Which one is correct for biological oxygen demand? a. BOD versus time curve can be modelled as a first order rate process up until the point where nitrogeneous oxidation starts to occur. b.BOD is...

Extracted text: Which one is correct for biological oxygen demand? a. BOD versus time curve can be modelled as a first order rate process up until the point where nitrogeneous oxidation starts to occur. b.BOD is equal to the dissolved oxygen concentration of the sample. c. It is an indirect measure of the total phosphate nutrient available that can be utilised by microorganisms. d.lt is a direct measure of the total nitogen nutrient available that can be utilised by microorganisms.