What is BOD online water quality detector?
Release time:2025.11.27
What is BOD online water quality detector?
The following is a detailed introduction to the BOD online water quality analyzer, combined with its definition, principle, function, application scenarios and technical features:
I. Definition and function of BOD online water quality analyzer
BOD (biological oxygen demand) refers to the amount of dissolved oxygen consumed by microorganisms to decompose organic matter in water under specific conditions (usually 20℃ for 5 days) (unit: mg/L), which is the core indicator for measuring the degree of organic pollution in water.
BOD online water quality analyzer can monitor the BOD value in water in real time and continuously, and quickly reflect water quality changes through automated analysis. It is suitable for pollution control and process optimization in sewage treatment plants, industrial wastewater, surface water and other scenarios.
II. Core working principle
Mainstream BOD online analyzers use microbial sensor method or ultraviolet absorption method:
Ultraviolet absorption method
- 1. Utilize the ultraviolet absorption characteristics of organic matter at a wavelength of 254nm to infer the BOD value through spectral analysis.
- 2. Features: No reagent consumption, low maintenance cost, but regular calibration is required to eliminate turbidity interference.
III. Functions and technical parameters
1. Core functions
- Real-time monitoring: supports 24-hour continuous detection, and the measurement interval can be set (such as 10 minutes to several hours).
- Automated operation: automatically completes sampling, pretreatment, measurement and data storage.
- Alarm and control: trigger alarm when exceeding the standard, and link equipment to adjust the processing process (such as aeration system).
- Data management: supports RS485 remote transmission, compatible with SCADA system, built-in storage (≥5 years of historical data).
2. Key technical indicators
- Parameter Typical range Accuracy Response time
- BOD measurement range 0-20000 mg/L (optional in steps) Within ±10% 3-30 minutes
- Detection method Microbial sensor / UV absorption method - -
- Anti-interference ability Automatic compensation for turbidity and temperature effects - -
- Reagent consumption None (microbial method) or low (traditional method) - -
IV. Application scenarios
- 1. Wastewater treatment plant: optimize aeration system to ensure that effluent BOD meets standards and evaluate the activity of activated sludge.
- 2. Industrial wastewater monitoring: chemical, food, pharmaceutical and other industries, real-time monitoring of organic matter concentration at the discharge port.
- 3. Environmental monitoring: long-term monitoring of surface water such as rivers and lakes, and early warning of organic pollution events.
- 4. Emergency response: rapid assessment of water quality impact in sudden pollution (such as oil spills).
V. Advantages
- Timeliness: rapid results (minutes), more timely than laboratory BOD₅ testing (5 days).
- Economical: UV absorption method does not consume reagents, reducing operation and maintenance costs.
- Intelligent: supports automatic calibration and remote control, suitable for unattended scenarios.
VI. Selection recommendations
- 1. Measurement range: Select low range (such as 0-500 mg/L) or high range (such as 0-20000 mg/L) according to needs.
- 2. Detection method: UV absorption method (reagent-free) is preferred.
- 3. Anti-interference ability: For high turbidity scenarios, models with automatic compensation function should be selected.
- 4. Compliance: Confirm that the instrument complies with national or industry standards (such as HJ 505-2009).
VII. Typical cases
- Case 1: A sewage treatment plant uses BOD online instrument to adjust aeration intensity in real time, saving 15% of electricity bills each year.
- Case 2: The environmental protection department deployed online BOD instrument in the tributaries of the Yangtze River, and successfully warned a company of illegal discharge of high-concentration organic matter in 2024.
Real-time monitoring by the BOD online water quality analyzer can significantly improve water quality management efficiency and provide data support for pollution prevention and control.
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