Batch elimination of cationic dye from aqueous solution by electrocoagulation process

Abstract

<jats:p>Like other developing countries, Morocco has undergone a real industrial revolution that generates a huge amount of colored wastewater. Methylene blue (MB) could be considered as commonly model of cationic dyes that are widely used in industries. In the present work, the removal of MB was investigated in the presence of NaCl as electrolyte by electrocoagulation (EC) process. Parameters studied are the nature of electrodes, electrode spacing, initial dye concentration, agitation speed, applied current density, NaCl concentration, and the effect of the initial pH. Stainless steel electrodes have been used as cathode and anode in the electrochemical cell. The performance of the process was evaluated in terms of color removal, chemical oxygen demand (COD), total organic carbon (TOC), electrical power consumption, current efficiency, and the quantity of sludge formed. The results showed that the removal percent of 20 mg/L MB is 100 %, using stainless steel electrodes with an interspace of 1.5 cm and 20 mA/cm² for 6 min in the presence of 0.1 M NaCl at natural pH. COD and TOC removals within 15 min were 45% and 51% respectively. The power consumption, in that case, was 5.84 KWh/m3, while the amount of sludge formed was 1.64 Kg/m3.</jats:p>

The simultaneous removal of reactive and disperse dyes by Electrocoagulation Process with a bipolar connection of combined Iron and Aluminum electrodes: Experimental design and Kinetic studies

“…Sodium and chlorine are provided by the NaCl salt used to vary the conductivity of the solution during experience as shown in Figure 13 EDAX analysis affirms the presence of different metallic elements such as Na and S, the presence of those heavy metals reflects the power of Electrocoagulation process to transfer the pollution from water to the formed sludge. As reported by Titchou et al 30…”

Electrochemical treatment of dye wastewater using nickel foam electrode

“…Presence of OClions in wastewater enhances the formation of nickel hydroxide. Increase in the quantity of the supporting electrolyte results in producing of larger amount of sludge during the electrocoagulation process [18]. The sludge generated during the experiment was minimal and safely removed in each experiment and disposed.…”

The Combined Implementation of Electrocoagulation and Adsorption Processes for the Treatment of Wastewaters

“…The process's efficiency depends on operational parameters such as the applied current intensity, solution pH and conductivity, inter-electrode distance, electrode material, and configuration. The EC process can be summarized in three successive steps: (i) production of coagulants from the electro-dissolution of the sacrificial anode, (ii) destabilization of the particulate suspension and formation of flocs, and (iii) aggregation of the destabilized particulates and their sedimentation and flotation [24].…”