of colored substances with a complex chemical structure (many functional groups) and a high molecular weight.…”