This project uses the Internet of Things (IoT) technology combined with the miniaturization of sensors to achieve a wide range of intelligent monitoring sensors, and then transmits on-site information to the cloud system through sensing equipment, integrates water quality monitoring big data for analysis, and conducts real-time data through the information system. Achieve real-time pollution warning work to reduce the harm of external water pollutants to the river water environment, reduce the overall impact level, and create an "intelligent river" with innovative thinking. The "111 Yunlin County Water Quality Sensor Joint Application Project " is specially formulated to promote and implement related work. This project completes the installation and connection of 10 monitoring sensors, which are used in environmental audits, water quality sensitive areas and pollution discharge hot spot identification, and site selection changes are carried out according to the needs of the situation. During the execution of the project, patrol inspection and maintenance work is carried out at least once every two weeks. The results of the offset analysis are almost all within the error range. The correlation coefficient (R2) shows that cleaning and calibration can improve the accuracy. It shows that the frequency of calibration once every two weeks can meet the sensing requirements. In the data value-added analysis part, the overall data reception rate reached 97%, and the data integrity rate reached 95%. 66 abnormal events occurred during the implementation period, including: temperature abnormality, EC abnormality, voltage abnormality, value abnormality (0 or no movement), failure of solar panels to charge, equipment interruption, equipment overturning, equipment flooding... etc.. In addition, the sensor abnormality cannot be ruled out and sent back to the original manufacturer for repair. A total of 9 units were sent for repair 18 times. Reasons for sending in repairs include MCU burnt, disconnection that cannot be ruled out, values stuck or abnormal (displaying 0), water seepage caused by heavy rain, inability to connect to the calibration software, etc. During the implementation period, one water pollution audit report case was completed. On May 17th, LINE "Yunlin Water Quality Sensor Abnormal Report Group" issued a WQIOT water quality report that the pH>9 of the complaint case in Douliu Industrial Park was abnormal. After it was confirmed that the water quality was abnormal, a notification operation was carried out immediately. Subsequently, the personnel of the Douliu Industrial Park Service Center and the Industrial Park Wastewater Plant were traced to the source of the pollution, and it was confirmed that the wastewater of ○○ Company was discharged from the rainwater channel. In addition, 2 environmental application cases were completed during the execution period, including the case of complaint in Douliu Industrial Park and the abnormal water quality of Maguang Bridge in Magongcuo Drain. In the case of Douliu Industrial Park, pH abnormality occurred again on August 4, and the holiday EC abnormality occurred in Maguang Bridge, Magongcuo Drain, on September 18. Both of them have not yet found their specific pollution period and pollution source, and they are currently under continuous observing. The work progress of the project has reached 100%, which meets the requirements of the contract.

Water quality sensor, Internet of Things (IoT), Environmental monitoring