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Method for determining indexes of COD and BOD5 in sewage through near infrared spectrometry

A near-infrared spectroscopy and sewage technology, which is applied in the measurement of color/spectral characteristics, measuring devices, and material analysis by optical means, etc., can solve the problems of large measurement index error and spectral characteristic interference, and achieve easy operation and improve timeliness. , the effect of strong practicality

Inactive Publication Date: 2013-06-26
楚广诣
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Problems solved by technology

However, due to the strong absorption of the water in the sewage in the near-infrared spectral region, it will cause strong interference to the spectral characteristics of the indicators to be measured in the sewage, resulting in a large error in the final measurement indicators

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  • Method for determining indexes of COD and BOD5 in sewage through near infrared spectrometry
  • Method for determining indexes of COD and BOD5 in sewage through near infrared spectrometry
  • Method for determining indexes of COD and BOD5 in sewage through near infrared spectrometry

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Embodiment 1

[0055] Embodiment 1, a kind of near-infrared spectrometry COD and BOD in sewage 5 The specific steps of the indicator method are as follows:

[0056] (1) Take 88 sewage samples, and first measure the COD and BOD of the sewage samples by conventional methods 5 standard value, and then measure the near-infrared spectrum of the sewage sample to obtain the original near-infrared spectrum data of the sewage sample (such as figure 1 shown);

[0057] (2) Take 8 pure water samples, measure the near-infrared spectrum of the pure water samples under the same conditions as the sewage samples, and obtain the near-infrared spectrum data of the pure water samples (such as figure 2 shown);

[0058] (3) Use the Savitzky-Golay smoothing filter to filter the original near-infrared spectral data of the sewage samples, use the Kenard-Stone algorithm to divide the sewage samples into 52 sewage samples in the calibration set and 36 sewage samples in the verification set, and use The matlab sof...

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Abstract

The invention provides a method for determining the indexes of COD and BOD5 in sewage through near infrared spectroscopy. The method concretely comprises the following steps: 1, taking a sewage sample, determining the standard values of COD and BOD5 through a routine way, and determining the near infrared spectrum of the sewage sample; 2, taking a pure water sample, and determining the near infrared spectrum of the pure water; 3, preprocessing the spectral data of the sewage sample, dividing the sewage sample into a correction set and a verification set, and calculating to obtain the residual near infrared spectral data of the sewage sample; 4, associating the residual near infrared spectral data of the correction set of the sewage sample with the standard values of COD and BOD5, and establishing a determining model; 5, verifying the determining model; and 6, taking an unknown sewage sample, determining the near infrared spectrum of the unknown sewage sample, repeating step 3, and substituting the residual near infrared spectral data into the determining model to obtain the indexes of COD and BOD5. The method has the advantages of simplicity, rapidness, accuracy and easy operation.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for measuring COD and BOD in sewage by near-infrared spectroscopy 5 indicator method. Background technique [0002] Organic pollution is one of the important pollutants in water pollution. In water quality monitoring, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) are often used 5 ) as an important comprehensive index to evaluate the pollution degree of organic matter in water. At present, the methods for measuring COD index at home and abroad mainly include potassium dichromate method, coulometric method and colorimetric method; 5 The index methods mainly include dilution and inoculation method, fluorescence method and biosensor method. These determination methods usually require pretreatment of samples, complicated operations, and sometimes toxic reagents, which not only endanger human health, but also cause secondary pollution. [0003] In recent...

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Application Information

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IPC IPC(8): G01N21/35G01N21/359
Inventor 楚广诣聂磊贾瑞宝孙韶华孔令华姜红乔常红王辉李涛胡力华
Owner 楚广诣
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