Core application scenarios and value of COD sensors in environmental monitoring
As a key device for measuring organic pollution in water bodies, COD sensors provide technical support for pollution prevention and control, water quality management and ecological protection through real-time and accurate chemical oxygen demand (COD) data collection in environmental monitoring. The following is an explanation from the monitoring objects, functions and typical scenarios.
Natural water pollution monitoring and early warning
Long-term monitoring of surface water
Deployed in rivers, lakes, reservoirs and other water bodies, it continuously monitors COD value changes to reflect the dynamic trend of water bodies being polluted by organic matter. For example, when the sensor detects a sudden increase in COD concentration (such as exceeding the regional water quality standard limit), it can trigger an early warning, indicating that there may be problems such as industrial illegal discharge and direct discharge of domestic sewage, helping environmental protection departments to quickly locate the source of pollution and take interception measures.
Water source protection
Install COD sensors in drinking water source protection areas (such as reservoirs and upstream rivers) to monitor the COD content of incoming water in real time. Once the water quality exceeds the standard, the system automatically alarms to ensure water supply safety. For example, a water source can timely discover the increase in COD caused by agricultural non-point source pollution through sensor data, and reduce the pollution risk by adjusting the surrounding planting structure.
Pollution source emission supervision and control
Industrial wastewater emission monitoring
For key polluting industries such as chemical, pharmaceutical, and papermaking, COD sensors are installed at the wastewater discharge outlet to monitor the emission concentration in real time, and the valve can be linked to automatically cut off the emission or notify the enterprise to rectify, so as to prevent pollutants from directly entering the natural water body.
Sewage treatment plant compliance supervision
Online monitoring of the COD values of the sewage treatment plant inlet and outlet to evaluate the efficiency of the treatment process. For example, when the effluent COD is close to the emission standard threshold, the sensor data can guide the operator to adjust the process parameters such as aeration and sedimentation to ensure that the emission meets the standard and reduce the impact on the receiving water body.
Emergency response to sudden pollution incidents
Rapid pollution assessment
In sudden water pollution incidents (such as chemical leaks and oil spills from ships), portable COD sensors can be quickly deployed in the polluted area to track the changes in COD values in real time and evaluate the scope and extent of pollution spread.
Emergency treatment effect verification
During the pollution treatment process, the COD sensor is used to continuously monitor the recovery of the water body. For example, after using activated carbon to absorb pollution, the sensor data can verify whether the COD value has dropped to a safe level, providing a basis for emergency termination decisions.
Environmental policy implementation and data support
Water quality assessment and law enforcement basis
The COD data collected by the sensor can be used as a quantitative indicator for local government water environment quality assessment, and at the same time provide objective evidence for environmental law enforcement. For example, a certain region confirmed that a certain enterprise had long-term excessive emissions through continuous COD monitoring data, and imposed a fine on it and ordered it to suspend production and rectify according to law.
Ecological restoration effect evaluation
In projects such as lake eutrophication control and river ecological restoration, the long-term monitoring data of COD sensors can reflect the actual effects of control measures (such as dredging and ecological floating island construction) and provide a reference for the optimization of subsequent restoration plans.
Application advantages summary
In environmental monitoring, COD sensors solve the problems of low efficiency and data lag of traditional manual sampling through real-time, automation, and high precision, and realize the transformation from "passive response" to "active prevention and control". It is an important technical means of the modern environmental management system.