What Is Cod Used For

Is high COD good or bad?

1.1 Chemical Oxygen Demand. COD is an indicative measurement of the amount of oxygen that can be consumed by reactions in a measured solution. COD detection can be used to easily quantify the amount of organics in water. The higher the COD value, the more serious the pollution of organic matter by water. Our post about cod payment term.

What is COD in water treatment?

The chemical oxygen demand (COD) is a measure of water and wastewater quality. The COD test is often used to monitor water treatment plant efficiency. This test is based on the fact that a strong oxidizing agent, under acidic conditions, can fully oxidize almost any organic compound to carbon dioxide.

What are the effects of COD?

Higher COD levels mean a greater amount of oxidizable organic material in the sample, which will reduce dissolved oxygen (DO) levels. A reduction in DO can lead to anaerobic conditions, which is deleterious to higher aquatic life forms. See also: cod science.

What is BOD and COD used for?

BOD of wastewater effluents is used to indicate the short-term impact on the oxygen levels of the receiving water. BOD analysis similar in function to chemical oxygen demand (COD) analysis, in that both measure the amount of organic compounds in water.

Why is COD higher than BOD?

COD stands for 'Chemical Oxygen Demand' where BOD stands for Biochemical Oxygen Demand. COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. Read about cod and bod.

What is COD limit?

COD is a measure of the amount of oxygen required to breakdown the organic matter in a sample under very strong oxidizing conditions.

What happens if COD is high?

When the COD levels are higher, there is a greater demand for oxygen. This means that there is likely more oxidizable organic material in water with high COD levels. This also means that there are reduced Dissolved Oxygen (DO) concentrations in wastewater with high COD levels. See more: cod stand for.

What causes high COD in wastewater?

COD increases as the concentration of organic material increases. It also increases if inorganic compounds susceptible to oxidation by the oxidant (typically dichromate) are present. Water with high COD typically contains high levels of decaying plant matter, human waste, or industrial effluent. See also: cod treatment.

How do you get COD water?

What test methods are typically used to determine COD at water and wastewater laboratories? The most common test method is the colorimetric analysis after oxidizing the COD with acid and using indicator compounds, such as hexavalent dichromate. Read about cod wastewater.

How is COD calculated?

Chemical oxygen demand, or COD, is a test that measures the amount of organic compounds in water. Consider the formula for COD calculation: (a - b) X C X 8,000 / the volume of the sample in mL. Let "a" represent the titrant used for your sample expressed in mL.

What COD means?

In environmental chemistry, the chemical oxygen demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. The most common application of COD is in quantifying the amount of oxidizable pollutants found in surface water (e.g. lakes and rivers) or wastewater.

How is COD load calculated?

BOD (or COD) load: Units: kg/dayThis simply done by multiplying the BOD in mg/l by the daily effluent volume in cubic metres (m3) and dividing the product by 1000.

What is the difference between BOD and COD?

The main difference between BOD and COD is that BOD is the amount of oxygen which is consumed by bacteria while decomposing organic matter under aerobic conditions whereas COD is the amount of oxygen required for the chemical oxidation of total organic matter in water.

What is the COD value of drinking water?

The concentrations of COD observed in surface waters range from 20 mg/l O2 or less in unpolluted waters to greater than 200 mg/l O2 in waters receiving effluents. Industrial wastewaters may have COD values ranging from 100 mg/l O2 to 60,000 mg/ O2.

Why do we need to remove BOD and COD?

COD/BOD Removal From WaterBOD and COD can reduce the DO of lakes and rivers, and low concentrations can cause eutrophication and harm aquatic life. Municipal wastewater discharge and industrial processes can create water high in COD/BOD, requiring careful treatment before discharge to preserve the health of waterways.

What is BOD and COD of sewage water?

COD is closely related to BOD or Biochemical Oxygen Demand, the difference being that BOD is a test of the level of organic matter that can be biologically oxidised while COD is a test of the amount of organic matter that can be chemically oxidised.

What is BOD of drinking water?

BOD is the biochemical oxygen demand of the water and it is related to the concentration of the bacterial facilitated decomposable organic material in the water. For freshwater the concentration should be less than 0.0004 mg/L.

What is a good BOD level?

A BOD level of 1-2 ppm is considered very good. There will not be much organic waste present in the water supply. A water supply with a BOD level of 3-5 ppm is considered moderately clean.

What is a cod sperm?

Shirako is the milt, or sperm sacs, of male cod. It's served in both raw and cooked form in restaurants all over Japan, but many Japanese consider it an acquired taste. The word “shirako” means “white children,” and it is in season in the winter.

Does aeration reduce COD?

Aeration should help reduce the COD in 2 ways. First it may evaporate some volatiles like hexane. Second it will add oxygen to the water speeding up any biological oxidation of the less volatile organics by the bacteria (microbial growth). It will actually increase the COD very quickly.


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