Ultraviolet fluorescence double-signal water quality monitoring device taking LED (light emitting diode) as light source and application method of device

A technology for light-emitting diodes and water quality monitoring, which is applied in measuring devices, fluorescence/phosphorescence, color/spectral characteristic measurement, etc., can solve the problem that the fluorescence method is difficult to reflect the change of the total concentration of dissolved organic matter, and it is difficult to reflect the dissolved organic matter of proteins and humic substances Change trends and other issues, to achieve real-time monitoring of water quality changes, no need for digestion reaction time, and low energy consumption

Active Publication Date: 2014-12-10
NANJING UNIV
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Problems solved by technology

[0009] Aiming at the problem that the ultraviolet method in the prior art is difficult to reflect the change trend of protein and humic dissolved organic matter, and the fluorescence method is difficult to reflect the change of the total concentration of dissolved organic matter, the present invention provides a light emitting diode as light source Ultraviolet fluorescence dual-signal water quality monitoring device and application method thereof

Method used

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  • Ultraviolet fluorescence double-signal water quality monitoring device taking LED (light emitting diode) as light source and application method of device
  • Ultraviolet fluorescence double-signal water quality monitoring device taking LED (light emitting diode) as light source and application method of device
  • Ultraviolet fluorescence double-signal water quality monitoring device taking LED (light emitting diode) as light source and application method of device

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Embodiment 1

[0042] figure 2 with image 3 It is a structural schematic diagram of the optical path part of this embodiment. The LED light source 11 in the optical path part 3 is controlled by the light source control circuit 2 to emit ultraviolet light, which is collimated by the lens A12, passes through the quartz plate A13, and irradiates the water sample, and the unabsorbed ultraviolet light passes through the quartz plate B14 and the filter A15 is focused to the ultraviolet detector 17 through the lens B16; the fluorescence emitted by the water sample is focused to the fluorescence detector 21 through the quartz plate C18, the filter B19 and the lens C20. When the central wavelength of the LED light source selected for the LED light source 11 is less than 300nm, the ultraviolet detector 17 uses a wide-bandgap AlGaN-based photodiode, which has the advantage of not responding to fluorescence greater than 300nm, so the filter A15 can be omitted. The center wavelength of the LED light ...

Embodiment 2

[0053] Step 1. Collect the water body that requires online monitoring of wastewater from a printing and dyeing industry. Use a fluorescence spectrometer to scan the three-dimensional fluorescence spectrum. The scanning range is set to an excitation wavelength of 200-450nm and an emission wavelength of 280-550nm to confirm the center of the fluorescence peak. Typical printing and dyeing wastewater The three-dimensional fluorescence map of the secondary biochemical treatment effluent is as follows: Figure 7 As shown, there are 5 fluorescent peaks, the central positions of which are Ex230 / Em340, Ex280 / Em325, Ex250 / Em460, Ex310 / Em460 and Ex365 / Em460nm. According to the literature Wen-TaoLi, et.al., HPLC / HPSEC-FLD with multi-excitation / emissions can for EEM interpretation and dissolved organic matter analysis, 2013, Water Research, 1246-1256), the use of high performance liquid chromatography or size exclusion chromatography with multi-excitation or multi-emission fluorescence scan...

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Abstract

The invention discloses an ultraviolet fluorescence double-signal water quality monitoring device taking an LED (light emitting diode) as a light source and an application method of the device, and belongs to the field of environmental monitoring and water treatment. The ultraviolet fluorescence double-signal water quality monitoring device taking the LED as the light source consists of a sample collecting part and a detection part. The application method comprises the steps of selecting a deep ultraviolet LED lamp light source with specific wavelength and a photoelectric detector component according to a three-dimensional fluorescence atlas, detecting fluorescence intensity and ultraviolet absorption at the specific wavelength at the same time and calculating a ratio of the fluorescence intensity to the corresponding ultraviolet absorption. According to the device, no chemical reagent is consumed, monitoring of total concentration change of soluble organic matters in a water body can be realized, change of concentration of fluorescence ingredients such as proteins and humus can be reflected at the same time, and the sensitive, quick, efficient, economical, easy and information-rich on-line monitoring device is provided for the water treatment.

Description

technical field [0001] The invention relates to the fields of environmental monitoring and water treatment, in particular to an ultraviolet fluorescent dual-signal water quality monitoring device using LED light-emitting diodes as a light source and an application method thereof. Background technique [0002] Dissolved organic matter in natural water bodies, especially humic substances and proteins, participates in geobiochemical processes such as photochemical reactions, pollutant migration and transformation, microbial activities, and carbon cycle. In the process of drinking water and sewage treatment, dissolved organic matter is the main removal object. Especially in the process of drinking water treatment, humus and protein substances are important precursors of disinfection by-products in the chlorination disinfection process, and affect the growth of bacteria in the pipeline. The composition and properties of dissolved organic matter have an important impact on the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/64G01N21/33
Inventor 李文涛武辰飞李爱民陆海田王昊苏统奎李启端
Owner NANJING UNIV
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