Design of an Online COD Detection System for Water Quality

In response to the issues of low detection accuracy and inconvenient manual sampling associated with traditional water quality COD detectors, this paper presents the design of an online automatic detection system for chemical oxygen demand (COD) in water quality using rapid digestion spectrophotometry.The system is centered around the STM32F407 microcontroller, based on the Cortex M4 core.It is capable of automatically detecting COD content in water samples and communicating data.It can detect water quality status in real-time and help relevant departments obtain water quality information in real-time to prevent water pollution accidents.The test results show that the system has successfully performed various functions for online detection of COD in water quality.The error in COD detection indication within the range of 15 mg/L to 2000 mg/L is less than ± 5%, meeting the technical requirements of relevant standards.It has good application prospects and practical value.