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Method for detecting chemical oxygen demand

A technology of chemical oxygen demand and detection method, which is applied in the field of chemical oxygen demand detection, can solve the problem that the COD value cannot be fully and accurately reflected, and achieve the effect of reducing measurement error

Active Publication Date: 2008-12-24
四川安控科技股份有限公司
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Problems solved by technology

[0003] In the prior art, COD can be measured by chemical methods (such as potassium permanganate method, potassium dichromate method) and ultraviolet analysis methods, but the existing COD detection instruments using ultraviolet analysis methods are based on single-wavelength ultraviolet rays. , due to the organic matter in sewage, not all organic matter absorbs a specific wavelength, so COD detection with a single wavelength of ultraviolet light cannot fully and accurately reflect the COD value

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Embodiment 1

[0035] Below further introduce the COD detection device of the present invention through embodiment, as figure 1 As shown, the chemical oxygen demand detection device provided by Embodiment 1 of the present invention includes:

[0036] UV-transmissible sample pool (can be a cuvette) 1, used to hold the sewage sample to be measured;

[0037] The ultraviolet light source 2 is arranged on the top of the sample pool and is used to emit ultraviolet light beams to the sample pool; the ultraviolet light source can be an ultraviolet light source emitting 200-400 nanometer ultraviolet light beams, and specifically a deuterium ultraviolet lamp can be used as the ultraviolet light source.

[0038] The spectrometer 3 is arranged under the sample cell, and is used for spectroscopically processing the ultraviolet light beam transmitted through the sample cell;

[0039] The ultraviolet light intensity detector 4 is used to detect the light intensity of each wavelength beam of the ultraviole...

Embodiment 2

[0052] Such as image 3 As shown, this embodiment is based on Embodiment 1, adding a monitoring device for ultraviolet light sources and a device for measuring turbidity of sewage.

[0053] Since there may be fluctuations in the ultraviolet light source, and the result of fluctuations will inevitably lead to fluctuations in the transmitted ultraviolet light intensity, in order to make the measurement results accurate, it is necessary to remove this light intensity fluctuation through data processing. Therefore, an ultraviolet light source monitoring device 11 can be added to monitor the fluctuation of the optical power of the ultraviolet light source, generate fluctuation data, and send it to the data processor, and the data processor can analyze the ultraviolet light according to the fluctuation data. The light intensity of each wavelength of the ultraviolet light beam output by the intensity detector is corrected, and the chemical oxygen demand is calculated according to the...

Embodiment 3

[0062] This embodiment is a further expansion of Embodiment 1. On the basis of the basic chemical oxygen demand detection device provided in Embodiment 1, relevant peripherals are configured to adapt to real-time automatic detection.

[0063] Such as Figure 4 Shown, it is the structural representation of embodiment 3, comprises:

[0064] A sampling weir 6 connected with the sewage pipeline;

[0065] The water storage tank 7 is connected with the sampling weir and the ultraviolet-transmissible sample pool, and is used to hold the sewage to be tested for continuous sampling. It can also carry out sedimentation treatment on the collected sewage. The purpose of continuous sampling is to better reflect the time situation of the measured sewage. Proportional sampling, after sedimentation and mixing in the water storage tank, can better reflect the actual situation of the factory's sewage. After the collected sewage to be measured in the water storage tank reaches a predetermined...

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Abstract

The invention provides a detection method of chemical oxygen demand, comprising the steps that: the extinction of sewage samples to be detected on a plurality of wavebands to be detected is measured; the extinction is integrated on each waveband to be detected by using the wavelength as integral variable; the integral values A<jf1> to A<jf1n>of the extinction of the sewage samples to be detected on each waveband to be detected are calculated; the integral values are substituted into a formula as follows so as to work out that COD: COD is equal to k1 multiplied by A<jf1 > plus k2 multiplied by A<jf2> ellipsis plus k<n> multiplied by A<jfn>; wherein, k1 to k<n> are the linear relative coefficients of the integral values of the extinction corresponding to each waveband to be detected as well as the COD; n is the number of the waveband to be detected. The technical proposal of the invention indicates that the ultraviolet measurement method of the invention adopting multi-wavelength leads the measurement result to exactly reflect the COD value in comparatively large application range and reduces the measurement errors.

Description

technical field [0001] The invention relates to a method for detecting chemical oxygen demand (abbreviated as COD), in particular to a method for detecting COD by irradiating ultraviolet rays and performing spectral analysis. Background technique [0002] Chemical oxygen demand (COD) refers to the expression method of the oxygen equivalent of organic pollutants that can be oxidized by chemical methods in water, expressed in mg / L. COD reflects the degree of water pollution by reducing substances, including organic matter, nitrite, ferrous salt, sulfide, etc. Water body organic matter pollution is very common, therefore, chemical oxygen demand is also one of the indicators of the relative content of organic matter in water (water pollution degree). [0003] In the prior art, COD can be measured by chemical methods (such as potassium permanganate method, potassium dichromate method) and ultraviolet analysis methods, but the existing COD detection instruments using ultraviolet ...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/01G06F17/12
Inventor 肖亚飞蔡红星赵猛
Owner 四川安控科技股份有限公司
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