Black and odorous water bodies in urban areas represent a highly concerning water environmental issue that has garnered significant public attention. Direct discharge of untreated such water into major water systems would adversely impact urban image and human health. How should this issue be addressed? Where should we begin? These are critical questions that demand our consideration. This paper aims to elaborate on the background of Water Quality Monitoring for black and odorous water bodies.

The anecdotal call for mayors to swim in urban rivers in some cities reflects the strong public aspiration for resolving the black and odorous water problem. Against this backdrop, it is imperative to clarify the action plan for water pollution prevention and control. Led by officials from the Ministry of Housing and Urban-Rural Development, collaborative efforts with the Ministry of Water Resources, Ministry of Agriculture, and Ministry of Environmental Protection are required to guide local authorities in implementing relevant measures, thereby achieving the goal of eliminating black and odorous water bodies.

For Online Water Quality Monitoring of black and odorous water bodies, what are the key monitoring parameters? Common core parameters include Chemical Oxygen Demand (COD), ammonia nitrogen, dissolved oxygen (DO), total phosphorus (TP), and transparency. Notably, these conventional indicators are widely adopted in wastewater monitoring across various industries.

It is also essential to understand the instruments used for monitoring these parameters. A single Water Quality Detector cannot simultaneously monitor all parameters; instead, monitoring is conducted on a single-parameter basis, with one device dedicated to each parameter. Furthermore, the instruments employed for different parameters are not identical and must be differentiated—each instrument is designed to detect a specific parameter.