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Why is the theoritical oxygen deman always greater than biochemical oxygen demand?

Why is the theoritical oxygen deman always greater than biochemical oxygen demand?
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Answer #1

Theoretical oxygen demand is the amount of oxygen required to oxidise a compound completely stable oxidation compounds.

Biochemical oxygen demand is the amount of oxygen required for microorganisms to decompose the compound into simple oxidation compounds.the bod is dependent on type of organism and compound to oxidation i.e, the biodegradability of compound.

So,in this phenomenon the thod is fixed and bod depends on the above factors.so the thod is always greater than bod.

Bod = .9Thod - 1

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