Is there any Mathematical relation between COD and BOD (5 days)?

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Thirojan Jayabalasingham

COD or Chemical Oxygen Demand is the total measurement of all chemicals (organics & in-organics) in the water / waste water;

BOD is a measure of, the amount of oxygen that require for the bacteria to degrade the organic components present in water / waste water.

The ratio of BOD/COD is about; COD is higher than that of BOD; maximum of up to 4 times in medium scale industries; but it varies based on the industrial process and nature of the raw materials used;

Luis Bertello

No mathematical relation. It is very variable according the composition of the sample.

Hawn-Chung Chu

The ratios of BOD to COD are related to the biodegradability of materials.

Mohammad Anwar Hossain

Thank you Thirojan Jayabalasingham, Luis Bertello and Hawn-Chung Chu.

The results of BOD/COD ratio should be got by BOD and COD experiment.

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absorption= 1-mag(S(FP1:1,FP1:1)*S(FP1:1,FP1:1))-mag(S(FP2:1,FP1:1)*S(FP2:1,FP1:1)) is it correct for absorption ?

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what is the simplest definition of ion exchange capacity

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How to compare two groups with only two measurements?

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What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

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Do we need to write protocol for a second study of a systematic review that has been registered and published?

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How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

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absorption= 1-mag(S(FP1:1,FP1:1)S(FP1:1,FP1:1))-mag(S(FP2:1,FP1:1)S(FP2:1,FP1:1)) is it correct for absorption ?