Development and long-term technical validation of an automated bioelectrochemical system for online BOD monitoring of wastewater hydrolysis acidification effluent.
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75% confidenceThis study developed an automated bioelectrochemical system for online BOD monitoring of wastewater hydrolysis acidification effluent, achieving a detection range of 12.8-172.8 mg l⁻¹ BOD with high accuracy. The system demonstrated long-term stability and robustness in real-time BOD monitoring. It can provide data support for optimizing wastewater treatment processes and evaluating water environmental quality.
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Abstract
Real-time monitoring of biochemical oxygen demand (BOD) is crucial for optimizing wastewater treatment processes and evaluating water environmental quality. This study developed an integrated online BOD monitoring system based on bioelectrochemical system (BES) technology. Through automated process design and parameter optimization, the system achieved a detection range of 12.8-172.8 mg l -1 BOD (R²=0.995). Long-term stability assessment revealed that despite biosensor performance degradation during continuous measurements, the system maintained high accuracy (relative error <1.1%) through a baseline recalibration strategy implemented every 100 measurements. Field validation for the hydrolysis acidification tank (HAT) effluent demonstrated the capability of the system to monitor dynamic BOD variations and respond rapidly to process manipulation such as carbon source addition. By establishing a correction model specifically for the HAT effluent samples, the system achieved a relative measurement error of 6.73%. The results demonstrate the robustness of the developed system in long-term real-time BOD monitoring of HAT effluent, which may provide data support for downstream process regulation.