Due to rapid development of economy in Taiwan, industrialization and urbanization have brought great pressure on the environment. In particular, industrial pollution has immediate impact on residential areas because the small urban area increases the chances of pollution spreading. The conventional water sensing instruments, such as pH meter and conductivity measurement are reliable. However, frequent manual calibration and cleaning are usually required, thus the manpower demand for maintenance is heavy. Also, monitoring instruments for regulatory items related to enforcement, such as heavy metals and chemical oxygen demand have the disadvantages of large volume and high installation cost. Therefore, the conventional water sensing instruments are not suitable for application scenarios on mass installation and distribution. The project plan to achieve the following results: 1. Miniaturized water quality sensing components for pH, temperature, conductivity, chemical oxygen demand (COD), suspended solids (SS) and heavy metals by utilizing optical and electrochemical methods are developed. A small automated water quality monitoring system for the detection of pH, conductivity, SS, COD and heavy metal featuring compact, durable, easy maintenance and low cost is also developed by integrating microfluidic systems, chemical analysis, optical detection and signal processing circuits. 2. In year 107, 100 sets of the automated water quality monitoring system have been installed at several sites of Taoyuan City, including part of Nankan creek River Basin, Guishan Industrial park and Hangzikou irrigation ditch. The systems have been operated continuously over 60 days and achieved over 96 % of complete transmission of water quality monitoring data. In year 108, the project plan to extend its application field, to install 50 sets of the automated water quality monitoring system in Taoyuan, Hsinchu or Yunlin. 3. The water quality IoT wireless communication module and data center system has been established and operated online. Combining the established deployment and maintenance management system and water quality sensing data analysis and decision-making system, the platform can issue immediate alert after detection of potential pollution area, in order to provide traceability and early warning.

Environmental water quality, Pollution monitoring, Environmental forensic investigation, IoT, sensor network