Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof

A UV-LED and water quality sensor technology, applied in fluorescence/phosphorescence, color/spectral characteristic measurement, material excitation analysis, etc., can solve the problems of inconvenient portability, multi-light source error, large volume, etc., and achieve simple structure and no need for heat dissipation , small size effect

Active Publication Date: 2015-12-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems in the prior art that the ultraviolet absorption analysis equipment for water quality detection is often bulky and inconvenient to carry, high i

Method used

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  • Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof
  • Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof
  • Ultraviolet fluorescence three-signal water quality sensor taking single UV-LED as light source and application thereof

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Embodiment 1

[0044] A kind of UV-fluorescent three-signal water quality sensor with a single UV-LED as the light source in this embodiment can simultaneously monitor the three signals of UV absorbance UV280, protein fluorescence and humic substance fluorescence, such as figure 1 As shown, including the optical path part and the signal control processing part, such as Figure 5 As shown, the optical path part includes UV-LED51, sample cell 52, ultraviolet detector, fluorescence detector A and fluorescence detector B; the UV-LED selects a deep ultraviolet LED with a wavelength of 280±15nm, is packaged in a TO39 bracket, and has a luminous angle smaller than 30 degrees. The ultraviolet detector adopts a photodiode 55 with enhanced ultraviolet response. The fluorescence detector includes a silicon photodiode 55 and a band-pass filter. The band-pass filter A53 with a wavelength of 330-360 nm is used for the monitoring of protein fluorescence; at the same time, the band-pass filter B54 with a w...

Embodiment 2

[0057] The specific structure of the ultraviolet fluorescent three-signal water quality sensor using a single UV-LED as a light source in this embodiment is the same as that in Embodiment 1, and can be applied to the prediction of the generation potential of disinfection by-products in drinking water.

[0058] The disinfection generation potential experiment was carried out on drinking water source water and its water samples after enhanced coagulation and ion exchange treatment in 16 counties and cities in Jiangsu Province. Water quality sensors were used to test the UV280 ultraviolet absorbance, protein and humic substance fluorescence signals of each water sample. The disinfection by-product indicators trihalomethanes (THMs) and haloacetic acids (HAAs) were detected by gas chromatography and gas chromatography mass spectrometry. Such as Figure 9 As shown, by fitting the spectral signal and the generation amount of disinfection by-products, the results show that all three s...

Embodiment 3

[0060] The ultraviolet fluorescent three-signal water quality sensor using a single UV-LED as a light source in this embodiment can be applied to predict the degradation degree of micro-pollutants in the advanced ozone oxidation process.

[0061] The ultraviolet fluorescent three-signal water quality sensor of the present embodiment monitors the water quality change curve in the process of ozone oxidation online, such as Figure 10As shown, it is divided into pure water zero calibration stage 101 , water inflow stage 102 , stabilization stage 103 and ozone degradation stage 104 . The inventor of the present application has studied the relationship between the degree of degradation of 14 kinds of micropollutants in the ozone oxidation process and the removal rate of ultraviolet absorbance UV280 or protein fluorescent signal or humic substance fluorescent signal. These 14 kinds of micropollutants include: bisphenol A ( CAS: 80-05-7), Carbamazepine (CAS: 298-46-4), Diclofenac Sod...

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Abstract

The invention discloses an ultraviolet fluorescence three-signal water quality sensor taking a single UV-LED as a light source and an application thereof and belongs to the fields of environmental monitoring and water treatment. The ultraviolet fluorescence three-signal water quality sensor comprises a light path part and a signal control processing part, wherein the light path part comprises one UV-LED, a sample tank, an ultraviolet probe, a fluorescent probe A and a fluorescent probe B; and the signal control processing part comprises a power supply module, a signal amplifier A, a signal amplifier B, a signal amplifier C, an analog-digital converter and a micro processor. The ultraviolet fluorescence three-signal water quality sensor has the advantages that no chemical reagent is consumed, real-time monitoring on change of overall concentration of dissolved organic matters in water can be realized, and real-time change of concentration of a protein or humus fluorescent component can be reflected, so that the ultraviolet fluorescence three-signal water quality sensor can be used for online predicting disinfection byproduct formation potential and degradation degree of micropollutants in an advanced oxidation process, and a flexible, rapid, efficient, economic, simple and informative online monitoring device is provided for water treatment.

Description

technical field [0001] The invention relates to the fields of environmental monitoring and water treatment, in particular to an ultraviolet fluorescent three-signal water quality sensor using a single UV-LED as a light source and its application. Background technique [0002] The composition and properties of dissolved organic matter have an important impact on the treatment effects of enhanced coagulation, membrane filtration, advanced oxidation, adsorption and ion exchange. Dissolved organic matter, especially proteins and humic substances, is an important precursor of disinfection by-products in the chlorination disinfection process, so dissolved organic matter is an important monitoring object in the water treatment process. [0003] Existing water treatment processes usually operate programmatically with set parameters. Due to the fluctuation of water quality, it is difficult to adjust the operating parameters of various water treatment processes in time according to t...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N21/33
Inventor 李文涛武辰飞李爱民陆海苏统奎田王昊李启端金晶李强周庆
Owner NANJING UNIV
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