Applicability investigation of piezoelectric sensor-based damage detection technique for membrane

Abstract

The water industry is increasingly using membrane technology for water treatment, wastewater treatment, and water reuse. However, the damage of membrane causes a drop in removal efficiency and threatens downstream use. Thus, the integrity of membrane should be monitored. To detect damage of membrane, this study used piezoelectric sensor-based high-frequency response measurement method which is used in structural health monitoring. The high-frequency responses can monitor the changes in physical properties of host structures. The pressure decay that caused by membrane damage during pressure decay test can be measured by high-frequency response signals measured using piezoelectric sensor. To verify its applicability, a lab-scale test was performed. The electromechanical impedance and guided wave were measured with different membrane conditions, and the variations in signals were quantified using root-mean-square deviation. Also, the support vector machine was used to classify the condition of membrane. According to the results, the proposed method can classify the operation condition and pressure decay of membrane.