Method for monitoring COD (chemical oxygen demand) in fluorescent wastewater

A chemical oxygen demand, fluorescent wastewater technology, applied in the measurement of color/spectral characteristics, preparation of test samples, etc., can solve the problem that cannot meet the monitoring requirements of large-scale, fast, high-efficiency, energy-saving, environmental protection, and the occupation of return devices. Large space, large consumption of precious reagents, etc., to achieve accurate and reliable test results, less secondary pollution, and comparable results

Inactive Publication Date: 2013-09-04
SHENYANG AIRCRAFT CORP
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Problems solved by technology

[0002] Due to the special composition of fluorescent wastewater, which mainly includes macromolecular chain substances such as fluorescent agents, mineral oil, kerosene, surfactants, and additives, and some harmful substances are volatile during the analysis process, the chemical oxygen demand (COD) in fluorescent wastewater ( COD) monitoring, the preferred monitoring and analysis method of the environmental monitoring department is the traditional national standard potassium dichromate method (GB / T11914-1989). The shortcomings of long analysis time, cumbersome manual operation, large consumption of precious reagents, and serious secondary pollution of heavy metals cannot meet the monitoring requirements of large quantities, fast, efficient, energy-saving, and environmental protection of enterprises.

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  • Method for monitoring COD (chemical oxygen demand) in fluorescent wastewater
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  • Method for monitoring COD (chemical oxygen demand) in fluorescent wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 Verification of Oxidation Ability of Closed Tube Digestion Spectrophotometry for Determination of Chemical Oxygen Demand

[0025] Sodium acetate was used to prepare standard solutions with COD theoretical values ​​of 1000 mg / L and 250 mg / L, respectively, and were determined by closed-tube digestion method, open-tube digestion method and national standard GB / T11914-1989 potassium dichromate method. The method of digestion spectrophotometry is as follows:

[0026] 1) Draw 2.5mL of homogeneous mixed water sample into the reaction tube, add 0.7mL of the above oxidant solution, add 4.8mL of the above composite catalyst, add 0.35mL of the above masking agent, and shake well;

[0027] 2) Place the above reaction tube in a digester at 160-165°C, cover the reaction tube, digest for 10-15 minutes and take it out;

[0028] 3) After taking it out, cool it in the air, add 2.5mL deionized water, mix well, and then cool it to room temperature;

[0029] 4) Then pour it into...

Embodiment 2

[0034] Example 2 The comparison of standard solutions with different concentration levels using the closed tube digestion method and the open tube digestion method to test COD

[0035] Potassium hydrogen phthalate was used to prepare standard solutions with COD concentrations of 250 mg / L, 400 mg / L, 700 mg / L and 1000 mg / L, respectively. Potassium hydrogen phthalate standard solution: Weigh 0.8502 g of potassium hydrogen phthalate that was baked at 105°C to constant weight, dissolve in water, transfer to a 1000 mL volumetric flask, dilute to the mark and mix well, this solution is equivalent to 1000mg / LO 2 The COD of the above-mentioned potassium hydrogen phthalate standard solution was measured by closed-tube digestion method and open-tube digestion method respectively.

[0036] The closed-tube digestion method is as follows:

[0037] 1) Draw 2.5mL homogeneous mixed water sample into the reaction tube, add 0.7mL oxidant solution, add 4.8mL composite catalyst, add 0.35mL maski...

Embodiment 3

[0043] Embodiment 3 Using the closed-pipe digestion method of the present invention, the open-pipe digestion method and the national standard potassium dichromate method to monitor the comparison of fluorescent wastewater at the company's total sewage discharge outlet and workshop outlet

[0044] Fluorescent wastewater from the total sewage discharge outlet and the workshop outlet were collected in five different time periods. The components of the fluorescent wastewater mainly include fluorescent agents, mineral oil, kerosene, surfactants and additives and other macromolecular chain substances. Simultaneously Closed tube digestion method, open tube digestion method and standard potassium dichromate method were used to determine the COD value in wastewater. The results are shown in Table 2 below: From the data in Table 2, it can be seen that the data measured by the closed-tube method is more comparable to the national standard potassium dichromate method, and the closed-tube d...

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Abstract

The invention discloses a method for monitoring COD in fluorescent wastewater, wherein a closed tube digestion spectrophotometric method is adopted for monitoring COD in fluorescent wastewater. According to the method for monitoring COD in fluorescent wastewater, the closed tube digestion spectrophotometric method comprises the steps as follows: 1), 2.5-3mL of homogenous mixed water sample is absorbed in a reaction tube, 0.5-1mL of an oxidizing agent solution is added, 4-6mL of a composite catalyst, 0.3-0.5mL of a masking agent is added, and the solution are shaken uniformly; 2), the reaction tube is placed in a digester at the temperature ranging from 160 DEG C to 165 DEG C, a reaction tube cover is covered, and the reaction tube is taken out after digested for 10-15min; 3), the reaction tube is cooled in the air after being taken out, 2.5mL of deionized water is added and uniformly shaken, and water cooling is performed until the room temperature is achieved; and 4), then the solution is poured into a cuvette, absorbance is measured by a spectrophotometer, and finally a COD concentration value is obtained. The closed tube digestion spectrophotometric method is used for monitoring COD in fluorescent wastewater, so that the accuracy of monitored data is guaranteed, the operation environment is more environment-friendly and safer, and damage to human body health due to volatilized harmful substances is prevented.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, and in particular relates to a method for monitoring chemical oxygen demand in fluorescent wastewater. Background technique [0002] Due to the special composition of fluorescent wastewater, which mainly includes macromolecular chain substances such as fluorescent agents, mineral oil, kerosene, surfactants, and additives, and some harmful substances are volatile during the analysis process, the chemical oxygen demand (COD) in fluorescent wastewater ( COD) monitoring, the preferred monitoring and analysis method of the environmental monitoring department is the traditional national standard potassium dichromate method (GB / T11914-1989). The shortcomings of time-consuming analysis, cumbersome manual operation, large consumption of precious reagents, and serious secondary pollution of heavy metals cannot meet the monitoring requirements of large-scale, fast, efficient, energy-saving, and envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
Inventor 佟明远李立董秀包跃宇马艳茹高璐佳由爱娟叶辉
Owner SHENYANG AIRCRAFT CORP
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