How to facilitate the testing of COD in industrial wastewater treatment?

In your case, because of the different quality of garlic, the content of COD is also different, resulting in the diversification of the determination, it is recommended that you can divide the garlic into several types according to the different quality of garlic, and then measure them separately, each type can take 5 or 3 samples, of course, this needs to be determined according to your actual situation.

Because the number of samples is relatively large, the traditional reflux method is definitely not suitable, one is that the cost is too high, the most important thing is that the measurement time is too long, you can not measure a few samples a day, it is recommended to use the commonly used COD rapid tester, such as "TR-108 COD tester", digestion instrument, prepare the 16-hole intelligent digestion instrument, if the demand is large, you can consider using a 25-hole digestion instrument, you can search on "TR-108 COD tester", TR-108B COD Tester" or "TR-108S COD Tester", you can choose according to your actual needs.

If you have a special laboratory to take samples to the laboratory for measurement, then it is recommended to refer to the "TR-108B portable COD tester", you can easily and quickly get the measured value, print the measurement results at any time, or upload the measurement results to the computer for data analysis, this method of digestion and colorimetry integration, no need to change tubes, up to 16 or 25 samples can be measured at one time. If you are going to take it to the site for measurement, it is recommended to use the "TR-108B Portable COD Tester", which is integrated with digestion and colorimetry, and is convenient for field determination due to its small size, light weight, and self-rechargeable power supply.

A little of the effluent discharged from each quality is collected in a bottle and then tested.

Hello, I am glad to answer for you, dear, COD refers to chemical oxygen demand, which refers to the oxidation dose consumed when treating water samples with a certain strong oxidant under certain conditions. COD is a metric that characterizes the amount of reducing substances, especially organic matter, in water. Therefore, the larger the COD, the more polluted the water body is by organic matter.

There are two types of oxidants commonly used in COD determination, namely potassium dichromate and potassium permanganate. When potassium dichromate is used as an oxidant, the measured value is called CODCR; The value measured with potassium permanganate as an oxidant is CODMN, also known as potassium permanganate index. The potassium dichromate method has high oxidation rate, good reproducibility, accuracy and reliability, and is a classic standard method widely recognized by the international community.

In China's water environment standards, only the value measured by the acid potassium dichromate method is called chemical oxygen demand.

COD stands for Chemical Oxygen Demand. In Xiangblind sewage treatment, COD is an indicator used to measure the concentration of organic pollutants in sewage. It indicates the amount of chemical oxidant required for the oxidative decomposition of organic matter under certain conditions, usually measured in milligrams per liter (mg L).

COD testing is a commonly used test method in wastewater treatment to assess the concentration of organic pollutants in wastewater and the status of water quality. The higher the COD value, the higher the concentration of organic pollutants in the wastewater and the greater the difficulty of treatment. Therefore, in the treatment of sewage excavation and Yannian water, it is necessary to reduce the COD value as much as possible to improve the treatment efficiency and water quality.

1. Dichromate method.

The standard method for the determination of chemical oxygen demand is represented by the Chinese standard GB11914 "Determination of Chemical Oxygen Demand of Water Quality" and the international standard ISO6060 "Determination of Chemical Oxygen Demand of Water Quality".

The determination principle is as follows: in the acidic medium of sulfuric acid, potassium dichromate is used as the oxidant, silver sulfate is used as the catalyst, mercury sulfate is the masking agent of chloride ions, the acidity of sulfuric acid in the digestion reaction solution is 9mol l, the digestion reaction solution is boiled by heating, and the boiling point temperature of 148 2 is the digestion temperature.

2. Potassium permanganate method.

Potassium permanganate is used as an oxidant to determine COD, and the measured is called potassium permanganate index.

Wastewater Treatment Classroom Five ways to test COD.

3. Potassium dichromate method.

Based on the classical standard method, potassium dichromate oxidizes organic substances, hexavalent chromium produces trivalent chromium, and the COD value of the water sample is determined by the relationship between the absorbance value of hexavalent chromium or trivalent chromium and the COD value of the water sample.

4. Rapid digestion method.

The classical standard method is the reflux 2h method, and various rapid analysis methods are proposed to improve the analysis speed of the bridge. There are two main methods: one is to improve the simplicity of the oxidant concentration in the digestion reaction system, increase the acidity of sulfuric acid, increase the reaction temperature, and increase the reaction speed by sensitizing and adding cocatalysts.

5. Spectrophotometry.

The chemical oxygen demand (COD) determination method, whether it is reflux volume method, rapid method or photometric method, is based on potassium dichromate as the oxidant, silver sulfate as the catalyst, and mercury sulfate as the masking agent for chloride ions, and the determination of the COD digestion system under acidic conditions of sulfuric acid.

COD stands for Chemical Oxygen Demand, which is an important parameter for assessing the total amount of organic matter in water. COD refers to the amount of chemical required to complete the total oxidation of tung residue from water or wastewater under certain conditions, usually in mg L. COD can be used as a water pollution indicator to detect organic matter, ammonia nitrogen, nitride and other pollutants in sewage.

COD test results are one of the important bases for evaluating water quality and pollution degree, and are commonly used in sewage treatment and environmental monitoring. In the process of sewage treatment, the COD value can be used as an important indicator to measure the treatment effect of wheel shelter wastewater, and monitoring the COD can help judge whether the performance and process of the treatment equipment are reasonable, and find the problem and treat it in time. Hope it helps.

Hello dear! According to the above, COD is an abbreviation for Chemical Oxygen Demand. COD measures the oxidants required for the decomposition of neutralizing and eliminating organic matter in wastewater to reflect the amount of organic matter in the water body.

COD can directly reflect the chemical bond judgment oxygen demand in the water body, which is an indicator of the degree of water pollution. In terms of wastewater treatment, COD detection can be used to judge the effectiveness of sewage treatment, distinguish different stages of sewage treatment, and provide guidance for sewage treatment plans. This problem relates to COD detection in wastewater treatment, which is a basic knowledge in environmental pollution control.

COD detection is very important in the research and application of environmental engineering and environmental science, which helps to determine the degree of water pollution and guide the development of environmental protection work.

Summary. Hello, it is a pleasure to serve you, I found for you that COD is the abbreviation of chemical oxygen demand, which translates to chemical oxygen demand in Chinese. COD is an indicator used to determine the amount of organic matter in water, which is commonly used in wastewater treatment and environmental monitoring.

COD determination is performed by oxidizing organic matter in a water sample into carbon dioxide and water, and then measuring the amount of oxygen consumed during the oxidation process. The higher the COD value, the higher the organic matter content in the water and the worse the water quality. Therefore, COD is one of the important indicators to evaluate water quality.

Hello, it's a pleasure to serve you, I found out for you that COD is the abbreviation of Chemical Oxygen Demand, which is translated as chemical oxygen demand. COD is an indicator used to determine the amount of organic matter in water, which is commonly used in wastewater treatment and environmental monitoring. COD determination is performed by oxidizing organic matter in a water sample into carbon dioxide and water, and then measuring the amount of oxygen consumed during the oxidation process.

The higher the COD value, the higher the organic matter content in the water and the worse the water quality. Therefore, COD is one of the important indicators for evaluating water quality at the bend side.

Hello, it's a pleasure to serve you, I found out for you that COD is the abbreviation of Chemical Oxygen Demand, which is translated as chemical oxygen demand. COD is an indicator used to determine the amount of organic matter in water, which is commonly used in wastewater treatment and environmental monitoring. COD determination is performed by oxidizing organic matter in a water sample into carbon dioxide and water, and then measuring the amount of oxygen consumed during the oxidation process.

The higher the COD value, the higher the organic matter content in the water and the worse the water quality. Therefore, COD is one of the important indicators for evaluating water quality at the bend side.