Design of a Monitoring and Coordination Setup for an Onsite Electrochemical Production of Sodium Hypochlorite

Abstract

This study presents the design and implementation of a fully automated system for precise sodium hypochlorite dosing, simulating an in situ generation plant. The system integrates a MATLAB-based human-machine interface (HMI) and a control unit connected to an Arduino UNO board, ensuring real-time monitoring and adjustment. An electrochemical method utilizing graphite electrodes and the LMP91000 integrated circuit was developed to determine hypochlorite concentration. Signal conditioning was achieved through digital and analog circuits, interfacing sensors, and actuators with the control system. The system demonstrated reliable detection and dosing performance with a resolution of 2 mg/L for sodium hypochlorite concentrations in the range of 2–12 mg/L, achieving complete dosing within the target concentration range. Experimental results validate the system’s effectiveness in automatically regulating hypochlorite dosing, demonstrating its potential for water disinfection in resource-limited communities. A detailed calibration procedure is also provided to ensure operational reliability and accuracy.