Performance Comparison of a Self-Cleaning and a Conventional pH Electrode in Wastewater Process Monitoring

Abraham de Guzman, Elyson Keith Encarnacion

Abstract

Accurate pH measurement is vital in wastewater treatment for effective process control and regulatory compliance. This study compares a self-cleaning pH sensor (HORIBA 6122 series) with a conventional glass electrode, installed in parallel at a wastewater treatment facility in Metro Manila, Philippines. Over a 97-day period, 2,324 paired readings were recorded. Statistical analysis revealed a significant difference (t(2323) = 56.88, p > 0.05) in mean values (HORIBA = 6.93, conventional = 6.12). The HORIBA sensor exhibited lower variability (HORIBA = 0.2335, conventional = 0.6461) through time, indicating better stability. These results align with the goals of Process Analytical Technology and support the deployment of self-cleaning sensors for real-time wastewater treatment monitoring.

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IMEKO-TC8-11-24-2025-042.pdf

DOI

10.21014/tc24-2025.042

IMEKO TC

TC24 - Chemical Measurements

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