The digital dissolved oxygen sensor is widely used in scenarios that require real-time monitoring of dissolved oxygen concentration in water due to its high precision, fast response, strong anti-interference ability, and digital integration advantages. The following are typical application scenarios and specific case analysis:
1、 Aquaculture
Core requirements
Dissolved oxygen is a key parameter for respiration in aquatic organisms such as fish, shrimp, and crabs. Hypoxia can lead to suffocation, death, or growth retardation.
Real time monitoring of dissolved oxygen in different water layers (such as pond bottoms and net cages) is required to avoid local hypoxia.
Application Cases
Factory based circular aquaculture: Multiple sensors are deployed in the aquaculture pool, combined with a PLC control system to automatically adjust the aerator and water flow rate, maintaining dissolved oxygen at 5-8mg/L (suitable range for fish).
Pond aquaculture: Real time data is uploaded to a mobile app through buoy sensors, allowing farmers to remotely monitor changes in dissolved oxygen levels and activate oxygenation equipment in a timely manner during nighttime or rainy days.
High density aquaculture: For example, in shrimp farming, dissolved oxygen levels below 3mg/L can trigger stress reactions, sensors trigger alarms, and the oxygenation system is linked to prevent large-scale mortality.
advantage
Optical sensors require no membrane maintenance to reduce measurement errors caused by algae adhesion or impurity blockage.
Digital output supports integration with IoT platforms to achieve centralized management of multiple ponds.
2、 Wastewater treatment
Core requirements
The biochemical treatment stage (such as activated sludge process, MBR process) requires strict control of dissolved oxygen concentration to ensure the efficiency of microbial degradation of organic matter.
Hypoxia or peroxide can both lead to a decrease in treatment efficiency and an increase in energy consumption.
Application Cases
A ² O process (anaerobic anoxic aerobic): Install sensors in the aerobic tank to monitor dissolved oxygen in real time (usually 2-4mg/L), and adjust the air supply through variable frequency linkage with the blower to optimize energy consumption.
MBR membrane bioreactor: Monitor dissolved oxygen in the membrane tank to prevent sludge deposition on the membrane surface due to hypoxia and extend the membrane's service life.
Industrial wastewater treatment: If pharmaceutical wastewater contains high concentrations of organic matter, it is necessary to control microbial activity through dissolved oxygen to avoid the accumulation of toxic substances.
advantage
Fluorescent sensors have strong resistance to chemical interference and are suitable for industrial wastewater containing sulfides and heavy metal ions.
Digital signal transmission reduces analog signal interference and improves data reliability.
3、 Environmental Monitoring and Ecological Research
Core requirements
Assess the self purification capacity of water bodies, monitor environmental issues such as eutrophication and black and odorous water bodies.
Long term tracking of dissolved oxygen changes and studying the impact of climate change on aquatic ecosystems.
Application Cases
River/Lake Monitoring: Deploy a buoy based sensor network, upload real-time data to the environmental protection department platform, and identify pollution sources (such as direct discharge of sewage causing a sudden drop in dissolved oxygen).
Wetland protection: Monitor dissolved oxygen in wetland water bodies and evaluate the improvement effect of vegetation restoration on water quality.
Ocean observation: Install sensors in nearshore aquaculture areas or coral reef conservation areas to study the correlation between dissolved oxygen and ocean acidification and temperature rise.
advantage
Optical sensors have a fast response speed (in seconds) and are suitable for dynamically monitoring changes in tides, water flow, and other factors.
Low power design supports solar power supply and is suitable for long-term deployment in remote areas.
4、 Industrial Process Control
Food and Beverage Industry
Beer brewing: Dissolved oxygen affects the taste and shelf life of beer. The dissolved oxygen in the fermentation tank should be controlled below 0.1mg/L, and the sensor linked nitrogen filling system should eliminate oxygen.
Drinking water production: Monitor dissolved oxygen in filtration, disinfection, and other processes to ensure that water quality meets standards.
chemical production
Fermentation process: In antibiotic production, dissolved oxygen concentration directly affects bacterial metabolism and product yield, and sensors provide real-time feedback data to optimize oxygen supply strategies.
Wastewater treatment: Monitor dissolved oxygen in chemical wastewater treatment to prevent the generation of toxic substances (such as hydrogen sulfide) due to oxygen deficiency.
advantage
Explosion proof sensors (such as Ex ia IIC T6 Ga certification) are suitable for use in flammable and explosive environments.
High precision measurement supports closed-loop control of process parameters, improving product quality stability.
5、 Research and Education
laboratory study
Ecotoxicology: Study the effects of heavy metals, pesticides, and other pollutants on the dissolved oxygen demand of aquatic organisms.
Microbial Metabolism: Monitor the efficiency of microbial degradation of organic matter under different dissolved oxygen conditions and optimize biological treatment processes.
teaching demonstration
The majors of environmental science and aquaculture in universities use sensors to conduct experiments, visually demonstrating the correlation between dissolved oxygen and water temperature, salinity, and flow rate.
By installing immobilized enzyme membranes, the sensor was transformed into a glucose content analyzer for use in biochemistry teaching.
advantage
The supporting software supports data export and curve analysis, making it easy to write scientific research papers.
Modular design facilitates students' disassembly and learning of sensor principles.
6、 Other emerging applications
Smart City Water Management
Combining GIS maps and big data analysis, construct a thermal map of dissolved oxygen distribution in urban water bodies to assist in decision-making for drainage network renovation or ecological restoration projects.
Extreme environmental monitoring
Deploy pressure resistant and low-temperature sensors in deep-sea, polar and other areas to study the relationship between dissolved oxygen and global climate change.
Agricultural irrigation
Monitor the dissolved oxygen in irrigation water to avoid soil compaction or crop root rot caused by hypoxia (such as maintaining a certain level of dissolved oxygen in rice paddies).