Improvement of the Performance of an Electrocoagulation Process System Using Fuzzy Control of pH

Abstract

The removal efficiencies of electrocoagulation (EC) systems are highly dependent on the initial value of pH. If an EC system has an acidic influent, the pH of the effluent increases during the treatment process; conversely, if such a system has an alkaline influent, the pH of the effluent decreases during the treatment process. Thus, changes in the pH of the wastewater affect the efficiency of the EC process. In this study, we investigated the dynamic effects of pH. To evaluate approaches for preventing increases in the pH of the system, the MATLAB/Simulink program was used to develop and evaluate an on-line computer-based system for pH control. The aim of this work was to study Proportional-Integral-Derivative (PID) control and fuzzy control of the pH of a real textile wastewater purification process using EC. The performances and dynamic behaviors of these two control systems were evaluated based on determinations of COD, colour, and turbidity removal efficiencies.

In‐Operando Mapping of pH Distribution in Electrochemical Processes

“…reported that an interfacial pH gradient occurred near the electrode‐solution interface during the reduction of dissolved oxygen and governed the overall process by disturbing the electrochemical equilibrium as a result of the production of hydroxide ions . Previous studies have reported that the interfacial pH could initiate or direct physical or chemical processes, including precipitation, coprecipitation, corrosion, electrodeposition, electrocatalysis, electrocoagulation and electro‐Fenton oxidation . Thus, new insights into the evolution of interfacial pH gradients in operating electrochemical cells are necessary to design and control these processes for a wide range of applications.…”

Design, Construction and Evaluation of a 3D Printed Electrochemical Flow Cell for the Synthesis of Magnetite Nanoparticles

“…The ability to transform Fe 2+ into magnetite is strongly influenced by the distribution of the reactive species in the medium. In electrocoagulation systems for water treatment, MP-P configurations have been also found to be the most efficient 34 due to their better current distribution between electrodes and the fact that pollutant removal efficiency, for electrocoagulation processes, is directly influenced by the production uniformity of the dissolving metal. 16 These results also support the current distributions shown in the FEM simulations and the known relation between a homogeneous current distribution and better cell performance.…”

In‐Operando Mapping of pH Distribution in Electrochemical Processes

“…reported that an interfacial pH gradient occurred near the electrode‐solution interface during the reduction of dissolved oxygen and governed the overall process by disturbing the electrochemical equilibrium as a result of the production of hydroxide ions . Previous studies have reported that the interfacial pH could initiate or direct physical or chemical processes, including precipitation, coprecipitation, corrosion, electrodeposition, electrocatalysis, electrocoagulation and electro‐Fenton oxidation . Thus, new insights into the evolution of interfacial pH gradients in operating electrochemical cells are necessary to design and control these processes for a wide range of applications.…”