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Adaptive quick chemical oxygen demand (COD) on-line measuring method

A chemical oxygen demand, self-adaptive technology, applied in the field of chemical oxygen demand on-line determination method, can solve the problems of inability to set the best digestion time for water samples, large errors, and prolonging the measurement period of water samples.

Inactive Publication Date: 2012-01-25
杭州慕迪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following disadvantages in adopting manual setting of digestion time: (1) large error
The manual setting of the digestion time is based on empirical values. When the water samples are unstable or from various sources, due to the lack of relevant information on the water samples, it is impossible to set an optimal digestion time suitable for all water samples; (2) when different water samples The optimal digestion time between samples differs greatly, and it is necessary to set the digestion time for each sample. Since the digestion time is reset every time, the instrument needs to be calibrated again, which greatly prolongs the measurement cycle of water samples. , and cause waste of reagents and loss of instruments

Method used

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  • Adaptive quick chemical oxygen demand (COD) on-line measuring method
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  • Adaptive quick chemical oxygen demand (COD) on-line measuring method

Examples

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Effect test

Embodiment 1

[0017] The chemical oxygen demand of certain brewery sewage is measured by the method provided by the invention. After preparing 1m of concentrated sulfuric acid with a concentration of 65% containing silver reagent and 1ml of potassium dichromate solution with a concentration of 0.5mol / L to prepare a uniform and stable mixed reagent with high oxidation capacity, the chemical oxygen demand online analyzer Add the above-mentioned mixed reagent and 2ml water sample into the digestion tank with a syringe pump and a dosing device, and then start to heat up. When the temperature of the digestion tank rises to 160°C for 1 minute, the microcomputer processing module starts to collect 20 continuous COD measurement values ​​during the digestion process, and calculates the repeatability error of this set of data. When the repeatability error is less than or equal to 10 %, then the last sampling time is the termination time of the digestion reaction, thus it is known that the digestion t...

Embodiment 2

[0019] The method provided by the invention is used to measure the chemical oxygen demand of sewage from a certain chemical plant. After preparing 1m of concentrated sulfuric acid with a concentration of 70% containing silver reagent and 1ml of potassium dichromate solution with a concentration of 0.2mol / L to prepare a uniform and stable mixed reagent with high oxidation capacity, the chemical oxygen demand online analyzer Add the above-mentioned mixed reagent and 2ml water sample into the digestion tank with a syringe pump and a dosing device, and then start to heat up. When the temperature of the digestion tank rises to 170°C for 1 minute, the microcomputer processing module starts to collect 20 continuous COD measurement values ​​during the digestion reaction, and calculates the repeatability error of this set of data. When the repeatability error is less than or equal to 5 %, the last sampling time is the termination time of the digestion reaction, thus we know that the di...

Embodiment 3

[0021] The method provided by the invention is used to measure the chemical oxygen demand of sewage from a certain printing and dyeing factory. After preparing 1m of concentrated sulfuric acid with a concentration of 90% containing silver reagent and 1ml of potassium dichromate solution with a concentration of 0.06mol / L to prepare a uniform and stable mixed reagent with high oxidation capacity, the chemical oxygen demand online analyzer Add the above-mentioned mixed reagent and 2ml water sample into the digestion tank with a syringe pump and a dosing device, and then start to heat up. When the temperature of the digestion tank rises to 190°C for 1 minute, the microcomputer processing module starts to collect 20 continuous COD measurement values ​​during the digestion reaction process, and calculates the repeatability error of this set of data. When the repeatability error is less than or equal to 5 %, the last sampling time is the termination time of the digestion reaction, an...

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Abstract

The invention relates to an adaptive quick chemical oxygen demand (COD) on-line measuring method in the water quality analysis field. The method comprises the following steps of: preparing a uniform and stable mixed reagent with high oxidation capability by using acid reaction reagent, oxidant and other reagents, adding the mixed reagent and a certain amount of water sample into a digestion pool through an injection pump in a COD on-line analyzer and a quantification device, and then heating the mixture. When the temperature of the digestion pool is raised to the temperature required for the digestion reaction, a microcomputer processing module begins to acquire a certain number of continuous COD measurement values in the digestion reaction, and calculates the repeatability error of the data. When the repeatability error is greater than the required precision requirement, the microcomputer processing module continues sampling and calculation till the repeatability error is less than or equal to the required precision requirement, and the last sampling time point is the termination time point of the digestion reaction. The method has the advantages of greatly shortening the measurement period of the water sample and reducing the loss of the instrument.

Description

technical field [0001] The present invention relates to the on-line determination method of chemical oxygen demand (COD) in the field of water quality monitoring and analysis, in particular, relates to an adaptive rapid Chemical oxygen demand (COD) online determination method. Background technique [0002] Chemical oxygen demand refers to the amount of oxidizing agent consumed by oxidizing reducing substances in 1 liter of water sample with a strong oxidizing agent under certain conditions, expressed in mg / L of oxygen. COD reflects the degree of water pollution by reducing substances. It is one of the main indicators of water pollution and an important item for water quality monitoring of surface water, industrial wastewater, drinking water, hospital sewage and seawater. There are two current national standard methods for the determination of chemical oxygen demand in my country: one is the permanganate index method, which is suitable for the detection of chemical oxygen de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/00G01N1/44
Inventor 王磊张晓敏周亿文张景东缪国超
Owner 杭州慕迪科技有限公司