Question 1 Calculation of Chemical Oxygen Demand (COD)

The generic formula for calculating COD for a given organic compound is given below:

\(\text{C}_{n}\text{H}_{a}\text{O}_{b}+\dfrac{4n+a-2b}{4}\text{O}_{2}\rightarrow n\text{CO}_{2}+\dfrac{a}{2}\text{H}_{2}\text{O}\)

a) Explain how the formula for COD is derived

b) A WWTP receives water containing 100 mg/L of glucose (C₆H₁₂O₆), what will be the COD concentration in the influent?