COD can test wastewater that is too toxic for the BOD test.
Can I use my COD results to predict my BOD?
| Sample 1: | COD = 2,150 mg/L | BOD = 1,100 mg/L |
|---|---|---|
| Sample 2: | COD = 1,990 mg/L | BOD = 1,050 mg/L |
| COD ÷ BOD = 1,990 ÷ 1,050 = 1.89 | ||
| Sample 3: | COD = 1,850 mg/L | BOD = 997 mg/L |
| COD ÷ BOD = 1,850 ÷ 997 = 1.86 |
Can you convert BOD to COD?
Typically, the average BOD result is divided by the average COD result to find a “conversion factor” between the two parameters. One would then multiply their COD results by this factor to estimate BOD. COD values are almost always higher than BOD values for the same sample.
What is the relation between BOD and COD?
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 the formula to calculate COD?
There is a formula for calculating COD. 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. Let “b” represent the titrant used for your blank sample in mL.
Does BOD COD water analysis?
BOD analysis is similar in function to chemical oxygen demand (COD) analysis, in that both measure the amount of organic compounds in water. However, COD analysis is less specific, since it measures everything that can be chemically oxidized, rather than just levels of biologically oxidized organic matter.
Is COD always higher than BOD?
COD stands for Chemical Oxygen Demand, and it is the amount of oxygen that will be consumed by the chemical break down of both organic and inorganic compounds. As such, COD will always be higher than BOD.
What is difference between BOD and COD method?
Biochemical oxygen demand (BOD) is the amount of oxygen required by the microorganisms to break down the organic materials, whereas chemical oxygen demand (COD) is the amount of oxygen required to break down the organic material via oxidation.
Why is COD always higher than BOD?
always COD is higher about 5 times than BOD because its comprises both Organic and inorganic Pollutants while BOD is only for Organic Pollutants. Dear brother, Simply BOD indicates the biodegradable organic matter (OM) while COD represents both biodegradable and non-biodegradable OM in water.
What is COD and how it is determined?
A typical determination of the COD is to introduce an excess of the dichromate ion. After the reaction is completed the excess amount of dichromate is measured by titration with ferrous ammonium sulfate. COD is expressed in milligrams per liter (mg/L), which indicates the mass of oxygen consumed per liter of solution.
How do you determine COD in water samples?
Chemical oxygen demand (COD) is used to determine the quantity of pollution in water after wastewater treatment. The higher value of chemical oxygen demand indicates the higher organic pollution in the water sample. Only chemically digest able matter can be determined by the COD test.
How is COD measured in water sample?
This is usually done by titration, using an indicator solution. COD is expressed in mg/L, which indicates the mass of oxygen consumed per liter of solution. The COD test only requires 2-3 hours, while the Biochemical (or Biological) Oxygen Demand (BOD) test requires 5 days.
How can COD and BOD be used to assess water quality?
Like COD, biochemical oxygen demand (BOD) measurement can be used to estimate the amount of pollution in a water sample. COD describes the amount of oxygen required to chemically break down pollutants, while BOD indicates the amount of oxygen required to breakdown organic pollutants biologically with microorganisms.
What does a BOD test measure?
The test for biochemical oxygen demand (BOD) is a bioassay procedure that measures the oxygen consumed by bacteria from the decomposition of organic matter (Sawyer and McCarty, 1978). The change in DO concentration is measured over a given period of time in water samples at a specified temperature.
Why COD measurement is necessary along with BOD test for waste water?
COD is the amount of oxygen required to chemically oxidize organic matter in your wastewater into inorganic matter. whereas BOD is the amount of oxygen required to biologically oxidize the organics in your sample, usually after 5 days or 21 days of incubation time, depending on the bioassay followed.
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