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Method for removing waste water chemical oxygen demand detection interference due to hydrogen peroxide

A technology of chemical oxygen demand and hydrogen peroxide, which is applied in the field of determination of related indicators of environmental governance, can solve problems such as interference and high measured values, and achieve the effect of accurate evaluation of degradation laws

Inactive Publication Date: 2012-05-09
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, solve when using Fenton's reagent to process low-concentration COD wastewater, residual hydrogen peroxide will interfere with the measurement of COD by the traditional potassium dichromate method after the completion of the reaction, so that the measured value is on the high side. a phenomenon

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Embodiment Construction

[0009] The technical solutions of the present invention will be further described below in conjunction with specific embodiments. Potassium dichromate spectrophotometry is used for COD measurement, and the model of COD analyzer is Hach DR2800.

[0010] Add 0.1g of 30wt% hydrogen peroxide solution in distilled water, and the measured COD value is 47mg / L; the dosage of manganese dioxide is: 1.0g, 2.0g, 2.5g and 3.0g respectively; the reaction time is 10min, 15min , 20min and 30min; the reaction temperatures were 30°C, 40°C, 45°C and 50°C. The test results show that after adding 2.5g of manganese dioxide and shaking at 45°C for 20 minutes, the COD concentration is reduced to 5.5mg / L, which is close to the real value of 0mg / L.

[0011] Specific usage examples

[0012] When using Fe 2+ and H 2 o 2 When the Fenton reagent with a molar ratio of 1:1 treats refractory industrial wastewater with COD=158mg / L (the wastewater is taken from Tianjin Xiqing Industrial Park Sewage Treatme...

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Abstract

The present invention discloses a method for removing waste water chemical oxygen demand (COD) detection interference due to hydrogen peroxide. According to the method, a solution requiring detection is placed in a reaction container; manganese dioxide is added to the container, and a constant temperature reaction is performed; the resulting solution after the reaction is filtered; the resulting filtrate is subjected to a subsequent COD test. According to the technical scheme of the present invention, the manganese dioxide is adopted as a catalyst to promote the residual hydrogen peroxide to decompose into oxygen and water, such that the influence on the COD test due to the residual hydrogen peroxide is eliminated. With the present invention, a small amount of the manganese dioxide drug is added, such that the influence on the COD detection due to the residual hydrogen peroxide after the reaction of the Fenton regent and the low concentration COD water sample is eliminated to the maximal degree so as to provide great significance for precise study of degradation regularity of organic matters in the Fenton system and accurate assessment of treatment effects.

Description

technical field [0001] The invention relates to a technique for measuring related indicators of environmental governance, and more specifically, relates to a solution to the interference of residual hydrogen peroxide on the determination of the chemical oxygen demand of wastewater after wastewater is treated by Fenton's reagent. Background technique [0002] The Fenton method and the photo-Fenton catalysis method can produce OH during the reaction process, and can treat organic wastewater that is difficult to biodegrade very well, so they have become one of the widely used advanced oxidation technologies. However, when COD (chemical oxygen demand) is measured by the traditional potassium dichromate method (potassium dichromate reflux titration or potassium dichromate spectrophotometry), residual hydrogen peroxide will reduce part of the potassium dichromate , resulting in high COD values. Especially in low concentration COD wastewater, this phenomenon is more obvious. This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 王灿季民孔鑫
Owner TIANJIN UNIV
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