Fast detection method for soluble COD in purified terephthalic acid production waste water

A technology of purified terephthalic acid and production wastewater, applied in the measurement of color/spectral characteristics, etc., can solve the problems of high price, long time, environmental pollution, etc., achieve fast detection speed, eliminate environmental pollution, high economic and environmental benefits Effect

Inactive Publication Date: 2019-04-30
TIANJIN CHENGJIAN UNIV
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  • Application Information

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Problems solved by technology

Although the current conventional COD detection method is relatively accurate for the COD analysis of PTA wastewater, it takes a long time, usually more than 2 hours
At the same time, the COD test agents are mainly potassium dichromate, concentrated sulfuric acid, silver sulfate, mercury sulfate, etc. These agents are expensive and will cause serious pollution to the environment

Method used

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  • Fast detection method for soluble COD in purified terephthalic acid production waste water
  • Fast detection method for soluble COD in purified terephthalic acid production waste water
  • Fast detection method for soluble COD in purified terephthalic acid production waste water

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Embodiment

[0031] The present invention is applied to the rapid detection of COD in PTA wastewater of a petrochemical sewage treatment plant in Tianjin, including the following steps:

[0032] 1. Establishment of standard curve

[0033] (1) Multiple samples were taken at the PTA wastewater sampling point of the petrochemical sewage plant, and the PTA wastewater COD was analyzed by rapid digestion spectrophotometry (HJ / T399-2007);

[0034] (2) For PTA wastewater samples, adjust the pH to 7.0±0.1, dilute 50 times with deionized water and constant volume, and remove suspended matter with a 0.45 μm filter membrane to ensure that the UV absorbance is between 0.5-2.5. After the UV-visible spectrophotometer was adjusted to zero with deionized water, the diluted water sample was scanned with UV-visible light ( figure 1 );

[0035] (3) The resulting spectral absorbance and corresponding COD are analyzed by factor analysis and correlation analysis ( figure 2 and Table 1), factor analysis shows...

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Abstract

The invention relates to a fast detection method for soluble COD in purified terephthalic acid production waste water. According to the invention, ultraviolet spectrum fingerprint characteristics of the PTA waste water are analyzed, the characteristic spectrum of PTA is found out by combining statistical analysis, and a linear relationship is established with the soluble COD. The fast detection method realizes fast detection for the soluble COD in the PTA waste water. Compared with the conventional COD detection method, the fast detection method can greatly reduce the time cost of COD detection. Meanwhile, the fast detection method can greatly save the cost of COD testing agents, can eliminate the environmental pollution caused by COD detection, and has extremely high economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage detection, and in particular relates to a rapid detection method for soluble COD in purified terephthalic acid (PTA) production wastewater. Background technique [0002] At present, rapid digestion spectrophotometry (HJ / T399-2007) is commonly used for COD detection of PTA production wastewater in the petrochemical industry, which is used to guide the commissioning and operation management of petrochemical wastewater treatment facilities. Although the current conventional COD detection method is relatively accurate in the analysis of PTA wastewater COD, it takes a long time, usually more than 2 hours. At the same time, the COD test reagents are mainly potassium dichromate, concentrated sulfuric acid, silver sulfate, mercury sulfate, etc. These reagents are expensive and will cause serious pollution to the environment. Therefore, on the premise of ensuring the accuracy of the COD test, how to shorte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 王栋黄宝华季民孙力平王少坡于静洁
Owner TIANJIN CHENGJIAN UNIV
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