| Title |
Sensor State Isolation for Wastewater Based on Influent Characteristics Methodology |
| Authors |
백지원 ( Baek Jiwon ) ; 김종락 ( Kim Jongrack ) ; 유광태 ( You Kwangtae ) ; 김예진 ( Kim Yejin ) |
| DOI |
https://doi.org/10.15681/KSWE.2024.40.4.168 |
| Keywords |
Fault detection; Harmony search algorithm; Influent characteristics; Optical measurement sensor; Wastewater treatment |
| Abstract |
Wastewater treatment plants are constantly exposed to influent wastewater that is constantly changing. This poses a major challenge to the operation of the plants. It is crucial to have a rapid and accurate measurement of the influent concentrations of wastewater in order to maintain and optimize treatment performance, as well as to develop energy-saving strategies. While laboratory measurements provide the highest accuracy in determining influent water quality, they are inevitably time-consuming procedures. In order to cope with the ongoing disturbances from wastewater influent, absorption-based optical measuring instruments have been developed. These instruments can detect the influent water quality in a short amount of time, improving their practicality and reliability. However, when these optical measuring instruments malfunction, the accuracy of the measured values decreases, leading to unreasonable operation of the treatment plant. This paper proposes a method for detecting anomalies in optical water quality measurement devices. The Harmony Search algorithm is used to validate the measured water quality values and detect abnormalities such as contamination or physical anomalies in the measurement apparatus. To assess the performance of the developed algorithm in detecting anomalies, validation was conducted by installing it in a field-scale wastewater treatment plant. The results consistently showed that the developed fault detection method for optical water quality measurements equipment provided acceptable results for normal, temporary abnormal, and long-term abnormal conditions. |