| Abstract: | The relationship between the nitrogenous biological oxygen demand (NBOD) and the oxidizable nitrogenous pollutants in the Lee River has been determined to be dependent upon the hydrological conditions. When there is no water discharge (NWD) from the upper reservoir, this relationship is quite clear and definite, but under water discharge (WD) conditions, this relationship is ill-defined. Mean ratios of NBOD5 to BOD5 are 0.620 for the NWD case and 0.379 for the WD case, with maximum ratios of 0.944 and 0.643, respectively. Differences between these two cases are caused mainly by the variations of several factors such as concentration of oxidizable nitrogen compounds, an abundance of nitrifying organisms, pH and velocity and depth of water. The hydrological conditions play an important role in these variations. |
