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What is COD & BOD?
The biochemical oxygen demand (BOD) represents the amount of dissolved oxygen (DO) consumed by biological organisms when they decompose organic matter in water. The chemical oxygen demand (COD) is the amount of oxygen consumed when the water sample is chemically oxidised.
What is the BOD biological oxygen demand and COD chemical oxygen demand of a water sample?
BOD of wastewater effluents is used to indicate the short-term impact on the oxygen levels of the receiving water. BOD analysis is similar in function to chemical oxygen demand (COD) analysis, in that both measure the amount of organic compounds in water.
What are the differences between COD and BOD method?
COD is the amount of oxygen required to chemically breakdown the pollutants whereas BOD is the amount of oxygen required to do this biologically through micro-organisms. Specifically, it measures the equivalent amount of oxygen required to chemically oxidize organic compounds in water thus removing the pollution.
Why is BOD preferred over COD?
COD is normally higher than BOD because more organic compounds can be chemically oxidised than biologically oxidised. This includes the chemical toxics to biological life, which can make COD tests very useful when testing industrial sewage as they will not be captured by BOD testing. Hence, COD is preferred over BOD.
What is biochemical oxygen demand (BOD)?
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. The term also refers to a chemical procedure for determining this amount.
What are the differences between cod and BOD test methods?
June 24, 2020. Emma Atkin. Ask the expert: What are the differences between Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD)? Answer: Both COD and BOD test methods aim to give an indication of the amount of pollution in a water sample. COD is the amount of oxygen required to chemically breakdown the pollutants whereas BOD is
What is the difference between cod and oxygen?
You’ll notice that both these terms contain the word oxygen. That means that when either of them break down in a waterbody, they place a demand on the amount of available… oxygen! They consume it as they decompose or breakdown. COD comes from, you guessed it, chemical sources.
What is chemical oxygen demand (COD) test?
As Wikipedia put it: The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality.