What's the DOC( Dissolved Organic Carbon) online water quality analyzer?
Release time:2025.11.27
What's the DOC( Dissolved Organic Carbon) online water quality analyzer
I. Definition and function of the DOC online water quality analyzer
DOC (dissolved organic carbon) refers to the total amount of organic carbon (unit: mg / L) that can be passed through the 0.45 micron filter membrane in the water, reflecting the degree of pollution of dissolved organic matter in the water body.
DOC online water quality analyzer can continuously monitor DOC value in water body in real time, and quickly evaluate water quality safety through automatic analysis. It is suitable for drinking water treatment, sewage treatment, industrial wastewater and environmental monitoring and other scenarios.
II. The core working principle
The mainstream DOC online analyzer adopts the ultraviolet absorption method or the chemical oxidation method:
UV absorption method
- DOC values were calculated directly by spectroscopic analysis using the UV absorption properties of organic matter at 254nm.
- Features: no reagent consumption, low maintenance cost, fast response time (minute level),
III. Function and technical parameters
1. Core functions
- Real-time monitoring: support 24-hour continuous detection, the measurement interval can be set (such as 10 minutes to several hours).
- Automatic operation: automatic sampling, filtering (0.45 μ m), measurement and data storage.
- Alarm and control: trigger the alarm when exceeding the standard, and the linkage equipment adjusts the processing process (such as strengthening coagulation).
- Data management: support RS485 remote transmission, compatible with SCADA system, built-in storage (5 years old data).
2. Key technical indicators
Parameter | Typical range | Accuracy | Response time |
DOC measuring range | 0-500 mg/L (file is optional) | ± within 5% | For 1-10 minutes |
test method | UV absorption method | - | - |
capacity of resisting disturbance | Automatic compensation for turbidity and temperature influence | - | - |
Reagent consumption | No (UV method) | - | - |
IV. Application scenarios
- Drinking water treatment: monitor the DOC of raw water and factory water, optimize the disinfection process, and reduce the generation of halogenated hydrocarbon by-products.
- Sewage treatment: to evaluate the efficiency of the biochemical treatment unit and control the concentration of the effluent organic matter.
- Industrial wastewater: chemical, pharmaceutical and other high organic matter discharge industries, real-time monitoring of the discharge outlet DOC value.
- Environmental monitoring: long-term monitoring of surface water such as lakes and rivers, and early warning of organic pollution events.
V. Advantage and limitations
Superiority
- Timeliness: Real-time data supports rapid decision making and avoiding laboratory testing (hours to days).
- Economy: the UV method has no reagent consumption, and the operation and maintenance cost is significantly lower than that of the chemical method.
- Intelligent: support automatic calibration, remote maintenance, suitable for unattended scene.
VI. Selection suggestions
- Detection scenario: ultraviolet method (reagent free) is preferred for drinking water treatment, and chemical oxidation of industrial wastewater (high precision).
- Measurement range: Select the low range (0-50 mg/L) or the high range (0-500 mg/L) according to the requirements.
- Compliance: Confirm that the instrument meets the national or industry standards
- Maintenance convenience: select modular design, easy to replace parts to reduce downtime.
VII. Typical cases
- Case 1: A drinking water plant optimized the amount of flocculant through the DOC online instrument, the DOC removal rate was increased by 15%, and the disinfection by-products were reduced by 20%.
- Case 2: The environmental protection department deployed the UV method DOC online instrument in the Taihu Lake basin, and successfully tracked the illegal discharge of high-concentration organic matter by an enterprise in 2024.
Through the real-time monitoring of DOC online water quality analyzer, water organic pollution can be effectively controlled and water quality safety is guaranteed.
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