Determining method of COD of paper waste water

A chemical oxygen demand and papermaking wastewater technology, applied in the measurement of color/spectral characteristics, etc., can solve problems such as affecting accuracy, and achieve the effect of avoiding secondary pollution, simple operation and high accuracy

Inactive Publication Date: 2015-01-21
GUANGDONG DONGGUAN QUALITY SUPERVISION TESTING CENT
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Problems solved by technology

[0004] Since the ultraviolet spectrophotometry is to measure the content of organic substances by testing the change of the light intensity after the ultraviolet light is transmitted through the water sample, the suspended matter in the water will scatter or absorb the transmitted light, which will directly affect the accuracy of the measurement

Method used

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  • Determining method of COD of paper waste water
  • Determining method of COD of paper waste water
  • Determining method of COD of paper waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Determine the UV maximum absorption wavelength of the tested papermaking wastewater

[0022] Taking the papermaking wastewater sample of a pulp mill in Guangxi as an example, the water quality analysis is shown in Table 1. The wastewater is subjected to wavelength scanning to determine the maximum absorption wavelength, see figure 1 . Depend on figure 1 It can be seen that the water sample has maximum absorption peaks at 200-220nm and 272nm bands, but the absorption peaks at 200-220nm bands are caused by the terminal absorption phenomenon of the instrument, and the peaks generated in this band cannot be used as maximum absorption peaks. Therefore, it can be determined that the maximum ultraviolet absorption wavelength of this wastewater is 272nm, and the absorbance value at this wavelength is 1.169.

[0023] Table 1 Water quality indicators of papermaking wastewater

[0024]

[0025] 2) Determine the correlation curve between absorbance and COD

[0026] Dilut...

Embodiment 2

[0029] Embodiment 2 Measurement result accuracy test

[0030] Using the method described in Example 1, 5 water samples were taken from the pulp mill at different times, diluted to different times, and the COD value was measured by HJ / T399-2007 and dual-wavelength spectrometry. The results are shown in Table 2. The measurement results of the wastewater dual-wavelength scanning method are slightly smaller than those of the standard method. This is because the COD value obtained by the dual-wavelength scanning method mainly reflects the content of reducible organic matter in the water sample, while the COD value obtained by the standard method not only includes the content of reducible organic matter. , including the content of reducible inorganic substances. Compared with the standard method, the dual-wavelength spectroscopic method has a smaller relative deviation, and the measurement error is less than ±15%.

[0031] Table 2 Comparison of dual-wavelength scanning method and C...

Embodiment 3

[0034] 1) Determine the maximum ultraviolet absorption wavelength of wastewater

[0035] Taking papermaking wastewater from a paper mill in Shandong as an example, the water quality analysis is shown in Table 3. The wastewater is subjected to wavelength scanning to determine the maximum absorption wavelength, see image 3 . Depend on image 3 It can be seen that the water sample has maximum absorption peaks at 203nm and 265nm. It is generally believed that the absorption peak at 203nm wavelength is caused by the terminal absorption phenomenon of the instrument, and the peak generated in this band cannot be used as the maximum absorption peak. Therefore, it can be determined that the maximum ultraviolet absorption wavelength of this wastewater is 265nm, and the absorbance value at this wavelength is 0.62.

[0036] Table 3 Wastewater quality indicators

[0037]

[0038] 2) Determine the correlation curve between absorbance and COD

[0039] Dilute the water sample to diff...

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Abstract

The invention provides a determining method of COD of paper waste water. The method includes following steps: (1) determining an ultraviolet maximum absorption wavelength of to-be-tested paper waste water; (2) drawing a correlation curve of (A maximum absorption wavelength - A546) absorbance to the COD; and (3) preparing to-be-tested paper waste water again, and determining the COD of the to-be-tested paper waste water according to the A maximum absorption wavelength of the absorbance under the ultraviolet maximum absorption wavelength of the to-be-tested paper waste water and the absorbance value A546 under an 546 nm visible light wavelength and according to the correlation curve drawn in the step (2). The determining method is simple in operation, is free of a large amount of repeatability test processes, is reduced in determining time and is free of secondary pollution caused by usage of chemical reagents for detection.

Description

technical field [0001] The invention relates to a method for measuring the chemical oxygen demand of papermaking wastewater, in particular to a method for measuring the chemical oxygen demand by using a dual-wavelength spectrometry. Background technique [0002] Chemical Oxygen Demand (COD for short) refers to the amount of oxidant consumed by reducing substances in water that are easily oxidized by strong oxidants, and the result is converted into the amount of oxygen (in mg / L). It is a comprehensive indicator that characterizes the pollution of water bodies by reducing substances, and is an important parameter for comprehensive evaluation of water quality. The standard methods for the determination of COD in my country are GB 11914-89 "Dichromate Method for Determination of Chemical Oxygen Demand in Water Quality" and HJ / T399-2007 "Determination of Chemical Oxygen Demand in Water Quality by Rapid Digestion Spectrophotometry". It is also an internationally recognized detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 王玉峰石葆莹欧海龙谷历文
Owner GUANGDONG DONGGUAN QUALITY SUPERVISION TESTING CENT
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