Optimization of parameters of electrocoagulation/flotation process for removal of Acid Red 14 with mesh stainless steel electrodes

Abstract

Dyes are persistent compounds that are not easily biodegraded and are considered as carcinogenic.Electro-coagulation and electro-flotation method, due to its adaptability and compatibility with the environment, is regarded as one of the appropriate methods for the treatment of industrial wastewater containing dye. In this study in which stainless steel mesh electrodes with a horizontal arrangement are used, the most important parameters affecting the performance of the simultaneous system of electro-coagulation and electro-flotation, including electrodes area, of distance between electrodes, solution's electrical conductivity, type of electrolyte, and initial pH were examined. The effect of every one of these parameters in color removal efficiency of Acid Red 14 from artificial wastewater, energy consumption and anode was determined and their values were optimized. The area of the electrode equals 20.5 cm 2 , the distance between the electrodes is 0.5 cm, electrical conductivity 3,600 μS/cm, and initial pH 7 were selected as the optimum values, and dye removal efficiency of 99% with initial concentration of 150 mg/L and electric current density 40 mA/ cm 2 (0.8 A) were obtained under optimum conditions and within 20 minutes. The advantages of this method are low energy and material consumption, and low sludge production.

Square-Wave Alternating Voltage for Enhancing Cr(VI) Reduction in a Carbon Fiber-Based Flow-Through Electrode System

“…In general, the HCrO 4 – removal and current of the FESs gradually tended to be stable after 150 min. This phenomenon can be attributed to the adsorption of Cr species and formation of gas bubbles in the CFF electrodes, , which both gradually decreased the active areas for the electrochemical redox (current) , and inhibited the HCrO 4 – removal. As the operation time was increased, with the adsorption of Cr species becoming saturated, the gas bubbles were accumulated to certain volumes and moved along the flow direction by the flow effect, hence resulting in the dynamic equilibrium between bubble formation and flowing away (SI, Figure S4).…”

Treatment of Textile Dyeing Waste Water Using TiO2/Zn Electrode by Spray Pyrolysis in Electrocoagulation Process

“…Chemical coagulation is efficient for sulfurous and disperse dyes. Acidic, direct, vat and reactive dyes coagulate with this method too, but do not settle, while cationic dyes do not even coagulate [18]. The conventional treatment methods such as activated sludge, coagulation and flocculation process, reverse osmosis and evaporation consume a lot of chemicals, high energy and are not sufficient to break down azo double bonds of reactive dyes.…”

Evaluation of electrochemical treatment of real hospital wastewater with different electrode materials

“…However, an increase was observed in the conductivity values of Al and Fe electrodes between 0-20 min. In some EC studies, it has been reported that disinfectants or dissolved ions in wastewater may cause an increase in conductivity [21], [22]. Consequently, it is estimated that disinfectants or dissolved ions in HWW may have caused an increase in conductivity.…”